WO2015085545A1

WO2015085545A1 - Ps service recovery method, msc/vlr and mme

Info

Publication number: WO2015085545A1
Application number: PCT/CN2013/089246
Authority: WO
Inventors: 舒林; 吴晓波
Original assignee: 华为技术有限公司
Priority date: 2013-12-12
Filing date: 2013-12-12
Publication date: 2015-06-18
Also published as: CN105027660A; CN105027660B

Abstract

The present invention relates to the technical field of communications, and particularly to a packet switching (PS) service recovery method and device, which are used for solving the technical problem in the prior art that a downlink PS service fails due to the fact that a UE is suspended. In the embodiments of the present invention, when a source MSC/VLR determines that a circuit switching message sent from a fallback circuit switching domain after a UE initiates a circuit switching fallback (CSFB) request has not been received, an MME is indicated to recover a PS service of the suspended UE so as to recover the suspended state of the UE in time, thereby guaranteeing that the uplink and downlink PS services and CS services perform well, and improving the user experience.

Description

PS service recovery method, MSC/VLR and MME technical field

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.

Background technique

The Evolved Packet System (EPS) 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).

Based on the existing 2G/3G network mobile switching center / visit location register (Mobile Switching

Center/Visitors Location Register, MSC/VLR) and SGs (an interface) interface function between Mobility Management Entity (MME). 3GPP proposes "CS Fallback" (CSFB) technology and SGs. Short Message Service over SGs (SMS). 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.

Consider the following typical CSFB scenario:

(1) 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;

(3) If 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, PS service is unavailable in the target cell;

(4) The serving MME deactivates all Guaranteed Bit Rate (GBR) bearers, suspends all non-GBR bearers, and sets the UE context to a suspended state;

(5) 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.

(6) 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.

After 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. After 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.

These problems directly lead to the failure of the downlink PS service and the CS service, which cannot be solved in the prior art. Summary of the invention

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.

With reference to the first aspect, in a first possible implementation, 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.

With reference to the first aspect or the first possible implementation manner, in a second possible implementation, the source MSC/VLR determines that the circuit-switched message sent by the UE is not received, and includes:

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

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

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.

In combination with the second possible implementation manner, in a third possible implementation manner, 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.

With reference to the second possible implementation manner, in a fourth possible implementation manner, 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.

In combination with the first possible implementation manner or the second possible implementation manner, in the fifth possible implementation manner, the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

With reference to the first aspect, or any one of the first possible implementation to the fifth possible implementation, in a sixth possible implementation, if 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;

Receiving, by the MME, indication information sent by the source mobile switching center/visiting location register MSC/VLR;

The MME recovers the suspended PS service of the UE according to the indication information. With reference to the second aspect, in a first possible implementation manner, before the MME suspends the PS service of the UE in a circuit-switched fallback procedure initiated by the UE, 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.

With reference to the second aspect or the first possible implementation manner, in a second possible implementation, 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. In a third possible implementation, 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

Packet switching of the UE PS service hangs;

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

PS business.

With reference to the third aspect, in a first possible implementation manner, before the MME suspends the PS service of the UE in a UE-initiated circuit-switched fallback procedure, 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.

With reference to the third aspect or the first possible implementation manner, in a second possible implementation, 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. Or the first possible implementation manner or the second possible implementation manner, in a third possible implementation manner, the MME keeps the PS service of the UE in a suspended state in a first time interval, including:

When the MME suspends the PS service of the UE, the MME starts a suspend timer;

The PS service of the UE is kept in a suspended state during an operation period of the suspension timer. In conjunction with the third possible implementation manner, in a fourth possible implementation manner, in the running interval of the suspension 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

When receiving the suspend request message sent by the target serving GPRS support node SGSN, the MME stops the suspend timer that is running.

In combination with the third possible implementation manner or the fourth possible implementation manner, in a fifth possible implementation manner, 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.

With reference to the third aspect, or any one of the first possible implementation manners and the second possible implementation manner, in a sixth possible implementation manner, 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.

With reference to the sixth possible implementation manner, in the seventh possible implementation manner, after the setting duration of the system time is recorded, the method further includes:

When receiving the uplink signaling message sent by the UE, the MME deletes the recorded system time; or

When receiving the suspend request message sent by the target service GPRS support node SGSN, the MME deletes the recorded system time.

In combination with the sixth possible implementation manner or the seventh possible implementation manner, in an eighth possible implementation manner, 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.

According to a fourth aspect of the present invention, a mobile switching center/visiting location register MSC/VLR is provided, 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;

And 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.

With reference to the fourth aspect, in a first possible implementation, 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.

With reference to the fourth aspect or the first possible implementation manner, in a second possible implementation manner, the determining module is specifically configured to:

After receiving the SGs interface message, starting a timer; when the timer expires, failing to receive a message sent by the UE from the circuit switched domain that is dropped after initiating the circuit switched fallback request; or

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 received after initiating the circuit switched fallback request a message sent from a falling circuit switched domain; or

After receiving the SGs interface message, recording the system time; after receiving the system time after the system time is recorded, the UE is not received from the circuit switched domain that has been dropped after initiating the circuit switched fallback request. Message.

In conjunction with the second possible implementation, in a third possible implementation, 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.

In conjunction with the second possible implementation, in a fourth possible implementation, 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. In combination with the first possible implementation manner or the second possible implementation manner, in the fifth possible implementation manner, the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

With reference to the third aspect, or any one of the first possible implementation to the fifth possible implementation, in a sixth possible implementation, if 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; or

And if the circuit switched fallback request is an uplink circuit switched 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;

And a first recovery module, configured to recover, according to the indication information, the PS service of the suspended UE.

With reference to the fifth aspect, in a first possible implementation manner, 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.

With reference to the fifth aspect or the first possible implementation manner, in a second possible implementation manner, the first suspension module is specifically configured to: mark a context of the UE as a suspended state.

With reference to the implementation of the fifth aspect or the first possible or the second possible implementation manner, in a third possible implementation, the first recovery module is specifically configured to: clear the context of the UE Suspended state. A sixth aspect of the present invention provides a mobility management entity MME, including:

a second suspension module, configured to be used in a circuit switched fallback process initiated by the user equipment UE

Packet switching of the UE PS service hangs;

a maintaining module, configured to keep the PS service of the UE in a suspended state in a first time interval, and a second recovery module, configured to restore the suspended UE when the first time interval ends PS business.

With reference to the sixth aspect, in a first possible implementation manner, 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.

With reference to the sixth aspect or the first possible implementation manner, in a second possible implementation manner, the second suspension module is specifically configured to: mark a context of the UE as a suspended state.

With reference to the sixth aspect, the first possible implementation manner, or the second possible implementation manner, in a third possible implementation manner, 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.

With reference to the third possible implementation manner, in a fourth possible implementation manner, 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.

In combination with the third possible implementation manner or the fourth possible implementation manner, in a fifth possible implementation manner, the second recovery module is specifically configured to: when the suspension timer expires, clear the The suspended state of the context of the UE.

With reference to the third aspect, the first possible implementation manner, or the second possible implementation manner, in the sixth possible implementation manner, 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.

With reference to the sixth possible implementation manner, in a seventh possible implementation manner, 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.

With reference to the sixth possible implementation manner or the seventh possible implementation manner, in the eighth possible implementation manner, 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.

According to a seventh aspect of the present invention, a mobile switching center/visiting location register MSC/VLR is provided, 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.

With reference to the seventh aspect, in a first possible implementation manner, 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.

With reference to the seventh aspect or the first possible implementation manner, in a second possible implementation, 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.

In conjunction with the second possible implementation, in a third possible implementation, 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.

In conjunction with the second possible implementation, in a fourth possible implementation, 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.

In combination with the second possible implementation manner or the third possible implementation manner, in the fifth possible implementation manner, the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

With reference to the seventh aspect, or any one of the first possible implementation manners to the fifth possible implementation manner, in a sixth possible implementation manner, if 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.

With reference to the eighth aspect, in a first possible implementation, 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.

With reference to the eighth aspect or the first possible implementation manner, in a second possible implementation manner, the second processor is specifically configured to: execute the instruction to mark the context of the UE as a suspended state.

With reference to the eighth aspect, the first possible implementation, or the second possible implementation, in a third possible implementation, the second processor is specifically configured to: execute the instruction to clear the

The suspended state of the context of the UE.

In a ninth aspect of the present invention, a mobility management entity is provided, 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.

With reference to the ninth aspect, in a first possible implementation, 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.

In conjunction with the ninth aspect or the first possible implementation, in a second possible implementation, the third processor is further configured to: execute the instruction to mark a context of the UE as a suspended state.

In conjunction with the ninth aspect, the first possible implementation, or the second possible implementation, in a third possible implementation, 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.

In combination with the third possible implementation manner, in the fourth possible implementation manner, 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.

In combination with the third possible implementation manner or the fourth possible implementation manner, in a fifth possible implementation manner, 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.

In conjunction with the ninth aspect, the first possible implementation, or the second possible implementation, in a sixth possible implementation, 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.

With reference to the sixth possible implementation, in a seventh possible implementation, 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.

In conjunction with the sixth possible implementation or the seventh possible implementation, in an eighth possible implementation, 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.

In the embodiment of the present invention, after the source MSC/VLR learns the circuit switch fallback request, if it is determined that the circuit switched message sent by the UE is not received, 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. Moreover, 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. DRAWINGS

FIG. 1 is a main flowchart of a PS service recovery method according to an embodiment of the present invention;

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;

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.

In the embodiment of the present invention, after the source MSC/VLR learns the circuit switch fallback request, if it is determined that the circuit switched message sent by the UE is not received, 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. Moreover, 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 technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. based on All other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present invention.

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. The LTE system described herein is an Evolved Universal Mobile Telecommunications System Territorial Radio Access Network (E-UTRAN).

Various aspects are described herein in connection with user side devices and/or network side devices.

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) communicates with one or more core networks, which 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. For example, personal communication service (PCS), cordless telephone, session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (PDA), personal digital assistant (PDA), etc. . 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). For convenience of description, 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) 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. The base station can also coordinate attribute management of the air interface. For example, 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.

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. In the embodiment of the present invention, 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. In the embodiment of the present invention, 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.

Additionally, the terms "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. In addition, the character "/" in this article generally means that the contextual object is an "or" relationship.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

Embodiment 1

Referring to FIG. 1, 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.

In general, the interaction flowchart of the PS service recovery method in the embodiment of the present invention is shown in FIG. 2 . Preferably, in the CSFB and SMS over SGs mechanisms, 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. 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.

Therefore, in the embodiment of the present invention, before the step 101, that is, before the step la in FIG. 2, 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.

1. 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. After receiving the extended service request message, 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 . It should be noted that, in this case, 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.

Second, the MT-CSFB process initiated by the network side is shown in the part of the solid line frame 2 in Figure 2.

The UE has successfully jointly registered to the MME and the source MSC/VLR. After receiving the downlink CS service request, the source MSC/VLR sends an SGs paging request to the MME, as shown in step 2a in FIG. After receiving the paging request of the SGs, 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.

That is, 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.

In the embodiment of the present invention, 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. Preferably, 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. a timer; when the timer expires, setting a flag bit, the flag bit is used to indicate that the message sent by the UE from the circuit switched domain that has been dropped after initiating the circuit switched fallback request is not received; or 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.

For example, 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. Wherein, 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.

Wherein, if 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.

If 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.

Preferably, in the embodiment of the present invention, 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.

Specifically, in the embodiment of the present invention, 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. 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.

In this case, 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.

Preferably, in the embodiment of the present invention, after the source MSC/VLR starts the timer, 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.

Specifically, after the timer is started, and before the timer does not time out, if 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.

Preferably, in the embodiment of the present invention, 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 For indicating that the user refuses to accept the CSFB process, the source MSC/VLR deletes the record according to the first message, that is, deletes the recorded system time.

It should be noted that, after the UE falls back to the 2G/3G network, 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.

Similarly, if 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.

Specifically, 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.

When 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. In the process, 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 PS service recovery process, and clearing the identifier that the UE is suspended, as shown in step 7 in FIG.

That is, if the timer expires, or the source MSC/VLR deletes the record, then 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.

It should be noted that, if the UE replaces the serving MSC/VLR in the process of falling back to 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.

If the MME receives the indication information, 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.

In the embodiment of the present invention, 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.

Specifically, in the embodiment of the present invention, before the MME suspends the PS service of the UE in the circuit-switched fallback process 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.

Specifically, in the embodiment of the present invention, 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. 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.

Specifically, in the embodiment of the present invention, 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.

At this time, 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.

When 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. In the process, 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.

Specifically, in the embodiment of the present invention, 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.

And 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 .

Embodiment 3

Referring to FIG. 4, based on the same inventive concept, 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.

In general, the interaction flowchart of the PS service recovery method in the embodiment of the present invention is as shown in FIG. 5.

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.

1. 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. After receiving the extended service request message, 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, In this case, the SGs interface message may specifically refer to the SGs uplink circuit switching fallback indication message, as shown in step lb in FIG. It should be noted that, in this case, 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.

Second, the MT-CSFB process initiated by the network side is shown in the part of the solid line frame 2 in Figure 5.

The UE has successfully jointly registered to the MME and the source MSC/VLR. After receiving the downlink CS service request, the source MSC/VLR sends an SGs paging request to the MME, as shown in step 2a in FIG. After receiving the paging request of the SGs, 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.

Specifically, in the embodiment of the present invention, 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. 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. Specifically, in the embodiment of the present invention, the 挂 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.

At this time, the 发起 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.

Preferably, in the embodiment of the present invention, 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 .

Preferably, in the embodiment of the present invention, after the suspending timer is started, and before the suspending timer expires, that is, in the running interval of the suspending timer, 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.

Specifically, in the running interval of the suspension timer, 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.

Specifically, before the timer expires, if 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.

In the embodiment of the present invention, 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.

Preferably, in the embodiment of the present invention, 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.

Preferably, in the embodiment of the present invention, in the set duration after the recording of the system time, that is, when the last time endpoint value of the first time interval has not arrived, 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.

Specifically, 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. When the node SGSN sends a suspend request message, the MME deletes the recorded system time.

In the embodiment of the present invention, 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.

It should be noted that, after the UE falls back to the 2G/3G network, 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. Specifically, in the embodiment of the present invention, 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.

Preferably, if the MME starts the suspension timer, 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.

Preferably, if the MME records the system time, 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.

Preferably, if the MME starts the suspension timer, when the suspension timer expires, 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.

In the embodiment of the present invention, 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.

Suspending or restoring the PS service of the UE, 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.

Embodiment 4

Referring to FIG. 6, based on the same inventive concept, 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. Preferably, 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.

Preferably, 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.

Preferably, the determining module 602 is specifically configured to:

After receiving the SGs interface message, starting the timer; when the timer expires, failing to receive a message sent by the UE from the circuit switched domain that is dropped after initiating the circuit switch fallback request; or

Preferably, the MSC/VLR may further include a first operation module, configured to:

Before receiving the sending of the certificate message sent by the target MSC/VLR, stopping the running timer; or, if the timer expires, receiving the SGs sent by the MME Calling the reject message, stopping the running timer.

The first operation module can also be used to:

If the sending certification message sent by the target MSC/VLR is received, 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.

Preferably, the SGs interface message is: an SGs service request message, or an SGs uplink circuit exchange fallback indication message.

Preferably, if the circuit switched fallback request is a downlink circuit switched fallback request, 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; or

Embodiment 5

Referring to FIG. 7, based on the same inventive concept, 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. Preferably, 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.

Preferably, 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.

Preferably, the first suspension module 701 is specifically configured to: mark the context of the UE as a suspended state.

Preferably, the first recovery module 703 is specifically configured to: clear the suspended state of the context of the UE.

Embodiment 6 Referring to FIG. 8, 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. Preferably, 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.

Preferably, 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.

Preferably, the second suspension module 801 is specifically configured to: mark the context of the UE as a suspended state.

Preferably, 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.

Preferably, 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.

Preferably, the second recovery module 803 is specifically configured to: when the suspension timer expires, clear the suspended state of the context of the UE.

Preferably, 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.

Preferably, 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.

Preferably, 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.

Example 7

Referring to FIG. 9, based on the same inventive concept, 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.

In the embodiment of the present invention, 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.

In the embodiment of the present invention, 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, recording a system time; after receiving the system time after the system time is recorded, failing to receive the UE from the fallback after initiating the circuit switch fallback request Messages sent by the circuit switched domain. In the embodiment of the present invention, 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.

In the embodiment of the present invention, 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.

In the embodiment of the present invention, optionally, the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

In the embodiment of the present invention, optionally, if the circuit switch fallback request is a downlink circuit switch fallback request, the circuit switched message is a circuit switched domain that is returned from the UE after the downlink circuit switchback request is initiated. The sent paging response message or the location update message; or, if the circuit switched fallback request is an uplink circuit switched fallback request, the circuit switched message is a circuit that the UE drops back after initiating the uplink circuit switching fallback request A service request message or a location update message sent by the switching domain.

Example eight

Referring to FIG. 10, based on the same inventive concept, 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.

In the embodiment of the present invention, 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. In the embodiment of the present invention, the second processor 1010 is specifically configured to execute the instruction to mark the context of the UE as a suspended state.

In the embodiment of the present invention, the second processor 1010 is specifically configured to execute the instruction to clear the suspended state of the context of the UE.

Example nine

Referring to FIG. 11 , based on the same inventive concept, 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.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, the third processor 1110 is further configured to execute the instruction to mark the context of the UE as a suspended state.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, 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.

Optionally, in the embodiment of the present invention, 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 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. It can be clearly understood by those skilled in the art that for the convenience and cleanness of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the system, the device and the unit described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, 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. Alternatively, 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.

In addition, 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. Based on such understanding, 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. Including a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or 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. .

The above embodiments are only used to describe the technical solutions of the present application in detail, but the description of the above embodiments is only for helping to understand the method and the core idea of the present invention, and should not be construed as limiting the present invention. Those skilled in the art will be able to devise variations or alternatives that are conceivable within the scope of the present invention.

Claims

Rights request

1. A packet switching PS service recovery method, characterized by including:

The source mobile switching center/visited location register MSC/VLR learns that the user equipment UE initiates a circuit-switched fallback request from the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN network; the source MSC/VLR determines that the UE has not been received The circuit-switched message sent, the circuit-switched message is a message sent by the UE from the circuit-switched domain of the fallback after initiating the circuit-switched fallback request;

The source MSC/VLR sends indication information to the mobility management entity MME, which is used to instruct the MME to resume the suspended PS service of the UE according to the indication information.

2. The method of claim 1, wherein the source MSC/VLR learns that the UE initiates a circuit-switched fallback request from the E-UTRAN network, including: the source MSC/VLR receives a message sent by the MME containing the SGs interface message describing UE identity information.

3. The method of claim 1 or 2, wherein the source MSC/VLR determines that the circuit-switched message sent by the UE has not been received, including:

After receiving the SGs interface message, the source MSC/VLR starts a timer; when the timer times out, the source MSC/VLR does not receive the circuit-switched fallback request sent by the UE from the fallback circuit-switched domain after initiating the circuit-switched fallback request. news; or

After receiving the SGs interface message, the source MSC/VLR starts the timer; when the timer times out, sets a flag bit; the flag bit is used to indicate that the UE has not received the message initiated by the UE. A message sent from the circuit-switched domain that fell back following the circuit-switched fallback request described above; or

After receiving the SGs interface message, the source MSC/VLR records the system time; within the set time period after the recorded system time, the source MSC/VLR does not receive the message from the UE after initiating the circuit-switched fallback request. Fallback messages sent by the circuit-switched domain.

4. The method of claim 3, further comprising:

Before the timer times out, if the source MSC/VLR receives the delivery certificate message sent by the target MSC/VLR, stop the running timer; or, before the timer times out, Before, if the source MSC/VLR receives the SGs paging rejection message sent by the MME, it stops the running timer.

5. The method of claim 3, further comprising:

Within the set time period, if the source MSC/VLR receives the delivery certification message sent by the target MSC/VLR, delete the recorded system time; or

Within the set time period, if the source MSC/VLR receives the SGs paging rejection message sent by the MME, delete the recorded system time.

6. The method according to claim 2 or 3, characterized in that the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

7. The method according to any one of claims 1 to 6, characterized in that:

If the circuit-switched fallback request is a downlink circuit-switched fallback request, the circuit-switched message is a paging response message or a location update message sent by the UE from the circuit-switched domain that fell back after initiating the downlink circuit-switched fallback request; or

If the circuit-switched fallback request is an uplink circuit-switched fallback request, the circuit-switched message is a service request message or a location update message sent by the UE from the circuit-switched domain that falls back after initiating the uplink circuit-switched fallback request.

8. A packet switching PS service recovery method, characterized by including:

The mobility management entity MME suspends the PS service of the user equipment UE in the circuit-switched fallback process initiated by the user equipment UE;

The MME receives the indication information sent by the source mobile switching center/visited location register MSC/VLR;

The MME resumes the suspended PS service of the UE according to the indication information.

9. The method according to claim 8, characterized in that, before the MME suspends the PS service of the UE in the circuit-switched fallback process initiated by the UE, it further includes: the MME initiates by the UE In the circuit-switched fallback process, indication information sent by the base station is received, and the indication information is used to indicate that the PS service is not available in the target cell of the circuit-switched fallback.

10. The method according to claim 8 or 9, characterized in that, the MME Suspending the PS service of the UE in the circuit-switched fallback process initiated by the UE includes: the MME marking the context of the UE as a suspended state.

11. The method according to any one of claims 8 to 10, characterized in that, the MME resumes the suspended PS service of the UE according to the indication information, including: the MME clears all The suspend state of the context of the UE.

12. A packet switching PS service recovery method, characterized by including:

The mobility management entity MME will describe the above in the circuit switched fallback process initiated by the user equipment UE.

The UE's packet switching PS service is suspended;

The MME keeps the PS service of the UE in a suspended state during the first time interval; and the MME resumes the suspended PS service of the UE at the end of the first time interval.

PS business.

13. The method of claim 12, characterized in that, before the MME suspends the PS service of the UE in the circuit-switched fallback process initiated by the UE, further comprising: the MME suspending the PS service of the UE in the circuit-switched fallback process. In the fallback process, the instruction information sent by the base station is received, and the instruction information is used to indicate that the PS service is not available in the target cell of the circuit-switched fallback.

14. The method of claim 12 or 13, wherein the MME suspends the PS service of the UE in the circuit-switched fallback process initiated by the UE, including: the MME suspends the context of the UE. Marked as pending.

15. The method according to any one of claims 12 to 14, wherein the MME keeps the PS service of the UE in a suspended state during the first time interval, including:

When the MME suspends the PS service of the UE, it starts a suspension timer;

Within the running interval of the suspension timer, the PS service of the UE is kept in a suspended state.

16. The method according to claim 15, characterized in that, within the running interval of the suspension timer, it further includes:

When receiving the uplink signaling message sent by the UE, the MME stops the running suspension timer; or

When receiving the suspend request message sent by the target service GPRS support node SGSN, the The MME stops the running suspend timer.

17. The method according to claim 15 or 16, wherein the MME resumes the suspended PS service of the UE at the end of the first time interval, including: the MME resumes the suspended PS service of the UE at the end of the first time interval. When the suspension timer times out, the suspension state of the context of the UE is cleared.

18. The method according to any one of claims 12 to 14, wherein the MME keeps the PS service of the UE in a suspended state during the first time interval, including:

The MME records the system time when suspending the PS service of the UE;

Within a set time period after recording the system time, the PS service of the UE is kept in a suspended state.

19. The method of claim 18, wherein within a set time period after recording the system time, it further includes:

20. The method according to claim 18 or 19, characterized in that, at the end of the first time interval, the MME resumes the suspended PS service of the UE, including: the MME When the set time period after the recorded system time is reached, the suspend state of the context of the UE is cleared.

21. A mobile switching center/visited location register MSC/VLR, characterized by including: a learning module for learning that the user equipment UE initiates circuit-switched fallback from the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN network ask;

Determining module, configured to determine that a circuit-switched message sent by the UE has not been received, where the circuit-switched message is a message sent by the UE from the circuit-switched domain that fell back after initiating the circuit-switched fallback request;

A sending module, configured to send indication information to the mobility management entity MME, for instructing the MME to resume the suspended packet-switched PS service of the UE according to the indication information.

22. The MSC/VLR according to claim 21, wherein the learning module is specifically configured to: receive an SGs interface message containing the UE identity information sent by the MME.

23. The MSC/VLR according to claim 21 or 22, characterized in that the determination module is specifically used for:

After receiving the SGs interface message, start the timer; when the timer times out, the message sent by the UE from the fallback circuit-switched domain after initiating the circuit-switched fallback request is not received; or

After receiving the SGs interface message, start the timer; when the timer times out, set a flag bit; the flag bit is used to indicate that the UE has not received the circuit-switched fallback request after initiating the circuit-switched fallback request. Messages sent from the fallback circuit-switched domain; or

After receiving the SGs interface message, record the system time; within the set time period after recording the system time, the UE does not receive the UE from the circuit switched domain that fell back after initiating the circuit switched fallback request. information.

24. The MSC/VLR according to claim 23, wherein the device further includes a first operation module, configured to: before the timer times out, if a transmission proof message sent by the target MSC/VLR is received , stop the running timer; or, before the timer times out, if the SGs paging reject message sent by the MME is received, stop the running timer.

25. The MSC/VLR according to claim 23, wherein the device further includes a first operation module, configured to: within the set time period, if a transmission certification message sent by the target MSC/VLR is received , delete the recorded system time; or, within the set time period, if the SGs paging rejection message sent by the MME is received, delete the recorded system time.

26. The MSC/VLR according to claim 22 or 23, wherein the SGs interface message is: an SGs service request message, or an SGs uplink circuit switching fallback indication message.

27. The MSC/VLR according to any one of claims 21 to 26, characterized in that: if the circuit-switched fallback request is a downlink circuit-switched fallback request, the circuit-switched message is the UE initiating the A paging response message or location update message sent from the circuit-switched domain that fell back after a downlink circuit-switched fallback request; or If the circuit-switched fallback request is an uplink circuit-switched fallback request, the circuit-switched message is a service request message or a location update message sent by the UE from the circuit-switched domain that falls back after initiating the uplink circuit-switched fallback request.

28. A mobility management entity MME, characterized by: including:

The first suspension module is configured to suspend the said circuit switching fallback process initiated by the user equipment UE.

The UE's packet switching PS service is suspended;

The first receiving module is used to receive the indication information sent by the source mobile switching center/visited location register MSC/VLR;

The first recovery module is configured to resume the suspended PS service of the UE according to the indication information.

29. The MME according to claim 28, wherein the first receiving module is further configured to: receive indication information sent by the base station in the circuit switched fallback process initiated by the UE, the indication information Used to indicate that the PS service is unavailable in the target cell of the circuit-switched fallback.

30. The MME according to claim 28 or 29, wherein the first suspension module is specifically configured to: mark the context of the UE as a suspension state.

31. The MME according to any one of claims 28 to 30, wherein the first recovery module is specifically configured to: clear the suspend state of the context of the UE.

32. A mobility management entity MME, characterized by: including:

The second suspension module is used to suspend the packet switching PS service of the user equipment UE during the circuit switching fallback process initiated by the user equipment UE;

A holding module, configured to keep the PS service of the UE in a suspended state during the first time interval; a second recovery module, used to resume the suspended UE at the end of the first time interval. PS business.

33. The MME according to claim 32, wherein the device further includes a second receiving module, configured to: receive indication information sent by the base station during the circuit switching fallback process, and the indication information is used to: Indicates that the PS service is unavailable in the target cell of the circuit switched fallback.

34. The MME according to claim 32 or 33, characterized in that, the second suspend module Specifically used to: mark the context of the UE as a suspended state.

35. The MME according to any one of claims 32 to 34, wherein the holding module is specifically configured to: start a suspension timer when suspending the PS service of the UE; Within the running interval of the suspend timer, the PS service of the UE is kept in the suspended state.

36. The MME according to claim 35, characterized in that, the MME further includes a second operation module, configured to: when receiving the uplink signaling message sent by the UE, stop the running suspension timer; or, when receiving a suspend request message sent by the target service GPRS support node SGSN, stop the running suspend timer.

37. The MME according to claim 35 or 36, characterized in that the second recovery module is specifically configured to clear the suspension state of the context of the UE when the suspension timer times out.

38. The MME according to any one of claims 32 to 34, wherein the holding module is specifically used to: record the system time when suspending the PS service of the UE; and record the system time when the PS service of the UE is suspended. Within the set time period after the time, the PS service of the UE is kept in the suspended state.

39. The MME according to claim 38, characterized in that, the MME further includes a second operation module, configured to: when receiving the uplink signaling message sent by the UE, delete the recorded system time; Or, when receiving the suspend request message sent by the target service GPRS support node SGSN, delete the recorded system time.

40. The MME according to claim 38 or 39, wherein the second recovery module is specifically configured to: clear all the context of the UE when a set time period after the recorded system time is reached. Describes the pending status.