CN116801330A

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

Info

Publication number: CN116801330A
Application number: CN202210260524.9A
Authority: CN
Inventors: 康艳超
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2023-09-22

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 and device, terminal and network side equipment

Technical Field

The application belongs to the technical field of wireless communication, and particularly relates to a voice service realization method, a device, a terminal and network side equipment.

Background

After commercial deployment of a fifth generation (5G) network, there may be a scenario in which a fourth generation (fourth generation, 4G) Voice over LTE (VoLTE) service is used to accommodate a calling and called Voice service initiated by a 5G terminal. For example, in early business of 5G networks, some operators might not directly deploy 5G voice services, but use 4G VoLTE services to maximize the role of existing network resources; or, the 5G network has small high-frequency coverage, and a certain number of areas are not covered by the 5G NR network, so that the 4G LTE coverage is also needed to be used for continuing the voice service; alternatively, the capacity of the 5G network is limited, and when the load of the 5G network is high, the operator also wants to transfer the 5G voice service of the user to the 4G network to trigger and execute.

In the above scenario, there is a need for a terminal to initially register with a first network (e.g., a 5G network) and perform related data services, but to be able to fall back into a second network (e.g., a 4G network) to trigger and perform voice services when it is required to perform the voice services (including a caller or a callee). To address this need, a quick and efficient solution is currently being provided.

Disclosure of Invention

The embodiment of the application provides a voice service realization method, a device, a terminal and network side equipment, which can solve the problem of how to quickly fall back to a second network to execute voice service by a terminal residing in a first network.

In a first aspect, a method for implementing a voice service is provided, including: 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.

In a second aspect, a voice service implementation apparatus is provided, including: the triggering module is used for triggering the terminal to perform network reselection to a second network after the target indication is acquired, wherein the terminal resides in the first network; and the execution module is used for executing voice service in the second network.

In a third aspect, a paging method is provided, including: the network side equipment receives NAS information sent by a terminal, wherein the NAS information carries second indication information, the second indication information indicates that the terminal has the capability of supporting paging information carrying first indication information, and the first indication information comprises 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; and the network side equipment sends a paging message to the terminal, wherein the paging message carries first indication information.

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

In a fifth aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, where the processor is configured to implement the steps of the method according to the first aspect, and the communication interface is configured to communicate with an external device.

In a seventh aspect, a network side device is provided, comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method according to the third aspect.

In an eighth aspect, a network side device is provided, which includes a processor and a communication interface, where the processor is configured to implement the steps of the method according to the third aspect, and the communication interface is configured to communicate with an external device.

A ninth aspect provides a voice service implementation system, including: a terminal operable to perform the steps of the method as described in the first aspect, and a network side device operable to perform the steps of the method as described in the third aspect.

In a tenth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method according to the first aspect, or performs the steps of the method according to the third aspect.

In an eleventh aspect, there is provided a chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being for running a program or instructions, implementing the steps of the method according to the first aspect, or implementing the steps of the method according to the third aspect.

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

In the embodiment of the application, after the terminal residing in the first network acquires the target indication, triggering the network reselection to the second network, and then executing the voice service in the second network, so that the terminal residing in the first network can fall back to the second network to execute the voice service, and if the terminal is in an idle state, the terminal does not need to enter a connection state in the first network and fall back to the second network, but directly performs the network reselection, thereby shortening the time delay of the voice service.

Drawings

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

fig. 2 is a schematic flow diagram illustrating a process of implementing voice service by a terminal initially registered in a 5G network falling back to a 4G network;

fig. 3 is a schematic flow chart of a method for implementing voice service according to an embodiment of the present application;

fig. 4 shows a flowchart of a paging method according to an embodiment of the present application;

fig. 5 is a flow chart illustrating a method for implementing a calling voice service in an embodiment of the present application;

fig. 6 is a schematic flow chart of a method for implementing a called voice service according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a voice service implementation device according to an embodiment of the present application;

fig. 8 is a structural flow chart of a paging device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 10 shows a schematic hardware structure of a terminal according to an embodiment of the present application;

fig. 11 shows a schematic hardware structure of a network side device according to an embodiment of the present application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It should be noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may 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 (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a new air interface (NR) system for purposes of example and uses NR terminology in much of the description below, although these techniques are also applicable Applications other than NR systems, e.g. generation 6 (6 ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device and/or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmitting/receiving point (TransmittingReceivingPoint, TRP), or some other suitable terminology in the art, a WLAN access point, a WiFi node, etc., and is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiment of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited. The core network device may include, but is not limited to, at least one of: 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 functions (User Plane Function, UPF), policy control functions (Policy Control Function, PCF), policy and charging rules function units (Policy and Charging Rules Function, PCRF), edge application service discovery functions (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), home subscriber server (Home Subscriber Server, HSS), centralized network configuration (Centralized network configuration, CNC), network storage functions (Network Repository Function, NRF), network opening functions (Network Exposure Function, NEF), local NEF (or L-NEF), binding support functions (Binding Support Function, BSF), application functions (Application Function, AF), and the like. It should be noted that, in the embodiment of the present application, only the core network device in the NR system is described as an example, and the specific type of the core network device is not limited.

For the requirement that a terminal present in some scenarios initially registers with the 5G network and performs related data traffic, but can fall back into the 4G network to trigger and perform voice traffic when it is required to perform voice traffic (including caller or callee), fig. 2 shows one possible solution with which a 5G UE can fall back to 4G and perform VoLTE when it initiates the caller and callee voice traffic. As shown in fig. 2, the solution mainly comprises the following steps:

s201, after the UE registers in 5G, if a calling or called voice service is initiated, a voice service establishment request signaling (IMS SIP signaling) triggers a 5G core network (5G Core Network,5GC) network to establish a 5G QoS identifier (5G QoS Identifier,5QI) =1 QoS flow (flow).

S202, a 5GC Network Function (NF) initiates a QoS flow suggestion request to the NG RAN for requesting to establish a 5 qi=1 QoS flow corresponding air interface tunnel and an N3 tunnel.

S203, the NG RAN receives the QoS flow suggestion request (5qi=1) and triggers a UE handover or redirection procedure for handover or redirection of the UE to the 4G LTE cell.

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

S205, UE switches or redirects to the 4G LTE cell. After the UE accesses the 4G LTE cell, S206a is executed in case of N26 interface deployment, and S206b is executed in case of no N26 interface deployment.

S206a, a tracking area update (Tracking Area update, TAU) procedure performed by the UE, for registration or location update in the 4G network.

S206b, the UE performs attachment (attach) and concurrently establishes a handover attachment (handover attach) type PDN connection procedure.

After the TAU procedure or the attach procedure is finished, the UE re-establishes an IMS packet data network (Packet Data Network, PDN) connection at the 4G network, which is used to transport the UE and IMS network direct signaling.

S207, the evolved packet core network (Evolved Packet Core, EPC) network triggers qci=1 bearer establishment in the 4G network according to IMS signaling, the bearer being used for transmitting VoLTE service user plane data.

S208, the VoLTE calling and called party is established, and normal conversation can be achieved.

For the UE which is in an idle state originally, such as a calling party initiates a 5G voice service, based on the solution, the UE needs to initiate a 5G service request (service request) process to enter a 5G connection state firstly, and then triggers the process steps; for the UE that is in the idle state, for example, as 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, so that it enters the connected state, and then triggers the above procedure steps. It can be seen that, for the UE in idle state, with the above solution, no matter the UE is the calling party or the called party of the voice service, the UE needs to enter the 5G network connection state first, and then enter the 4G through network switching or other modes. This makes the continuous delay for the idle state UE to initiate the 5G voice service long, and the user experience is poor.

The following describes in detail the implementation scheme of the voice service provided by the embodiment of the application through some embodiments and application scenarios thereof with reference to the accompanying drawings.

Fig. 3 shows a schematic flow diagram of a transmission method in an embodiment of the application, and the method 300 may be performed by a terminal. In other words, the method may be performed by software or hardware installed on the terminal. As shown in fig. 3, the method may include the following steps.

And S310, triggering the network reselection to the second network after the terminal residing in the first network acquires the target instruction.

In the 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 limited in the embodiment of the present application.

In an 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 (Evolved Packet System, EPS) network, which may also be referred to as a 4G network or an LTE network.

In the embodiment of the application, the terminal can adopt different wireless access technologies for the first network and the second network.

And S312, the terminal executes voice service in the second network.

In the embodiment of the application, after the terminal residing in the first network acquires the target indication, triggering the network reselection to the second network, and then executing the voice service in the second network, so that the terminal residing in the first network can quickly fall back to the second network to execute the voice service, and if the terminal is in an idle state, the terminal does not need to enter a connection state in the first network and fall back to the second network, but directly performs the network reselection, thereby shortening the time delay of the voice service.

In one possible implementation manner of the embodiment of the present application, the terminal acquisition target indication may acquire, for a first non-access stratum (Non Access Stratum, NAS) of the terminal, a first indication from an upper layer of the terminal, where the first indication includes, but is not limited to, one of the following:

(1) A multimedia telephony service (Multimedia telephone, MMTel) voice call indication;

(2) MMTel voice call start indication;

(3) MMTel video call indication;

(4) MMTel video call start indication;

(5) An indication of signaling related to IMS registration of an uplink IP multimedia subsystem;

(6) An uplink IMS registration related signaling start instruction;

(7) An IP-based short message SMSoIP indication;

(8) SMSoIP start indication.

That is, in the possible implementation manner, after the first NAS of the terminal acquires the first instruction from the upper layer, the network reselection to the second network is triggered. For example, when the terminal initiates the calling procedure, the upper layer sends the first indication to the first NAS of the terminal, and triggers the network reselection to the second network.

Alternatively, the upper layer of the terminal may be an IMS sub-layer.

In one possible implementation, since the first NAS of the terminal determines to trigger network reselection to the second network, in order to make the IMS sublayer aware of the information, after the first NAS of the terminal receives the target indication, the method further includes: the first NAS of the terminal informs the IMS sublayer of the terminal to wait for the response of the second NAS of the terminal. For example, UE 5G NAS interaction with IMS: the UE 5G NAS informs the IMS layer that the UE is to initiate EPS fallback (EPS fallback), so the IMS sub-layer waits for a response of the EPS NAS (i.e., UE LTE NAS).

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

In another possible implementation manner of the embodiment of the present application, the terminal may also receive the first message from the first network for the terminal to obtain the target indication. Alternatively, the first message may be a paging (paging) message. For example, the terminal is used as a called party, and triggers the network reselection to the second network after receiving the paging message sent by the 5G network.

In one possible implementation manner, the first indication information may be carried in the paging message at the network side, where 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. For example, the paging message carries an EPS fallback indication (EPS fallback indication). In this possible implementation manner, the network side may instruct the terminal to fall back to the second network by carrying the first indication information in the paging message or instruct the terminal to support the fall back from the first network to the second network, so that the terminal may trigger the network reselection to the second network according to the first indication information.

In the foregoing possible implementation manner, some terminals may not have the capability of supporting the paging message carrying the indication of falling back to the second network, so, in order to enable the terminal to be consistent with the understanding of the network side, to be able to obtain the indication of falling back to the second network carried in the paging message, in one possible implementation manner, before the first NAS of the terminal receives the first message from the first network, the method may further include: and the terminal sends NAS information to a network side, wherein the NAS information carries second indication information, and the second indication information indicates that the terminal has the capability of supporting paging information carrying the first indication information. Alternatively, 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 that a value of a bit of a 5GMM capability cell in the registration message is set to 1, for indicating that the terminal has the capability of supporting the paging message carrying the first indication information, and a value of the bit is set to 0, for indicating that the terminal does not have the capability of supporting the paging message carrying the first indication information.

In one possible implementation, in order to make the network side learn that the terminal triggers the network to reselect 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. Thus, in this possible implementation, after receiving the paging message, the method may further comprise: the terminal responds to the paging message from the first network and sends a paging response, wherein the paging response carries an indication of falling back to the second network.

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

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

In one possible implementation, in S310, the triggering by the terminal of the network reselection to the second network may include: and triggering the first NAS of the terminal to perform network reselection to a cell of a second network. That is, in this possible implementation, a network reselection may be made to the second network for the first NAS trigger of the terminal.

In one possible implementation, the first NAS trigger for network reselection to the cell of the second network may include:

step 1, a first NAS of the terminal sends a second indication to a second NAS of the terminal, where the second indication includes: an indication of fallback to the second network.

For example, UE LTE NAS. For example, the UE 5G NAS may interact with the UE LTE NAS, and a second indication sent by the UE 5G NAS to the UE LTE NAS may indicate: the UE shall make EPS fallback.

Step 2, the second NAS sends a third indication to a second Access Stratum (AS) of the terminal, and triggers the target AS to initiate a radio resource control (Radio Resource Control, RRC) establishment procedure through the third indication, where the third indication includes: an indication of fallback to the second network, the third indication further comprising: an attach request or a Tracking Area Update (TAU) request.

Wherein the target AS of the terminal corresponds to the second network, e.g. UE LTE AS. . For convenience of distinction, in the following description of the embodiments of the present application, an AS (e.g., UE 5G AS) of the terminal corresponding to the first network is referred to AS a first AS, and a target AS of the terminal is referred to AS a second AS.

Step 3, in the RRC establishment procedure, the second AS of the terminal sends a fourth indication to the base station (e.g., eNB), where the fourth indication includes: an indication of fallback to the second network, the fourth indication further comprising: an attach request message or a tracking area update TAU request message.

For example, after the UE LTE NAS triggers UE LTE AS reselection and discovers an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates an RRC establishment procedure, and optionally, the UE LTE AS may send a fourth indication to the eNB, where the fourth indication includes one of:

-an indication to fall back to the second network (e.g. EPS fallback indication (UE to network));

-attach request (attach request);

-TAU request (TAU request);

-other indication TBD;

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

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

step 1, a second NAS of the terminal establishes PDN connection for IMS service in the second network;

step 2, the second NAS of the terminal sends a response indication to an upper layer (e.g., IMS sublayer) of the terminal, where the response indication: an indication of success of PDN connection or EPS bearer establishment for IMS services.

For example, after the UE performs the LTE connection state, the attach procedure or TAU procedure is completed, and after the PDN connection for the IMS service is successfully established, the UE LTE NAS sends one of the following indications to the IMS layer:

-an indication of a successful PDN connection/EPS bearer establishment for IMS services;

-EPS bearer identification (EPS bearer identity, EBI).

After the second NAS of the terminal sends a response instruction to the upper layer of the terminal, the second NAS of the terminal interacts with the upper layer to realize voice service.

In one possible implementation manner, the triggering, by the terminal, the cell for performing network reselection to the second network may include: and triggering the network reselection to the cell of the second network by the terminal according to the target information.

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

(1) The historical call information of the terminal, wherein the historical call information indicates that the historical voice service of the terminal in the first network is executed by falling back to the second network;

(2) The method comprises the steps of sending first indication information by network side equipment, wherein the first indication information comprises at least one of the following steps: an indication of fallback to the second network, 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 broadcasted by the network side device, or may also be information carried in a paging message of the paging terminal of the network side device, for example, in the foregoing possible implementation manner, the first indication information is carried in the paging message.

(3) And capability information of the terminal, wherein the capability information indicates that the terminal has the capability of falling back to the second network.

Of course, the method is not limited thereto, and in practical application, the terminal may trigger the network reselection to the second network directly after receiving the target instruction, instead of triggering the network reselection to the cell of the second network according to the target information.

According to the technical scheme provided by the embodiment of the application, the UE can acquire the capability information of the network for the voice service to fall back to 4G, and when the UE triggers the calling voice or the called UE voice service, the UE can actively trigger the network to reselect to the 4G cell for acquiring the VoLTE service according to at least one of the capability information of the network side, the capability information of the UE and the historical call information.

In the embodiment of the application, the UE can directly reselect to the 4G cell to directly execute VoLTE service, thereby avoiding the process that the UE enters a connection state in the 5G network and then falls back to the 4G, and further saving certain call delay.

Fig. 4 shows a flowchart of a paging method in an embodiment of the present application, where the method 400 may be performed by a network side device, for example, the network side device may be an access network device or a core network device. In other words, the method may be performed by software or hardware installed on the network-side device. As shown in fig. 4, the method may include the following steps.

S410, the network side equipment receives the NAS message sent by the terminal.

The NAS message carries second indication information, the second indication information indicates that the terminal has the capability of supporting paging messages carrying first indication information, and the first indication information comprises 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. For example, the first indication information may include an EPS fallback indication.

And S412, the network side equipment sends a paging message to the terminal, wherein the paging message carries the first indication information.

In one possible implementation, after S412, the method may further include: and the network side equipment receives a paging response sent by the terminal, wherein the paging response carries an indication of falling 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 one possible implementation, the paging response includes a service request message, and the indication to fall back to the second network is an indication value in a request type cell in the service request message. That is, the value of the request type cell in the service request message transmitted 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 the fallback to the second network may be an EPSfallback cell in the service request message. With this possible implementation, the overhead of signaling can be reduced.

Through the technical scheme provided by the embodiment of the application, the UE can acquire the information of MT voice call and the indication of falling back to 4G of the network through the paging message, so that the UE can directly reselect to the 4G cell to directly acquire VoLTE service, the UE is prevented from entering a connection state in the 5G network and then falling back to 4G, and a certain call delay can be saved.

The technical scheme provided by the embodiment of the application is described below by taking the 5G UE in an idle state as a called party or a calling party of voice service as an example.

In the embodiment of the application, the NG RAN or the AMF may send first capability indication information to the UE, where 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. The voice service by the 5G UE may include the following steps.

Step 1. The ue 5gnas decides to reselect LTE according to the following indication, and executes EPS fallback, where the indication is one of the following forms:

the indication of the UE IMS sublayer may include one of:

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

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

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

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

(II) indication of the network side, may include one of:

-paging message+system broadcast SIB (EPS fallback indication is included in SIB);

A paging message (which carries an indication of EPS fallback). In this case, the UE carries in a previously sent NAS message (e.g., registration message) a paging message (paging indication for EPS fallback) capability indication indicating that the terminal has an indication to support carrying EPS fallback, or other similar indication.

Step 2, after the UE 5G NAS (for example, may be a 5 GMM) receives the upper layer instruction in step 1, it is determined that the procedure of entering the 5G connection state is not initiated, but the UE actively triggers the idle state to reselect to LTE according to the following conditions:

UE history call information (UE history call information indicates that UE history calls are all voice calls acquired by EPS fallback);

-UE 5G AS provided information, for example: system broadcast (the system broadcast indicates that the network supports enhanced EPS fallback).

Optionally, for calling voice traffic, the UE 5G NAS may interact with IMS: the UE 5G NAS informs the IMS layer that the UE is to initiate EPS fallback, so the IMS layer waits for a response of EPS NAS (UE LTE NAS).

Step 3, UE 5g NAS (e.g., 5 GMM) interacts with UE LTE NAS (e.g., EMM), and the indication sent by 5GMM to EMM may indicate:

the UE is to make EPS fallback.

In step 4, after the UE LTE NAS (e.g. EMM) triggers UE LTE AS reselection and discovers an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates an RRC establishment procedure, and optionally, the UE LTE AS may send an indication to the network eNB, 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 connection state and completes an attach procedure or a TAU procedure, and after a PDN connection for an IMS service is successfully established, the UE LTE NAS sends one of the following indications to the IMS layer:

-a PDN connection/EPS bearer establishment for IMS services is successful;

-EBI。

and 6, the LTE NAS and the IMS layer interact to realize voice service.

The technical scheme provided by the embodiment of the application is explained below by taking calling voice service as an example through interaction of all layers in the UE.

Fig. 5 is a flow chart of a method for implementing a calling voice service according to an embodiment of the present application, and as shown in fig. 5, the method mainly includes the following steps.

S501, the UE needs to initiate an MO call, and the IMS sublayer sends a related indication to the UE 5G NAS layer, where the related indication 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 upper layers；

-(start of)SMSoIP from the upper layer。

s502, after receiving the upper layer instruction in 1, the UE 5G NAS (5 GMM in the figure) decides not to initiate a procedure of entering the 5G connection state, but the UE actively triggers the idle state to reselect to LTE according to the following conditions:

Optionally, the method may further include S502a, UE 5G NAS interaction with IMS: the UE 5G NAS informs the IM sub-S layer that the UE is to initiate EPS fallback, and therefore the IMs sub-layer waits for a response from the EPS NAS (i.e. UE LTE NAS). Normally, the UE 5G NAS should directly establish the related PDU session after receiving the above indication of the IMS sublayer, and/or, the QoS flows (QoS flow for IMS signaling, MMTEL voice, MMTEL video or smoip) of the IMS signal, MMTEL video or SMSoIP, and feed back the establishment success message to the IMS layer, however, since the UE 5G NAS determines to fall back to the EPS, the UE 5G NAS notifies the IMS sublayer to wait for the response of the EPS NAS (UE LTE NAS).

S503, the UE 5G NAS (5 GMM in the figure) interacts with the UE LTE NAS (EMM in the figure), and the indication sent by the 5GMM to the EMM may indicate:

the UE is to make EPS fallback.

S504.UE LTE NAS (EMM in the figure) triggers UE LTE AS reselection, after finding an allowed or suitable cell (allowed cell or suitable cell), UE LTE AS initiates RRC setup procedure. Optionally, during RRC establishment, the UE LTE AS may send an indication to the network eNB, including one of:

EPS fallback indication (UE to network);

-attach request；

-TAU request。

s505.lte NAS receives an attach accept message (attach accept) of the network side in response to the attach request or a TAU accept message (TAU accept) in response to the TAU request. Interaction of lte NAS and IMS layers. Specifically, as shown in fig. 5, the following S506a, S506b, S506c, and S506d may be included.

S506a, EMM informs ESM MM connection establishment.

S506b, the EMM informs the IMS sub-layer that the UE is registered with the EPS.

S506c, the EMM informs ESM layer of bearing status (bearer status) information.

S506d, after the UE enters the LTE connection state, completing an attach procedure or a TAU procedure, and after successfully establishing a PDN connection for an IMS service, the UE LTE NAS sends one of the following indications to the IMS sub-layer:

-an indication of success of PDN connection or EPS bearer (bearer) establishment for IMS traffic;

-EBI。

according to the technical scheme provided by the embodiment of the application, when the UE triggers the calling voice service, the UE can trigger to reselect the network to the 4G cell for acquiring the VoLTE service according to at least one of the capability information of the network side, the history call information and the capability information of the UE. The UE is prevented from entering a connection state in the 5G network and then falling back to the 4G network, so that a certain call delay can be saved.

The technical scheme provided by the embodiment of the application is described below by taking the called voice service as an example through interaction of all layers in the UE.

Fig. 6 is a flow chart illustrating a method for implementing a called voice service in an embodiment of the present application, and as shown in fig. 6, the method mainly includes the following steps.

S601, the UE receives an indication of the network, wherein the indication is one of the following:

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

a paging message (carrying an indication of EPS fallback) in which case the UE carries a paging message (paging indication for EPS fallback) capability indication indicating that the terminal has an indication to support carrying EPS fallback, or similar other indication, in a previously sent NAS message (e.g. registration message).

S602, after receiving the upper layer instruction in S601, the UE 5G NAS (5 GMM in the drawing) decides not to initiate a procedure of entering the 5G connection state, but the UE actively triggers the idle state to reselect to LTE according to the following conditions:

-UE 5G AS provided information, for example: system broadcasting (the system broadcasting indicates that the network supports enhanced EPS fallback);

Optionally, the method may further include S602a, UE 5G NAS interaction with IMS: the UE 5G NAS informs the IMS layer that the UE is to initiate EPS fallback, so the IMS sub-layer waits for a response of EPS NAS (UE LTE NAS). Normally, the UE 5G NAS should directly establish the related PDU session after receiving the indication in S601, and/or, the IMS signal, MMTEL voice, MMTEL video or QoS flow of smoip (QoS flow for IMS signaling, MMTEL voice, MMTEL video, SMSoIP), and feed back the establishment success message to the IMS layer, however, since the UE 5G NAS determines to drop back to the EPS, the UE 5G NAS notifies the IMS sub-layer to wait for the response of the EPS NAS (UE LTE NAS).

In addition, as shown in fig. 6, the method may further include: s602b, the UE 5G NAS responds to paging of the first network and sends a paging response to the 5GS, wherein the paging response carries an EPS fallback indication.

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

S603, the UE 5G NAS (5 GMM in the figure) interacts with the UE LTE NAS (EMM in the figure), and the indication sent by the 5GMM to the EMM may indicate:

the UE is to make EPS fallback.

S604.UE LTE NAS (EMM in the figure) triggers UE LTE AS reselection, after finding an allowed or suitable cell (allowed cell or suitable cell), UE LTE AS initiates RRC setup procedure. Optionally, during RRC establishment, the UE LTE AS may send an indication to the network eNB, including one of:

EPS fallback indication (UE to network);

-attach request；

-TAU request。

s605.lte NAS receives an attach accept message (attach accept) of the network side in response to the attach request or a TAU accept message (TAU accept) in response to the TAU request.

S606. Interaction of lte NAS and IMS layers. Specifically, as shown in fig. 6, the following S606a, S606b, S606c, and S606d may be included.

S606a, EMM informs ESM MM connection establishment.

S606b, EMM informs IMS sub-layer UE to register with EPS.

S606c, EMM informs ESM layer bearer status (bearer status) information.

S606d, after the UE enters the LTE connected state, completing the attach procedure or TAU procedure, and after successfully establishing a PDN connection for IMS services, the UE LTE NAS sends one of the following indications to the IMS sub-layer:

-EBI。

According to the technical scheme provided by the embodiment of the application, when the UE triggers the called voice service, the UE can trigger to reselect the network to the 4G cell for triggering the VoLTE service according to at least one of the capability information of the network side, the historical call information and the capability information of the UE. The UE is prevented from entering a connection state in the 5G network and then falling back to the 4G network, so that a certain call delay can be saved.

According to the voice service implementation method provided by the embodiment of the application, the execution main body can be a voice service implementation device. In the embodiment of the application, a method for implementing voice service by using a voice service implementing device is taken as an example, and the voice service implementing device provided by the embodiment of the application is described.

Fig. 7 shows a schematic structural diagram of a voice service implementation apparatus according to an embodiment of the present application, and as shown in fig. 7, the apparatus 700 mainly includes: a trigger module 701 and an execution module 702.

In the embodiment of the present application, a triggering module 701 is configured to trigger a terminal to perform network reselection to a second network after obtaining a target indication, where the terminal resides in a first network; an execution module 702 is configured to execute a voice service in the second network.

In one possible implementation, the triggering module 701 obtains the target indication includes one of:

Acquiring, by a first non-access stratum, NAS, of the terminal, a first indication from an upper layer of the terminal, where the first NAS of the terminal corresponds to the first network:

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

In one possible implementation manner, the paging message carries first indication information, where 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; as shown in fig. 7, the apparatus further includes: a first sending module 703, configured to send a NAS message to a network side, where the NAS message carries second indication information, and the second indication information indicates that the terminal has a capability of supporting a paging message carrying the first indication information.

In one possible implementation, as shown in fig. 7, the apparatus may further include: and the response module 703 is configured to respond to the paging message from the first network and send a paging response, where the paging response carries an indication that the paging message falls back to the second network.

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

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

sending, by the first NAS of the terminal, a second indication to a second NAS of the terminal, where the second indication includes: an indication of fallback to a second network, the second NAS corresponding to the second network;

sending a third instruction to a target AS of the terminal through a second NAS of the terminal, and triggering the target AS of the terminal to initiate a Radio Resource Control (RRC) establishment process through the third instruction, wherein the third instruction comprises: an indication of fallback to the second network, the third indication further comprising: an attach request or a tracking area update TAU request, the target AS corresponding to the second network;

in the RRC establishment process, sending a fourth indication to the base station by the target AS of the terminal, wherein the fourth indication comprises: an indication of fallback to the second network, the third indication further comprising: an attach request message or a tracking area update TAU request message.

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

In one possible implementation, the triggering module 701 is further configured to:

establishing a PDN connection for IMS service in the second network through a second NAS of the terminal;

sending a response instruction to an upper layer of the terminal through a second NAS of the terminal, wherein the response instruction is as follows: an indication of success of PDN connection or EPS bearer establishment for IMS services.

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

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

In one possible implementation manner, the triggering module 701 triggers a network reselection to a cell of the second network, including: triggering the network to reselect to the cell of the second network according to the target information.

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

the historical call information of the terminal, wherein the historical call information indicates that the historical voice service of the terminal in the first network is executed by falling back to the second network;

the method comprises the steps of sending first indication information by network side equipment, wherein the first indication information comprises at least one of the following steps: an indication of fallback to the second network, an indication that the network side supports fallback from the first network to the second network;

And capability information of the terminal, wherein the capability information indicates that the terminal has the capability of falling back to the second network.

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

system information broadcast by network side equipment; or alternatively, the process may be performed,

the network side equipment pages the information carried in the paging message of the terminal.

In one possible implementation, the first network comprises a 5G network and the second network comprises an evolved packet system EPS network.

In one possible implementation, the indication of fallback to the second network comprises an EPS fallback indication.

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

The voice service implementation device provided by the embodiment of the present application can implement each process implemented by the terminal in the method embodiments of fig. 3 to fig. 6, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted here.

According to the paging method provided by the embodiment of the application, the execution main body can be a paging device. In the embodiment of the application, the paging device executes the paging method as an example, and the paging device provided by the embodiment of the application is described.

Fig. 8 shows a schematic structural diagram of a paging device according to an embodiment of the present application, and as shown in fig. 8, the device 800 mainly includes: a receiving module 801 and a second transmitting module 802.

In the embodiment of the present application, a receiving module 801 is configured to receive a NAS message sent by a terminal, where the NAS message carries second indication information, and the second indication information indicates that the terminal has a capability of supporting a paging message carrying first indication information, and 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; and a second sending module 802, configured to send a paging message to the terminal, where the paging message carries first indication information.

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

The paging device in the embodiment of the application can be an electronic device, for example, an electronic device with an operating system, or can be a component in the electronic device, for example, an integrated circuit or a chip. The electronic device may be a network-side device or may be another device other than a terminal. By way of example, the network-side devices may include, but are not limited to, the types of network-side devices 12 listed above, and the other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the present application are not limited in detail.

The paging device provided by the embodiment of the present application can implement each process implemented by the network side device in the method embodiments of fig. 3 to fig. 6, and achieve the same technical effects, and for avoiding repetition, a detailed description is omitted here.

Optionally, as shown in fig. 9, the embodiment of the present application further provides a communication device 900, including a processor 901 and a memory 902, where the memory 902 stores a program or instructions that can be executed on the processor 901, for example, when the communication device 900 is a terminal, the program or instructions implement the steps of the foregoing embodiment of the voice service implementation method when executed by the processor 901, and achieve the same technical effects. When the communication device 900 is a network side device, the program or the instruction, when executed by the processor 901, implements the steps of the foregoing paging method embodiment, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal which comprises a processor and a communication interface, wherein the processor is used for realizing the steps of the voice service realization method embodiment, and the communication interface is used for communicating with external equipment. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 10 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

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

Those skilled in the art will appreciate that terminal 1000 can also include a power source (e.g., a battery) for powering the various components, which can be logically connected to processor 1010 by a power management system so as to perform functions such as managing charge, discharge, and power consumption by the power management system. The terminal structure shown in fig. 10 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 1004 may include a graphics processing unit (Graphics Processing Unit, GPU) 10041 and a microphone 10042, where the graphics processor 10041 processes image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 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. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 1001 may transmit the downlink data to the processor 1010 for processing; in addition, the radio frequency unit 1001 may send uplink data to the network side device. In general, 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, and the like.

The memory 1009 may be used to store software programs or instructions and various data. The memory 1009 may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 1009 may include volatile memory or nonvolatile memory, or the memory 1009 may include both volatile and nonvolatile memory. The non-volatile memory may be a Read-only memory (ROM), a programmable Read-only memory (ProgrammableROM, PROM), an erasable programmable Read-only memory (ErasablePROM, EPROM), an electrically erasable programmable Read-only memory (ElectricallyEPROM, EEPROM), or a flash memory, among others. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 1009 in embodiments of the 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 that primarily processes operations involving an operating system, user interface, application programs, and the like, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.

The processor 1010 is configured to trigger the terminal to perform network reselection to a second network after the target indication is acquired, where the terminal resides in the first network; and executing voice service in the second network.

The embodiment of the application also provides network side equipment which comprises a processor and a communication interface, wherein the processor is used for realizing the steps of the paging method embodiment, and the communication interface is used for communicating with external equipment. The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 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 a radio frequency device 1102. In the uplink direction, the radio frequency device 1102 receives information via the antenna 1101, and transmits the received information to the baseband device 1103 for processing. In the downlink direction, the baseband device 1103 processes information to be transmitted, and transmits the processed information to the radio frequency device 1102, and the radio frequency device 1102 processes the received information and transmits the processed information through the antenna 1101.

The method performed by the network-side device in the above embodiment may be implemented in the baseband apparatus 1103, where the baseband apparatus 1103 includes a baseband processor.

The baseband apparatus 1103 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 11, where one chip, for example, a baseband processor, is connected to the memory 1105 through a bus interface, so as to call a program in the memory 1105 to perform the network device operation shown in the above method embodiment.

The network-side device may also include a network interface 1106, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network side device 1100 of the embodiment of the present application further includes: instructions or programs stored in the memory 1105 and executable on the processor 1104, the processor 1104 invokes the instructions or programs in the memory 1105 to perform the method performed by the modules shown in fig. 8 and achieve the same technical effects, so repetition is avoided and will not be described here.

The embodiment of the present application also provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and the program or the instruction when executed by a processor implements each process of the foregoing embodiment of the voice service implementation method, or implements each process of the foregoing embodiment of the paging method, and the same technical effect can be achieved, so that repetition is avoided, and details are not repeated here.

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

The embodiment of the application further provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the processes of the embodiment of the voice service implementation method or the processes of the embodiment of the paging method, and can achieve the same technical effects, so that repetition is avoided, and no redundant description is provided here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement each process of the foregoing embodiments of the voice service implementation method, or implement each process of the foregoing embodiments of the paging method, and achieve the same technical effects, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a voice service realization system, which comprises: the terminal can be used for executing the steps of the voice service implementation method, and the network side equipment can be used for executing the steps of the paging method.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods 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.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A method for implementing voice service, comprising:

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.

2. The method of claim 1, wherein the terminal obtaining the target indication comprises one of:

a first non-access stratum (NAS) of the terminal acquires a first indication from an 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 comprises one of:

a multimedia telephony service MMTel voice call indication;

MMTel voice call start indication;

MMTel video call indication;

MMTel video call start indication;

an indication of signaling related to IMS registration of an uplink IP multimedia subsystem;

an uplink IMS registration related signaling start instruction;

an IP-based short message SMSoIP indication;

SMSoIP start indication.

4. The method of claim 2, wherein the first message comprises: paging messages for paging the terminal.

5. The method of claim 4, wherein the paging message carries first indication information, and wherein the first indication information includes at least one of: an indication of fallback to the second network, an indication that the network side supports fallback from the first network to the second network.

6. The method according to claim 4, wherein the method further comprises: the terminal responds to the paging message from the first network and sends a paging response, wherein the paging response carries an indication of falling back to the second network.

7. The method of claim 6, wherein the page response comprises a service request message, and wherein the indication to drop back to the second network is an indication value in a request type cell in the service request message.

8. The method of claim 5, wherein prior to the terminal receiving the first message from the first network, the method further comprises:

and the terminal sends NAS information to a network side, wherein the NAS information carries second indication information, and the second indication information indicates that the terminal has the capability of supporting paging information carrying the first indication information.

9. The method of claim 2, wherein the terminal triggering the network reselection to the second network comprises:

and triggering the first NAS of the terminal to perform network reselection to a cell of a second network.

10. The method of claim 9, wherein the first NAS trigger of the terminal performs network reselection to a cell of a second network, comprising:

the first NAS of the terminal sends a second indication to a second NAS of the terminal, wherein the second indication comprises: an indication of fallback to a second network, a second NAS of the terminal corresponding to the second network;

the second NAS of the terminal sends a third instruction to a 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 instruction, wherein the third instruction comprises: an indication of fallback to the second network, the third indication further comprising: an attach request or a tracking area update TAU request, the target AS of the terminal corresponding to the second network;

in the RRC establishment procedure, the target AS of the terminal sends a fourth indication to the base station, where the fourth indication includes: an indication of fallback to the second network, the fourth indication further comprising: an attach request message or a TAU request message.

11. The method of claim 10, wherein after the second NAS of the terminal sends the third indication to the second access AS of the terminal, the method further comprises:

and the second NAS of the terminal receives an attach accept message of the network side responding to the attach request or a TAU accept message responding to the TAU request.

12. The method of claim 11, wherein after the second NAS of the terminal receives the attach accept message of the network side in response to the attach request or the TAU accept message of the TAU request, the method further comprises:

a second NAS of the terminal establishes PDN connection for IMS service in the second network;

the second NAS of the terminal sends a response instruction to an upper layer of the terminal, wherein the response instruction is as follows: an indication of success of PDN connection or EPS bearer establishment for IMS services.

13. The method according to any of the claims 2 to 12, characterized in that the upper layer of the terminal comprises: IMS sublayers.

14. The method of claim 13, wherein after the first NAS of the terminal obtains the first indication from the upper layer of the terminal, the method further comprises:

The first NAS of the terminal informs the IMS sublayer of the terminal to wait for the response of the second NAS of the terminal.

15. The method according to any of the claims 1 to 12, wherein the terminal triggers a network reselection to a cell of a second network, comprising:

and triggering the network reselection to the cell of the second network by the terminal according to the target information.

16. The method of claim 15, wherein the target information comprises at least one of:

17. The method of claim 16, wherein the first indication information sent by the network side device includes:

18. The method of any of claims 1 to 12, wherein the first network comprises a 5G network and the second network comprises an evolved packet system, EPS, network.

19. The method according to any of claims 6, 7 and 10, wherein the indication of fallback to the second network comprises an EPS fallback indication.

20. A paging method, comprising:

the network side equipment receives NAS information sent by a terminal, wherein the NAS information carries second indication information, the second indication information indicates that the terminal has the capability of supporting paging information carrying first indication information, and the first indication information comprises 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;

and the network side equipment sends a paging message to the terminal, wherein the paging message carries first indication information.

21. The method according to claim 20, wherein after the network side device sends the paging message to the terminal, the method further comprises:

And the network side equipment receives a paging response sent by the terminal, wherein the paging response carries an indication of falling back to the second network.

22. The method of claim 21, wherein the page response comprises a service request message, and wherein the indication of fallback to the second network is an indication value in a request type cell in the service request message.

23. The method of any of claims 20 to 22, wherein the indication of fallback to the second network comprises an EPS fallback indication.

24. A voice service implementing apparatus, comprising:

the triggering module is used for triggering the terminal to perform network reselection to a second network after the target indication is acquired, wherein the terminal resides in the first network;

and the execution module is used for executing voice service in the second network.

25. The apparatus of claim 24, wherein the triggering module to obtain the target indication comprises one of:

26. The apparatus of claim 25, wherein the paging message carries first indication information, the first indication information comprising at least one of: 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 apparatus further comprises:

the first sending module is used for sending NAS information to a network side, wherein the NAS information carries second indication information, and the second indication information indicates that the terminal has the capability of supporting paging information carrying the first indication information.

27. The apparatus as recited in claim 25, further comprising: and the response module is used for responding to the paging message from the first network and sending a paging response, wherein the paging response carries an indication of falling back to the second network.

28. The apparatus of claim 25, wherein the triggering module triggering a network reselection to a second network comprises: and performing network reselection to a cell of a second network through the first NAS trigger of the terminal.

29. The apparatus of claim 28, wherein the triggering module triggers network reselection to a cell of a second network via a first NAS of the terminal, comprising:

30. The apparatus of claim 29, wherein the triggering module is further configured to receive an attach accept message of the network side in response to the attach request or a TAU accept message of the TAU request after sending a third indication to a target AS of the terminal through a second NAS of the terminal.

31. The apparatus of claim 30, wherein the trigger module is further configured to:

32. The apparatus according to any one of claims 25 to 31, wherein an upper layer of the terminal comprises: an IMS sublayer;

the triggering module is further configured to notify, through the first NAS of the terminal, an IMS sublayer of the terminal to wait for a response of the second NAS of the terminal.

33. The apparatus according to any one of claims 24 to 31, wherein the triggering module triggers a network reselection to a cell of a second network, comprising:

triggering the network to reselect to the cell of the second network according to the target information.

34. A paging device is characterized in that,

the receiving module is used for receiving NAS information sent by the terminal, wherein the NAS information carries second indication information, the second indication information indicates that the terminal has the capability of supporting paging information carrying first indication information, and the first indication information comprises 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;

And the second sending module is used for sending a paging message to the terminal, wherein the paging message carries the first indication information.

35. The apparatus of claim 34, wherein the receiving module is further configured to receive a paging response sent by the terminal, where the paging response carries an indication of a fallback to the second network.

36. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the voice service implementation method of any of claims 1 to 19.

37. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the paging method of any one of claims 20 to 23.

38. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the voice service implementation method according to any of claims 1 to 19 or the steps of the paging method according to any of claims 20 to 23.