CN116801330A - Voice service implementation method and device, terminal and network side equipment - Google Patents

Abstract

The application discloses a voice service realization method, a device, a terminal and network side equipment, belonging to the wireless communication field, the voice service realization method of the embodiment of the application comprises the following steps: after a terminal residing in a first network acquires a target instruction, triggering network reselection to a second network; and the terminal executes voice service in the second network.

Description

Voice service implementation method, device, terminal and network side equipment

Technical field

This application belongs to the field of wireless communication technology, and specifically relates to a voice service implementation method, device, terminal and network side equipment.

Background technique

After the fifth generation (5G) network is commercially deployed, it may be possible to use the fourth generation (4G) LTE-based voice service (Voice over LTE, VoLTE) service to undertake the calling and called voice services initiated by 5G terminals. Scenes. For example, in the early stages of 5G network commercialization, some operators may not directly deploy 5G voice services, but use 4G VoLTE services to maximize the use of existing network resources; or, 5G networks generally have small high-frequency coverage, and a certain number of If there is no 5G NR network coverage in the area, 4G LTE coverage is also needed to continue the voice service; or the 5G network capacity is limited and when the 5G network load is high, the operator also hopes to transfer the user's 5G voice service to the 4G network trigger and execute.

In the above scenario, there is a terminal that initially registers in the first network (for example, 5G network) and performs related data services, but can fall back to the second network (for example, when it needs to perform voice services (including calling or called)). 4G network) to trigger and execute the voice service requirements. In response to this demand, there is currently no quick and effective solution.

Contents of the invention

Embodiments of the present application provide a voice service implementation method, device, terminal and network side equipment, which can solve the problem of how a terminal residing in the first network can quickly fall back to the second network to perform voice services.

In a first aspect, a voice service implementation method is provided, including: after a terminal residing in a first network obtains a target indication, triggering network reselection to a second network; the terminal performs a voice service on the second network .

In a second aspect, a voice service implementation device is provided, including: a triggering module, configured to trigger a terminal to perform network reselection to a second network after obtaining a target indication, wherein the terminal resides on the first network; execute Module configured to perform voice services on the second network.

In a third aspect, a paging method is provided, including: a network side device receiving a NAS message sent by a terminal, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has support for carrying The capability of the paging message of the first indication information, the first indication information includes at least one of the following: an indication of fallback to the second network, an indication of the network side supporting fallback from the first network to the second network; the network side The device sends a paging message to the terminal, where the paging message carries first indication information.

In a fourth aspect, a paging device and a receiving module are provided, configured to receive a NAS message sent by a terminal, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has support for carrying The capability of the paging message of the first indication information, the first indication information including at least one of the following: an indication of fallback to the second network, an indication that the network side supports fallback from the first network to the second network; the second sending module , used to send a paging message to the terminal, wherein the paging message carries first indication information.

In a fifth aspect, a terminal is provided. The terminal includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. When the program or instructions are executed by the processor, the following implementations are implemented: The steps of the method described in one aspect.

A sixth aspect provides a terminal, including a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the first aspect, and the communication interface is used to communicate with an external device.

In a seventh aspect, a network side device is provided. The network side device includes a processor and a memory. The memory stores programs or instructions that can be run on the processor. The program or instructions are executed by the processor. When implementing the steps of the method described in the third aspect.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the third aspect, and the communication interface is used to communicate with an external device.

In a ninth aspect, a voice service implementation system is provided, including: a terminal and a network side device. The terminal can be used to perform the steps of the method described in the first aspect, and the network side device can be used to perform the steps of the method described in the third aspect. steps of the method.

In a tenth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method are implemented as described in the first aspect. The steps of the method described in the third aspect.

In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the method described in the first aspect. The steps of a method, or steps of implementing a method as described in the third aspect.

In a twelfth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement as described in the first aspect The steps of the method, or the steps of implementing the method as described in the third aspect.

In this embodiment of the present application, after the terminal residing in the first network obtains the target indication, it triggers network reselection to the second network, and then performs voice services on the second network, so that the terminal residing in the first network can Fall back to the second network to perform voice services, and if the terminal is in an idle state, there is no need to first enter the connected state in the first network and then fall back to the second network, but directly perform network reselection, thereby shortening the time of the voice service. time delay.

Description of the drawings

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable;

Figure 2 shows a schematic flow chart of a terminal initially registered in the 5G network falling back to the 4G network to implement voice services;

Figure 3 shows a schematic flow chart of a voice service implementation method provided by an embodiment of the present application;

Figure 4 shows a flow chart of a paging method provided by an embodiment of the present application;

Figure 5 shows a schematic flow chart of a method for implementing a calling voice service in an embodiment of the present application;

Figure 6 shows a schematic flow chart of a method for implementing a called voice service provided by an embodiment of the present application;

Figure 7 shows a schematic structural diagram of a voice service implementation device provided by an embodiment of the present application;

Figure 8 shows a structural flow chart of a paging device provided by an embodiment of the present application;

Figure 9 shows a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 10 shows a schematic diagram of the hardware structure of a terminal provided by an embodiment of the present application;

Figure 11 shows a schematic hardware structure diagram of a network-side device provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this application.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and "second" are distinguished objects It is usually one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

It is worth pointing out that the technology described in the embodiments of this application is not limited to Long Term Evolution (Long Term Evolution, LTE)/LTE Evolution (LTE-Advanced, LTE-A) systems, and can also be used in other wireless communication systems, such as code division Multiple Access (Code Division Multiple Access, CDMA), Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) , Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably, and the described technology can be used not only for the above-mentioned systems and radio technologies, but also for other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these techniques can also be applied to applications other than NR system applications, such as ^6th Generation , 6G) communication system.

Figure 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer ( ultra-mobile personalcomputer (UMPC), mobile Internet Device (MID), augmented reality (AR)/virtual reality (VR) equipment, robots, wearable devices (WearableDevice), vehicle-mounted equipment ( VUE), pedestrian terminal (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (PC), teller machines or self-service machines and other terminal sides Equipment, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, Smart clothing, etc. It should be noted that the embodiment of the present application does not limit the specific type of the terminal 11. The network side device 12 may include an access network device and/or a core network device, where the access network device 12 may also be called a radio access network device, a radio access network (Radio Access Network, RAN), or a radio access network. function or radio access network unit. The access network device 12 may include a base station, a WLAN access point or a WiFi node, etc. The base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (BTS), a radio Base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B, Home Evolved Node B, Transmitting Receiving Point (TRP) or in the above mentioned fields Other suitable terms can be used as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only the base station in the NR system is used as an example for introduction, and the base station is not limited. specific type. Core network equipment may include but is not limited to at least one of the following: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions ( Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Service Discovery Function (Edge ApplicationServer Discovery Function, EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (Centralized network configuration, CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (Local NEF, or L-NEF), Binding Support Function (BSF), Application Function (Application Function, AF), etc. It should be noted that in the embodiment of this application, only the core network equipment in the NR system is used as an example for introduction, and the specific type of the core network equipment is not limited.

For terminals that exist in some scenarios, they initially register on the 5G network and perform relevant data services, but when they need to perform voice services (including calling or called), they can fall back to the 4G network to trigger and perform the voice services. , Figure 2 shows a possible solution, which enables the 5G UE to fall back to 4G and perform VoLTE when initiating the calling and called voice services. As shown in Figure 2, the solution mainly includes the following steps:

S201. After the UE registers with 5G, if it initiates a calling or called voice service, the voice service establishment request signaling (IMSSIP signaling) triggers the 5G Core Network (5G Core Network, 5GC) network to establish a 5G QoS identifier (5G QoSIdentifier, 5QI)=1QoS flow.

S202. The 5GC network function entity (Network Function, NF) initiates a QoS flow proposal request to the NG RAN to request the establishment of an air interface tunnel and an N3 tunnel corresponding to the 5QI=1 QoS flow.

S203. When the NG RAN receives the QoS flow proposal request (5QI=1), it triggers the UE handover or redirection process, which is used to handover or redirect the UE to the 4G LTE cell.

S204. The NG RAN interacts with the core network, refuses to modify the protocol data unit (Protocol Data Unit, PDU) session indication, and executes the multimedia subsystem (IP Multimedia Subsystem, IMS) voice fallback process.

S205. The UE switches or redirects to the 4G LTE cell. After the UE accesses the 4G LTE cell, if the N26 interface is deployed, S206a is executed. If the N26 interface is not deployed, S206b is executed.

S206a. Tracking Area update (TAU) process performed by the UE, which is used to register or update the location in the 4G network.

S206b. The UE performs attach (attach) and concurrently establishes a handover attach (handover attach) type PDN connection process.

After the TAU process or the attach process ends, the UE re-establishes an IMS Packet Data Network (PDN) connection on the 4G network. This connection is used to transmit direct signaling between the UE and the IMS network.

S207. The Evolved Packet Core (EPC) network triggers the establishment of a QCI=1 bearer on the 4G network according to IMS signaling. The bearer is used to transmit VoLTE service user plane data.

S208. The VoLTE calling and called parties are established and the call can be made normally.

For a UE that is originally in the idle state, if the caller initiates a 5G voice service, based on the above solution, the UE needs to first initiate a 5G service request (service request) process, enter the 5G connected state, and then trigger the above process steps; for a UE that is originally in the idle state, For example, if the UE is the called party of the voice service, based on the above mechanism, the 5G network needs to page the UE in the 5G cell first to make it enter the connected state, and then trigger the above process steps. It can be seen from this that for idle state UE, using the above solution, whether the UE is the calling party or the called party of voice service, the UE needs to enter the 5G network connection state first, and then enter 4G through network switching or other methods. This results in a long continuous delay for initiating 5G voice services to idle UEs and poor user experience.

The voice service implementation solution provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

Figure 3 shows a schematic flowchart of a transmission method in an embodiment of the present application. The method 300 can be executed by a terminal. In other words, the method may be performed by software or hardware installed on the terminal. As shown in Figure 3, the method may include the following steps.

S310: After obtaining the target indication, the terminal residing in the first network triggers network reselection to the second network.

In this embodiment of the present application, the terminal residing in the first network may be in an idle state or a connected state, which is not specifically limited in this embodiment of the present application.

In this embodiment of the present application, the first network includes but is not limited to a 5G network, and the second network includes but is not limited to an Evolved Packet System (EPS) network, which may also be called a 4G network or an LTE network.

In this embodiment of the present application, the terminal may use different wireless access technologies for the first network and the second network.

S312: The terminal performs voice services on the second network.

In this embodiment of the present application, after the terminal residing in the first network obtains the target indication, it triggers network reselection to the second network, and then performs voice services on the second network, so that the terminal residing in the first network can Quickly fall back to the second network to perform voice services, and if the terminal is in an idle state, there is no need to enter the connected state in the first network and then fall back to the second network, but directly perform network reselection, thereby shortening the voice service delay.

In a possible implementation of the embodiment of the present application, the terminal obtains the target indication for the terminal's first non-access stratum (Non Access Stratum, NAS) to obtain the first indication from the upper layer of the terminal. The first indication includes: Not limited to one of the following:

(1) Multimedia telephone service (Multimedia telephone, MMTel) voice call instructions;

(2) MMTel voice call start indication;

(3)MMTel video call instructions;

(4) MMTel video call start instruction;

(5) Uplink IP multimedia subsystem IMS registration related signaling instructions;

(6) Uplink IMS registration related signaling start indication;

(7) IP-based short message SMSoIP indication;

(8) SMSoIP start indication.

That is to say, in the above possible implementation manner, after the first NAS of the terminal obtains the first instruction from the upper layer, it triggers network reselection to the second network. For example, when the terminal initiates the calling process, the upper layer sends the first instruction to the terminal's first NAS to trigger network reselection to the second network.

Optionally, the upper layer of the terminal may be an IMS sublayer.

In a possible implementation, since the first NAS of the terminal determines to trigger network reselection to the second network, in order to enable the IMS sublayer to learn this information, after the first NAS of the terminal receives the target indication, the The method further includes: the first NAS of the terminal notifies the IMS sublayer of the terminal to wait for a response from the second NAS of the terminal. For example, the interaction between UE 5G NAS and IMS: UE 5G NAS notifies the IMS layer that the UE wants to initiate EPS fallback, so the IMS sublayer waits for a response from the EPS NAS (that is, UE LTE NAS).

In the application embodiment, the first NAS of the terminal corresponds to the first network, for example, the 5G NAS of the terminal, which may further be 5GMM or 5GSM. The second NAS may correspond to the second network, for example, UE LTE NAS, or EMM.

In another possible implementation manner of the embodiment of this application, the terminal obtaining the target indication may also be the terminal receiving the first message from the first network. Optionally, the first message may be a paging message. For example, the terminal, as the called party, triggers network reselection to the second network after receiving the paging message sent by the 5G network.

In a possible implementation, the network side may carry first indication information in the paging message, and the first indication information includes at least one of the following: an indication of falling back to the second network, the network side supporting the transition from the second network to the second network. Indication of one network falling back to the second network. For example, the paging message carries an EPS fallback indication (EPS fallback indication). In this possible implementation, the network side can instruct the terminal to fall back to the second network by carrying the first indication information in the paging message or instruct the network side of the terminal to support fallback from the first network to the second network, so that the terminal can According to the first indication information, network reselection to the second network is triggered.

In the above possible implementation manner, some terminals may not have the ability to support paging messages carrying instructions for falling back to the second network. Therefore, in order to make the terminals consistent with the understanding of the network side, they can obtain the paging messages carried in the paging messages. Instructions to fall back to the second network. In one possible implementation, before the first NAS of the terminal receives the first message from the first network, the method may further include: the terminal sends a message to the network side. A NAS message, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has the ability to support a paging message carrying the first indication information. Optionally, the NAS message may be a registration message, for example, an initial registration message, or a registration message for mobility registration update. One implementation is to set the value of a certain bit of the 5GMM capability information element in the registration message to 1, which is used to indicate that the terminal has the ability to support the paging message carrying the first indication information. The value of this bit is set to 1. 0, used to indicate that the terminal does not have the capability to support the paging message carrying the first indication information.

In a possible implementation, in order for the network side to know that the terminal triggered network reselection to the second network after receiving the paging message, the terminal may notify the network side when responding to the paging message to the network side. Therefore, in this possible implementation, after receiving the paging message, the method may further include: the terminal responds to the paging message from the first network and sends a paging response, wherein the paging message The call response carries an instruction to fall back to the second network.

In a possible implementation, the paging response may include a service request message, and the indication of falling back to the second network may be an indication value in a request type information element in the service request message. That is to say, the terminal sets the value of the request type information element in the service request message to an indication value indicating fallback to the second network. Through this possible implementation, signaling overhead can be reduced.

In another possible implementation, the paging response may include a service request message, and the indication of falling back to the second network may be an EPSfallback information element in the service request message.

In a possible implementation, in S310, triggering network reselection by the terminal to the second network may include: the first NAS of the terminal triggering network reselection to a cell of the second network. That is to say, in this possible implementation, the first NAS of the terminal may trigger network reselection to the second network.

In a possible implementation, the first NAS triggering network reselection to a cell of the second network may include:

Step 1: The first NAS of the terminal sends a second instruction to the second NAS of the terminal, where the second instruction includes an instruction to fall back to the second network.

For example, UE LTE NAS. For example, the UE 5G NAS may interact with the UE LTE NAS, and the second indication sent by the UE 5G NAS to the UELTE NAS may indicate that the UE wants to perform EPS fallback.

Step 2: The second NAS sends a third indication to the second access stratum (AS) of the terminal, and uses the third indication to trigger the target AS to initiate Radio Resource Control (RRC). ) establishment process, wherein the third indication includes: an indication to fall back to the second network, and the third indication further includes: an attach request or a tracking area update (TAU) request.

Wherein, the target AS of the terminal corresponds to the second network, for example, the UE LTE AS. . To facilitate distinction, in the following description of the embodiments of this application, the AS of the terminal corresponding to the first network (for example, UE 5G AS) is called the first AS, and the target AS of the terminal is called the second AS.

Step 3: During the RRC establishment process, the second AS of the terminal sends a fourth indication to the base station (for example, eNB), where the fourth indication includes: an indication to fall back to the second network, and the fourth indication Also includes: attach request message or tracking area update TAU request message.

For example, the UE LTE NAS triggers the UE LTE AS reselection, and after discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates the RRC establishment process. Optionally, the UE LTE AS can send a fourth indication to the eNB. The four instructions include one of the following:

- Indication of fallback to the second network (e.g. EPS fallback indication (UE to network));

-attach request;

-TAU request;

-Other instructions TBD;

In a possible implementation, after the second NAS of the terminal sends the third indication to the second AS of the terminal, the method further includes: the second NAS of the terminal receives the network side response to the attachment. A requested attach accept message or a TAU accept message in response to the TAU request. For example, after the UE enters the LTE connected state, it receives an attach accept message or TAU accept message responded by the network side, and completes the attach process or TAU process.

In a possible implementation, after the second NAS of the terminal receives an attach accept message from the network side in response to the attach request or a TAU accept message in response to the TAU request, the method may further include:

Step 1: The second NAS of the terminal establishes a PDN connection for IMS services in the second network;

Step 2: The second NAS of the terminal sends a response indication to the upper layer of the terminal (for example, IMS sublayer), where the response indication is an indication that the PDN connection or EPS bearer for the IMS service is successfully established.

For example, after the UE enters the LTE connected state, completes the attach process or TAU process, and successfully establishes a PDN connection for IMS services, the UE LTE NAS sends one of the following instructions to the IMS layer:

-Indication of successful establishment of PDN connection/EPS bearer for IMS services;

-EPS bearer identity (EBI).

After the second NAS of the terminal sends a response indication to the upper layer of the terminal, the second NAS of the terminal interacts with the upper layer to implement voice services.

In a possible implementation, the terminal triggering network reselection to a cell of the second network may include: the terminal triggering network reselection to a cell of the second network based on the target information.

For example, target information may include at least one of the following:

(1) Historical call information of the terminal, wherein the historical call information indicates that the terminal's historical voice services on the first network were performed by falling back to the second network;

(2) The first indication information sent by the network side device, wherein the first indication information includes at least one of the following: an indication of fallback to the second network, and an indication that the network side supports fallback from the first network to the second network. Optionally, the first indication information may be system information broadcast by the network side device, or may be information carried in a paging message of the network side device paging the terminal. For example, in the above possible implementation manner, the paging message The first instruction information carried in .

(3) Capability information of the terminal, wherein the capability information indicates that the terminal has the ability to fall back to the second network.

Of course, it is not limited to this. In practical applications, the terminal can also directly trigger network reselection to the second network after receiving the target indication, without triggering network reselection to the second network based on the target information. community.

Through the technical solutions provided by the embodiments of this application, the UE can obtain the network's capability information for voice services falling back to 4G. When the UE triggers the calling voice or the called UE voice service, the UE can obtain the network-side capability information based on the above. At least one of its own capability information and historical call information is used to actively trigger network reselection to a 4G cell to obtain VoLTE services.

In this embodiment of the present application, the UE can be directly reselected to a 4G cell to directly perform VoLTE services, which avoids the process of the UE first entering the connected state in the 5G network and then falling back to 4G, thereby saving a certain amount of call delay.

Figure 4 shows a schematic flowchart of a paging method in an embodiment of the present application. The method 400 can be executed by a network side device. For example, the network side device can be an access network device or a core network device. In other words, the method may be executed by software or hardware installed on the network side device. As shown in Figure 4, the method may include the following steps.

S410: The network side device receives the NAS message sent by the terminal.

Wherein, the NAS message carries second indication information, and the second indication information indicates that the terminal has the ability to support paging messages carrying first indication information, and the first indication information includes at least one of the following: fallback Instructions to the second network, and instructions on the network side to support fallback from the first network to the second network. For example, the first indication information may include an EPS fallback indication.

S412: The network side device sends a paging message to the terminal, where the paging message carries the first indication information.

In a possible implementation, after S412, the method may further include: the network side device receiving a paging response sent by the terminal, wherein the paging response carries an instruction to fall back to the second network. . Through the paging response, the network side device can learn that the terminal will fall back to the second network.

In a possible implementation, the paging response includes a service request message, and the indication of falling back to the second network is an indication value in a request type information element in the service request message. That is to say, the value of the request type information element in the service request message sent by the terminal is an indication value indicating fallback to the second network. In another possible implementation, the paging response may include a service request message, and the indication of falling back to the second network may be an EPSfallback information element in the service request message. Through this possible implementation, signaling overhead can be reduced.

Through the technical solutions provided by the embodiments of this application, the UE can obtain the MT voice call information of the network and the instruction to fall back to 4G through the paging message, so that it can directly reselect to the 4G cell to directly obtain the VoLTE service, avoiding the need for the UE to first The 5G network enters the connected state and then falls back to 4G, which can save a certain amount of call delay.

The following takes the 5G UE in the idle state and serving as the called party or the calling party of the voice service as an example to describe the technical solution provided by the embodiment of the present application.

In this embodiment of the present application, the NG RAN or AMF may deliver first capability indication information to the UE. The first capability indication information is used to indicate that the network side has the capability of EPS fallback, that is, the network side supports EPS fallback. 5G UE performing voice services may include the following steps.

Step 1. The UE 5GNAS decides to reselect to LTE and executes EPS fallback according to the following instructions. The form of the instruction is one of the following:

(1) Indication of UE IMS sublayer, which may include one of the following:

-MMTEL voice call indication or start indication ((start of)an MMTEL voice call from the upper layers);

-MMTEL video call indication or start indication ((start of)MMTEL video call from the upper layers);

-IMS registration related signaling indication or start indication ((start of)an MO IMS registrationrelated signaling from the upper layers);

-SMSoIP indication or start indication ((start of) SMSoIP from the upper layers).

(2) Instructions from the network side may include one of the following:

-paging message + system broadcast SIB (SIB includes EPS fallback indication);

-paging message (the paging message carries the EPS fallback indication). In this case, the UE carries a paging message (paging indication for EPS fallback) capability indication indicating that the terminal has support for carrying EPS fallback in the NAS message (eg, registration message) previously sent to the UE, or something similar. other instructions.

Step 2: After receiving the upper layer instruction in step 1, the UE 5G NAS (for example, it can be 5GMM) decides not to initiate the process of entering the 5G connected state according to the following conditions, but instead the UE actively triggers idle state reselection to LTE:

-UE historical call information (UE historical call information indicates that the UE's historical calls are all voice calls obtained through EPS fallback);

-Information provided by the UE 5G AS, such as: system broadcast (the system broadcast indicates that the network supports enhanced EPSfallback).

Optionally, for the calling voice service, the UE 5G NAS can interact with the IMS: the UE 5G NAS notifies the IMS layer that the UE wants to initiate an EPS fallback, so the IMS layer waits for a response from the EPS NAS (UE LTE NAS).

Step 3: UE 5G NAS (for example, 5GMM) and UE LTE NAS (for example, EMM) interact. The instructions sent by 5GMM to EMM may indicate:

-UE needs to perform EPS fallback.

Step 4: The UE LTE NAS (for example, EMM) triggers the UE LTE AS reselection. After discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates the RRC establishment process. Optionally, the UE LTE AS can The network eNB sends an indication, which may include one of the following:

-EPS fallback indication (UE to network);

-attach request;

-TAU request.

Step 5: After the UE enters the LTE connected state, completes the attach process or TAU process, and successfully establishes the PDN connection for the IMS service, the UE LTE NAS sends one of the following instructions to the IMS layer:

-The PDN connection/EPS bearer for IMS services is successfully established;

-EBI.

Step 6: Interaction between LTE NAS and IMS layers to implement voice services.

The following takes the calling voice service as an example to describe the technical solution provided by the embodiment of the present application through the interaction of various layers within the UE.

Figure 5 shows a schematic flow chart of a method for implementing a calling voice service in an embodiment of the present application. As shown in Figure 5, the method mainly includes the following steps.

S501, the UE needs to initiate an MO call, and the IMS sublayer sends relevant instructions to the UE 5G NAS layer. The relevant instructions may be one of the following:

-(start of)an MMTEL voice call from the upper layers;

-(start of)MMTEL video call from the upper layers;

-(start of)an MO IMS registration related signaling from the upperlayers;

-(start of)SMSoIP from the upper layer.

S502, after receiving the upper layer instruction in 1, the UE 5G NAS (5GMM in the figure) decides not to initiate the process of entering the 5G connected state based on the following conditions, but instead the UE actively triggers idle state reselection to LTE:

-UE historical call information (UE historical call information indicates that the UE's historical calls are all voice calls obtained through EPS fallback);

-Information provided by the UE 5G AS, such as: system broadcast (the system broadcast indicates that the network supports enhanced EPSfallback).

Optionally, the method may also include S502a, interaction between UE 5G NAS and IMS: UE 5G NAS notifies the IM sub-S layer that the UE wants to initiate EPS fallback. Therefore, the IMS sub-layer waits for a response from the EPS NAS (i.e. UE LTE NAS). . Under normal circumstances, after receiving the above instructions from the IMS sublayer, the UE 5G NAS should directly establish the relevant PDU session, and/or QoS flow for IMS signaling, MMTEL voice, MMTEL video or SMSoIP. , MMTELvoice, MMTEL video, SMSoIP), and feeds back the establishment success message to the IMS layer. However, since the UE 5G NAS is determined to fall back to EPS, the UE 5G NAS notifies the IMS sublayer to wait for a response from the EPS NAS (UE LTE NAS) .

S503, the UE 5G NAS (5GMM in the figure) and the UE LTE NAS (EMM in the figure) interact. The instructions sent by the 5GMM to the EMM may indicate:

-UE needs to perform EPS fallback.

S504. The UE LTE NAS (EMM in the figure) triggers the UE LTE AS reselection. After discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates the RRC establishment process. Optionally, during the RRC establishment process, the UE LTE AS can send instructions to the network eNB, including one of the following:

-EPS fallback indication (UE to network);

-attach request;

-TAU request.

S505. The LTE NAS receives an attach accept message (attach accept) from the network side in response to the attach request or a TAU accept message (TAU accept) in response to the TAU request. S506. Interaction between LTE NAS and IMS layers. Specifically, as shown in Figure 5, the following S506a, S506b, S506c and S506d may be included.

S506a, the EMM notifies the ESM that the MM connection is established.

S506b: The EMM notifies the IMS sublayer that the UE registers with the EPS.

S506c, the EMM notifies the ESM layer of bearer status information.

S506d, after the UE enters the LTE connected state, completes the attach process or TAU process, and successfully establishes the PDN connection for the IMS service, the UE LTE NAS sends one of the following instructions to the IMS sublayer:

-Indication of successful establishment of PDN connection or EPS bearer for IMS services;

-EBI.

Through the above technical solutions provided by the embodiments of this application, when the UE triggers the calling voice service, it can trigger network reselection to a 4G cell based on at least one of the network side's capability information, historical call information, and its own capability information. Used to obtain VoLTE services. This prevents the UE from first entering the connected state in the 5G network and then falling back to 4G, thus saving a certain amount of call delay.

The following takes the called voice service as an example to describe the technical solution provided by the embodiment of the present application through the interaction of various layers within the UE.

Figure 6 shows a schematic flowchart of a method for implementing a called voice service in an embodiment of the present application. As shown in Figure 6, the method mainly includes the following steps.

S601. The UE receives an instruction from the network, which is one of the following:

-paging message + system broadcast SIB (the SIB carries the EPS fallback indication);

-paging message (the paging message carries an indication of EPS fallback). In this case, the UE carries an indication indicating that the terminal has support for carrying EPS fallback in the NAS message (for example, registration message) previously sent to paging indication for EPS fallback, human capability indication, or other similar indications.

S602, after receiving the upper layer instruction in S601, the UE 5G NAS (5GMM in the figure) decides not to initiate the process of entering the 5G connected state based on the following conditions, but the UE actively triggers the idle state reselection to LTE:

-UE historical call information (UE historical call information indicates that the UE's historical calls are all voice calls obtained through EPS fallback);

-Information provided by the UE 5G AS, such as: system broadcast (the system broadcast indicates that the network supports enhanced EPSfallback);

Optionally, the method may also include S602a, interaction between UE 5G NAS and IMS: UE 5G NAS notifies the IMS layer that the UE wants to initiate EPS fallback, so the IMS sublayer waits for a response from the EPS NAS (UE LTE NAS). Under normal circumstances, after receiving the instruction in S601, the UE5G NAS should directly establish the relevant PDU session, and/or QoS flow for IMS signaling, MMTEL voice, MMTEL video or SMSoIP. , MMTELvideo, SMSoIP), and feeds back the establishment success message to the IMS layer. However, since the UE 5G NAS is determined to fall back to EPS, the UE 5G NAS notifies the IMS sublayer to wait for a response from the EPS NAS (UE LTE NAS).

In addition, as shown in Figure 6, the method may also include: S602b, the UE 5G NAS responds to the paging of the first network and sends a paging response to the 5GS, where the paging response carries an EPS fallback indication.

In a possible implementation, the paging response may include a service request message, and the indication of EPS fallback may be an indication value in a request type information element in the service request message. That is to say, the terminal sets the value of the request type information element in the service request message to the indication value indicating EPS fallback. Through this possible implementation, signaling overhead can be reduced. In another possible implementation, the paging response may include a service request message, and the indication of EPS fallback may be an EPS fallback information element in the service request message.

S603, the UE 5G NAS (5GMM in the figure) and the UE LTE NAS (EMM in the figure) interact. The instructions sent by the 5GMM to the EMM may indicate:

-UE needs to perform EPS fallback.

S604. The UE LTE NAS (EMM in the figure) triggers the UE LTE AS reselection. After discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates the RRC establishment process. Optionally, during the RRC establishment process, the UE LTE AS can send instructions to the network eNB, including one of the following:

-EPS fallback indication (UE to network);

-attach request;

-TAU request.

S605. The LTE NAS receives an attach accept message (attach accept) from the network side in response to the attach request or a TAU accept message (TAU accept) in response to the TAU request.

S606. Interaction between LTE NAS and IMS layers. Specifically, as shown in Figure 6, the following S606a, S606b, S606c and S606d may be included.

S606a, the EMM notifies the ESM that the MM connection is established.

S606b: The EMM notifies the IMS sublayer that the UE registers with the EPS.

S606c: The EMM notifies the ESM layer of bearer status information.

S606d, after the UE enters the LTE connected state, completes the attach process or TAU process, and successfully establishes the PDN connection for the IMS service, the UE LTE NAS sends one of the following instructions to the IMS sublayer:

-Indication of successful establishment of PDN connection or EPS bearer for IMS services;

-EBI.

Through the above technical solutions provided by the embodiments of this application, when triggering the called voice service, the UE can trigger network reselection to a 4G cell based on at least one of the network side's capability information, historical call information, and its own capability information. Used to trigger VoLTE services. This prevents the UE from first entering the connected state in the 5G network and then falling back to 4G, thus saving a certain amount of call delay.

For the voice service implementation method provided by the embodiments of this application, the execution subject may be a voice service implementation device. In the embodiments of this application, the voice service implementation device executing the voice service implementation method is used as an example to illustrate the voice service implementation device provided by the embodiments of this application.

Figure 7 shows a schematic structural diagram of a voice service implementation device provided by an embodiment of the present application. As shown in Figure 7, the device 700 mainly includes: a trigger module 701 and an execution module 702.

In this embodiment of the present application, the trigger module 701 is used to trigger the terminal to perform network reselection to the second network after obtaining the target indication, wherein the terminal resides in the first network; the execution module 702 is used to perform network reselection on the first network. The second network performs voice services.

In a possible implementation, the triggering module 701 obtaining the target indication includes one of the following:

Obtain the first indication from the upper layer of the terminal through the first non-access layer NAS of the terminal, where the first NAS of the terminal corresponds to the first network:

A first message is received from the first network, wherein the first message includes a paging message.

In a possible implementation, the paging message carries first indication information, and the first indication information includes at least one of the following: an indication of fallback to the second network, network side support for fallback from the first network to the third network. Instructions from the second network; as shown in Figure 7, the device further includes: a first sending module 703, configured to send a NAS message to the network side, where the NAS message carries second indication information, and the second indication The information indicates that the terminal has the ability to support the paging message carrying the first indication information.

In a possible implementation, as shown in Figure 7, the device may further include: a response module 703, configured to respond to a paging message from the first network and send a paging response, wherein the paging response It carries instructions to fall back to the second network.

In a possible implementation, the triggering module 701 triggering network reselection to the second network includes: triggering network reselection to a cell of the second network through the first NAS of the terminal.

In a possible implementation, the triggering module 701 triggers network reselection to a cell of the second network through the first NAS of the terminal, including:

A second indication is sent through the first NAS of the terminal to the second NAS of the terminal, wherein the second indication includes: an indication of falling back to the second network, and the second NAS corresponds to the second network ;

The second NAS of the terminal sends a third indication to the target AS of the terminal, and the third indication triggers the target AS of the terminal to initiate a radio resource control RRC establishment process, where the third indication includes: An indication to fall back to the second network, the third indication further includes: an attach request or a tracking area update TAU request, and the target AS corresponds to the second network;

During the RRC establishment process, a fourth indication is sent to the base station through the target AS of the terminal, wherein the fourth indication includes: an indication to fall back to the second network, and the third indication also includes: an attach request message or tracking Area update TAU request message.

In a possible implementation, the triggering module 701 is further configured to receive an attach acceptance response from the network side in response to the attach request after sending a third indication to the target AS of the terminal through the second NAS of the terminal. message or a TAU acceptance message in response to the TAU request.

In a possible implementation, the trigger module 701 is also used to:

Establish a PDN connection for IMS services in the second network through the second NAS of the terminal;

A response indication is sent to the upper layer of the terminal through the second NAS of the terminal, where the response indication is an indication that the PDN connection or EPS bearer for the IMS service is successfully established.

In a possible implementation, the upper layer of the terminal includes: IMS sublayer;

The triggering module 701 is also configured to notify the IMS sublayer of the terminal through the first NAS of the terminal to wait for a response from the second NAS of the terminal.

In a possible implementation, the triggering module 701 triggers network reselection to a cell of the second network, including: triggering network reselection to a cell of the second network based on the target information.

In a possible implementation, the target information includes at least one of the following:

Historical call information of the terminal, wherein the historical call information indicates that the terminal's historical voice services on the first network were performed by falling back to the second network;

The first indication information sent by the network side device, wherein the first indication information includes at least one of the following: an indication of fallback to the second network, an indication that the network side supports fallback from the first network to the second network;

Capability information of the terminal, wherein the capability information indicates that the terminal has the ability to fall back to the second network.

In a possible implementation, the first indication information sent by the network side device includes:

System information broadcast by network-side devices; or,

The network side device paging the information carried in the paging message of the terminal.

In a possible implementation, the first network includes a 5G network, and the second network includes an Evolved Packet System EPS network.

In a possible implementation, the indication to fall back to the second network includes an EPS fallback indication.

The voice service implementation device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip. The electronic device may be a terminal or other devices other than the terminal. For example, terminals may include but are not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in the embodiment of this application.

The voice service implementation device provided by the embodiments of this application can implement each process implemented by the terminal in the method embodiments of Figures 3 to 6, and achieve the same technical effect. To avoid duplication, details will not be described here.

For the paging method provided by the embodiment of the present application, the execution subject may be a paging device. In the embodiment of the present application, a paging device performing a paging method is used as an example to describe the paging device provided by the embodiment of the present application.

Figure 8 shows a schematic structural diagram of a paging device provided by an embodiment of the present application. As shown in Figure 8, the device 800 mainly includes: a receiving module 801 and a second sending module 802.

In this embodiment of the present application, the receiving module 801 is configured to receive a NAS message sent by a terminal, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has support for carrying the first indication information. The capability of paging messages, the first indication information includes at least one of the following: an indication of falling back to the second network, an indication that the network side supports falling back from the first network to the second network; the second sending module 802 is used to Send a paging message to the terminal, where the paging message carries first indication information.

In a possible implementation, the receiving module 801 is further configured to receive a paging response sent by the terminal, where the paging response carries an indication of falling back to the second network.

The paging device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip. The electronic device may be a network-side device or other devices other than the terminal. For example, network side devices may include but are not limited to the types of network side devices 12 listed above. Other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in this embodiment of the application.

The paging device provided by the embodiments of the present application can implement each process implemented by the network side device in the method embodiments of Figures 3 to 6, and achieve the same technical effect. To avoid duplication, the details will not be described here.

Optionally, as shown in Figure 9, this embodiment of the present application also provides a communication device 900, which includes a processor 901 and a memory 902. The memory 902 stores programs or instructions that can be run on the processor 901, for example. , when the communication device 900 is a terminal, when the program or instruction is executed by the processor 901, each step of the above voice service implementation method embodiment is implemented, and the same technical effect can be achieved. When the communication device 900 is a network-side device, when the program or instruction is executed by the processor 901, the steps of the above paging method embodiment are implemented, and the same technical effect can be achieved. To avoid duplication, they will not be described again here.

An embodiment of the present application also provides a terminal, which includes a processor and a communication interface. The processor is used to implement each step of the above voice service implementation method embodiment, and the communication interface is used to communicate with external devices. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 10 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 1000 includes but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009, a processor 1010, etc. At least some parts.

Those skilled in the art can understand that the terminal 1000 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 1010 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 10 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processing unit (GPU) 10041 and a microphone 10042. The graphics processor 10041 is responsible for the image capture device (such as Process the image data of still pictures or videos obtained by the camera). The display unit 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072 . Touch panel 10071, also known as touch screen. The touch panel 10071 may include two parts: a touch detection device and a touch controller. Other input devices 10072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1001 can transmit it to the processor 1010 for processing; in addition, the radio frequency unit 1001 can send uplink data to the network side device. Generally, the radio frequency unit 1001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

Memory 1009 may be used to store software programs or instructions as well as various data. The memory 1009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc. Additionally, memory 1009 may include volatile memory or nonvolatile memory, or memory 1009 may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (ProgrammableROM, PROM), erasable programmable read-only memory (ErasablePROM, EPROM), electrically erasable read-only memory (EPROM), Programming read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM) , SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (Direct RambusRAM, DRRAM). The memory 1009 in the embodiment of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 1010.

Among them, the processor 1010 is configured to trigger the terminal to perform network reselection to a second network after obtaining the target indication, wherein the terminal resides on the first network; and performs voice services on the second network.

An embodiment of the present application also provides a network side device, including a processor and a communication interface. The processor is used to implement each step of the above paging method embodiment, and the communication interface is used to communicate with an external device. This network-side device embodiment corresponds to the above-mentioned network-side device method embodiment. Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in Figure 11, the network side device 1100 includes: an antenna 1101, a radio frequency device 1102, a baseband device 1103, a processor 1104 and a memory 1105. The antenna 1101 is connected to the radio frequency device 1102. In the uplink direction, the radio frequency device 1102 receives information through the antenna 1101 and sends the received information to the baseband device 1103 for processing. In the downlink direction, the baseband device 1103 processes the information to be sent and sends it to the radio frequency device 1102. The radio frequency device 1102 processes the received information and then sends it out through the antenna 1101.

The method performed by the network side device in the above embodiment can be implemented in the baseband device 1103, which includes a baseband processor.

The baseband device 1103 may include, for example, at least one baseband board, which is provided with multiple chips, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.

The network side device may also include a network interface 1106, which is, for example, a common public radio interface (CPRI).

Specifically, the network side device 1100 in this embodiment of the present invention also includes: instructions or programs stored in the memory 1105 and executable on the processor 1104. The processor 1104 calls the instructions or programs in the memory 1105 to execute each of the steps shown in Figure 8. The method of module execution and achieving the same technical effect will not be described in detail here to avoid duplication.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the above voice service implementation method embodiment is implemented, or the above mentioned processes are implemented. Each process of the paging method embodiment can achieve the same technical effect. To avoid duplication, it will not be described again here.

Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the above embodiments of the voice service implementation method. Each process, or each process of implementing the above paging method embodiment, can achieve the same technical effect. To avoid duplication, it will not be described again here.

It should be understood that the chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the above voice service implementation method. Each process of the above example, or each process of implementing the above paging method embodiment, can achieve the same technical effect. To avoid duplication, it will not be described again here.

Embodiments of the present application also provide a voice service implementation system, including: a terminal and a network side device. The terminal can be used to perform the steps of the voice service implementation method as described above. The network side device can be used to perform the above steps. The steps of the paging method.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk , CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims (38)

1. A voice service implementation method, characterized by including: After the terminal residing in the first network obtains the target indication, it triggers network reselection to the second network; The terminal performs voice services on the second network. 2. The method according to claim 1, wherein the terminal obtaining target indication includes one of the following: The first non-access layer NAS of the terminal obtains the first indication from the upper layer of the terminal, wherein the first NAS corresponds to the first network; The terminal receives a first message from a first network. 3. The method of claim 2, wherein the first indication includes one of the following: Multimedia telephone service MMTel voice call instructions; MMTel voice call start indication; MMTel video call instructions; MMTel video call start indication; Uplink IP multimedia subsystem IMS registration related signaling instructions; Uplink IMS registration related signaling start indication; IP-based short message SMSoIP indication; SMSoIP start indication. 4. The method according to claim 2, wherein the first message includes: a paging message for paging the terminal. 5. The method according to claim 4, characterized in that the paging message carries first indication information, and the first indication information includes at least one of the following: an indication of falling back to the second network, network side support Indication of fallback from the first network to the second network. 6. The method according to claim 4, characterized in that the method further comprises: the terminal responds to a paging message from the first network and sends a paging response, wherein the paging response carries Instructions to fall back to the second network. 7. The method according to claim 6, wherein the paging response includes a service request message, and the indication of falling back to the second network is an indication in the request type information element in the service request message. value. 8. The method of claim 5, wherein before the terminal receives the first message from the first network, the method further includes: The terminal sends a NAS message to the network side, where the NAS message carries second indication information, and the second indication information indicates that the terminal has the ability to support paging messages carrying the first indication information. 9. The method of claim 2, wherein the terminal triggers network reselection to the second network, including: The first NAS of the terminal triggers network reselection to a cell of the second network. 10. The method according to claim 9, characterized in that the first NAS of the terminal triggers network reselection to a cell of the second network, including: The first NAS of the terminal sends a second indication to the second NAS of the terminal, where the second indication includes an indication of falling back to the second network, and the second NAS of the terminal corresponds to the second network; The second NAS of the terminal sends a third indication to the target access layer AS of the terminal, and triggers the target AS of the terminal to initiate a radio resource control RRC establishment process through the third indication, wherein the third The indication includes: an indication to fall back to the second network, the third indication also includes: an attach request or a tracking area update TAU request, and the target AS of the terminal corresponds to the second network; During the RRC establishment process, the target AS of the terminal sends a fourth indication to the base station, where the fourth indication includes: an indication to fall back to the second network, and the fourth indication also includes: an attach request message or a TAU request. information. 11. The method according to claim 10, characterized in that, after the second NAS of the terminal sends a third indication to the second access AS of the terminal, the method further includes: The second NAS of the terminal receives an attach accept message from the network side in response to the attach request or a TAU accept message in response to the TAU request. 12. The method according to claim 11, characterized in that, after the second NAS of the terminal receives an attach accept message from the network side in response to the attach request or a TAU accept message in response to the TAU request, the Methods also include: The second NAS of the terminal establishes a PDN connection for IMS services in the second network; The second NAS of the terminal sends a response indication to the upper layer of the terminal, where the response indication is an indication that the PDN connection or EPS bearer for the IMS service is successfully established. 13. The method according to any one of claims 2 to 12, characterized in that the upper layer of the terminal includes: IMS sublayer. 14. The method according to claim 13, characterized in that, after the first NAS of the terminal obtains the first indication from the upper layer of the terminal, the method further includes: The first NAS of the terminal notifies the IMS sublayer of the terminal to wait for a response from the second NAS of the terminal. 15. The method according to any one of claims 1 to 12, wherein the terminal triggers network reselection to a cell of the second network, including: The terminal triggers network reselection to a cell of the second network based on the target information. 16. The method according to claim 15, characterized in that the target information includes at least one of the following: Historical call information of the terminal, wherein the historical call information indicates that the terminal's historical voice services on the first network were performed by falling back to the second network; The first indication information sent by the network side device, wherein the first indication information includes at least one of the following: an indication of fallback to the second network, an indication that the network side supports fallback from the first network to the second network; Capability information of the terminal, wherein the capability information indicates that the terminal has the ability to fall back to the second network. 17. The method according to claim 16, characterized in that the first indication information sent by the network side device includes: System information broadcast by network-side devices; or, The network side device paging the information carried in the paging message of the terminal. 18. The method according to any one of claims 1 to 12, wherein the first network includes a 5G network, and the second network includes an Evolved Packet System EPS network. 19. The method according to any one of claims 6, 7 and 10, characterized in that the indication of fallback to the second network includes an EPS fallback indication. 20. A paging method, characterized by including: The network side device receives a NAS message sent by the terminal, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has the ability to support a paging message carrying the first indication information, and the third indication information An indication information includes at least one of the following: an indication to fall back to the second network, an indication that the network side supports fallback from the first network to the second network; The network side device sends a paging message to the terminal, where the paging message carries first indication information. 21. The method according to claim 20, characterized in that, after the network side device sends a paging message to the terminal, the method further includes: The network side device receives a paging response sent by the terminal, where the paging response carries an instruction to fall back to the second network. 22. The method according to claim 21, wherein the paging response includes a service request message, and the indication of falling back to the second network is an indication in the request type information element in the service request message. value. 23. The method according to any one of claims 20 to 22, wherein the instruction to fall back to the second network includes an EPS fallback instruction. 24. A voice service implementation device, characterized in that it includes: A triggering module configured to trigger the terminal to perform network reselection to the second network after obtaining the target indication, wherein the terminal resides in the first network; An execution module, configured to execute voice services on the second network. 25. The device according to claim 24, wherein the triggering module obtaining the target indication includes one of the following: Obtain the first indication from the upper layer of the terminal through the first non-access layer NAS of the terminal, where the first NAS of the terminal corresponds to the first network: A first message is received from the first network, wherein the first message includes a paging message. 26. The device according to claim 25, wherein the paging message carries first indication information, and the first indication information includes at least one of the following: an indication of falling back to the second network, network side support An instruction to fall back from the first network to the second network; the device further includes: A first sending module configured to send a NAS message to the network side, where the NAS message carries second indication information, and the second indication information indicates that the terminal has a paging message that supports carrying the first indication information. Ability. 27. The device according to claim 25, further comprising: a response module configured to respond to a paging message from the first network and send a paging response, wherein the paging response carries fallback Instructions to the second network. 28. The device according to claim 25, wherein the triggering module triggering network reselection to the second network includes: triggering network reselection to a cell of the second network through the first NAS of the terminal. 29. The device according to claim 28, wherein the trigger module triggers network reselection to a cell of the second network through the first NAS of the terminal, including: A second indication is sent through the first NAS of the terminal to the second NAS of the terminal, wherein the second indication includes: an indication of falling back to the second network, and the second NAS corresponds to the second network ; The second NAS of the terminal sends a third indication to the target AS of the terminal, and the third indication triggers the target AS of the terminal to initiate a radio resource control RRC establishment process, where the third indication includes: An indication to fall back to the second network, the third indication further includes: an attach request or a tracking area update TAU request, and the target AS corresponds to the second network; During the RRC establishment process, a fourth indication is sent to the base station through the target AS of the terminal, wherein the fourth indication includes: an indication to fall back to the second network, and the third indication also includes: an attach request message or tracking Area update TAU request message. 30. The device according to claim 29, wherein the triggering module is further configured to receive a response from the network side after sending a third indication to the target AS of the terminal through the second NAS of the terminal. The attach accept message of the attach request or the TAU accept message in response to the TAU request. 31. The device according to claim 30, characterized in that the trigger module is also used for: Establish a PDN connection for IMS services in the second network through the second NAS of the terminal; A response indication is sent to the upper layer of the terminal through the second NAS of the terminal, where the response indication is an indication that the PDN connection or EPS bearer for the IMS service is successfully established. 32. The device according to any one of claims 25 to 31, wherein the upper layer of the terminal includes: IMS sublayer; The triggering module is further configured to notify the IMS sublayer of the terminal through the first NAS of the terminal to wait for a response from the second NAS of the terminal. 33. The device according to any one of claims 24 to 31, wherein the triggering module triggers network reselection to a cell of the second network, including: According to the target information, network reselection to the cell of the second network is triggered. 34. A paging device, characterized in that: A receiving module configured to receive a NAS message sent by the terminal, wherein the NAS message carries second indication information, and the second indication information indicates that the terminal has the ability to support paging messages carrying the first indication information, so The first indication information includes at least one of the following: an indication to fall back to the second network, an indication that the network side supports fallback from the first network to the second network; The second sending module is configured to send a paging message to the terminal, wherein the paging message carries the first indication information. 35. The device according to claim 34, wherein the receiving module is further configured to receive a paging response sent by the terminal, wherein the paging response carries an instruction to fall back to the second network. 36. A terminal, characterized in that it includes a processor and a memory, the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the implementation of claim 1 to the steps of the voice service implementation method described in any one of 19. 37. A network-side device, characterized in that it includes a processor and a memory, the memory stores programs or instructions that can be run on the processor, and when the programs or instructions are executed by the processor, the following are implemented: The steps of the paging method described in any one of claims 20 to 23. 38. A readable storage medium, characterized in that the readable storage medium stores programs or instructions, and when the programs or instructions are executed by a processor, the voice service according to any one of claims 1 to 19 is implemented. Implement the steps of the method, or implement the paging method as described in any one of claims 20 to 23.