Network rollback method, terminal device and access network device

Abstract

The present application discloses a network fallback method, terminal device and access network device, the method comprising: the terminal device receives indication information sent by the access network, the indication information is used to indicate whether the first network supports the specific service to be executed by the terminal device; if the indication information indicates that the first network does not support the specific service, the terminal device initiates the specific service in the second network. When the terminal device cannot initiate a characteristic service in the current network, it can initiate the specific service in other networks based on the indication of the access network, avoiding complex signaling interaction between the terminal device and the core network, and reducing the delay of the network fallback process.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communications, and more specifically, to a network fallback method, a terminal device, and an access network device. Background Art

[0002] In the Long Term Evolution (LTE) system, the Circuit Switch FallBack (CSFB) technology is a temporary solution for providing voice services to multi-mode single-standby terminal devices in the Time Division LTE (TD-LTE) system. The data service and SMS service of the terminal device are carried by the LTE network, and the telephone service falls back to the Circuit Switch (CS) network. During the fallback process, the data service will be interrupted, and the terminal device will return to the LTE network after the telephone service ends.

[0003] In the existing CSFB process, the terminal device needs to perform complex signaling interaction with the core network, which results in a long network rollback time and increases the network rollback delay. Summary of the invention

[0004] The embodiments of the present application provide a network fallback method, terminal equipment and access network equipment, which can reduce the delay of the network fallback process.

[0005] In a first aspect, a network fallback method is provided, comprising: a terminal device receives indication information sent by an access network, the indication information being used to indicate whether a first network supports a specific service to be executed by the terminal device; if the indication information indicates that the first network does not support the specific service, the terminal device initiates the specific service in a second network.

[0006] Therefore, when the terminal device is unable to initiate a feature service in the current network, it can initiate the specific service in other networks based on the instructions of the access network, avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0007] In a possible implementation, the first network includes the access network, the core network to which the access network belongs, the public land mobile communication network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0008] In a possible implementation manner, the specific service includes a voice service or a video service.

[0009] In a possible implementation manner, before the terminal device receives the indication information sent by the access network, the method further includes: the terminal device sending a service request message to the access network, where the service request message is used to request execution of the specific service in the first network;

[0010] The step of the terminal device receiving indication information sent by the access network includes: the terminal device receiving the indication information sent by the access network according to the service request message.

[0011] In a possible implementation, the terminal device sends a service request message to the access network, including: the terminal device sends a wireless network control RRC connection establishment request message to the access network, and the RRC connection establishment request message carries the service request information; or the terminal device sends an RRC connection establishment completion message to the access network, and the RRC connection establishment completion message carries the service request information.

[0012] In a possible implementation manner, the service request message carries the network identifier of the first network.

[0013] In a possible implementation manner, the terminal device receives indication information sent by the access network, including: the terminal device receives system information sent by the access network, and the system information carries the indication information.

[0014] In a possible implementation manner, if the indication information indicates that the first network does not support the specific service, the indication information is further used to indicate the second network,

[0015] The terminal device initiating the specific service in the second network includes: the terminal device initiating the specific service in the second network indicated by the indication information.

[0016] In a possible implementation manner, the terminal device initiating the specific service in the second network includes: the terminal device determining the second network among multiple networks, and initiating the specific service in the second network.

[0017] In one possible implementation, if the indication information indicates that the first network does not support the specific service, then before the terminal device initiates the specific service in the second network, the method also includes: the terminal device receives an RRC connection release message sent by the access network; and the terminal device releases the RRC connection with the first network according to the RRC connection release message.

[0018] According to a second aspect, a network fallback method is provided, comprising: an access network device determines whether a first network supports a specific service to be executed by a terminal device; the access network device sends indication information to the terminal device, wherein the indication information is used to indicate whether the first network supports the specific service, so that the terminal device can initiate the specific service in a second network when the first network does not support the specific service.

[0019] Therefore, when the terminal device is unable to initiate a feature service in the current network, the access network device instructs the terminal device to initiate the specific service in other networks, so that the terminal device can initiate the specific service in other networks based on the instruction of the access network, thereby avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0020] In one possible implementation, the first network includes the access network where the access network device is located, the core network to which the access network belongs, the public land mobile communication network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0021] In a possible implementation manner, the specific service includes a voice service or a video service.

[0022] In one possible implementation, the access network device determines whether the first network supports a specific service to be executed by the terminal device, including: the access network device receives information sent by the core network indicating whether the first network supports the specific service; or the access network device sends an inquiry message to the core network, and receives information sent by the core network according to the inquiry message indicating whether the first network supports the specific service; or the access network device determines whether the first network supports the specific service based on pre-configured information indicating whether the first network supports the specific service.

[0023] In a possible implementation, before the access network device determines whether the first network supports the specific service to be executed by the terminal device, the method further includes: the access network device receiving a service request message sent by the terminal device, where the service request message is used to request execution of the specific service in the first network;

[0024] The step of sending indication information by the access network device to the terminal device includes: the access network device sending the indication information to the terminal device according to the service request message.

[0025] In a possible implementation, the access network device receives a service request message sent by the terminal device, including: the access network device receives a wireless network control RRC connection establishment request message sent by the terminal device, and the RRC connection establishment request message carries the service request information; or the access network device receives an RRC connection establishment completion message sent by the terminal device, and the RRC connection establishment completion message carries the service request information.

[0026] In a possible implementation manner, the service request message carries the network identifier of the first network.

[0027] In a possible implementation manner, the access network device sends indication information to the terminal device, including: the access network device sends system information to the terminal device, and the system information carries the indication information.

[0028] In a possible implementation, if the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network so that the terminal device initiates the specific service in the second network indicated by the indication information.

[0029] In one possible implementation, if the access network device determines that the first network does not support the specific service, the method further includes: the access network device sends an RRC connection release message to the terminal device, so that the terminal device releases the RRC connection with the first network according to the RRC connection release message.

[0030] In a third aspect, a terminal device is provided, which can perform the operations of the terminal device in the first aspect or any optional implementation of the first aspect. Specifically, the terminal device may include a module unit for performing the operations of the terminal device in the first aspect or any possible implementation of the first aspect.

[0031] In a fourth aspect, an access network device is provided, which can perform the operations of the access network device in the second aspect or any optional implementation of the second aspect. Specifically, the access network device may include a module unit for performing the operations of the access network device in the second aspect or any possible implementation of the second aspect.

[0032] In a fifth aspect, a terminal device is provided, the terminal device comprising: a processor, a transceiver, and a memory. The processor, the transceiver, and the memory communicate with each other through an internal connection path. The memory is used to store instructions, and the processor is used to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the execution causes the terminal device to execute the method in the first aspect or any possible implementation of the first aspect, or the execution causes the terminal device to implement the terminal device provided by the third aspect.

[0033] In a sixth aspect, an access network device is provided, the access network device comprising: a processor, a transceiver, and a memory. The processor, the transceiver, and the memory communicate with each other through an internal connection path. The memory is used to store instructions, and the processor is used to execute the instructions stored in the memory. When the processor executes the instructions stored in the memory, the execution causes the access network device to execute the method in the second aspect or any possible implementation of the second aspect, or the execution causes the access network device to implement the access network device provided in the fourth aspect.

[0034] In a seventh aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a program, wherein the program enables a terminal device to execute the network fallback method of the above-mentioned first aspect and any one of its various implementation methods.

[0035] In an eighth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a program, wherein the program enables an access network device to execute the above-mentioned second aspect and any one of the network fallback methods in its various implementation methods.

[0036] In the ninth aspect, a system chip is provided, which includes an input interface, an output interface, a processor and a memory, wherein the processor is used to execute instructions stored in the memory. When the instructions are executed, the processor can implement the method in the aforementioned first aspect or any possible implementation of the first aspect.

[0037] In the tenth aspect, a system chip is provided, which includes an input interface, an output interface, a processor and a memory. The processor is used to execute instructions stored in the memory. When the instructions are executed, the processor can implement the method in the aforementioned second aspect or any possible implementation of the second aspect.

[0038] In an eleventh aspect, a computer program product comprising instructions is provided, and when the computer program product is run on a computer, the computer is caused to execute the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0039] In a twelfth aspect, a computer program product comprising instructions is provided. When the computer program product is run on a computer, the computer is caused to execute the method in the above-mentioned second aspect or any possible implementation manner of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic architecture diagram of an application scenario of an embodiment of the present application.

[0041] Figure 2 It is a flow interaction diagram of the existing network fallback process.

[0042] Figure 3 It is a schematic flowchart of the network rollback method of an embodiment of the present application.

[0043] Figure 4 It is a schematic flowchart of the network rollback method of an embodiment of the present application.

[0044] Figure 5 It is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0045] Figure 6 It is a schematic block diagram of an access network device according to an embodiment of the present application.

[0046] Figure 7 It is a schematic structural diagram of a terminal device according to an embodiment of the present application.

[0047] Figure 8 It is a schematic structural diagram of the access network device of an embodiment of the present application.

[0048] Fig. 9 It is a schematic structural diagram of the system chip of an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), and future 5G communication systems, etc.

[0051] The present application describes various embodiments in conjunction with terminal devices. Terminal devices may also refer to user equipment (UE), access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication devices, user agents, or user devices. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolving land public mobile communication network (PLMN) network, etc.

[0052] The present application describes various embodiments in conjunction with a network device. The network device may be a device for communicating with a terminal device, for example, a base station (Base Transceiver Station, BTS) in a GSM system or CDMA, a base station (NodeB, NB) in a WCDMA system, or an evolved base station (EvolutionalNode B, eNB or eNodeB) in an LTE system, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network side device in a future 5G network, or a network side device in a future evolved PLMN network, etc.

[0053] Figure 1 It is a schematic diagram of an application scenario of an embodiment of the present application. Figure 1 The communication system in the embodiment may include a network device 10 and a terminal device 20. The network device 10 is used to provide communication services for the terminal device 20 and access the core network. The terminal device 20 can access the network by searching for synchronization signals, broadcast signals, etc. sent by the network device 10, thereby communicating with the network. Figure 1 The arrows shown in may represent uplink / downlink transmissions performed via a cellular link between the terminal device 20 and the network device 10 .

[0054] Figure 1 The network device 10 in the embodiment may be, for example, an access network device or a core network device, wherein the access network device may include a primary access network device or a secondary access network device, the primary access network device may be, for example, a macro cell, and the secondary access network device may be, for example, a microcell, a picocell, or a femtocell, but the embodiment of the present invention is not limited thereto. The core network device may be a mobility management entity (MME), a serving gateway (S-GW), or a packet data gateway (PDN Gateway, P-GW), etc., but the present application does not limit this.

[0055] For ease of understanding, the following will combine Figure 2 The network fallback process in a common LTE system is briefly described. The network fallback process may be, for example, circuit switch fallback (CSFB). Figure 2 As shown, the CSFB process includes some or all of the following steps:

[0056] In 201, when the terminal device makes a voice call, it will send an extend service request message to the Mobility Management Entity (MME). The message carries CSFB information, indicating that the terminal device initiates a voice service request for circuit switch domain (CS) fallback. The service type information element is used to indicate that the service type is an originating CSFB voice service. At the same time, the message carries the temporary mobile subscriber identity (TMSI) assigned to the terminal device by the CS domain during the joint attachment process. After that, the terminal device will fall back to the 2G network with the assistance of the base station.

[0057] In 202, the MME sends an Initial Context Setup Request message to the base station, including a CS Fallback Indicator message, which is used to inform the base station that the terminal equipment needs to fall back to the UMTS Terrestrial Radio Access Network (UTRAN) or the GSM / Enhanced Data Rate for GSM Evolution (EDGE) radio access network (GSM EDGE Radio Access Network, GERAN) due to the CSFB voice service.

[0058] In 203, the base station requires the terminal device to perform cell measurement and obtain the measurement report reported by the terminal device to determine the redirected target system cell. The terminal device then sends the specific wireless configuration information of the target system cell and releases the radio resource control (RRC) connection with the base station. The LTE network can obtain the broadcast information of the 2G target cell in advance through the wireless message management or radio access network information management (RIM) process, and fill the broadcast information of the 2G network into the RRC release (RRC Release) message and send it to the terminal device, saving the time for the terminal device to read the 2G broadcast information (about 1.83 seconds).

[0059] In 204, when the terminal device accesses the target system cell, it needs to initiate a CS domain service request to the target system cell. Here, the terminal device sends a CM Service Request message to the Mobile Switching Center (MSC) or the Visiting Location Register (VLR) to request CS domain services. If the CM service request message carries a caller ID and a Circuit Switch Mobile Originate (CSMO) ID, the Mobile Service Switching Center (MSC) records that this call is a CSFB call of mobile origin.

[0060] In 205, if the MSC Server to which the target system cell belongs is different from the MSC Server registered when the terminal device attaches to the Evolved Packet System (EPS) network, then when the MSC Server receives the CM service request of the terminal device, since it does not have the information of the terminal device, it can adopt an implicit location update process to accept the user's service request. If the MSC Server does not support implicit location update and the MSC Server does not have user data, the CM service request of the terminal device is rejected. If the MSC Server rejects the user's CM service request, it will cause the terminal device to initiate a location update process in the CS domain. The terminal device will send a location update request message, and the Additional Update Parameters (Additional Update Parameters) element in the location update request message will carry a CSMO identifier. If the identifier is valid, the MSC Server will record that this call is a CSFB call.

[0061] In 206, after completing the location update, the terminal device executes the voice call establishment process in the CS domain again.

[0062] In 207, after the call ends, the MSC Server sends a CLEAR_COMMAND to the base station controller (BaseStationControl, BSC) to which the caller falls back, and the message carries a CSFB Indication information element, instructing the base station controller to remove the air interface connection and instruct the terminal device to return to the LTE network. Alternatively, the MSC Server sends an IU release command (IU_RELEASE_COMMAND) to the radio network controller (Radio Network Controller, RNC) to which the caller falls back, which carries an End Of CSFB information element, instructing the RNC to remove the air interface connection and instruct the terminal device to return to the LTE network.

[0063] In 208, the MSC receives the CLEAR_COMPLETE message from the BSC or the IU_RELEASE_COMPLETE message from the RNC, indicating that the call is terminated and the A interface is disconnected. When the access side instructs the terminal device to reselect the network, it only carries the LTE frequency before the CSFB user's call, so that the CSFB terminal device can quickly return to LTE, which is called the FastReturn process (the user unreachable time can be shortened to 1-2 seconds).

[0064] It can be seen that in the existing CSFB process, when the terminal device needs to perform voice services, it will want to contact the core network, for example Figure 2 The MME in the LTE core initiates a voice service. If the current network does not support voice services, the core network will reject the service and issue a CSFB instruction to the terminal device, causing it to fall back to the 2G network. This will result in a longer call process and increase call latency.

[0065] An embodiment of the present application proposes a network fallback method. When a terminal device is unable to initiate a feature service in the current network, the access network device instructs the terminal device to initiate the specific service in other networks, so that the terminal device can initiate the specific service in other networks based on the instruction of the access network, thereby avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0066] Figure 3 It is a schematic flowchart of the network rollback method of an embodiment of the present application. Figure 3 The method shown can be executed by a terminal device, which can be, for example, Figure 1 The terminal device 20 shown in FIG. Figure 3 As shown, the network fallback method includes:

[0067] In 310, the terminal device receives indication information sent by the access network, where the indication information is used to indicate whether the first network supports a specific service to be executed by the terminal device.

[0068] In 320, if the indication information indicates that the first network does not support the specific service, the terminal device initiates the specific service in the second network.

[0069] Specifically, if the terminal device initiates a service request to the current network to request execution of a specific service, the access network may send indication information to the terminal device, and the indication information is used to indicate whether the first network supports the characteristic service to be executed by the terminal device. If the indication information indicates that the first network does not support the specific service, for example, the indication information may be a service rejection message for rejecting the service request, then the terminal device may initiate the specific service in another network, namely, the second network.

[0070] Therefore, when the terminal device is unable to initiate a feature service in the current network, the terminal device can initiate the specific service in other networks based on the instructions of the access network, avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0071] Optionally, the first network may be, for example, the access network, the core network to which the access network belongs, the public land mobile network (PLMN) to which the access network belongs, or a slice network that carries the specific service.

[0072] Optionally, the specific service can be Figure 2 The voice service mentioned in the specification may also be other services such as video service.

[0073] The access network device can determine whether the first network supports the specific service according to the indication of the core network; or, the access network device can actively initiate an inquiry to the core network to inquire whether the first network supports the specific service, so that the core network sends information indicating whether the first network supports the specific service to the access network device according to the inquiry message; or, the service supported by the first network can be pre-configured through operation and maintenance management (OM), and the access network device determines whether the first network supports the specific service according to the pre-configured information. After the access network determines whether the first network supports the specific service, it indicates it to the terminal device through the indication information.

[0074] Optionally, before 310, that is, before the terminal device receives the indication information sent by the access network, the method may further include: the terminal device sends a service request message to the access network, where the service request message is used to request to execute the specific service in the first network;

[0075] Among them, in 310, the terminal device receives the indication information sent by the access network, including: the terminal device receives the indication information sent by the access network according to the service request message.

[0076] Further, optionally, the terminal device sends a service request message to the access network, including: the terminal device sends an RRC connection establishment request message to the access network, and the RRC connection establishment request message carries the service request information; or the terminal device sends an RRC connection establishment completion message to the access network, and the RRC connection establishment completion message carries the service request information.

[0077] Further, optionally, the service request message carries a network identifier of the first network.

[0078] For example, the terminal device can communicate with access network 1, and access network 1 can communicate with core network 1, core network 2, and core network 3 at the same time. If the terminal device requests to initiate the specific service in core network 1, the terminal device sends a service request message to access network 1 and carries the identifier of the first network in which it requests to initiate the service, that is, the network identifier of core network 1. If the terminal device requests to initiate the specific service in core network 2, the terminal device sends a service request message to access network 1 and carries the network identifier of core network 2. If the terminal device requests to initiate the specific service in core network 3, the terminal device sends a service request message to access network 1 and carries the network identifier of core network 3.

[0079] Optionally, in 310, the terminal device receives indication information sent by the access network, including: the terminal device receives system information sent by the access network, and the system information carries the indication information.

[0080] In 320, if the indication information indicates that the first network does not support the specific service, the terminal device needs to determine a second network for initiating the specific service, thereby initiating the specific service in the second network. In the embodiment of the present application, the terminal device can determine the second network in the following two ways.

[0081] Method 1

[0082] Optionally, if the indication information indicates that the first network does not support the specific service, the indication information is also used to indicate the second network, wherein the terminal device initiates the specific service in the second network, including: the terminal device initiates the specific service in the second network indicated by the indication information.

[0083] That is to say, if the access network informs the terminal device that the first network does not support the specific service, it will also inform the terminal device of the second network that can initiate the specific service, for example, informing the terminal device of the identifier of the second network, so that the terminal device initiates the specific service in the second network indicated by the access network.

[0084] For example, the access network sends the indication information to the terminal device to indicate that the core network 1 does not support the specific service. Then the indication information can also carry the network identifier of the core network 2 that supports the specific service, so that the terminal device can initiate the specific service in the core network 2.

[0085] Method 2

[0086] Optionally, the terminal device initiates the specific service in the second network, including: the terminal device determines the second network among multiple networks, and initiates the specific service in the second network.

[0087] That is to say, the access network only informs the terminal device that the first network does not support the specific service, and the terminal device needs to search for other networks by itself, so as to initiate the specific service in the searched second network.

[0088] Optionally, if the indication information indicates that the first network does not support the specific service, then before the terminal device initiates the specific service in the second network, the method also includes: the terminal device receives an RRC connection release message sent by the access network; and the terminal device releases the RRC connection with the first network according to the RRC connection release message.

[0089] Specifically, the network fallback method of the embodiment of the present application can be applied to a terminal device in an idle state or a terminal device in a connected state. If the terminal device is in a connected state, then when the indication information indicates that the first network does not support the specific service, the terminal device needs to release the established RRC connection.

[0090] Figure 4 It is a schematic flowchart of the network rollback method of an embodiment of the present application. Figure 4 The method shown can be executed by an access network device, which can be, for example, Figure 1 The network device 10 shown in FIG. Figure 4 As shown, the network fallback method includes:

[0091] In 410, the access network device determines whether the first network supports the specific service to be executed by the terminal device.

[0092] In 420, the access network device sends indication information to the terminal device, where the indication information is used to indicate whether the first network supports the specific service, so that the terminal device can initiate the specific service in the second network when the first network does not support the specific service.

[0093] Specifically, if the first network does not support the characteristic service initiated by the terminal device, the access network device may send indication information to the terminal device to reject the characteristic service to be executed by the terminal device. The indication information may be, for example, a service rejection message for rejecting the service request, so that the terminal device may initiate the specific service in another network, namely, the second network.

[0094] Therefore, when the terminal device is unable to initiate a feature service in the current network, the access network device instructs the terminal device to initiate the specific service in other networks, so that the terminal device can initiate the specific service in other networks based on the instruction of the access network, thereby avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0095] Optionally, the first network includes the access network where the access network device is located, the core network to which the access network belongs, the public land mobile communication network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0096] Optionally, the specific service includes a voice service or a video service.

[0097] Optionally, the access network device determines whether the first network supports a specific service to be executed by the terminal device, including: the access network device receives information sent by the core network indicating whether the first network supports the specific service; or the access network device sends an inquiry message to the core network, and receives information sent by the core network according to the inquiry message indicating whether the first network supports the specific service; or the access network device determines whether the first network supports the specific service based on pre-configured information indicating whether the first network supports the specific service.

[0098] Specifically, the access network device can determine whether the first network supports the specific service based on the indication of the core network; or, the access network device can actively initiate an inquiry to the core network, asking whether the first network supports the specific service, so that the core network sends information indicating whether the first network supports the specific service to the access network device based on the inquiry message; or, the service supported by the first network can be pre-configured through operation and maintenance management (OM), and the access network device determines whether the first network supports the specific service based on the pre-configured information.

[0099] Optionally, before the access network device determines whether the first network supports the specific service to be executed by the terminal device, the method further includes: the access network device receiving a service request message sent by the terminal device, the service request message being used to request execution of the specific service in the first network;

[0100] The step of sending indication information by the access network device to the terminal device includes: the access network device sending the indication information to the terminal device according to the service request message.

[0101] Optionally, the access network device receives a service request message sent by the terminal device, including: the access network device receives a wireless network control RRC connection establishment request message sent by the terminal device, and the RRC connection establishment request message carries the service request information; or the access network device receives an RRC connection establishment completion message sent by the terminal device, and the RRC connection establishment completion message carries the service request information.

[0102] Optionally, the service request message carries a network identifier of the first network.

[0103] Optionally, the access network device sends indication information to the terminal device, including: the access network device sends system information to the terminal device, and the system information carries the indication information.

[0104] Optionally, if the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network, so that the terminal device initiates the specific service in the second network indicated by the indication information.

[0105] Optionally, if the access network device determines that the first network does not support the specific service, the method also includes: the access network device sends an RRC connection release message to the terminal device, so that the terminal device releases the RRC connection between the first network and the first network according to the RRC connection release message.

[0106] It should be understood that the specific details of the access network equipment during the network fallback process can be referred to the aforementioned Figure 3 For the sake of brevity, the relevant description of the terminal device is not repeated here.

[0107] It should also be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0108] Figure 5is a schematic block diagram of a terminal device 500 according to an embodiment of the present application. Figure 5 As shown, the terminal device 500 includes a transceiver unit 510, and the transceiver unit 510 is used to:

[0109] Receiving indication information sent by the access network, the indication information is used to indicate whether the first network supports the specific service to be executed by the terminal device;

[0110] If the indication information indicates that the first network does not support the specific service, the specific service is initiated in the second network.

[0111] Therefore, when the terminal device is unable to initiate a feature service in the current network, it can initiate the specific service in other networks based on the instructions of the access network, avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0112] Optionally, the first network includes the access network, the core network to which the access network belongs, the public land mobile communications network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0113] Optionally, the specific service includes a voice service or a video service.

[0114] Optionally, the transceiver unit 510 is further used to: send a service request message to the access network, where the service request message is used to request execution of the specific service in the first network; and receive the indication information sent by the access network according to the service request message.

[0115] Optionally, the transceiver unit 510 is specifically used to: send a wireless network control RRC connection establishment request message to the access network, the RRC connection establishment request message carrying the service request information; or send an RRC connection establishment completion message to the access network, the RRC connection establishment completion message carrying the service request information.

[0116] Optionally, the service request message carries a network identifier of the first network.

[0117] Optionally, the transceiver unit 510 is specifically used to: receive system information sent by the access network, and the system information carries the indication information.

[0118] Optionally, if the indication information indicates that the first network does not support the specific service, the indication information is also used to indicate the second network, wherein the transceiver unit 510 is specifically used to: initiate the specific service in the second network indicated by the indication information.

[0119] Optionally, the transceiver unit 510 is specifically configured to: determine the second network among multiple networks, and initiate the specific service in the second network.

[0120] Optionally, the transceiver unit 510 is further used to: receive an RRC connection release message sent by the access network; and release the RRC connection with the first network according to the RRC connection release message.

[0121] Figure 6 is a schematic block diagram of an access network device 600 according to an embodiment of the present application. Figure 6 As shown, the access network device 600 includes a determination unit 610 and a transceiver unit 620. Among them:

[0122] A determination unit 610, configured to determine whether the first network supports a specific service to be executed by the terminal device;

[0123] The transceiver unit 620 is used to send indication information to the terminal device, where the indication information is used to indicate whether the first network supports the specific service, so that the terminal device can initiate the specific service in the second network when the first network does not support the specific service.

[0124] Therefore, when the terminal device is unable to initiate a feature service in the current network, the access network device instructs the terminal device to initiate the specific service in other networks, so that the terminal device can initiate the specific service in other networks based on the instruction of the access network, thereby avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0125] Optionally, the first network includes the access network where the access network device is located, the core network to which the access network belongs, the public land mobile communication network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0126] Optionally, the specific service includes a voice service or a video service.

[0127] Optionally, the determination unit 610 is specifically used to: receive information sent by the core network through the transceiver unit 620 indicating whether the first network supports the specific service; or send an inquiry message to the core network through the transceiver unit 620, and receive information sent by the core network according to the inquiry message indicating whether the first network supports the specific service; or determine whether the first network supports the specific service based on pre-configured information indicating whether the first network supports the specific service.

[0128] Optionally, the transceiver unit 620 is further used to: receive a service request message sent by the terminal device, the service request message being used to request execution of the specific service in the first network; and send the indication information to the terminal device according to the service request message.

[0129] Optionally, the transceiver unit 620 is specifically used to: receive a wireless network control RRC connection establishment request message sent by the terminal device, the RRC connection establishment request message carrying the service request information; or receive an RRC connection establishment completion message sent by the terminal device, the RRC connection establishment completion message carrying the service request information.

[0130] Optionally, the service request message carries a network identifier of the first network.

[0131] Optionally, the transceiver unit 620 is specifically used to: send system information to the terminal device, and the system information carries the indication information.

[0132] Optionally, if the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network, so that the terminal device initiates the specific service in the second network indicated by the indication information.

[0133] Optionally, the transceiver unit 620 is further used to: send an RRC connection release message to the terminal device, so that the terminal device releases the RRC connection with the first network according to the RRC connection release message.

[0134] Figure 7 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application. Figure 7 As shown, the terminal device includes a processor 710, a transceiver 720 and a memory 730, wherein the processor 710, the transceiver 720 and the memory 730 communicate with each other through an internal connection path. The memory 730 is used to store instructions, and the processor 710 is used to execute the instructions stored in the memory 730 to control the transceiver 720 to receive or send signals. The transceiver 720 is used to:

[0135] Receiving indication information sent by the access network, the indication information is used to indicate whether the first network supports the specific service to be executed by the terminal device;

[0136] If the indication information indicates that the first network does not support the specific service, the specific service is initiated in the second network.

[0137] Therefore, when the terminal device is unable to initiate a feature service in the current network, it can initiate the specific service in other networks based on the instructions of the access network, avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0138] Optionally, the first network includes the access network, the core network to which the access network belongs, the public land mobile communications network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0139] Optionally, the specific service includes a voice service or a video service.

[0140] Optionally, the transceiver 720 is further used to: send a service request message to the access network, where the service request message is used to request execution of the specific service in the first network; and receive the indication information sent by the access network according to the service request message.

[0141] Optionally, the transceiver 720 is specifically used to: send a wireless network control RRC connection establishment request message to the access network, the RRC connection establishment request message carrying the service request information; or send an RRC connection establishment completion message to the access network, the RRC connection establishment completion message carrying the service request information.

[0142] Optionally, the service request message carries a network identifier of the first network.

[0143] Optionally, the transceiver 720 is specifically used to: receive system information sent by the access network, and the system information carries the indication information.

[0144] Optionally, if the indication information indicates that the first network does not support the specific service, the indication information is also used to indicate the second network, wherein the transceiver 720 is specifically used to: initiate the specific service in the second network indicated by the indication information.

[0145] Optionally, the transceiver 720 is specifically configured to: determine the second network among multiple networks, and initiate the specific service in the second network.

[0146] Optionally, the transceiver 720 is further used to: receive an RRC connection release message sent by the access network; and release the RRC connection with the first network according to the RRC connection release message.

[0147] It should be understood that in the embodiment of the present application, the processor 710 may be a central processing unit (CPU), and the processor 710 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0148] The memory 730 may include a read-only memory and a random access memory, and provides instructions and data to the processor 710. A portion of the memory 730 may also include a nonvolatile random access memory.

[0149] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor 710 or an instruction in the form of software. The steps of the positioning method disclosed in the embodiment of the present application can be directly embodied as a hardware processor, or a combination of hardware and software modules in the processor 710. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 730, and the processor 710 reads the information in the memory 730 and completes the steps of the above method in combination with its hardware. To avoid repetition, it is not described in detail here.

[0150] The terminal device 700 according to the embodiment of the present application may correspond to the terminal device used to execute the method 300 in the above-mentioned method 300, as well as the terminal device 500 according to the embodiment of the present application, and each unit or module in the terminal device 700 is respectively used to execute each action or processing process performed by the terminal device in the above-mentioned method 300. Here, in order to avoid redundancy, its detailed description is omitted.

[0151] Figure 8 8 is a schematic structural diagram of an access network device 800 according to an embodiment of the present application. Figure 8As shown, the access network device includes a processor 810, a transceiver 820 and a memory 830, wherein the processor 810, the transceiver 820 and the memory 830 communicate with each other through an internal connection path. The memory 830 is used to store instructions, and the processor 810 is used to execute the instructions stored in the memory 830 to control the transceiver 820 to receive or send signals. The processor 810 is used to:

[0152] Determining whether the first network supports a specific service to be performed by the terminal device;

[0153] The transceiver 820 is used to: send indication information to the terminal device, where the indication information is used to indicate whether the first network supports the specific service, so that the terminal device can initiate the specific service in the second network when the first network does not support the specific service.

[0154] Therefore, when the terminal device is unable to initiate a feature service in the current network, the access network device instructs the terminal device to initiate the specific service in other networks, so that the terminal device can initiate the specific service in other networks based on the instruction of the access network, thereby avoiding complex signaling interactions between the terminal device and the core network and reducing the delay of the network fallback process.

[0155] Optionally, the first network includes the access network where the access network device is located, the core network to which the access network belongs, the public land mobile communication network PLMN to which the access network belongs, or a slice network that carries the specific service.

[0156] Optionally, the specific service includes a voice service or a video service.

[0157] Optionally, the processor 810 is specifically used to: receive information sent by the core network through the transceiver 820 indicating whether the first network supports the specific service; or send an inquiry message to the core network through the transceiver 820, and receive information sent by the core network according to the inquiry message indicating whether the first network supports the specific service; or determine whether the first network supports the specific service based on pre-configured information indicating whether the first network supports the specific service.

[0158] Optionally, the transceiver 820 is further used to: receive a service request message sent by the terminal device, the service request message being used to request execution of the specific service in the first network; and send the indication information to the terminal device according to the service request message.

[0159] Optionally, the transceiver 820 is specifically used to: receive a wireless network control RRC connection establishment request message sent by the terminal device, the RRC connection establishment request message carrying the service request information; or receive an RRC connection establishment completion message sent by the terminal device, the RRC connection establishment completion message carrying the service request information.

[0160] Optionally, the service request message carries a network identifier of the first network.

[0161] Optionally, the transceiver 820 is specifically used to: send system information to the terminal device, and the system information carries the indication information.

[0162] Optionally, if the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network, so that the terminal device initiates the specific service in the second network indicated by the indication information.

[0163] Optionally, the transceiver 820 is further used to: send an RRC connection release message to the terminal device, so that the terminal device releases the RRC connection with the first network according to the RRC connection release message.

[0164] It should be understood that in the embodiment of the present application, the processor 810 may be a central processing unit (CPU), and the processor 810 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0165] The memory 830 may include a read-only memory and a random access memory, and provide instructions and data to the processor 810. A portion of the memory 830 may also include a non-volatile random access memory. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 810 or an instruction in the form of software. The steps of the positioning method disclosed in conjunction with the embodiment of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor 810. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 830, and the processor 810 reads the information in the memory 830 and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0166] The access network device 800 according to the embodiment of the present application may correspond to the access network device used to execute the method 300 in the above-mentioned method 400, and the access network device 600 according to the embodiment of the present application, and each unit or module in the access network device 800 is respectively used to execute each action or processing process performed by the access network device in the above-mentioned method 400. Here, in order to avoid redundancy, its detailed description is omitted.

[0167] Fig. 9 It is a schematic structural diagram of the system chip of an embodiment of the present application. Fig. 9 The system chip 900 includes an input interface 901, an output interface 902, at least one processor 903, and a memory 904. The input interface 901, the output interface 902, the processor 903, and the memory 904 are interconnected through an internal connection path. The processor 903 is used to execute the code in the memory 904.

[0168] Optionally, when the code is executed, the processor 903 may implement the method 300 executed by the terminal device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0169] Optionally, when the code is executed, the processor 903 may implement the method 400 executed by the access network device in the method embodiment. For the sake of brevity, it will not be described in detail here.

[0170] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0172] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0173] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0174] In addition, each functional unit in each embodiment of the present application may be integrated into one monitoring unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0175] If this function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or an access network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0176] The above are only specific implementation methods of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the embodiments of the present application, which should be included in the protection scope of the present application that is suitable for personal interests. Therefore, the protection scope of the embodiments of the present application should be based on the protection scope of the claims.

Claims

1. A network fallback method, characterized in that: The method comprises: The terminal device receives indication information sent by the access network device, where the indication information is used to indicate whether the first network supports a specific service to be executed by the terminal device, wherein the service supported by the first network is pre-configured in a manner of operation, maintenance and management, and whether the first network supports the specific service is determined by the access network device according to the pre-configuration information, and the pre-configuration information is used to indicate the service supported by the first network; If the indication information indicates that the first network does not support the specific service, the terminal device initiates the specific service in the second network.

2. The method according to claim 1, characterized in that The first network includes the access network where the access network device is located, the core network to which the access network belongs, the land public mobile communication network PLMN to which the access network belongs, or the slice network that carries the specific service.

3. The method according to claim 1 or 2, characterized in that: The specific service includes a voice service or a video service.

4. The method according to claim 1 or 2, characterized in that: Before the terminal device receives the indication information sent by the access network device, the method further includes: The terminal device sends a service request message to the access network device, where the service request message is used to request execution of the specific service in the first network; The terminal device receives the indication information sent by the access network device, including: The terminal device receives the indication information sent by the access network device according to the service request message.

5. The method according to claim 4, characterized in that The terminal device sends a service request message to the access network device, including: The terminal device sends a radio network control RRC connection establishment request message to the access network device, where the RRC connection establishment request message carries the service request information; or The terminal device sends an RRC connection establishment completion message to the access network device, and the RRC connection establishment completion message carries the service request information.

6. The method according to claim 4, characterized in that The service request message carries the network identifier of the first network.

7. The method according to claim 1 or 2, characterized in that: The terminal device receives indication information sent by the access network device, including: The terminal device receives system information sent by the access network device, and the system information carries the indication information.

8. The method according to claim 1 or 2, characterized in that: If the indication information indicates that the first network does not support the specific service, the indication information is also used to indicate the second network, The terminal device initiating the specific service in the second network includes: The terminal device initiates the specific service in the second network indicated by the indication information.

9. The method according to claim 1 or 2, characterized in that: The terminal device initiating the specific service in the second network includes: The terminal device determines the second network among multiple networks, and initiates the specific service in the second network.

10. The method according to claim 1 or 2, characterized in that: If the indication information indicates that the first network does not support the specific service, before the terminal device initiates the specific service in the second network, the method further includes: The terminal device receives an RRC connection release message sent by the access network device; The terminal device releases the RRC connection with the first network according to the RRC connection release message.

11. A network fallback method, characterized in that: The method comprises: The access network device determines whether the first network supports the specific service to be executed by the terminal device; The access network device sends indication information to the terminal device, where the indication information is used to indicate whether the first network supports the specific service, so that the terminal device initiates the specific service in the second network when the first network does not support the specific service. The service supported by the first network is pre-configured by means of operation, maintenance and management, and the access network device determines whether the first network supports a specific service to be executed by the terminal device, including: The access network device determines whether the first network supports the specific service according to pre-configuration information, where the pre-configuration information is used to indicate the service supported by the first network.

12. The method according to claim 11, characterized in that The first network includes the access network where the access network device is located, the core network to which the access network belongs, the land public mobile communication network PLMN to which the access network belongs, or the slice network that carries the specific service.

13. The method according to claim 11 or 12, characterized in that: The specific service includes a voice service or a video service.

14. The method according to claim 11 or 12, characterized in that: Before the access network device determines whether the first network supports the specific service to be executed by the terminal device, the method further includes: The access network device receives a service request message sent by the terminal device, where the service request message is used to request execution of the specific service in the first network; The access network device sending indication information to the terminal device includes: The access network device sends the indication information to the terminal device according to the service request message.

15. The method according to claim 14, characterized in that The access network device receives the service request message sent by the terminal device, including: The access network device receives a radio network control RRC connection establishment request message sent by the terminal device, where the RRC connection establishment request message carries the service request information; or The access network device receives an RRC connection establishment completion message sent by the terminal device, and the RRC connection establishment completion message carries the service request information.

16. The method according to claim 14, characterized in that The service request message carries the network identifier of the first network.

17. The method according to claim 11 or 12, characterized in that: The access network device sends indication information to the terminal device, including: The access network device sends system information to the terminal device, and the system information carries the indication information.

18. The method according to claim 11 or 12, characterized in that: If the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network, so that the terminal device initiates the specific service in the second network indicated by the indication information.

19. The method according to claim 11 or 12, characterized in that: If the access network device determines that the first network does not support the specific service, the method further includes: The access network device sends an RRC connection release message to the terminal device, so that the terminal device releases the RRC connection between the terminal device and the first network according to the RRC connection release message.

20. A terminal device, characterized in that: The terminal device comprises: a transceiver unit, configured to receive indication information sent by an access network device, the indication information being used to indicate whether the first network supports a specific service to be executed by the terminal device, wherein the service supported by the first network is pre-configured by means of operation, maintenance and management, and whether the first network supports the specific service is determined by the access network device according to the pre-configuration information, and the pre-configuration information is used to indicate the service supported by the first network; The transceiver unit is further configured to initiate the specific service in the second network if the indication information indicates that the first network does not support the specific service.

21. The terminal device according to claim 20, characterized in that: The first network includes the access network where the access network device is located, the core network to which the access network belongs, the land public mobile communication network PLMN to which the access network belongs, or the slice network that carries the specific service.

22. The terminal device according to claim 20 or 21, characterized in that: The specific service includes a voice service or a video service.

23. The terminal device according to claim 20 or 21, characterized in that: The transceiver unit is also used for: Sending a service request message to the access network device, where the service request message is used to request execution of the specific service in the first network; Receive the indication information sent by the access network device according to the service request message.

24. The terminal device according to claim 23, characterized in that: The transceiver unit is specifically used for: Sending a radio network control RRC connection establishment request message to the access network device, wherein the RRC connection establishment request message carries the service request information; or Send an RRC connection establishment completion message to the access network device, where the RRC connection establishment completion message carries the service request information.

25. The terminal device according to claim 23, characterized in that: The service request message carries the network identifier of the first network.

26. The terminal device according to claim 20 or 21, characterized in that: The transceiver unit is specifically used for: Receive system information sent by the access network device, where the system information carries the indication information.

27. The terminal device according to claim 20 or 21, characterized in that: If the indication information indicates that the first network does not support the specific service, the indication information is also used to indicate the second network, The transceiver unit is specifically used for: The specific service is initiated in the second network indicated by the indication information.

28. The terminal device according to claim 20 or 21, characterized in that: The transceiver unit is specifically: The second network is determined among a plurality of networks, and the specific service is initiated in the second network.

29. The terminal device according to claim 20 or 21, characterized in that: The transceiver unit is also used for: Receiving an RRC connection release message sent by the access network device; According to the RRC connection release message, the RRC connection with the first network is released.

30. An access network device, characterized in that: The access network equipment includes: A determination unit, configured to determine whether the first network supports a specific service to be executed by the terminal device; a transceiver unit, configured to send indication information to the terminal device, wherein the indication information is used to indicate whether the first network supports the specific service, so that the terminal device initiates the specific service in the second network when the first network does not support the specific service, The services supported by the first network are pre-configured through operation, maintenance and management, and the determining unit is specifically used to determine whether the first network supports the specific service according to the pre-configuration information, and the pre-configuration information is used to indicate the services supported by the first network.

31. The access network device according to claim 30, characterized in that: The first network includes the access network where the access network device is located, the core network to which the access network belongs, the land public mobile communication network PLMN to which the access network belongs, or the slice network that carries the specific service.

32. The access network device according to claim 30 or 31, characterized in that: The specific service includes a voice service or a video service.

33. The access network device according to claim 30 or 31, characterized in that: The transceiver unit is also used for: receiving a service request message sent by the terminal device, where the service request message is used to request execution of the specific service in the first network; The indication information is sent to the terminal device according to the service request message.

34. The access network device according to claim 33, characterized in that: The transceiver unit is specifically used for: receiving a radio network control RRC connection establishment request message sent by the terminal device, wherein the RRC connection establishment request message carries the service request information; or Receive an RRC connection establishment completion message sent by the terminal device, wherein the RRC connection establishment completion message carries the service request information.

35. The access network device according to claim 33, characterized in that: The service request message carries the network identifier of the first network.

36. The access network device according to claim 30 or 31, characterized in that: The transceiver unit is specifically used for: Sending system information to the terminal device, wherein the system information carries the indication information.

37. The access network device according to claim 30 or 31, characterized in that: If the access network device determines that the first network does not support the specific service, the indication information is also used to indicate the second network, so that the terminal device initiates the specific service in the second network indicated by the indication information.

38. The access network device according to claim 30 or 31, characterized in that: The transceiver unit is also used for: An RRC connection release message is sent to the terminal device so that the terminal device releases the RRC connection with the first network according to the RRC connection release message.

39. A terminal device, characterized in that: The terminal device comprises: a processor, a transceiver and a memory; wherein, The processor, the transceiver and the memory communicate with each other via an internal connection path; The memory is used to store instructions that can be executed on the processor; The processor is configured to execute instructions stored in the memory to control the transceiver to receive or send signals, so as to perform the method according to any one of claims 1 to 10.

40. An access network device, characterized in that: The access network device comprises: a processor, a memory and a transceiver; wherein, The processor, the transceiver and the memory communicate with each other via an internal connection path; The memory is used to store instructions that can be executed on the processor; The processor is configured to execute instructions stored in the memory to control the transceiver to receive or send signals, so as to perform the method according to any one of claims 11 to 19.

41. A computer storage medium storing a computer readable program, wherein the computer readable program, when executed by at least one processor, implements the method according to any one of claims 1 to 10 or any one of claims 11 to 19.

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