CN110856229A - Network switching method, device and communication system - Google Patents
Network switching method, device and communication system Download PDFInfo
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- CN110856229A CN110856229A CN201911150291.1A CN201911150291A CN110856229A CN 110856229 A CN110856229 A CN 110856229A CN 201911150291 A CN201911150291 A CN 201911150291A CN 110856229 A CN110856229 A CN 110856229A
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The application discloses a network switching method, a network switching device and a communication system, relates to the technical field of communication, and is used for reducing the switching time of a terminal from a 5G network to a 3G network. The method comprises the following steps: the terminal receives a first message from network equipment, wherein the first message is used for indicating the terminal to carry out network switching; the terminal executes a network switching process; and under the condition that the network switching process fails, if the first message comprises a first identifier, the terminal is connected with the 3G network, and the first identifier is used for indicating that the network is switched to the SRVCC switching of the single standby wireless voice call continuity from the 5G network to the 3G network.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a network switching method, an apparatus, and a communication system.
Background
In wireless communication networks, voice call services are very important services. In the initial stage of establishing the 5th generation (5G) network, the 5G network may have a situation that some areas are not covered, and at this time, the terminal needs to search for the 4G network and try to establish a connection. In some cases, the 4G network does not support the voice call service, and therefore the terminal needs to initiate a circuit switched fallback (CS fallback) procedure to the 3G network. Through the series of network switching processes, the voice call service of the terminal cannot be normally performed for a long time, thereby reducing the user experience.
Disclosure of Invention
The embodiment of the application provides a network switching method, a network switching device and a communication system, which are used for reducing the network switching time of a terminal from a 5G network to a 3G network.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, a network handover method is provided, which is applied to a terminal, and includes: after the terminal receives a first message which is from the network equipment and used for indicating the terminal to carry out network switching, the terminal executes a network switching process. Under the condition that the terminal network switching process fails, if the first message comprises a first identifier, and the first identifier is used for indicating that the network is switched to SRVCC switching from a 5G network to a 3G network, the terminal is connected with the 3G network.
Based on the above method, in this application, when the network device confirms that the terminal needs to perform network handover, the network device sends a network handover instruction (i.e. the first message in the foregoing) to the terminal, where the network handover instruction includes an identifier (i.e. the first identifier in the foregoing) for indicating that the network is handed over to SRVCC handover from a 5G network to a 3G network. And after receiving the network switching instruction, the terminal executes network switching. In case of the terminal failing to perform the network handover, the terminal may determine that the network handover failure is an SRVCC handover failure from the 5G network to the 3G network according to the first identifier. In this way, the terminal can directly search for the 3G network and initiate a call setup procedure on the 3G network after the search is successful. Therefore, the terminal does not need to be connected with the 4G network first and then fall back to the 3G network. The terminal directly establishes connection with the 3G network, and the process of network switching is shortened. Therefore, the terminal can reduce the interruption time of the voice call service, thereby improving the user experience.
In a second aspect, a network handover method is provided, which is applied to a network device, and includes: the network equipment confirms that the terminal needs to carry out network switching; the network equipment sends a first message to the terminal, wherein the first message is used for indicating the terminal to perform network switching, the first message comprises a first identifier, and the first identifier is used for indicating that the network is switched to SRVCC switching from a 5G network to a 3G network.
In a third aspect, a network switching apparatus is provided, the apparatus including:
a communication unit for receiving a first message from a network device; the first request message is used for indicating the terminal to carry out network switching. And the processing unit is used for executing network switching. And the consuming unit is further configured to, under the condition that the network handover procedure fails, connect to the 3G network if the first message includes the first identifier, where the first identifier is used to indicate that the network is handed over to SRVCC handover from the 5G network to the 3G network.
In a fourth aspect, a network switching apparatus is provided, including:
and the processing unit is used for confirming that the terminal needs to carry out network switching. And the communication unit is used for sending a first message to the terminal, wherein the first message is used for indicating the terminal to perform network switching, the first message comprises a first identifier, and the first identifier is used for indicating the network switching to SRVCC switching from the 5G network to the 3G network.
In a fifth aspect, a communication system is provided, which includes a terminal and a network device. The terminal is configured to execute the network handover method according to the first aspect, and the network device is configured to execute the network handover method according to the second aspect.
In a sixth aspect, a computer-readable storage medium is provided, having stored therein instructions that, when executed, implement the network handover method of the first or second aspect.
In a seventh aspect, a computer program product is provided, which contains at least one instruction, when the instruction is executed on a computer, the instruction causes the computer to execute the network switching method according to the first aspect or the second aspect.
In an eighth aspect, a chip is provided, where the chip includes at least one processor and a communication interface, the communication interface is coupled to the at least one processor, and the at least one processor is configured to execute a computer program or instructions to implement the network switching method of the first aspect or the second aspect.
Any one of the above-mentioned apparatuses, computer storage media, or computer program products is configured to execute the above-mentioned corresponding method, so that the beneficial effects achieved by the apparatuses, the computer storage media, or the computer program products can refer to the beneficial effects of the corresponding schemes in the above-mentioned corresponding methods, and are not described herein again.
Drawings
Fig. 1 is a schematic diagram of an application scenario of Single Radio Voice Call Continuity (SRVCC) handover from a 5G network to a 3G network according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a handover procedure of SRVCC from a 5G network to a 3G network according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a network handover method according to an embodiment of the present application;
fig. 5 is a flowchart illustrating another network handover method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a network switching apparatus according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another network switching apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another network switching device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a chip according to an embodiment of the present application.
Detailed Description
In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. For example, the first message and the second message are only used for distinguishing different messages, and the sequence order of the messages is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.
The following briefly introduces some concepts related to embodiments of the present application.
1. New air interface voice (Voice over new radio, VoNR)
The VoNR scheme is a voice call solution based on 5G network access, and can realize that the voice service and the data service of the terminal are both carried by the 5G network.
2、VOLTE
A Voice Over Long Term Evolution (VOLTE) is a high-speed wireless communication standard for mobile phones and data terminals.
3. SRVCC handover from 5G network to3G network
As shown in fig. 1, fig. 1 illustrates an application scenario of SRVCC handover from a 5G network to a 3G network. SRVCC handover from a 5G network to a 3G network means that when a terminal performs a voice service through VoNR, the terminal moves to a location where there is no 5G network or where the 5G network has poor signal quality, and when a 4G network does not support the voice service (i.e., the 4G network does not support VOLTE), the terminal needs to connect to the 3G network to ensure that the terminal performs the voice service normally.
As shown in fig. 2, the SRVCC handover procedure from the 5G network to the 3G network includes: 1. the terminal sends a Measurement Report (MR) to a 5g access network (NG-RAN); 2. after receiving the MR, the NG-RAN sends a message for switching to an evolved Universal Terrestrial Radio Access Network (UTRAN) due to the need of 5G-SRVCC to an access and mobility management function (AMF); 3. after receiving the message, the AMF performs indirect5G-SRVCC (initiates index 5G-SRVCC for voice component) initiation for the voice component through interaction with a mobility management entity (MME-Server) and a Mobile Switching Center (MSC Server); 4. the MSC Server starts a Circuit Switched (CS) handover preparation by interaction with the target UTRAN; initiating an IMS service Continuity procedure (IMSService Continuity) through interaction with a target UTRAN, an IP Multimedia System (IMS); 5. the MSC Server sends a response (CS response to intermediate MME) of the CS to the MME-SRVCC; 6. after receiving the response from the MSC Server, the MME-SRVCC sends a Packet Switch (PS) handover response (PS HO response) to the AMF; 7. after receiving a network switching response from MME-SRVCC, AMF sends a handover command (HO CMD) to the terminal through NG-RAN; 8. and after receiving the handover command, the terminal executes the handover.
The above is an introduction to the terminology referred to in the present application and will not be described in detail below.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating an architecture of a communication system according to an embodiment of the present application. The communication system includes a terminal 100 and a network device 200.
In this embodiment, the terminal 100 is configured to send a network handover request to a network device. The terminal may be referred to by different names, such as User Equipment (UE), access terminal, terminal unit, terminal station, mobile station, remote terminal, mobile device, wireless communication device, vehicular user equipment, terminal agent or terminal device, and the like. Optionally, the terminal may be various handheld devices, vehicle-mounted devices, wearable devices, and computers with communication functions, which is not limited in this embodiment of the present application. For example, the handheld device may be a smartphone. The in-vehicle device may be an in-vehicle navigation system. The wearable device may be a smart bracelet. The computer may be a Personal Digital Assistant (PDA) computer, a tablet computer, and a laptop computer.
The network device 200 is configured to receive a network handover request from the terminal 100 and transmit a network handover command to the terminal 100.
It should be noted that the system architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. In the embodiment of the present application, the method provided is applied to an NR system or a 5G network as an example.
As shown in fig. 4, an embodiment of the present application provides a network handover method, where the method includes:
step 101, a terminal receives a first message from a network device.
The first message is used for indicating that the terminal needs to perform network switching.
Illustratively, the first message may be a mobilityfrmnrcommand message.
And 102, the terminal executes a network switching process.
It should be appreciated that the terminal may perform the network handover procedure upon receiving the first message. The network handover process is shown in fig. 2, and is not described herein again.
And 103, under the condition that the switching of the terminal network fails, if the first message comprises the first identifier, connecting the terminal with the 3G network.
It should be noted that, in the embodiment of the present application, the failure of the terminal network handover includes the following situations:
1. the terminal has not successfully established a connection with a target Radio Access Technology (RAT).
2. The terminal cannot perform the configuration contained in the first message.
3. There is a protocol error in the network handover information contained in the first message, resulting in a terminal being unable to perform procedures according to specifications applicable to the target RAT.
Wherein the first identifier is used for indicating that the network is switched to SRVCC switching from the 5G network to the 3G network.
Illustratively, the first identifier may be SrvccTo 3G. That is, the MobilityFromNRCommand message has the following structure:
it should be noted that the mobilityfrmnrcommand message in the prior art is as follows:
in this embodiment, after the terminal fails to execute the network handover procedure, the terminal may execute a process of reestablishing an RRC connection re-establishment (RRC connection re-establishment). If the first message comprises the first identifier, the terminal can directly search the 3G network and initiate the establishment of the voice service process, and the terminal does not need to be connected with the 4G network first and then falls back to the 3G network from the 4G network. Therefore, the terminal can reduce the interruption time of the voice service and improve the user experience.
It should be noted that, in the case that the first message does not include the first identifier, the terminal cannot determine whether the network handover is caused by SRVCCC from the 5G network to the 3G network or caused by other reasons. The network handover caused by other reasons may be that the terminal needs to be handed over to the 3G network because the terminal is located at a position without 4G network coverage, or the terminal needs to be handed over to the 3G network because of an algorithm of a network device.
In a possible embodiment, based on the technical solution of fig. 4, as shown in fig. 5, before step 101, the network handover method provided in the embodiment of the present application may further include:
and step 104, the terminal sends a second message to the network equipment. Accordingly, the network device receives the second message from the terminal.
The second message is used for indicating that the terminal needs to perform network handover, and the second message includes a measurement report MR.
It should be understood that, in the embodiment of the present application, when the terminal performs the voice service through the 5G network, if the terminal moves to a position where there is no 5G network or the 5G network has poor signal quality, and cannot satisfy the voice service of the terminal, the terminal needs to perform network switching. That is, the terminal needs to perform SRVCC handover from the 5G network to the 3G network.
And 105, the network equipment determines that the terminal needs to perform network switching.
According to a possible implementation manner, the network device determines that the terminal needs to perform network switching according to the second message. In this embodiment of the application, the network device may determine, according to the MR in the second message, that the 5G network where the terminal is located cannot support the voice service of the terminal, that is, the terminal needs to perform SRVCC handover from the 5G network to the 3G network. In the case where it is determined that the terminal needs to perform an SRVCC handover from the 5G network to the 3G network, the network device may generate a first message including the first identity.
Step 106, the network device sends a first message to the terminal.
In the embodiment of the present application, the network switching device may be divided into the functional modules or the functional units according to the above method examples, for example, each functional module or functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module may be implemented in a form of hardware, or may be implemented in a form of a software functional module or a functional unit. The division of the modules or units in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
The embodiment of the application provides a network switching device, which is applied to a terminal and can also be a chip applied to the terminal. As shown in fig. 6, the network switching apparatus may include:
a communication unit 601, configured to receive a first message from a network device, where the first message is used to instruct a terminal to perform network handover.
A processing unit 602, configured to execute a network handover procedure.
The processing unit 602 is further configured to, under the condition that the network handover procedure fails, connect to the 3G network if the first message includes the first identifier, where the first identifier is used to indicate that the network is handed over to SRVCC handover from the 5G network to the 3G network.
Optionally, the network handover procedure failure includes the following cases:
the terminal has not successfully established a connection with the target radio access technology, RAT; or, the terminal cannot execute the configuration information contained in the first message; or, there is a protocol error in the network handover information contained in the first message.
Optionally, the communication unit 601 is further configured to send a second message to the network device, where the second message is used to indicate that the terminal needs to perform network handover. Wherein the second message comprises a measurement report MR.
An embodiment of the present application provides another network switching device, which is applied to a network device, and may also be a chip applied to the network device, as shown in fig. 7, the network switching device may include:
a processing unit 701, configured to determine that the terminal needs to perform network handover.
A communication unit 702, configured to send a first message to the terminal, where the first message is used to instruct the terminal to perform network handover, and the first message includes a first identifier, and the first identifier is used to instruct the network to handover from the 5G network to the SRVCC of the 3G network.
Optionally, the communication unit 702 is further configured to receive a second message from the terminal; the processing unit 702 is specifically configured to determine that the terminal needs to perform network handover according to the second message.
Optionally, the second message comprises a measurement report.
Fig. 8 shows a schematic diagram of another possible structure of the network switching device in the above embodiment. The network switching apparatus includes: one or more processors 181 and a communication interface 182. Processor 181 is used to control and manage the actions of the device, e.g., to perform the steps performed by processing unit 602 or processing unit 701 described above, and/or other processes for performing the techniques described herein.
In particular implementations, processor 181 may include one or more CPUs such as CPU0 and CPU1 of fig. 8 as an example.
In particular implementations, the communication device may include multiple processors, such as processor 181 of fig. 8, for example, as an embodiment. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
Optionally, the network switching device may further comprise a memory 183 and a communication line 184, the memory 183 being adapted to store program codes and data for the device.
Fig. 9 is a schematic structural diagram of a chip 190 according to an embodiment of the present disclosure. Chip 190 includes one or more (including two) processors 1910 and a communication interface 1930.
Optionally, the chip 190 also includes a memory 1940, which may include both read-only memory and random access memory, and provides operating instructions and data to the processor 1910. A portion of the memory 1940 may also include non-volatile random access memory (NVRAM).
In some embodiments, memory 1940 stores elements, execution modules, or data structures, or a subset thereof, or an expanded set thereof.
In the embodiment of the present application, by calling an operation instruction stored in the memory 1940 (the operation instruction may be stored in an operating system), a corresponding operation is performed.
The processor 1910 may implement or execute the various illustrative logical blocks, units, and circuits described in connection with the disclosure herein. The processor may be a central processing unit, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, units, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others.
The bus 1920 may be an Extended Industry Standard Architecture (EISA) bus or the like. The bus 1920 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one line is shown in FIG. 9, but this does not represent only one bus or one type of bus.
It is clear to those skilled in the art from the foregoing description of the embodiments that, for convenience and simplicity of description, the foregoing division of the functional units is merely used as an example, and in practical applications, the above function distribution may be performed by different functional units according to needs, that is, the internal structure of the device may be divided into different functional units to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
The embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by a computer, the computer executes each step in the method flow shown in the above method embodiment.
The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, and a hard disk. Random Access Memory (RAM), Read-Only Memory (ROM), Erasable Programmable Read-Only Memory (EPROM), registers, a hard disk, an optical fiber, a portable Compact disk Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium, in any suitable combination, or as appropriate in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuit (ASIC). In embodiments of the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
Embodiments of the present invention provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method as described in fig. 4, 5.
Since the network switching device, the computer-readable storage medium, and the computer program product in the embodiments of the present invention may be applied to the method described above, reference may also be made to the method embodiments for obtaining technical effects, and details of the embodiments of the present invention are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. A network switching method is applied to a terminal, and the method comprises the following steps:
the terminal receives a first message from network equipment, wherein the first message is used for indicating the terminal to carry out network switching;
the terminal executes a network switching process;
and under the condition that the network switching process fails, if the first message comprises a first identifier, the terminal is connected with the 3G network, and the first identifier is used for indicating that the network is switched to the SRVCC switching of the single standby wireless voice call continuity from the 5G network to the 3G network.
2. The network handover method of claim 1, wherein the network handover procedure failure comprises:
the terminal has not successfully established a connection with a target radio access technology, RAT; or,
the terminal cannot execute the configuration information contained in the first message; or,
a protocol error exists in the network handover information contained in the first message.
3. The network handover method according to claim 1 or 2, wherein before the terminal receives the first message from the network device, the method further comprises:
and the terminal sends a second message to the network equipment, wherein the second message is used for indicating that the terminal needs to carry out network switching.
4. A network switching method is applied to a network device, and comprises the following steps:
the network equipment determines that the terminal needs to perform network switching;
the network equipment sends a first message to a terminal, wherein the first message comprises a first identifier; the first message is used for indicating the terminal to perform network switching, and the first identifier is used for indicating the network switching to SRVCC switching from a 5G network to a 3G network.
5. The network handover method according to claim 4, wherein the network device determining that the terminal needs to perform network handover comprises:
the network equipment receives a second message from the terminal;
and the network equipment determines that the terminal needs to carry out network switching according to the second message.
6. A network switching device is applied to a terminal, and comprises:
a communication unit, configured to receive a first message from a network device, where the first message is used to instruct the terminal to perform network handover;
the processing unit is used for executing a network switching process;
the processing unit is further configured to connect to the 3G network if the first message includes a first identifier under the condition that the network handover procedure fails, where the first identifier is used to indicate that the network is handed over to SRVCC handover from the 5G network to the 3G network.
7. The network switching apparatus of claim 6, wherein the network switching procedure failure comprises:
the terminal has not successfully established a connection with a target radio access technology, RAT;
or,
the terminal cannot execute the configuration information contained in the first message;
or,
a protocol error exists in the network handover information contained in the first message.
8. The network switching apparatus according to claim 6 or 7,
the communication unit is further configured to send a second message to the network device, where the second message is used to indicate that the terminal needs to perform network handover.
9. A network switching device is applied to a network device, and comprises:
the processing unit is used for determining that the terminal needs to perform network switching;
a communication unit, configured to send a first message to the terminal, where the first message is used to instruct the terminal to perform network handover, and the first message includes a first identifier, where the first identifier is used to instruct the network to handover to SRVCC from a 5G network to a 3G network.
10. The network switching apparatus of claim 9,
the communication unit is further used for receiving a second message from the terminal;
the processing unit is specifically configured to determine that the terminal needs to perform network handover according to the second message.
11. A communication system, comprising: a terminal for performing the network handover method of any one of claims 1 to3, and a network device for performing the network handover method of any one of claims 4 to 5.
12. A computer-readable storage medium having stored therein instructions that, when executed, implement the network handover method of any one of claims 1-3 or the network handover method of any one of claims 4-5.
13. A chip comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to execute a computer program or instructions to implement the network switching method according to any one of claims 1 to3 or to implement the network switching method according to any one of claims 4 to 5.
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