WO2018095015A1

WO2018095015A1 - Circuit switched fallback method, base station, mobility management entity and terminal

Info

Publication number: WO2018095015A1
Application number: PCT/CN2017/087571
Authority: WO
Inventors: 何岳; 金辉; 杨皓睿; 欧阳国威
Original assignee: 华为技术有限公司
Priority date: 2016-11-25
Filing date: 2017-06-08
Publication date: 2018-05-31
Also published as: CN108464038A; CN108464038B

Abstract

Provided in the embodiments of the present invention are a circuit switched fallback method, base station, mobility management entity and terminal. The method comprises: a base station receiving a first message sent by a mobility management entity, the first message being used for indicating that a first terminal of a base station requires circuit switched fallback. The base station determines a connection technology between the first terminal and a second terminal, the base station sending a second message to the first terminal according to the connection technology, wherein the second message is used for indicating a means of circuit switched fallback of the first terminal. In the embodiments of the present invention, when the base station determines, by means of indirect access technology indication information, that the first terminal and the second terminal use a non-Third-Generation Partnership Project (3GPP) technology to connect, the base station will not release a Radio Resource Control (RRC) connection of the same and the first terminal such that the first terminal may perform a circuit switched (CS) service while at the same time performing a packet switch (PS) service by means of the connection with the second terminal. When the base station determines that the first terminal and the second terminal use a 3GPP technology to connect, the base station causes the second terminal to reserve RRC context information such that the PS service may be performed quickly after the CS service ends.

Description

Circuit domain fallback method, base station, mobile management entity and terminal

This application claims the priority of the Chinese Patent Application filed on November 25, 2016, the Patent Office of the State Intellectual Property Office of China, the application number is 201611064469.7, and the invention name is “a method of circuit domain fallback”, the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a circuit domain fallback method, a base station, a mobility management entity, and a terminal.

Background technique

Wearable device (WD) is increasingly favored for its advantages of intelligence, portability, and aesthetics. Currently, the industry has introduced a watch that can be installed with a Subscriber Identification Module (SIM) card that can be connected directly to the network and for voice calls without the need to connect to a mobile phone. WD's direct connection to the network and support for voice calls are a future trend. However, since the WD is limited in size, its battery capacity is small, and if it communicates directly with the base station network, the battery consumption is fast and the standby time is short. Moreover, WD usually has a special shape and is difficult to design an antenna. At present, only a single antenna can be realized. When transmitting the same amount of data, it takes more time and consumes a lot of network resources than a multi-antenna device. Therefore, WD is usually connected to the network through a terminal to save power, increase the number of network connections, and improve transmission efficiency. The terminal includes a device such as a mobile phone that can perform packet switching (PS) services.

Currently, the types of voice calls include Voice over Long Term Evolution (VoLTE) and Circuit Switched (CS) voice services. WD usually only supports CS voice services or supports both VoLTE voice services and CS voice services. When the WD and its network support the VoLTE voice service, after the WD is connected to the terminal, the VoLTE voice service can be implemented through a relay link with the terminal. However, when the network where the WD and/or the WD are located does not support the VoLTE voice service, the prior art does not solve the problem of using the WD connected to the terminal to perform the CS voice service problem.

Summary of the invention

The embodiment of the invention provides a method for circuit domain fallback, a base station, a mobility management entity and a terminal, so as to solve the problem that the first terminal connected to the second terminal cannot make a voice call.

In a first aspect, an embodiment of the present invention provides a method for circuit domain fallback. The method includes: receiving, by the base station, a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs to return the circuit domain. The base station determines a connection technology between the first terminal and the second terminal, and the base station sends a second message to the first terminal according to the connection technology, where the second message is used to indicate the manner in which the circuit circuit of the first terminal falls back.

A method for circuit domain fallback is provided by the embodiment of the present invention. After the base station receives a message indicating that the first terminal needs the circuit domain to fall back from the mobility management entity, the base station determines a connection technology between the first terminal pole and the second terminal. And sending a second message to the first terminal according to the connection technology to indicate a manner in which the first terminal circuit domain falls back. The problem that the first terminal connected to the second terminal cannot make a voice call in the prior art is solved.

In a possible implementation manner, the base station determines a connection technology between the first terminal and the second terminal, where the base station determines, according to context information of the first terminal, a connection technology between the first terminal and the second terminal; or The base station receives the first indication information sent by the mobility management entity, and the base station determines the connection technology between the first terminal and the second terminal according to the first indication information; or the base station receives the second indication information sent by the first terminal, and the base station according to the second The indication information determines a connection technique between the first terminal and the second terminal. By adopting this implementation manner, the base station can determine the connection technology between the first terminal and the second terminal, and further determine the content of the second message used to indicate the first terminal circuit domain fallback mode.

In a possible implementation, the base station sends a second message to the first terminal according to the connection technology, where the second message is used to indicate the manner in which the first terminal circuit domain falls back, including: if the connection technology is a non-third generation partnership program The non-3GPP technology, the second message indicates that the first terminal reserves the radio resource control RRC connection with the base station when the circuit domain falls back; or, if the connection technology is the 3GPP technology, the second message indicates that the first terminal falls back in the circuit domain Suspend the RRC connection with the base station. By adopting the implementation manner, when the base station determines, by using the indirect access technology indication information, that the first terminal and the second terminal are connected by using the non-3GPP technology, the base station will not release the RRC connection with the first terminal, but send the first terminal to the first terminal. The RRC connection reconfiguration message enables the first terminal to fall back to the circuit domain to perform the CS service according to the information of the 2G or 3G cell included in the message, and also perform the PS service through the connection with the second terminal. When the base station determines, by using the indirect access technology indication information, that the first terminal and the second terminal are connected by using the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can be based on the 2G or 3G cell included in the message. The information falls back to the circuit domain for CS services. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

In a possible implementation manner, if the connection technology is a non-3GPP technology, the method further includes: if the inactivity timer of the second terminal expires, the base station does not release the RRC connection of the second terminal. In this implementation manner, the base station does not start the inactivity timer when the second terminal does not perform the data receiving and sending services, and the second terminal cannot enter the idle state, so that the first terminal can quickly access after ending the CS voice service. The second terminal performs the PS service, which saves the time and signaling consumption of the terminal entering the connected state from the idle state.

In a second aspect, an embodiment of the present invention provides a method for circuit domain fallback. The method includes: the mobility management entity receives the first message sent by the first terminal, where the first message is used to indicate that the first terminal needs to return the circuit domain. The mobility management entity sends a second message to the base station, where the second message is used to indicate that the first terminal of the base station needs to return the circuit domain.

In a possible implementation manner, the first message includes a connection technology between the first terminal and the second terminal.

In a possible implementation manner, the second message includes a connection technology between the first terminal and the second terminal.

In a third aspect, an embodiment of the present invention provides a method for circuit domain fallback. The method includes: the first terminal sends a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to return the circuit domain. The first terminal receives the second message sent by the base station, and the second message is used to indicate the manner in which the circuit path of the first terminal falls back. The first terminal performs circuit domain fallback according to the second message.

In a possible implementation, the first terminal performs circuit domain fallback according to the second message, including: The terminal reserves the radio resource control RRC connection with the base station when the circuit domain falls back; or the first terminal suspends the RRC connection with the base station when the circuit domain falls back.

In a fourth aspect, the embodiment of the present invention provides a base station, where the base station can implement the functions performed by the base station in the application authorization method of the foregoing first aspect, and the functions can be implemented by using hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the base station includes a receiving module, a transmitting module, and a processing module. The receiving module is configured to receive a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs to return the circuit domain. The processing module is configured to determine a connection technology between the first terminal and the second terminal. The sending module is configured to send a second message to the first terminal according to the connection technology, where the second message is used to indicate a manner in which the circuit path of the first terminal falls back.

In a possible design, the processing module is further configured to: determine a connection technology between the first terminal and the second terminal according to the context information of the first terminal; or, after the receiving module receives the first indication information sent by the mobility management entity, Determining, according to the first indication information, a connection technology between the first terminal and the second terminal; or, after the receiving module receives the second indication information sent by the first terminal, determining, by the second indication information, the first terminal and the second terminal The connection between the technology.

In a possible design, the sending module is further configured to: after the processing module determines that the connection technology is a non-3rd generation partner plan non-3GPP technology, send a second message to the first terminal according to the connection technology, where the second message indicates A terminal reserves a radio resource control RRC connection with the base station when the circuit domain falls back; or, after the processing module determines that the connection technology is the 3GPP technology, sends a second message to the first terminal according to the connection technology, where the second message indicates the first The terminal suspends an RRC connection with the base station when the circuit domain falls back.

In a possible design, the processing module is further configured to: after determining that the connection technology is a non-3GPP technology, if the inactivity timer of the second terminal times out, the RRC connection of the second terminal is not released.

In a fifth aspect, the embodiment of the present invention provides a mobility management entity, where the mobility management entity can implement the functions performed by the mobility management entity in the application authorization method of the foregoing aspect, and the functions may be implemented by hardware or by hardware. The corresponding software implementation. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the mobility management entity includes a receiving module and a transmitting module. The receiving module is configured to receive a first message sent by the first terminal, where the first message is used to indicate that the first terminal needs to return the circuit domain. The sending module is configured to send a second message to the base station, where the second message is used to indicate that the first terminal of the base station needs to return the circuit domain.

In one possible design, the first message includes a connection technique between the first terminal and the second terminal.

In one possible design, the second message includes a connection technique between the first terminal and the second terminal.

In a sixth aspect, the embodiment of the present invention provides a terminal, where the terminal can implement the function performed by the terminal in the application authorization method of the first aspect, and the function can be implemented by using hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the terminal includes a receiving module, a transmitting module, and a processing module. The sending module is configured to send a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to return the circuit domain. The receiving module is configured to receive a second message sent by the base station, where the second message is used to indicate a manner in which the circuit path of the first terminal falls back. The processing module is configured to perform circuit domain fallback according to the second message.

In a possible design, the processing module is further configured to: reserve a radio resource control RRC connection with the base station when the circuit domain falls back; or suspend an RRC connection with the base station when the circuit domain falls back.

In a seventh aspect, the embodiment of the present invention provides a base station, where the base station can implement the functions performed by the base station in the application authorization method of the foregoing first aspect, and the functions can be implemented by using hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the base station includes a processor, a memory, and a communication interface. The memory is used to store program instructions. The processor is configured to: according to the program instruction stored in the memory, to: the communication interface receives the first message sent by the mobility management entity, the first message is used to indicate that the first terminal of the base station needs to return the circuit domain; and the first terminal and the second terminal are determined. The connection technology indicates that the communication interface sends a second message to the first terminal according to the connection technology, where the second message is used to indicate the manner in which the first terminal circuit domain falls back.

In a possible design, the processor is further configured to: according to the program instructions stored in the memory, perform the following operations: determining a connection technology between the first terminal and the second terminal according to the context information of the first terminal; or indicating the communication interface Receiving the first indication information sent by the mobility management entity, and determining a connection technology between the first terminal and the second terminal according to the first indication information; or instructing the communication interface to receive the second indication information sent by the first terminal, and according to the The two indication information determines a connection technique between the first terminal and the second terminal.

In one possible design, the processor is further configured to: according to the program instructions stored in the memory, determine that the connection technology is a non-3rd generation partnership plan non-3GPP technology, and instruct the communication interface to connect to the first terminal according to the connection technology Sending a second message, the second message indicating that the first terminal reserves the radio resource control RRC connection with the base station when the circuit domain falls back; or determining that the connection technology is 3GPP technology, and instructing the communication interface to send the first interface to the first terminal according to the connection technology The second message indicates that the first terminal suspends and the RRC connection between the base station when the circuit domain falls back.

In a possible design, the processor is further configured to: according to the program instructions stored in the memory, determine that the connection technology is a non-3GPP technology, and if the inactivity timer of the second terminal expires, the RRC of the second terminal is not released. connection.

The eighth aspect of the present invention provides a mobility management entity, which can implement the functions performed by the mobility management entity in the application authorization method of the foregoing first aspect, and the functions can be implemented by hardware or by hardware. The corresponding software implementation. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the mobility management entity includes a processor, a memory, and a communication interface. The memory is used to store program instructions. The processor is configured to: according to the program instruction stored in the memory, the communication interface is configured to receive the first message sent by the first terminal, the first message is used to indicate that the first terminal needs to return the circuit domain; and the communication interface is configured to receive the The second message is used to indicate that the first terminal of the base station needs to return the circuit domain.

According to a ninth aspect, the embodiment of the present invention provides a terminal, where the terminal can implement the function performed by the terminal in the application authorization method of the first aspect, and the function can be implemented by using hardware or by executing corresponding software through hardware. achieve. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the terminal includes a processor, a memory, and a communication interface. The memory is used to store program instructions. The processor is configured to: according to the program instruction stored in the memory, to: the communication interface sends a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to return the circuit domain; and the communication interface is configured to receive the second a message, the second message is used to indicate a manner in which the first terminal circuit domain falls back; and the circuit domain fallback is performed according to the second message.

In one possible design, the processor is further configured to: perform, according to the program instructions stored in the memory, to reserve a radio resource control RRC connection with the base station when the circuit domain falls back; or to suspend when the circuit domain falls back and RRC connection between base stations.

Compared with the prior art, a method for circuit domain fallback is provided by the embodiment of the present invention, where the first terminal sends the CSFB indication information and the indirect access technology indication information to the base station by using the mobility management entity; or After the management entity sends the CSFB indication information to the base station, the base station sends an indirect access technology query request message to the first terminal, and receives the indirect access technology indication information from the first terminal. The base station determines a connection technology between the first terminal and the second terminal according to the indirect access technology indication information. When the base station determines that the first terminal and the second terminal are connected by using the non-3GPP technology through the indirect access technology indication information, the base station will not release the RRC connection with the first terminal, but send the RRC connection reconfiguration message to the first terminal. The first terminal can enable the PS service to be performed by the connection with the second terminal while the information of the 2G or 3G cell included in the message is dropped back to the circuit domain for CS service. When the base station determines, by using the indirect access technology indication information, that the first terminal and the second terminal are connected by using the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can be based on the 2G or 3G cell included in the message. The information falls back to the circuit domain for CS services. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

DRAWINGS

FIG. 1 is a diagram of a usage environment of a wearable device according to an embodiment of the present invention;

2 is a schematic diagram of communication of a circuit domain fallback method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a CS voice service and a PS service performed by a wearable device according to an embodiment of the present disclosure;

4 is a schematic diagram of another circuit domain fallback method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of communication of a circuit domain fallback method according to an embodiment of the present disclosure;

6 is a schematic diagram of communication of another circuit domain fallback method according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a mobility management entity according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another base station according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another mobility management entity according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of another terminal according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

It should be noted that the first terminal in the embodiment of the present invention may be any one of a plurality of devices, such as a smart watch, a smart wristband, and smart glasses. The first terminal may pass its own radio frequency circuit and antenna. Sending a wireless signal to the base station, and also performing data communication with the second terminal through a wireless communication method such as Bluetooth. The second terminal may be a device that can perform PS services, such as a mobile phone.

FIG. 1 is a diagram of a usage environment of a wearable device according to an embodiment of the present invention. The embodiment of the present invention can be applied to the scenario shown in FIG. 1. The embodiment of the present invention relates to a first terminal, where the first terminal can be a wearable device 10, and the wearable device 10 can be wirelessly connected to the network side. The base station 11 and the core network device 13 or wirelessly communicate with one terminal 12. For example, the wearable device 10 can send a wireless signal to the base station 11 through the wireless communication link 14 through the radio frequency circuit and the antenna, requesting the base station 11 to perform the wireless network service to process the specific service requirement of the wearable device 10; for example, The wearable device 10 can match the terminal 12 through its own Bluetooth. After the matching is successful, the mobile phone communicates with the mobile phone through the Bluetooth communication link 15 , and of course, can communicate with the mobile phone through other wireless communication methods, such as radio frequency identification technology, close range Wireless communication technology, etc.

In the embodiment of the present invention, the base station 11 is an evolved base station (eNB) in the Long Term Evolution (LTE) or a 5G access network (RAN).

In the embodiment of the present invention, the core network device 13 may be a Mobility Management Entity (MME), a Serving GateWay (S-GW), a Public Data Network GateWay (P-GW), or a serving gateway node. (Cellular Internet of Things-Serving Gateway Node, C-SGN).

The method for the circuit domain fallback is provided by the embodiment of the present invention, the first terminal sends the CSFB indication information and the indirect access technology indication information to the base station by using the mobility management entity; or, the first terminal sends the CSFB indication to the base station by using the mobility management entity. After the information, the base station sends an indirect access technology query request message to the first terminal, and receives the indirect access technology indication information from the first terminal. The base station determines a connection technology between the first terminal and the second terminal according to the indirect access technology indication information. When the base station determines that the first terminal and the second terminal are connected by using the non-3GPP technology through the indirect access technology indication information, the base station will not release the RRC connection with the first terminal, but send the RRC connection reconfiguration message to the first terminal. The first terminal can enable the PS service to be performed by the connection with the second terminal while the information of the 2G or 3G cell included in the message is dropped back to the circuit domain for CS service. When the base station determines, by using the indirect access technology indication information, that the first terminal and the second terminal are connected by using the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can be based on the 2G or 3G cell included in the message. The information falls back to the circuit domain for CS services. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

2 is a schematic diagram of communication of a circuit domain fallback method according to an embodiment of the present invention. As shown in FIG. 2, this embodiment may include:

Step 201: The first terminal sends an extended service request (Extended Service Request) to the mobility management entity. The ESR message carries the Circuit Switched Fallback (CSFB) indication information and the Indirect Access Tech Indication information.

It should be noted that the ESR message is used to request an extended service. The CSFB indication message is used to indicate that the first terminal is ready to initiate the circuit domain fallback service, and the circuit domain fallback service includes the CSFB calling service, the CSFB called service, and the like. In this embodiment of the present invention, the first terminal prepares to initiate the CSFB calling service as an example to the circuit. The method of domain fallback is explained. The indirect access technology indication message is used to indicate a connection technology between the first terminal and the second terminal, and the connection technology is a non-third generation partnership project (3GPP) technology or a 3GPP technology, and the first terminal passes the The second terminal establishes a communication connection with the base station.

Exemplary, non-3GPP technologies include wireless communication technologies such as Bluetooth (BT) technology, Wireless-Fidelity (Wi-Fi) technology, and the like.

Exemplarily, the 3GPP technology includes communication technologies such as Device-to-Device (D2D) technology.

Exemplarily, in step 201, the sending, by the first terminal, the ESR message to the mobility management entity may be: the first terminal sends an ESR message to the second terminal, and the second terminal sends the ESR message to the mobility management entity.

Step 202: The base station receives a UE Context Modification Request message from the mobility management entity, where the terminal context modification request message carries CSFB indication information and indirect access technology indication information.

It should be noted that the terminal context modification request message is used to request the base station to modify the context of the first terminal. The context of the first terminal includes Radio Resource Control (RRC) connection information or an access bearer between the serving gateway and the base station.

Exemplarily, after step 202, the method may further include: the base station sending a UE context Modification Response (UE context Modification Response) message to the mobility management entity, where the message is used to notify the mobility management entity that the base station has received the terminal context modification request information and Processing will continue based on the request information.

Optionally, in step 203, the base station receives, from the first terminal, a measurement report of a second generation mobile telephone communication technology (2G) or a third generation mobile communication technology (3rd-generation, 3G) cell, and according to The measurement report determines the target cell. The target cell is a cell that the first terminal needs to access during the circuit domain fallback process.

The first terminal is usually a single radio (SR) mode, that is, only one carrier frequency wireless signal can be received at one time point, so it cannot reside in the fourth generation mobile communication technology (4rd-Generation mobile communication technology, 4G) Cell and 2G cell, or 4G cell and 3G cell. In the 2G communication technology and the 3G communication technology, the core network is divided into a CS domain and a Packet Switch (PS) domain, and the first terminal can perform voice services through circuit signals in the CS domain and through a network protocol in the PS domain. Internet Protocol, IP) data packets for data services. In the 4G communication technology, the CS domain is cancelled, and the first terminal cannot enter the CS domain to perform voice service when accessing the 4G cell.

Step 204: The base station determines that the indirect access technology indication information indicates that the connection technology between the first terminal and the second terminal is a non-3GPP technology, and sends an RRC connection reconfiguration message to the first terminal.

It should be noted that the RRC connection reconfiguration message is used to reconfigure the radio resource control connection of the first terminal. The RRC reconfiguration message sent by the base station to the first terminal carries the access information of the target cell. For example, the goal is small The access information of the area may be derived from the access information of the target cell determined by the base station according to the measurement report received from the first terminal in step 203. For another example, the base station does not receive the measurement report of the 2G or 3G cell from the first terminal, that is, step 203 is not performed, and the access information of the target cell is already stored in the base station.

Exemplarily, the step 204 may be that the base station determines, by using the context information of the first terminal, that the connection technology between the first terminal and the second terminal is a non-3GPP technology, and sends an RRC connection reconfiguration message to the first terminal.

Exemplarily, in step 204, the base station sends an RRC connection reconfiguration message to the first terminal, where the base station sends an RRC connection reconfiguration message to the second terminal, and the second terminal sends an RRC connection reconfiguration message to the first terminal. .

Exemplarily, after step 204, the method further includes: the base station receiving an RRC connection reconfiguration complete message from the first terminal. Alternatively, the second terminal receives an RRC connection reconfiguration complete message from the first terminal, and the base station receives an RRC connection reconfiguration complete message from the second terminal. The RRC connection reconfiguration complete message is used to notify the base station that the first terminal has completed RRC connection reconfiguration.

Exemplarily, after the step 204, the method may further include: the first terminal accessing the target cell according to the access information of the target cell carried in the RRC reconfiguration message.

It should be noted that, in step 204, after determining that the connection technology between the first terminal and the second terminal is a non-3GPP technology, the base station will not release its RRC connection with the first terminal. Therefore, the first terminal can perform the PS service on the communication system by using the communication link connected to the second terminal while performing the CS voice service through the link directly connected to the base station. For example, as shown in FIG. 3, the first terminal establishes a connection with the base station and performs CS voice service through the 3GPP radio based on the 2G/3G protocol stack. At the same time, based on Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), Media Access Control (MAC), and Physical Layer (Physical Layer, PHY) ), as well as the Bluetooth protocol stack, performs PS services on the communication system via Bluetooth radio. The foregoing communication system may be a Long Term Evolution (LTE) communication system or other communication system.

The method for the circuit domain fallback is provided by the embodiment of the present invention, the first terminal sends the CSFB indication information and the indirect access technology indication information to the base station by using the mobility management entity, and the base station determines the first terminal and the The second terminal is connected by using a non-3GPP technology, and the base station will not release its RRC connection with the first terminal, but send an RRC connection reconfiguration message to the first terminal, so that the first terminal can be in the 2G or 3G according to the message. When the information of the cell falls back to the circuit domain to perform the CS service, the PS service can also be performed through the connection with the second terminal.

FIG. 4 is a schematic diagram of another circuit domain fallback method communication according to an embodiment of the present invention. As shown in FIG. 4, this embodiment may include:

Step 401: The first terminal sends an ESR message to the mobility management entity, where the ESR message carries the circuit domain fallback CSFB indication information.

It should be noted that the ESR message is used to request an extended service. The CSFB indication message is used to indicate that the first terminal is ready to initiate the circuit domain fallback service, and the circuit domain fallback service includes the CSFB calling service, the CSFB called service, and the like. In this embodiment of the present invention, the first terminal prepares to initiate the CSFB calling service as an example to the circuit. The method of domain fallback is explained.

Step 402: The base station receives a terminal context modification request message from the mobility management entity, where the terminal context modification request message includes CSFB indication information.

It should be noted that the terminal context modification request message is used to request the base station to repair the context of the first terminal. change. The context of the first terminal includes RRC connection information or an access bearer between the serving gateway and the base station.

Exemplarily, after step 402, the method may further include: the base station sending, to the mobility management entity, a context modification request response message of the first terminal, where the message is used to notify the mobility management entity that the base station has received the context modification request information of the first terminal and Processing will continue based on the request information.

Optionally, in step 403, the base station receives a measurement report of the 2G or 3G cell from the first terminal, and determines the target cell according to the measurement report. The target cell is a cell that the first terminal needs to access during the circuit domain fallback process.

For a detailed description of the step 403, refer to the description of the step 203 in the foregoing embodiment, and no further details are provided herein.

Step 404: The base station sends an Indirect Access Tech Inquiry message to the first terminal.

It should be noted that the indirect access technology query request message is used to request to query the connection technology between the first terminal and the second terminal, and the connection technology is non-3GPP technology or 3GPP technology, and the first terminal establishes communication with the base station through the second terminal. connection. For a description of 3GPP technology or 3GPP technology, please refer to the above, and no further details are provided herein.

Exemplarily, before step 404, the method further includes: determining, by the base station, that the first terminal is establishing a communication connection with the base station by using the second terminal. For example, in step 402, after receiving the terminal context request message from the mobility management entity, the base station queries the information about the sending terminal context request message to the first terminal of the mobility management entity stored in the base station, and determines that the first terminal is passing the second terminal. Establish a communication connection with the base station. For example, in step 402, after receiving the terminal context modification request message from the mobility management entity, the base station queries the information about the second terminal that is stored in the base station and sends the terminal context request message to the mobile management entity, and determines that the second terminal is down. There is a first terminal.

Step 405: The base station receives an Indirect Access Tech Response message from the first terminal, where the indirect access technology query request response message carries the indirect access technology indication information.

It should be noted that the indirect access technology query request response message is used to notify the base station that the first terminal has received the indirect access technology query request information and completes the indirect access technology query. The indirect access technology indication message is used to indicate a connection technology between the first terminal and the second terminal.

Step 406: The base station determines that the indirect access technology indication information indicates that the connection technology between the first terminal and the second terminal is a non-3GPP technology, and sends an RRC connection reconfiguration message to the first terminal.

For a detailed description of the step 406, reference may be made to the description of the step 204 in the foregoing embodiment, and details are not described herein.

The method for the circuit domain fallback is provided by the embodiment of the present invention. After the first terminal sends the CSFB indication information to the base station by using the mobility management entity, the base station sends an indirect access technology query request message to the first terminal, and receives the information from the first terminal. Indirect access technology indication information. When the base station determines that the first terminal and the second terminal are connected by using the non-3GPP technology through the indirect access technology indication information, the base station will not release the RRC connection with the first terminal, but send the RRC connection reconfiguration message to the first terminal. The first terminal can enable the PS service to be performed by the connection with the second terminal while the information of the 2G or 3G cell included in the message is dropped back to the circuit domain for CS service.

FIG. 5 is a schematic diagram of communication of a circuit domain fallback method according to an embodiment of the present invention. As shown in FIG. 5, this embodiment may include:

Step 501: The first terminal sends an extended service request ESR message to the mobility management entity, where the ESR message carries the CSFB indication information and the indirect access technology indication information.

Step 502: The base station receives a terminal context modification request message from the mobility management entity, where the terminal context modification request message includes CSFB indication information and indirect access technology indication information.

Optionally, in step 503, the base station receives a measurement report of the 2G or 3G cell from the first terminal, and determines the target cell according to the measurement report. The target cell is a cell that the first terminal needs to access during the circuit domain fallback process.

It should be noted that, for the specific description of the step 501, the step 502, and the step 503, refer to the description of the step 201, the step 202, and the step 203 in the foregoing embodiment, and details are not described herein.

Step 504: The base station determines that the indirect access technology indication information indicates that the connection technology between the first terminal and the second terminal is a 3GPP technology, and sends an RRC connection suspension (connection Suspend) message to the first terminal.

It should be noted that the RRC connection suspension message is used to request the first terminal to reserve the context of the RRC connection. The RRC connection suspension message sent by the base station to the first terminal carries the access information of the target cell. For example, the access information of the target cell may be derived from the access information of the target cell determined by the base station according to the measurement report received from the first terminal in step 503. For another example, the base station does not receive the measurement report of the 2G or 3G cell from the first terminal, that is, step 503 is not performed, and the access information of the target cell is already stored in the base station.

Exemplarily, the step 504 is further performed by the base station determining, by using the context information of the first terminal, that the connection technology between the first terminal and the second terminal is a 3GPP technology, and sending an RRC connection suspension message to the first terminal.

Exemplarily, in step 504, the base station sends an RRC connection suspension message to the first terminal, where the base station sends an RRC connection suspension message to the second terminal, and the second terminal sends an RRC connection suspension message to the first terminal. .

Exemplarily, after step 504, the method further includes: the base station sending a terminal context modification request response message and an RRC connection suspension complete message to the mobility management entity. The terminal context modification request response message is used to inform the mobility management entity that the base station has received the terminal context modification request information and will continue processing according to the request information. The RRC Connection Suspend Complete message is used to inform the mobility management entity that the base station has completed the RRC connection suspension, that is, the RRC connection context is reserved at the base station and the first terminal device.

It should be noted that the suspend state means that the base station side and the first terminal side respectively retain the context information of the RRC connection, but the RRC connection cannot be used. When the first terminal is in the suspended state, the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened, so that the first terminal can quickly return after ending the CS voice. Previous communication networks, such as LTE networks.

Exemplarily, after step 504, the method further includes: the inactivity timer of the second terminal is timed out, and the base station does not release the RRC connection of the second terminal. Generally, after determining that the second terminal does not perform data reception and transmission services, the base station starts an inactivity timer to save channel resources and power consumption of the terminal, and the inactive timer records that the second terminal does not perform data transmission and reception services. After the time reaches the predetermined time limit, the base station will release the second terminal to enter the idle state. When the second terminal enters the connected state from the idle state, the RRC connection needs to be re-established through the relevant signaling of the RRC connection. In the embodiment of the present invention, when the base station determines that the second terminal does not perform the data receiving and sending services, the base station does not start the inactivity timer, and the second terminal cannot enter the idle state, so that the first terminal can quickly complete the CS voice service. Accessing the second terminal to perform the PS service saves the time and signaling consumption of the terminal from the idle state to the connected state.

Step 505: The mobility management entity sends a Release Access Bearer Request (Release Access Bearer Request) message to the Serving GateWay (SGW).

It should be noted that the release access bearer request message is used to request the serving gateway to release the access bearer between the serving gateway and the base station.

Exemplarily, after step 505, the method further includes: the mobility management entity receiving, from the SGW, a release access bearer request response (Release Access Bearer Response) message, where the message is used to notify the mobility management entity that the SGW has been released from the base station Access bearer.

The method for the circuit domain fallback is provided by the embodiment of the present invention, the first terminal sends the CSFB indication information and the indirect access technology indication information to the base station by using the mobility management entity, and the base station determines the first terminal and the The second terminal is connected by using the 3GPP technology, and the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

FIG. 6 is a schematic diagram of communication of another circuit domain fallback method according to an embodiment of the present invention. As shown in FIG. 6, this embodiment may include:

Step 601: The first terminal sends an ESR message to the mobility management entity, where the ESR message carries the CSFB indication information.

Step 602: The base station receives a terminal context modification request message from the mobility management entity, where the terminal context modification request message includes CSFB indication information.

Optionally, in step 603, the base station receives, from the first terminal, information about at least one cell that is accessible during the circuit domain fallback process, and the base station determines, according to the information of the at least one cell that can be accessed, the cell that needs to be accessed.

Step 604: The base station sends an indirect access technology query request message to the first terminal.

Step 605: The base station receives an indirect access technology query request response message from the first terminal, and the indirect access technology query request response message carries the indirect access technology indication information.

It should be noted that, for the specific description of the steps 601-605, refer to the description of the steps 401-405 in the foregoing embodiment, and details are not described herein.

Step 606: The base station determines that the indirect access technology indication information indicates that the connection technology between the first terminal and the second terminal is a 3GPP technology, and sends an RRC connection suspension message to the first terminal.

Step 607: The mobility management entity sends a release access bearer request message to the SGW.

It should be noted that, for specific descriptions of the steps 606 and 607, refer to the description of the steps 504 and 505 in the foregoing embodiment, and details are not described herein.

The method for the circuit domain fallback is provided by the embodiment of the present invention. After the first terminal sends the CSFB indication information to the base station by using the mobility management entity, the base station sends an indirect access technology query request message to the first terminal, and receives the information from the first terminal. Indirect access technology indication information. When the base station determines that the first terminal and the second terminal are connected by using the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can be based on the 2G or 3G cell included in the message. The information falls back to the circuit domain for CS services. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

The method of circuit domain fallback according to an embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 6, and the base station, the mobility management entity, and the terminal according to the embodiment of the present invention are described in detail below with reference to FIG.

FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 700 can include a sending module 701, a receiving module 702, and a processing module 703.

Those skilled in the art will appreciate that Figure 7 only shows a simplified design of the structure of the base station. The base station structure shown in FIG. 7 does not constitute a limitation to a base station, which may include more or less components than shown in FIG. 7, for example, the base station may further include a storage module for storing corresponding instructions of the communication algorithm. In addition, in order to save chip area, the receiving module 702 and the transmitting module 701 can also be integrated to form a transceiver.

As shown in FIG. 7, the receiving module 702 is configured to receive a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs to return the circuit domain. The processing module 703 is configured to determine a connection technology between the first terminal and the second terminal. The sending module 701 is configured to send a second message to the first terminal according to the connection technology, where the second message is used to indicate a manner in which the first terminal circuit domain falls back.

Exemplarily, the processing module 703 is further configured to: determine, according to the context information of the first terminal, a connection technology between the first terminal and the second terminal; or, after the receiving module 702 receives the first indication information sent by the mobility management entity, Determining, according to the first indication information, a connection technology between the first terminal and the second terminal; or, after the receiving module 702 receives the second indication information sent by the first terminal, determining, by the second indication information, the first terminal and the second terminal The connection between the technology.

Exemplarily, the sending module 701 is further configured to: after the processing module 703 determines that the connection technology is a non-3GPP technology, send a second message to the first terminal according to the connection technology, where the second message indicates that the first terminal retains when the circuit domain falls back And the radio resource control RRC connection between the base station; or, after the processing module 703 determines that the connection technology is the 3GPP technology, sends a second message to the first terminal according to the connection technology, where the second message indicates that the first terminal hangs when the circuit domain falls back From the RRC connection with the base station.

Exemplarily, the processing module 703 is further configured to: after determining that the connection technology is a non-3GPP technology, if the inactivity timer of the second terminal expires, the RRC connection of the second terminal is not released.

The base station provided by the embodiment of the present invention determines the connection technology between the first terminal and the second terminal according to the indirect access technology indication information received from the first terminal or the mobility management entity. When the base station determines that the connection technology is a non-3GPP technology, the base station will not release its RRC connection with the first terminal, but send an RRC connection reconfiguration message to the first terminal, so that the first terminal can be included according to the message. When the information of the 2G or 3G cell falls back to the circuit domain for CS service, the PS service can also be performed through the connection with the second terminal. When the base station determines that the connection technology is the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

FIG. 8 is a schematic structural diagram of a mobility management entity according to an embodiment of the present invention. The mobility management entity 800 can include a sending module 801 and a receiving module 802.

Those skilled in the art will appreciate that Figure 8 only shows a simplified design of the structure of the mobility management entity. The mobility management entity structure shown in FIG. 8 does not constitute a definition of a mobility management entity, and the mobility management entity may include a map. More or less components are shown, for example, the mobility management entity may also include a storage module for storing instructions corresponding to the communication algorithm. As another example, a processing module 803 can be included for processing to operate in accordance with instructions in the memory module. In addition, to save chip area, the receiving module 802 and the transmitting module 801 can also be integrated to form a transceiver.

As shown in FIG. 8, the receiving module 802 is configured to receive a first message sent by the first terminal, where the first message is used to indicate that the first terminal needs to return the circuit domain. The sending module 801 is configured to send a second message to the base station, where the second message is used to indicate that the first terminal of the base station needs to return the circuit domain.

Exemplarily, the first message includes a connection technology between the first terminal and the second terminal.

Exemplarily, the second message includes a connection technology between the first terminal and the second terminal.

The mobility management entity provided by the embodiment of the present invention receives the CSFB indication information and the indirect access technology indication information from the first terminal, and sends the CSFB indication information and the indirect access technology indication information to the base station. The base station can determine, according to the indirect access technology indication information, a connection technology between the first terminal and the second terminal. When the base station determines that the connection technology is a non-3GPP technology, the base station will not release its RRC connection with the first terminal, but send an RRC connection reconfiguration message to the first terminal, so that the first terminal can be included according to the message. When the information of the 2G or 3G cell falls back to the circuit domain for CS service, the PS service can also be performed through the connection with the second terminal. When the base station determines that the connection technology is the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention. The terminal 900 can include a sending module 901, a receiving module 902, and a processing module 903.

Those skilled in the art will appreciate that Figure 9 only shows a simplified design of the structure of the terminal. The terminal structure shown in FIG. 9 does not constitute a limitation to the terminal, and the terminal may include more or less components than the illustration 9, for example, the terminal may further include a storage module for storing corresponding instructions of the communication algorithm. In addition, in order to save chip area, the receiving module 902 and the transmitting module 901 can also be integrated to form a transceiver.

As shown in FIG. 9, the sending module 901 is configured to send a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to return the circuit domain. The receiving module 902 is configured to receive a second message sent by the base station, where the second message is used to indicate a manner in which the first terminal circuit domain falls back. The processing module 903 is configured to perform circuit domain fallback according to the second message.

Exemplarily, the processing module 903 is further configured to reserve a radio resource control RRC connection with the base station when the circuit domain falls back; or suspend the RRC connection with the base station when the circuit domain falls back.

The terminal provided by the embodiment of the present invention, by sending the indirect access technology indication information to the base station, enables the base station to determine the connection technology between the terminal and the second terminal according to the indication information. When the base station determines that the connection technology is a non-3GPP technology, the base station will not release its RRC connection with the terminal, but send an RRC connection reconfiguration message to the terminal, so that the terminal can be in the 2G or 3G according to the message. When the information of the cell falls back to the circuit domain to perform the CS service, the PS service can also be performed through the connection with the second terminal. When the base station determines that the connection technology is the 3GPP technology, the base station sends an RRC connection suspension message to the terminal, so that the terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal according to RRC The connection suspension message retains the RRC context information, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of the user plane establishment is shortened. Therefore, the terminal can quickly return to the previous communication network, such as an LTE network, to perform the PS service after ending the CS service.

FIG. 10 is a schematic structural diagram of another base station according to an embodiment of the present invention. As shown in FIG. 10, the base station 1000 includes components such as a memory 1001, a processor 1002, and a communication interface 1003. The memory 1001 can be used to store program codes and data of the base station. The processor 1002 may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), and a field programmable gate array. (Field Programmable Gate Array, FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication interface is a generic term and can include one or more interfaces. It will be understood by those skilled in the art that the base station structure shown in FIG. 10 does not constitute a limitation to the base station, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements. For example, the base station can also include a bus 1004. The communication interface 1003, the processor 1002, and the memory 1001 may be connected to each other through a bus 1004. The bus 1004 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 1004 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 10, but it does not mean that there is only one bus or one type of bus.

As shown in FIG. 10, a memory 1001 is used to store program instructions. The processor 1002 is configured to: according to the program instruction stored in the memory 1001, the communication interface 1003 is configured to receive the first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs the circuit domain to fall back; The connection between the terminal and the second terminal indicates that the communication interface 1003 sends a second message to the first terminal according to the connection technology, where the second message is used to indicate the manner in which the first terminal circuit domain falls back.

Exemplarily, the processor 1002 is further configured to: according to the program instructions stored in the memory 1001, perform the following operations: determine a connection technology between the first terminal and the second terminal according to the context information of the first terminal; or, instruct the communication interface 1003 to receive a first indication information sent by the mobility management entity, and determining a connection technology between the first terminal and the second terminal according to the first indication information; or indicating that the communication interface 1003 receives the second indication information sent by the first terminal, and according to the The two indication information determines a connection technique between the first terminal and the second terminal.

Exemplarily, the processor 1002 is further configured to: according to the program instructions stored in the memory 1001, determine that the connection technology is a non-3GPP technology, and instruct the communication interface 1003 to send a second message to the first terminal according to the connection technology, and second The message indicates that the first terminal reserves the radio resource control RRC connection with the base station when the circuit domain falls back; or determines that the connection technology is 3GPP technology, and instructs the communication interface 1003 to send the second message to the first terminal according to the connection technology, and second The message indicates that the first terminal suspends an RRC connection with the base station when the circuit domain falls back.

Exemplarily, the processor 1002 is further configured to: according to the program instructions stored in the memory 1001, determine that the connection technology is a non-3GPP technology, and if the inactivity timer of the second terminal expires, the RRC of the second terminal is not released. connection.

FIG. 11 is a schematic structural diagram of another mobility management entity according to an embodiment of the present invention. As shown in FIG. 11, the mobility management entity 1100 includes components such as a memory 1101, a processor 1102, and a communication interface 1103. The memory 1101 can be used to store program code and data of the mobility management entity. The processor 1102 can be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), and a field programmable gate array. (Field Programmable Gate Array, FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication interface is a generic term and can include one or more interfaces. It will be understood by those skilled in the art that the mobility management entity structure shown in FIG. 11 does not constitute a limitation on the mobility management entity, may include more or less components than illustrated, or combine some components, or different component arrangements. . For example, the mobility management entity may also include a bus 1104. The communication interface 1103, the processor 1102, and the memory 1101 may be connected to each other through a bus 1104. The bus 1104 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 1104 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.

As shown in FIG. 11, a memory 1101 is provided for storing program instructions. The processor 1102 is configured to: according to the program instruction stored in the memory 1101, the communication interface 1103 is configured to receive the first message sent by the first terminal, where the first message is used to indicate that the first terminal needs to return the circuit domain; and the communication interface is indicated 1103: The second message is sent to the base station, where the second message is used to indicate that the first terminal of the base station needs to return the circuit domain.

The mobility management entity provided by the embodiment of the present invention receives the CSFB indication information and the indirect access technology indication information from the first terminal, and sends the CSFB indication information and the indirect access technology indication information to the base station. The base station can determine, according to the indirect access technology indication information, a connection technology between the first terminal and the second terminal. When the base station determines that the connection technology is a non-3GPP technology, the base station will not release its RRC connection with the first terminal, but send an RRC connection reconfiguration message to the first terminal, so that the first terminal can be included according to the message. 2G or 3G cell letter While the information falls back to the circuit domain for CS service, the PS service can also be performed through the connection with the second terminal. When the base station determines that the connection technology is the 3GPP technology, the base station sends an RRC connection suspension message to the first terminal, so that the first terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the first terminal can quickly return to the previous communication network, such as the LTE network, to perform the PS service after ending the CS service.

FIG. 12 is a schematic structural diagram of another terminal according to an embodiment of the present invention. As shown in FIG. 12, the terminal 1200 includes: a radio frequency (RF) circuit 1210, a memory 1220, an input unit 1230, a display unit 1240, a processor 1250, a wireless local area network (WLAN) module 1260, and a power supply. 1270 and Bluetooth module 1280 and other components. It will be understood by those skilled in the art that the terminal structure shown in FIG. 12 does not constitute a limitation of the terminal, and may include more or less components than those illustrated, or a combination of certain components, or different component arrangements.

The RF circuit 1210 can be used to send and receive information, for example, to connect to a mobile broadband. Generally, RF circuit 1210 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuit 1210 can also forward the mobile bandwidth traffic to the WLAN module 1260 to forward the mobile bandwidth traffic to other terminals via the WLAN module 1260. Among them, wireless communication can adopt any communication standard or protocol, including but not limited to Global System of Mobile communication (GSM), General Packet Radio Service (GPRS), and code division multiple access (Code). Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), E-mail, Short Messaging Service (SMS), etc.

The memory 1220 can be used to store program instructions, and the processor 1250 causes the terminal to perform the above-described method of circuit domain fallback as shown in FIG. 2, FIG. 4, FIG. 5 or FIG. 6 by running program instructions stored in the memory 1220. The memory 1220 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system and an application program and the like required to implement the above-described circuit domain fallback method. The storage data area can store list information of the terminal and data generated by the terminal when performing the above method of circuit domain fallback. In addition, the memory 1220 may include a volatile memory, such as a random-access memory (RAM); the memory 1220 may also include a non-volatile memory, such as only Read-only memory (ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD). The memory 1220 may also include a combination of the above types of memories.

The input unit 1230 can be configured to receive numeric or character information input by the user, including turning on a WLAN hotspot command, selecting an instruction of a terminal sharing the WLAN hotspot, and the like. Specifically, the input unit 1230 may include a touch panel 1231 and other input devices 1232. The touch panel 1231, also referred to as a touch screen, can collect touch operations on or near the user (such as the user using a finger, a stylus, or the like on the touch panel 1231 or near the touch panel 1231. Operation), and drive the corresponding connecting device according to a preset program. Optionally, the touch panel 1231 may include two parts: a touch detection device and a touch controller. Wherein, the touch detection device detects the touch orientation of the user, and detects a signal brought by the touch operation, and transmits a signal to the touch controller; the touch controller receives the signal from the touch detection device. The information is touched and converted to contact coordinates, sent to processor 1250, and can receive commands from processor 1250 and execute. In addition, the input unit 1230 can implement the touch panel 1231 by using various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 1231, the input unit 1230 may also include other input devices 1232. Specifically, other input devices 1232 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and the like.

The display unit 1240 can be used to display information input by the user or information provided to the user as well as various menus of the terminal. The display unit 1240 can include a display screen 1241. Alternatively, the display screen 1241 can be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. Further, the touch panel 1231 may cover the display screen 1241. When the touch panel 1231 detects a touch operation thereon or nearby, the touch panel 1231 transmits to the processor 1250 to determine the type of the touch event, and then the processor 1250 according to the touch event. The type provides a corresponding visual output on display screen 1241. Although in FIG. 12, the touch panel 1231 and the display screen 1241 are used as two independent components to implement the input and input functions of the terminal, in some embodiments, the touch panel 1231 may be integrated with the display 1241. Realize the input and output functions of the terminal.

The processor 1250 is a control center of the terminal that connects various portions of the entire terminal using various interfaces and lines, by executing or executing software programs and/or modules stored in the memory 1220, and invoking data stored in the memory 1220, The method of circuit domain fallback as shown in FIG. 2, FIG. 4, FIG. 5 or FIG. Optionally, the processor 1250 can include one or more processing units. Preferably, the processor 1250 can integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, an application, etc., and the modem processor mainly processes wireless communication. It will be appreciated that the above described modem processor may also not be integrated into the processor 1250.

The WLAN module 1260 can be used to assist users in sending and receiving emails, browsing web pages, and accessing streaming media, etc., which provides users with wireless broadband WLAN Internet access. The WLAN is a short-range wireless transmission technology. The terminal can access the WLAN hotspot through the WLAN module 1260. The WLAN hotspot can be enabled by the WLAN module 1260 to forward the mobile bandwidth service to other terminals. The WLAN module 1260 can also perform Wi-Fi broadcasts and scans to enable wireless communication with other nearby terminals.

The terminal also includes a power supply 1270 (such as a battery) for powering various components. Alternatively, the power supply can be logically coupled to the processor 1250 through a power management system to manage functions such as charging, discharging, and power consumption through the power management system.

The Bluetooth module 1270 can be a Bluetooth Low Energy (BLE) device, a traditional Bluetooth device, or a dual-mode Bluetooth device supporting legacy Bluetooth and BLE. The Bluetooth module 1270 establishes a BLE or classic Bluetooth connection with the Bluetooth module of other terminals, and the Bluetooth module 1270 can also perform BR or BLE broadcast and scanning to achieve wireless communication with other terminals nearby.

Although not shown, the terminal may further include a camera, a speaker, etc., and details are not described herein again.

Illustratively, RF circuit 1210, Bluetooth module 1280, and WLAN module 1260 can be collectively referred to as a communication interface.

Illustratively, the terminal includes a processor 1250, a memory 1220, and a communication interface. The memory 1220 is for storing program instructions. The processor 1250 is configured to perform, according to the program instruction stored in the memory 1220, the communication interface to send a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to return the circuit domain. And instructing the communication interface to receive the second message sent by the base station, the second message is used to indicate the manner in which the first terminal circuit domain falls back; and the circuit domain fallback is performed according to the second message.

Exemplarily, the processor 1250 is further configured to: according to the program instructions stored in the memory 1220, perform the following operations: reserve a radio resource control RRC connection with the base station when the circuit domain falls back; or suspend and base station when the circuit domain falls back Between the RRC connection.

The terminal provided by the embodiment of the present invention, by sending the indirect access technology indication information to the base station, enables the base station to determine the connection technology between the terminal and the second terminal according to the indication information. When the base station determines that the connection technology is a non-3GPP technology, the base station will not release its RRC connection with the terminal, but send an RRC connection reconfiguration message to the terminal, so that the terminal can be in the 2G or 3G according to the message. When the information of the cell falls back to the circuit domain to perform the CS service, the PS service can also be performed through the connection with the second terminal. When the base station determines that the connection technology is the 3GPP technology, the base station sends an RRC connection suspension message to the terminal, so that the terminal can fall back to the circuit domain according to the information of the 2G or 3G cell included in the message to perform the CS service. At the same time, the second terminal retains the RRC context information according to the RRC connection suspension message, so that the RRC connection between the base station and the base station can be directly restored by a resume message, and the delay of establishing the user plane is shortened. Therefore, the terminal can quickly return to the previous communication network, such as an LTE network, to perform the PS service after ending the CS service.

The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A method for circuit domain fallback, characterized in that the method comprises:

Receiving, by the base station, a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs to return the circuit domain;

Determining, by the base station, a connection technology between the first terminal and the second terminal, the base station sending a second message to the first terminal according to the connection technology, where the second message is used to indicate the first The way the terminal circuit domain falls back.
The method according to claim 1, wherein the base station determines a connection technology between the first terminal and the second terminal, including:

Determining, by the base station, a connection technology between the first terminal and the second terminal according to context information of the first terminal; or

The base station receives the first indication information sent by the mobility management entity, and the base station determines, according to the first indication information, a connection technology between the first terminal and the second terminal; or

The base station receives the second indication information sent by the first terminal, and the base station determines, according to the second indication information, a connection technology between the first terminal and the second terminal.
The method according to claim 1, wherein the base station sends a second message to the first terminal according to the connection technology, where the second message is used to indicate a manner in which the first terminal circuit domain falls back ,include:

If the connection technology is a non-3rd Generation Partnership Project non-3GPP technology, the second message indicates that the first terminal reserves a radio resource control RRC connection with the base station when the circuit domain falls back; or

If the connection technology is a 3rd Generation Partnership Project 3GPP technology, the second message indicates that the first terminal suspends a radio resource control RRC connection between the base station when the circuit domain falls back.
The method of claim 3, wherein if the connection technology is non-3GPP technology, the method further comprises:

If the inactivity timer of the second terminal times out, the base station does not release the RRC connection of the second terminal.
A method for circuit domain fallback, characterized in that the method comprises:

The mobile management entity receives the first message sent by the first terminal, where the first message is used to indicate that the first terminal needs to return the circuit domain;

The mobility management entity sends a second message to the base station, where the second message is used to indicate that the first terminal of the base station needs to return the circuit domain.
The method according to claim 5, wherein the first message comprises a connection technique between the first terminal and the second terminal.
The method according to claim 5, wherein the second message comprises a connection technique between the first terminal and the second terminal.
A method for circuit domain fallback, characterized in that the method comprises:

The first terminal sends a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs to Want the circuit domain to fall back;

The first terminal receives a second message sent by the base station, where the second message is used to indicate a manner in which the first terminal circuit domain falls back, and the first terminal performs circuit domain fallback according to the second message.
The method according to claim 8, wherein the first message comprises a connection technique between the first terminal and the second terminal.
The method according to claim 8, wherein the first terminal performs circuit domain fallback according to the second message, including:

The first terminal reserves a radio resource control RRC connection with the base station when the circuit domain falls back;

Alternatively, the first terminal suspends an RRC connection with the base station when the circuit domain falls back.
A base station, the base station includes:

a receiving module, configured to receive a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs to return the circuit domain;

a processing module, configured to determine a connection technology between the first terminal and the second terminal;

And a sending module, configured to send a second message to the first terminal according to the connection technology, where the second message is used to indicate a manner in which the first terminal circuit domain falls back.
The base station according to claim 11, wherein the processing module is further configured to:

Determining, according to the context information of the first terminal, a connection technology between the first terminal and the second terminal; or

After the receiving module receives the first indication information sent by the mobility management entity, determining, according to the first indication information, a connection technology between the first terminal and the second terminal; or

After the receiving module receives the second indication information sent by the first terminal, determining a connection technology between the first terminal and the second terminal according to the second indication information.
The base station according to claim 11, wherein the sending module is further configured to:

After the processing module determines that the connection technology is a non-3rd generation partnership plan non-3GPP technology, sending a second message to the first terminal according to the connection technology, where the second message indicates the first Retaining, by the terminal, a radio resource control RRC connection with the base station when the circuit domain falls back; or

After the processing module determines that the connection technology is the 3rd Generation Partnership Project 3GPP technology, sends a second message to the first terminal according to the connection technology, where the second message indicates that the first terminal is in the circuit When the domain falls back, the RRC connection between the base station and the base station is suspended.
The base station according to claim 13, wherein the processing module is further configured to: after determining that the connection technology is a non-3GPP technology, if the inactivity timer of the second terminal times out, does not release the The radio resource control RRC connection of the second terminal is described.
A mobility management entity, characterized in that the mobility management entity comprises:

a receiving module, configured to receive a first message sent by the first terminal, where the first message is used to indicate that the first terminal needs a circuit domain to fall back;

And a sending module, configured to send a second message to the base station, where the second message is used to indicate that the first terminal of the base station needs a circuit domain to fall back.
The mobility management entity according to claim 15, wherein the first message comprises a connection technique between the first terminal and the second terminal.
The mobility management entity according to claim 15, wherein the second message comprises a connection technique between the first terminal and the second terminal.
A terminal, wherein the terminal comprises:

a sending module, configured to send a first message to the mobility management entity, where the first message is used to indicate that the first terminal needs a circuit domain to fall back;

a receiving module, configured to receive a second message sent by the base station, where the second message is used to indicate a manner in which the first terminal circuit domain falls back;

And a processing module, configured to perform circuit domain fallback according to the second message.
The terminal according to claim 18, wherein the first message comprises a connection technology between the first terminal and the second terminal.
The terminal according to claim 18, wherein the processing module is further configured to:

Retaining a radio resource control RRC connection with the base station when the circuit domain falls back; or

The RRC connection between the base station and the base station is suspended when the circuit domain falls back.
A base station, the base station comprising: a processor, a memory, and a communication interface;

The memory is configured to store program instructions;

The processor is configured to perform the following operations according to program instructions stored in the memory:

Instructing the communication interface to receive a first message sent by the mobility management entity, where the first message is used to indicate that the first terminal of the base station needs a circuit domain to fall back; and determining a connection technology between the first terminal and the second terminal, Instructing the communication interface to send a second message to the first terminal according to the connection technology, where the second message is used to indicate a manner in which the first terminal circuit domain falls back.
The base station according to claim 21, wherein the processor is further configured to perform the following operations according to the program instructions stored in the memory:

Determining, according to the context information of the first terminal, a connection technology between the first terminal and the second terminal; or

Instructing the communication interface to receive the first indication information sent by the mobility management entity, and determining a connection technology between the first terminal and the second terminal according to the first indication information; or

Instructing the communication interface to receive the second indication information sent by the first terminal, and determining a connection technology between the first terminal and the second terminal according to the second indication information.
The base station according to claim 21, wherein the processor is further configured to perform the following operations according to the program instructions stored in the memory:

Determining that the connection technology is a non-3rd Generation Partnership Project non-3GPP technology, and instructing the communication interface to send a second message to the first terminal according to the connection technology, the second message indicating the first Retaining, by the terminal, a radio resource control RRC connection with the base station when the circuit domain falls back; or

Determining that the connection technology is a 3rd Generation Partnership Project 3GPP technology, and instructing the communication interface to send a second message to the first terminal according to the connection technology, the second message indicating that the first terminal is in a circuit area The RRC connection between the base station and the base station is suspended.
The base station according to claim 23, wherein the processor is further configured to perform the following operations according to the program instructions stored in the memory:

Determining that the connection technology is a non-3GPP technology, and if the inactivity timer of the second terminal times out, the RRC connection of the second terminal is not released.
A mobility management entity, characterized in that the mobility management entity comprises: a processor, a memory and a communication interface;

The memory is configured to store program instructions;

The processor is configured to perform the following operations according to program instructions stored in the memory:

Instructing the communication interface to receive a first message sent by the first terminal, the first message is used to indicate that the first terminal needs a circuit domain to fall back, and the communication interface is configured to receive a second message sent to the base station, where the The second message is used to indicate that the first terminal of the base station needs a circuit domain fallback.
The mobility management entity according to claim 25, wherein the first message comprises a connection technique between the first terminal and the second terminal.
The mobility management entity according to claim 25, wherein said second message comprises a connection technique between said first terminal and said second terminal.
A terminal, the terminal comprising: a processor, a memory, and a communication interface;

The memory is configured to store program instructions;

The processor is configured to perform the following operations according to program instructions stored in the memory:

Instructing the communication interface to send a first message to the mobility management entity, the first message is used to indicate that the first terminal needs a circuit domain to fall back, and instruct the communication interface to receive a second message sent by the base station, where the second message The message is used to indicate a manner in which the first terminal circuit domain falls back; and the circuit domain fallback is performed according to the second message.
The terminal according to claim 28, wherein the first message comprises a connection technology between the first terminal and the second terminal.
The terminal according to claim 28, wherein the processor is further configured to: perform the following operations according to program instructions stored in the memory:

Retaining a radio resource control RRC connection with the base station when the circuit domain falls back; or

The RRC connection between the base station and the base station is suspended when the circuit domain falls back.