CN102006643A - Signaling optimization method and system for idle mode signaling reduction (ISR) functional deactivation executed by joint node - Google Patents

Abstract

The present invention discloses a signaling optimization method and system for deactivating the ISR function of a joint node: the first serving gateway (S-GW) deletes the current user terminal (UE) stored by itself according to the delete bearer request sent by the joint node Bearer information: the first S-GW triggers the tunnel and bearer deletion to the packet data gateway (P-GW). Through the present invention, the interoperation between the joint node and the S-GW can be simplified.

Description

Signaling optimization method and system for joint node to perform ISR function deactivation

technical field

The present invention relates to the technical field of communication, in particular to a signaling optimization method and system for a joint node to apply an idle mode signaling reduction (ISR) function.

Background technique

In order to maintain the competitiveness of the third generation mobile communication system in the communication field, the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) standard working group is working on the research of the Evolved Packet System (EPS, Evolved Packet System).

The EPS system structure is shown in Figure 1, mainly including Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network) and Evolved Packet Core Network (EPC, Evolved Packet Core). EPC can support users from Global System for Mobile Communications (GSM, Global System for Mobile Communications) / Enhanced Data Rate GSM Evolution (EDGE, Enhanced Data Rate for GSM Evolution) wireless access network (GERAN, GSM EDGE radio access network) and Universal Terrestrial Radio Access Network (UTRAN, Universal Terrestrial Radio Access Network) access.

In EPC, it mainly includes home subscriber data server (HSS, Home Subscriber Server), mobility management entity (MME, Mobility Management Entity), serving gateway (S-GW, Serving Gateway), packet data network gateway (P-GW, PDN Gateway) and Serving GPRS Technical Support Node (SGSN, Serving GPRS Support Node), wherein:

HSS: Home Subscriber Data Server, which is the permanent storage location of user subscription data, located in the home network of user subscription;

MME: Mobility Management Entity, which is the storage location of user subscription data in the current network, is responsible for the management of non-access stratum (NAS, Non-Access Stratum) signaling from the user terminal (UE) to the network, and the tracking of users in idle mode , paging management function and bearer management;

S-GW: serving gateway, which is the gateway from EPC to E-UTRAN, responsible for the user plane bearer from UE to EPC, data caching in terminal idle mode, the function of initiating service requests on the network side, legal interception, packet data routing and forwarding functions ;

P-GW: Packet data network gateway, which is the gateway from the EPS system to the external network, responsible for IP address allocation, charging functions, packet filtering, policy application and other functions of UE;

SGSN: Serving GPRS Support Node is the service support point for GERAN or UTRAN users to access the EPC network. It is similar to MME in function and is responsible for UE location update, paging management and bearer management.

When the coverage area where the UE is located changes, for example, when moving from a radio access technology (RAT, RadioAccess Technology) coverage area to another RAT coverage area, the UE discovers that it has entered an unregistered area by monitoring the broadcast channel, In order to ensure the continuity of services between the UE and the EPC core network, the UE needs to register in the coverage area of the new RAT, so the UE will initiate inter RAT tracking area update (TAU, Tracking Area Update) or routing area update (RAU, Routing Area Update )process. For dual-mode UEs located in overlapping areas of UTRAN/GERAN coverage area and E-UTRAN coverage area, or in adjacent areas, it may be due to frequent movement between the two coverage areas, or signal strength in the overlapping area, etc. As a result, the UE frequently initiates TAU or RAU procedures in the two registration areas, which will impose a heavy burden on the bearer of the air interface. Therefore, in order to reduce the air interface signaling between the UE and the EPC core network in the EPS system, a function of Idle mode Signaling Reduction (ISR, Idle mode Signaling Reduction) is introduced. After activating the ISR function, a UE with both UTRAN/GERAN and E-UTRAN access functions can simultaneously register with the MME and SGSN. In this way, the UE with the ISR function activated will not frequently initiate TAU or RAU procedures in the adjacent or overlapping areas of the two coverage areas, thereby reducing unnecessary air interface signaling and saving precious air interface resources. In order to ensure the normal use of the ISR function, the MME and the SGSN need to store the context information of the UE respectively, and the S-GW needs to keep the bearer information of the UE under two different radio access technologies.

A joint node, also called a combo node, is a special physical node generated during network evolution. It integrates the functions of SGSN and MME, converts the interface between two network elements into an internal interface, such as interface S3 in Figure 1, shares user data and physical memory, and can reduce the number of information interactions between network elements. Combo nodes are easy to deploy for network upgrades and can reduce the signaling interaction delay between network elements. Most operators will adopt this method when deploying EPS systems.

Combo node application of ISR function has more advantages than application of ISR function in distributed deployment scenarios. In order to support ISR function, EPC core network needs to save UE context information (including mobility context and bearer context) on SGSN and MME at the same time. ). When the ISR activation, deactivation, and bearer synchronization process are initiated, the message transmission between the SGSN and the MME will be increased. For the Combo node, it integrates the SGSN and the MME on a unified physical node, and the use of the internal S3 interface can be reduced. Interoperation between SGSN and MME, including information exchange.

The ISR function cannot be maintained due to reasons such as UE shutdown, network logout, and S-GW change (that is, the ISR function is deactivated). The EPC core network needs a mechanism to ensure the release of useless UE context information and bearer information, and synchronize UE and EPC core information. The ISR status of the network-side mobility management unit (MME, SGSN) to prevent waste of information resources and process errors caused by out-of-sync ISR status.

Currently, in the deployment of Combo node applications, the operation process of deactivating the ISR function when the S-GW changes is shown in Figure 2, where the old MME inside the Combo node is bound to the old SGSN with the ISR function.

Step 201, because the location of the UE has changed and registered to a new MME/SGSN (the new MME and the new SGSN are bound with the ISR function), the new MME/SGSN may reselect a new S-GSN based on network topology, protocol type, etc. The GW serves the user. In this case, the standard protocol stipulates that the ISR function bound between the old MME and the old SGSN cannot be maintained. In order to keep the user service continuous, during the TAU/RAU process, context information needs to be exchanged between the new MME/SGSN and the old MME/SGSN. Through this process, the old MME/SGSN can know the S- GW has changed.

When the old MME/SGSN knows that the S-GW serving the UE has changed, the current old MME or old SGSN will record its own ISR status as ISR function deactivation, and send a delete bearer request to the old S-GW, requesting The old S-GW releases useless bearer information. At this time, because the ISR function cannot be maintained, the current old MME or old SGSN adds a bearer deletion indication in the delete bearer request message, and notifies the old S-GW to initiate a call to another old mobility management unit (MME or SGSN) inside the Combo node. Delete bearer request. If the current old mobility management unit is the MME, another old mobility management unit is the SGSN bound with the MME with the ISR function.

In steps 202-203, the old S-GW deletes the bearer information related to the current old MME or old SGSN according to the delete bearer request; The own ISR status is recorded as ISR function deactivation.

Step 204, if the bearer deletion request received by the old S-GW has a bearer deletion indication, it will initiate a bearer deletion request to another old mobility management unit (MME or SGSN), and locally delete the Bearer information related to the mobility management unit.

In step 205, another old mobility management unit (MME or SGSN) returns a delete bearer response to the old S-GW after locally deleting the bearer information and context information about the UE.

Step 206: After all the bearer information related to the UE on the old S-GW is deleted, a delete bearer request is sent to the P-GW to delete the tunnel and bearer information between the S-GW and the P-GW.

In step 207, the P-GW returns a delete bearer response to the S-GW, confirming that the bearer information of the tunnel segment has been deleted.

The above mechanism is not optimized for the ISR application in the case of combo node deployment. When the S-GW reversely triggers the deactivation of the ISR function of the mobility management unit, the signaling interaction between the combo node and the S-GW is added: that is, it needs to be initiated to the combo node Another internal mobility management unit requests to delete a bearer, which makes the interoperation between the Combo node and the S-GW more complicated.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a signaling optimization method and system for the joint node to perform ISR function deactivation, which can simplify the interoperation between the joint node and the S-GW.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a signaling optimization method for joint nodes to perform ISR function deactivation, the method comprising:

The first serving gateway S-GW deletes the bearer information of the current user terminal UE stored by itself according to the delete bearer request sent by the joint node;

The first S-GW triggers tunnel and bearer deletion to the packet data gateway P-GW.

Wherein, the joint node includes: a first mobility management unit and a second mobility management unit;

When the first mobility management unit is a mobility management entity MME, the second mobility management unit is a serving general packet radio technical support node SGSN; when the first mobility management unit is an SGSN, the second mobility management unit is 2. The mobility management unit is the MME.

The first mobility management unit in the joint node sends a delete bearer request to the first S-GW, specifically:

The third mobility management unit sends a context request to the first mobility management unit according to the routing area update request or the tracking area update request sent by the UE, and acquires the context information of the UE;

The first mobility management unit feeds back the context information to the third mobility management unit through a context response;

The third mobility management unit selects the second S-GW to serve the user after obtaining the context information of the UE, and notifies the first mobility management unit that the S-GW serving the UE has changed through context confirmation;

The first mobility management unit records its idle mode signaling reduction ISR state as ISR function deactivation according to the context confirmation, and sends a delete bearer request to the first S-GW.

When the first mobility management unit and the second mobility management unit share a set of UE context information, the method further includes:

When the first mobility management unit learns that the S-GW serving the UE has changed, the first mobility management unit and the second mobility management unit simultaneously record their own ISR status as deactivation of the ISR function.

The UE sends a routing area update request or a tracking area update request to the third mobility management unit, specifically:

When the UE moves to a new routing area, the radio network controller RNC sends the routing area update request to the third mobility management unit;

Or, when the UE moves to a tracking area outside the tracking area list stored by itself, the base station sends the tracking area update request to the third mobility management unit.

When the third mobility management unit is the MME, the first mobility management unit is the MME; when the third mobility management unit is the SGSN, the first mobility management unit is the SGSN.

The first S-GW deletes the bearer information of the current UE stored by itself, specifically:

When the first S-GW does not record that the ISR function of the joint node has been activated, it determines that the first mobility management unit is located in the ISR In the joint node whose function has been activated, delete the bearer information of the UE stored by itself.

The first S-GW deletes the bearer information of the current UE stored by itself, specifically:

When the first S-GW records that the ISR function of the joint node has been activated, according to the bearer tunnel identifier carried in the delete bearer request, when determining that the bearer delete request comes from the joint node, delete the UE bearer information.

The bearer information of the UE includes: bearer information related to the first mobility management unit and the second mobility management unit.

The first S-GW triggers the tunnel and bearer deletion to the packet data gateway P-GW, specifically:

After the first S-GW deletes the bearer information of the UE, it sends a delete bearer request to the P-GW; indication of tunnel and bearer information, delete the tunnel and bearer information between the first S-GW and itself, and return a delete bearer response to the first S-GW.

After the P-GW returns a delete bearer response to the first S-GW, the method further includes:

After the first S-GW confirms the deletion of the tunnel and bearer information between itself and the P-GW according to the delete bearer response returned by the P-GW, it notifies the first mobility management unit of the bearer information of the UE and the first S-GW through the delete bearer response. All tunnel and bearer information between the S-GW and P-GW are deleted.

When the first mobility management unit and the second mobility management unit jointly use a set of UE context information, and the first mobility management unit knows the bearer information of the UE and the tunnel between the first S-GW and the P-GW and After all bearer information is deleted, the method further includes: the joint node completes the deactivation of the ISR function;

When the first mobility management unit and the second mobility management unit each use a set of UE context information, and the first mobility management unit knows the bearer information of the UE and the tunnel between the first S-GW and the P-GW and After all bearer information is deleted, the method further includes: the first mobility management unit informs the second mobility management unit to delete the UE context information stored by itself through a logout notification, and the joint node completes the deactivation of the ISR function.

The present invention also provides a signaling optimization system for the joint node to apply the ISR function, the system includes: the joint node, the first S-GW and the P-GW, wherein,

The joint node is configured to send a delete bearer request to the first S-GW;

The first S-GW is configured to delete the bearer information of the current UE stored by itself according to the delete bearer request; and is also used to trigger tunnel and bearer deletion to the P-GW;

The P-GW is configured to perform tunnel and bearer deletion from the first S-GW to itself.

The joint node includes a first mobility management unit; the system further includes: a third mobility management unit, a UE and a second S-GW;

The third mobility management unit is configured to select a second S-GW to serve the UE according to the routing area update request or the tracking area update request sent by the UE, and notify the first mobility management unit that the UE is The serving S-GW changes;

Correspondingly, the first mobility management unit is configured to record its own ISR state as deactivation of the ISR function when learning that the S-GW serving the UE has changed, and send a delete message to the first S-GW. Bearer request.

The federated node further includes a second mobility management unit;

When the second mobility management unit and the first mobility management unit share a set of UE context information, and the first mobility management unit learns that the S-GW serving the UE has changed, the second mobility management unit The second mobility management unit is used to record its own ISR status as deactivation of the ISR function.

The first S-GW is further configured to notify the first mobility management unit of the bearer information of the UE and the first S-GW when the P-GW completes the tunnel from the first S-GW to itself and bearer deletion. - All tunnel and bearer information between GW and P-GW are deleted;

Correspondingly, when the second mobility management unit and the first mobility management unit each use a set of UE context information, the second mobility management unit deletes the UE according to the deregistration notification sent by the first mobility management unit The context information of the UE stored by itself.

In the signaling optimization scheme for applying the ISR function of the joint node in the present invention, when the old S-GW does not record that the ISR function of the joint node has been activated, the bearer deletion request sent by the first old mobility management unit to the old S-GW carries A cause value indicating the deactivation of the ISR function of the Combo node, so that the old S-GW can directly delete the bearer information of the UE stored by itself (including bearer information related to the first and second old mobility management units) according to the cause value; When the old S-GW records that the ISR function of the joint node has been activated, the old S-GW can directly delete the UE's stored information when it determines that the bearer deletion request comes from the joint node based on the bearer tunnel identifier carried in the bearer deletion request. The bearer information includes bearer information related to the first and second old mobility management units), so that the old S-GW does not need to initiate a delete bearer request to the second old mobility management unit, which simplifies the old S-GW and Combo Signaling interaction between nodes.

Description of drawings

Figure 1 is a schematic diagram of the structure of the EPS system;

FIG. 2 is a schematic diagram of an operation flow diagram of deactivating the ISR function when the S-GW is changed in the prior art Combo node application;

FIG. 3 is a schematic flowchart of a signaling optimization method for performing ISR function deactivation by a joint node in the present invention;

4 is a schematic diagram of signaling interaction in Embodiment 1 of the SGSN initiating the ISR function deactivation operation in the Combo node of the present invention;

FIG. 5 is a schematic diagram of signaling interaction in Embodiment 1 of the MME-initiated ISR function deactivation operation in the Combo node of the present invention;

FIG. 6 is a signaling interaction diagram between network elements when the Combo node of the present invention activates the ISR function;

7 is a schematic diagram of signaling interaction in Embodiment 2 of the SGSN initiating the ISR function deactivation operation in the Combo node of the present invention;

FIG. 8 is a schematic diagram of signaling interaction in Example 2 of the MME initiating the ISR function deactivation operation in the Combo node of the present invention;

FIG. 9 is a schematic structural diagram of a signaling optimization system in which a joint node applies an ISR function according to the present invention.

Detailed ways

The technical solutions of the present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

The process flow of the signaling optimization method for Combo node application ISR function of the present invention is shown in Figure 3, including:

In step 301, the first S-GW deletes the bearer information of the current UE stored by itself according to the bearer delete request sent by the joint node.

In step 302, the first S-GW triggers tunnel and bearer deletion to the P-GW.

In the present invention, the joint node includes a first mobility management unit and a second mobility management unit. When the first mobility management unit is MME, the second mobility management unit is SGSN; when the first mobility management unit is SGSN, the second mobility management unit is 2. The mobility management unit is the MME. In addition, the optimization process of the present invention is also applied to the third mobility management unit. When a routing area update or a tracking area update is initiated for the UE, the radio network controller (RNC, Radio Network Controller) or the base station selects one for the UE. Mobility management unit; compared with the first mobility management unit and the second mobility management unit, the third mobility management unit can be called a new mobility management unit, then the first and second mobility management units The unit is called the Legacy Mobility Management Unit.

In addition, the above-mentioned first S-GW is the S-GW that provides services for the UE before the UE initiates the routing area update or the tracking area update, and after the UE initiates the routing area update or the tracking area update, the above-mentioned new mobility management unit needs A second S-GW is selected to serve the UE for reselection. Therefore, the second S-GW is a new S-GW relative to the first S-GW, and the first S-GW is an old S-GW.

Next, the solution shown in FIG. 3 of the present invention will be described through specific embodiments.

FIG. 4 is a schematic diagram of signaling interaction in Embodiment 1 of the ISR function deactivation operation initiated by the SGSN in the Combo node, including:

In step 401, the UE initiates a routing area update request to the new SGSN.

If the UE moves to a new routing area, it will initiate a routing area update request, and the radio network controller (RNC, Radio Network Controller) will route the routing area update request to the new SGSN. The UE sets the temporary user identification information reported to the new SGSN according to the value of the temporary identification (TIN, Temporary Identity used in Next update) used in the next update, and carries it in the routing area update request.

Step 402, the new SGSN sends a context request to the old SGSN in the Combo node.

The new SGSN finds the old SGSN in the Combo node according to the temporary user identification information reported by the UE, and sends a context request to obtain the context information of the UE.

Step 403, the old SGSN returns a context response to the new SGSN.

The old SGSN in the Combo node feeds back context information such as the user's permanent identity, authentication parameters, old S-GW address and tunnel identity, and user EPC core network capabilities to the new SGSN through the context response.

Step 404, the new SGSN returns a context confirmation to the old SGSN.

The new SGSN re-selects a new S-GW to serve the user based on reasons such as network topology and network protocol type, and the existing technology will not be described here; in this case, the new SGSN will indicate the change of the S-GW through context confirmation Inform the old SGSN in the Combo node.

Step 405, the old SGSN sends a delete bearer request to the old S-GW, and the request carries a cause value for instructing the combo node to deactivate the ISR function.

When the old SGSN in the Combo node learns that the S-GW serving the UE has changed through the context confirmation, the old SGSN records its own ISR status as the deactivation of the ISR function, and at the same time sends a delete bearer request to the old S-GW, It carries a cause value, which is used to instruct the combo node to deactivate the ISR function, so as to inform the old S-GW that the old SGSN is located in the combo node whose ISR function has been activated. The old S-GW deletes the locally stored bearer information of the UE (including the bearer information related to the old SGSN and the old MME) according to the deactivation cause value of the ISR function of the combo node, and does not need to report to another mobility management inside the combo node. The unit (here the old MME) sends a delete bearer request. In this way, the interoperability between the combo node and the S-GW is simplified.

Step 406, the old S-GW sends a bearer deletion request to the P-GW.

After all the bearer information about the UE in the old S-GW is deleted, a delete bearer request is sent to the P-GW. The delete bearer request in this step does not carry the reason value for deactivating the ISR function of the joint node. The delete bearer request can Inform the P-GW that the tunnel and bearer information between the S-GW and the P-GW need to be deleted. Specifically, an indication can be carried in the delete bearer request as needed to inform the P-GW to delete the tunnel between the S-GW and itself. tunnel and bearer information.

In step 407, the P-GW returns a delete bearer response to the old S-GW.

The delete bearer response is used to confirm to the old S-GW that the bearer information of the segment of the tunnel has been deleted.

Step 408, the old S-GW sends a delete bearer response to the old SGSN.

The old S-GW replies to the old SGSN in the Combo node with a delete bearer response, and informs the old SGSN of the bearer information related to the ISR function of the Combo node (the bearer information of the UE, and the tunnel between the old S-GW and the P-GW and bearer information) have all been deleted.

Step 409, the old SGSN sends a logout notification to the old MME.

When the old SGSN and the old MME each use a set of UE context information, the old SGSN in the Combo node informs the old MME in the Combo node to delete the UE context information through a deregistration notification (by sending a deregistration notification through an internal interface). Complete ISR function deactivation.

If the SGSN and MME inside the Combo node share a set of UE context information, then when the old SGSN learns that the S-GW serving the UE has changed, the old MME and the old SGSN will simultaneously record their own ISR status as ISR function deactivation, If the shared context information of the UE is not deleted, the notification operation of the internal interface is not required. Then in step 408, when the old SGSN learns that all bearer information related to the ISR function of the Combo node has been deleted, the joint node completes the deactivation of the ISR function.

Therefore step 409 is optional.

Step 410, complete the subsequent routing area update process.

Here is the existing process and will not be repeated here.

FIG. 5 is a schematic diagram of signaling interaction in Embodiment 1 of the MME-initiated ISR function deactivation operation in the Combo node, including:

In step 501, the UE initiates a tracking area update request to the new MME.

If the UE moves to a tracking area outside the tracking area list stored by itself, the UE needs to initiate a tracking area update request, and the base station will route the tracking area update request to the new MME. The UE sets the temporary user identification information reported to the new MME according to the TIN value, and carries it in the tracking area update request.

Step 502, the new MME sends a context request to the old MME in the combo node.

The new MME finds the old MME in the combo node according to the temporary user identification information reported by the UE, and sends a context request to obtain the context information of the UE.

Step 503, the old MME returns a context response to the new MME.

The old MME in the Combo node feeds back context information such as the user's permanent ID, authentication parameters, old S-GW address and tunnel ID, and user EPC core network capabilities to the new MME through the context response.

Step 504, the new MME returns context confirmation to the old MME.

The new MME re-selects a new S-GW to serve the user based on the context information of the UE and based on reasons such as network topology and protocol type. This is the existing technology and will not be described in detail here; in this case, the new MME confirms through the context Inform the old MME in the Combo node of the S-GW change indication.

Step 505, the old MME sends a delete bearer request to the old S-GW, and the request carries a cause value for instructing the combo node to deactivate the ISR function.

When the old MME in the Combo node learns that the S-GW serving the UE has changed through the context confirmation, the old MME records its own ISR status as the deactivation of the ISR function, and at the same time sends a delete bearer request to the old S-GW, It carries a cause value, which is used to instruct the deactivation of the ISR function of the Combo node. The old S-GW deletes the locally stored bearer information of the UE (including the bearer information related to the old SGSN and the old MME) according to the deactivation cause value of the ISR function of the combo node, and does not need to report to another mobility management inside the combo node. The unit (here, the old SGSN) sends a delete bearer request.

Step 506, the old S-GW sends a bearer delete request to the P-GW.

This step is the same as step 406 and will not be repeated here.

In step 507, the P-GW returns a delete bearer response to the old S-GW.

This step is the same as step 407, and will not be repeated here.

Step 508, the old S-GW sends a delete bearer response to the old MME.

The old S-GW replies to the old MME in the combo node with a delete bearer response, informing the old MME of the bearer information related to the ISR function of the combo node (the bearer information of the UE, and the tunnel and bearer information) have all been deleted.

Step 509, the old MME sends a deregistration notification to the old SGSN.

The processing of this step is the same as step 409, and will not be repeated here.

Step 509 is also optional.

Step 510, complete the subsequent routing area update process.

Here is the existing process and will not be repeated here.

Figure 6 shows the signaling interaction diagram between network elements when the Combo node activates the ISR function, including:

In step 601, the UE sends a tracking area or routing area update request to the MME in the combo node or the SGSN.

If the UE moves to a tracking area outside the tracking area list stored by itself, or to a new routing area, the UE will initiate a tracking area or routing area update request; correspondingly, the base station or RNC will update the tracking area or routing area The request is routed to the MME or SGSN in a Combo node. The UE sets the temporary user identification information reported to the MME or SGSN according to the TIN value, and carries it in the tracking area or routing area update request.

Step 602, the current MME or SGSN sends a context request to another SGSN or MME in the Combo node.

The MME finds the SGSN in the Combo node according to the temporary user identification information reported by the UE, and obtains the context information of the UE;

The SGSN finds the MME in the Combo node according to the temporary user identification information reported by the UE, and acquires the context information of the UE.

This step is based on the fact that the UE has been attached to the EPC core network and the context information of the UE is stored in the MME or SGSN at the EPC core network side.

In step 603, another SGSN or MME in the Combo node returns a context response to the current MME or SGSN.

Another SGSN or MME in the Combo node feeds back information such as the user's permanent ID, authentication parameters, S-GW address and tunnel ID, and user EPC core network capabilities to the current MME or SGSN through the context response.

Step 604, the current MME or SGSN returns a context confirmation to another SGSN or MME in the Combo node.

When the current MME or SGSN determines that the ISR function can be activated according to the ISR activation conditions, the current MME or SGSN activates its own ISR function, and carries the ISR activation indication of the Combo node in the context confirmation, and sends it to another SGSN or MME, at this time another SGSN or MME inside the combo node also activates its own ISR function, and the ISR activation inside the combo node is completed; meanwhile, the current MME or SGSN will retain the context information of the UE. Wherein, judging whether the ISR function can be activated is an existing standard procedure, which will not be repeated here.

Step 605, the current MME or SGSN sends a bearer modification request to the S-GW.

If the ISR function inside the combo node is activated, the current MME or SGSN will carry a cause value in the bearer modification request, which is used to indicate the activation of the ISR of the combo node. At this time, when the S-GW receives the bearer modification request, it records the activation information of the ISR function of the Combo node in itself according to the cause value, that is, saves the cause value: ISR activation of the Combo node in the bearer context information of the UE generated by itself.

When the S-GW serving the UE does not change (the S-GW serving the UE will not change during the ISR activation process of the joint node), according to the needs of the network, you can choose whether to perform steps 606-607: S- The GW sends the current UE location information to the P-GW through the bearer modification request; the P-GW returns a bearer modification response to the S-GW to confirm receipt of the UE location information, and then executes step 608 . The location information of the UE may be reported to the current MME or SGSN through the tracking area or routing area update request in step 601, and then reported to the S-GW through the bearer modification request in step 505.

In step 608, the S-GW returns a bearer modification response to the current MME or SGSN.

Corresponding to the bearer modification request in step 605, the S-GW returns a bearer modification response to the current MME or SGSN to confirm that the ISR function of the Combo node has been activated, and saves the bearer information of the UE under the two radio access technologies (including the correspondence between the MME and the SGSN). bearer information).

Step 609, complete the follow-up tracking area or routing area update process.

Through this process, the UE can be informed that the ISR function of the Combo node has been activated, and the UE will reset the TIN value according to the ISR activation status.

7 is a schematic diagram of signaling interaction in Embodiment 2 of the SGSN initiating the ISR function deactivation operation in the Combo node, including:

In step 701, when the ISR function of the combo node is activated, record the activation information of the ISR function of the combo node in the old S-GW using the method shown in FIG. 6 . The processing of this step corresponds to the processing of step 605 in FIG.

The processing of steps 702 to 711 is the same as the processing of steps 401 to 410, and will not be repeated here.

It should be pointed out that in step 405, the delete bearer request sent by the old SGSN to the old S-GW carries the cause value indicating the deactivation of the ISR function of the Combo node, so as to inform the old S-GW that the old SGSN is located in the ISR function activated In the Combo node, the old S-GW needs to delete the locally stored bearer information of the UE (including the bearer information corresponding to the old MME and the old SGSN) according to the above-mentioned cause value; The bearer request does not carry the reason value indicating the deactivation of the ISR function of the Combo node. The old S-GW only needs to delete the bearer tunnel identifier in the bearer request to determine that the request comes from the Combo node, because the old S-GW in step 701 The activation information of the ISR function of the Combo node has been recorded, that is, it has been known that the ISR function of the Combo node has been activated. Therefore, the old S-GW can directly delete the locally stored bearer information of the UE (including the information corresponding to the old MME and the old SGSN) bearer information), there is no need to send a delete bearer request to the old MME in the Combo node, which simplifies the interoperation between the Combo node and the S-GW.

FIG. 8 is a schematic diagram of signaling interaction in Embodiment 2 of the MME-initiated ISR function deactivation operation in the Combo node, including:

In step 801, when the ISR function of the combo node is activated, record the activation information of the ISR function of the combo node in the old S-GW using the method shown in FIG. 6 . The processing of this step corresponds to the processing of step 605 in FIG.

The processing of steps 802 to 811 is the same as the processing of steps 501 to 510, and will not be repeated here.

It should be pointed out that the delete bearer request sent by the old MME to the old S-GW in step 505 carries a cause value indicating that the ISR function of the combo node is deactivated, so as to inform the old S-GW that the old MME is located in In the Combo node whose ISR function has been activated, the old S-GW needs to delete the bearer information of the UE stored locally (including the bearer information corresponding to the old MME and the old SGSN) according to the above cause value; - The delete bearer request sent by the GW does not carry the reason value indicating the deactivation of the ISR function of the Combo node. The old S-GW only needs to determine that the request comes from the Combo node by deleting the bearer tunnel identifier in the bearer request, because step 801 The old S-GW has recorded the activation information of the ISR function of the Combo node, that is, it has learned that the ISR function of the Combo node has been activated. Therefore, the old S-GW can directly delete the locally stored bearer information of the UE (including the old MME bearer information corresponding to the old SGSN), there is no need to send a delete bearer request to the old SGSN in the Combo node, which simplifies the interoperation between the Combo node and the S-GW.

In order to realize the above-mentioned signaling optimization method, the present invention also provides a signaling optimization system in which the joint node applies the ISR function. As shown in FIG. 9, the system includes: the joint node 10, the first S-GW 20 and the P-GW

30, of which,

The joint node 10 is configured to send a delete bearer request to the first S-GW 20;

The first S-GW 20 is used to delete the bearer information of the current UE stored by itself according to the delete bearer request; it is also used to trigger the tunnel and bearer deletion to the P-GW 30;

The P-GW 30 is configured to perform tunnel and bearer deletion from the first S-GW 20 to itself.

The joint node 10 includes a first mobility management unit 11; the system further includes: a third mobility management unit 40, a UE 50 and a second S-GW 60;

The third mobility management unit 40 is configured to select the second S-GW 60 to serve the UE 50 according to the routing area update request or the tracking area update request sent by the UE 50, and notify the first mobility management unit 11 of The S-GW served by UE 50 changes;

Correspondingly, the first mobility management unit 11 is configured to record its own ISR state as the deactivation of the ISR function when it is known that the S-GW serving the UE 50 changes, and send a delete bearer message to the first S-GW 20. ask.

The joint node 10 further comprises a second mobility management unit 12;

When the second mobility management unit 12 and the first mobility management unit 11 share a set of context information of the UE 50, and the first mobility management unit 11 learns that the S-GW serving the UE 50 changes, the second mobility The management unit 12 is configured to record its own ISR state as the deactivation of the ISR function.

The first S-GW 20 is further used to notify the first mobility management unit 11 of the bearer information of the UE 50 and the first S-GW 20 when the P-GW 30 completes the tunnel and bearer deletion from the first S-GW 20 to itself The tunnel and bearer information between P-GW 30 and P-GW 30 are all deleted;

Correspondingly, when the second mobility management unit 12 and the first mobility management unit 11 respectively use a set of context information of the UE 50, the second mobility management unit 12 deletes itself according to the logout notification sent by the first mobility management unit 11. Stored context information of the UE 50.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (16)

1. an association node is carried out the signaling optimization method of ISR function deexcitation, it is characterized in that this method comprises:

The first gateway S-GW deletes the beared information of active user's terminal UE of self storing according to the deleting bearing request that association node sends;

A described S-GW is toggled to tunnel and the deleting load-bearing of packet data gateway P-GW.

2. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 1, it is characterized in that, comprise in the described association node: first mobility management unit and second mobility management unit;

When described first mobility management unit was Mobility Management Entity MME, described second mobility management unit was service universal grouping wireless service technology support node SGSN; When described first mobility management unit was SGSN, described second mobility management unit was MME.

3. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 2, it is characterized in that first mobility management unit in the described association node sends the deleting bearing request to a described S-GW, is specially:

Routing Area Update request or tracing section updating request that the 3rd mobility management unit sends according to UE send context request to described first mobility management unit, obtain the contextual information of UE;

Described first mobility management unit feeds back to described the 3rd mobility management unit by context response with described contextual information;

Described the 3rd mobility management unit is served for it for the user selects the 2nd S-GW after obtaining the contextual information of UE, and confirms to inform that by context described first mobility management unit is that the S-GW of UE service changes;

Described first mobility management unit confirms that according to described context the idle pulley signaling minimizing ISR state recording with self is the deexcitation of ISR function, and sends the deleting bearing request to a described S-GW.

4. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 3, it is characterized in that, when described first mobility management unit and second mobility management unit shared overlapped the contextual information of UE, this method further comprised:

Described first mobility management unit learns that described first mobility management unit and second mobility management unit were the deexcitation of ISR function with the ISR state recording of self simultaneously when the S-GW that serves for UE changed.

5. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 3, it is characterized in that UE sends Routing Area Update request or tracing section updating request to the 3rd mobility management unit, is specially:

When UE moves to new route district, described Routing Area Update request is sent to described the 3rd mobility management unit by radio network controller (RNC);

Perhaps, when UE moves to tracking area outside the tracking area tabulation of self storage, described tracing section updating request is sent to described the 3rd mobility management unit by the base station.

6. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 5, it is characterized in that when described the 3rd mobility management unit was MME, described first mobility management unit was MME; When described the 3rd mobility management unit was described SGSN, described first mobility management unit was SGSN.

7. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 6, it is characterized in that, the beared information of the current UE of described S-GW deletion self storage is specially:

When the ISR function that a described S-GW does not write down described association node has activated, cause value according to the association node ISR function deexcitation of carrying in the described deleting bearing request, judge that described first mobility management unit is arranged in the described association node that the ISR function has activated, and delete the beared information of the UE that self stores.

8. carry out the signaling optimization method of ISR function deexcitation according to the described association node of claim 6, it is characterized in that, the beared information of the current UE of described S-GW deletion self storage is specially:

When the ISR function that a described S-GW has write down described association node has activated,, when judging described deleting bearing request, delete the beared information of the UE of self storage from described association node according to the bearing tunnel sign of carrying in the described deleting bearing request.

9. according to the signaling optimization method of claim 7 or 8 described association nodes execution ISR function deexcitations, it is characterized in that the beared information of described UE comprises: the beared information that described first mobility management unit is relevant with second mobility management unit.

10. according to the signaling optimization method of claim 7 or 8 described association nodes execution ISR function deexcitations, it is characterized in that a described S-GW is toggled to tunnel and the deleting load-bearing of packet data gateway P-GW, is specially:

After the beared information of described S-GW deletion UE, send the deleting bearing request to described P-GW; Described P-GW deletes a described S-GW and tunnel between self and beared information according to the tunnel between deletion the one S-GW and the P-GW and the indication of beared information in the described deleting bearing request, and returns the deleting bearing response to a described S-GW.

11. the signaling optimization method according to the deexcitation of the described association node execution of claim 10 ISR function is characterized in that described P-GW is after a S-GW returns the deleting bearing response, this method further comprises:

After deleting bearing response confirmation self that a described S-GW returns according to P-GW and the tunnel between the P-GW and the beared information deletion, notify the beared information of the first mobility management unit UE and tunnel and the beared information between a S-GW and the P-GW all to delete by the deleting bearing response.

12. the signaling optimization method according to the deexcitation of the described association node execution of claim 11 ISR function is characterized in that,

When the contextual information of UE is overlapped in the common use one of first mobility management unit and second mobility management unit, and first mobility management unit knows that this method further comprises: described association node is finished the deexcitation of ISR function after the beared information and tunnel between a S-GW and the P-GW and the whole deletions of beared information of UE;

When first mobility management unit and second mobility management unit are used the contextual information of a cover UE separately, and first mobility management unit is known after the beared information and tunnel between a S-GW and the P-GW and the whole deletions of beared information of UE, this method further comprises: the contextual information that described first mobility management unit is informed the UE of second mobility management unit deletion self storage by notice of cancellation, described association node is finished the deexcitation of ISR function.

13. an association node is used the signaling optimization system of ISR function, it is characterized in that this system comprises: association node, a S-GW and P-GW, wherein,

Described association node is used for sending the deleting bearing request to a described S-GW;

A described S-GW is used for deleting the beared information of the current UE of self storing according to described deleting bearing request; Also be used to be toggled to tunnel and the deleting load-bearing of described P-GW;

Described P-GW is used to carry out tunnel and the deleting load-bearing of a described S-GW to self.

14. the signaling optimization system according to the described association node application of claim 13 ISR function is characterized in that described association node comprises first mobility management unit; This system further comprises: the 3rd mobility management unit, UE and the 2nd S-GW;

Described the 3rd mobility management unit is used for Routing Area Update request or tracing section updating request according to the UE transmission, serves for it for UE selects the 2nd S-GW, and informs that described first mobility management unit is that the S-GW that UE serves changes;

Accordingly, described first mobility management unit is used for when the S-GW that is known as UE service changes, and is the deexcitation of ISR function with self ISR state recording, and sends the deleting bearing request to a described S-GW.

15. the signaling optimization system according to the described association node application of claim 14 ISR function is characterized in that described association node further comprises second mobility management unit;

When described second mobility management unit and described first mobility management unit shared overlapped the contextual information of UE, and when the S-GW that described first mobility management unit is known as UE service changed, the ISR state recording that described second mobility management unit is used for self was the deexcitation of ISR function.

16. the signaling optimization system according to claim 14 or 15 described association nodes application ISR functions is characterized in that,

A described S-GW is further used for, and executes a described S-GW to the tunnel of self with during deleting load-bearing at described P-GW, notifies the beared information of the first mobility management unit UE and tunnel and the beared information between a S-GW and the P-GW all to delete;

Accordingly, when described second mobility management unit and described first mobility management unit are used the contextual information of a cover UE separately, the contextual information of the UE that the notice of cancellation deletion that second mobility management unit sends according to described first mobility management unit self is stored.

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