CN110012553B - Session control method, network device and terminal - Google Patents

Abstract

The invention discloses a session control method, a network device and a terminal. The method includes: acquiring operation request information of PDU session information of a packet data unit; and processing the PDU session according to the operation request information. In the present invention, through the cooperation of the terminal, the first network unit and the second network unit, the suspended terminal can resume the PDU session on demand when the connection is resumed, thus saving the resources of the wireless access network and reducing the signaling overhead.

Description

Session control method, network device and terminal

technical field

The present invention relates to the field of communication technologies, and in particular, to a session control method, a network device and a terminal.

Background technique

Cellular Internet of Things (CIOT) is an optimized method for data transfer, including control plane CIOT and user plane CIOT. The user plane CIOT means that when a terminal (User Equipment, UE) needs to be released or is inactive, the context of the terminal can be maintained in the radio access network by suspending the connection between the terminal and the network. When the terminal needs to restore the connection with the network, it is not necessary to re-establish the context of the terminal in the radio access network. , the terminal also does not need to send a service request to the core network, so as to save the signaling of connection establishment and reduce the delay. The connection between the terminal and the network may refer to a radio resource control (Radio Resource Control, RRC) connection between the terminal and the access network, and the connection between the access network and the core network regarding the terminal.

For the terminal using the user plane CIOT, the signaling of the connection establishment in the service request process can be saved and the delay can be reduced when the connection is restored, but for the suspended PDU session, especially the Radio Access Network (RAN) The PDU session suspended on the ) side cannot decide whether to resume and whether to resume the radio bearer according to the will of the terminal. If all PDU sessions are restored by default, restoring the PDU sessions that the terminal does not want to restore wastes the radio resources for establishing radio bearers.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a session control method, a network device, and a terminal, so as to solve the problems of complex signaling and low utilization of infinite resources in a PDU session recovery process in a 5G system.

In a first aspect, an embodiment of the present invention provides a session control method, applied to the first network element side, including:

Obtain the operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: the PDU session information that the terminal requests to resume, the PDU session information that the terminal requests to release, and the PDU session information that the terminal requests to suspend;

PDU session processing is performed according to the operation request information.

In a second aspect, an embodiment of the present invention further provides a network device, applied to the side of the first network unit, including:

The first obtaining module is used to obtain operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: PDU session information requested by the terminal to be restored, PDU session information requested by the terminal to be released, and information of the PDU session requested by the terminal to hang up. PDU session information started;

The first processing module is configured to process the PDU session according to the operation request information.

In a third aspect, an embodiment of the present invention provides a session control method, applied to the first network element side, including:

Obtain the operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: the PDU session information requested by the second network element to be restored, the second network element request to release the PDU session information and the second network element request Pending PDU session information;

PDU session processing is performed according to the operation request information.

In a fourth aspect, an embodiment of the present invention further provides a network device, applied to the side of the first network unit, including:

The second obtaining module is configured to obtain operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: the PDU session information requested by the second network element to be restored, the second network element requesting to release the PDU session information and the second network element requests pending PDU session information;

The second processing module is configured to process the PDU session according to the operation request information.

In a fifth aspect, an embodiment of the present invention provides a session control method, applied to the second network element side, including:

Obtain the operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to be released, PDU session information requested by the terminal to be suspended, PDU session recovery result information of a network element, PDU session information requested by a third network element to resume, information of a PDU session requested by a third network element to release a PDU session, information of a PDU session requested by a third network element to be suspended, and PDUs that require downlink data transmission Session information and PDU session information notified by downlink data;

PDU session processing is performed according to the operation request information.

In a sixth aspect, an embodiment of the present invention provides a network device, applied to the second network unit side, including:

The third obtaining module is used to obtain operation request information of the PDU session information of the packet data unit; the operation request information includes at least one of the following information: PDU session information requested by the terminal to be restored, PDU session information requested by the terminal to be released, and information of the PDU session requested by the terminal to hang up PDU session information started, the PDU session recovery result information of the first network element, the PDU session information requested by the third network element to resume, the PDU session information requested by the third network element to release the PDU session information, the PDU session information requested by the third network element to be suspended, PDU session information that requires downlink data transmission and PDU session information that receives downlink data notification;

The third processing module is configured to process the PDU session according to the operation request information.

In a seventh aspect, an embodiment of the present invention provides a session control method, applied to a terminal side, including:

sending the operation request information of the packet data unit PDU session information to the first network element;

receiving the PDU session operation response information sent by the first network element according to the operation request information;

PDU session processing is performed according to the PDU session operation response information.

In an eighth aspect, an embodiment of the present invention further provides a terminal, including:

a third sending module, configured to send the operation request information of the packet data unit PDU session information to the first network element;

a second receiving module, configured to receive the PDU session operation response information sent by the first network element according to the operation request information;

The fourth processing module is configured to process the PDU session according to the PDU session operation response information.

In a ninth aspect, an embodiment of the present invention provides a network device. The network device includes a processor, a memory, and a computer program stored in the memory and running on the processor. The processor implements the above session control method when the computer program is executed. A step of.

In a tenth aspect, an embodiment of the present invention provides a terminal. The terminal includes a processor, a memory, and a computer program stored in the memory and running on the processor. When the computer program is executed by the processor, the above-mentioned session control method is implemented. step.

In an eleventh aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above session control method are implemented.

In this way, the session control method, network device and terminal of the embodiments of the present invention obtain operation request information of PDU session information of a packet data unit; and perform PDU session processing according to the operation request information. Wherein, the operation request information includes at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to be released, PDU session information requested by the terminal to be suspended, PDU session information requested by the second network element to resume, The second network element requests the release of the PDU session information, and the second network element requests the suspended PDU session information. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings that are used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

FIG. 1 shows one of the schematic flowcharts of a session control method for a first network element in an embodiment of the present invention;

FIG. 2 shows one of the schematic structural diagrams of the modules of the network equipment of the first network unit in the embodiment of the present invention;

FIG. 3 shows the second schematic flowchart of the session control method of the first network element in the embodiment of the present invention;

FIG. 4 shows the second schematic diagram of the module structure of the network device of the first network unit in the embodiment of the present invention;

5 shows a schematic flowchart of a session control method for a second network element in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a module of a network device of a second network unit in an embodiment of the present invention;

FIG. 7 shows a structural block diagram of a network device in an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a session control method of a terminal in an embodiment of the present invention;

FIG. 9 is a schematic diagram of a module structure of a terminal in an embodiment of the present invention;

10 shows a structural block diagram of a terminal in an embodiment of the present invention;

FIG. 11 shows a schematic diagram of a network architecture according to an embodiment of the present invention;

FIG. 12 shows a schematic flowchart of the session control method according to the first embodiment of the present invention;

13 is a schematic flowchart of a session control method according to a second embodiment of the present invention;

14 is a schematic flowchart of a session control method according to a third embodiment of the present invention;

FIG. 15 shows a schematic flowchart of a session control method according to a fourth embodiment of the present invention;

16 is a schematic flowchart of a session control method according to a fifth embodiment of the present invention;

17 is a schematic flowchart of a session control method according to a sixth embodiment of the present invention;

FIG. 18 is a schematic flowchart of a session control method according to a seventh embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.

The terms "first", "second" and the like in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

An embodiment of the present invention provides a session control method, which is applied to the side of a first network unit, where the first network unit includes at least one of the following: a wireless access network device, a wireless access network node, a wireless access network functional unit, a centralized Unit (Centralized Unit, CU), Distributed Unit (Distributed Unit, DU), base station, eNB, gNB, Non-3GPP InterWorking Function (Non-3GPP InterWorking Function, N3IWF), Access Control (Access Controller, AC) node, an access point (Access Point, AP) device or a wireless local area network (Wireless Local Area Networks, WLAN) node; the second network unit includes at least one of the following: a core network device, a core network node, a core network functional unit, a mobility management entity ( Mobility Management Entity, MME), Access Management Function (Access Management Function, AMF), Session Management Function (Session Management Function, SMF), SGW, PGW, User Plane Function UPF. Wherein, the embodiment of the present invention only takes the first network unit as the wireless access network and the second network unit as the core network as an example for description.

It is worth pointing out that in the 5G mobile communication system, the user plane CIOT may be named by other names, but this does not affect the present invention.

In this embodiment of the present invention, suspending/releasing means suspending and/or releasing, and resuming the PDU session may also be embodied as activating the PDU session.

As shown in FIG. 1 , the session control method according to the embodiment of the present invention specifically includes the following steps:

Step 11: Obtain the operation request information of the PDU session information of the packet data unit.

The operation request information may include at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to be released, and PDU session information requested by the terminal to be suspended.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, suspension indication information, release indication information, PDU session identification bitmap information and QoS flow information in the PDU session.

Optionally, the bit position in the PDU session bitmap represents the PDU session identifier (for example, the PDU session identifier represented by the Nth bit is N). The Nth bit position may indicate whether to operate (eg, request to resume, request to release, request to suspend, and to suspend successfully) the PDU session whose PDU session identifier is N. For example, if the Nth bit indicates 1, it may indicate to perform one of the following session operations on the corresponding PDU session: request activation, request resumption, request release, request suspend, confirm resumption, resume success, release success, and suspend success.

For example, if the Nth bit indicates 0, it can indicate to perform one of the following session operations on the corresponding PDU session: request deactivation, request not to resume, request not to release, request not to be suspended, confirmation not to be resumed, resume failure, release failure, suspension failed. It is not difficult to understand that bytes of information that need to be transmitted can be saved by using the PDU session bitmap.

- When the PDU session information requesting recovery contains a PDU session bitmap, the PDU session bitmap may indicate which PDU sessions request the session. For example, the Nth bit may be set to 1 to indicate that the PDU session identified as N is the PDU session request session.

- When the PDU Session information requesting release contains a PDU Session Bitmap, the PDU Session Bitmap may indicate which PDU Sessions request release. For example, the Nth bit may be set to 1 to indicate that the PDU session with the PDU session identifier as N requests to release.

- When the PDU session information requesting suspension contains a PDU session bitmap, the PDU session bitmap may indicate which PDU sessions are requested to be suspended. For example, by setting the Nth bit to 1, it can indicate that the PDU session request with the PDU session identifier N is suspended.

- When the PDU Session Acknowledgment Recovered Information or the PDU Session Acknowledgment Unrecoverable PDU Session contains a PDU Session Bitmap, the PDU Session Bitmap may indicate which PDU Sessions Acknowledgment Recovery and/or which PDU Sessions Acknowledgment Unrecoverable. For example, by setting the Nth bit to 1, it may indicate that the PDU session with the PDU session identifier as N requests the acknowledgment recovery. For example, by setting the Nth bit to 0, it can be indicated that the PDU session with the PDU session identifier as N requests the acknowledgment that the PDU session cannot be recovered.

- When the PDU session recovery result information contains the PDU session bitmap, the PDU session bitmap may indicate which PDU sessions were successfully recovered and/or which PDU sessions confirmed the recovery failure. For example, the Nth bit may be set to 1 to indicate that the PDU session whose PDU session identifier is N is successfully restored. For example, the Nth bit may be set to 0 to indicate that the PDU session with the PDU session identifier as N fails to recover.

Optionally, the PDU session identification information may include QoS flow identification information. The PDU session identification bitmap information may include QoS flow identification bitmap information, and the QoS flow information may include QoS flow mapped radio bearer information. In general, a PDU session can contain multiple QoS flows. As long as there is at least one QoS flow requesting restoration, the PDU session of the corresponding PDU needs to request restoration.

Step 12: Perform PDU session processing according to the operation request information.

In one embodiment, step 12 may include at least one of the following:

When the operation request information is the PDU session information requested by the terminal to resume, at least one of the following may be performed: perform a resume operation on the PDU session requested by the terminal to resume; resume operation on all PDU sessions suspended by the terminal; perform a resume operation on all PDU sessions suspended by the terminal The PDU session is resumed, and when the resources are insufficient, the resume operation is preferentially performed on the PDU session requested by the terminal. Wherein, the resources mentioned here may include various resources such as wireless resources, CPU, and memory inside the first network unit. In one embodiment, priority refers to assuming that the PDU sessions requested by the UE to resume are PDU Session 1 and PDU Session 2, but the PDU sessions suspended by the terminal include PDU Session 1, PDU Session 2, PDU Session 3, and PDU Session 4. and PDU Session 5. The first network unit restores all the resources when the resources are sufficient, but when the resources are insufficient, it restores the PDU session 1 and PDU session 2 first. If there are additional resources after restoring the PDU session 1 and PDU session 2, it can further restore the PDU session 3. , PDU Session 4, etc.

When the operation request information includes the PDU session information requested by the terminal to be released, the release operation may be performed on the PDU session requested by the terminal to be released.

When the operation request information includes the PDU session information requested by the terminal to be suspended, the suspension operation can be performed on the PDU session requested by the terminal to be suspended.

It is worth noting that the steps of restoring the PDU session may be: at least one of the following operations may be performed on the PDU session: restoring the context of the PDU session; restoring the radio bearer corresponding to the PDU session; Flow allocating and/or mapping radio bearer resources; restoring the connection between the first network element and the second network element with respect to the terminal.

Further, step 12 may further include at least one of the following: sending PDU session information confirming restoration and/or acknowledging that cannot be restored to the terminal; sending PDU session restoration result information of the first network element to the second network element. That is to say, 1. The first network unit can also generate PDU session information that confirms the restoration and/or confirms that the restoration cannot be confirmed according to the processing result while or after processing the PDU session, and feeds it back to the terminal; 2. The first network unit While or after the PDU session is processed, a PDU session recovery result of the first network element may be generated according to the processing result and sent to the second network element. The embodiment of the present invention does not limit the sequence relationship between the two steps (above 1 and 2), nor does it limit the sequence relationship between the processing process and the sending of the processing result. send together.

Wherein, the PDU session recovery result information of the first network unit may include at least one of the following information: PDU session information for successful recovery, PDU session information for recovery failure, PDU session information for requesting release, and PDU session information for requesting suspension .

Optionally, the successfully restored PDU session information may be used to indicate that both the terminal and the first network element restore the successful PDU session;

The failed PDU session information can be used to instruct the terminal or the first network element to restore the failed PDU session;

The PDU session information requested to be released may be used to indicate at least one of the PDU session that the terminal fails to recover, the PDU session that the first network element fails to recover, and the PDU session that the terminal requests to release;

The suspended PDU session information may be used to instruct the terminal to resume at least one of the failed PDU session, the first network element to resume the failed PDU session, and the terminal requesting the suspended PDU session;

The resumed PDU session information may be used to indicate at least one of a PDU session in which a PDU session context exists, a PDU session capable of allocating or mapping radio bearer resources, and a PDU session in which both the first network element and the second network element confirm that the resume can be resumed. ;

Confirmation of unrecoverable PDU sessions may include: PDU sessions for which no PDU session context exists, PDU sessions for which radio bearer resources cannot be allocated or mapped, PDU sessions for which the first network element confirms unrecoverable PDUs, and PDUs for which the second network element confirms unrecoverable PDUs At least one item in the session.

Optionally, after the step of confirming the recovery and/or confirming the PDU session information that cannot be recovered to the terminal, the method may further include: receiving PDU recovery result information of the terminal fed back by the terminal. The PDU recovery result information of the terminal may include at least one item of PDU session information on which the terminal recovers successfully and PDU session information on which the terminal fails to recover.

Optionally, the step of sending the PDU session recovery result information of the first network element to the second network element may further include: sending a session operation request carrying the PDU session recovery result information of the first network element to the second network element; receiving The PDU session recovery result information of the second network element returned by the second network element according to the session operation request.

Optionally, the PDU session recovery result information of the second network element may include at least one of the following information: information about a PDU session that is successfully recovered, information about a PDU session that fails to recover, information about a PDU session that requests recovery, and a PDU session that requests release information and request pending PDU session information.

Specifically, the information of the successfully restored PDU session may be used to indicate that both the first network element and the second network element restore the successful PDU session;

The failed PDU session information may be used to instruct the second network element to restore the failed PDU session;

The PDU session information requested by the second network element to resume may be used to indicate a PDU session suspended by the first network element but requested by the second network element to resume, and a PDU session suspended by the first network element without a resume failure but the second network element requests to resume at least one of the PDU sessions;

The PDU session information requested by the second network element to be released may be used to indicate at least one of the PDU session that the second network element fails to recover, and the PDU session that the first network element recovers successfully but the second network element requests to release;

The PDU session information requested by the second network element to be suspended may be used to indicate at least one of a PDU session that the terminal fails to resume and a PDU session that the first network element resumes successfully but the second network element requests to release.

The step of receiving the PDU session recovery result information of the second network unit returned by the second network unit according to the session operation request may further include: processing the PDU session of the terminal according to the PDU session recovery result information of the second network unit. An example is: the first network element restores the PDU sessions 1 and 2 of the terminal, but the second network element successfully restores the PDU session 1 and fails to restore the PDU session 2. At this time, it is not difficult to understand that, for the PDU session 2 that fails to recover, the second network element may indicate that the PDU session 2 fails to recover, request to release the PDU session 2 or request to suspend the PDU session 2.

Optionally, according to the PDU session recovery result information of the second network element, the specific content of the step of processing the PDU session of the terminal is as follows, which will not be repeated here.

In another implementation manner, step 12 may include: when the operation request information includes PDU session information requested by the terminal to be restored, may perform: sending the information of the PDU session requested by the terminal to be restored to the second network element.

Wherein, after the step of sending the PDU session information requested to be restored by the terminal to the second network unit, the step may further include: receiving the PDU session restoration result information of the second network unit fed back by the second network unit according to the PDU session information requested to be restored by the terminal; The PDU session recovery result information of the second network unit can process the PDU session of the terminal.

It is worth pointing out that the above-mentioned PDU session recovery result information of the second network element may include at least one of the following information: PDU session information for which the second network element recovers successfully, PDU session information for which the second network element fails to recover, and a second The PDU session information requested by the network element to resume, the PDU session information requested by the second network element to be released, and the PDU session information requested by the second network element to be suspended.

Specifically, the information of the successfully restored PDU session may be used to indicate that both the first network element and the second network element restore the successful PDU session;

The failed PDU session information may be used to instruct the second network element to restore the failed PDU session;

The PDU session information requested by the second network element to resume may be used to indicate a PDU session suspended by the first network element but requested by the second network element to resume, and a PDU session suspended by the first network element without a resume failure but the second network element requests to resume at least one of the PDU sessions;

The PDU session information requested by the second network element to be released may be used to indicate at least one of the PDU session that the second network element fails to recover, and the PDU session that the first network element recovers successfully but the second network element requests to release;

The PDU session information requested by the second network element to be suspended may be used to indicate at least one of a PDU session that the terminal fails to resume and a PDU session that the first network element resumes successfully but the second network element requests to release.

An example is: the first network element restores the PDU sessions 1, 2, and 3 of the terminal and it is the PDU session 1 that the terminal requests to restore. The second network element successfully recovers the PDU session 1 requested by the terminal. At the same time, the second network unit finds the PDU session 2 that needs downlink data transmission, and fails to recover the PDU session 2 successfully. At this time, it is not difficult to understand that for the redundant restored PDU session 3, the second network element may instruct to request to release the PDU session 3 or to request to suspend the PDU session 3.

Another example is: the first network element sends a terminal request to resume PDU session 1 to the second network element. The second network element successfully recovers the PDU session 1 requested by the terminal. At the same time, the second network unit finds the PDU session 2 that needs downlink data transmission, and fails to recover the PDU session 2 successfully. At this time, it is not difficult to understand that for the redundant restored PDU session 3, the second network unit may indicate that the restored PDU sessions 1 and 2 are successful and send them to the first network unit. The first network element then resumes PDU sessions 1 and 2 correspondingly. The first network element also instructs the UE to resume PDU sessions 1 and 2.

According to the PDU session recovery result information of the second network element, the step of processing the PDU session of the terminal may include:

If the PDU session recovery result information of the second network element is the PDU session information of the successful recovery of the second network element, at least one of the following operations may be performed on the PDU session of the second network element that has been successfully recovered:

The PDU session indicated by the successfully restored PDU session information by the second network unit has not been restored, and the PDU session may be restored by performing the restoration operation on the PDU session (the restoration operation on the PDU session is as above, and will not be repeated here);

When it is detected that the PDU session successfully restored by the second network unit cannot be restored on the first network unit or the terminal side, request information for requesting to release or suspend the PDU session may be sent to the second network unit;

If the PDU session recovery result information of the second network element is the information of the PDU session that the second network element fails to recover, at least one of the following operations may be performed on the PDU session that the second network element fails to recover:

Suspend the second network element to restore the failed PDU session context,

Suspend the context of the radio bearer corresponding to the failed PDU session recovery by the second network element,

releasing the bearer resources corresponding to the failed PDU session by the second network element,

save the uplink transport address of the PDU session that the second network unit fails to recover,

Set the PDU session status of the second network element that fails to recover to suspended,

requesting the terminal to suspend the second network element to resume the failed PDU session,

requesting the terminal to delete the PDU session context for which the second network element fails to recover,

requesting the terminal to delete the PDU session that the second network element fails to restore;

If the PDU session restoration result information of the second network unit is the PDU session information requested by the second network unit to be restored, at least one of the following operations may be performed on the PDU session requested by the second network unit to be restored:

restoring the context of the PDU session requested by the second network element to be restored,

restoring the radio bearer corresponding to the PDU session requested by the second network element to be restored,

allocating or mapping radio bearer resources for the PDU session requested by the second network element to resume,

restoring the connection with the second network element about the terminal;

If the PDU session recovery result information of the second network element is the PDU session information requested by the second network element to be released, at least one of the following operations may be performed on the PDU session requested by the second network element to be released:

release the context of the PDU session requested by the second network element to be released,

releasing the radio bearer context corresponding to the PDU session requested by the second network element to be released,

releasing the radio bearer resources corresponding to the PDU session requested by the second network element to be released,

sending the PDU session information requested by the second network element to be released to the terminal;

If the PDU session recovery result information of the second network element is information of the PDU session requested by the second network element to be suspended, at least one of the following operations may be performed on the PDU session requested by the second network element to be suspended:

Suspend the context of the second network element requesting the suspended PDU session,

Suspend the radio bearer context corresponding to the suspended PDU session requested by the second network element,

releasing the radio bearer resource corresponding to the PDU session requested by the second network element to be suspended,

Sending the PDU session information requested by the second network element to the terminal to be suspended.

In another embodiment, step 12 may include at least one of the following:

When the operation request information includes the PDU session information requested by the second network element to be restored, at least one of the following may be performed: sending the acquired PDU session information of the second network element requested to be restored to the terminal;

The first network unit may include at least one of the following: radio access network equipment, radio access network nodes, radio access network functional units, centralized unit CU, distributed unit DU, base station, eNB, gNB, N3IWF, access control Node AC, access point AP device or wireless local area network WLAN node.

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, MME, AMF, SMF, SGW, PGW, and user plane function UPF.

The specific operation flow of the first network unit in the session control method has been described above, which will be further described in this embodiment below with reference to specific scenarios.

scene one,

The first network unit performs PDU session processing according to the PDU session information requested by the terminal to resume, release and/or suspend.

Example one,

The first network unit acquires operation request information of the PDU session information, and performs PDU session processing according to the operation request information. Wherein, the operation request information may include: PDU session information requested by the terminal to resume, release and/or suspend.

Specifically, the first network unit may obtain PDU session information requested by the terminal to resume, release and/or suspend by receiving a Radio Resource Control (RRC) resume request (ie, operation request information) sent by the terminal.

When the RRC restoration request carries the PDU session information requested by the terminal to be restored, the first network element may perform a restoration operation on the PDU session requested by the terminal to be restored.

When the RRC recovery request carries the information of the PDU session requested by the terminal to be released, the release operation may be performed on the PDU session requested by the terminal to be released.

When the RRC resume request carries the information of the PDU session requested by the terminal to be suspended, the suspension operation can be performed on the PDU session requested by the terminal to be suspended.

During the process of resuming, releasing and suspending the PDU session requested by the terminal to resume, the first network unit may also generate, according to the processing result, information about the PDU session that confirms the resume and/or confirms that the resume cannot be resumed, and the PDU session of the first network element. Restore at least one item of result information. Wherein, the first network unit may send the PDU session information for confirming the recovery and/or confirming that the recovery cannot be confirmed to the terminal, and after sending the PDU session information for confirming the recovery and/or confirming that the recovery cannot be confirmed to the terminal, it can receive the PDU recovery of the terminal fed back by the terminal. result information. Further, the first network element may also send the PDU session recovery result information of the first network element to the second network element, and specifically send a session operation request carrying the PDU session recovery result information of the first network element to the second network element; After the session operation request is sent, the PDU session recovery result information of the second network element returned by the second network element according to the session operation request can also be received, and then the PDU session recovery result information of the terminal is performed according to the PDU session recovery result information of the second network element. deal with. It is worth noting that, the embodiment of the present invention does not limit the sequence relationship of the two steps.

Further, the PDU session recovery result information of the second network element may include at least one of the following information: PDU session information for which the second network element recovers successfully, information for a PDU session for which the second network element fails to recover, and a second network element request The resumed PDU session information, the PDU session information requested by the second network element to be released, and the PDU session information requested by the second network element to be suspended. The step of processing the PDU session of the terminal by the first network unit according to the PDU session recovery result information of the second network unit may be implemented with reference to the following manner:

If the PDU session recovery result information of the second network unit is the PDU session information of the successful recovery of the second network unit, when it is detected that the PDU session successfully recovered by the second network unit cannot be recovered on the side of the first network unit or the terminal, the 2. The network unit sends request information for requesting to release or suspend the PDU session;

If the PDU session recovery result information of the second network element is the information of the PDU session that the second network element fails to recover, at least one of the following operations may be performed for the PDU session that the second network element fails to recover:

Suspend the second network element to restore the failed PDU session context,

Suspend the context of the radio bearer corresponding to the failed PDU session recovery by the second network element,

releasing the bearer resources corresponding to the failed PDU session by the second network element,

save the uplink transport address of the PDU session that the second network unit fails to recover,

Set the PDU session status of the second network element that fails to recover to suspended,

requesting the terminal to suspend the second network element to resume the failed PDU session,

requesting the terminal to delete the PDU session context for which the second network element fails to recover,

requesting the terminal to delete the PDU session that the second network element fails to restore;

If the PDU session restoration result information of the second network unit is the PDU session information requested by the second network unit to be restored, at least one of the following operations may be performed on the PDU session requested by the second network unit to be restored:

restoring the context of the PDU session requested by the second network element to be restored,

restoring the radio bearer corresponding to the PDU session requested by the second network element to be restored,

allocating or mapping radio bearer resources for the PDU session requested by the second network element to resume,

restoring the connection with the second network element about the terminal;

If the PDU session recovery result information of the second network element is the PDU session information requested by the second network element to be released, at least one of the following operations may be performed on the PDU session requested by the second network element to be released:

release the context of the PDU session requested by the second network element to be released,

releasing the radio bearer context corresponding to the PDU session requested by the second network element to be released,

releasing the radio bearer resources corresponding to the PDU session requested by the second network element to be released,

sending the PDU session information requested by the second network element to be released to the terminal;

If the PDU session recovery result information of the second network unit is the information of the PDU session requested by the second network unit to be suspended, at least one of the following operations may be performed on the PDU session requested by the second network unit to be suspended:

Suspend the context of the second network element requesting the suspended PDU session,

Suspend the radio bearer context corresponding to the suspended PDU session requested by the second network element,

releasing the radio bearer resource corresponding to the PDU session requested by the second network element to be suspended,

Sending the PDU session information requested by the second network element to the terminal to be suspended.

Example two,

Different from Example 1, when the RRC resume request carries the PDU session information that the terminal requests to resume, the first network element may perform a resume operation on all PDU sessions suspended by the terminal.

Example three,

Different from example 2, this example considers system resources. Specifically, when the RRC recovery request carries the PDU session information that the terminal requests to resume, the first network element can perform a resume operation on all PDU sessions suspended by the terminal and When the resources are insufficient, the recovery operation is preferentially performed on the PDU session requested by the terminal for recovery.

scene two,

Different from scenario 1, after receiving the operation request information sent by the terminal, the first network unit can directly forward the operation request information to the second network unit, and receive the feedback of the PDU session information restored by the second network unit according to the terminal request. The PDU session recovery result information of the second network element; according to the PDU session recovery result information of the second network element, the PDU session of the terminal can be processed.

In the session control method of the embodiment of the present invention, the first network unit obtains operation request information of the PDU session information of the packet data unit; according to the operation request information, the PDU session processing can be performed. The operation request information may include at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to be released, and PDU session information requested by the terminal to be suspended. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

The above embodiments respectively introduce the session control methods in different scenarios in detail, and the corresponding network devices will be further described in this embodiment below with reference to the accompanying drawings.

As shown in FIG. 2 , the network device 200 in the embodiment of the present invention can realize the operation request information for obtaining the PDU session information of the packet data unit in the above-mentioned embodiment, and according to the operation request information, perform the details of the PDU session processing method, and achieve the same Effectively, the network device 200 may include the following functional modules:

The first obtaining module 210 is configured to obtain operation request information of the PDU session information of the packet data unit; the operation request information may include at least one of the following information: PDU session information requested by the terminal to be restored, PDU session information requested by the terminal to be released, and information of the PDU session requested by the terminal Request pending PDU session information;

The first processing module 220 may be configured to perform PDU session processing according to the operation request information.

Wherein, the first processing module 220 may include:

The first processing submodule can be configured to perform at least one of the following when the operation request information is the PDU session information requested by the terminal to resume: perform a resume operation on the PDU session requested by the terminal to resume; resume all PDU sessions suspended by the terminal operation; and perform recovery operations on all PDU sessions suspended by the terminal and, when resources are insufficient, give priority to recovery operations on the PDU sessions requested by the terminal for recovery;

The second processing submodule can be used to release the PDU session requested by the terminal when the operation request information is the PDU session information requested by the terminal to release;

The third processing submodule may be configured to perform a suspend operation on the PDU session requested by the terminal to be suspended when the operation request information is the information of the PDU session requested by the terminal to be suspended.

Among them, the recovery operation of the PDU session can be:

Do at least one of the following on the PDU session:

restore the context of the PDU session;

Restore the radio bearer corresponding to the PDU session;

Allocate and/or map radio bearer resources for QoS flows of PDU sessions;

The connection with respect to the terminal between the first network element and the second network element is restored.

Wherein, the first processing module may also include at least one of the following:

The first sending submodule can be used to send the PDU session information that confirms the recovery and/or confirms that the recovery cannot be performed to the terminal;

as well as,

The second sending submodule may be configured to send the PDU session recovery result information of the first network element to the second network element; wherein, the PDU session recovery result information of the first network element may include at least one of the following information: recovery is successful PDU session information, PDU session information that fails to resume, PDU session information for requesting release, and PDU session information for requesting suspension.

Wherein, the information of the successfully restored PDU session may be used to indicate that both the terminal and the first network element restore the successful PDU session;

The failed PDU session information can be used to instruct the terminal or the first network element to restore the failed PDU session;

The PDU session information requested to be released may be used to indicate at least one of the PDU session that the terminal fails to recover, the PDU session that the first network element fails to recover, and the PDU session that the terminal requests to release;

The suspended PDU session information may be used to instruct the terminal to resume at least one of the failed PDU session, the first network element to resume the failed PDU session, and the terminal requesting the suspended PDU session;

The resumed PDU session information may be used to indicate at least one of a PDU session in which a PDU session context exists, a PDU session capable of allocating or mapping radio bearer resources, and a PDU session in which both the first network element and the second network element confirm that the resume can be resumed. ;

Confirmation of unrecoverable PDU sessions may include: PDU sessions for which no PDU session context exists, PDU sessions for which radio bearer resources cannot be allocated or mapped, PDU sessions for which the first network element confirms unrecoverable PDUs, and PDUs for which the second network element confirms unrecoverable PDUs At least one item in the session.

Wherein, the first processing module may also include:

The first receiving sub-module can be used to receive the PDU recovery result information of the terminal fed back by the terminal; wherein, the PDU recovery result information of the terminal may include: at least one of PDU session information on which the terminal recovers successfully and PDU session information on which the terminal fails to recover item.

Wherein, the second sending sub-module may include:

a first sending unit, which can be configured to send a session operation request carrying the PDU session recovery result information of the first network unit to the second network unit;

The first receiving unit may be configured to receive the PDU session recovery result information of the second network unit returned by the second network unit according to the session operation request.

Wherein, the first processing module may also include:

The processing submodule may be configured to process the PDU session of the terminal according to the PDU session recovery result information of the second network unit.

Wherein, the first processing module may include:

The fourth processing submodule may be configured to, when the operation request information includes the PDU session information requested by the terminal to be restored, may perform: sending the information of the PDU session requested by the terminal to be restored to the second network unit.

Wherein, the first processing module may also include:

The second receiving submodule may be configured to receive the PDU session restoration result information of the second network unit fed back by the second network unit according to the PDU session information requested by the terminal to restore;

The processing submodule may be configured to process the PDU session of the terminal according to the PDU session recovery result information of the second network unit.

Wherein, the PDU session recovery result information of the second network element may include at least one of the following information: information about the PDU session that the second network element successfully recovers, information about the PDU session that the second network element fails to recover, and the second network element requests recovery PDU session information, the PDU session information requested by the second network element to be released, and the PDU session information requested by the second network element to be suspended.

Wherein, the processing sub-module may include:

The first processing unit may be configured to, if the PDU session recovery result information of the second network element is the PDU session information of the successful recovery of the second network element, when it is detected that the PDU session successfully recovered by the second network element cannot be performed in the first network element or the first network element. When the terminal side recovers, send request information requesting to release or suspend the PDU session to the second network unit;

The second processing unit can be configured to perform at least one of the following operations on the PDU session of the second network element that fails to recover if the PDU session recovery result information of the second network element is the information of the PDU session that the second network element fails to recover :

Suspend the second network element to restore the failed PDU session context,

Suspend the context of the radio bearer corresponding to the failed PDU session recovery by the second network element,

releasing the bearer resources corresponding to the failed PDU session by the second network element,

save the uplink transport address of the PDU session that the second network unit fails to recover,

Set the PDU session status of the second network element that fails to recover to suspended,

requesting the terminal to suspend the second network element to resume the failed PDU session,

requesting the terminal to delete the PDU session context for which the second network element fails to recover,

requesting the terminal to delete the PDU session that the second network element fails to restore;

The third processing unit may be configured to perform at least one of the following operations on the PDU session requested by the second network unit if the PDU session restoration result information of the second network unit is the information of the PDU session requested by the second network unit to be restored :

restoring the context of the PDU session requested by the second network element to be restored,

restoring the radio bearer corresponding to the PDU session requested by the second network element to be restored,

allocating or mapping radio bearer resources for the PDU session requested by the second network element to resume,

restoring the connection with the second network element about the terminal;

The fourth processing unit can be used to perform at least one of the following operations on the PDU session requested by the second network unit if the PDU session recovery result information of the second network unit is the PDU session information requested by the second network unit to be released :

release the context of the PDU session requested by the second network element to be released,

releasing the radio bearer context corresponding to the PDU session requested by the second network element to be released,

releasing the radio bearer resources corresponding to the PDU session requested by the second network element to be released,

sending the PDU session information requested by the second network element to be released to the terminal;

The fifth processing unit may be configured to perform at least one of the following operations on the PDU session requested by the second network unit to be suspended if the PDU session recovery result information of the second network unit is information of the PDU session requested by the second network unit to be suspended One:

Suspend the context of the second network element requesting the suspended PDU session,

Suspend the radio bearer context corresponding to the suspended PDU session requested by the second network element,

releasing the radio bearer resources corresponding to the PDU session requested by the second network element to be suspended,

Sending the PDU session information requested by the second network element to the terminal to be suspended.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, suspension indication information, release indication information, PDU session identification bitmap information and QoS flow information in the PDU session.

The first network unit may include at least one of the following: a radio access network device, a radio access network node, a radio access network functional unit, a centralized unit CU, a distributed unit DU, a base station, a non-3GPP interoperability function N3IWF, Access control node AC, access point AP device or wireless local area network WLAN node;

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, SGW, PGW, user plane function UPF.

It is worth noting that the network device in the embodiment of the present invention obtains the operation request information of the PDU session information of the packet data unit; and performs PDU session processing according to the operation request information. The operation request information may include at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to be released, and PDU session information requested by the terminal to be suspended. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

In another embodiment, the session control method is applied to the first network unit, as shown in FIG. 3 , and further includes the following steps:

Step 31: Obtain the operation request information of the PDU session information of the packet data unit.

The operation request information may include at least one of the following information: PDU session information requested by the second network element to be resumed, information of a PDU session requested by the second network element to be released, and information of a PDU session requested by the second network element to be suspended.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, suspension indication information, release indication information, PDU session identification bitmap information and QoS flow information in the PDU session.

Optionally, the bit position in the PDU session bitmap may represent the PDU session identifier (for example, the PDU session identifier represented by the Nth bit is N). The Nth bit position may indicate whether to operate (eg, request to resume, request to release, request to suspend, and to suspend successfully) the PDU session whose PDU session identifier is N. For example, if the Nth bit indicates 1, it may indicate to perform one of the following session operations on the corresponding PDU session: request activation, request resumption, request release, request suspend, confirm resumption, resume success, release success, and suspend success.

For example, if the Nth bit indicates 0, it can indicate to perform one of the following session operations on the corresponding PDU session: request deactivation, request not to resume, request not to release, request not to be suspended, confirmation not to be resumed, resume failure, release failure, suspension failed. It is not difficult to understand that bytes of information that need to be transmitted can be saved by using the PDU session bitmap.

- When the PDU session information requesting recovery contains a PDU session bitmap, the PDU session bitmap may indicate which PDU sessions request the session. For example, the Nth bit may be set to 1 to indicate that the PDU session identified as N is the PDU session request session.

- When the PDU Session information requesting release contains a PDU Session Bitmap, the PDU Session Bitmap may indicate which PDU Sessions request release. For example, the Nth bit may be set to 1 to indicate that the PDU session with the PDU session identifier as N requests to release.

- When the PDU session information requesting suspension contains a PDU session bitmap, the PDU session bitmap may indicate which PDU sessions are requested to be suspended. For example, by setting the Nth bit to 1, it can indicate that the PDU session request with the PDU session identifier N is suspended.

- When the PDU Session Acknowledgment Recovered Information or the PDU Session Acknowledgment Unrecoverable PDU Session contains a PDU Session Bitmap, the PDU Session Bitmap may indicate which PDU Sessions Acknowledgment Recovery and/or which PDU Sessions Acknowledgment Unrecoverable. For example, by setting the Nth bit to 1, it may indicate that the PDU session with the PDU session identifier as N requests the acknowledgment recovery. For example, by setting the Nth bit to 0, it can be indicated that the PDU session with the PDU session identifier as N requests the acknowledgment that the PDU session cannot be recovered.

- When the PDU session recovery result information contains the PDU session bitmap, the PDU session bitmap may indicate which PDU sessions were successfully recovered and/or which PDU sessions confirmed the recovery failure. For example, the Nth bit may be set to 1 to indicate that the PDU session whose PDU session identifier is N is successfully restored. For example, the Nth bit may be set to 0 to indicate that the PDU session with the PDU session identifier as N fails to recover.

Optionally, the PDU session information may include at least one of the following information: QoS flow identification information, resume indication information, suspension indication information, release indication information, QoS flow identification bitmap information, and QoS flow mapped radio bearer information. In general, a PDU session can contain multiple QoS flows. As long as there is at least one QoS flow requesting restoration, the PDU session of the corresponding PDU needs to request restoration.

Step 32: Perform PDU session processing according to the operation request information.

In one embodiment, step 32 may include at least one of the following:

When the operation request information includes the PDU session information requested by the second network unit to be restored, a restoration operation may be performed on the PDU session requested by the second network unit to be restored;

When the operation request information includes the PDU session information requested by the second network element to be released, the release operation can be performed on the PDU session requested by the second network element to be released;

When the operation request information includes the information of the PDU session requested by the second network unit to be suspended, a suspension operation may be performed on the PDU session requested by the second network unit to be suspended.

It is worth noting that the steps of restoring the PDU session may be: at least one of the following operations may be performed on the PDU session: restoring the context of the PDU session; restoring the radio bearer corresponding to the PDU session; Flow allocating and/or mapping radio bearer resources; restoring the connection between the first network element and the second network element with respect to the terminal.

Optionally, step 32 may further include: sending operation request information to the terminal. In one embodiment, when the operation request information includes PDU session information requested by the second network element to be restored, at least one of the following may be performed: sending the PDU session information requested by the second network element to be restored to the terminal; when the operation request information includes When the second network element requests the released PDU session information, at least one of the following may be performed: sending the second network element request to release the PDU session information to the terminal; when the operation request information includes the PDU session information requested by the second network element to be suspended, At least one of the following may be performed: sending PDU session information requested by the second network element to be suspended to the terminal.

Optionally, step 31 may be: receiving a paging message or a notification message sent by the second network element. The operation request information is carried in the paging message or the notification message. Sending the operation request information to the terminal may be: sending the received paging message or notification message to the terminal;

The paging message or the notification message may carry at least one item of information indicating the PDU session requested by the second network element to be resumed, the information of the PDU session requested by the second network element to be released, and the information of the PDU session requested by the second network element to be suspended .

scene three,

Different from scenario 1 and scenario 2, the first network unit may process the PDU session according to the PDU session information requested by the second network unit to resume, release and/or suspend.

Specifically, the first network element may receive a paging message or a notification message (ie, operation request information) sent by the second network element, and send the received paging message or notification message to the terminal. The paging message or the notification message may carry at least one item of PDU session information indicating that the second network element requests to resume, the second network element to request to release the PDU session, and the second network element to request to suspend the PDU session information.

When the paging message or the notification message includes the PDU session information requested by the second network element to be restored, at least one of the following may be performed: sending the PDU session information requested by the second network element to be restored to the terminal;

When the paging message or the notification message includes the PDU session information requested by the second network element to be released, at least one of the following may be performed: sending the second network element request to release the PDU session information to the terminal

When the paging message or the notification message includes the PDU session information requested by the second network element to be suspended, at least one of the following may be performed: sending the PDU session information requested by the second network element to be suspended to the terminal.

Among them, it is worth noting that, in the first and second scenarios, the step of performing the recovery operation on the PDU session is to perform at least one of the following operations on the PDU session: recovering the context of the PDU session; recovering the radio bearer corresponding to the PDU session; Allocating and/or mapping radio bearer resources for the QoS flow of the PDU session; restoring the connection between the first network element and the second network element with respect to the terminal.

The step of suspending the PDU session is to perform at least one of the following operations on the PDU session: suspending the context of the PDU session, suspending the radio bearer context corresponding to the PDU session, releasing the radio bearer resources corresponding to the PDU session, sending The terminal sends PDU session information.

The step of releasing the PDU session is to perform at least one of the following operations on the PDU session: release the context of the PDU session, release the radio bearer context corresponding to the PDU session, release the radio bearer resources corresponding to the PDU session, and send the PDU to the terminal. session information.

In the session control method of the embodiment of the present invention, the first network unit may obtain operation request information of the PDU session information of the packet data unit; and may perform PDU session processing according to the operation request information. The operation request information may include at least one of the following information: PDU session information requested by the second network element to be resumed, information of a PDU session requested by the second network element to be released, and information of a PDU session requested by the second network element to be suspended. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

The above embodiments respectively introduce the session control methods in different scenarios in detail, and the corresponding network devices will be further described in this embodiment below with reference to the accompanying drawings.

As shown in FIG. 4 , the network device 400 in the embodiment of the present invention can realize the operation request information for obtaining the PDU session information of the packet data unit in the above-mentioned embodiment, and according to the operation request information, perform the details of the PDU session processing method, and achieve the same Effectively, the network device 400 may include the following functional modules:

The second obtaining module 410 is configured to obtain operation request information of the PDU session information of the packet data unit; the operation request information may include at least one of the following information: PDU session information requested by the second network element to be restored, and release requested by the second network element PDU session information, information about the PDU session requested by the second network element to be suspended;

The second processing module 420 is configured to perform PDU session processing according to the operation request information.

Wherein, the second processing module 420 may include at least one of the following:

a fifth processing sub-module, which can be configured to perform a restoration operation on the PDU session requested by the second network unit when the operation request information is the PDU session information requested by the second network unit to be restored;

The sixth processing submodule can be used to release the PDU session requested by the second network element when the operation request information is the PDU session information requested by the second network element to be released;

The seventh processing submodule may be configured to perform a suspend operation on the PDU session requested by the second network unit to be suspended when the operation request information is the information of the suspended PDU session requested by the second network unit.

Wherein, the second processing module 420 may further include:

The third sending submodule is used for sending operation request information to the terminal.

Optionally, the second obtaining module 410 may further perform: receiving a paging message or a notification message sent by the second network element;

The third sending submodule may also perform: sending the received paging message or notification message to the terminal;

The paging message or the notification message may carry at least one item of information indicating the PDU session requested by the second network element to be resumed, the information of the PDU session requested by the second network element to be released, and the information of the PDU session requested by the second network element to be suspended .

In the network device of the embodiment of the present invention, the first network unit obtains operation request information of the PDU session information of the packet data unit; according to the operation request information, the PDU session processing can be performed. The operation request information may include at least one of the following information: PDU session information requested by the second network element to be resumed, information of a PDU session requested by the second network element to be released, and information of a PDU session requested by the second network element to be suspended. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

The above embodiment introduces the session control method of the present invention from the side of the first network element. The following embodiment will further introduce the session control method of the second network element side with reference to the accompanying drawings.

An embodiment of the present invention provides a session control method, which is applied to the side of a second network element. The first network element may include at least one of the following: a wireless access network device, a wireless access network node, a wireless access network functional unit, Centralized unit CU, distributed unit DU, base station, eNB, gNB, non-3GPP interoperability function N3IWF, access control AC node, access point AP device or wireless local area network WLAN node; the second network unit may include at least one of the following: Core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, and user plane function UPF. The third network unit includes at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane function UPF. Wherein, the embodiment of the present invention is only described by taking the first network unit as the wireless access network and the second network unit as the AMF and the SMF in the core network as an example. For example, when the second network element is an MME, the third network element may be an SGW. When the second network element is an AMF, the third network element may be an SMF. When the second network element is an SGW, the third network element may be a PGW. When the second network element is an SMF, the third network element may be a UPF.

As shown in FIG. 5 , the session control method according to the embodiment of the present invention may include the following steps:

Step 51: Obtain the operation request information of the PDU session information of the packet data unit.

The operation request information may include at least one of the following information: PDU session information requested by the terminal to be resumed, PDU session information requested by the terminal to be released, information of the PDU session requested by the terminal to be suspended, and PDU session restoration result information of the first network element , PDU session information requested by the third network element to resume, PDU session information requested by the third network element to be released, PDU session information requested by the third network element to be suspended, PDU session information with downlink data transmission requirements, and downlink data notification PDU session information.

Optionally, the PDU session restoration result information of the first network element may include: at least one of PDU session information that is successfully restored, information that fails to restore, PDU session information that requests release, and information that requests suspend PDU sessions. ;

The PDU session information that the terminal requests to restore may be the PDU session information that the terminal requests to restore and is forwarded by the first network element or sent by the terminal; It is sent to the second network unit through interface messages such as S1/NG. Or, for example, the terminal directly requests the restored PDU session information through a NAS message.

The PDU session information that the terminal requests to release may be the PDU session information that the terminal requests to release and is forwarded by the first network element or sent by the terminal;

The PDU session information requested by the terminal to be suspended may be PDU session information forwarded by the first network element or sent by the terminal and requested to be resumed by the terminal.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, suspension indication information, release indication information, PDU session identification bitmap information and QoS flow information in the PDU session.

Step 52: Perform PDU session processing according to the operation request information.

In one embodiment, step 52 may include at least one of the following:

For a PDU session that needs to be restored, you can perform at least one of the following operations:

restore the context of the corresponding PDU session,

Send the downlink transmission address of the corresponding PDU session to the user plane functional entity, and activate the corresponding PDU session to the user plane functional entity;

Wherein, the PDU session that needs to be restored may include: a PDU session indicated by the PDU session restoration result information of the first network unit that is successfully restored, a PDU session indicated by the PDU session information requested by the terminal to be restored, and a PDU session requested by the third network unit to be restored. The PDU session indicated by the information, the PDU session indicated by the PDU session information with downlink data transmission requirements, the PDU session indicated by the PDU session information received the downlink data notification, the PDU session recovery result information of the first network element indicates that the recovery is successful and the third The PDU session requested by the network element to be restored, the PDU session restoration result information of the first network element indicates that the restoration is successful and the PDU session information indicates that there is a downlink data transmission requirement, and the PDU session restoration result information of the first network element indicates that the restoration is successful and At least one of the PDU session indicated by the PDU session information notified by the downlink data and the PDU session that the terminal requests to restore and the PDU session restoration result information of the first network element indicates that the restoration is successful.

For at least one of the PDU session indicated by the PDU session information requested by the terminal to be released and the PDU session indicated by the first network element requesting to release the PDU session information, the following operations may be performed: releasing the PDU requested by the terminal and/or the second network element to be released session.

For at least one of the PDU session indicated by the PDU session information that the terminal requests to suspend and the first network element to request to suspend the PDU session indicated by the PDU session information, the following operations may be performed: suspend the terminal and/or the second network element requesting Release the PDU session.

For the failed PDU session indicated by the PDU session restoration result information of the first network element, at least one of the following operations may be performed:

Suspend to resume the context of a failed PDU session,

Delete the context of the failed PDU session,

Request the user plane function to delete the failed PDU session.

Optionally, after step 52, it can also include:

Generate PDU session recovery result information of the second network element, and send the PDU session recovery result information of the second network element to the first network element and/or to the terminal through the first network element. Wherein, the PDU session recovery result information of the second network element may include at least one of the following information: information about the PDU session that the second network element successfully recovers, information about the PDU session that the second network element fails to recover, and the second network element requests recovery PDU session information, the PDU session information requested by the second network element to be released, and the PDU session information requested by the second network element to be suspended;

Specifically, the PDU session information requested to be restored by the second network may include at least one of: PDU session information required for downlink data transmission, a PDU session that has received a downlink data notification, and a PDU session requested by the third network element to be restored;

The PDU session information requested by the second network to be suspended may include: a PDU session that the second network fails to recover, a PDU session that the first network element recovers successfully but the second network fails to recover, the first network element and the terminal recover successfully but the second network recover at least one of the failed PDU sessions;

The PDU session information requested by the second network to be released may include: a PDU session that the second network fails to recover, a PDU session that the first network element recovers successfully but the second network fails to recover, the first network element and the terminal recover successfully but the second network recovers At least one of the failed PDU sessions.

In one embodiment, step 52 may include: when the operation request information is the PDU session information requested by the third network element to resume, the information of the PDU session requested by the third network element to release the PDU, and the information of the PDU session requested by the third network element to be suspended , when there is at least one of the PDU session information required for downlink data transmission and the PDU session information notified by the downlink data, the PDU that the third network element requests to restore can be sent to the first network element through a paging request or a notification message The session information is at least one of the PDU session information requested by the third network element to be released, the PDU session information requested by the third network element to be suspended, the PDU session information that has downlink data transmission requirements, and the PDU session information that has received downlink data notification.

The specific operation flow of the second network unit in the session control method has been described above, which will be further described in this embodiment below with reference to specific scenarios.

scene four,

Corresponding to the above scenario 1, the first network unit obtains the PDU session information requested by the terminal to resume, release and/or suspend by receiving a radio resource control (RadioResource Control, RRC) resume request (that is, operation request information) sent by the terminal, and to The corresponding PDU session is resumed, released and/or suspended. In the process of resuming, releasing and suspending the PDU session requested by the terminal to resume, the first network element may also send the PDU session resumption result information of the first network element to the second network element (such as AMF) according to the processing result. . The PDU session recovery result information of the first network element may include at least one of the following information: terminal request recovery, release and/or suspended PDU session information, recovery successful PDU session information, recovery failed PDU session information, request Released PDU session information and request pending PDU session information. In addition, the second network unit may also obtain the PDU session information requested by the third network unit (such as SMF, user plane function, etc.) to resume, release and/or suspend, as well as the PDU session information and/or reception request for downlink data transmission PDU session information to downlink data notification.

After acquiring the above-mentioned PDU session information to be processed, the second network unit (such as SMF) may perform the following operations:

For the PDU sessions that need to be restored, such as the PDU session restoration result information of the first network element indicates the PDU session that has been successfully restored, the PDU session that the terminal requests to restore is indicated, and the third network element that the PDU session information indicates that the restoration is requested to be restored. The PDU session indicated by the PDU session information that has the downlink data transmission requirement, the PDU session indicated by the PDU session information that has received the downlink data notification, the PDU session recovery result information of the first network element indicates that the recovery is successful and the third network element The PDU session requesting restoration, the PDU session restoration result information of the first network element indicating that the restoration is successful and the PDU session information indicating the downlink data transmission requirement indicates the PDU session, and the PDU session restoration result information of the first network element indicating that the restoration is successful and receiving At least one of the PDU session indicated by the PDU session information notified by the downlink data and the PDU session that the terminal requests to restore and the PDU session restoration result information of the first network element indicates that the restoration is successful, at least one of the following operations may be performed:

restore the context of the corresponding PDU session,

Send the downlink transmission address of the corresponding PDU session to the user plane functional entity, and activate the corresponding PDU session to the user plane functional entity;

For at least one of the PDU session indicated by the PDU session information requested by the terminal to be released and the PDU session indicated by the first network element requesting to release the PDU session information, the following operations may be performed: releasing the PDU requested by the terminal and/or the second network element to be released session;

For at least one of the PDU session indicated by the PDU session information that the terminal requests to suspend and the first network element to request to suspend the PDU session indicated by the PDU session information, the following operations may be performed: suspend the terminal and/or the second network element requesting Released PDU session;

For the failed PDU session indicated by the PDU session restoration result information of the first network element, at least one of the following operations may be performed:

Suspend to resume the context of a failed PDU session,

Delete the context of the failed PDU session,

Request the user plane function entity to delete the failed PDU session.

Optionally, after the second network element performs the foregoing operations on the corresponding PDU session, the method may further include: generating PDU session recovery result information of the second network element, and sending the PDU session recovery result information of the second network element to the first network element. sent to the terminal by the network element and/or through the first network element. In this way, the first network unit can further process the PDU session according to the PDU session recovery result information of the second network unit, and the processing method can refer to the above scenario 1, so it is not repeated here.

Scenario five.

Corresponding to scenario 2, after receiving the operation request information sent by the terminal, the first network unit may directly forward the operation request information to the second network unit, and the second network unit directly processes the PDU session of the terminal according to the operation request. . Wherein, the operation request information may include: PDU session information requested by the terminal to resume, release and/or suspend. In addition to processing the above-mentioned PDU session, the second network unit can also obtain the PDU session information requested by the third network unit (such as SMF, user plane function, etc.) to resume, release and/or suspend, as in scenario 4, and PDU session information that requires downlink data transmission and/or PDU session information that has received downlink data notification. For the processing method of the corresponding PDU session by the second network unit, reference may be made to the scenario 4, so it will not be repeated here.

scene six,

Corresponding to scenario 3, the second network unit acquires the PDU session information requested by the third network unit (such as SMF, user plane function, etc.) to resume, release and/or suspend, as well as the PDU session information and/or PDU session information that requires downlink data transmission Receive the PDU session information notified by the downlink data; and can send the PDU session information that the third network element requests to resume, release and/or suspend to the first network element through a paging request or a notification message, as well as the downlink data transmission needs. PDU session information and/or PDU session information notified by downlink data.

In the session control method of the embodiment of the present invention, the second network unit obtains the operation request information of the PDU session information of the packet data unit; and performs PDU session processing according to the operation request information. The operation request information may include at least one of the following information: the operation request information includes at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to release, and PDU session requested by the terminal to be suspended information, PDU session recovery result information of the first network element, information of the PDU session requested by the third network element to resume, information of the PDU session requested by the third network element to be released, information of the PDU session requested by the third network element to be suspended, and downlink data transmission Required PDU session information and/or PDU session information notified by downlink data. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

The above embodiments respectively introduce the session control methods in different scenarios in detail, and the corresponding network devices will be further described in this embodiment below with reference to the accompanying drawings.

As shown in FIG. 6 , the network device 600 in the embodiment of the present invention can realize the operation request information for obtaining the PDU session information of the packet data unit in the above-mentioned embodiment, and according to the operation request information, perform the details of the PDU session processing method, and achieve the same Effectively, the network device 600 specifically includes the following functional modules:

The third obtaining module 610 can be used to obtain the operation request information of the PDU session information of the packet data unit; the operation request information can include at least one of the following information: PDU session information requested by the terminal to be restored, PDU session information requested by the terminal to be released, PDU session information requested by the terminal to be suspended, PDU session restoration result information of the first network element, PDU session information requested by the third network element to be resumed, PDU session information requested by the third network element to be released, and PDU session information requested by the third network element to be suspended Session information, PDU session information for downlink data transmission requirements, and PDU session information for receiving downlink data notifications;

The third processing module 620 may be configured to perform PDU session processing according to the operation request information.

Wherein, the PDU session recovery result information of the first network unit may include at least one of the following information: PDU session information for successful recovery, PDU session information for recovery failure, PDU session information for requesting release, and PDU session information for requesting suspension ;

The PDU session information that the terminal requests to restore may be the PDU session information that the terminal requests to restore and is forwarded by the first network element or sent by the terminal;

The PDU session information that the terminal requests to release may be the PDU session information that the terminal requests to release and is forwarded by the first network element or sent by the terminal;

The PDU session information requested by the terminal to be suspended may be PDU session information forwarded by the first network element or sent by the terminal and requested to be resumed by the terminal.

Wherein, the third processing module 620 may include at least one of the following:

The eighth processing submodule is configured to perform at least one of the following operations for the PDU session that needs to be restored:

restore the context of the corresponding PDU session,

Send the downlink transmission address of the corresponding PDU session to the user plane functional entity, and activate the corresponding PDU session to the user plane functional entity;

Wherein, the PDU session that needs to be restored may include: a PDU session indicated by the PDU session restoration result information of the first network unit that is successfully restored, a PDU session indicated by the PDU session information requested by the terminal to be restored, and a PDU session requested by the third network unit to be restored. The PDU session indicated by the information, the PDU session indicated by the PDU session information with downlink data transmission requirements, the PDU session indicated by the PDU session information received the downlink data notification, the PDU session recovery result information of the first network element indicates that the recovery is successful and the third The PDU session requested by the network element to be restored, the PDU session restoration result information of the first network element indicates that the restoration is successful and the PDU session information indicates that there is a downlink data transmission requirement, and the PDU session restoration result information of the first network element indicates that the restoration is successful and At least one of the PDU session indicated by the PDU session information notified by the downlink data and the PDU session that the terminal requests to resume and the PDU session resume result information of the first network element indicates that the resume is successful.

The ninth processing submodule can be used to perform the following operations on at least one of the PDU session indicated by the PDU session information that the terminal requests to release and the PDU session indicated by the first network element's request to release the PDU session information, and perform the following operations: release the terminal and/or The PDU session that the second network element requests to release;

The tenth processing sub-module may be configured to perform the following operations on at least one of the PDU session indicated by the PDU session information requested by the terminal and the PDU session indicated by the PDU session information requested by the first network element to be suspended: suspend the terminal and/or the PDU session requested by the second network element to be released;

The eleventh processing submodule may be configured to perform at least one of the following operations on the PDU session that fails to be restored indicated by the PDU session restoration result information of the first network element:

Suspend to resume the context of a failed PDU session,

Delete the context of the failed PDU session,

Request the user plane function entity to delete the failed PDU session.

Wherein, the network device 600 may further include:

The first generating module can be configured to generate PDU session recovery result information of the second network element; wherein, the PDU session recovery result information of the second network element can include at least one of the following information: a PDU that the second network element recovers successfully Session information, PDU session information that the second network element fails to restore, PDU session information that the second network element requests to resume, PDU session information that the second network element requests to release, and PDU session information that the second network element requests to suspend;

The second sending module may be configured to send the PDU session recovery result information of the second network element to the first network element and/or to the terminal through the first network element.

Wherein, the PDU session information requested by the second network to be restored may include at least one of the following: PDU session information required for downlink data transmission, PDU session received notification of downlink data, and PDU session requested by the third network element to be restored;

The PDU session information requested by the second network to be suspended may include at least one of the following: a PDU session that the second network fails to recover, a PDU session that the first network element recovers successfully but the second network fails to recover, and the first network element and the terminal recover successfully But the second network recovers the failed PDU session;

The PDU session information requested by the second network to be released may include at least one of the following: a PDU session that the second network fails to recover, a PDU session that the first network element recovers successfully but the second network fails to recover, the first network element and the terminal recovers successfully but The second network recovers the failed PDU session.

Wherein, the third processing module 620 may further include:

The twelfth processing sub-module can be used when the operation request information is the PDU session information requested by the third network unit to resume, the third network unit request to release the PDU session information, the PDU session information requested by the third network unit to be suspended, and the downlink When at least one of the PDU session information required for data transmission and the PDU session information notified by the downlink data is received, the PDU session information requested by the third network unit to be restored is sent to the first network unit through a paging request or a notification message. At least one of the PDU session information requested by the network element to be released, the PDU session information requested by the third network element to be suspended, the PDU session information that requires downlink data transmission, and the PDU session information that has received downlink data notification.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, suspension indication information, release indication information, PDU session identification bitmap information and QoS flow information in the PDU session.

Wherein, the first network unit may include at least one of the following: radio access network equipment, radio access network node, radio access network functional unit, centralized unit CU, distributed unit DU, base station, eNB, gNB, N3IWF, AC , access point AP device or wireless local area network WLAN node;

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane function UPF;

The third network unit may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane Function UPF.

The network device in the embodiment of the present invention obtains the operation request information of the PDU session information of the packet data unit; and performs the PDU session processing according to the operation request information. The operation request information may include at least one of the following information: the operation request information may include at least one of the following information: PDU session information requested by the terminal to resume, PDU session information requested by the terminal to release, and PDU requested by the terminal to be suspended Session information, PDU session recovery result information of the first network element, information of the PDU session requested by the third network element to resume, information of the PDU session requested by the third network element to release, information of the PDU session requested by the third network element to be suspended, and downlink data PDU session information required for transmission and PDU session information notified by downlink data. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

In order to better achieve the above object, an embodiment of the present invention also provides a network device, the network device includes a processor, a memory, and a computer program stored in the memory and running on the processor, where the processor executes the computer program When implementing the steps in the session control method above. Embodiments of the invention also provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above session control method are implemented.

Specifically, an embodiment of the present invention also provides a network device. As shown in FIG. 7 , the network device 700 may include: an antenna 71 , a radio frequency device 72 , and a baseband device 73 . The antenna 71 is connected to the radio frequency device 72 . In the uplink direction, the radio frequency device 72 receives information through the antenna 71, and sends the received information to the baseband device 73 for processing. In the downlink direction, the baseband device 73 processes the information to be sent and sends it to the radio frequency device 72 , and the radio frequency device 72 processes the received information and sends it out through the antenna 71 .

The above-mentioned frequency band processing apparatus may be located in the baseband apparatus 73 , and the method performed by the network device in the above embodiment may be implemented in the baseband apparatus 73 . The baseband apparatus 73 includes a processor 74 and a memory 75 .

The baseband device 73 may include, for example, at least one baseband board on which a plurality of chips are arranged. As shown in FIG. 7 , one of the chips is, for example, the processor 74 , which is connected to the memory 75 to call the program in the memory 75 and execute it. The network devices shown in the above method embodiments operate.

The baseband device 73 may further include a network interface 76 for exchanging information with the radio frequency device 72, and the interface is, for example, a common public radio interface (CPRI for short).

The processor here may be a processor or a collective term for multiple processing elements. For example, the processor may be a CPU, an ASIC, or one or more of the methods configured to implement the above network device execution methods. An integrated circuit, such as: one or more microprocessors DSP, or, one or more field programmable gate array FPGA, etc. The storage element may be one memory or a collective term for multiple storage elements.

Memory 75 may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be Read-Only Memory (ROM for short), Programmable ROM (PROM for short), Erasable PROM for short (EPROM) , Electrically Erasable Programmable Read-Only Memory (Electrically EPROM, EEPROM for short) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM for short), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic RAM (DRAM), Synchronous DRAM , referred to as SDRAM), double data rate synchronous dynamic random access memory (Double DataRate SDRAM, referred to as DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, referred to as ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM) , referred to as SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, referred to as DRRAM). The memory 75 described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Specifically, the network device in the embodiment of the present invention further includes: a computer program stored on the memory 75 and executable on the processor 74, and the processor 74 invokes the computer program in the memory 75 to execute the program shown in FIG. 2, FIG. 4 or FIG. 6. Shows the methods performed by each module.

The network device in the embodiment of the present invention obtains the operation request information of the PDU session information of the packet data unit; and performs PDU session processing according to the operation request information. In this way, through the mutual cooperation between the terminal, the first network unit and the second network unit, when the connection of the suspended terminal is restored, it can restore the PDU session according to the PDU session information that needs to be restored in the operation request information, thereby saving energy. resources of the radio access network, reducing signaling overhead.

The above embodiment introduces the session control method of the present invention from the network device side, and the present embodiment will further introduce the session control method on the terminal side with reference to the accompanying drawings.

As shown in FIG. 8 , the session control method according to the embodiment of the present invention, applied to the terminal side, specifically includes the following steps:

Step 81: Send the operation request information of the packet data unit PDU session information to the first network element.

The operation request information may include at least one of the following: PDU session information requested by the terminal itself, PDU session information requested by the second network to be restored, and PDU session information requested by the first network to be restored.

Step 82: Receive the PDU session operation response information sent by the first network element according to the operation request information.

Optionally, the PDU session operation response information includes: confirming recovery and/or confirming unrecoverable PDU session information.

Step 83: Process the PDU session according to the PDU session operation response information.

Specifically, the step of processing the PDU session according to the information of confirming the restoration and/or confirming the PDU session that cannot be restored may include at least one of the following: restoring the PDU session confirming the restoration according to the information of the PDU session confirming the restoration; Confirm the information of the PDU session that cannot be resumed, and release or suspend the PDU session that cannot be resumed.

In an embodiment, before step 81, the method may further include: generating PDU session information for requesting recovery. After generating the PDU session information for requesting restoration, the PDU session information for requesting restoration is sent to the first network unit, and specifically, the sending may be performed through an RRC restoration request.

In an implementation manner, before step 81 , the method may further include: receiving PDU session information sent by the first network element for requesting restoration. Specifically, the PDU session information requested to be restored and sent by the first network unit may be received through paging.

In an implementation manner, before step 81, the method may further include: receiving, through the first network element, the PDU session information that is sent by the second network element and is requested to be restored. Specifically, the PDU session information requested by the second network unit to be restored and sent by the first network unit may be received through paging.

Optionally, before step 81, the method may further include: receiving, through a notification message, the PDU session information requested by the second unit to resume.

Optionally, after step 81, it may further include: Optionally, after the step of processing the PDU session according to the information of confirming the restoration or confirming the PDU session that cannot be restored, it may further include: generating a terminal after the PDU session is processed. The PDU session recovery result information of the PDU is fed back to the first network unit. The PDU recovery result information of the terminal may include at least one of the following information: PDU session information on which the terminal recovers successfully, PDU session information on which the terminal fails to recover, PDU session information on which the terminal successfully releases, and PDU session information on which the terminal suspends.

It is worth noting that the above PDU session information may include at least one of the following information: PDU session identification information, resume indication information, resume indication information, suspend indication information, release indication information, PDU session identification bitmap information and PDU session information Medium QoS flow information. The bit position in the PDU session identification bitmap represents the PDU session identification, and a certain bit position indicates whether to resume indicates whether the PDU session represented by the bit is resumed.

The above-mentioned first network unit may include at least one of the following: radio access network equipment, radio access network node, radio access network functional unit, centralized unit CU, distributed unit DU, base station, eNB, gNB, N3IWF, access Control node AC, access point AP device or wireless local area network WLAN node;

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane Function UPF.

In the embodiment of the present invention, through the cooperation of the terminal, the first network unit and the second network unit, the suspended terminal can resume the PDU session on demand when the connection is resumed, thus saving the resources of the wireless access network and reducing the signaling overhead.

The above embodiments introduce session control methods in different scenarios, and the corresponding terminals will be further introduced below with reference to the accompanying drawings.

As shown in FIG. 9 , the terminal 900 in the embodiment of the present invention can implement the details of the method for sending the recovery-requesting packet data unit PDU session information to the first network element in the above-mentioned embodiment, and achieve the same effect. The terminal 900 may include: The following functional modules:

The third sending module 910 can be configured to send the operation request information of the packet data unit PDU session information to the first network unit;

The second receiving module 920 can be configured to receive the PDU session recovery result information of the first network unit sent by the first network unit according to the operation request information;

The fourth processing module 930 may be configured to process the PDU session according to the PDU session recovery result information of the first network element.

Wherein, the operation request information includes at least one of the following:

The PDU session information requested by the terminal itself, the PDU session information requested by the second network to be restored, and the PDU session information requested by the first network to be restored.

The terminal 900 may further include at least one of the following:

The second generation module can be used to generate the PDU session information for requesting recovery;

The third receiving module can be configured to receive the PDU session information that is sent by the first network element and is requested to be restored;

The fourth sending module may be configured to receive, through the first network unit, the PDU session information that is sent by the second network unit and is requested to be restored.

Wherein, the PDU session restoration result information of the first network element may include: confirming the restoration and/or confirming the information of the PDU session that cannot be restored;

The fourth processing module 930 may include at least one of the following:

The thirteenth processing sub-module may be configured to process the PDU session according to the information of confirming the restoration and/or confirming the PDU session that cannot be restored.

Optionally, the thirteenth processing submodule may be configured to: restore the PDU session confirmed to be restored according to the information of the restored PDU session;

Release or suspend the unrecoverable PDU session according to the information confirming the unrecoverable PDU session.

Wherein, the fourth processing module 930 may further include:

The feedback sub-module can be used to generate PDU session recovery result information of the terminal after the PDU session processing and feed it back to the first network element; wherein, the PDU recovery result information of the terminal can include at least one of the following information: PDU session information, PDU session information that the terminal fails to resume, PDU session information that the terminal releases successfully, and PDU session information that the terminal suspends.

The PDU session information may include at least one of the following information: PDU session identification information, resume indication information, resume indication information, suspend indication information, release indication information, PDU session identification bitmap information, and QoS flow information in the PDU session .

Wherein, the first network unit may include at least one of the following: radio access network equipment, radio access network node, radio access network functional unit, centralized unit CU, distributed unit DU, base station, eNB, gNB, N3IWF, connection Access control node AC, access point AP device or wireless local area network WLAN node;

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane Function UPF.

It is worth noting that, in this embodiment of the present invention, through the cooperation of the terminal, the first network unit and the second network unit, the suspended terminal can resume the PDU session on demand when the connection is resumed, which saves the resources of the wireless access network and reduces the Signaling overhead.

It should be noted that it should be understood that the above division of each module of the network device and the terminal is only a division of logical functions, and may be fully or partially integrated into one physical entity in actual implementation, or may be physically separated. And these modules can all be implemented in the form of software calling through processing elements; they can also all be implemented in hardware; some modules can also be implemented in the form of calling software through processing elements, and some modules can be implemented in hardware. For example, the determination module may be a separately established processing element, or may be integrated into a certain chip of the above-mentioned device to be implemented, in addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device may Call and execute the function of the above determined module. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, and can also be implemented independently. The processing element here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above-mentioned method or each of the above-mentioned modules can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.

For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), or one or more microprocessors ( digital signal processor, referred to as DSP), or, one or more Field Programmable Gate Array (Field Programmable Gate Array, referred to as FPGA) and the like. For another example, when one of the above modules is implemented in the form of processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU for short) or other processors that can call program codes. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC for short).

In order to better achieve the above purpose, further, FIG. 10 is a schematic diagram of the hardware structure of a terminal for implementing various embodiments of the present invention. The terminal 100 includes but is not limited to: a radio frequency unit 101, a network module 102, an audio output unit 103, The input unit 104, the sensor 105, the display unit 106, the user input unit 107, the interface unit 108, the memory 109, the processor 1010, the power supply 1011 and other components. Those skilled in the art can understand that the terminal structure shown in FIG. 10 does not constitute a limitation on the terminal, and the terminal may include more or less components than the one shown, or combine some components, or arrange different components. In the embodiment of the present invention, the terminal includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

Wherein, the radio frequency unit 101 may be configured to send, under the control of the processor 1010, the packet data unit PDU session information for requesting recovery to the first network unit.

Wherein, the PDU session information requested to resume may include at least one of the following:

The PDU session information requested by the terminal itself, the PDU session information requested by the second network to be restored, and the PDU session information requested by the first network to be restored.

Specifically, the processor 1010 may be configured to perform at least one of the following before sending the packet data unit PDU session information for requesting recovery to the first network element:

Generate PDU session information requesting recovery;

Receive the PDU session information that is sent by the first network element to request recovery;

Receive, through the first network element, the PDU session information that is sent by the second network element for requesting restoration;

receiving, through paging, the PDU session information that is sent by the first network element and that requests recovery;

receiving, through paging, the PDU session information requested by the second network element to be restored and sent by the first network element;

Through the notification message, the PDU session information requested by the second unit to resume is received.

Specifically, the processor 1010 may be further configured to: receive the information fed back by the first network unit to confirm the resumed PDU session and/or to confirm the information of the PDU session that cannot be resumed;

The PDU session is processed according to the information confirming the restoration or confirming the PDU session that cannot be restored.

Specifically, the processor 1010 may be further configured to: restore the PDU session confirmed to be restored according to the information of the restored PDU session;

Release or suspend the unrecoverable PDU session according to the information confirming the unrecoverable PDU session.

Specifically, the processor 1010 is further configured to: generate PDU session recovery result information of the terminal after the PDU session processing and feed it back to the first network unit; wherein, the PDU recovery result information of the terminal may include at least one of the following information: the terminal Information about PDU sessions that are successfully restored, information about PDU sessions that fail to be restored by the terminal, information about PDU sessions that are successfully released by the terminal, and information about PDU sessions that are suspended by the terminal.

Specifically, the PDU session information may include at least one of the following information: PDU session identification information, resume indication information, resume indication information, suspend indication information, release indication information, PDU session identification bitmap information, and QoS flow in the PDU session information.

Specifically, the above-mentioned first network unit may include at least one of the following: radio access network equipment, radio access network node, radio access network functional unit, centralized unit CU, distributed unit DU, base station, eNB, gNB, N3IWF , access control node AC, access point AP device or wireless local area network WLAN node;

The second network element may include at least one of the following: core network equipment, core network nodes, core network functional units, mobility management entity MME, access management function AMF, session management function SMF, serving gateway SGW, PDN gateway PGW, user plane Function UPF.

Specifically, the terminal generates a PDU session recovery requirement;

The terminal sends the PDU session information requesting recovery;

The terminal sends the PDU session information requesting recovery to the first network element.

Further, the terminal receives the PDU session information confirming the recovery;

The terminal performs a PDU recovery operation according to the PDU session information confirmed to be recovered.

Before receiving the PDU session information confirming the restoration, the terminal also sends the PDU session information requesting restoration.

In the embodiment of the present invention, through the cooperation of the terminal, the first network unit and the second network unit, the suspended terminal can resume the PDU session on demand when the connection is resumed, thus saving the resources of the wireless access network and reducing the signaling overhead.

It should be understood that, in this embodiment of the present invention, the radio frequency unit 101 can be used for receiving and sending signals during sending and receiving of information or during a call. Specifically, after receiving the downlink data from the base station, it is processed by the processor 1010; The uplink data is sent to the base station. Generally, the radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with the network and other devices through a wireless communication system.

The terminal provides the user with wireless broadband Internet access through the network module 102, such as helping the user to send and receive emails, browse web pages, and access streaming media.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into audio signals and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the terminal 100 (eg, call signal reception sound, message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive audio or video signals. The input unit 104 may include a graphics processor (Graphics Processing Unit, GPU) 1041 and a microphone 1042. The graphics processor 1041 captures images of still pictures or videos obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode data is processed. The processed image frames may be displayed on the display unit 106 . The image frames processed by the graphics processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102 . The microphone 1042 can receive sound and can process such sound into audio data. The processed audio data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 101 for output in the case of a telephone call mode.

The terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and/or when the terminal 100 is moved to the ear. or backlight. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, The sensor 105 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared Sensors, etc., will not be repeated here.

The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

The user input unit 107 may be used to receive input numerical or character information, and generate key signal input related to user settings and function control of the terminal. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072 . The touch panel 1071, also referred to as a touch screen, can collect the user's touch operations on or near it (such as the user's finger, stylus, etc., any suitable object or attachment on or near the touch panel 1071). operate). The touch panel 1071 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 1010, the command sent by the processor 1010 is received and executed. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 1071 , the user input unit 107 may also include other input devices 1072 . Specifically, other input devices 1072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described herein again.

Further, the touch panel 1071 can be covered on the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits it to the processor 1010 to determine the type of the touch event, and then the processor 1010 determines the type of the touch event according to the touch The type of event provides corresponding visual output on display panel 1061 . Although in FIG. 10, the touch panel 1071 and the display panel 1061 are used as two independent components to realize the input and output functions of the terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to form a Realize the input and output functions of the terminal, which is not limited here.

The interface unit 108 is an interface for connecting an external device to the terminal 100 . For example, external devices may include wired or wireless headset ports, external power (or battery charger) ports, wired or wireless data ports, memory card ports, ports for connecting devices with identification modules, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 108 may be used to receive input (eg, data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 100 or may be used between the terminal 100 and the external device. transfer data between.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program (such as a sound playback function, an image playback function, etc.) required for at least one function, and the like; Data created by the use of the mobile phone (such as audio data, phone book, etc.), etc. Additionally, memory 109 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 1010 is the control center of the terminal, using various interfaces and lines to connect various parts of the entire terminal, by running or executing the software programs and/or modules stored in the memory 109, and calling the data stored in the memory 109. Various functions of the terminal and processing data, so as to monitor the terminal as a whole. The processor 1010 may include one or more processing units; preferably, the processor 1010 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 1010.

The terminal 100 may also include a power supply 1011 (such as a battery) for supplying power to various components. Preferably, the power supply 1011 may be logically connected to the processor 1010 through a power management system, so as to manage charging, discharging, and power consumption management through the power management system. Function.

In addition, the terminal 100 includes some unshown functional modules, which are not repeated here.

Preferably, an embodiment of the present invention further provides a terminal, including a processor 1010, a memory 109, a computer program stored in the memory 109 and running on the processor 1010, the computer program being executed by the processor 1010 to implement the above session The various processes of the control method embodiments can achieve the same technical effect, and are not repeated here in order to avoid repetition. The terminal may be a wireless terminal or a wired terminal, and the wireless terminal may be a device that provides voice and/or other service data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem . A wireless terminal can communicate with one or more core networks via a Radio Access Network (RAN), and the wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a mobile phone Computers, for example, may be portable, pocket-sized, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange language and/or data with the wireless access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants , referred to as PDA) and other equipment. A wireless terminal may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a connection Access Terminal, User Terminal, User Agent, User Device or User Equipment, which are not limited here.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, each process of the above-mentioned embodiment of the session control method can be implemented, and the same technology can be achieved. The effect, in order to avoid repetition, is not repeated here. Among them, the computer-readable storage medium, such as a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, etc.

Different processing methods of the session control method in this embodiment of the present invention are respectively introduced from the first network unit, the second network unit, and the terminal. In the following, this embodiment will take the PDU session recovery operation as an example to describe the session control method in different scenarios. Further explanation.

As shown in FIG. 11 , the network architecture of the embodiment of the present invention includes: a terminal, a first network unit (take a wireless access network as an example), and a second network unit (take a core network as an example), where the core network includes access The management function AMF, the session management function SMF and the user plane function. The radio access network receives the PDU session information sent by the UE for requesting restoration, and restores the PDU session requested by the UE according to the restoration. The radio access network sends the PDU session information requested by the UE to resume to the core network.

first embodiment

The UE sends the PDU session information requested to be restored to the radio access network, and the radio access network can restore the PDU session according to the request of the UE for restoration, and notify the core network of the PDU session restoration result to restore the PDU session. The core network receives the PDU session restoration result sent by the radio access network to perform PDU session restoration, and notifies the wireless access network of the PDU session restoration result of the core network. The UE performs PDU session recovery according to the PDU session confirmed and recovered by the radio access network.

Specifically, this embodiment is a restoration operation. The PDU session restoration sequence is that the radio access network and the UE restore first, and then the core network side restores the PDU session according to the PDU session restoration result between the UE and the radio access network. The advantage is that after the PDU session recovery between the UE and the radio access network is completed, the UE can send uplink data. In this embodiment, the radio access network restores the PDU session according to the PDU session information requested by the UE to be restored. As shown in Figure 12, this embodiment specifically includes the following steps:

Step 121: The UE sends an RRC recovery request to the radio access network. Here, the RRC recovery request corresponds to the above-mentioned operation request information. Optionally, at least one of the following may be indicated in the operation request information: information of a PDU session requesting to be resumed.

For PDU sessions that do not belong to the request for recovery, the radio access network can continue to suspend or release.

The radio access network may perform a PDU session recovery operation according to the request of the UE, including at least one of the following:

- restore the context of the specified PDU session,

-Recover the radio bearer (such as Data Resource Bearer (DRB), etc.) of the specified PDU session mapping,

- assign or map radio bearers (such as DRBs) for specified PDU sessions,

- Restoring the connection between the radio access network and the core network with respect to the UE.

In some embodiments, due to the shortage of radio resources, not every PDU session requested by the UE can be allocated radio resources. Therefore, the radio access network can send the information confirming the resumed PDU session to the UE.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 122: the radio access network sends the RRC recovery to the UE, and the RRC recovery carries the PDU session recovery result information. Optionally, the RRC recovery indicates at least one of the following: confirming the recovered PDU session information and confirming the unrecoverable PDU session information.

The UE performs the PDU session recovery according to the indicated "PDU session information for confirming the recovery and/or PDU session information for confirming that the recovery cannot be performed".

Step 123: The UE sends the RRC recovery complete to the radio access network. Optionally, at least one of the following may be indicated in the RRC recovery completion: the information of the PDU session that the UE recovers successfully, and the information of the PDU session that the UE side fails to recover.

In some embodiments, due to unpredictable reasons, the UE side may not be able to resume the PDU session. The UE needs to return the PDU session recovery result information of the UE to confirm the recovery result of the PDU session on the UE.

Step 124: The radio access network sends a recovery request to the access mobility management function.

Optionally, the recovery request carries the PDU session recovery result information of the wireless access network, which may specifically indicate at least one of the following: information about a successful recovery PDU session and information about a failed recovery PDU session. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 125: The access mobility management function sends a recovery request to the session management function of the UE's PDU session.

Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

in,

- For a successfully restored UE's PDU session, the session management function can perform at least one of the following: restore the UE's PDU session context, transfer the downlink transmission address of the UE's PDU session (that is, the transmission address allocated by the radio access network for the UE's PDU session) address) to send the user plane function, activate the UE's PDU session to the user plane function, and set the UE's PDU session state to active.

- For the PDU session of the failed UE and/or the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE, delete the PDU session of the UE, and request deletion of the user plane function UE's PDU session. In some embodiments, whether to continue to suspend or delete the PDU session of the UE that failed to restore depends on the reason for the failure to restore. For example, a recovery failure caused by insufficient resources on the radio access network side can continue to be suspended. For example, if the PDU session requested to be restored is unknown, the PDU session description information is inconsistent and should be deleted.

- For the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE.

- For the PDU session information requested to be released, the session management function may perform at least one of the following: delete the PDU session of the UE, and request the user plane function to delete the PDU session of the UE.

Step 126: The session management function sends a recovery response to the access mobility management function, where the recovery response corresponds to the PDU session recovery result information of the second network element. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side.

Step 127: The access mobility management function sends a recovery response to the wireless access network, corresponding to the PDU session recovery result information of the second network element. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side.

- For the information of the failed PDU session, the radio access network may perform one of the following: suspend the context of the PDU session, suspend the context of the mapped radio bearer of the PDU session, release the bearer resources, save the uplink transport address of the PDU session ( That is, the user plane function is the transmission address assigned to the UE's PDU session), setting the UE's PDU session state to suspended, requesting the UE to suspend the PDU session, deleting the PDU session context, and requesting the UE to delete the PDU session.

Second Embodiment

This embodiment is a recovery operation. The restoration sequence is that the radio access network side and the UE restore the PDU session first; the core network side then restores the PDU session according to the PDU session restoration result between the UE and the radio access side. The advantage is that the UE can send uplink data after the recovery of the PDU session between the UE and the radio access network is completed.

In this embodiment, the network performs recovery according to the PDU session information requested by the UE and the PDU session information requested by the second network unit, if there is a PDU session information required for data transmission. As shown in Figure 13, this embodiment specifically includes the following steps:

Step 131: The UE sends an RRC recovery request to the radio access network. Optionally, at least one of the following may be indicated in the request: the information of the PDU session that is requested to be resumed.

For PDU sessions that do not belong to the request for recovery, the radio access network can continue to suspend or release.

The radio access network may perform a PDU session recovery operation according to the request of the UE, including at least one of the following:

- restore the context of the specified PDU session,

- restore the radio bearer (e.g. DRB) mapped by the specified PDU session,

- assign or map radio bearers (such as DRBs) for specified PDU sessions,

- Restoring the connection between the radio access network and the core network with respect to the UE.

In some embodiments, due to the shortage of radio resources, not every PDU session requested by the UE can be allocated radio resources. Therefore, the radio access network needs to be able to send the information to confirm the resumed PDU session to the UE.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 132 : the radio access network sends the RRC recovery to the UE, optionally, the RRC recovery indication is at least one of the following: confirming the information of the recovered PDU session and confirming the information of the unrecoverable PDU session.

The UE performs PDU session recovery according to the indicated "information to confirm the recovered PDU session and/or information to confirm the PDU session that cannot be recovered".

Step 133: The UE sends the RRC recovery complete to the radio access network. Optionally, at least one of the following may be indicated in the RRC recovery completion: the information of the PDU session that the UE recovers successfully, and the information of the PDU session that the UE side fails to recover.

In some embodiments, due to unpredictable reasons, the UE side may not be able to resume the PDU session. The UE is required to return the PDU session recovery result of the UE.

Step 134: The radio access network sends a recovery request to the access mobility management function.

Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 135: The access mobility management function sends a recovery request to the session management function of the UE's PDU session.

Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

- For a successfully restored UE's PDU session, the session management function can perform at least one of the following: restore the UE's PDU session context, transfer the downlink transmission address of the UE's PDU session (that is, the transmission address allocated by the radio access network for the UE's PDU session) address) to send the user plane function, activate the UE's PDU session to the user plane function, and set the UE's PDU session state to active.

- For the PDU session of the failed UE and/or the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE, delete the PDU session of the UE, request deletion of the user plane function PDU session of the UE. In some embodiments, whether to continue to suspend or delete the PDU session of the UE that failed to restore depends on the reason for the failure to restore. For example, a recovery failure caused by insufficient resources on the radio access network side can continue to be suspended. For example, if the PDU session requested to be restored is unknown, the PDU session description information is inconsistent and should be deleted.

- For the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE.

- For the PDU session information requested to be released, the session management function may perform at least one of the following: delete the PDU session of the UE, and request the user plane function to delete the PDU session of the UE.

- For a PDU session that requires downlink data transmission (such as receiving downlink data notification), the session management function can perform at least one of the following: restore the PDU session of the UE, and send information about the PDU session that requires restoration of the PDU session.

Step 136: The session management function sends a recovery response to the access mobility management function. Optionally, at least one of the following may be indicated in the request: information about a PDU session that is successfully restored, information about a PDU session that fails to be restored, and information about a PDU session that the core network requests to restore. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side. The information of the PDU session required to be resumed indicates the information of the PDU session that is additionally required by the session management function to be resumed.

Step 137: The access mobility management function sends a recovery response to the radio access network. Optionally, at least one of the following may be indicated in the request: information about a PDU session that is successfully restored, information about a PDU session that fails to be restored, and information about a PDU session that the core network requests to restore. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side.

- For the information of the failed PDU session, the radio access network may perform one of the following: suspend the context of the PDU session, suspend the context of the mapped radio bearer of the PDU session, release the bearer resources, save the uplink transport address of the PDU session ( That is, the user plane function is the transmission address assigned to the UE's PDU session), setting the UE's PDU session state to suspended, requesting the UE to suspend the PDU session, deleting the PDU session context, and requesting the UE to delete the PDU session.

- Information of the PDU session for which restoration is required, the radio access network may perform one of the following: restoration of the PDU session of the UE, and requesting the UE to restore the PDU session. The UE may be requested by the RRC reconfiguration message containing the specified resumed PDU session.

Depending on the information on the PDU session that requires resumption, the radio access network may perform one of the following:

- restore the context of the specified PDU session,

- restore the radio bearer (e.g. DRB) mapped by the specified PDU session,

- assign or map radio bearers (such as DRBs) for specified PDU sessions,

- Restoring the connection between the radio access network and the core network with respect to the UE.

- Send information to the UE for the PDU session requiring release/suspend.

Optionally, step 138: the radio access network sends an RRC reconfiguration request message to the UE. Optionally, the message may include information about the PDU session that requires restoration.

The UE restores the specified PDU session according to the information of the PDU session that is required to be restored.

Optionally, step 139: the UE returns an RRC reconfiguration message response message to the radio access network. Optionally, at least one of the following may be indicated in the message: information about a PDU session that the UE recovers successfully, and information about a PDU session that fails to be recovered by the UE side.

Third Embodiment

This embodiment is a restoration operation. The PDU session restoration sequence is that the radio access network side and the UE restore the PDU session first, and then the core network side performs the restoration according to the PDU session restoration result between the UE and the radio access network and the PDU session information requested by the UE to restore. Resume of PDU session. The advantage is that after the PDU session recovery between the UE and the radio access network is completed, the UE can send uplink data. In this embodiment, the radio access network attempts to restore all suspended PDU sessions of the UE, and preferentially restores the PDU session information requested by the UE when resources are insufficient. After the recovery request arrives at the session management function, the session management function network performs recovery according to the PDU session information requested by the UE and the PDU session information that has a data transmission requirement. The radio access network suspends/releases the resources of the unnecessary PDU session according to the information of the PDU session that the session management function finally needs to restore. As shown in Figure 14, this embodiment specifically includes the following steps:

Step 141: The UE sends an RRC recovery request to the radio access network. Optionally, the UE may indicate at least one of the following in step 141 or step 143: the information of the PDU session that the UE requests to resume.

Optionally, the radio access network performs a PDU session recovery operation, which may include at least one of the following:

- resume the context of the suspended UE's PDU session,

- Resume a suspended UEPDU session mapped radio bearer (eg DRB),

- allocating or mapping radio bearers (such as DRBs) for the UE's PDU session,

- Restoring the connection between the radio access network and the core network with respect to the UE.

In some embodiments, due to the shortage of radio resources, not every PDU session requested by the UE can be allocated radio resources. The radio access network may preferentially resume the PDU session that the UE requests to activate. In addition, the radio access network may send information confirming the resumed PDU session to the UE.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 142: The radio access network sends the RRC recovery to the UE. Optionally, the RRC recovery indicates at least one of the following: information for confirming the recovered PDU session. In some embodiments, the PDU session information confirmed to be restored may be a PDU session successfully restored by the radio access side.

The UE performs PDU session recovery according to the indicated "information confirming the recovered PDU session".

Step 143: The UE sends the RRC recovery complete to the radio access network. Optionally, the PDU session recovery result information of the UE may be indicated in the RRC recovery completion, including at least one of the following: information about a PDU session that the UE recovers successfully, and information about a PDU session that the UE side fails to recover.

In some embodiments, some PDU sessions may fail to recover at the UE side due to unpredictable reasons. To recover the failed PDU session on the UE side, the radio access network may perform one of the following: release/suspend the PDU session, and request the core network to release/suspend the PDU session.

Step 144: The radio access network sends a recovery request to the access mobility management function.

Optionally, the request carries the PDU session restoration result information of the wireless access network and the PDU session information requested by the terminal to restore, which may specifically indicate at least one of the following: information about a PDU session that is successfully restored, and information about a PDU session that fails to restore. information, the information of the PDU session that the UE requests to resume. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 145: The access mobility management function sends a recovery request to the session management function of the UE's PDU session.

Optionally, at least one of the following may be indicated in the request: information about a PDU session that is successfully restored, information about a PDU session that fails to be restored, and information about a PDU session that the UE requests to restore. The information of the successfully restored PDU session may be the information of the successfully restored PDU session on both the radio access network and the UE side.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

- at least one of 1, the PDU session that the radio access network side restores successfully and is a PDU session that the UE requests to activate and 2, the PDU session that the radio access network side restores successfully and has downlink data transmission requirements, at least one of, The session management function may perform at least one of the following: restore the UE's PDU session context, send the downlink transport address of the UE's PDU session (that is, the transport address allocated by the radio access network for the UE's PDU session) to the user plane function, and send the UE's PDU session to the user plane function. The function activates the UE's PDU session and sets the UE's PDU session status to active. In some embodiments, the PDU session requiring downlink data transmission is not necessarily in the PDU session requested by the UE to be activated.

- For the PDU session of the failed UE and/or the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE, delete the PDU session of the UE, request deletion of the user plane function PDU session of the UE. In some embodiments, whether to continue to suspend or delete the PDU session of the UE that failed to restore depends on the reason for the failure to restore. For example, a recovery failure caused by insufficient resources on the radio access network side can continue to be suspended. For example, if the PDU session requested to be restored is unknown, the PDU session description information is inconsistent and should be deleted.

- For a PDU session that is successfully restored on the radio access network side but is neither the PDU session requested by the UE to activate nor the downlink data transmission requirement, the session management function can perform at least one of the following: suspend/release the PDU session, request the user plane management function Suspend/release the PDU session, request the radio access network to suspend/release the PDU session, and request the UE to suspend/release the PDU session.

- For the PDU session of the UE requesting suspension, the session management function may perform at least one of the following: continue to suspend the PDU session.

- For the PDU session information requested to be released, the session management function may perform at least one of the following: release the PDU session, and request the user plane function to release the PDU session.

Step 146: The session management function sends a recovery response to the access mobility management function. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, information about a failed PDU session recovery, and information about a PDU session requiring release/suspend. The information of the successfully restored PDU session may indicate the information of the successfully restored PDU session at the core network side. The information of the PDU session required to be released/suspended indicates the information of the PDU session required to be released/resumed by the session management function.

Step 147: The access mobility management function sends a recovery response to the radio access network. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, information about a failed PDU session recovery, and information about a PDU session requiring release/suspend. The information of the successfully restored PDU session may indicate the information of the successfully restored PDU session at the core network side.

- For the information of the failed PDU session, the radio access network may perform one of the following: suspend the context of the PDU session, suspend the context of the mapped radio bearer of the PDU session, release the bearer resources, save the uplink transport address of the PDU session ( That is, the user plane function is the transmission address assigned to the UE's PDU session), setting the UE's PDU session state to suspended, requesting the UE to suspend the PDU session, deleting the PDU session context, and requesting the UE to delete the PDU session.

Depending on the information on the PDU session that is required to be released/suspended, the radio access network may perform one of the following:

- Suspend/release the context of the specified PDU session,

- the radio bearer context mapped by the PDU session of the pending UE,

- release the assigned PDU session allocation or mapped radio bearer,

- Send information to the UE for a PDU session requiring release/suspend

Optionally, step 148: the radio access network sends an RRC reconfiguration message to the UE. Optionally, the message includes information about the PDU session that is required to be released/suspended.

The UE suspends/releases the specified PDU session according to the received information of the PDU session required to release/suspend.

Fourth Embodiment

The UE sends the PDU session information requested to be restored to the radio access network, the radio access network sends the PDU session information requested by the UE to restore to the core network, and the core network is based on the PDU session information requested by the UE and the PDU session information requested by the core network itself (that is, a PDU session with downlink transmission requirements) to perform PDU session recovery, and notify the radio access network of the result of the core network PDU session recovery, and the radio access network will then perform a PDU session according to the recovery result of the PDU session requested by the UE from the core network. recover. As shown in Figure 15, this embodiment specifically includes the following steps:

Step 151: The UE sends an RRC recovery request to the radio access network. Optionally, at least one of the following may be indicated in the request: information about the PDU session that the UE requests to resume.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 152: The radio access network sends a recovery request to the access mobility management function.

Optionally, at least one of the following may be indicated in the request: information about the PDU session that the UE requests to resume.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

Step 153: The access mobility management function sends a recovery request to the session management function of the UE's PDU session.

Optionally, at least one of the following may be indicated in the request: information about the PDU session that the UE requests to resume.

In addition, the request may indicate at least one of the following: PDU session information requested to be suspended, and PDU session information requested to be released.

For PDU sessions that are not part of the request for recovery, the session management function can continue to suspend or release.

- For at least one of 1. the PDU session that the UE requests to restore and 2. the PDU session that has downlink data transmission requirements, the session management function can perform at least one of the following: The downlink transport address (that is, the transport address allocated by the radio access network for the UE's PDU session) sends the user plane function, activates the UE's PDU session to the user plane function, and sets the UE's PDU session state to active. In some embodiments, the PDU session required by the downlink data transfer is not necessarily in the PDU session requested by the UE to be activated.

- For the PDU session of the UE requesting to be suspended, the session management function may perform at least one of the following: continue to suspend the PDU session of the UE.

- For the PDU session information requested to be released, the session management function may perform at least one of the following: delete the PDU session of the UE, and request the user plane function to delete the PDU session of the UE.

Step 154: The session management function sends a recovery response to the access mobility management function. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, information about a failed PDU session recovery, and information about a PDU session requiring release/suspend. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side. The information of the PDU session required to be released/suspended indicates the information of the PDU session required to be released/resumed by the session management function.

Step 155: The access mobility management function sends a recovery response to the radio access network. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, information about a failed PDU session recovery, and information about a PDU session requiring release/suspend. The information of the successfully restored PDU session indicates the information of the successful PDU session restored by the session management function on the core network side.

For a PDU session indicating successful restoration, the radio access network performs a PDU session restoration operation, which may include at least one of the following:

- resume the context of the suspended UE's PDU session,

- Resume a suspended UEPDU session mapped radio bearer (eg DRB),

- allocating or mapping radio bearers (such as DRBs) for the UE's PDU session,

- Restoring the connection between the radio access network and the core network with respect to the UE.

- For the information of the failed PDU session, the radio access network may perform one of the following: suspend the context of the PDU session, suspend the context of the mapped radio bearer of the PDU session, release the bearer resources, save the uplink transport address of the PDU session ( That is, the user plane function is the transmission address assigned to the UE's PDU session), setting the UE's PDU session state to suspended, requesting the UE to suspend the PDU session, deleting the PDU session context, and requesting the UE to delete the PDU session.

Depending on the information of the PDU session requested to be released/suspended, the radio access network may perform one of the following: suspend/release the context of the specified PDU session, suspend the context of the radio bearer mapped by the PDU session of the suspended UE, release the specified PDU Session allocation or mapping of radio bearers, sending information to the UE to release/suspend the PDU session

In some embodiments, due to the shortage of radio resources, not every PDU session requested by the UE can be allocated radio resources. For a PDU session for which the core network recovery is successful but the radio access network recovery fails, the radio access network performs at least one of the following: requesting the core network (such as access mobility management functions, session management functions, and user plane functions, etc.) to release/suspend PDU sessions in which the core network recovery succeeds but the radio access network recovery fails

Step 156 : the radio access network sends the RRC recovery to the UE. Optionally, the RRC recovery indication is at least one of the following: acknowledgment of the recovered PDU session information. In some embodiments, the PDU session included in the information confirming the restored PDU session is a PDU session that is successfully restored by both the core network and the radio access network.

The UE performs PDU session recovery according to the indicated "information confirming the recovered PDU session".

Step 157: The UE sends the RRC recovery complete to the radio access network. Optionally, at least one of the following may be indicated in the RRC recovery completion: the information of the PDU session that the UE recovers successfully, and the information of the PDU session that the UE side fails to recover.

In some embodiments, some PDU sessions may fail to recover at the UE side due to unpredictable reasons. To recover the failed PDU session on the UE side, the radio access network may perform one of the following: release/suspend the PDU session, and request the core network to release/suspend the PDU session.

Fifth Embodiment

This embodiment is a recovery operation, and the sequence of PDU recovery is still that the radio access network side and the UE recover the PDU session first, and then the core network side recovers the PDU session according to the recovery result of the PDU session between the UE and the radio access network. The advantages are: After the PDU session between the UE and the radio access network is restored, the UE can send uplink data. In this embodiment, the radio access network attempts to resume all PDU sessions suspended by the UE. As shown in Figure 16, this embodiment specifically includes the following steps:

Step 161: The UE sends an RRC recovery request to the radio access network.

The radio access network performs a PDU session recovery operation, which may include at least one of the following:

- resume the context of the suspended UE's PDU session,

- Resume a suspended UEPDU session mapped radio bearer (eg DRB),

- allocating or mapping radio bearers (such as DRBs) for the UE's PDU session,

- Restoring the connection between the radio access network and the core network with respect to the UE.

In some embodiments, due to the shortage of radio resources, not every PDU session requested by the UE can be allocated radio resources. The radio access network may preferentially resume the PDU session that the UE requests to activate. In addition, the radio access network may send information confirming the resumed PDU session to the UE.

Step 162: The radio access network sends the RRC recovery to the UE. Optionally, the RRC recovery indicates at least one of the following: information for confirming the recovered PDU session. In some embodiments, the PDU session information confirmed to be restored may be a PDU session successfully restored by the radio access side.

The UE performs PDU session recovery according to the indicated "information confirming the recovered PDU session".

Step 163: The UE sends the RRC recovery complete to the radio access network. Optionally, at least one of the following may be indicated in the RRC recovery completion: the information of the PDU session that the UE recovers successfully, and the information of the PDU session that the UE side fails to recover.

In some embodiments, some PDU sessions may fail to recover at the UE side due to unpredictable reasons. To recover the failed PDU session on the UE side, the radio access network may perform one of the following: release/suspend the PDU session, and request the core network to release/suspend the PDU session.

Step 164: The radio access network sends a recovery request to the access mobility management function.

Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The resumed PDU session information indicates that the radio access network confirms the information of the resumed PDU session between the UE and the radio access network according to the UE request.

Step 165: The access mobility management function sends a recovery request to the session management function of the UE's PDU session.

Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery.

- For a successfully restored PDU session on the radio access network side, the session management function may perform at least one of the following: restore the context of the UE's PDU session, change the downlink transmission address of the UE's PDU session (that is, the radio access network is the UE's PDU session The assigned transport address) sends the user plane function, activates the UE's PDU session to the user plane function, and sets the UE's PDU session state to active. In some embodiments, the PDU session requiring downlink data transmission is not necessarily in the PDU session requested by the UE to be activated.

- For the radio access network side to recover the failed UE's PDU session, the session management function may perform at least one of the following: continue to suspend the UE's PDU session, delete the UE's PDU session, and request the user plane function to delete the UE's PDU session. In some embodiments, whether to continue to suspend or delete the PDU session of the UE that failed to restore depends on the reason for the failure to restore. For example, a recovery failure caused by insufficient resources on the radio access network side can continue to be suspended. For example, if the PDU session requested to be restored is unknown, the PDU session description information is inconsistent and should be deleted.

Step 166: The session management function sends a recovery response to the access mobility management function. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The information of the successfully restored PDU session may indicate the information of the successfully restored PDU session at the core network side.

Step 167: The access mobility management function sends a recovery response to the radio access network. Optionally, at least one of the following may be indicated in the request: information about a successful PDU session recovery, and information about a failed PDU session recovery. The information of the successfully restored PDU session may indicate the information of the successfully restored PDU session at the core network side.

- For the information of the failed PDU session, the radio access network may perform one of the following: suspend the context of the PDU session, suspend the context of the mapped radio bearer of the PDU session, release the bearer resources, save the uplink transport address of the PDU session ( That is, the user plane function is the transmission address assigned to the UE's PDU session), setting the UE's PDU session state to suspended, requesting the UE to suspend the PDU session, deleting the PDU session context, and requesting the UE to delete the PDU session.

Optionally, step 168: the radio access network sends an RRC reconfiguration message to the UE. Optionally, the message includes information about the PDU session that is required to be released/suspended.

The UE suspends/releases the specified PDU session according to the received information of the PDU session required to release/suspend.

Sixth Embodiment

In the 5G mobile communication system, mobility management and session management are further split and reorganized, and the mobility management function in MME is attributed to AMF. The session management function in the MME and the session management functions in the SGW and PGW are integrated into SMF, and the user plane functions in SGW and PGW are integrated into AMF. To the user plane CIOT. Since there is no interface between the AMF and the UPF, if only the UE context is kept on the AMF and the UE context on the SMF is released, the recovery of the UE session on the UPF cannot be supported.

This embodiment is a PDU session suspension procedure. As shown in Figure 17, this embodiment includes the following steps:

Step 171: The radio access network decides to suspend the UE, and sends a suspend request to the access mobility management function.

Step 172: The access mobility management function sends a suspend request to the session management function of the UE's PDU session. The session management functions of the PDU sessions of different UEs may be different.

The session management function can perform at least one of the following: save the context of the PDU session of the UE, save the downlink transport address of the PDU session of the UE (that is, the transport address allocated by the radio access network for the PDU session of the UE), and send the PDU session to the UPF to deactivate the session , set the UE's PDU session state to suspended.

Step 173: The session management function sends a suspension response to the access mobility management function.

The access mobility management function can perform one of the following: save the mobility context of the UE, save the UE session related information (PDU session identifier, PDU session state, address of the session management function, slice information)

Step 174: The access mobility management function sends a suspension response to the radio access network. Optionally, the response may include at least one of the following: information about suspending the PDU session of the successful UE, and information about suspending the PDU session of the failed UE.

The access mobility management function may wait until the session management functions of all UE's PDU sessions return a suspend response and then initiate a suspend response to the radio access network.

The radio access network may perform one of the following: suspend the context of the UE's PDU session, suspend the context of the mapped radio bearer of the UE's PDU session, release bearer resources, and save the uplink transport address of the UE's PDU session (ie, the user plane function). The transport address allocated for the UE's PDU session), setting the UE's PDU session state to suspend, suspending the connection between the radio access network and the core network control plane (AMF, MME, etc.) about the UE.

In some embodiments, the radio access network performs the suspend operation only on PDU sessions that are designated to suspend successfully.

In other embodiments, the radio access network releases the failed PDU session.

Step 175: The radio access network sends an RRC suspend or RRC release message to the UE. Optionally, the message may include at least one of the following: information about the PDU session of the suspended UE, and information about the PDU session of the deleted UE.

The UE bottom layer (or the AS layer) may perform a suspend operation, including at least one of the following: suspending the UE's PDU session context, suspending the UE's PDU session mapped radio bearer context, releasing bearer resources, suspending the UE's PDU session context, The session state is set to suspend, notify the UE upper layer (or NAS layer) to suspend the PDU session context of the UE, and suspend the connection between the radio access network and the core network control plane (AMF, MME, etc.) about the UE.

In some embodiments, the radio access network performs the suspend operation only on PDU sessions that are designated to suspend.

In other embodiments, the radio access network releases the PDU session designated for deletion.

Seventh Embodiment

For a terminal in an idle state, the core network side may receive a downlink data notification about the terminal's individual PDU session. For these sessions, recovery is required to transfer data to the terminal. But there is no such information in the paging message. Then, when the terminal service requests, it does not know that there are PDU sessions that require downlink data transmission, and the activated PDU sessions requested by the terminal are less of this part of the PDU sessions. Similarly, for a terminal using the user plane CIOT, if it is in an idle state, there is no PDU session information for downlink data transmission in the paging message. If the UE requests to restore the PDU session as needed, this part of the PDU session will also be missing.

This embodiment is a paging operation/notification operation, and this embodiment is applicable to a scenario where a PDU session is processed based on a PDU session requested by the core network to be restored. As shown in Figure 18, this embodiment includes the following steps:

Step 181: When the user plane function of the core network has downlink data that needs to be transmitted, determine the PDU session information to be restored, and the user plane function of the core network sends a downlink data notification to the SMF.

Step 182: The SMF sends the downlink data notification to the AMF.

Step 183a: The AMF sends a paging message or a notification message to the radio access network, wherein the paging message carries the PDU session information requested by the core network to be restored.

Step 184: The radio access network forwards the paging message to the terminal.

Step 183b: The AMF notifies the UE of the message. Wherein, the notification message may carry the PDU session information requested by the core network to resume. In one embodiment, although the UE is in the idle state in the 3GPP access network, the UE is in the connected state in the non-3GPP access network. Therefore, the notification message including the PDU session information requested by the core network to be restored is sent to the UE through the 3GPP access network.

Step 185a: After receiving the paging message, the terminal starts the PDU session recovery process, and sends a service request message to the core network. Wherein, the message may carry the PDU session information requested by the core network to resume.

Or step 185b: after receiving the paging message, the terminal starts a PDU session recovery process, and sends an RRC recovery request message to the radio access network. Wherein, the message may carry the PDU session information requested by the core network to resume.

Among them, it is worth noting that the acquisition involved in the embodiments of the present invention may be received, configured, or known by oneself. In some embodiments, the PDU session required for data transmission may be a PDU session requiring downlink data transmission, or a PDU session receiving downlink data notification, or the like. PDU sessions with data transmission requirements are not necessarily included in the PDU session information requested for recovery. This is because the UE does not know that the network device has a PDU session for downlink data transmission when sending the information of the PDU session for requesting recovery.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk and other mediums that can store program codes.

In addition, it should be pointed out that, in the apparatus and method of the present invention, obviously, each component or each step can be decomposed and/or recombined. These disaggregations and/or recombinations should be considered as equivalents of the present invention. Also, the steps of performing the above-mentioned series of processes can naturally be performed in chronological order in the order described, but need not necessarily be performed in chronological order, and some steps can be performed in parallel or independently of each other. Those of ordinary skill in the art can understand that all or any steps or components of the method and device of the present invention can be implemented in any computing device (including a processor, storage medium, etc.) or a network of computing devices in hardware, firmware, etc. , software or a combination thereof, which can be realized by those of ordinary skill in the art using their basic programming skills after reading the description of the present invention.

Accordingly, the objects of the present invention can also be achieved by running a program or set of programs on any computing device. The computing device may be a well-known general-purpose device. Therefore, the objects of the present invention can also be achieved only by providing a program product containing program codes for implementing the method or apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any known storage medium or any storage medium developed in the future. It should also be pointed out that, in the device and method of the present invention, obviously, each component or each step can be decomposed and/or recombined. These disaggregations and/or recombinations should be considered as equivalents of the present invention. Also, the steps of executing the above-described series of processes can naturally be executed in chronological order in the order described, but need not necessarily be executed in chronological order. Certain steps may be performed in parallel or independently of each other.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications are also within the protection scope of the present invention. Inside.

Claims (47)

1. A session control method is applied to a first network unit side, and is characterized by comprising the following steps:

acquiring operation request information of packet data unit PDU session information; the operation request information includes at least one of the following information: PDU session information which is requested to be recovered by a terminal, PDU session information which is requested to be released by the terminal and PDU session information which is requested to be hung by the terminal;

carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

2. The session control method according to claim 1, wherein the step of performing PDU session processing according to the operation request information comprises at least one of:

when the operation request information is PDU session information which is requested to be recovered by the terminal, at least one of the following items is executed: carrying out recovery operation on the PDU session which is requested to be recovered by the terminal; restoring all PDU sessions suspended by the terminal; restoring all PDU sessions suspended by the terminal, and preferentially restoring the PDU session requested to be restored by the terminal when resources are insufficient;

when the operation request information is PDU session information requested to be released by a terminal, the PDU session requested to be released by the terminal is released;

and when the operation request information is PDU session information which is requested to be suspended by the terminal, the PDU session which is requested to be suspended by the terminal is subjected to suspension operation.

3. The session control method according to claim 2, wherein the step of performing a recovery operation on the PDU session comprises:

performing at least one of the following operations on the PDU session:

restoring the context of the PDU session;

recovering the radio bearer corresponding to the PDU session;

allocating and/or mapping radio bearer resources for the QoS flows of the PDU session;

restoring the connection between the first network element and the second network element with respect to the terminal.

4. The session control method according to claim 2, wherein the step of performing PDU session processing according to the operation request information further comprises at least one of:

sending PDU session information confirming recovery and/or PDU session information confirming non-recovery to the terminal;

and the number of the first and second groups,

sending PDU session recovery result information of the first network unit to a second network unit; wherein the PDU session recovery result information of the first network element comprises at least one of the following information: recovering successful PDU session information, recovering failed PDU session information, requesting released PDU session information and requesting pending PDU session information.

5. The session control method according to claim 4, comprising at least one of:

the successfully recovered PDU session information is used for indicating that the terminal and the first network unit both recover the successful PDU session;

the recovery failed PDU session information is used for indicating the terminal or the first network unit to recover the failed PDU session;

the release-requested PDU session information is used for indicating at least one of the PDU session failed to be recovered by the terminal, the PDU session failed to be recovered by the first network unit and the PDU session requested to be released by the terminal;

the suspension-requested PDU session information is used for indicating at least one of the terminal recovering the failed PDU session, the first network unit recovering the failed PDU session and the terminal requesting the suspension of the PDU session;

the PDU session information confirming recovery is used for indicating at least one of the existence of a PDU session context, the existence of a PDU session capable of allocating or mapping radio bearer resources, and the existence of the PDU session capable of recovering confirmed by both the first network element and the second network element;

the confirming the unrecoverable PDU session comprises: at least one of a PDU session for which there is no PDU session context, a PDU session for which radio bearer resources cannot be allocated or mapped, a first network element acknowledging an unrecoverable PDU session, a second network element acknowledging an unrecoverable PDU session.

6. The session control method according to claim 4, wherein after the step of sending the PDU session information confirming recovery and/or PDU session information confirming non-recovery to the terminal, the method further comprises:

receiving PDU recovery result information of the terminal fed back by the terminal; wherein, the PDU recovery result information of the terminal includes: and the terminal recovers at least one of the successful PDU session information and the failed PDU session information.

7. The session control method according to claim 4, wherein the step of sending the PDU session recovery result information of the first network element to the second network element comprises:

sending a session operation request carrying PDU session recovery result information of the first network unit to a second network unit;

and receiving PDU session recovery result information of the second network unit, which is returned by the second network unit according to the session operation request.

8. The session control method according to claim 7, wherein after the step of receiving the PDU session recovery result information of the second network element returned by the second network element according to the session operation request, further comprising:

and processing the PDU session of the terminal according to the PDU session recovery result information of the second network unit.

9. The session control method according to claim 1, wherein the step of performing PDU session processing according to the operation request information comprises:

and when the operation request information comprises PDU session information which is requested to be recovered by the terminal, the PDU session information which is requested to be recovered by the terminal is sent to a second network unit.

10. The session control method according to claim 9, wherein the step of sending the PDU session information that the terminal requests to resume to the second network element is followed by further comprising:

receiving PDU conversation recovery result information of the second network unit fed back by the second network unit according to the PDU conversation information required to be recovered by the terminal;

and processing the PDU session of the terminal according to the PDU session recovery result information of the second network unit.

11. The session control method according to claim 8 or 10, wherein the PDU session recovery result information of the second network element comprises at least one of the following information: the second network unit recovers the successful PDU session information, the second network unit recovers the failed PDU session information, the second network unit requests the recovery PDU session information, the second network unit requests the release PDU session information and the second network unit requests the suspension PDU session information.

12. The session control method according to claim 11, wherein the step of processing the PDU session of the terminal according to the PDU session recovery result information of the second network element comprises:

if the PDU session recovery result information of the second network unit is the PDU session information successfully recovered by the second network unit, when detecting that the PDU session successfully recovered by the second network unit can not be recovered at the first network unit or the terminal side, sending request information for requesting to release or suspend the PDU session to the second network unit;

if the PDU session recovery result information of the second network unit is PDU session information failed in recovery of the second network unit, at least one of the following operations is executed on the PDU session failed in recovery of the second network unit:

suspending recovery of the failed PDU session context by the second network element,

Suspending the second network element from recovering the context of the radio bearer corresponding to the failed PDU session,

Releasing the bearer resource corresponding to the PDU session failed to recover by the second network element,

Storing an uplink transport address of the PDU session for which recovery of the second network element failed,

Setting the PDU session status of the second network unit which fails to recover to be suspended,

Requesting the terminal to suspend the recovery of the failed PDU session by the second network element,

Requesting the terminal to delete the PDU session context that failed to recover the second network element,

Requesting the terminal to delete the PDU session which fails to be recovered by the second network unit;

if the PDU session recovery result information of the second network unit is the PDU session information which is requested to be recovered by the second network unit, at least one of the following operations is executed to the PDU session which is requested to be recovered by the second network unit:

restoring the context of the PDU session the second network element requests to restore,

Restoring the radio bearer corresponding to the PDU session requested to be restored by the second network element,

Allocation or mapping of radio bearer resources for the PDU session the second network element requests for recovery,

Restoring a connection with a second network element with respect to the terminal;

if the PDU session recovery result information of the second network element is the PDU session information requested to be released by the second network element, at least one of the following operations is performed on the PDU session requested to be released by the second network element:

releasing the context of the PDU session requested to be released by the second network element,

Releasing the radio bearer context corresponding to the PDU session requested to be released by the second network element,

The radio bearer resource corresponding to the PDU session requested to be released by the second network unit is released,

Sending PDU session information requested to be released by the second network unit to the terminal;

if the PDU session recovery result information of the second network unit is the PDU session information which is requested to be suspended by the second network unit, at least one of the following operations is executed to the PDU session which is requested to be suspended by the second network unit:

suspending the context of the PDU session the second network element requests to suspend,

Suspending the radio bearer context corresponding to the PDU session requested to be suspended by the second network element, releasing the radio bearer resource corresponding to the PDU session requested to be suspended by the second network element,

And sending the PDU session information which is requested to be suspended by the second network unit to the terminal.

13. A network device, applied to a first network element side, comprising:

the first acquisition module is used for acquiring operation request information of the PDU session information; the operation request information includes at least one of the following information: PDU session information which is requested to be recovered by a terminal, PDU session information which is requested to be released by the terminal and PDU session information which is requested to be hung by the terminal;

the first processing module is used for carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

14. The network device of claim 13, wherein the first processing module comprises at least one of:

a first processing sub-module, configured to, when the operation request information is PDU session information that the terminal requests to resume, perform at least one of the following: carrying out recovery operation on the PDU session which is requested to be recovered by the terminal; restoring all PDU sessions suspended by the terminal; restoring all PDU sessions suspended by the terminal, and preferentially restoring the PDU session requested to be restored by the terminal when resources are insufficient;

the second processing submodule is used for performing release operation on the PDU session requested to be released by the terminal when the operation request information is PDU session information requested to be released by the terminal;

and the third processing submodule is used for carrying out suspension operation on the PDU session requested to be suspended by the terminal when the operation request information is PDU session information requested to be suspended by the terminal.

15. The network device of claim 14, wherein the first processing module further comprises at least one of:

a first sending submodule, configured to send recovery confirmation and/or PDU session information that cannot be recovered confirmation to the terminal;

and the number of the first and second groups,

a second sending submodule, configured to send PDU session recovery result information of the first network element to a second network element; wherein the PDU session recovery result information of the first network element comprises at least one of the following information: recovering successful PDU session information, recovering failed PDU session information, requesting released PDU session information and requesting pending PDU session information.

16. The network device of claim 15, wherein the first processing module further comprises:

the first receiving submodule is used for receiving PDU recovery result information of the terminal fed back by the terminal; wherein, the PDU recovery result information of the terminal includes: and the terminal recovers at least one of the successful PDU session information and the failed PDU session information.

17. The network device of claim 13, wherein the first processing module further comprises:

and the fourth processing submodule is used for sending the PDU session information which is requested to be recovered by the terminal to the second network unit when the operation request information comprises the PDU session information which is requested to be recovered by the terminal.

18. A session control method is applied to a first network unit side, and is characterized by comprising the following steps:

acquiring operation request information of packet data unit PDU session information; the operation request information includes at least one of the following information: the second network unit requests the recovered PDU session information, the second network unit requests the release of the PDU session information and the second network unit requests the suspended PDU session information;

carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

19. The session control method according to claim 18, wherein the step of performing PDU session processing according to the operation request information comprises at least one of:

when the operation request information is PDU session information which is requested to be recovered by a second network unit, recovering the PDU session which is requested to be recovered by the second network unit;

when the operation request information is PDU session information requested to be released by a second network unit, the PDU session requested to be released by the second network unit is released;

and when the operation request information is PDU session information which is requested to be suspended by the second network unit, the PDU session which is requested to be suspended by the second network unit is suspended.

20. The session control method according to claim 18 or 19, wherein the step of performing PDU session processing according to the operation request information further comprises:

and sending the operation request information to a terminal.

21. The session control method of claim 20, wherein the step of obtaining operation request information of Packet Data Unit (PDU) session information comprises:

receiving a paging message or a notification message sent by a second network unit;

the step of sending the operation request information to the terminal includes:

sending the received paging message or notification message to the terminal;

wherein the paging message or the notification message carries at least one of information indicating that the second network unit requests the PDU session to be resumed, information indicating that the second network unit requests the PDU session to be released, and information indicating that the second network unit requests the PDU session to be suspended.

22. A network device, applied to a first network element side, comprising:

the second acquisition module is used for acquiring the operation request information of the PDU session information; the operation request information includes at least one of the following information: the second network unit requests the recovered PDU session information, the second network unit requests the release of the PDU session information and the second network unit requests the suspended PDU session information;

the second processing module is used for carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

23. The network device of claim 22, wherein the second processing module comprises at least one of:

a fifth processing sub-module, configured to, when the operation request information is PDU session information that the second network unit requests to resume, perform a resume operation on the PDU session that the second network unit requests to resume;

a sixth processing sub-module, configured to, when the operation request information is PDU session information requested to be released by a second network element, perform a release operation on the PDU session requested to be released by the second network element;

and a seventh processing sub-module, configured to perform a suspend operation on the PDU session requested to be suspended by the second network unit when the operation request information is PDU session information requested to be suspended by the second network unit.

24. The network device of claim 22 or 23, wherein the second processing module further comprises:

and the third sending submodule is used for sending the operation request information to the terminal.

25. A session control method is applied to a second network unit side, and is characterized by comprising the following steps:

acquiring operation request information of packet data unit PDU session information; the operation request information includes at least one of the following information: PDU session information requested to be recovered by the terminal, PDU session information requested to be released by the terminal, PDU session information requested to be suspended by the terminal, PDU session recovery result information of the first network unit, PDU session information requested to be recovered by the third network unit, PDU session information requested to be released by the third network unit, PDU session information requested to be suspended by the third network unit, PDU session information required by downlink data transmission and PDU session information notified by the received downlink data;

carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

26. The session control method according to claim 25, comprising at least one of:

the PDU session recovery result information of the first network element includes: recovering at least one of successful PDU session information, failed PDU session information, PDU session information requested to be released and PDU session information requested to be suspended;

the PDU session information which is requested to be recovered by the terminal is the PDU session information which is forwarded by the first network unit or sent by the terminal and is requested to be recovered by the terminal;

the PDU session information requested to be released by the terminal is the PDU session information requested to be released by the terminal and forwarded by the first network unit or sent by the terminal;

the PDU session information that the terminal requests to suspend is the PDU session information that the terminal requests to resume and is forwarded by the first network element or sent by the terminal.

27. The session control method according to claim 25 or 26, wherein the step of performing PDU session processing according to the operation request information comprises at least one of:

for the PDU session needing recovery operation, at least one of the following operations is executed:

restoring the context of the corresponding PDU session,

Sending the downlink transmission address of the corresponding PDU session to the user plane functional entity, and activating the corresponding PDU session to the user plane functional entity;

at least one of the PDU session indicated by the PDU session information requested to be released by the terminal and the PDU session indicated by the PDU session information requested to be released by the first network unit is subjected to the following operations: releasing the PDU session requested to be released by the terminal and/or the second network unit;

at least one of the PDU session indicated by the PDU session information requested to be suspended by the terminal and the PDU session indicated by the PDU session information requested to be suspended by the first network unit is subjected to the following operations: suspending the PDU session requested to be released by the terminal and/or a second network unit;

performing at least one of the following operations on the recovery-failed PDU session indicated by the PDU session recovery result information of the first network element:

suspending the context of a recovery failed PDU session,

Deleting the context of the PDU session with failed recovery,

Requesting the user plane functional entity to delete the PDU session failed to be recovered;

wherein, the PDU session needing recovery operation includes: the PDU session recovery result information of the first network unit indicates a PDU session that is successfully recovered, the PDU session indicated by the PDU session information that the terminal requests to recover, the PDU session indicated by the PDU session information that the third network unit requests to recover, the PDU session indicated by the PDU session information that has a requirement for downlink data transmission, the PDU session indicated by the PDU session information that receives a notification of downlink data, the PDU session recovery result information of the first network unit indicates a PDU session that is successfully recovered and that the third network unit requests to recover, the PDU session recovery result information of the first network unit indicates a PDU session that is successfully recovered and that has a requirement for downlink data transmission, the PDU session indicated by the PDU session recovery result information of the first network unit indicates a PDU session that is successfully recovered and that receives a notification of downlink data, and the PDU session recovery result information of the terminal requests to recover and that the PDU session recovery result information of the first network unit indicates a PDU session that is successfully recovered At least one item of (1).

28. The session control method according to claim 25, wherein after the step of performing PDU session processing according to the operation request information, the method further comprises:

generating PDU session recovery result information of the second network unit; wherein the PDU session recovery result information of the second network element comprises at least one of the following information: the second network unit recovers the successful PDU session information, the second network unit recovers the failed PDU session information, the second network unit requests the recovered PDU session information, the second network unit requests the released PDU session information, and the second network unit requests the suspended PDU session information;

and sending the PDU session recovery result information of the second network unit to the first network unit and/or sending the PDU session recovery result information of the second network unit to the terminal through the first network unit.

29. The session control method according to claim 28, comprising at least one of:

the PDU session information that the second network requests to resume includes: at least one item of PDU session information required by downlink data transmission, PDU session receiving downlink data notification and PDU session requested to be recovered by the third network unit;

the second network requests the PDU session information to be suspended including: at least one of the PDU session that the second network failed to recover, the PDU session that the first network unit succeeded in recovering but the second network failed to recover, and the PDU session that the first network unit and the terminal succeeded in recovering but the second network failed to recover;

the PDU session information requested to be released by the second network includes: at least one of the PDU session that failed to recover by the second network, the PDU session that succeeded in recovering by the first network element but failed to recover by the second network, and the PDU session that succeeded in recovering by the first network element and the terminal but failed to recover by the second network.

30. The session control method according to claim 25, wherein performing PDU session processing according to the operation request information comprises:

when the operation request information is at least one of the PDU session information requested to be recovered by the third network unit, the PDU session information requested to be released by the third network unit, the PDU session information requested to be suspended by the third network unit, the PDU session information required to be suspended by the third network unit and the PDU session information notified by the received downlink data, at least one of the PDU session information requested to be recovered by the third network unit, the PDU session information requested to be suspended by the third network unit, the PDU session information required to be suspended by the third network unit and the PDU session information notified by the received downlink data is sent to the first network unit through a paging request or a notification message.

31. A network device, applied to a second network element side, comprising:

a third obtaining module, configured to obtain operation request information of packet data unit PDU session information; the operation request information includes at least one of the following information: PDU session information requested to be recovered by the terminal, PDU session information requested to be released by the terminal, PDU session information requested to be suspended by the terminal, PDU session recovery result information of the first network unit, PDU session information requested to be recovered by the third network unit, PDU session information requested to be released by the third network unit, PDU session information requested to be suspended by the third network unit, PDU session information required by downlink data transmission and PDU session information notified by the received downlink data;

the third processing module is used for carrying out PDU session processing according to the operation request information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

32. The network device of claim 31, wherein the third processing module comprises at least one of:

an eighth processing sub-module, configured to perform, on a PDU session that needs to be recovered, at least one of the following operations:

restoring the context of the corresponding PDU session,

Sending the downlink transmission address of the corresponding PDU session to the user plane functional entity, and activating the corresponding PDU session to the user plane functional entity;

a ninth processing sub-module, configured to perform the following operations on at least one of the PDU session indicated by the PDU session information requested to be released by the terminal and the PDU session indicated by the PDU session information requested to be released by the first network element: releasing the PDU session requested to be released by the terminal and/or the second network unit;

a tenth processing sub-module, configured to perform the following operations on at least one of the PDU session indicated by the PDU session information requested to be suspended by the terminal and the PDU session indicated by the PDU session information requested to be suspended by the first network element: suspending the PDU session requested to be released by the terminal and/or a second network unit;

an eleventh processing sub-module, configured to perform, on a PDU session indicated by the PDU session recovery result information of the first network element, at least one of the following operations:

suspending the context of a recovery failed PDU session,

Deleting the context of the PDU session with failed recovery,

Requesting the user plane functional entity to delete the PDU session failed to be recovered;

wherein, the PDU session needing recovery operation includes: the PDU session recovery result information of the first network unit indicates a PDU session that was successfully recovered, the PDU session indicated by the PDU session information that the terminal requested to be recovered, the PDU session indicated by the PDU session information that the third network unit requested to be recovered, the PDU session indicated by the PDU session information that had a requirement for downlink data transmission, the PDU session indicated by the PDU session information that received a downlink data notification, the PDU session recovery result information of the first network unit indicates a PDU session that was successfully recovered and that the third network unit requested to be recovered, the PDU session recovery result information of the first network unit indicates a PDU session that was successfully recovered and that had a requirement for downlink data transmission, the PDU session indicated by the PDU session recovery result information of the first network unit indicates a PDU session that was successfully recovered and that received a downlink data notification, and the PDU session recovery result information of the terminal requested to be recovered and that the PDU session recovery result information of the first network unit indicates a successful recovery At least one item of (1).

33. The network device of claim 31, wherein the network device further comprises:

a first generating module, configured to generate PDU session recovery result information of the second network element; wherein the PDU session recovery result information of the second network element comprises at least one of the following information: the second network unit recovers the successful PDU session information, the second network unit recovers the failed PDU session information, the second network unit requests the recovered PDU session information, the second network unit requests the released PDU session information, and the second network unit requests the suspended PDU session information;

and the second sending module is used for sending the PDU session recovery result information of the second network unit to the first network unit and/or sending the PDU session recovery result information to the terminal through the first network unit.

34. The network device of claim 31, wherein the third processing module further comprises:

a twelfth processing sub-module, configured to send, to the first network unit, at least one of the PDU session information requested to be restored by the third network unit, the PDU session information requested to be suspended by the third network unit, and the PDU session information notified by the downlink data, through a paging request or a notification message, at least one of the PDU session information requested to be restored by the third network unit, the PDU session information requested to be suspended by the third network unit, and the PDU session information notified by the downlink data.

35. A session control method applied to a terminal side is characterized by comprising the following steps:

transmitting operation request information of Packet Data Unit (PDU) session information to a first network element;

receiving PDU session operation response information sent by the first network unit according to the operation request information;

carrying out PDU session processing according to the PDU session operation response information;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

36. The session control method according to claim 35, wherein the operation request information includes at least one of:

PDU session information requested by the terminal, PDU session information requested to be recovered by the first network and PDU session information requested to be recovered by the second network.

37. The session control method of claim 35, further comprising, before the step of sending operation request information for packet data unit, PDU, session information to the first network element, at least one of:

generating PDU session information requesting recovery;

receiving PDU session information which is sent by a first network unit and requests for recovery;

and receiving the PDU session information which is sent by the second network unit and requests to be recovered through the first network unit.

38. The session control method according to claim 35, wherein the PDU session operation response information comprises: confirming recovery and/or confirming PDU session information which cannot be recovered;

according to the PDU conversation operation response information, the PDU conversation processing step comprises:

and processing the PDU conversation according to the information of confirming the recovery and/or confirming the PDU conversation which can not be recovered.

39. The session control method according to claim 38, wherein the step of processing the PDU session according to the information confirming recovery and/or confirming unrecoverable PDU session comprises at least one of:

recovering the PDU session confirmed to be recovered according to the information of the PDU session confirmed to be recovered;

and releasing or suspending the unrecoverable PDU session according to the information for confirming the unrecoverable PDU session.

40. The session control method according to claim 38, wherein the step of processing the PDU session according to the information confirming recovery and/or confirming unrecoverable PDU session comprises:

generating PDU session recovery result information of the terminal after the PDU session processing and feeding back the PDU session recovery result information to the first network unit; wherein the PDU recovery result information of the terminal includes at least one of the following information: the terminal recovers the successful PDU session information, the terminal recovers the failed PDU session information, the terminal releases the successful PDU session information and the terminal hangs up PDU session information.

41. A terminal, comprising:

a third sending module, configured to send operation request information of packet data unit PDU session information to the first network element;

a second receiving module, configured to receive PDU session recovery result information of the first network element, where the PDU session recovery result information is sent by the first network element according to the operation request information;

a fourth processing module, configured to process the PDU session according to the PDU session recovery result information of the first network unit;

the PDU session information includes at least one of the following information: PDU conversation identification information, recovery indication information, suspension indication information, release indication information, PDU conversation identification bit map information and QoS flow information in the PDU conversation.

42. The terminal according to claim 41, characterized in that the terminal further comprises at least one of:

the second generation module is used for generating PDU session information requesting recovery;

a third receiving module, configured to receive PDU session information that is sent by the first network element and requests to be recovered;

and the fourth sending module is used for receiving the PDU session information which is sent by the second network unit and requests for recovery through the first network unit.

43. The terminal of claim 41, wherein the PDU session recovery result information of the first network element comprises: confirming recovery and/or confirming PDU session information which cannot be recovered;

the fourth processing module comprises:

and the thirteenth processing submodule is used for processing the PDU conversation according to the information of the PDU conversation which is confirmed to be recovered and/or can not be recovered.

44. The terminal of claim 41, wherein the fourth processing module further comprises:

the feedback submodule is used for generating PDU session recovery result information of the terminal after the PDU session processing and feeding the PDU session recovery result information back to the first network unit; wherein the PDU recovery result information of the terminal includes at least one of the following information: the terminal recovers the successful PDU session information, the terminal recovers the failed PDU session information, the terminal releases the successful PDU session information and the terminal hangs up PDU session information.

45. A network device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the session control method according to any one of claims 1 to 12, 18 to 21, 25 to 30 when executing the computer program.

46. A terminal, characterized in that the terminal comprises a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the session control method according to any one of claims 35 to 40.

47. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, realizes the steps of the session control method according to any one of claims 1 to 12, 18 to 21, 25 to 30, 35 to 40.

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