WO2016026118A1 - Procédé et dispositif de traitement de radiorecherche pour repli sur commutation de circuits (csfb) en liaison descendante - Google Patents

Procédé et dispositif de traitement de radiorecherche pour repli sur commutation de circuits (csfb) en liaison descendante Download PDF

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Publication number
WO2016026118A1
WO2016026118A1 PCT/CN2014/084905 CN2014084905W WO2016026118A1 WO 2016026118 A1 WO2016026118 A1 WO 2016026118A1 CN 2014084905 W CN2014084905 W CN 2014084905W WO 2016026118 A1 WO2016026118 A1 WO 2016026118A1
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Prior art keywords
paging
tmsi
mme
message
msc
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PCT/CN2014/084905
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English (en)
Chinese (zh)
Inventor
舒林
李章原
陈璟
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480036834.6A priority Critical patent/CN105637954B/zh
Priority to PCT/CN2014/084905 priority patent/WO2016026118A1/fr
Publication of WO2016026118A1 publication Critical patent/WO2016026118A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a paging circuit processing method and device for a Circuit Switched Fallback (CSFB). Background technique
  • Evolved Packet System is the 3rd Generation Partnership Project (3GPP) in the second generation (The Second Generation, 2G) mobile communication network (ie GSM/EDGE: Global) System of Mobile Communication/Enhanced Data Rate for GSM Evolution, Global System for Mobile Communications/Enhanced Data Rate GSM Evolution; GSM: Global System for Mobile, Global Mobile Communications, and The Third Generation (3G) Mobile Communications
  • the network ie UMTS: Universal Mobile Telecommunications System, Universal Mobile Telecommunications System
  • the EPS network includes an Evolved Universal Mobile Telecommunication System Territorial Radio Access Network (E-UTRAN) and an Evolved Packet Core Network (EPC).
  • E-UTRAN Evolved Universal Mobile Telecommunication System
  • EPC Evolved Packet Core Network
  • the EPS network can only provide packets. Packet Switched (PS) service.
  • PS Packet Switched
  • CSFB Circuit Switching Back
  • SMS over SGs Short Message Service over SGs
  • CSFB technology enables user equipment (User Equipment, UE for short) under E-UTRAN coverage.
  • CS Circuit Switched
  • the E-UTRAN is dropped back to the CS domain of the 2G/3G network to complete the service processing.
  • CS Circuit Switched
  • the SMS over SGs technology allows the UEs residing under the E-UTRAN to reuse the existing CS. Domain to implement CS short message Transmission.
  • UEs residing in E-UTRAN and supporting CSFB and/or SMS over SGs need to initiate a joint registration procedure to achieve simultaneous registration to the EPC network PS domain and the 2G/3G network CS domain. After successful joint registration, the CSFB service of the uplink and downlink and the short message service of the uplink and downlink can be initiated normally.
  • the MSC/VLR serving the UE uses the international mobile subscriber identity of the UE (International The paging initiated by Mobile Subscriber Identity (IMSI) can be performed normally.
  • IMSI International The paging initiated by Mobile Subscriber Identity
  • the MSC/VLR serving the UE may use the IMSI-initiated paging of the UE, because the 2G/3G base station cannot receive the UE after the UE falls back to the 2G/3G network CS domain.
  • the paging response sent by the UE is sent to the MSC/VLR in the MSC Pool to initiate the paging, which causes the downlink CS service to fail.
  • the prior art modifies the paging policy on the MME, that is, whether the MSC/VLR uses the IMSI or the TMSI to perform paging on the SGs interface, and in any scenario, the MME uniformly uses the S-TMSI to page the UE, thus making the UE
  • the TMSI is used for paging response after falling back to the 2G/3G CS domain.
  • the MME uniformly uses the S-TMSI to page the UE, according to the current UE response policy, if the UE does not save the TMSI, the UE will not respond.
  • the S-TMSI paging initiated by the MME also causes the CS to be called to fail. Summary of the invention
  • the embodiment of the present invention provides a paging processing method and device for downlink circuit switched fallback CSFB, which is used to solve the problem that when the MME uses the S-TMSI paging UE in the MME, the UE does not respond because the TMSI is not saved in the UE.
  • a paging processing method for downlink circuit switched fallback CSFB includes: receiving, by a user equipment UE, a request message sent by a mobility management entity MME, where the request message is used to request the UE to initiate a circuit switched fallback CSFB process. And responding to the temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network; If the UE does not save the TMSI, the UE sends, to the MME, indication information indicating that the TMSI is not saved in the UE, so that the MME returns to indicate that the UE responds by using the international mobile subscriber identity IMSI. IMSI indication;
  • the request message is: a paging message or a CS service notification message.
  • the paging message includes an S-TMSI of the UE; or, the CS service notification message includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the request message is the CS service notification message
  • the UE is in an idle state, and the method further includes:
  • the UE After receiving the packet switched PS domain paging message sent by the S-TMSI of the UE, the UE enters a connected state from an idle state, where the CN field in the PS domain paging message is PS.
  • the indication information indicating that the TMSI is not saved in the UE includes:
  • the UE sends an extended service request message to the MME, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the request message further includes a mobile service switching center/visiting location register MSC/VLR
  • MSC/VLR mobile service switching center/visiting location register
  • the UE Transmitting, by the UE, the IMSI and the global CN ID of the UE to the target 2G/3G base station in the CSFB process, so that the target 2G/3G base station determines, according to the global CN ID, the UE The MSC/VLR.
  • a paging processing method for downlink circuit switched back-off CSFB includes: the mobility management entity MME sends a request message to the user equipment UE, where the request message is used to request the UE to initiate a circuit-switched fallback CSFB process and Responding to the temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network;
  • the MME After receiving the indication information sent by the UE to indicate that the TMSI is not saved in the UE, the MME sends an IMSI indication to the UE to instruct the UE to respond by using the international mobile subscriber identity IMSI.
  • the request message is: a paging message or a CS service notification message.
  • the paging message further includes an S-TMSI of the UE; or the CS service notification message further includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the method further includes:
  • the MME sends a packet switched PS domain paging message to the UE by using the S-TMSI of the UE, so that the UE enters a connected state, where the core network CN domain in the PS domain paging message is PS. .
  • the MME receives, by the UE, the indication that the TSI is not saved in the UE. Instructions, including:
  • the MME receives an extended service request message sent by the UE, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the method further includes:
  • the target 2G/3G base station determines the MSC/VLR for the UE according to the global CN ID.
  • the MME sends the IMSI and the global CN ID to the target 2G/3G base station by using the eNodeB, including :
  • the notification message is: a paging message or a downlink transmission message.
  • a third aspect is a user equipment UE, where the UE includes:
  • a first unit configured to receive a request message sent by the mobility management entity MME, where the request message is used to request the UE to which the first unit belongs to initiate a circuit switched fallback CSFB process and use temporary mobility after falling back to the circuit switched CS domain network.
  • User ID TMSI responds;
  • the UE does not save the TMSI, sending, to the MME, indication information indicating that the TMSI is not saved in the UE, so that the MME returns to indicate that the UE uses the international mobile subscriber identity (IMSI)
  • IMSI international mobile subscriber identity
  • the request message is: a paging message or a CS service notification message.
  • the paging message includes an S-TMSI of the UE; or, the CS service notification message includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the request message is the CS service notification message
  • the UE is in an idle state, and the first unit is further configured to:
  • the UE After receiving the packet-switched PS domain paging message sent by the S-TMSI of the UE, the UE is caused to enter the connected state from the idle state, where the CN field in the PS domain paging message is PS.
  • the first possible implementation manner of the third aspect, the second possible implementation manner of the third aspect, or the third possible implementation manner of the third aspect, in a fourth possible implementation manner is specifically configured to:
  • the indication information is a CSFB response value.
  • the first possible implementation of the third aspect, the second possible implementation of the third aspect, the third possible implementation of the third aspect, and the fourth possible aspect of the third aspect if the request message further includes a global core network identifier CN of the mobile services switching center/visiting location register MSC/VLR ID, the MSC/VLR is located in the MSC resource pool, and the third unit is further configured to:
  • a fourth aspect a user equipment UE, where the UE includes:
  • the transceiver is configured to receive a request message sent by the mobility management entity MME, where the request message is used to request the UE to which the transceiver belongs to initiate a circuit switched fallback CSFB process and use the temporary mobile subscriber identity after falling back to the circuit switched CS domain network.
  • the TMSI responds; if the UE does not save the TMSI, sending, to the MME, indication information indicating that the TMSI is not saved in the UE, so that the MME returns to indicate that the UE uses the International Mobile Subscriber Identity (IMSI)
  • IMSI International Mobile Subscriber Identity
  • a processor configured to, according to the IMSI indication returned by the MME, in the CSFB process, to enable the transceiver to send a paging response including the IMSI to the target second generation/third generation 2G/3G base station.
  • the request message is: a paging message or a CS service notification message.
  • the paging message includes an S-TMSI of the UE; or, the CS service notification message includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the request message is the CS service notification message
  • the UE is in an idle state, and the transceiver is also used to:
  • the UE After receiving the packet-switched PS domain paging message sent by the S-TMSI of the UE, the UE is caused to enter the connected state from the idle state, where the CN field in the PS domain paging message is PS.
  • the first possible implementation manner of the fourth aspect, the second possible implementation manner of the fourth aspect, or the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner is specifically used to:
  • the indication information is a CSFB response value.
  • the request message further includes a global core network identifier CN of the mobile services switching center/visiting location register MSC/VLR ID
  • the MSC/VLR is located in the MSC resource pool
  • the transceiver is further configured to:
  • a fifth aspect a mobility management entity MME, where the MME includes:
  • a first module configured to send a request message to the user equipment UE, where the request message is used to request the UE to initiate a circuit switched fallback CSFB process and respond to the temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network;
  • a second module after receiving the indication information that is sent by the UE to indicate that the TMSI is not saved in the UE, sending, to the UE, an IMSI for instructing the UE to respond by using an International Mobile Subscriber Identity (IMSI) Instructions.
  • IMSI International Mobile Subscriber Identity
  • the request message is: a paging message or a CS service notification message.
  • the paging message further includes an S-TMSI of the UE; or the CS service notification message further includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the request message is the CS service notification And the UE is in an idle state, and the first module is further configured to:
  • the second module receives the indication information that is sent by the UE to indicate that the TMSI is not saved in the UE, and includes:
  • the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the MME further includes:
  • a third module configured to send, by using the UE or the evolved Node B eNodeB, the global core network of the IMSI and the mobile services switching center/visiting location register MSC/VLR to the target second generation/third generation 2G/3G base station After identifying the CN ID, so that the UE falls back to the target 2G/3G base station, the target 2G/3G base station determines the MSC/VLR for the UE according to the global CN ID.
  • the third module sends the IMSI and the global CN ID to the target 2G/3G base station by using the eNodeB , including:
  • the message is: a paging message or a downlink transmission message.
  • a mobility management entity MME where the MME includes: a transmitter, configured to send a request message to the user equipment UE, where the request message is used to request the UE to initiate a circuit switched fallback CSFB process and respond with a temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network;
  • a receiver configured to: after receiving the indication information sent by the UE, indicating that the TMSI is not saved in the UE, sending, by the transmitter, the UE, to indicate, by the UE, to respond by using an International Mobile Subscriber Identity (IMSI) IMSI indication.
  • IMSI International Mobile Subscriber Identity
  • the request message is: a paging message or a CS service notification message.
  • the paging message further includes an S-TMSI of the UE; or the CS service notification message further includes a paging Identifying a cell, the value of the paging identity cell is used to indicate that the UE responds using the TMSI.
  • the request message is the CS service notification message
  • the UE is in an idle state, and the transmitter is also used to:
  • the first possible implementation manner of the sixth aspect, the second possible implementation manner of the sixth aspect, or the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner includes:
  • the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the transmitter is further configured to:
  • the target 2G/3G base station determines the MSC/VLR for the UE according to the global CN ID.
  • the sending, by the eNodeB, the IMSI and the global CN ID to the target 2G/3G base station by using the eNodeB including:
  • the message is: a paging message or a downlink transmission message.
  • the MME when the UE does not save the TMSI, the MME sends indication information indicating that the TMSI is not saved in the UE, so that the MME returns an IMSI indication for instructing the UE to use the IMSI to respond. Therefore, the UE may respond in the CSFB procedure using the IMSI of the UE according to the IMSI indication returned by the MME. In this way, although the TMSI is not saved in the UE, in the CSFB process, the IMSI of the UE can be used to respond, thereby avoiding the downlink CS service failure.
  • FIG. 1 is a flowchart of a paging processing method for downlink circuit switched fallback CSFB on the MME side according to the present invention
  • FIG. 2 is a flowchart of a paging processing method for a downlink circuit switched back CSFB of a UE side according to the present invention
  • Embodiment 1 of the present invention is a flowchart of Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of Embodiment 3 of the present invention
  • FIG. 6 is a schematic diagram of a first user equipment UE according to the present invention
  • FIG. 7 is a schematic diagram of a first user equipment UE according to the present invention.
  • FIG. 8 is a schematic diagram of a first mobility management entity MME according to the present invention.
  • FIG. 9 is a schematic diagram of a first mobility management entity MME according to the present invention. detailed description
  • the user equipment UE may be any one of the following, and the UE may be static or mobile.
  • the UE may include, but is not limited to: a station, a mobile station, a subscriber unit, a personal computer, a laptop computer, a tablet computer, and a tablet. Computer ), Netbook, UE (Cellular Phone), Cellular Phone, Handheld, Cordless Phone, Personal Digital Assistant (PDA), Data Card (Data Card) ), USB plug-in devices, mobile WiFi hotspot devices (MiFi Devices), smart watches, smart glasses, wireless modems (Modem), wireless routers, Wireless Local Loop (WLL) stations, etc.
  • the above UEs may be distributed throughout the wireless network.
  • the mobile switching center MSC and the visitor location register VLR are usually set to the same network element, called MSC/VLR, or simply VLR.
  • the evolved Node B eNodeB is a base station that provides an E-UTRAN access service for the UE.
  • the second/third generation 2G/3G base station can be a Base Station Subsystem (BSS) in a 2G network, or a Radio Network Subsystem (RNS) in a 3G network.
  • BSS Base Station Subsystem
  • RNS Radio Network Subsystem
  • the MSC/VLR may initiate a temporary The allocation process of the Temporary Mobile Subscriber Identity (TMSI) allocates TMSI to the UE.
  • TMSI Temporary Mobile Subscriber Identity
  • MSC Pool resource pool
  • multiple MSC/VLRs may be served in the same location area (Location Area).
  • the MSC/VLR usually allocates a TMSI containing the Network Resource Identifier (NRI) of the registered MSC/VLR.
  • the UE saves the TMSI allocated by the MSC/VLR in the registration process.
  • NRI Network Resource Identifier
  • the MSC/VLR After the joint registration succeeds, in the downlink paging triggered by the subsequent downlink CS service, the MSC/VLR performs the following paging policy: If the MSC/VLR allocates TMSI to the UE, the MSC/VLR initiates the SGs interface to the MME by using the TMSI. Paging; If the MSC/VLR does not allocate TMSI to the UE, the MSC/VLR initiates paging to the SGs interface of the MME by using an International Mobile Subscriber Identity (IMSI).
  • IMSI International Mobile Subscriber Identity
  • the MME After receiving the paging of the SGs interface, the MME performs the following paging policy: If the SGs interface uses TMSI paging, the MME uses the S-TMSI to page the UE; if the SGs interface uses the IMSI paging, the MME uses the IMSI to page the UE. . After receiving the paging request of the MME, after performing the CSFB procedure to fall back to the 2G/3G CS domain, the UE performs the following response policy: if the S-TMSI paging is received, the response is performed using the TMSI; if the IMSI is received, Call, then respond with IMSI.
  • multiple MSCs/VLRs can serve the UE in the same location area.
  • the base station (BSS/RNS) of the 2G/3G network cannot be guaranteed. Routing the paging response to the MSC/VLR that initiated the paging may cause the called CS service to fail.
  • the prior art modifies the paging policy on the MME, that is, whether the MSC/VLR uses the IMSI or the TMSI to perform paging on the SGs interface, and in any scenario, the MME uniformly uses the S-TMSI to page the UE, thus making the UE The TMSI is used for paging response after falling back to the 2G/3G CS domain.
  • the MSC/VLR still uses the IMSI to perform SGs interface paging in the following two scenarios: (1) According to the SGs interface paging policy set on the MSC/VLR, the IMSI is used to perform SGs interface paging.
  • the paging policy is: The first paging uses TMSI, if the paging fails, the second paging Continue to use TMSI, if it still fails, the third page will switch to IMSI. (2) If the TMSI allocation procedure initiated by the MSC/VLR fails, the MSC/VLR considers that the newly allocated TMSI is unreliable on the UE side. At this time, the MSC/VLR still uses the IMSI to perform SGs interface paging.
  • the MME uniformly uses the S-TMSI to page the UE, according to the current UE's response policy, if the UE does not save the TMSI, the UE will not respond to the S-TMSI page initiated by the MME, and the CS call will also fail.
  • the first application scenario is that in the non-MSC pool scenario, the MME indicates that the UE responds with the TMSI after falling back to the CS domain network, and the UE does not store the valid TMSI, so that the UE does not respond to the S-TMSI paging initiated by the MME. , causing the downlink CS service to fail;
  • the second application scenario is that in the MSC pool scenario, the MME indicates that the UE responds by using the TMSI after falling back to the CS domain network, and the UE does not store the legal TMSI, so that the UE does not respond to the S-TMSI paging initiated by the MME. , causing the downlink CS service to fail.
  • the second application scenario also has the following problems: Because there can be multiple in the same location area
  • the MSC/VLR provides services for the UE.
  • the base station (BSS/RNS) of the 2G/3G network cannot ensure that the paging response is routed to the MSC/VLR that initiates the paging, which may cause the called party to be called.
  • the CS business failed.
  • a paging processing method for downlink CS-switched CSFB of the UE side is provided by the embodiment of the present invention. As shown in FIG. 1, the method includes:
  • the UE receives a request message sent by the MME, where the request message is used to request the UE to initiate a CSFB process, and responds by using the TMSI after falling back to the CS domain network.
  • the UE If the UE does not save the TMSI, the UE sends, to the MME, indication information indicating that the TMSI is not saved in the UE, so that the MME returns an IMSI indication for indicating that the UE IMSI responds.
  • the UE sends a paging response including its own IMSI to the target 2G/3G base station in the CSFB process according to the IMSI indication returned by the MME.
  • the paging response is a response message to the MME requesting the UE to initiate a CSFB procedure.
  • the MME when the UE does not save the TMSI, the MME sends indication information indicating that the TMSI is not saved in the UE, so that the MME returns to indicate that the UE uses the IMSI.
  • the IMSI indication of the response so that the UE can respond with the IMSI of the UE in the CSFB procedure according to the IMSI indication returned by the MME.
  • the UE when receiving the request message sent by the MME, the UE further includes the following two preferred implementation manners according to the current state of the UE:
  • the request message is a paging message for paging the UE, and the paging message includes the S-TMSI of the UE;
  • the UE receives a paging message, which is sent by the eNodeB serving the UE, for paging the UE, and the paging message carries the S-TMSL of the UE.
  • the MME sends a paging message for paging the UE to the eNodeB serving the UE, where the paging message includes the S-TMSI of the UE, so that the eNodeB passes the air interface paging for paging the UE.
  • the message sends the S-TMSI of the UE to the UE, so that the UE responds with the TMSI of the UE after falling back to the CS domain network.
  • the core network (CN) field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI.
  • Paging Identity paging identity
  • the UE receives the CS service notification message sent by the MME through the existing underlying signaling connection with the UE.
  • the request message further includes a global CN ID of the MSC/VLR
  • the MSC/VLR is an MSC/VLR serving the UE
  • the MSC/VLR is located in the MSC resource pool.
  • SI 1 when the UE receives the request message sent by the MME, according to the current state of the UE, the UE further includes the following three preferred implementation manners:
  • the request message received by the UE is a paging message, and the paging message is sent.
  • the global CN ID of the S-TMSI and MSC/VLR of the UE is included, the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the paging message includes a paging message sent by the MME to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the UE.
  • a paging message such as an air interface paging message
  • the MME sends a paging message to the eNodeB, and includes the global CN ID of the S-TMSI and the MSC/VLR of the UE in the paging message, so that the eNodeB sends the S-TMSI of the UE and the MSC/VLR.
  • the global CN ID is sent to the UE.
  • the eNodeB After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the UE, and carries the S- of the UE in the air interface paging message. TMSI and the global CN ID of the MSC/VLR.
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the UE further includes: before receiving the request message sent by the MME:
  • the UE After receiving the Packet Switch (PS) domain paging message sent by the S-TMSI of the UE, the UE enters a connected state from an idle state, where the CN field in the PS domain paging message is PS.
  • PS Packet Switch
  • the MME sends a paging message for paging the UE to the eNodeB by using the S-TMSI, where the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the UE by using the S-TMSI, and the CN field in the air interface paging message is set to "PS”.
  • the UE after receiving the air interface paging message, the UE sends a service request (Service Request) message to the MME through the eNodeB to respond, and the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the request message sent by the MME is received, where the request message is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, where The value of the paging identification cell is used to indicate a paging response using the TMSI, which is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the receiving MME sends a CS service notification message to the UE by using the existing underlying signaling connection, where the message includes the paging identifier cell and the global CN ID of the MSC/VLR, the paging
  • the value of the identification cell is used to indicate that the paging response is made using TMSI.
  • the MME first sends the UE in the idle state to the connected state, and then sends the paging identifier cell and the global CN ID of the MSC/VLR to the UE, thereby avoiding increasing the length of the air interface paging message and increasing unnecessary. Paging delay and paging resource overhead.
  • the request message received by the UE is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, and the value of the paging identifier cell is used.
  • the paging response is indicated using TMSI, which is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the UE receives the CS service notification message sent by the MME to the UE by using the existing underlying signaling connection, where the message includes the paging identifier cell and the global CN ID of the MSC/VLR.
  • the global CN ID of the MSC/VLR is defined by the operator and is set by the operation and maintenance mode.
  • the global CN ID of the MSC/VLR includes the public land mobile network identifier (PLMN) of the operator. ID) With the CN ID of the MSC/VLR, the global CN ID of the MSC/VLR can uniquely identify an MSC/VLR in the operator PLMN.
  • PLMN public land mobile network identifier
  • the MSC/VLR carries its own global CN ID in the SGs paging message.
  • the method further includes:
  • the UE Transmitting, by the UE, the IMSI of the UE and the global CN ID of the MSC/VLR to the target 2G/3G base station in the CSFB process, so that the target 2G/3G base station is configured according to the global CN ID of the MSC/VLR.
  • the UE determines the MSC/VLR.
  • the method further includes: the UE buffering the global CN ID of the received MSC/VLR;
  • the method further includes: deleting, by the UE, the global CN ID of the buffered MSC/VLR.
  • the UE after successfully establishing a CS signaling connection, the UE performs CS in the target side 2G/3G CS domain. Service; After the CS service ends, the UE can delete the cached MSC/VLR global CN ID.
  • the UE initiates the CSFB process according to any one of the foregoing first application scenario and the second application scenario, where the UE sends an extended service request (Extended Service Request) message to the MME, and triggers the MME to initiate a CSFB fallback process to the eNodeB.
  • the entire CSFB fallback process is prior art, as described in the 3GPP TS 23.272 protocol.
  • the UE sends, to the MME, indication information that is used to indicate that the UE does not save the TMSI, where:
  • the UE sends an extended service request message to the MME, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • a paging processing method for downlink circuit switched back CSFB on the MME side is provided by the embodiment of the present invention. As shown in FIG. 2, the method includes:
  • the MME sends a request message to the UE, where the request message is used to request the UE to initiate a CSFB process and respond to the TMSI after falling back to the CS domain network.
  • the MME After receiving the indication information sent by the UE to indicate that the TMSI is not saved in the UE, the MME sends an IMSI indication to the UE to indicate that the UE responds by using the IMSI.
  • the MME after receiving the indication information that is sent by the UE to indicate that the TMSI is not saved in the UE, the MME sends an IMSI indication to the UE to indicate that the UE uses the IMSI to respond, so that the UE is falling back.
  • the IMSI of the UE can also be used to respond, thereby avoiding the failure of the downlink CS service.
  • the request message sent by the MME to the UE in the S21 is different according to the current state of the UE, and specifically includes the following two preferred implementation manners:
  • the request message is a paging message for paging the UE, and the paging message includes the S-TMSI of the UE;
  • the MME sends a paging message for paging the UE to the eNodeB serving the UE, where the paging message includes the S-TMSI of the UE, so that the eNodeB passes the paging for the UE.
  • the air interface paging message sends the S-TMSI of the UE to the UE, so that the UE responds with the TMSI of the UE after falling back to the CS domain network.
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI.
  • Paging Identity paging identity
  • the MME sends a CS service notification message to the UE by using an underlying signaling connection existing between the UE.
  • the request message further includes a global CN ID of the MSC/VLR, the MSC/VLR is an MSC/VLR serving the UE, and the MSC/VLR is located in the MSC resource pool.
  • the request message sent by the MME to the UE in S21 is also different, and specifically includes the following two preferred implementation manners:
  • the request message sent by the MME to the UE is a paging message, where the paging message includes the global CN ID of the S-TMSI and the MSC/VLR of the UE, and the MSC/VLR is provided for the UE.
  • the serving MSC/VLR and the MSC/VLR are located in the MSC resource pool.
  • the paging message includes a paging message sent by the MME to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the UE.
  • a paging message such as an air interface paging message
  • the MME sends a paging message for paging the UE to the eNodeB, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR that initiates paging, so that the eNodeB passes the paging UE.
  • the air interface paging message transmits the S-TMSI of the UE and the global CN ID to the UE.
  • the eNodeB After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the UE, and carries the S- of the UE in the air interface paging message. TMSI and the global CN ID of the MSC/VLR.
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the method further includes: The PS domain paging message is sent to the UE by using the S-TMSI of the UE, so that the UE enters a connected state, where the CN domain in the PS domain paging message is a PS.
  • the MME sends a paging message for paging the UE to the eNodeB by using the S-TMSI, where the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the UE by using the S-TMSI, and the CN field in the air interface paging message is set to "PS”.
  • the UE after receiving the air interface paging message, the UE sends a service request (Service Request) message to the MME through the eNodeB to respond, and the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the request message sent by the MME to the UE is a CS service notification message, where the CS service notification message includes a paging identity (Paging identity) cell and a global CN ID of the MSC/VLR.
  • the value of the paging identification cell is used to indicate a paging response using the TMSI
  • the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the MME first sends the UE in the idle state to the connected state, and then sends the paging identifier cell and the global CN ID of the MSC/VLR to the UE, thereby avoiding increasing the length of the air interface paging message and increasing unnecessary. Paging delay and paging resource overhead.
  • the request message sent by the MME to the UE is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, and the value of the paging identifier cell
  • the MSC/VLR is an MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the CS service notification message is sent to the UE by using an existing underlying signaling connection, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR.
  • the method further includes:
  • the MME sends the IMSI of the UE and the global CN ID to the target 2G/3G base station by using the UE or the eNodeB, so that after the UE falls back to the target 2G/3G base station, the target 2G/3G base station according to the The global CN ID determines the MSC/VLR for the UE.
  • the MME sends the IMSI of the UE and the global CN ID of the MSC/VLR to the target 2G/3G base station by using the eNodeB, including: The MME sends a notification message including the IMSI of the UE and the global CN ID of the MSC/VLR to the eNodeB, so that the eNodeB sends the IMSI of the UE and the global CN ID of the MSC/VLR to The target 2G/3G base station, where the notification message is: a paging message or a downlink transmission message.
  • the MME receives the indication information that is sent by the UE to indicate that the TMSI is not saved in the UE, and includes:
  • the MME receives the extended service request message sent by the UE, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the MME sends an IMSI indication to the UE to indicate that the UE responds by using the IMSI, including:
  • the MME sends a CS service notification message to the UE, where the CS service notification message includes an IMSI indication for indicating that the UE responds with the IMSI.
  • the MME when the MME sends an IMSI indication to the UE to indicate that the UE uses the IMSI to respond, the MME may send the existing signaling (such as a CS service notification message, etc.), or may be new between the MME and the UE. Defined signaling.
  • the interaction between the MSC/VLR, the MME, the eNodeB, the UE, and the 2G/3G base station (BSS/RNS) in the method provided by the present invention will be described in detail below with reference to three specific embodiments.
  • Embodiment 1 As shown in FIG. 3, the process of this embodiment is as follows:
  • the UE initiates a joint attach procedure or a joint location update procedure, and successfully registers in the EPC network PS domain MME and the 2G/3G network CS domain MSC/VLR.
  • the MSC/VLR After receiving the downlink CS service request, the MSC/VLR initiates a paging request to the MME associated with the SGs by using the IMSI or TMSI of the UE, where the paging request carries the global CN ID of the MSC/VLR.
  • the MME After receiving the SGs paging request sent by the MSC/VLR, the MME performs different operations according to the current state of the UE: if the UE is currently in the idle state, step 3b or 3c is performed; if the UE is currently in the connected state, the MME performs Step 3d. 3b.
  • the MME sends a paging message to the eNodeB, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR received from the MSC/VLR, and the CN field in the paging message is set to "CS" .
  • the eNodeB forwards the S-TMSI of the UE and the global CN ID of the MSC/VLR to the UE in the air interface paging message, and the CN field in the air interface paging message is set to "CS".
  • the MME sends a paging message to the eNodeB using the S-TMSI, and the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message to the UE by using the S-TMSI, and the CN field in the air interface paging message is set to "PS".
  • the UE sends a service request (Service Request) message to the MME to respond.
  • the MME sends a CS service notification message to the UE by using the existing underlying signaling connection, where the message includes the paging identifier cell and the global CN ID of the MSC/VLR received from the MSC/VLR.
  • the value of the call identity cell is used to indicate that the UE uses the TMSI to perform a paging response.
  • the MME uses the S-TMSI and the CN domain to initiate the paging, which is mainly to change the UE from the idle state to the connected state, so as to avoid carrying the MSC/VLR directly in the paging message.
  • Global CN ID increases unnecessary paging delay and paging resource overhead because the global CN ID of the MSC/VLR is 5 bytes in length.
  • the MME sends a CS service notification message to the UE through an existing underlying signaling connection with the UE, where the CS service notification message includes the paging identifier cell and the global CN ID of the MSC/VLR received from the MSC/VLR.
  • the value of the paging identifier cell is used to indicate that the UE uses the TMSI to perform a paging response.
  • the UE After receiving the S-TMSI paging message or the CS service notification message indicated by the TMSI, the UE buffers the global CN ID of the received MSC/VLR. If the UE does not have a valid TMSI, step 4a is performed;
  • the UE explicitly informs the MME that it does not have a valid TMSI.
  • the UE may send an extended service request ( Extended Service Request) message to the MME, where the message carries indication information indicating that the valid TMSI is not saved in the UE.
  • the indication information can be a CSFB response value.
  • the MME learns that the valid TMSI is not saved in the UE, the MME sends a CS service notification message to the UE by using an underlying signaling connection with the UE, where the CS service notification message message includes the paging identifier cell.
  • the value of the paging identifier cell is used to indicate that the UE uses the IMSI to perform a paging response.
  • the UE After receiving the CS service notification message, the UE initiates a CSFB process.
  • the UE sends an Extended Service Request message to the MME, which triggers the MME to initiate a CSFB fallback process to the eNodeB.
  • the entire CSFB fallback process is an existing technology and will not be described here.
  • the UE After successfully falling back to the 2G/3G CS domain, the UE receives the CS service notification message including the IMSI indication in step 5, and the UE uses the IMSI to perform the paging response, and the UE carries the buffered MSC in the paging response.
  • the BSS/RNS After receiving the IMSI paging response, the BSS/RNS selects the serving MSC/VLR according to the global CN ID of the MSC/VLR carried in the paging response. Since the global CN ID of the MSC/VLR can uniquely identify an MSC/VLR in the operator PLMN, including in the MSC pool scenario, it can ensure that the BSS/RNS routes the paging response to the MSC/VLR that initiates the SGs paging. To avoid the failure of the downlink CS service.
  • the UE After the CS signaling connection is successfully established, the UE performs CS services in the target 2G/3G CS domain. Optionally, after the CS service ends, the UE may delete the global CN ID of the cached MSC/VLR.
  • Embodiment 2 As shown in FIG. 4, the process of this embodiment is as follows:
  • the UE initiates a joint attach procedure or a joint location update procedure, and successfully registers in the EPC network PS domain MME and the 2G/3G network CS domain MSC/VLR.
  • the MSC/VLR After receiving the downlink CS service request, the MSC/VLR initiates a paging request to the MME associated with the SGs by using the IMSI or the TMSI of the UE, where the paging request carries the global CN ID of the MSC/VLR. At the same time, the MSC/VLR sends the IMSI of the UE and the global CN ID of the MSC/VLR to all BSS/RNS within the MSC/VLR service range.
  • the MSC/VLR sends the IMSI of the UE and the global CN ID of the MSC/VLR to the BSS/RNS through the existing downlink A/Iu interface message or the newly defined A/Iu interface message, and the specific sending manner is not performed by the present invention. limited.
  • the BSS/RNS caches the IMSI of the UE and the global CN ID of the MSC/VLR.
  • the BSS/RNS may establish a mapping relationship between the IMSI of the UE and the global CN ID of the MSC/VLR.
  • the BSS/RNS may start a timer after receiving the global IM ID of the UE and the MSC/VLR of the UE, and may clear the IMSI of the saved UE and the global CN ID of the MSC/VLR when the timer expires.
  • the setting of the timer duration is set by the operator or the default value is used.
  • the MME After receiving the SGs paging request message sent by the MSC/VLR, the MME performs different operations according to the current state of the UE: If the UE is currently in the idle state, step 3b is performed; if the UE is currently in the connected state, the step is performed. 3c.
  • the MME sends a paging message to the eNodeB, where the paging message includes the S-TMSI of the UE, and the CN field in the paging message is set to "CS".
  • the eNodeB sends an air interface paging message to the UE, where the air interface paging message includes the S-TMSI of the UE, and the CN field is set to "CS";
  • the MME sends a CS service notification message to the UE by using an underlying signaling connection with the UE, where the CS service notification message includes a paging identifier cell, where the value of the paging identifier cell is used to indicate the UE.
  • the UE After receiving the S-TMSI paging message or the CS service notification message including the TMSI indication, if the UE does not store the legal TMSI, the UE explicitly informs the MME that it has no legitimate TMSI.
  • the UE may send an extended service request (Extended Service Request) message to the MME, where the message carries indication information indicating that the legal TMSI is not saved in the UE.
  • the indication information can be a CSFB response value.
  • the MME After the MME learns that the valid TMSI is not saved in the UE, the MME sends a CS service notification message to the UE by using an underlying signaling connection with the UE, where the CS service notification message message includes the paging identifier cell.
  • the value of the paging identifier cell is used to indicate that the UE uses the IMSI to perform a paging response.
  • the UE After receiving the CS service notification message, the UE initiates a CSFB process.
  • the UE sends an extended service request (Extended Service Request) to the MME.
  • the trigger MME initiates the CSFB fallback process to the eNodeB.
  • the entire CSFB fallback process is prior art and will not be described here.
  • the UE After the UE successfully falls back to the 2G/3G CS domain, the UE will use the IMSI to perform the paging response because the CS service notification message including the IMSI indication is received in step 5.
  • the BSS/RNS After receiving the IMSI paging response, the BSS/RNS obtains the global CN ID of the MSC/VLR according to the mapping relationship between the saved IMSI and the global CN ID of the MSC/VLR according to the IMSI, and according to the global CN ID of the MSC/VLR. To choose to serve MSC/VLR. Since the global CN ID of the MSC/VLR can uniquely identify an MSC/VLR in the operator PLMN, including in the MSC pool scenario, it can ensure that the BSS/RNS routes the paging response to the MSC/VLR that initiates the SGs paging. To avoid the failure of the downlink CS service.
  • the UE After the CS signaling connection is successfully established, the UE performs CS services in the target 2G/3G CS domain.
  • the above two embodiments solve the problem that the CS service fails due to the UE not responding to the MME paging in the MSC pool scenario, and the UE does not have a valid TMSI, and also solves the problem that multiple MSCs may exist in the same location area.
  • the /VLR provides services for the UE.
  • the base station (BSS/RNS) of the 2G/3G network cannot ensure that the paging response is routed to the MSC/VLR that initiates the paging, which easily leads to the called CS.
  • the problem of business failure The problem of business failure.
  • Embodiment 3 As shown in FIG. 5, the process of this embodiment is as follows:
  • the UE initiates a joint attach procedure or a joint location update procedure, and successfully registers in the EPC network PS domain MME and the 2G/3G network CS domain MSC/VLR.
  • the MSC/VLR After receiving the downlink CS service request, the MSC/VLR initiates a paging request to the MME associated with the SGs by using the IMSI of the UE.
  • the MME After receiving the SGs paging request message sent by the MSC/VLR, the MME performs different operations according to the current state of the UE: If the UE is currently in the idle state, step 3b is performed; if the UE is currently in the connected state, the step is performed. 3c.
  • the MME sends a paging message to the eNodeB using the S-TMSI, and the CN field in the message is set to "CS".
  • the eNodeB sends an air interface paging message to the UE by using the S-TMSI, where the CN field is set to "CS".
  • the MME sends a CS service notification message to the UE by using an underlying signaling connection with the UE, where the message includes a paging identifier cell, and the value of the paging identifier cell is used to indicate that the UE uses the TMSI. Make a page response.
  • the UE After receiving the S-TMSI paging message or the CS service notification message including the TMSI indication, if the UE does not save the legal TMSI, the UE explicitly informs the MME that it has no legal TMSI.
  • the UE may send an extended service request (Extended Service Request) message to the MME, where the message carries indication information indicating that the UE does not save the legal TMSI.
  • the indication information can be a CSFB response value.
  • the MME After the MME knows that the UE does not have a valid TMSI, the MME sends a CS service notification message to the UE by using an underlying signaling connection with the UE, where the message includes a paging identifier cell, and the paging identifier cell The value is used to instruct the UE to use the IMSI for paging response.
  • the UE After receiving the paging message or CS service notification message with the CN field being "CS", the UE initiates the CSFB process.
  • the UE sends an Extended Service Request message to the MME, which triggers the MME to initiate a CSFB fallback process to the eNodeB.
  • the entire CSFB fallback process is state of the art.
  • the UE After the UE successfully falls back to the 2G/3G CS domain, the UE will use the IMSI to perform the paging response because the CS service notification message including the IMSI indication is received in step 5.
  • the BSS/RNS routes the paging response to the selected MSC/VLR.
  • the UE After the CS signaling connection is successfully established, the UE performs CS service in the target 2G/3G CS domain. This embodiment solves the problem that the called CS service fails because the UE does not respond to the MME paging when the UE does not have a valid TMSI in the non-MSC pool scenario.
  • the UE includes:
  • the first unit 61 is configured to receive a request message sent by the MME, where the request message is used to request the UE to which the first unit 61 belongs to initiate a circuit switched fallback CSFB process and use the temporary mobile user after falling back to the circuit switched CS domain network. Identify the TMSI to respond;
  • the second unit 62 if the UE does not save the TMSI, send, to the MME, indication information indicating that the TMSI is not saved in the UE, so that the MME returns to indicate that the UE uses the international mobile subscriber identity IMSI.
  • the IMSI indication of the response is configured to receive a request message sent by the MME, where the request message is used to request the UE to which the first unit 61 belongs to initiate a circuit switched fallback CSFB process and use the temporary mobile user after falling back to the circuit switched CS domain network. Identify the TMSI to respond;
  • the second unit 62 if the UE does not save the TMSI, send, to the MME, indication
  • the third unit 63 is configured to send, according to the IMSI indication returned by the MME, a paging response including the IMSI to the target second generation/third generation 2G/3G base station in the CSFB process.
  • the first unit 61 when the first unit 61 receives the request message sent by the MME, it further includes the following two preferred implementation manners according to the current state of the UE to which the MME belongs:
  • the first unit 61 receives a paging message sent by the MME for paging the UE by using the eNodeB serving the UE, where the paging message carries the S-TMSL of the UE.
  • the MME sends a paging message for paging the UE to the eNodeB serving the UE, where the paging message includes the S-TMSI of the UE, so that the eNodeB passes the air interface paging message for paging the UE.
  • the S-TMSI of the UE is transmitted to the first unit 61, so that the third unit 63 responds with the TMSI of the UE in the CSFB procedure.
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the first unit 61 is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI to search. Call response.
  • paging identity Paging Identity
  • the first unit 61 receives the CS service notification message sent by the MME through the existing underlying signaling connection with the UE.
  • the request message further includes a global CN ID of the MSC/VLR, the MSC/VLR is an MSC/VLR serving the UE, and the MSC/VLR is located in the MSC resource pool.
  • the first unit 61 when receiving the request message sent by the MME, the first unit 61 further includes the following three preferred implementation manners according to different current states of the UE:
  • the request message received by the first unit 61 is a paging message, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR, where the MSC/VLR is The MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the paging message includes a paging message sent by the MME to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the first unit 61.
  • the MME sends a paging message to the eNodeB, and includes the global CN ID of the S-TMSI and the MSC/VLR of the UE in the paging message, so that the eNodeB globally sets the S-TMSI of the UE and the MSC/VLR.
  • the CN ID is sent to the UE.
  • the eNodeB After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the first unit 61, and carries the UE in the air interface paging message.
  • S-TMSI and the global CN ID of the MSC/VLR After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the first unit 61, and carries the UE in the air interface
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the first unit 61 is set to "CS".
  • the first unit 61 before receiving the request message sent by the MME, further includes:
  • the first unit 61 After receiving the PS domain paging message sent by the S-TMSI of the UE, the first unit 61 causes the UE to enter the connected state from the idle state, where the CN field in the PS domain paging message is PS.
  • the MME sends a paging message for paging the UE to the eNodeB by using the S-TMSI, where the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the first unit 61 by using the S-TMSI, and the CN field in the air interface paging message is set to "PS”.
  • the first unit 61 after receiving the air interface paging message, the first unit 61 sends a service request (Service Request) message to the MME through the eNodeB to respond, and the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the first unit 61 receives the request message sent by the MME, where the request message is a CS service notification message, where the CS service notification message includes the paging identifier cell and the global CN of the MSC/VLR.
  • ID the value of the paging identification cell is used to indicate that the paging response is performed using the TMSI
  • the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the request message received by the first unit 61 is a CS service notification.
  • the message, the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, where the value of the paging identifier cell is used to indicate that the paging response is performed by using the TMSI, and the MSC/VLR is serving the UE.
  • the MSC/VLR and the MSC/VLR are located in the MSC resource pool.
  • the first unit 61 receives the CS service notification message sent by the MME to the UE by using the existing underlying signaling connection, where the message includes the paging identifier cell and the global CN ID of the MSC/VLR.
  • the third unit 63 is further configured to:
  • the first unit 61 is further configured to: buffer the global CN ID of the received MSC/VLR;
  • the third unit 63 is further configured to: delete the global CN ID of the buffered MSC/VLR.
  • the second unit 62 sends the indication information indicating that the TMSI is not saved in the UE to the MME, including:
  • the MME sends an extended service request message, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • another user equipment UE provided by the embodiment of the present invention, as shown in FIG. 7, includes:
  • the transceiver 71 is configured to receive a request message sent by the MME, where the request message is used to request the UE to which the UE belongs to initiate the CSFB process, and use the TMSI to respond after falling back to the CS domain network; if the UE does not save the TMSI, the The MME sends indication information indicating that the TMSI is not saved in the UE, so that the MME returns an IMSI indication for indicating that the UE responds by using the IMSI;
  • the processor 72 is configured to, according to the IMSI indication returned by the MME, enable the transceiver 71 to send a paging response including the IMSI to the target 2G/3G base station in the CSFB procedure.
  • the transceiver 71 and the processor 72 are connected by a bus.
  • the transceiver 71 when receiving the request message sent by the MME, the transceiver 71 further includes the following two preferred implementation manners according to the current state of the UE to which the MME belongs:
  • the request message is a paging message for paging the UE, and the paging message includes the S-TMSI of the UE;
  • the transceiver 71 receives a paging message sent by the MME for paging the UE by using the eNodeB serving the UE, where the paging message carries the S-TMSL of the UE.
  • the core network (CN) field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the transceiver 71 is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI to search. Call response.
  • paging identity Paging Identity
  • the transceiver 71 receives the CS service notification message sent by the MME through the existing underlying signaling connection with the UE.
  • the request message further includes a global CN ID of the MSC/VLR
  • the MSC/VLR is an MSC/VLR serving the UE
  • the MSC/VLR is located in the MSC resource pool.
  • the transceiver 71 when receiving the request message sent by the MME, the transceiver 71 further includes the following three preferred implementation manners according to different current states of the UE:
  • the request message received by the transceiver 71 is a paging message, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR, and the MSC/VLR provides services for the UE.
  • the MSC/VLR and the MSC/VLR are located in the MSC resource pool.
  • the paging message includes a paging message sent by the MME to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the transceiver 71.
  • the MME sends a paging message to the eNodeB, and includes the S-TMSI of the UE and the global CN ID of the MSC/VLR in the paging message, so that the eNodeB sets the S-TMSI of the UE and the The global CN ID of the MSC/VLR is sent to the UE.
  • the eNodeB After receiving the paging message that is sent by the MME and carrying the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the transceiver 71, and carries the S of the UE in the air interface paging message.
  • TMSI and the global CN ID of the MSC/VLR After receiving the paging message that is sent by the MME and carrying the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message
  • the CN field in the paging message sent by the MME to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the transceiver 71 is set to "CS".
  • the transceiver 71 is further configured to: before receiving the request message sent by the MME:
  • the MME After receiving the PS domain paging message sent by the S-TMSI of the UE, the MME enters the connection state from the idle state, where the CN field in the PS domain paging message is PS.
  • the MME sends a paging message for paging the UE to the eNodeB by using the S-TMSI, where the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the transceiver 71 using the S-TMSI, and the CN field in the air interface paging message is set to "PS".
  • the transceiver 71 After receiving the air interface paging message, the transceiver 71 sends a service request (Service Request) message to the MME through the eNodeB to respond. At this time, the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the transceiver 71 receives the request message sent by the MME, where the request message is a CS service notification message, where the CS service notification message includes the paging identifier cell and the global CN ID of the MSC/VLR.
  • the value of the paging identification cell is used to indicate that the paging response is performed using the TMSI
  • the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the request message received by the transceiver 71 is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, where the paging identifier cell
  • the value is used to indicate a paging response using the TMSI, which is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the transceiver 71 receives the CS service notification message sent by the MME to the UE by using the existing underlying signaling connection, where the message includes the paging identifier cell and the global CN ID of the MSC/VLR.
  • the transceiver 71 is further configured to: Transmitting, in the CSFB procedure, the IMSI of the UE and the global CN ID of the MSC/VLR to the target 2G/3G base station, so that the target 2G/3G base station determines the MSC/VLR for the UE according to the global CN ID of the MSC/VLR. .
  • the processor 72 is further configured to: buffer the global CN ID of the received MSC/VLR;
  • the processor 72 is further configured to: delete the global CN ID of the buffered MSC/VLR.
  • the transceiver 71 sends, to the MME, indication information indicating that the TMSI is not saved in the UE, specifically: sending an extension to the MME, according to any of the foregoing first application scenario and the second application scenario. And a service request message, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • an embodiment of the present invention provides an MME.
  • the MME includes:
  • the first module 81 is configured to send a request message to the user equipment UE, where the request message is used to request the UE to initiate a circuit switched fallback CSFB process and respond with a temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network;
  • the second module 82 is configured to: after receiving the indication information that is sent by the UE to indicate that the TMSI is not saved in the UE, send, to the UE, the UE to use the international mobile subscriber identity IMSI to respond. IMSI instructions.
  • the request message sent by the first module 81 to the UE is different according to the current state of the UE, and specifically includes the following two preferred implementation manners:
  • the request message is a paging message for paging the UE, and the paging message includes the S-TMSI of the UE;
  • the first module 81 sends a paging message for paging the UE to the eNodeB serving the UE, where the paging message includes the S-TMSI of the UE, so that the eNodeB passes the paging
  • the air interface paging message of the UE sends the S-TMSI of the UE to the UE, so that the UE responds with the TMSI of the UE after falling back to the CS domain network.
  • the CN field in the paging message sent by the first module 81 to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI.
  • Paging Identity paging identity
  • the first module 81 sends a CS service notification message to the UE by using an underlying signaling connection existing between the UE.
  • the request message further includes a global CN ID of the MSC/VLR, the MSC/VLR is an MSC/VLR serving the UE, and the MSC/VLR is located in the MSC resource pool.
  • the request message sent by the first module 81 to the UE is different according to the current state of the UE, and specifically includes the following two preferred implementation manners:
  • the request message sent by the first module 81 to the UE is a paging message, where the paging message includes the global CN ID of the S-TMSI and the MSC/VLR of the UE, where the MSC/VLR is The UE provides the served MSC/VLR and the MSC/VLR is located in the MSC resource pool.
  • the paging message includes a paging message sent by the first module 81 to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the UE.
  • a paging message such as an air interface paging message
  • the first module 81 sends a paging message for paging the UE to the eNodeB, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR that initiates paging, so that the eNodeB is used for
  • the air interface paging message of the paging UE transmits the S-TMSI of the UE and the global CN ID to the UE.
  • the eNodeB After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE sent by the first module 81, the eNodeB sends an air interface paging message to the UE, and carries the UE in the air interface paging message.
  • the S-TMSI and the global CN ID of the MSC/VLR After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE sent by the first module
  • the CN field in the paging message sent by the first module 81 to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the method further includes: The first module 81 sends a PS domain paging message to the UE by using the S-TMSI of the UE, so that the UE enters a connected state, where the CN domain in the PS domain paging message is a PS.
  • the first module 81 sends a paging message for paging the UE to the eNodeB by using the S-TMSI, and the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the UE by using the S-TMSI, where the CN field is set to "PS”.
  • the UE after receiving the air interface paging message, the UE sends a service request (Service Request) message to the MME to respond by using the eNodeB. At this time, the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the request message sent by the first module 81 to the UE is a CS service notification message, where the CS service notification message includes a paging identity (Paging identity) cell and a global MSC/VLR.
  • the CS service notification message includes a paging identity (Paging identity) cell and a global MSC/VLR.
  • CN ID the value of the paging identification cell is used to indicate that the paging response is performed using the TMSI
  • the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the request message sent by the first module 81 to the UE is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, and the paging identifier message
  • the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, and the paging identifier message
  • the value of the element is used to indicate the paging response using the TMSI, which is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the first module 81 sends an CS service notification message to the UE by using an existing underlying signaling connection, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR.
  • the MME further includes:
  • a third module configured to send, by using a UE or an eNodeB, the IMSI of the UE and the global CN ID to a target 2G/3G base station, so that after the UE falls back to the target 2G/3G base station, the target 2G
  • the /3G base station determines the MSC/VLR for the UE according to the global CN ID.
  • the third module sends the IMSI of the UE and the global CN ID of the MSC/VLR to the target 2G/3G base station by using the eNodeB, including:
  • the eNodeB Transmitting a notification message including the IMSI of the UE and the global CN ID of the MSC/VLR to the eNodeB, so that the eNodeB sends the IMSI of the UE and the global CN ID of the MSC/VLR to the The target 2G/3G base station, where the notification message is: a paging message or The message is transmitted downstream.
  • the second module 82 receives the indication information that is sent by the UE to indicate that the UE does not save the TMSI, and includes: receiving, by the UE, And an extended service request message, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the second module 82 sends an IMSI indication to the UE to indicate that the UE responds by using the IMSI, including: sending the CS service to the UE.
  • the notification message includes an IMSI indication for indicating that the UE responds with the IMSI.
  • the second module 82 may send the existing signaling (such as a CS service notification message, etc.), or may use the MME and the UE. Newly defined signaling between.
  • the embodiment of the present invention further provides another MME.
  • the MME includes:
  • the transmitter 91 is configured to send a request message to the user equipment UE, where the request message is used to request the UE to initiate a circuit switched fallback CSFB process and respond with a temporary mobile subscriber identity TMSI after falling back to the circuit switched CS domain network;
  • the receiver 92 is configured to: after receiving the indication information sent by the UE to indicate that the TMSI is not saved in the UE, send the transmitter 91 to the UE to instruct the UE to use the International Mobile Subscriber Identity (IMSI) The IMSI indication of the response.
  • IMSI International Mobile Subscriber Identity
  • the transmitter 91 and the receiver 92 are connected by a bus.
  • the request message sent by the transmitter 91 to the UE is different according to the current state of the UE, and specifically includes the following two preferred implementation manners:
  • the request message is a paging message for paging the UE, and the paging message includes the S-TMSI of the UE;
  • the transmitter 91 sends a paging message for paging the UE to the eNodeB serving the UE, where the paging message includes the S-TMSI of the UE, so that the eNodeB passes the air interface for paging the UE.
  • the paging message sends the S-TMSI of the UE to the UE, so that the UE responds with the TMSI of the UE after falling back to the CS domain network.
  • the CN field in the paging message sent by the transmitter 91 to the eNodeB is set to "CS"; the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the request message is a CS service notification message, where the CS service notification message includes a paging identity (Paging Identity) cell, where the value of the paging identifier cell is used to indicate that the UE uses the TMSI.
  • Paging Identity paging identity
  • the transmitter 91 sends a CS service notification message to the UE through an existing underlying signaling connection with the UE.
  • the request message further includes a global CN ID of the MSC/VLR, the MSC/VLR is an MSC/VLR serving the UE, and the MSC/VLR is located in the MSC resource pool.
  • the request message sent by the transmitter 91 to the UE is also different, and specifically includes the following two preferred implementation manners:
  • the request message sent by the transmitter 91 to the UE is a paging message, where the paging message includes the global CN ID of the S-TMSI and the MSC/VLR of the UE, where the MSC/VLR is The UE provides the served MSC/VLR and the MSC/VLR is located in the MSC resource pool.
  • the paging message includes a paging message sent by the transmitter 91 to the eNodeB serving the UE, and a paging message (such as an air interface paging message) sent by the eNodeB to the UE.
  • a paging message such as an air interface paging message
  • the transmitter 91 sends a paging message for paging the UE to the eNodeB, where the paging message includes the S-TMSI of the UE and the global CN ID of the MSC/VLR that initiates the paging, so that the eNodeB is used for searching.
  • the air interface paging message of the calling UE sends the S-TMSI of the UE and the global CN ID to the UE.
  • the eNodeB After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface paging message to the UE, and carries the UE in the air interface paging message.
  • S-TMSI and global CN ID of the MSC/VLR After receiving the paging message of the global CN ID of the S-TMSI and the MSC/VLR of the UE, the eNodeB sends an air interface pag
  • the CN field in the paging message sent by the transmitter 91 to the eNodeB is set to "CS";
  • the CN field in the air interface paging message sent by the eNodeB to the UE is set to "CS".
  • the transmitter 91 sends a request message to the UE, and is further configured to: use the S-TMSI of the UE to send a PS domain paging message to the UE, so that the UE enters a connected state, where the PS domain paging
  • the CN field in the message is PS.
  • the transmitter 91 sends a paging message for paging the UE to the eNodeB using the S-TMSI, and the CN field in the paging message is set to "PS".
  • the eNodeB sends an air interface paging message for paging the UE to the UE by using the S-TMSI, and the CN field in the air interface paging message is set to "PS”.
  • the UE after receiving the air interface paging message, the UE sends a service request (Service Request) message to the MME through the eNodeB to respond, and the state of the UE changes from the idle state to the connected state.
  • Service Request Service Request
  • the request message sent by the transmitter 91 to the UE is a CS service notification message, where the CS service notification message includes a paging identity (Paging identity) cell and a global CN of the MSC/VLR.
  • ID the value of the paging identification cell is used to indicate that the paging response is performed using the TMSI
  • the MSC/VLR is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the request message sent by the transmitter 91 to the UE is a CS service notification message, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR, and the paging identifier cell
  • the value is used to indicate a paging response using the TMSI, which is the MSC/VLR serving the UE and the MSC/VLR is located in the MSC resource pool.
  • the transmitter 91 sends an CS service notification message to the UE by using an existing underlying signaling connection, where the CS service notification message includes a paging identifier cell and a global CN ID of the MSC/VLR.
  • the transmitter 91 is further configured to:
  • the target 2G/3G base station Transmitting, by the UE or the eNodeB, the IMSI of the UE and the global CN ID to the target 2G/3G base station, so that after the UE falls back to the target 2G/3G base station, the target 2G/3G base station according to the The global CN ID determines the MSC/VLR for the UE.
  • the transmitter 91 sends the IMSI of the UE and the global CN ID of the MSC/VLR to the target 2G/3G base station by using the eNodeB, including:
  • the receiver 92 receives the indication information that is sent by the UE and is used to indicate that the TMSI is not saved in the UE, and includes: receiving the extension sent by the UE, based on any of the foregoing first application scenario and the second application scenario. And a service request message, where the extended service request message carries indication information indicating that the TMSI is not saved in the UE.
  • the indication information is a CSFB response value.
  • the transmitter 91 sends an IMSI indication to the UE to indicate that the UE responds by using the IMSI, including: sending a CS service notification to the UE.
  • the message, the CS service notification message includes an IMSI indication for indicating that the UE responds using the IMSI.
  • the transmitter 91 when the transmitter 91 sends an IMSI indication to the UE to indicate that the UE uses the IMSI to respond, it may be sent through existing signaling (such as a CS service notification message, etc.), or may be through the MME and the UE. Newly defined signaling.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.
  • a computer-usable storage medium including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

L'invention concerne un procédé et dispositif de traitement de radiorecherche pour repli sur commutation de circuits (CSFB) en liaison descendante, de manière à résoudre le problème qui est que, dans l'état de la technique, lorsqu'une entité de gestion de mobilité (MME) recherche un équipement utilisateur (UE) par utilisation d'une S-TMSI, l'UE ne peut pas répondre à une radiorecherche par S-TMSI lancée par la MME étant donné qu'une identité temporaire d'abonné mobile (TMSI) n'est pas stockée dans l'UE. Le procédé comprend les étapes suivantes : un UE reçoit un message de requête envoyé par une MME, le message de requête étant utilisé pour demander à l'UE de lancer un processus CSFB et de faire une réponse à l'aide d'une TMSI lorsque l'UE se replie sur un réseau du domaine à commutation de circuits (CS) ; si l'UE ne stocke pas la TMSI, l'UE envoie, à la MME, des informations d'indication utilisées pour indiquer que la TMSI n'est pas stockée dans l'UE, de manière que la MME renvoie une instruction IMSI utilisée pour ordonner à l'UE de faire une réponse par utilisation d'une identité internationale d'abonné mobile (IMSI) ; et l'UE envoie, à une station de base 2G/3G cible, une réponse de radiorecherche comprenant une IMSI de l'UE dans un processus CSFB conformément à l'instruction IMSI renvoyée par la MME.
PCT/CN2014/084905 2014-08-21 2014-08-21 Procédé et dispositif de traitement de radiorecherche pour repli sur commutation de circuits (csfb) en liaison descendante WO2016026118A1 (fr)

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CN201480036834.6A CN105637954B (zh) 2014-08-21 2014-08-21 一种下行电路交换回落csfb的寻呼处理方法和设备
PCT/CN2014/084905 WO2016026118A1 (fr) 2014-08-21 2014-08-21 Procédé et dispositif de traitement de radiorecherche pour repli sur commutation de circuits (csfb) en liaison descendante

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102232317A (zh) * 2010-10-26 2011-11-02 华为技术有限公司 移动交换中心池中的寻呼处理方法及装置
CN102448043A (zh) * 2010-09-30 2012-05-09 华为技术有限公司 一种电路交换域回退方法和装置
CN102547629A (zh) * 2010-12-13 2012-07-04 中兴通讯股份有限公司 语音呼叫回退的处理方法、装置及系统

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102448043A (zh) * 2010-09-30 2012-05-09 华为技术有限公司 一种电路交换域回退方法和装置
CN102232317A (zh) * 2010-10-26 2011-11-02 华为技术有限公司 移动交换中心池中的寻呼处理方法及装置
CN102547629A (zh) * 2010-12-13 2012-07-04 中兴通讯股份有限公司 语音呼叫回退的处理方法、装置及系统

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