WO2012167521A1 - Procédé de traitement, entité de gestion mobile et système de service sur domaine à commutation de circuits permettant de revenir à un réseau classique - Google Patents

Procédé de traitement, entité de gestion mobile et système de service sur domaine à commutation de circuits permettant de revenir à un réseau classique Download PDF

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Publication number
WO2012167521A1
WO2012167521A1 PCT/CN2011/079587 CN2011079587W WO2012167521A1 WO 2012167521 A1 WO2012167521 A1 WO 2012167521A1 CN 2011079587 W CN2011079587 W CN 2011079587W WO 2012167521 A1 WO2012167521 A1 WO 2012167521A1
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WIPO (PCT)
Prior art keywords
user equipment
utran
indication information
pdn connection
lipa pdn
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PCT/CN2011/079587
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English (en)
Chinese (zh)
Inventor
陈中平
吴问付
张艳平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2012167521A1 publication Critical patent/WO2012167521A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, a mobility management entity, and a system for processing a circuit switched domain service back to a legacy network. Background technique
  • LIP Local IP Access
  • HeNB Home evolved Node B
  • the user equipment (UE) can directly access other IP devices in the home or enterprise network through the HeNB without traversing the user plane of the mobile operator network. Compared with the carrier's core network, this part of the service is directly The traffic is offloaded from the HeNB, thereby reducing the load and transmission costs of the core network.
  • PDN Packet Data Network
  • LIPA PDN Local IP Access Packet Data Network
  • LIPA does not support mobility, that is, there is a regional restriction.
  • the network device discovers that the UE leaves the authorized area of LIPA, the network device will release the LIPA PDN connection, which may also be called deleting or deactivating the LIPA PDN connection.
  • the CS Fallback (CSFB) technology was proposed to reuse existing Circuit Switched Domain (CS) domain services in an Evolved Packet System (EPS) network.
  • EPS Evolved Packet System
  • the user equipment is registered in the EPS network by performing the joint attachment to the Mobile Switch Center (MSC) of the circuit domain.
  • MSC Mobile Switch Center
  • the user equipment returns to the second generation mobile communication according to the requirements of the EPS network (The 2nd Generation, 2G) / The 3rd Generation (3G) network completes the CS service.
  • the embodiment of the present invention provides a method, a mobility management entity, and a system for processing a circuit switched domain service to return to a legacy network, and solves the problem that when the MME performs CSFB, the user equipment is removed when the user equipment has only one LIPA PDN connection. After the LIPA authorization zone, CSFB was forced to interrupt.
  • Embodiments of the present invention provide a method for processing a circuit switched domain service back to a legacy network, including:
  • the MME retains a LIPA PDN connection of the user equipment, the user equipment has only one LIPA PDN connection and the user equipment is in a non-LIPA 4 authorized area;
  • the MME sends indication information to the E-UTRAN, the indication information instructing the E-UTRAN to move the user equipment to other networks;
  • the MME releases the LIPA PDN connection.
  • An embodiment of the present invention further provides a mobility management entity, including:
  • a receiving module configured to receive an extended service request message sent by the user equipment, where the extended service request message is used to indicate that the CSFB service is performed;
  • a reservation module configured to reserve a LIPA PDN connection of the user equipment, the user equipment has only one LIPA PDN connection and the user equipment is in a non-LIPA 4 authorized area i or;
  • a sending module configured to send indication information to the E-UTRAN, where the indication information indicates that the E-UTRAN moves the user equipment to another network;
  • a release module that is used to release the LIPA PDN connection.
  • Embodiments of the present invention also provide a system for processing circuit switched domain services back to a conventional network. And including the E-UTRAN and the foregoing mobility management entity; when the mobility management entity sends the indication information to the E-UTRAN, instructing the E-UTRAN to move the user equipment to another network, the E-UTRAN moves the user equipment to the other network .
  • the MME when the user equipment has only one LIPA PDN connection, when the MME performs CSFB, it finds that the user equipment leaves the LIPA authorized area, and then sends the indication information to the E-by retaining the LIPA PDN connection of the user equipment.
  • UTRAN instructing to move the user equipment to another network, and then releasing the LIPA PDN connection, can ensure that before the MME sends the indication information to the E-UTRAN, the user equipment does not cause the user equipment to re-initiate the attach procedure because it is separated, thereby ensuring CSFB will not be interrupted, improving the user's business experience.
  • FIG. 1 is a schematic flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic flowchart of a method according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic flowchart of a method according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic structural diagram of a first MME according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural diagram of a second MME according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic structural diagram of a third MME according to Embodiment 4 of the present invention.
  • FIG. 7 is a schematic structural diagram of a fourth MME according to Embodiment 4 of the present invention.
  • FIG. 8 is a schematic structural diagram of a system according to Embodiment 5 of the present invention. detailed description
  • GPRS General Packet Radio Service
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • RAN Radio Access Network
  • CN Core Network
  • the CN is logically divided into a Circuit Switched Domain (CS) domain and a Packet Switched Domain (PS) domain.
  • CS Circuit Switched Domain
  • PS Packet Switched Domain
  • the CS domain mainly handles voice services
  • the PS domain mainly handles packet services.
  • the signaling plane control entity of the CS domain is a Mobile Switch Center (MSC)/Visitor Location Register (VLR), and the signaling plane control entity of the PS domain is a Serving GPRS Support Node (Serving GPRS Support Node, SGSN), SGSN and MSC/VLR can be connected through the Gs interface.
  • MSC Mobile Switch Center
  • VLR Visitor Location Register
  • 3GPP has developed a Long Term Evolution (LTE) program, and under the guidance of this evolution plan, defines the architecture of a new mobile communication network.
  • LTE Long Term Evolution
  • EPS Evolved Packet System
  • the core network of the evolved packet system network mainly includes a Mobility Management Entity (MME), a Serving Gateway (S-GW), and a Packet Data Network Gateway (P-GW). Logical functional bodies.
  • the access network of the evolved packet system network is an Evolved UMTS Territorial Radio Access Network (E-UTRAN).
  • E-UTRAN Evolved UMTS Territorial Radio Access Network
  • the evolved packet network is referred to as an E-UTRAN network, where the physical network elements in the E-UTRAN may be evolved.
  • Node B evolved Node B, eNB
  • HeNB evolved Node B
  • an architecture for connecting to CS over an E-UTRAN network is introduced.
  • the MME is connected to the MSC of the CS through the SGs interface, and the CS service is provided to the UE in the E-UTRAN network.
  • the UE first initiates an EPS mobility management (EMM) joint process in the E-UTRAN network, such as a combined attach procedure or a combined tracking area/location area update procedure ( Combined TA/LA Updating Procedure ).
  • EMM EPS mobility management
  • the MME and the MSC create an SGs association for the UE.
  • MO Mobile Originating
  • the MME instructs the E-UTRAN to switch the UE to another network, such as a 2G network or a 3G network; the UE finally returns The calling party is executed in other networks.
  • the MSC receives a Mobile Terminated (MT): First, the MSC sends a paging message to the MME through the SGs interface; second, the MME performs CS paging on the UE through the E-UTRAN network; After the CS paging message, the caller is returned from the E-UTRAN to the other network by a similar calling process.
  • MT Mobile Terminated
  • the UE accesses through the HeNB.
  • the UE can use the LIPA service to directly access other IP devices in the home or enterprise network.
  • the HeNB is configured with a local gateway (L-GW) or the HeNB is bound to an L-GW.
  • the UE accesses other IP devices in the home or enterprise network through the L-GW.
  • L-GW local gateway
  • the UE uses the LIPA service, a LIPA PDN connection needs to be established.
  • the UE leaves the authorized area of the LIPA the LIPA PDN connection needs to be released. Release of the LIPA PDN connection may also be referred to as deactivating or deleting the LIPA PDN connection.
  • the UE leaves the HeNB, for example, from the HeNB to the eNB, and the UE is considered to have left the LIP A authorized area.
  • the UE When the UE has only one LIPA PDN connection, if the UE switches from the HeNB to the eNB, whether the UE is the calling or the called, the extended service request message sent to the MME is CSFB, and the MME finds When the UE leaves the HeNB, the LIPA PDN connection is released, and the UE is separated, and the current CS service is forced to terminate, which affects the user's service experience.
  • the embodiment of the present invention solves the problem that CSFB is forced to be interrupted after the user equipment leaves the LIP A authorized area when the MME performs CSFB in the case that the user equipment has only one LIPA PDN connection, as follows: :
  • Embodiment 1 of the present invention provides a method of processing CSFB.
  • the method does not release the LIPA PDN connection temporarily when the user equipment has only one LIPA PDN connection and the user equipment is in the non-LIPA authorized area, but waits for a suitable time to release the LIPA PDN connection, ensuring that the user equipment moves to other networks. At the same time, it can guarantee the principle that LIPA PDN connection does not support mobility.
  • FIG. 1 is a schematic flowchart of a method provided in Embodiment 1, as shown in FIG. 1, the specific process is as follows:
  • the MME receives an extended service request message sent by the user equipment, and the extended service request message is used to indicate the service of the CSFB.
  • the MME retains the LIPA PDN connection of the user equipment, where the user equipment has only one LIPA PDN connection and the user equipment is in a non-LIP A authorization area;
  • the MME sends indication information to the E-UTRAN, which indicates that the E-UTRAN moves the user equipment to other networks.
  • the method is performed by the MME.
  • the extended service request message may be initiated based on the calling process or may be initiated based on the called process.
  • the user equipment is in a non-LIP A authorized area, that is, the user equipment leaves the support for the user setting.
  • the HeNB connected to the LIPA PDN may be switched to the eNB or switched to another HeNB, and so on.
  • the HeNB and the L-GW are bound together, and the HeNB can obtain the L-GW address, which is generally an IP address.
  • the HeNB reports the L-GW address to the MME.
  • the HeNB reports the L-GW address to the MME through an Initial UE message on the S1 interface.
  • the L-GW address is obtained for the first time, and the MME saves it.
  • the MME checks whether the L-GW address changes according to the saved L-GW address. If the L-GW changes, for example, moving from one HeNB to another HeNB, or not receiving an L-GW address, for example, moving from one HeNB to another, it means that the UE leaves the HeNB. In general, the eNB does not Configure or bind an L-GW.
  • the LIPA PDN connection of the user equipment is reserved.
  • the only LIPA PDN connection of the user equipment is not released.
  • the MME releases the LIPA PDN connection, and the MME separates the user equipment because only one LIPA PDN connection is released. Specifically, the MME sends a Service Reject message to the user equipment, and the message indicates implicit separation. After the user equipment receives the service rejection message, if the reason for the rejection in the message indicates implicit separation, the user equipment will re-initiate. The attach process causes CSFB to be interrupted.
  • the LIPA PDN connection of the user equipment is reserved, including one or any combination of the following manners: Method 1: setting a flag in the UE context (UE Context), for example, the LIPA PDN connection needs to be deactivated, that is, the LIPA PDN The need deactivated flag, used to indicate that the UE's LIPA PDN connection needs to be released, and retains the LIPA PDN connection indicated by the flag that needs to be released.
  • Method 1 setting a flag in the UE context (UE Context), for example, the LIPA PDN connection needs to be deactivated, that is, the LIPA PDN
  • the need deactivated flag used to indicate that the UE's LIPA PDN connection needs to be released, and retains the LIPA PDN connection indicated by the flag that needs to be released.
  • the flag is used to indicate that the LIPA PDN connection of the UE needs to be released.
  • the LIPA PDN connection is not released, but the LIPA PDN connection is released after step 103.
  • the LIPA PDN connection may also be released after receiving the UE Context Release Request message.
  • releasing the LIPA PDN connection includes: releasing a LIPA PDN connection indicated by the release flag that needs to be released.
  • releasing the LIPA PDN connection comprises: releasing the LIPA PDN connection indicated to be released after the user equipment release request message is received.
  • Manner 2 Set a timer, which is used to control the lifetime of the LIPA PDN connection and keep the LIPA PDN connection that is controlled by the timer.
  • the timer is used to control the lifetime of the LIPA PDN connection. When the timer does not expire, and there is no other release condition, for example, a certain message is received and the LIPA PDN connection is released. The LIPA PDN connection can still be reserved. When the timer expires, it indicates that the LIPA PDN should be released.
  • the LIPA PDN connection is temporarily not released; 2) when the timer does not time out, the user equipment context is released. After the message is requested, the LIPA PDN connection is released; 3) When the timer expires, the LIPA PDN connection is released.
  • releasing the LIPA PDN connection includes:
  • the indication information can be included in the message to be sent.
  • the message of this embodiment may be a UE Initial Context Setup Request message or a User Equipment Context Modification Request message (UE Context Modification).
  • the indication information may specifically be that the CS service returns a traditional network indication (CS Fallback) Indicator) Information or other information used to instruct E-UTRAN to move user equipment to other networks.
  • CS Fallback traditional network indication
  • the method further includes: the E-UTRAN moving the user equipment to another network.
  • the other network may be a 2G network or a 3G network.
  • other networks capable of performing circuit switched domain services may also be present, which are not limited herein.
  • the E-UTRAN may initiate a Packet Switched Domain Switching (PS HO) process to move the user equipment to other networks, and may also initiate the non-PS HO to move the user equipment to other The internet.
  • PS HO Packet Switched Domain Switching
  • the E-UTRAN moves the user equipment to other networks in PS HO mode
  • the E-UTRAN sends a Handover Required message to the MME.
  • the MME receives the handover request message of the E-UTRAN
  • the LIPA PDN connection does not support handover from the source network to the target network due to the LIPA-based processing principle. Therefore, the E-UTRAN handover request is rejected, and the MME sends a handover rejection ( Handover Reject) message, after which the UE needs to return to other networks autonomously.
  • Handover Reject handover rejection
  • the handover request message sent by the MME may include indication information indicating that the E-UTRAN moves the user equipment to the other network in a non-PS HO manner, and is used to indicate the E-UTRAN. Move user devices to other networks in a non-PS HO manner.
  • the indication information in step 103 may indicate that the E-UTRAN uses the user equipment as a non-PS HO. The way to move to other networks.
  • sending the indication information to the E-UTRAN, the indication information indicating that the E-UTRAN moves the user equipment to the other network comprises: sending the indication information to the E-UTRAN, the indication information is used to indicate that the E-UTRAN will be the user The device moves to other networks in a non-PS HO manner.
  • the indication information specifically includes:
  • the CS Fallback without PS HO Indicator information is used to instruct the E-UTRAN to move the user equipment to other networks in a non-PS HO manner.
  • the CS Fallback Indicator is used to instruct the E-UTRAN to move the user equipment to other networks, and the mode information is used to indicate that the CSFB is performed in a manner other than the PS HO. or,
  • E-RAB E-UTRAN Radio Access Bearer
  • the E-RAB information includes a radio access bearer list, and the list records contents such as ID and QoS corresponding to each E-RAB.
  • LIP A indication information such as a relationship identifier (Correlation ID), is used to indicate the E-RAB. Is the E-RAB associated with LIPA PDN.
  • the E-UTRAN senses that only one E-RAB needs to be created, and the E-RAB is the LIPA PDN-related E-RAB, and the CSFB of the user equipment is performed in a non-PS HO manner.
  • the indication information indicating that the E-UTRAN moves the user equipment to the other network in a non-PS HO manner may be included in the UE Initial Context Setup Request message, UE Context Modification Request message (UE Context Modification) ) or switch the Handover Reject message.
  • the method further includes: E-UTRAN moves the user equipment to other networks in a non-PS HO manner.
  • the release of the LIPA PDN connection may be performed after receiving the user equipment context release request message.
  • the LIPA PDN connection when the user equipment has only one LIPA PDN connection, when the MME performs the CSFB and finds that the user equipment leaves the LIP A authorized area, the LIPA PDN connection is not immediately released, but the indication information is sent to the E first.
  • - UTRAN instructs the E-UTRAN to move the user equipment to other networks, and then releases the LIPA PDN connection, which ensures that the indication information is sent to the MME to Prior to E-UTRAN, the user equipment does not cause the user equipment to re-initiate the attach procedure because it is separated, thereby ensuring that the CSFB is not interrupted, thereby improving the user's service experience.
  • Embodiment 2 is a schematic flow chart of a method provided by Embodiment 2 of the present invention. As shown in Figure 2, the specific process is as follows:
  • the MME receives the paging request (Paging Request) message sent by the MSC, and the current UE is in an idle (Idle) state, that is, the UE does not have a signaling connection with the MME, and the MME sends a paging message to the UE, in particular,
  • the core domain (CN Domain) in the call message is set to CS to indicate that the current page is a CS page.
  • the UE sends an extended service request message to the MME.
  • the UE when the UE senses that the CS is called, or the UE currently has a calling service, the UE sends an extended service request message to the MME, where the extended service request message includes a service type cell, and the service type cell It is set to "Calling CSFB (mobile originating CS fallback)", which is used to indicate the calling service that is currently CSFB, or the service type cell is set to "Called CSFB (mobile terminating CS fallback)", which is used to indicate that it is currently CSFB's called business.
  • the UE has only one LIPA PDN connection.
  • the MME reserves a LIPA PDN connection of the user equipment.
  • the MME learns that the current service type is called the CSFB service or the called CSFB service. If the MME finds that the UE has left the HeNB, the LIPA PDN connection is not released.
  • Not releasing the LIPA PDN connection here means temporarily not releasing the LIPA PDN connection and waiting for a suitable time to release the LIPA PDN connection.
  • the LIPA PDN connection of the user equipment is reserved, including one or any combination of the following manners: Method 1: setting a flag in the context of the UE, for example, the LIPA PDN connection needs to be deactivated, that is, the LIPA PDN need deactivated flag,
  • the LIPA PDN connection used to indicate the UE needs to be released, and the LIPA PDN connection indicated by the flag that needs to be released is retained.
  • the flag is used to indicate that the LIPA PDN connection of the UE needs to be released, that is: the LIPA PDN connection is not temporarily released, but the LIPA PDN connection is released after step 204, where the reference here is after step 204. Releasing the LIPA PDN connection does not mean that the LIPA PDN connection is released as soon as step 204 is completed.
  • the LIPA PDN connection may also be released after receiving the user equipment context release request message.
  • Manner 2 Set a timer, which is used to control the lifetime of the LIPA PDN connection and keep the LIPA PDN connection that is controlled by the timer.
  • the timer is used to control the lifetime of the LIPA PDN connection. When the timer does not expire, and there is no other release condition, for example, a certain message is received and the LIPA PDN connection is released. The LIPA PDN connection can still be reserved. When the timer expires, it indicates that the LIPA PDN should be released.
  • the LIPA PDN connection is temporarily not released; 2) when the timer does not time out, the user equipment context is released. After the message is requested, the LIPA PDN connection is released; 3) When the timer expires, the LIPA PDN connection is released.
  • the MME Since the MME does not release the only LIPA PDN connection of the UE, the MME does not separate the UE, so the MME does not return a Service Reject message indicating the implicit separation to the UE, and the UE does not re-initiate.
  • the attachment process caused the CS service to be interrupted.
  • the MME sends a user equipment initialization context setup request message/user equipment context modification request message to the E-UTRAN;
  • the MME when the MME does not establish an S1 connection with the E-UTRAN, the MME sends a User Equipment Initialization Context Setup Request message to the E-UTRAN.
  • the MME sends the user equipment context to the E-UTRAN.
  • Modifying the request message, the user equipment initialization context establishment request message or the user equipment context modification request message includes indication information, such as CSFB indication information, that is, a CS Fallback Indicator message, for indicating that the E-UTRAN moves the UE Go to the 2G/3G network.
  • E-UTRAN sends a user equipment context modification request message / user equipment context modification response message to the MME;
  • step 206 is performed, otherwise step 208 is performed.
  • the E-UTRAN sends a handover request message to the MME.
  • the E-UTRAN sends a Handover Required message to the MME.
  • the MME sends a handover reject message to the E-UTRAN.
  • the MME sends a Handover Reject message to the E-UTRAN for rejecting the E-UTRAN handover request.
  • the indication information may be included in the handover rejection message, for example, the non-packet switched domain handover mode performs CSFB indication information, that is, CS Fallback.
  • the indication information is used to indicate that the E-UTRAN moves the UE to the 2G/3G network in a non-PS HO manner, and the specific form of the indication information is not limited herein.
  • Step 208 does not depend on step 206, step 207, that is, when the E-UTRAN moves the UE to the 2G/3G network in a non-PS HO manner, step 206 and step 207 are skipped, and step 208 is directly executed.
  • the E-UTRAN moves the UE to the 2G/3G network in a non-PS HO manner, for example, the E-UTRAN triggers the Radio Resource Control (RRC) Connection Release (RRC Connection Release) procedure between the UE and the UE from the E.
  • RRC Radio Resource Control
  • RRC Connection Release Radio Resource Control
  • the UE performs a CS service.
  • the UE returns from the E-UTRAN to the 2G/3G network, and performs a related processing procedure of the CS service, for example, the UE returns a Paging Response message to the MSC.
  • the E-UTRAN sends a user equipment context release request message to the MME.
  • the step 210 and the step 208 have no timing relationship, and the step 210 may be started simultaneously with the step 208, or may be performed after the step 208 is started.
  • the MME releases the LIP A PDN connection.
  • Step 211 may be opened before step 208.
  • Step 211 and step 210 also have no timing relationship.
  • Step 211 may start execution before step 210 or start execution after step 210.
  • step 211 is performed after step 210 to ensure that the LIPA PDN connection is released after CSFB begins execution.
  • the flag when a flag is set in the context of the UE, the flag is used to indicate that the LIPA PDN connection of the UE needs to be released, and the LIPA PDN connection indicated by the flag needs to be released; preferably, may be received After the user equipment context release request message, the LIPA PDN connection indicated by the flag that needs to be released is released.
  • this timer is used to control the LIPA PDN.
  • the LIPA PDN connection is released after receiving the user equipment context release request message; or, 2) when the timer expires, the LIPA is released. PDN connection.
  • the LIPA PDN connection is not immediately released, but the E-UTRAN is first executed.
  • the CSFB related operation moves the UE to the 2G/3G network, and then releases the LIPA PDN connection, which ensures that before the MME sends the indication information to the E-UTRAN, the user equipment does not cause the user equipment to re-initiate the attach procedure because it is separated, thereby ensuring that the user equipment does not initiate the attach procedure due to the separation.
  • CSFB will not be interrupted, improving the user's business experience.
  • FIG. 3 is a schematic flow chart of a method according to Embodiment 3 of the present invention. As shown in Figure 3, the specific process is as follows:
  • the MME sends a CS page to the UE.
  • the MME receives the paging request (Paging Request) message sent by the MSC, and the current UE is in an idle (Idle) state, that is, the UE does not have a signaling connection with the MME, and the MME sends a paging message to the UE, in particular,
  • the core domain (CN Domain) in the call message is set to CS to indicate that the current page is a CS page.
  • the UE sends an extended service request message to the MME.
  • the UE when the UE senses that the CS is called, or the UE currently has a calling service, the UE sends an extended service request message to the MME, where the extended service request message includes a service type cell, and the service type cell It is set to "Calling CSFB (mobile originating CS fallback)", which is used to indicate the calling service that is currently CSFB, or the service type cell is set to "Called CSFB (mobile terminating CS fallback)", which is used to indicate that it is currently CSFB's called business.
  • the UE has only one LIPA PDN connection.
  • the MME reserves a LIPA PDN connection of the user equipment.
  • the MME learns that the current service type is called the CSFB service or the CSFB industry. If the MME finds that the UE has left the HeNB, the LIPA PDN connection is not released at this time.
  • Not releasing the LIPA PDN connection here means temporarily not releasing the LIPA PDN connection and waiting for a suitable time to release the LIPA PDN connection.
  • the LIPA PDN connection of the user equipment is reserved, including one or any combination of the following manners: Method 1: setting a flag in the context of the UE, for example, the LIPA PDN connection needs to be deactivated, that is, the LIPA PDN need deactivated flag, The LIPA PDN connection used to indicate the UE needs to be released, and the LIPA PDN connection indicated by the flag that needs to be released is retained.
  • the flag is used to indicate that the LIPA PDN connection of the UE needs to be released, that is: the LIPA PDN connection is not temporarily released, but the LIPA PDN connection is released after step 304 (referred to hereafter after step 304) Releasing the LIPA PDN connection does not mean that the LIPA PDN connection is released as soon as step 304 is completed.
  • the LIPA PDN connection may be released after receiving the user equipment context release request message.
  • Manner 2 Set a timer, which is used to control the lifetime of the LIPA PDN connection and keep the LIPA PDN connection that is controlled by the timer.
  • the timer is used to control the lifetime of the LIPA PDN connection. When the timer does not expire, and there is no other release condition, for example, a certain message is received and the LIPA PDN connection is released. The LIPA PDN connection can still be reserved. When the timer expires, it indicates that the LIPA PDN should be released.
  • the LIPA PDN connection is temporarily not released; 2) when the timer does not time out, the user equipment context release request is received. After the message, the LIPA PDN connection is released; 3) When the timer expires, the LIPA PDN connection is released.
  • the MME Since the MME does not release the only LIPA PDN connection of the UE, the MME does not separate the UE, so the MME does not return a Service Reject message indicating the implicit separation to the UE, and the UE does not re-initiate the attachment. The process caused the CS business to be interrupted. 304: The MME sends a user equipment initialization context setup request message/user equipment context modification request message to the E-UTRAN;
  • the user equipment initialization context setup request message/user equipment context modification request message includes indication information, which is used to instruct the E-UTRAN to move the user equipment to the 2G/3G network in a non-PS HO manner.
  • indication information may include:
  • the CS Fallback without PS HO Indicator message is used to instruct the E-UTRAN to move the user equipment to the 2G/3G network in a non-PS HO manner.
  • the CS Fallback Indicator is used to instruct the E-UTRAN to move the user equipment to the 2G/3G network, and the mode information is used to indicate that the CSFB is performed in a manner other than the PS HO. or,
  • E-RAB E-UTRAN Radio Access Bearer
  • the E-RAB information includes a radio access bearer list, and the list records contents such as ID and QoS corresponding to each E-RAB; LIP A indication information, such as a relationship identifier, Correlation ID, for indicating the E-RAB Is the E-RAB associated with LIPA PDN.
  • the E-UTRAN senses that only one E-RAB needs to be created, and the E-RAB is the LIPA PDN-related E-RAB, and the CSFB of the user equipment is performed in a non-PS HO manner.
  • indication information can be used to instruct the E-UTRAN to move the user equipment to the 2G/3G network in a non-PS HO manner.
  • the MME when the UE is in the idle state, the MME sends a user equipment initialization context setup request message to the E-UTRAN.
  • the MME sends a user equipment context modification request message to the E-UTRAN, and the user equipment initializes the context establishment.
  • the request message or user equipment context modification request message contains indication information for instructing the E-UTRAN to move the UE to the 2G/3G network in a non-PS HO manner.
  • the E-UTRAN sends a user equipment context modification request message/user equipment context modification response message to the MME.
  • the E-UTRAN learns that the UE moves to the 2G/3G network in the non-PS HO mode after the step 304, the E-UTRAN does not send the handover request message to the MME, thereby saving network resources and improving the user equipment to move to the 2G.
  • the effect of the efficiency of the /3G network is not limited to the E-UTRAN.
  • E-UTRAN moves the UE to the 2G/3G network in a non-PS HO manner
  • the E-UTRAN moves the UE to the 2G/3G network in a non-PS HO manner, for example, the E-UTRAN triggers the Radio Resource Control (RRC) Connection Release (RRC Connection Release) procedure between the UE and the UE from the E.
  • RRC Radio Resource Control
  • - UTRAN network moves to 2G/3G network, specifically, if both UE and network support "RRC connection release with multi-cell system information for reselection to 2G/3G (RRC connection release with redirection and Multi Cell System Informatin to 2G /3G) " , then E-UTRAN triggers "RRC connection release with redirection to 2G/3G", and ⁇ 1 corresponds to at least one physical cell interface, information, and cell
  • the system information informs the UE that the UE can quickly return to the 2G/3G network according to the information, access a suitable cell, and establish an air interface connection.
  • the UE performs a CS service.
  • the UE returns from the E-UTRAN to the 2G/3G network, and performs a related process of the CS service, for example, the UE returns a Paging Response message to the MSC.
  • E-UTRAN sends a user equipment context release request message to the MME
  • the step 308 and the step 306 have no timing relationship, and the step 308 can be started simultaneously with the step 306, or can be executed after the step 306 is started.
  • step 309 has no timing relationship with step 306, and step 309 can be opened before step 306. There is also no timing relationship between step 309 and step 308. Step 309 may begin execution before step 308 or begin execution after step 308.
  • step 309 is performed after step 308 to ensure that the LIPA PDN connection is released after CSFB begins execution.
  • the flag when a flag is set in the context of the UE, the flag is used to indicate that the LIPA PDN connection of the UE needs to be released, and the LIPA PDN connection indicated by the flag needs to be released; preferably, may be received After the user equipment context release request message, the LIPA PDN connection indicated by the flag that needs to be released is released.
  • a timer is set for the UE's LIPA PDN connection, which is used to control the lifetime of the LIPA PDN connection, 1) when the timer has not timed out, after the user equipment context release request message is received, the timer is released.
  • Non-PS HO mode performs CSFB related operations to move the UE to the 2G/3G network, and then release the LIPA PDN connection, which ensures that the user equipment does not cause the user equipment to be re-initiated because it is separated before the MME sends the indication information to the E-UTRAN.
  • the attach process is initiated to ensure that CSFB is not interrupted, improving the user's business experience.
  • FIG. 4 is a schematic structural diagram of a mobility management entity provided by this embodiment. As shown in FIG. 4, the mobility management entity 400 specifically includes:
  • the receiving module 401 is configured to receive an extended service request message sent by the user equipment.
  • the retaining module 402 is configured to reserve a LIPA PDN connection of the user equipment, where the user equipment has only one LIP A PDN connection and the user equipment is in a non-LIP A authorized area;
  • the sending module 403 is configured to send the indication information to the E-UTRAN, where the indication information indicates that the E-UTRAN moves the user equipment to another network; Release module 405: for releasing the LIPA PDN connection.
  • the reservation module 402 retains the LIPA PDN connection of the user equipment after receiving the extended service request message, and the sending module 403 sends the indication information to the E-UTRAN after the reservation module 402 retains the LIPA PDN connection of the user equipment.
  • the release module 405 releases the LIPA PDN connection after the sending module 403 sends the indication information to the E-UTRAN.
  • the reservation module 402 includes:
  • the marking module 402a configured to set a flag in the context of the user equipment, the flag is used to indicate that the LIPA PDN connection needs to be released;
  • the first reservation module 402b is configured to retain the LIPA PDN connection that needs to be released as indicated by the flag.
  • the release module 405 is specifically configured to release the LIPA PDN connection indicated by the mark that needs to be released.
  • the reservation module 403 includes:
  • the timer module 402aa is configured to set a timer, which is used to control the lifetime of the LIPA PDN connection;
  • the second reservation module 402bb is configured to reserve the LIPA PDN connection during the lifetime.
  • the releasing module 405 is specifically configured to release the LIPA PDN connection when the timer expires.
  • the releasing module 405 is specifically configured to release the LIPA PDN connection after receiving the user equipment context release request message when the timer has not timed out.
  • the sending module 403 is specifically configured to send a user equipment initialization context establishment request message or a user equipment context modification request message, where the user equipment initialization context establishment request message or the user equipment context modification request message includes indication information, where the indication information is used. Instruct E-UTRAN to move the user equipment to other networks.
  • the sending module 403 is specifically configured to send indication information, where the indication information is used to indicate that the E-UTRAN moves the user equipment to other networks in a non-PS HO manner.
  • the sending module 403 is specifically configured to send the indication information to the E-UTRAN, where the indication information includes CS Fallback without PS HO Indicator information, where the CS Fallback without PS HO Indicator information indicates that the E-UTRAN uses the user equipment as a non-PS HO. Move to other networks.
  • the sending module 403 is specifically configured to send the indication information to the E-UTRAN, where the indication information includes CS Fallback Indicator information and mode information, where the mode information is used to indicate that the E-UTRAN moves the user equipment to the non-PS HO manner.
  • the indication information includes CS Fallback Indicator information and mode information, where the mode information is used to indicate that the E-UTRAN moves the user equipment to the non-PS HO manner.
  • Other networks are specifically configured to send the indication information to the E-UTRAN, where the indication information includes CS Fallback Indicator information and mode information, where the mode information is used to indicate that the E-UTRAN moves the user equipment to the non-PS HO manner.
  • the sending module 403 is specifically configured to send the indication information to the E-UTRAN, where the indication information includes CS Fallback Indicator information, E-UTRAN radio access bearer (E-RAB M message and LIPA indication information;
  • the information is used to indicate that 5-1-8 is related to the 1 ⁇ ???01 ⁇ connection, and the user equipment is to be moved to other networks in a non-PS HO manner.
  • the sending module 403 is specifically configured to send a user equipment initialization context establishment request message, a user equipment context modification request message, or a handover rejection message, where the user equipment initialization context establishment request message, the user equipment context modification request message, or the handover rejection message includes
  • the indication information is used to instruct the E-UTRAN to move the user equipment to other networks in a non-PS HO manner.
  • the mobility management entity 400 provided by this embodiment further includes: a first receiving module 404, configured to receive a user equipment context release request message; the first receiving module receives a user equipment context release request After the message, the release module 405 performs the release of the LIPA.
  • the other network in this embodiment may be a 2G network or a 3G network.
  • other networks that can perform circuit domain services may be used, which is not limited herein.
  • the MME when the MME performs the CSFB, the MME does not immediately release the LIPA PDN connection after the user equipment leaves the LIPA authorized area, but first indicates E. - UTRAN performs CSFB related operations to move the UE to other networks, and then releases the LIPA PDN connection, which ensures that before the mobility management entity sends the indication information to the E-UTRAN, the user equipment does not cause the user equipment to re-initiate the attached flow because it is separated. Cheng, thus ensuring that CSFB will not be interrupted, improving the user's business experience.
  • This embodiment provides a system for processing a circuit switched domain service to return to a traditional network. As shown in FIG. 8, the system includes:
  • the MME 501 is the mobility management entity (MME) of any one of the embodiments 4; the MME is configured to receive an extended service request message sent by the user equipment, where the extended service request message is used to indicate that the circuit switched domain service is performed. Returning to the legacy network service; when the MME 501 sends the indication information to the E-UTRAN 502 indicating that the E-UTRAN 502 moves the user equipment to the other network, the E-UTRAN 502 moves the user equipment to the other network.
  • MME mobility management entity
  • the MME 501 sends the indication information to the E-UTRAN 502, indicating that the E-UTRAN 502 moves the user equipment to other networks in a non-PS HO manner
  • the E-UTRAN 502 moves the user equipment to other networks in a non-PS HO manner.
  • the other network in this embodiment may be a 2G or a 3G network.
  • Other technologies may be used as the technology evolves.
  • the MME when the user equipment has only one LIPA PDN connection, when the MME performs CSFB, it finds that the user equipment leaves the LIP A authorized area, and does not immediately release the LIPA PDN connection, but first indicates E- The UTRAN performs CSFB-related operations to move the UE to other networks, and then releases the LIPA PDN connection, which ensures that before the MME sends the indication information to the E-UTRAN, the user equipment does not cause the user equipment to re-initiate the attach procedure because it is separated, thereby ensuring that the user equipment re-initiates the attach procedure.
  • CSFB will not be interrupted, improving the user's business experience.
  • the MME when the user equipment has only one LIPA PDN connection, when the MME performs the CSFB, it finds that the user equipment leaves the LIPA authorized area, and does not immediately release the LIPA PDN connection, but first Instructing the E-UTRAN to perform CSFB related operations to move the UE to other networks, and then releasing the LIPA PDN connection, can ensure that the user equipment does not cause the user equipment to re-initiate the attach procedure because the MME sends the indication information to the E-UTRAN. , thus ensuring that CSFB will not be interrupted, improving the user's business experience. Further, MME uses non-PS HO The way instructs the E-UTRAN to perform CSFB related operations to move the UE to other networks, improving the efficiency of the user equipment switching to other networks.
  • modules in the mobility management entity in the embodiment can be distributed in the mobility management entity of the embodiment according to the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de traitement, une entité de gestion mobile (MME) et un système de service sur domaine à commutation de circuits permettant de revenir à un réseau classique. Le procédé comprend les étapes au cours desquelles : une MME reçoit un message de demande de service d'extension envoyé par un équipement d'abonné ; la MME maintient la connexion de réseau de données public par accès IP local (LIPA PDN) de l'équipement d'abonné, l'équipement d'abonné n'ayant qu'une seule connexion LIPA PDN et se situant dans une zone autre qu'une zone d'autorisation d'accès IP local (LIPA) ; la MME envoie des informations d'indication à un réseau évolué (E-UTRAN) d'accès radio terrestre de système de télécommunications mobiles universelles, les informations d'indication indiquant que le réseau E-UTRAN bascule l'équipement d'abonné sur un autre réseau ; puis la MME libère la connexion LIPA PDN. Le procédé peut assurer que l'équipement d'abonné ne sera pas contraint de relancer un flux de pièces jointes, du fait de sa séparation, avant que la MME envoie les informations d'indication au réseau E-UTRAN, ce qui garantit que le CSFB ne sera pas interrompu et améliore l'expérience que l'utilisateur a du service.
PCT/CN2011/079587 2011-07-06 2011-09-13 Procédé de traitement, entité de gestion mobile et système de service sur domaine à commutation de circuits permettant de revenir à un réseau classique Ceased WO2012167521A1 (fr)

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PCT/CN2011/079587 Ceased WO2012167521A1 (fr) 2011-07-06 2011-09-13 Procédé de traitement, entité de gestion mobile et système de service sur domaine à commutation de circuits permettant de revenir à un réseau classique

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