WO2015085545A1 - Procédé de récupération de service de commutation de paquets (ps), centre de commutation mobile (msc)/enregistreur de localisation de visiteurs (vlr) et entité de gestion de mobilité (mme) - Google Patents

Procédé de récupération de service de commutation de paquets (ps), centre de commutation mobile (msc)/enregistreur de localisation de visiteurs (vlr) et entité de gestion de mobilité (mme) Download PDF

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Publication number
WO2015085545A1
WO2015085545A1 PCT/CN2013/089246 CN2013089246W WO2015085545A1 WO 2015085545 A1 WO2015085545 A1 WO 2015085545A1 CN 2013089246 W CN2013089246 W CN 2013089246W WO 2015085545 A1 WO2015085545 A1 WO 2015085545A1
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WIPO (PCT)
Prior art keywords
mme
circuit
service
vlr
message
Prior art date
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PCT/CN2013/089246
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English (en)
Chinese (zh)
Inventor
舒林
吴晓波
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/089246 priority Critical patent/WO2015085545A1/fr
Priority to CN201380002371.7A priority patent/CN105027660B/zh
Publication of WO2015085545A1 publication Critical patent/WO2015085545A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a PS service recovery method, an MSC/VLR, and an MME.
  • the Evolved Packet System is the 3rd Generation Partnership Project (3GPP) in the second generation (The Second Generation, 2G) mobile communication network GSM/EDGE (Global System of Mobile Communication/Enhanced) Data Rate for GSM Evolution, Global System for Mobile Communications/Enhanced Data Rate (GSM Evolution) and the third generation (3G) mobile communication network UMTS (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).
  • CSFB Short Message Service over SGs
  • SMS Short Message Service over SGs
  • the CSFB technology enables the user equipment (UE) under the E-UTRAN coverage to complete the service processing through the E-UTRAN to the CS domain of the 2G/3G network when the circuit switched (CS) voice service needs to be processed. SMS over SGs
  • the technology allows UEs residing under E-UTRAN to reuse existing CS domain devices to implement CS short message transmission.
  • the UE initiates a CSFB request to the MME in the E-UTRAN, that is, initiates an Extended Service Request message to the current serving MME; (2) If the UE or the network side does not support the PS (Packet Switched) handover, the UE's Evolved Node B (eNodeB) cannot perform the PS handover procedure to drop the UE back to the 2G/3G network. Trying to drop the UE back to the 2G/3G network by performing other processes, such as a redirect process or a Cell Change Order (CCO) process;
  • a redirect process or a Cell Change Order (CCO) process
  • the serving eNodeB selects a GERAN (GSM EDGE Radio Access Network) cell that does not support Dual Transfer Mode (DTM) for the UE, or the UE does not support the DTM in the target GERAN cell, the serving eNodeB of the UE indicates the service.
  • MME Mobility Management Entity
  • PS service is unavailable in the target cell;
  • the serving MME deactivates all Guaranteed Bit Rate (GBR) bearers, suspends all non-GBR bearers, and sets the UE context to a suspended state;
  • GLR Guaranteed Bit Rate
  • the UE cannot successfully fall back to the 2G/3G network, or the UE cannot fall to the appropriate 2G/3G cell after falling back to the CS domain of the 2G/3G network, or the UE receives the upper layer transmission when it decides to fall back to the 2G/3G network. If the CSFB service request is cancelled, the CSFB process will fail, and the UE cannot send uplink signaling to the MSC/VLR in the CS domain of the 2G/3G network.
  • the UE performs the existing cell selection/reselection procedure and returns to the E-UTRAN, and returns to a TA in the Tracking Area List (TA list) saved by the UE.
  • TA list Tracking Area List
  • step (6) the UE returns to the TA in the TA list, so the Tracking Area Updating (TAU) request is not initiated after returning to the E-UTRAN, so the MME does not know that the UE has returned to the E- UTRAN.
  • step (4) the MME has placed the UE's context in a suspended state, which may cause the following problems:
  • the network side discards the downlink PS service because the UE is in the suspended state, which causes the downlink PS service to fail. At the same time, the network side also discards the downlink CS service paging because the UE is in the suspended state, which causes the downlink CS service to fail.
  • the embodiment of the present invention provides a PS service recovery method, an MSC/VLR, and an MME, which are used to solve the first aspect of the present invention, and provide a packet switched PS service recovery method, including: a source mobile switching center/visit location register MSC/ The VLR learns that the user equipment UE initiates a circuit switched fallback request from the evolved universal mobile communication system terrestrial radio access network E-UTRAN network; the source MSC/VLR determines that the circuit switched message sent by the UE is not received, the circuit switching The message is a message sent by the UE from the dropped circuit switched domain after initiating the circuit switched fallback request;
  • the source MSC/VLR sends the indication information to the mobility management entity MME, and is used to instruct the MME to recover the PS service of the suspended UE according to the indication information.
  • the source MSC/VLR learns that the UE initiates a circuit switch fallback request from the E-UTRAN network, and the method includes: the source MSC/VLR receiving the inclusion that is sent by the MME SGs interface message describing UE identity information.
  • the source MSC/VLR determines that the circuit-switched message sent by the UE is not received, and includes:
  • the source MSC/VLR After receiving the SGs interface message, the source MSC/VLR starts a timer; when the timer expires, the UE is not received, and after sending the circuit switch fallback request, it is sent from the circuit switched domain that is dropped back. Message; or
  • the source MSC/VLR After receiving the SGs interface message, the source MSC/VLR starts the timer; when the timer expires, setting a flag bit; the flag bit is used to indicate that the UE is not received at the initiator station. a message sent from a falling circuit switched domain after a circuit switched fallback request; or
  • the source MSC/VLR After receiving the SGs interface message, the source MSC/VLR records the system time; after receiving the circuit switch fallback request, the UE does not receive the set time duration after the recorded system time. The message sent back by the circuit switched domain.
  • the method further includes: before the timer expires, the source MSC/VLR sends a target MSC/VLR to send Sending the proof message, stopping the running timer; or, before the timer expires, the source MSC/VLR stops the running SGs if receiving the SGs paging reject message sent by the MME Timer.
  • the method further includes: deleting, by the source MSC/VLR, the sending certification message sent by the target MSC/VLR, deleting The system time recorded; or
  • the source MSC/VLR deletes the recorded system time if receiving the SGs paging reject message sent by the MME within the set duration.
  • the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.
  • the circuit switching fallback request is a downlink circuit And exchanging a fallback request, where the circuit switched message is a paging response message or a location update message sent by the UE from the circuit switched domain that is dropped after initiating the downlink circuit switching fallback request; or, if the circuit switching fallback request is An uplink circuit switched fallback request, where the circuit switched message is a service request message or a location update message sent by the UE from the dropped circuit switched domain after initiating the uplink circuit switch fallback request.
  • a second aspect of the present invention provides a packet switching PS service recovery method, including: a mobility management entity MME suspending a PS service of the UE in a circuit switched fallback procedure initiated by a user equipment UE;
  • the MME recovers the suspended PS service of the UE according to the indication information.
  • the method further includes: the MME is initiated by the UE In the circuit switching fallback process, receiving indication information sent by the base station, where the The indication information is used to indicate that the target cell in which the PS service is dropped in the circuit switching is unavailable.
  • the MME combines the PS service of the UE with the second aspect or the first in a circuit switched fallback procedure initiated by the user equipment UE a possible implementation or a second possible implementation manner.
  • the MME recovers the suspended information according to the indication information.
  • the PS service of the UE includes: the MME clearing the suspended state of the context of the UE.
  • a third aspect of the present invention provides a packet switched PS service recovery method, including: a mobility management entity MME, in a circuit switched fallback procedure initiated by a user equipment UE
  • the MME keeps the PS service of the UE in a suspended state in a first time interval; when the MME ends, the MME restores the suspended UE
  • the method further includes: the MME in the circuit switching In the fallback process, the indication information sent by the base station is received, where the indication information is used to indicate that the target cell in which the PS service is dropped in the circuit switch is unavailable.
  • the MME suspends the PS service of the UE in a circuit-switched fallback procedure initiated by the UE, and the packet combines the third aspect.
  • the MME keeps the PS service of the UE in a suspended state in a first time interval, including:
  • the MME When the MME suspends the PS service of the UE, the MME starts a suspend timer;
  • the method further includes: When receiving the uplink signaling message sent by the UE, the MME stops the pending timer that is running; or
  • the MME When receiving the suspend request message sent by the target serving GPRS support node SGSN, the MME stops the suspend timer that is running.
  • the MME restores the suspended UE when the first time interval ends.
  • the PS service includes: the MME clearing the suspended state of the context of the UE when the suspension timer expires.
  • the MME is maintained in the first time interval.
  • the PS service of the UE is in a suspended state, including:
  • the MME records the system time when the PS service of the UE is suspended
  • the PS service of the UE is kept in a suspended state within a set duration after the system time is recorded.
  • the method further includes:
  • the MME When receiving the uplink signaling message sent by the UE, the MME deletes the recorded system time; or
  • the MME When receiving the suspend request message sent by the target service GPRS support node SGSN, the MME deletes the recorded system time.
  • the MME restores the suspended UE when the first time interval ends.
  • the PS service includes: the MME clears the suspended state of the context of the UE when the MME reaches a set duration after the recorded system time.
  • a mobile switching center/visiting location register MSC/VLR including:
  • a learning module configured to learn that the user equipment UE is grounded from the evolved universal mobile communication system
  • the incoming E-UTRAN network initiates a circuit switched fallback request
  • a determining module configured to determine that a circuit switched message sent by the UE is not received, where the circuit switching message is a message sent by the UE from a circuit switched domain that is dropped after initiating the circuit switched fallback request;
  • a sending module configured to send the indication information to the mobility management entity MME, to instruct the MME to resume the packet switched PS service of the suspended UE according to the indication information.
  • the obtaining module is specifically configured to: receive an SGs interface message that is sent by the MME and that includes the UE identity information.
  • the determining module is specifically configured to:
  • the flag bit is used to indicate that the UE is not received after initiating the circuit switched fallback request a message sent from a falling circuit switched domain;
  • the apparatus further includes a first operating module, configured to: before receiving the timer, if receiving the sending of the target MSC/VLR transmission The proof message stops the running timer; or, before receiving the timer, if the SGs page reject message sent by the MME is received, the running timer is stopped.
  • the apparatus further includes a first operating module, configured to: if the target MSC/VLR sends the sending, within the set duration Proof message, deleting the system time of the record; or, within the set duration, if Receiving an SGs Paging Reject message sent by the MME, deleting the recorded system time.
  • the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.
  • the circuit switching fallback request is a downlink circuit Exchanging a fallback request
  • the circuit switched message being a paging response message or a location update message sent by the UE from the falling circuit switched domain after initiating the downlink circuit switch fallback request;
  • the circuit switched message is a service request message or a location update message sent by the UE from the dropped circuit switched domain after initiating the uplink circuit switch fallback request.
  • a fifth aspect of the present invention provides a mobility management entity MME, including:
  • a first suspension module configured to suspend the packet switched PS service of the UE in a circuit switched fallback procedure initiated by the user equipment UE;
  • a first receiving module configured to receive indication information sent by the source mobile switching center/visiting location register MSC/VLR;
  • a first recovery module configured to recover, according to the indication information, the PS service of the suspended UE.
  • the first receiving module is further configured to: receive the indication information sent by the base station in the circuit switching fallback process initiated by the UE, where the indication information is A target cell for indicating that the PS service is falling back in the circuit switching is unavailable.
  • the first suspension module is specifically configured to: mark a context of the UE as a suspended state.
  • the first recovery module is specifically configured to: clear the context of the UE Suspended state.
  • MME mobility management entity
  • a second suspension module configured to be used in a circuit switched fallback process initiated by the user equipment UE
  • a maintaining module configured to keep the PS service of the UE in a suspended state in a first time interval
  • a second recovery module configured to restore the suspended UE when the first time interval ends PS business.
  • the apparatus further includes: a second receiving module, configured to: receive, in the circuit switching fallback process, indication information sent by a base station, where the indication information is used The target cell indicating that the PS traffic is falling back in the circuit switched is not available.
  • the second suspension module is specifically configured to: mark a context of the UE as a suspended state.
  • the maintaining module is specifically configured to: when the PS service of the UE is suspended And starting a suspend timer; maintaining the PS service of the UE in a suspended state in an operation interval of the suspending timer.
  • the MME further includes a second operation module, configured to: when the uplink signaling message sent by the UE is received, stop running The suspend timer; or, when receiving the suspend request message sent by the target serving GPRS support node SGSN, stopping the suspending timer that is running.
  • the second recovery module is specifically configured to: when the suspension timer expires, clear the The suspended state of the context of the UE.
  • the maintaining module is specifically configured to: when suspending the PS service of the UE Recording system time; keeping the PS service of the UE in a suspended state within a set time period after recording the system time.
  • the MME The second operation module is further configured to: when receiving the uplink signaling message sent by the UE, deleting the recorded system time; or, when receiving the suspension request message sent by the target serving GPRS support node SGSN , delete the system time of the record.
  • the second recovery module is specifically configured to: set a duration after the system time of the record is reached The pending state of the context of the UE is cleared.
  • a mobile switching center/visiting location register MSC/VLR including:
  • a first memory for storing instructions
  • a first interface configured to: indicate that the user equipment UE initiates a circuit-switched fallback request from the E-UTRAN network of the evolved universal mobile communication system, and sends indication information to the mobility management entity MME, where Declaring information to recover the packet switched PS service of the UE that is suspended;
  • a first processor configured to execute, by the instruction, that a circuit-switched message sent by the UE is not received, where the circuit-switched message is sent by the UE from a circuit-switched domain that is dropped after initiating the circuit-switched fallback request Message.
  • the first interface is specifically configured to: receive an SGs interface message that is sent by the MME and that includes the UE identity information.
  • the first processor is specifically configured to:
  • Executing the instruction after receiving the SGs interface message, starting a timer; when the timer expires, failing to receive the UE sending the circuit switched domain from the fallback circuit domain after initiating the circuit switch fallback request Message; or
  • Executing the instruction after receiving the SGs interface message, starting the timer; when the timer expires, setting a flag bit; the flag bit is used to indicate that the UE is not receiving the a message sent from a falling circuit switched domain after a circuit switched fallback request; or
  • Executing the instruction after receiving the SGs interface message, recording system time; Within the set duration after the system time, the message sent by the UE from the falling circuit switched domain after initiating the circuit switched fallback request is not received.
  • the first processor is further configured to: execute the instruction, if the target MSC/VLR is sent before the timer expires Sending a certificate message, stopping the running timer; or executing the instruction, if the SGs paging rejection message sent by the MME is received before the timer expires, stopping the running timing Device.
  • the first processor is further configured to: execute the instruction, if the target MSC/VLR is sent within the set duration Sending the certification message, deleting the system time of the record; or executing the instruction, if the SGs paging rejection message sent by the MME is received within the set duration, the recorded system time is deleted.
  • the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.
  • the circuit switching fallback request is a downlink circuit And exchanging a fallback request, where the circuit switched message is a paging response message or a location update message sent by the UE from the circuit switched domain that is dropped after initiating the downlink circuit switching fallback request; or, if the circuit switching fallback request is An uplink circuit switched fallback request, where the circuit switched message is a service request message or a location update message sent by the UE from the dropped circuit switched domain after initiating the uplink circuit switch fallback request.
  • An eighth aspect of the present invention provides a mobility management entity MME, including:
  • a second memory for storing instructions
  • a second processor configured to perform the instruction to suspend a packet switched PS service of the UE in a circuit switched fallback procedure initiated by the user equipment UE, and recover the suspended PS of the UE according to the indication information business;
  • the second interface is configured to receive the indication information sent by the source mobile switching center/visit location register MSC/VLR.
  • the second interface is further configured to: receive the indication information sent by the base station in the circuit switching fallback process initiated by the UE, where the indication information is used by The target cell indicating that the PS service is falling back in the circuit exchange is unavailable.
  • the second processor is specifically configured to: execute the instruction to mark the context of the UE as a suspended state.
  • the second processor is specifically configured to: execute the instruction to clear the
  • the suspended state of the context of the UE is the suspended state of the context of the UE.
  • a mobility management entity including:
  • a third memory for storing instructions
  • a third processor configured to: suspend the packet switched PS service of the UE in a circuit switched fallback procedure initiated by the user equipment UE, and keep the PS service of the UE in a first time interval a state of up, and at the end of the first time interval, restoring the PS service of the suspended UE.
  • the apparatus further includes a third interface, configured to receive indication information sent by the base station in the circuit switching fallback process, where the indication information is used to indicate the PS The target cell in which the service is dropped back in the circuit is not available.
  • the third processor is further configured to: execute the instruction to mark a context of the UE as a suspended state.
  • the third processor is further configured to: execute the instruction, where When the PS service of the UE is suspended, the suspend timer is started; in the running interval of the suspend timer, the PS service of the UE is kept in a suspended state.
  • the third The processor is further configured to: execute the instruction, when the receiving the uplink signaling message sent by the UE, stop the running the suspension timer; or execute the instruction, when receiving the target service GPRS support When the suspend request message sent by the node SGSN is stopped, the suspend timer that is running is stopped.
  • the third processor is further configured to: execute the instruction, where the suspension timer is super At time, the suspended state of the context of the UE is cleared.
  • the third processor is further configured to: execute the instruction, where When the PS service of the UE is suspended, the system time is recorded; and within the set duration after the system time is recorded, the PS service of the UE is kept in a suspended state.
  • the third processor is further configured to: execute the instruction, and delete the record when receiving the uplink signaling message sent by the UE The system time is executed; or, the instruction is executed, and when the suspension request message sent by the target serving GPRS support node SGSN is received, the system time of the record is deleted.
  • the third processor is further configured to: execute the instruction, when the system time of the record is reached When the subsequent set duration is long, the suspended state of the context of the UE is cleared.
  • the source MSC/VLR may instruct the MME to resume the suspended device.
  • the PS service of the UE is described to ensure the normal operation of the subsequent PS services. This also solves the technical problem in the prior art that the downlink PS service fails due to the UE being suspended.
  • the PS service recovery method in the embodiment of the present invention can be applied to each version of the UE, and is not limited in use, and has a wide application range.
  • FIG. 1 is a main flowchart of a PS service recovery method according to an embodiment of the present invention
  • FIG. 2 is an interaction flowchart of a PS service recovery method according to an embodiment of the present invention
  • FIG. 3 is a main flowchart of a PS service recovery method according to an embodiment of the present invention
  • FIG. 4 is a main flowchart of a PS service recovery method according to an embodiment of the present invention
  • FIG. 5 is an interaction flowchart of a PS service recovery method according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of an MSC/VLR according to an embodiment of the present invention.
  • FIG. 7 is a structural diagram of an MME according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of an MME according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of an MSC/VLR according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of an MME according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of an MME according to an embodiment of the present invention. detailed description
  • the PS service recovery method in the embodiment of the present invention includes: the source mobile switching center/visit location register MSC/VLR learns that the user equipment UE initiates a circuit switching fallback request from the evolved universal mobile communication system terrestrial radio access network E-UTRAN network; Determining that the source MSC/VLR determines that the circuit switched message sent by the UE is not received, and the circuit switched message is a message sent by the UE from the circuit switched domain that is dropped after initiating the circuit switched fallback request; the source MSC The /VLR sends the indication information to the mobility management entity MME, and is used to instruct the MME to restore the suspended PS service of the UE according to the indication information.
  • the source MSC/VLR may instruct the MME to resume the suspended device.
  • the PS service of the UE is described to ensure the normal operation of the subsequent PS services. This also solves the technical problem in the prior art that the downlink PS service fails due to the UE being suspended.
  • the PS service recovery method in the embodiment of the present invention can be applied to each version of the UE, and is not limited in use, and has a wide application range.
  • the techniques described herein can be used in a variety of communication systems, such as current 2G, 3G communication systems and next generation communication systems, such as Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA, Code Division Multiple). Access system, time division multiple access (TDMA, Time Division Multiple Access) system, Wideband Code Division Multiple Access (WCDMA), Frequency Division Multiple Access (FDMA), Frequency Division Multiple Addressing system, Orthogonal Frequency OFDM (Orthogonal Frequency-Division Multiple Access) system, single carrier FDMA (SC-FDMA) system, General Packet Radio Service (GPRS) system, Long Term Evolution (LTE) system , and other such communication systems.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDM Orthogonal Frequency OFDM
  • SC-FDMA single carrier FDMA
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the user side device which may be a wireless terminal or a wired terminal, may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or other processing device connected to the wireless modem.
  • the wireless terminal can be accessed via a wireless access network (eg,
  • RAN Radio Access Network
  • core networks may be mobile terminals, such as mobile phones (or “cellular” phones) and computers with mobile terminals, for example, may be portable, pocket-sized , handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with a wireless access network.
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • a wireless terminal may also be called a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, or User Equipment (UE).
  • UE User Equipment
  • the term "user equipment, cartridge is referred to as UE" is used herein.
  • the network side device may be, for example, a base station, or may be a relay device, or may be an MSC/VLR (Mobile Service Switching Center/Visit Location Register), or may be an MME (Mobility Management Entity), or may be an SGSN (Serving General) Packet Radio Service surpport node, or other network side device, where the MSC and the VLR are usually set to the same network element, called MSC/VLR, or the cylinder is called a VLR. It can also be called a MSC.
  • a base station e.g., an access point
  • a base station can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), this application is not limited.
  • the LTE network Since the LTE network only supports PS data services, when the UE performs data services in the LTE network or is in an idle state, if the UE wants to initiate or receive circuit domain services (including voice calls, supplementary services, or location services, etc.), Performing a circuit switched fallback CSFB process drops the UE from LTE to the 2G/3G network, so that the UE completes the circuit domain service in the 2G/3G network. After the end of the circuit domain service (the UE's underlying link established by the CSFB service in the 2G/3G network is released means that the circuit domain service ends), the terminal needs to return to the LTE network to continue the data service on the LTE network.
  • circuit domain services including voice calls, supplementary services, or location services, etc.
  • the CSFB service specifically refers to a CS service that is performed after the UE that resides in the LTE network initiates the CSFB process to fall back to the 2G/3G network, and the CSFB service includes the uplink CSFB service.
  • the downlink CSFB service for example, the UE receives a downlink CSFB service triggered by a voice call page or an uplink CSFB service triggered by an active voice call on the LTE network.
  • the source MSC/VLR is an MSC/VLR that is successfully registered by the UE in the joint registration process, that is, the service when the UE is camped on the LTE network after the joint registration is successful.
  • MSC/VLR also known as Registered MSC/VLR.
  • the serving MSC/VLR is the MSC/VLR, also called the target MSC/VLR, for the UE to initiate the CSFB process to fall back to the 2G/3G network and perform the services provided by the CS service.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association that describes the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, and both A and B exist, exist alone B these three situations.
  • the character "/" in this article generally means that the contextual object is an "or" relationship.
  • an embodiment of the present invention provides a PS service recovery method, where the main processes of the method are as follows:
  • Step 101 The source MSC/VLR learns that the UE initiates a circuit switched fallback request from the E-UTRAN network.
  • FIG. 2 the interaction flowchart of the PS service recovery method in the embodiment of the present invention is shown in FIG. 2 .
  • UEs residing in E-UTRAN and supporting CSFB and/or SMS over SGs need to initiate a joint registration procedure to implement the EPC network PS domain and the 2G/3G network CS domain. registered.
  • the CSFB service of the uplink and downlink and the short message service of the uplink and downlink can be initiated normally.
  • the user side device (hereinafter referred to as UE) has successfully jointly registered to the MME and the MSC/VLR.
  • the MSC/VLR here may be referred to as the source MSC/VLR.
  • the CSFB process can have an uplink (MO-CSFB) and a downlink (MT-CSFB), which are shown separately in Figure 2. It should be noted that this is two separate processes, and Figure 2 is drawn into a figure for convenience of description. The following are introduced separately.
  • the UE Originated Mobile Originating (MO) CSFB process is shown in the section of the dotted line 1 in Figure 2.
  • the UE has successfully jointly registered to the MME and the source MSC/VLR.
  • the UE is in the E-UTRAN main
  • the extended service request message is sent to the MME, as shown in step 1 of FIG.
  • the MME sends an SGs interface message to the source MSC/VLR, that is, the source MSC/VLR learns that the UE initiates a circuit switch fallback request from the E-UTRAN network, which may be specifically
  • the MSC/VLR receives the SGs interface message that is sent by the MME and includes the UE identity information.
  • the SGs interface message may be an SGs uplink circuit switching fallback indication message, as shown in step lb in FIG. 2 .
  • the SGs interface message may specifically be an SGs service request message.
  • the SGs uplink circuit switched fallback indication message and the SGs service request message are intended to inform the source MSC/VLR that the UE initiates an MO-CSFB service request.
  • the UE has successfully jointly registered to the MME and the source MSC/VLR.
  • the source MSC/VLR sends an SGs paging request to the MME, as shown in step 2a in FIG.
  • the MME performs different actions according to the current connection state of the UE: if the UE is currently in an idle state, the MME first performs a paging procedure, and the UE is The idle state is changed to the connected state, as shown in steps 2b and 2c in FIG. 2, the UE sends the extended service request message to the MME, and the MME sends the extended service request message to the source.
  • the MSC/VLR sends an SGs service request message, as shown in step 2d in FIG. 2; if the UE is currently in the connected state, the MME sends a CS notification message to the UE, and the UE replies to the MME.
  • the service request message is extended, and then the MME sends the SGs service request message to the source MSC/VLR, as shown in step 2d in FIG.
  • the source MSC/VLR learns that the UE initiates a circuit switch fallback request from the E-UTRAN network, and specifically that the MSC/VLR receives the SGs interface message that is sent by the MME and includes the UE identity information.
  • the SGs interface message may specifically refer to the SGs service request message.
  • the SGs interface message may be the SGs service request message, or may be an SGs uplink circuit switch fallback indication message.
  • Step 102 The source MSC/VLR determines that the circuit-switched message sent by the UE is not received, and the circuit-switched message is a message that is sent by the UE from the circuit-switched domain that is dropped after initiating the circuit-switched fallback request.
  • the source MSC/VLR determines that the circuit-switched message sent by the UE is not received, and specifically: the source MSC/VLR starts a timer after receiving the SGs interface message, where When the timer expires, the message sent by the UE from the circuit switched domain that has been dropped after the circuit switchback request is initiated is received; or the source MSC/VLR starts after receiving the SGs interface message.
  • the source MSC/VLR After receiving the SGs interface message, the source MSC/VLR records the system time, and does not receive the UE from the fallback after initiating the circuit switch fallback request within a set duration after the system time is recorded. The message sent by the circuit switched domain.
  • the source MSC/VLR may start the timer to monitor whether the UE can successfully access in the CS domain of the 2G/3G network, as shown in step 3 in FIG.
  • the monitoring of whether the UE can be successfully accessed in the CS domain of the 2G/3G network includes: for the MT-CSFB, the source MSC/VLR starts the timer, and is used to monitor whether the UE can be in the 2G/3G network.
  • the CS domain sends a paging response message or a location update message; for MO-CSFB, the source MSC/VLR starts the timer to monitor whether the UE can send a service request message or location in the CS domain of the 2G/3G network.
  • the update message specifically, the service request message may be a Connection Management (CM) service request message.
  • CM Connection Management
  • the paging response message or the connection management service request message is a message sent by the UE from the circuit switched domain that is dropped.
  • the source MSC/VLR starts the timer, for the MT-CSFB, if the UE can send a paging response message in the 2G/3G network CS domain, that is, if the source MSC/VLR can receive The paging response message or the location update message indicates that the UE has successfully dropped back to the 2G/3G network, and the source MSC/VLR may turn off the timer. And if the source MSC/VLR does not receive the paging response message and does not receive the location update message, the source MSC/VLR keeps the timer continuously counting until timeout.
  • the source MSC/VLR starts the timer, for the MO-CSFB, if the UE can send the service request message or the location update message in the 2G/3G network CS domain, ie if The source MSC/VLR can receive the service request message or the location update message. Then, the UE has successfully dropped back to the 2G/3G network, and the source MSC/VLR may turn off the timer. And if the source MSC/VLR does not receive the service request message and does not receive the location update message, the source MSC/VLR keeps the timer continuously counting until timeout.
  • the method may further include: receiving, by the MME, the indication information sent by the base station in the circuit-switched fallback process initiated by the UE, where the indication information is used to indicate that the PS service is in the circuit switching The target cell that is dropped back is unavailable, and the MME sets the PS service of the UE to a suspended state according to the indication information.
  • the MME after receiving the extended service request message sent by the UE, the MME continues to execute the processes required by the other MT/MO-CSFB, for example, according to:
  • the connection status of the UE sends the CSFB indication information to the eNodeB through different messages.
  • the eNodeB After receiving the CSFB indication information of the MME, the eNodeB does not support the PS handover, and the selected target cell is a GERAN cell, and the UE or the target cell does not support the DTM, The eNodeB sends the indication information to the MME to indicate that the MME is unavailable in the target cell.
  • the MME initiates deactivation of all GBR bearer processes according to the indication information, and reserves and suspends the flow of all non-GBR bearers, and sets the context of the UE to a suspended state, that is, the UE.
  • the PS service is suspended, as shown in step 4 in Figure 2.
  • the method may further include: before the timer expires, the source MSC/VLR receives the first message, where The first message is used to indicate that the UE has dropped back to the 2G/3G network, or the first message is used to indicate that the user refuses to accept the CSFB procedure; the source MSC/VLR turns off the timer according to the first message.
  • the source MSC/VLR receives the Send Identification message sent by the target MSC/VLR, the steps in FIG. 2 are performed. 5a, or the source MSC/VLR receives the SGs paging reject message from the MME, as in step 5b of FIG. 2, the source MSC/VLR stops running.
  • the timer is turned off, that is, the timer is turned off, as shown in step 5c in FIG.
  • the source MSC/VLR if the source MSC/VLR does not start the timer, the system time is recorded only after receiving the SGs interface message, after the system time is recorded,
  • the method may include: the source MSC/VLR receiving the first message, where the first message is used to indicate that the UE has dropped back to the 2G/3G network, or the first message
  • the source MSC/VLR deletes the record according to the first message, that is, deletes the recorded system time.
  • the target MSC/VLR provides an actual serving MSC/VLR for the UE, and the source MSC/VLR can receive the target MSC/VLR.
  • Sending the sending certification message indicating that the UE has successfully accessed in the CS domain of the 2G/3G network, but only the serving MSC/VLR, that is, the UE has successfully dropped back to the 2G/3G network, so the The source MSC/VLR can either turn off the timer or delete the record.
  • the source MSC/VLR can receive the SGs paging reject message sent by the MME, and the reason for the rejection is that the user refuses to accept the MT-CSFB, it indicates that the user has rejected the MT-CSFB, MT-CSFB The flow has been terminated and the source MSC/VLR can either close the timer or delete the record.
  • the first message may refer to the sending proof message, or may also refer to the SGs paging reject message.
  • Step 103 The source MSC/VLR sends indication information to the MME, to indicate that the MME recovers the PS service of the suspended UE according to the indication information.
  • the source MSC/VLR determines that the circuit-switched message sent by the UE is not received, the source MSC/VLR sends the indication information to the MME, to indicate the MME, in the current CSFB.
  • the source MSC/VLR fails to receive the message sent by the UE from the target circuit switched CS domain, as shown in step 6 in FIG. 2, the MME initiates, according to the indication information, the UE.
  • the The source MSC/VLR sends the indication information to the MME, where the indication information is used to indicate the MME, in the current CSFB procedure, the source MSC/VLR fails to receive the UE from the target CS domain ( That is, the message sent by the CS domain of the 2G/3G network includes: for the MT-CSFB, the source MSC/VLR fails to receive the paging response message sent by the UE in the CS domain of the 2G/3G network; MO-CSFB, the source MSC/VLR fails to receive the service request message sent by the UE in the CS domain of the 2G/3G network.
  • the source MSC/VLR indirectly determines whether the UE is in accordance with the sending certification message sent by the target MSC/VLR.
  • the target CS domain sent a message. That is, if the source MSC/VLR receives the transmission certification message sent by the target MSC/VLR, the source MSC/VLR determines that the message sent by the UE from the target CS domain is received, and if The source MSC/VLR does not receive the sending certification message sent by the target MSC/VLR, and the source MSC/VLR determines that the message sent by the UE from the target CS domain is not received.
  • the MME initiates a PS service recovery procedure for the UE according to the indication information, and clears the flag that the UE is suspended, and subsequently is related to the UE.
  • the MT CS service and the MT PS service are processed as usual, thereby ensuring that the subsequent CS service and PS service are performed normally.
  • the source MSC/VLR monitors the UE, and if the circuit switched message sent by the UE is not received, the source MSC/VLR determines to restore the UE.
  • the suspended PS service ensures the normal operation of the subsequent PS service and CS service. And, if a message indicating that the UE has successfully accessed in 2G/3G is received, the PS service that is suspended by the UE is prohibited from being restored, and normal communication of the UE is guaranteed. And if the UE successfully accesses the 2G/3G network, the circuit-switched message is sent to the source MSC/VLR, and the source MSC/VLR may directly determine whether the circuit-switched message is received according to whether the circuit-switched message is received. Whether the UE is successfully accessed, if the AP is not accessed, the suspended PS service of the UE is restored, and the processing procedure is relatively fast, and no message is required to be transferred.
  • Embodiment 2 Referring to FIG. 3, based on the same inventive concept, an embodiment of the present invention continues to provide a PS service recovery method, and the main processes of the method are as follows:
  • Step 301 The MME suspends the PS service of the UE in a circuit-switched fallback procedure initiated by the UE.
  • the MME may further include: the MME in the circuit switching fallback process And receiving the indication information sent by the base station, where the indication information is used to indicate that the target cell in which the PS service is dropped in the circuit switch is unavailable.
  • the indication information here is the indication information sent by the eNodeB to the MME in Embodiment 1.
  • the MME after receiving the extended service request message sent by the UE, the MME continues to execute the processes required by the other MT/MO-CSFB, for example, according to:
  • the connection status of the UE sends the CSFB indication information to the eNodeB through different messages.
  • the eNodeB After receiving the CSFB indication information of the MME, if the UE or the network side does not support the PS handover, and the selected target cell is a GERAN cell, and the UE or the target cell does not support the DTM, the eNodeB does not support the DTM.
  • the eNodeB sends the indication information to the MME to indicate that the MME is unavailable in the target cell.
  • the MME suspends the PS service of the UE in the circuit-switched fallback process initiated by the UE, including: the MME marking the context of the UE as a suspended state.
  • the MME initiates deactivation of all GBR bearer processes according to the indication information sent by the eNodeB, and reserves and suspends the flow of all non-GBR bearers, and sets the context of the UE to a suspended state, that is, The PS service of the UE is suspended, as shown in step 4 in FIG.
  • Step 302 The MME receives the indication information sent by the source MSC/VLR.
  • the source MSC/VLR determines that the circuit-switched message sent by the UE is not received, the source MSC/VLR sends the indication information to the MME, to indicate the MME, in the current CSFB.
  • the source MSC/VLR fails to receive the message sent by the UE from the target circuit switched CS domain, as shown in step 6 in FIG. Step 303: The MME recovers the suspended PS service of the UE according to the indication information.
  • the MME recovers the PS service of the suspended UE according to the indication information, and the method includes: the MME clearing the suspended state of a context of the UE.
  • the MME initiates a PS service recovery process for the UE according to the indication information, and clears the identifier that the UE is suspended, as shown in step 7 in FIG. 2 .
  • the MME initiates a PS service recovery procedure for the UE according to the indication information, and clears the flag that the UE is suspended, and subsequently is related to the UE.
  • the MT CS service and the MT PS service are processed as usual, thereby ensuring that the subsequent CS service and PS service are performed normally.
  • an embodiment of the present invention provides a PS service recovery method, and the main processes of the method are as follows:
  • Step 401 The MME suspends the PS service of the UE in a circuit-switched fallback procedure initiated by the UE.
  • the CSFB process can have an uplink (MO-CSFB) and a downlink (MT-CSFB), which are shown separately in Figure 5. It should be noted that this is two separate processes, and Figure 5 is drawn into a figure for convenience of description. The following are introduced separately.
  • the UE Originated Mobile Originating (MO) CSFB process is shown in the section of the dotted line 1 in Figure 5.
  • the UE has successfully jointly registered to the MME and the source MSC/VLR.
  • the UE actively sends an extended service request message to the MME in the E-UTRAN, as shown in step 5 of FIG.
  • the MME sends an SGs interface message to the source MSC/VLR, that is, the source MSC/VLR learns that the UE initiates a circuit switch fallback request from the E-UTRAN network, which may be specifically Means that the MSC/VLR receives an SGs interface message that is sent by the MME and includes the identity information of the UE,
  • the SGs interface message may specifically refer to the SGs uplink circuit switching fallback indication message, as shown in step lb in FIG.
  • the SGs interface message may specifically be an SGs service request message.
  • the SGs uplink circuit switched fallback indication message and the SGs service request message are intended to inform the source MSC/VLR that the UE initiates an MO-CSFB service request.
  • the UE has successfully jointly registered to the MME and the source MSC/VLR.
  • the source MSC/VLR sends an SGs paging request to the MME, as shown in step 2a in FIG.
  • the MME performs different actions according to the current connection state of the UE: if the UE is currently in an idle state, the MME first performs a paging procedure, and the UE is The idle state is changed to the connected state, as shown in steps 2b and 2c in FIG. 5, the UE sends the extended service request message to the MME, and the MME sends the extended service request message to the source.
  • the MSC/VLR sends an SGs service request message, as shown in step 2d in FIG. 5; if the UE is currently in the connected state, the MME sends a CS notification message to the UE, and the UE replies to the MME.
  • the service request message is extended, and then the MME sends the SGs service request message to the source MSC/VLR, as shown in step 2d in FIG.
  • the MME may further include: the MME in the circuit switching fallback process And receiving the indication information sent by the base station, where the indication information is used to indicate that the target cell in which the PS service is dropped in the circuit switch is unavailable.
  • the indication information here is the indication information sent by the eNodeB to the MME in Embodiment 1.
  • the MME after receiving the extended service request message sent by the UE, the MME continues to execute the processes required by the other MT/MO-CSFB, for example, according to:
  • the connection status of the UE sends the CSFB indication information to the eNodeB through different messages.
  • the eNodeB After receiving the CSFB indication information of the MME, if the UE or the network side does not support the PS handover, and the selected target cell is a GERAN cell, and the UE or the target cell does not support the DTM, the eNodeB does not support the DTM.
  • the eNodeB sends the indication information to the MME to indicate that the MME is unavailable in the target cell.
  • the ⁇ suspending the PS service of the UE in the circuit-switched fallback procedure initiated by the UE includes: deleting the context of the UE as a suspended state.
  • the ⁇ initiates deactivation of all GBR bearer processes according to the indication information sent by the eNodeB, and reserves and suspends the flow of all non-GBR bearers, and sets the context of the UE to a suspended state, that is, The PS service of the UE is suspended, as shown in step 4 in FIG.
  • Step 402 The MME keeps the PS service of the UE in a suspended state in a first time interval.
  • the MME keeps the PS service of the UE in a suspended state in the first time interval, and the MME may suspend the PS service of the UE.
  • the suspend timer is started; in the running interval of the suspend timer, the PS service of the UE is kept in a suspended state, as shown in step 4 in FIG. 5 .
  • the method may further include: Before the timer expires, the MME receives the second message, where the second message may be an uplink signaling message sent by the UE, and is used to indicate that the UE has returned to the LTE network after the CSFB service ends. Or the second message may be a Suspend Request message, which is used to indicate that the UE initiates a PS suspension procedure to the target SGSN after falling back to the 2G/3G network, and the MME is configured according to the The second message closes the suspend timer.
  • the second message may be an uplink signaling message sent by the UE, and is used to indicate that the UE has returned to the LTE network after the CSFB service ends.
  • the second message may be a Suspend Request message, which is used to indicate that the UE initiates a PS suspension procedure to the target SGSN after falling back to the 2G/3G network, and the MME is configured according to the The second message closes the suspend timer.
  • the MME when receiving the uplink signaling message sent by the UE, the MME stops the suspended timer that is running, or when the target service is received When the GPRS supports the suspend request message sent by the node SGSN, the MME stops the suspending timer that is running.
  • the MME receives an uplink signaling message sent by the UE (the uplink signaling message is, for example, a TAU request message, a service request message, etc.), as shown in FIG. 5 In step 5a, or the MME receives a Suspend Request message from the target SGSN, as shown in step 5b in FIG. 5, the MME stops running.
  • the suspending timer that is, the suspending timer is turned off, as shown in step 5c in FIG.
  • the second message may refer to the uplink signaling message sent by the UE, or the second message may refer to the pending request message.
  • the MME maintains the foregoing in the first time interval.
  • the PS service of the UE is in a suspended state, and specifically: the MME records a system time when the PS service of the UE is suspended; and keeps the duration within a set duration after the system time is recorded.
  • the PS service of the UE is in a suspended state.
  • the method may further include: Before the end of the time interval, the MME receives the second message, the second message may be the LTE network, or the second message may be a Suspend Request message, used to indicate the After the UE drops back to the 2G/3G network and initiates a PS suspension procedure to the target SGSN, the MME deletes the recorded system time according to the second message.
  • the MME deletes the recorded system time when receiving the uplink signaling message sent by the UE, or when receiving the target service GPRS support, when the uplink signaling message sent by the UE is received.
  • the MME deletes the recorded system time when the node SGSN sends a suspend request message.
  • the second message may also refer to the uplink signaling message sent by the UE, or the second message may refer to the pending request message.
  • the target SGSN provides an actual serving SGSN for the UE.
  • the MME can receive the suspension request message sent by the target SGSN, indicating that the UE has successfully accessed in the PS domain of the 2G/3G network, so the UE is already in the 2G/3G under normal conditions.
  • the CS domain of the network is successfully accessed, that is, the UE has successfully dropped back to the 2G/3G network.
  • Step 403 The MME restores the PS service of the suspended UE when the first time interval ends.
  • the MME when the MME ends the PS service of the suspended UE, the MME includes: when the MME ends at the first time interval. Clearing the suspended state of the context of the UE.
  • the MME restores the suspended PS service of the UE when the first time interval ends, including: the MME When the suspension timer expires, the suspended state of the context of the UE is cleared.
  • the MME recovers the suspended PS service of the UE when the first time interval ends, including: the MME is reaching When the set duration after the system time is recorded, the suspended state of the context of the UE is cleared.
  • the MME initiates a PS service recovery procedure for the UE, and clears that the UE is suspended.
  • the identification as shown in step 4 in Figure 5.
  • the MME is configured to monitor the UE, if the uplink signaling message sent by the UE is not received in the first time interval, or the target SGSN sends the When the request message is suspended, the MME restores the suspended PS service of the UE, and ensures that the subsequent PS service and the CS service are normally performed. And, if a message indicating that the UE has successfully accessed in 2G/3G is received, the PS service that is suspended by the UE is prohibited from being restored, and normal communication of the UE is guaranteed.
  • the operations are all performed by the MME, and the MME directly monitors the UE, and may directly suspend or resume the UE according to different situations.
  • the PS service does not need to instruct other devices to operate, and the processing process is relatively fast.
  • an embodiment of the present invention provides an MSC/VLR, where the MSC/VLR may include a learning module 601, a determining module 602, and a sending module 603.
  • the MSC/VLR in Embodiment 4 and the source MSC/VLR in Embodiments 1 to 3 are applicable. It is the same device.
  • the learning module 601 can be used to learn that the UE initiates a circuit switched fallback request from the E-UTRAN network.
  • the determining module 602 can be configured to determine that the circuit switched message sent by the UE is not received, the circuit switched message being a message sent by the UE from the dropped circuit switched domain after initiating the circuit switched fallback request.
  • the sending module 603 is configured to send the indication information to the MME, to indicate that the MME recovers the PS service of the suspended UE according to the indication information.
  • the learning module 601 is specifically configured to: receive an SGs interface message that is sent by the MME and includes the UE identity information.
  • the determining module 602 is specifically configured to:
  • the flag bit is used to indicate that the UE is not received after initiating the circuit switched fallback request a message sent from a falling circuit switched domain;
  • the MSC/VLR may further include a first operation module, configured to:
  • the first operation module can also be used to:
  • the system time of the record is deleted; or, within the set duration, if the MME sends the received
  • the SGs page rejects the message, deleting the system time of the record.
  • the SGs interface message is: an SGs service request message, or an SGs uplink circuit exchange fallback indication message.
  • the circuit switched message is a paging response message sent by the UE from the falling back circuit switched domain after initiating the downlink circuit switched fallback request or Location update message;
  • the circuit switched message is a service request message or a location update message sent by the UE from the dropped circuit switched domain after initiating the uplink circuit switch fallback request.
  • an embodiment of the present invention provides an MME, where the MME may include a first suspension module 701, a first receiving module 702, and a first recovery module 703.
  • the apparatus in the fifth embodiment and the MME in the first embodiment to the fourth embodiment may be the same device.
  • the first suspension module 701 can be configured to suspend PS services of the UE in a UE-initiated circuit switched fallback procedure.
  • the first receiving module 702 can be configured to receive the indication information sent by the source MSC/VLR.
  • the first recovery module 703 can be configured to recover the PS service of the suspended UE according to the indication information.
  • the first receiving module 702 is further configured to: in the circuit switching fallback process, receive indication information sent by the base station, where the indication information is used to indicate that the target cell in which the PS service is dropped in the circuit switch is unavailable.
  • the first suspension module 701 is specifically configured to: mark the context of the UE as a suspended state.
  • the first recovery module 703 is specifically configured to: clear the suspended state of the context of the UE.
  • an embodiment of the present invention provides an MME, where the MME may include a second suspension module 801, a holding module 802, and a second recovery module 803.
  • the MME and the MME in the first embodiment to the fifth embodiment may be the same device.
  • the second suspension module 801 can be configured to suspend the PS service of the UE in a UE-initiated circuit switched fallback procedure.
  • the hold module 802 can be configured to maintain the PS service of the UE in a suspended state for a first time interval.
  • the second recovery module 803 can be configured to restore the PS service of the suspended UE at the end of the first time interval.
  • the MME may further include: a second receiving module, configured to: in the circuit switching fallback process initiated by the UE, receive indication information sent by the base station, where the indication information is used to indicate that the PS service is in the The target cell in which the circuit switched back is dropped is not available.
  • a second receiving module configured to: in the circuit switching fallback process initiated by the UE, receive indication information sent by the base station, where the indication information is used to indicate that the PS service is in the The target cell in which the circuit switched back is dropped is not available.
  • the second suspension module 801 is specifically configured to: mark the context of the UE as a suspended state.
  • the holding module 802 is specifically configured to: when the PS service of the UE is suspended, start a suspension timer; and maintain the PS service of the UE in an operation interval of the suspension timer Suspended state.
  • the MME may further include: a second operation module, configured to: stop receiving the suspended timer when receiving the uplink signaling message sent by the UE; or, when receiving the target service When the GPRS support node SGSN sends a suspend request message, the suspend timer that is running is stopped.
  • a second operation module configured to: stop receiving the suspended timer when receiving the uplink signaling message sent by the UE; or, when receiving the target service When the GPRS support node SGSN sends a suspend request message, the suspend timer that is running is stopped.
  • the second recovery module 803 is specifically configured to: when the suspension timer expires, clear the suspended state of the context of the UE.
  • the holding module 802 is specifically configured to: when the PS service of the UE is suspended, record the system time; and keep the PS service of the UE in the set duration after the system time is recorded. State.
  • the second operation module is further configured to: receive an uplink message sent by the UE When the message is sent, the system time of the record is deleted; or, when the suspension request message sent by the target service GPRS support node SGSN is received, the system time of the record is deleted.
  • the second recovery module 803 is specifically configured to: when the set duration of the system time after the recording is reached, clear the suspended state of the context of the UE.
  • an embodiment of the present invention provides an MSC/VLR 900, the MSC/VLR 900, and the source MSC/VLR in Embodiment 1 to Embodiment 3, Embodiment 5, and Embodiment 6.
  • the MSC/VLR in the fourth embodiment may be the same device.
  • the MSC/VLR 900 includes a bus 940, and a first processor 910, a first memory 920, and a first interface 930 connected to the bus 940, wherein the first memory 920 is configured to store instructions, and the first interface 930 is configured to learn
  • the UE initiates a circuit-switched fallback request from the E-UTRAN network, and sends indication information to the MME, where the MME is instructed to restore the suspended PS service of the UE according to the indication information.
  • the first processor 910 is configured to execute the instruction to determine that the circuit-switched message sent by the UE is not received, and the circuit-switched message is sent by the UE from the circuit-switched domain that falls back after initiating the circuit-switched fallback request. Message.
  • the first interface 930 is specifically configured to: receive an SGs interface message that is sent by the MME and includes the UE identity information.
  • the first processor 910 is specifically configured to:
  • Executing the instruction after receiving the SGs interface message, starting the timer; when the timer expires, failing to receive the circuit switched domain from the UE after the circuit switchback request is initiated Message sent; or
  • Executing the instruction after receiving the SGs interface message, starting the timer; when the timer expires, setting a flag bit; the flag bit is used to indicate that the UE is not receiving the a message sent from a falling circuit switched domain after a circuit switched fallback request; or
  • the first processor 910 is further configured to: execute the instruction, stop receiving if the sending certification message sent by the target MSC/VLR is received before the timer expires. The timer is executed; or, the instruction is executed, and if the SGs paging reject message sent by the MME is received before the timer expires, the running timer is stopped.
  • the first processor 910 is further configured to: execute the instruction, if the sending certification message sent by the target MSC/VLR is received within the set duration, deleting the record The system time is executed; or, the instruction is executed, and if the SGs paging rejection message sent by the MME is received within the set duration, the recorded system time is deleted.
  • the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.
  • the circuit switched message is a circuit switched domain that is returned from the UE after the downlink circuit switchback request is initiated.
  • an embodiment of the present invention provides an MME 1000, where the MME 1000 and the MME in Embodiments 1 to 7 may be the same device.
  • the MME 1000 includes a bus 1040, and a second processor 1010, a second memory 1020, and a second interface 1030 connected to the bus 1040, wherein the second memory 1020 is for storing instructions.
  • the second processor 1010 is configured to perform the instruction to suspend the PS service of the UE in a circuit-switched fallback procedure initiated by the UE, and recover the PS service of the suspended UE according to the indication information.
  • the second interface 1030 is configured to receive the indication information sent by the source MSC/VLR.
  • the second interface 1030 is further configured to: in the process of the circuit switching fallback initiated by the UE, receive indication information sent by the base station, where the indication information is used to indicate that the PS service is in the The target cell that the circuit switched back down is not available.
  • the second processor 1010 is specifically configured to execute the instruction to mark the context of the UE as a suspended state.
  • the second processor 1010 is specifically configured to execute the instruction to clear the suspended state of the context of the UE.
  • an embodiment of the present invention provides an MME 1100, where the MME 1100 and the MME in the first embodiment to the eighth embodiment may be the same device.
  • the MME 1100 includes: a bus 1140, and a third processor 1110 and a third memory 1120 coupled to the bus 1140, wherein the third memory 1120 is configured to store instructions.
  • the third processor 1110 is configured to execute the instruction, suspending the PS service of the UE in a circuit-switched fallback procedure initiated by the UE, and maintaining the PS service of the UE in a suspended state in a first time interval. And at the end of the first time interval, restoring the suspended PS service of the UE.
  • the device may further include a third interface connected to the bus, configured to receive indication information sent by the base station in the circuit switching fallback process, where the indication information is used to indicate The PS service is unavailable in the target cell where the circuit switching is dropped.
  • a third interface connected to the bus, configured to receive indication information sent by the base station in the circuit switching fallback process, where the indication information is used to indicate The PS service is unavailable in the target cell where the circuit switching is dropped.
  • the third processor 1110 is further configured to execute the instruction to mark the context of the UE as a suspended state.
  • the third processor 1110 is further configured to: execute the instruction, when the PS service of the UE is suspended, start a suspend timer; In the operating interval of the device, the PS service of the UE is kept in a suspended state.
  • the third processor 1110 is further configured to: execute the instruction, when the uplink signaling message sent by the UE is received, stop the pending timer that is running. Or executing the instruction, when the suspension request message sent by the target serving GPRS support node SGSN is received, stopping the suspended timer that is running.
  • the third processor 1110 is further configured to: execute the instruction, and when the suspension timer expires, clear the suspended state of the context of the UE.
  • the third processor 1110 is further configured to: execute the instruction, When the PS service of the UE is suspended, the system time is recorded; and the PS service of the UE is kept in a suspended state within a set duration after the system time is recorded.
  • the third processor 1110 is further configured to: execute the instruction, when the uplink signaling message sent by the UE is received, delete the recorded system time; or Executing the instruction, when receiving the suspend request message sent by the target serving GPRS support node SGSN, deleting the recorded system time.
  • the third processor 1110 is further configured to: execute the instruction, and clear the context of the UE when the set duration of the system time after the recording is reached Suspended state.
  • the PS service recovery method in the embodiment of the present invention includes: the source mobile switching center/visit location register MSC/VLR learns that the user equipment UE initiates a circuit switching fallback request from the evolved universal mobile communication system terrestrial radio access network E-UTRAN network; Determining that the source MSC/VLR determines that the circuit switched message sent by the UE is not received, and the circuit switched message is a message sent by the UE from the circuit switched domain that is dropped after initiating the circuit switched fallback request; the source MSC The /VLR sends the indication information to the mobility management entity MME, and is used to instruct the MME to restore the suspended PS service of the UE according to the indication information.
  • the source MSC/VLR may instruct the MME to resume the suspended device.
  • the PS service of the UE is described to ensure the normal operation of the subsequent PS services. This also solves the technical problem in the prior art that the downlink PS service fails due to the UE being suspended.
  • the PS service recovery method in the embodiment of the present invention can be applied to each version of the UE, and is not limited in use, and has a wide application range.
  • the method for recovering the PS service provided by the present invention enables the UE, including the UE before the 3GPP protocol version 12, to fail to successfully fall back to the CS domain of the 2G/3G network and return to the E-UTRAN network, the MME can be timely Initiating the PS service recovery process to restore the hang state of the UE, and avoiding the problem that the network side can only resume the hang state of the UE after waiting for the uplink signaling message sent by the UE, and ensuring the uplink and downlink PS Smooth business and CS business, reducing data loss
  • the rate ensures the continuity of the uplink and downlink PS services and the cs service, and improves the user experience.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection between the various components shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present application in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • a processor to perform the embodiments of the present application. All or part of the steps of the method.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

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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 se rapporte au domaine technique des communications, et concerne particulièrement un procédé et un dispositif de récupération de service de commutation de paquets (PS), qui sont utilisés pour résoudre le problème technique dans l'état de la technique selon lequel un service PS de liaison descendante échoue en raison du fait qu'un équipement utilisateur (UE) est interrompu. Dans les modes de réalisation de la présente invention, lorsqu'un centre de commutation mobile (MSC)/enregistreur de localisation de visiteurs (VLR) source détermine qu'un message de commutation de circuit envoyé depuis d'un domaine de commutation de circuit de rétroaction après qu'un UE initie une requête de rétroaction de commutation de circuit (CSFB) n'a pas été reçu, une entité de gestion de mobilité (MME) est alertée pour récupérer un service PS de l'UE interrompu de façon à rétablir l'état interrompu de l'UE à temps, permettant ainsi de garantir que les services PS et les services CS de liaison montante et de liaison descendante fonctionnent bien, et d'améliorer l'expérience d'utilisateur.
PCT/CN2013/089246 2013-12-12 2013-12-12 Procédé de récupération de service de commutation de paquets (ps), centre de commutation mobile (msc)/enregistreur de localisation de visiteurs (vlr) et entité de gestion de mobilité (mme) WO2015085545A1 (fr)

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PCT/CN2013/089246 WO2015085545A1 (fr) 2013-12-12 2013-12-12 Procédé de récupération de service de commutation de paquets (ps), centre de commutation mobile (msc)/enregistreur de localisation de visiteurs (vlr) et entité de gestion de mobilité (mme)
CN201380002371.7A CN105027660B (zh) 2013-12-12 2013-12-12 一种ps业务恢复方法、msc/vlr及mme

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CN110324823B (zh) * 2019-07-04 2022-03-18 中国联合网络通信集团有限公司 一种csfb呼叫方法、系统
CN111818602B (zh) * 2020-07-13 2023-03-10 中国联合网络通信集团有限公司 一种csfb呼叫方法、移动管理实体、服务网关及系统
CN112235843A (zh) * 2020-11-02 2021-01-15 中国联合网络通信集团有限公司 数据业务处理方法、移动管理实体和服务网关

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