WO2022120602A1

WO2022120602A1 - Voice fallback method, terminal device, and network device

Info

Publication number: WO2022120602A1
Application number: PCT/CN2020/134677
Authority: WO
Inventors: 程严; 夏利民; 孙林
Original assignee: 华为技术有限公司
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-06-16

Abstract

Provided in the present application are a voice fallback method, a terminal, and a network device, so that when a terminal device falls back from a high-version access network to a low-version access network for a voice service, latency established by the voice service is reduced, and user experience is improved. The method comprises: a base station acquires first information, the first information being used for indicating whether a first wireless access network supports a bearer voice corresponding to a standard of the first wireless access network, and the base station being a base station of the first wireless access network; and the base station sends the first information.

Description

A method, terminal device and network device for voice fallback

technical field

The present application relates to the field of communications, and, more particularly, to a voice fallback method, terminal device and network device.

Background technique

With the development of communication technology, in some areas with traffic hotspots, different versions of radio access networks coexist. When accessing a service that is not supported by the network, the terminal device needs to perform voice fallback to a cell of a radio access network with a lower version to perform the service. Currently, there is a problem of a long voice establishment time during voice fallback.

For example, 3GPP defines two schemes for 5G new radio (NR) networking, which are independent networking (standalone, SA) and non-standalone (non-standalone, NSA). For the 5G independent networking mode, 3GPP proposes two solutions: voice over new radio (VoNR) and evolved packet system (EPS) fallback. In the EPS fallback scheme, as shown in Figure 1, the terminal equipment needs to access the 5G network first. When performing voice services, it needs to fall back to the 4G network, and establish a long-term evolution voice bearer (voice over long-term) through the 4G access network and the core network. term evolution, VoLTE) voice service. At present, the voice establishment time of the terminal equipment in the EPS fallback solution is long, which greatly affects the user's voice connection experience. Therefore, how to reduce the EPS fallback voice access delay has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a method for voice fallback, which enables a terminal device to realize fast voice fallback.

A first aspect provides a method for voice fallback, the method comprising: a base station acquiring first information, where the first information is used to indicate whether a first radio access network supports communication with the first radio access network The base station is a base station of the first radio access network; the base station sends the first information.

In this embodiment of the present application, acquiring the first information by the base station may mean that the base station generates the first information or the base station acquires the first information, which is not limited in this application. In addition, the bearer voice corresponding to the standard of the first radio access network refers to the bearer voice technology corresponding to the version of the first radio access network, for example, the first radio access network is the fifth generation 5G When accessing the network, the bearer voice is 5G VoNR, and when the first radio access network is the fourth-generation 4G access network, the bearer voice is Long Term Evolution bearer voice LTE VoNR. Taking the first radio access network as the 5G core network as an example, the base station can inform the terminal equipment residing or accessing the 5G core network in advance of the 5G core network supported by the base station by sending the first information to indicate whether the 5G core network supports 5G VoNR. Voice capability, so that the terminal device can judge whether it needs to fall back to the 4G network when it needs to perform voice services according to the voice capabilities supported by the network side. When it needs to fall back to the 4G network, it can quickly access the 4G network without requiring terminal equipment Processes such as registration, establishment of core network voice bearer between base station and core network, and establishment of core network voice bearer rejection, reduce the delay of voice establishment.

With reference to the first aspect, in some implementation manners of the first aspect, the sending, by the base station, the first information includes: the base station sending the first information in a broadcast manner.

Optionally, the base station may send the first information through system information.

With reference to the first aspect, in some implementations of the first aspect, sending the first information by the base station includes: establishing a radio resource control RRC connection between the base station and a terminal device, and the terminal device resides in the A terminal device of a first radio access network; the base station sends the first information to the terminal device through the RRC connection.

Optionally, the base station may send the first information through paging information.

With reference to the first aspect, in some implementations of the first aspect, the method includes: identifying, by the base station, that an access purpose of the terminal device is a voice service, and the first information indicates a first radio access network The bearer voice is not supported or the indication information received by the base station from the terminal device indicates that the terminal device does not support the bearer voice, the base station sends second information to the terminal device, and the second information is used to instruct to release the RRC connection.

In the embodiment of the present application, taking the first radio access network as a 5G access network as an example, when the 5G access network does not support 5G VoNR or the terminal device does not support 5G VoNR, the base station releases the RRC connection in advance, Processes such as establishing a core network voice bearer and establishing a core network voice bearer rejection between the base station and the core network are not required, which reduces the delay of voice establishment.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the base station sends third information to the terminal device, where the third information is used to indicate the access point of the terminal device. Information about the second radio access network, the version of the second radio access network is lower than the version of the first radio access network.

Optionally, the third information may be handover or redirection information.

With reference to the first aspect, in some implementations of the first aspect, identifying, by the base station, that the access purpose of the terminal device is a voice service includes:

The base station identifies that the access purpose of the terminal device is a voice service according to first identification information, where the first identification information includes:

A temporary mobile subscriber identity S-TMSI, the S-TMSI is allocated to the terminal device after the base station voice paging to the terminal device or received by the base station from the terminal device; or

Service subscription information SPID of the terminal device.

In a second aspect, a method for voice fallback is provided, the method comprising: a terminal device receiving first information, where the first information is used to indicate whether a first radio access network supports communication with the first radio access network bearer voice corresponding to the standard; the terminal device determines whether the first radio access network supports the bearer voice according to the first information.

In this embodiment of the present application, the voice bearer corresponding to the standard of the first radio access network refers to the voice bearer technology corresponding to the version of the first radio access network. For example, the first radio access network is the first radio access network. When the fifth-generation 5G access network is used, the bearer voice is 5G VoNR, and when the first radio access network is the fourth-generation 4G access network, the bearer voice is the long-term evolution bearer voice LTE VoNR.

With reference to the second aspect, in some implementations of the second aspect, the first information indicates that the first radio access network does not support the bearer voice, and the method further includes: the terminal device initiates 2. Measurement of the radio access network, wherein the version of the first radio access network is higher than the version of the second radio access network; when the measurement result satisfies the preset condition, the terminal device passes the The second radio access network performs voice services.

In the embodiment of this application, taking the first radio access network as a 5G core network as an example, the terminal device determines according to the first information that the 5G access network does not support 5G VoNR or that the terminal device only supports EPS fallback, and the terminal device can initiate For the measurement of the 4G access network, when the voice service is required, it directly falls back to the 4G access network, and does not require the terminal equipment to perform network registration, establish the core network voice bearer between the base station and the core network, and reject the establishment of the core network voice bearer. and other processes; or after the base station and the terminal device release the RRC connection, it can immediately fall back to the 4G access network; or before the 5G core network sends the establishment of voice bearer information, the base station sends measurement control information to the terminal device in advance, and the terminal device receives the After the information is obtained, the measurement for the 4G access network is initiated. At this time, the terminal device measures the 4G access network and the 5G core network and sends the establishment of voice bearer information to the base station and the base station sends the establishment of voice bearer rejection information to the 5G core network. At the same time, in order to quickly fall back To the 4G access network, the delay of voice establishment is reduced.

With reference to the second aspect, in some implementation manners of the second aspect, the first information is carried in broadcast information or radio resource control RRC information.

With reference to the second aspect, in some implementations of the second aspect, before the terminal device performs a voice service through the second wireless access network, the method further includes: the terminal device receives second information, And according to the second information to identify the need to perform the voice service, the second information is used to indicate that the terminal device needs to access the voice service as the called party.

With reference to the second aspect, in some implementations of the second aspect, the second information is carried in paging information.

In a third aspect, a network device for voice fallback is provided, the network device includes: a receiving unit configured to receive first information, where the first information is used to indicate whether the first radio access network supports the the bearer voice corresponding to the standard of the first wireless access network, the network device is a network device of the first wireless access network; the sending unit is configured to send the first information.

In this embodiment of the present application, the voice bearer corresponding to the standard of the first radio access network refers to the voice bearer technology corresponding to the version of the first radio access network. For example, the first radio access network is the first radio access network. When the fifth-generation 5G access network is used, the bearer voice is 5G VoNR, and when the first radio access network is the fourth-generation 4G access network, the bearer voice is the long-term evolution bearer voice LTE VoNR. Taking the first radio access network as the 5G core network as an example, the network device can inform the terminal equipment residing or accessing the 5G core network in advance that the core network supports the 5G VoNR by sending the first information to indicate whether the 5G core network supports 5G VoNR. so that the terminal device can judge whether it needs to fall back to the 4G network when it needs to perform voice services according to the voice capabilities supported by the network side. When it needs to fall back to the 4G network, it can quickly access the 4G network without the need for terminal equipment. Processes such as network registration, establishment of core network voice bearer between base station and core network, and establishment of core network voice bearer rejection, reduce the delay of voice establishment.

With reference to the third aspect, in some implementation manners of the third aspect, the sending unit configured to send the first information includes: the sending unit sends the first information by broadcasting.

Optionally, the sending unit may send the first information through system information.

With reference to the third aspect, in some implementations of the third aspect, the sending unit, configured to send the first information includes: the network device establishes a radio resource control RRC connection with a terminal device, and the terminal device is A terminal device residing in the first radio access network; the sending unit sends the first information to the terminal device through the RRC connection.

Optionally, the sending unit may send the first information through paging information.

With reference to the third aspect, in some implementations of the third aspect, a processing unit is further included, the processing unit is configured to identify that the access purpose of the terminal device is a voice service, and the sending unit includes: the first The information indicates that the first wireless access network does not support the bearer voice or the indication information received by the network device from the terminal device indicates that the terminal device does not support the bearer voice, and the sending unit sends the bearer voice to the terminal device the second information, where the second information is used to indicate the release of the RRC connection.

In the embodiment of the present application, taking the first radio access network as a 5G access network as an example, when the 5G access network does not support 5G VoNR or the terminal device does not support 5G VoNR, the network device releases the RRC connection in advance , the process of establishing core network voice bearer and establishing core network voice bearer rejection between network equipment and core network is not required, which reduces the delay of voice establishment.

With reference to the third aspect, in some implementations of the third aspect, the sending unit further includes: sending third information to the terminal device, where the third information is used to indicate the second information accessed by the terminal device Information about the radio access network, the version of the second radio access network is lower than the version of the first radio access network.

Optionally, the third information may be handover or redirection information.

With reference to the third aspect, in some implementations of the third aspect, the identifying that the access purpose of the terminal device is a voice service includes: the processing unit identifying the access purpose of the terminal device according to the first identification information It is a voice service, and the first identification information includes: a temporary mobile subscriber identity S-TMSI, the S-TMSI is allocated to the terminal device after the network device voice paging to the terminal device or the network device The device receives from the terminal device; or the service subscription information SPID of the terminal device.

In a fourth aspect, a terminal device is provided, the terminal device includes: a receiving unit, where the receiving unit is configured to receive first information, where the first information is used to indicate whether the first wireless access network supports communication with the bearer voice corresponding to the standard of the first radio access network; and a processing unit, where the processing unit is configured to determine whether the first radio access network supports the bearer voice according to the first information.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first information indicates that the first radio access network does not support the bearer voice, and the processing unit further includes: the processing unit initiates Measurement of the second radio access network, wherein the version of the first radio access network is higher than the version of the second radio access network; when the measurement result satisfies the preset condition, the terminal device The voice service is performed through the second radio access network.

In the embodiment of this application, taking the first radio access network as a 5G core network as an example, the terminal device determines according to the first information that the 5G access network does not support 5G VoNR or that the terminal device only supports EPS fallback, and the terminal device can initiate For the measurement of the 4G access network, when the voice service is required, it directly falls back to the 4G access network, and does not require the terminal equipment to perform network registration, establish the core network voice bearer between the network equipment and the core network, and establish the core network voice bearer. Rejection and other processes; or after the network device and the terminal device release the RRC connection, it can fall back to the 4G access network immediately; or before the 5G core network sends the establishment of voice bearer information, the network device sends measurement control information to the terminal device in advance, and the terminal device After receiving this information, the measurement for the 4G access network is initiated. At this time, the terminal device measures the 4G access network and the 5G core network and sends the establishment voice bearer information to the network device and the network device sends the establishment voice bearer rejection information to the 5G core network at the same time. , so that it can quickly fall back to the 4G access network and reduce the delay of voice establishment.

With reference to the fourth aspect, in some implementations of the fourth aspect, the first information is carried in broadcast information or radio resource control RRC information.

In a fifth aspect, a computer-readable storage medium is provided, and a computer program is stored on the computer-readable storage medium, and when the computer program runs, the apparatus is made to perform the first aspect or any one of the first aspects. Instructions for implementing the method in the possible implementation manner, or instructions for causing the apparatus to execute the method in the second aspect or any of the possible implementation manners of the second aspect.

In a sixth aspect, a chip system is provided, comprising: a processor for calling and running a computer program from a memory, so that a communication device installed with the chip system executes the first aspect or any one of the first aspects The method in a possible implementation manner; or causing a communication device installed with the chip system to execute the method in the second aspect or any of the possible implementation manners of the second aspect.

In a seventh aspect, a communication system is provided, including: a network device for executing the method in the first aspect or any possible implementation manner of the first aspect; a terminal device for executing the second aspect or The method in any possible implementation manner of the second aspect.

In an eighth aspect, an apparatus for wireless communication is provided, comprising: a method for implementing the above-mentioned first aspect or any possible implementation manner of the first aspect; or a method for implementing the above-mentioned second aspect or the second aspect method in any of the possible implementations.

In a ninth aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is run by a network device, the network device is made to perform the above-mentioned first aspect or the first aspect method in any of the possible implementations.

In a tenth aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed by a terminal device, the terminal device is made to execute the second aspect or the second aspect above method in any of the possible implementations.

According to the solution of this embodiment of the present application, by delivering the voice capability information supported by the network side, the base station can enable the terminal equipment residing on the access network of the higher version to know the voice capabilities supported by the network side in advance, and fall back to the access network of the lower version in advance When accessing the network for voice services, quickly access the 4G network, reducing the delay in establishing voice services and improving user experience.

Description of drawings

Figure 1 is a schematic interaction diagram of the EPS fallback scheme.

FIG. 2 is a schematic interaction diagram of an example of the speech fallback method of the present application.

FIG. 3 is a schematic interaction diagram of another example of the speech fallback method of the present application.

FIG. 4 is a schematic interaction diagram of yet another example of the speech fallback method of the present application.

FIG. 5 is a schematic block diagram of an example of a terminal device according to an embodiment of the present application.

FIG. 6 is a schematic block diagram of an example of a network device according to an embodiment of the present application.

FIG. 7 is a schematic block diagram of another example of a terminal device according to an embodiment of the present application.

FIG. 8 is a schematic block diagram of another example of a network device according to an embodiment of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The methods of the embodiments of the present application may be applied to a long term evolution (long term evolution, LTE) system, a long term evolution advanced (long term evolution-advanced, LTE-A) system, an enhanced long term evolution (enhanced long term evolution-advanced) system , eLTE), the fifth generation (the 5th Generation, 5G) mobile communication system new radio (new radio, NR) system, can also be extended to similar wireless communication systems, such as wireless fidelity (wireless-fidelity, WiFi), Worldwide interoperability for microwave access (WIMAX), future 6th generation (6G) systems, and 3rd generation partnership project (3gpp) related cellular systems.

In this embodiment of the present application, a network device is a device deployed in a wireless access network to provide a wireless communication function for a terminal device. The network equipment may include various forms of base stations, macro base stations, micro base stations (also called small cells), relay stations, access points, etc., or various network element equipment in a core network (core network, CN). In systems using different radio access technologies, the names of devices with base station functions may vary. For example, a network device may be an access point (AP) in a wireless local area network (WLAN), or a global system for mobile communication (GSM) or code division multiple access (CDMA). code division multiple access, CDMA) in the base station (base transceiver station, BTS). It may also be a node B (5G nodeB, gNB) in a 5G system or an evolved node B (evolved nodeB, eNB or eNodeB) in an LTE system. Alternatively, the network device may also be a Node B (Node B) of the third generation (3rd generation, 3G) system, and in addition, the network device may also be a relay station or an access point, or a vehicle-mounted device, a wearable device, and a fifth-generation A network device in a communication (fifth-generation, 5G) network or a network device in a future evolved public land mobile network (public land mobile network, PLMN) network, etc.

The terminal equipment in the embodiments of the present application may also be referred to as user equipment (user equipment, UE), access terminal, terminal equipment unit (subscriber unit), terminal equipment station, mobile station, mobile station (mobile station, MS), A remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, terminal device proxy or terminal device device. Terminal devices may include various wireless communication capable handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. May also include subscriber units, cellular phones, smart phones, wireless data cards, personal digital assistant (PDA) computers, tablet computers, wireless modems, handheld devices ), laptop computer (laptop computer), machine type communication (MTC) terminal, station (station, ST) in wireless local area networks (WLAN). Can be cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, and next-generation communication systems, such as terminal equipment in 5G networks or future evolved Terminal equipment in the PLMN network, etc.

For convenience of description, this application takes UE, gNB, CN, and eNB as examples to describe the EPS fallback method. It should be understood that the embodiments of the speech fallback method of the present application are not limited to the EPS fallback scheme.

Optionally, in S210, UE#A establishes an NR RRC connection with gNB#A.

In S211, gNB#A obtains the voice capability information supported by the network side, where the voice capability information supported by the network side includes information on whether the network side supports the VoNR capability.

In S220, gNB#A sends the voice capability information supported by the network side to UE#A, and UE#A receives the voice capability information supported by the network side.

In a possible implementation manner, the voice capability information supported by the network side is carried in a system message delivered by gNB#A.

In a possible implementation manner, when UE#A establishes an NR RRC connection with gNB#A, the voice capability information supported by the network side is carried in the RRC information.

In S230, UE#A identifies that voice service is required.

UE#A recognizes that voice services are required. As an example and not a limitation, the following methods can be used:

Manner 1, when UE#A actively initiates a voice service, UE#A identifies that voice service needs to be performed according to notification information of an application that needs to perform a voice service.

Method 2: When UE#A needs to access voice services as the called party, gNB#A sends information #A to UE#A, and the information #A is used to indicate that UE#A needs to access voice services as the called party. Optional Alternatively, the information #A may be carried in the paging information.

In S240, UE#A determines whether it needs to access the eNB to perform the voice service according to the voice capability supported by the network side. Wherein, when the network side does not support the VoNR voice capability, UE#A determines that it needs to access the eNB for voice service.

Optionally, in S250, UE#A determines that it needs to access the eNB to perform the voice service according to the fact that it only supports the EPS fallback voice capability. At this time, it may not acquire the voice capability information supported by the network side.

In S260, UE#A determines one or more eNBs that can be accessed through measurement.

In a possible implementation manner, UE#A may start to measure one or more eNBs that can be accessed before UE#A identifies that the voice service needs to be performed in S230.

Optionally, in S270, after UE#A establishes the NR RRC connection with gNB#A, gNB#A releases the NR RRC connection established with UE#A.

In S280, UE#A selects an eNB#A with better network conditions to access according to one or more eNBs, and establishes a voice service.

In S310, UE#A establishes an NR RRC connection with gNB#A.

In S311, gNB#A obtains the voice capability information supported by the network side, where the voice capability information supported by the network side includes information on whether the network side supports the VoNR capability.

Optionally, in S320, UE#A reports its own voice capability information to gNB#A, where the voice capability information includes whether to support the VoNR voice capability, or only support the EPS fallback voice capability.

In S330, gNB#A identifies that the access purpose of UE#A is the voice service.

The identification methods of gNB#A, as an example and not a limitation, include the following:

method one

gNB#A identifies that the access purpose of UE#A is the voice service according to the access reason value reported by UE#A.

Method 2

gNB#A identifies that the purpose of UE#A's access is the voice service according to the Serving-Temporary Mobile Subscriber Identity (S-TMSI) assigned to UE#A after voice paging or the S-TMSI reported by UE#A .

way three

gNB#A identifies that the purpose of UE#A's access is the voice service according to the service provider profile identifiers (SPID) of UE#A.

Optionally, in S331, UE#A immediately initiates measurement of accessible eNBs after identifying that the voice service is required.

The identification method of UE#A has been described in the above-mentioned embodiment, and will not be repeated here.

In S340, gNB#A determines whether UE#A needs to access the eNB according to the voice capability supported by the network side (or according to the voice capability supported by UE#A), when the network side does not support VoNR (or UE#A does not support VoNR) , judging that UE#A needs to access the eNB.

In S350, gNB#A sends information #B to UE#A, the information #B is used to instruct gNB#A to release the NR RRC connection with UE#A, optionally, the information #B also includes handover or redirection information, UE#A receives this information.

In S360, UE#A determines one or more eNBs that can be accessed through measurement.

In S370, UE#A selects an eNB#A with better network conditions to access according to one or more eNBs, and establishes a voice service.

In S410, UE#A establishes an NR RRC connection with gNB#A.

In S420, UE#A performs network registration and other configurations with gNB#A and CN#A, including non-access stratum (Non-Access Stratum, NAS) authentication, encryption, and UE#A capability query.

In S421, gNB#A obtains the voice capability information supported by the network side, where the voice capability information supported by the network side includes information on whether the network side supports the VoNR capability.

Optionally, in S422, UE#A reports its own voice capability information to gNB#A, where the voice capability information includes whether to support the VoNR voice capability, or only support the EPS fallback voice capability.

In S430, gNB#A identifies that the access purpose of UE#A is the voice service.

The identification method of gNB#A has been described in the above-mentioned embodiment, and will not be repeated here.

In S431, gNB#A judges whether UE#A needs to access the eNB according to the voice capability supported by the network side (or according to the voice capability supported by UE#A), when the network side does not support VoNR (or UE#A does not support VoNR) , judging that UE#A needs to access the eNB.

In S440, gNB#A sends measurement control information to UE#A, where the measurement control information is used to instruct UE#A to measure accessible eNBs, and UE#A receives the information.

In S450, CN#A sends information of establishing a voice bearer to gNB#A to establish a voice service with UE#A, and gNB#A receives the information.

In S460, gNB#A sends CN#A the message of rejecting the establishment of the voice bearer, and CN#A receives the message.

In S470, UE#A sends measurement report information to gNB#A, where the measurement report information includes eNBs that UE#A can access, and gNB#A receives the information.

In S480, gNB#A sends handover or redirection information to UE#A, and UE#A receives the information.

In S490, gNB#A releases the NR RRC connection established with UE#A.

In S4100, UE#A selects an eNB#A with better network conditions to access according to one or more eNBs, and establishes a voice service.

The method for determining the transmission direction according to the embodiment of the present application is described above with reference to FIG. 2 to FIG. 4 , and the device according to the embodiment of the present application is described below with reference to FIG. 5 to FIG. 8 .

FIG. 5 is a schematic block diagram of an example of a terminal device according to an embodiment of the present application. As shown in FIG. 5, the terminal device 500 includes:

a receiving unit 510, configured to receive first information, where the first information is used to indicate whether the first radio access network supports bearer voice corresponding to the standard of the first radio access network;

A processing unit 520, where the processing unit is configured to determine, according to the first information, whether the first radio access network supports the bearer voice.

When the first information indicates that the first radio access network does not support the bearer voice, the processing unit initiates measurement for the second radio access network, where the version of the first radio access network is higher. in the version of the second radio access network;

When the measurement result satisfies the preset condition, the terminal device performs the voice service through the second wireless access network.

Optionally, the first information is carried in broadcast information or radio resource control RRC information.

FIG. 6 is a schematic block diagram of an example of a network device according to an embodiment of the present application. As shown in FIG. 6, the network device 600 includes:

The receiving unit 610 is configured to receive first information, where the first information is used to indicate whether the first wireless access network supports bearer voice corresponding to the standard of the first wireless access network, and the network device is the network equipment of the first radio access network;

a processing unit 620, configured to identify that the access purpose of the UE is a voice service;

A sending unit 630, configured to send the first information.

In a possible implementation manner, the sending unit 630 sends the first information by broadcasting.

Optionally, the sending unit 630 sends the first information through system information.

In a possible implementation manner, the network device 600 establishes a radio resource control RRC connection with a user equipment UE, the UE is a UE residing in the first radio access network, and the sending unit 630 uses the The RRC connection sends the first information to the UE.

Optionally, the sending unit 630 sends the first information through paging information.

In a possible implementation manner, when the UE needs to access a voice service, and the first information indicates that the first radio access network does not support the bearer voice, or the receiving unit 610 receives from the UE The indication information indicates that the UE does not support the bearer voice, and the sending unit 630 sends second information to the UE, where the second information is used to indicate the release of the RRC connection.

In a possible implementation manner, the sending unit 630 sends third information to the UE, where the third information is used to indicate information of a second radio access network accessed by the UE, the second information The version of the radio access network is lower than the version of the first radio access network.

In a possible implementation manner, the processing unit identifies, according to first identification information, that the access purpose of the UE is a voice service, and the first identification information includes:

a temporary mobile subscriber identity S-TMSI, where the S-TMSI is allocated to the UE after the network device voice paging to the UE or received by the network device from the UE; or

Service subscription information SPID of the UE.

FIG. 7 is a schematic block diagram of another example of a terminal device according to an embodiment of the present application. As shown in FIG. 7 , the terminal device 700 includes a transceiver 710 and a processor 720 . The processor 720 is configured to support the terminal device to perform the corresponding functions of the terminal device in the above method. Optionally, the terminal device 700 may further include a memory 730 , where the memory 730 is configured to be coupled with the processor 720 and store necessary program instructions and data of the terminal device 700 . The processor 720 is specifically configured to execute the instructions stored in the memory 730, and when the instructions are executed, the terminal device executes the method performed by the terminal device in the above methods.

It should be noted that the terminal device 500 shown in FIG. 5 may be implemented by the terminal device 700 shown in FIG. 7 . For example, the receiving unit 510 shown in FIG. 5 may be implemented by the transceiver 710 , and the processing unit 520 may be implemented by the processor 720 .

FIG. 8 is a schematic block diagram of another example of a network device according to an embodiment of the present application. As shown in FIG. 8 , the network device 800 includes a transceiver 810 and a processor 820, and the processor 820 is configured to support the network device to perform the corresponding functions of the network device in the above method. Optionally, the network device may further include a memory 830, where the memory 830 is coupled to the processor 820 and stores necessary program instructions and data of the network device. The processor 820 is specifically configured to execute the instructions stored in the memory 830, and when the instructions are executed, the network device executes the method performed by the network device in the foregoing method.

It should be noted that the network device 600 shown in FIG. 6 may be implemented by the network device 800 shown in FIG. 8 . For example, the receiving unit 610 and the transmitting unit 630 shown in FIG. 6 may be implemented by the transceiver 810 , and the processing unit 620 may be implemented by the processor 820 .

It should be noted that this application takes terminal equipment and network equipment as examples to describe a method and equipment for voice fallback according to the embodiments of this application. It should be understood that the voice fallback method in the embodiment of the present application may also be implemented by two baseband chips, and the first baseband chip in the two baseband chips is used to implement the related operations of the terminal device in the embodiment of the present application. The second baseband chip in the baseband chip is used to implement related operations of the network device in the embodiments of the present application.

It should also be noted that the input/output circuit of the first baseband chip can be used to implement the related operations of the transceiver of the terminal device above, and the input/output circuit of the second baseband chip can be used to implement the transceiver of the above network device. machine-related operations.

It should be understood that, in this embodiment of the present application, the processor may be a central processing unit (central processing unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), dedicated integrated Circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

It should also be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (DRAM) Access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory Fetch memory (synchlink DRAM, SLDRAM) and direct memory bus random access memory (direct rambus RAM, DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server or data center by wire (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that contains one or more sets of available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, digital versatile disc (DVD)), or semiconductor media. The semiconductor medium may be a solid state drive.

It should be understood that the term "and/or" in this document is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

Those of ordinary skill in the art can realize 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. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

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

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution, and the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method for voice fallback, characterized in that the method comprises:

The base station acquires first information, where the first information is used to indicate whether the first radio access network supports bearer voice corresponding to the standard of the first radio access network, and the base station is the first radio access network base station;

The base station sends the first information.
The method of claim 1, wherein sending the first information by the base station comprises:

The base station sends the first information by broadcasting.
The method of claim 1, wherein sending the first information by the base station comprises:

establishing, by the base station, a radio resource control RRC connection with a terminal device, where the terminal device is a terminal device residing in the first radio access network;

The base station sends the first information to the terminal device through the RRC connection.
The method of claim 3, wherein the method comprises:

The base station identifies that the access purpose of the terminal equipment is a voice service, and the first information indicates that the first wireless access network does not support the bearer voice or the indication information received by the base station from the terminal equipment indicates that the If the terminal device does not support the bearer voice, the base station sends second information to the terminal device, where the second information is used to instruct to release the RRC connection.
The method of claim 4, wherein the method further comprises:

The base station sends third information to the terminal device, where the third information is used to indicate the information of the second radio access network accessed by the terminal device, and the version of the second radio access network is lower than that of the terminal device. The version of the first radio access network described above.
The method according to claim 4 or 5, wherein the identification by the base station that the access purpose of the terminal equipment is a voice service comprises:

The base station identifies that the access purpose of the terminal device is a voice service according to first identification information, where the first identification information includes:

A temporary mobile subscriber identity S-TMSI, the S-TMSI is allocated to the terminal device after the base station voice paging to the terminal device or received by the base station from the terminal device; or

Service subscription information SPID of the terminal device.
A method for voice fallback, characterized in that the method comprises:

The terminal device receives first information, where the first information is used to indicate whether the first radio access network supports bearer voice corresponding to the standard of the first radio access network;

The terminal device determines, according to the first information, whether the first radio access network supports the bearer voice.
The method of claim 7, wherein the first information indicates that the first radio access network does not support the bearer voice, the method further comprising:

The terminal device initiates a measurement for a second radio access network, wherein the version of the first radio access network is higher than the version of the second radio access network;

When the measurement result satisfies the preset condition, the terminal device performs the voice service through the second wireless access network.
The method according to claim 7 or 8, wherein the first information is carried in broadcast information or RRC information.
The method according to claim 8, wherein before the terminal device performs a voice service through the second wireless access network, the method further comprises:

The terminal device receives the second information, and identifies according to the second information that a voice service needs to be performed, where the second information is used to indicate that the terminal device needs to access the voice service as a called party.
The method of claim 10, wherein the second information is carried in paging information.
A network device for voice fallback, characterized in that the network device includes:

a receiving unit, the receiving unit is configured to receive first information, where the first information is used to indicate whether the first radio access network supports bearer voice corresponding to the standard of the first radio access network, and the network device is a network device of the first wireless access network;

a sending unit, where the sending unit is configured to send the first information.
The network device according to claim 12, wherein the sending unit, configured to send the first information, comprises:

The sending unit sends the first information by broadcasting.
The network device according to claim 12, wherein the sending unit, configured to send the first information, comprises:

establishing, by the network device, a radio resource control RRC connection with a terminal device, where the terminal device is a terminal device residing in the first radio access network;

The sending unit sends the first information to the terminal device through the RRC connection.
The network device according to claim 14, further comprising a processing unit, wherein the processing unit is configured to identify that the access purpose of the terminal device is a voice service, and the sending unit comprises:

The first information indicates that the first wireless access network does not support the bearer voice or the indication information received by the network device from the terminal device indicates that the terminal device does not support the bearer voice, and the sending unit sends a message to the The terminal device sends second information, where the second information is used to indicate the release of the RRC connection.
The network device according to claim 15, wherein the sending unit further comprises:

Sending third information to the terminal device, where the third information is used to indicate information of a second radio access network accessed by the terminal device, where the version of the second radio access network is lower than that of the first radio access network Radio access network version.
The network device according to claim 15 or 16, wherein the identifying that the access purpose of the terminal device is a voice service comprises:

The processing unit identifies that the access purpose of the terminal device is a voice service according to the first identification information, and the first identification information includes:

a temporary mobile subscriber identity S-TMSI, where the S-TMSI is allocated to the terminal device after the network device voice paging to the terminal device or received by the network device from the terminal device; or

Service subscription information SPID of the terminal device.
A terminal device, characterized in that the terminal device includes:

a receiving unit, where the receiving unit is configured to receive first information, where the first information is used to indicate whether the first radio access network supports bearer voice corresponding to the standard of the first radio access network;

a processing unit, where the processing unit is configured to determine, according to the first information, whether the first radio access network supports the bearer voice.
The terminal device of claim 18, wherein the first information indicates that the first radio access network does not support the bearer voice, and the processing unit further comprises:

the processing unit initiates a measurement for a second radio access network, wherein the version of the first radio access network is higher than the version of the second radio access network;

When the measurement result satisfies the preset condition, the terminal device performs the voice service through the second wireless access network.
The terminal device according to claim 18 or 19, wherein the first information is carried in broadcast information or radio resource control RRC information.
A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program runs,

causing the apparatus to perform the method of any one of claims 1 to 6, or

The apparatus is caused to perform a method as claimed in any one of claims 7 to 11.
A chip system is characterized by comprising: a processor for calling and running a computer program from a memory,

causing a communication device mounted with the chip system to perform the method of any one of claims 1 to 6; or

A communication device mounted with the chip system is caused to perform the method according to any one of claims 7 to 11 .
A communication system, comprising:

A network device for performing the method according to any one of claims 1 to 6;

A terminal device for performing the method according to any one of claims 7 to 11.
A device for wireless communication, comprising:

A unit for implementing the method of any one of claims 1 to 6; or

A unit for implementing the method of any one of claims 7 to 11.
A computer program product comprising: computer program code which, when executed by a network device, causes the network device to perform the method according to any one of claims 1 to 6.
A computer program product, the computer program product comprising: computer program code, which when the computer program code is executed by a terminal device, causes the terminal device to execute the method according to any one of claims 7 to 11.