CN116801328A

CN116801328A - Method, device and terminal for realizing voice service

Info

Publication number: CN116801328A
Application number: CN202210259551.4A
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 method, a device and a terminal for realizing voice service, which belong to the field of wireless communication, and the method for realizing voice service in the embodiment of the application comprises the following steps: after a first access layer AS of a terminal residing in a first network acquires a target instruction, triggering the terminal to reselect to a second network; and the terminal executes voice service through the second network.

Description

Method, device and terminal for realizing voice service

Technical Field

The application belongs to the technical field of wireless communication, and particularly relates to a method, a device and a terminal for realizing voice service.

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 method, a device and a terminal for realizing voice service, which can solve the problem of how to quickly fall back to a second network to execute voice service when the terminal residing in a first network.

In a first aspect, a method for implementing a voice service is provided, including: after a first access layer AS of a terminal residing in a first network acquires a target instruction, triggering the terminal to reselect to a second network, wherein the first AS of the terminal corresponds to the first network; and the terminal executes voice service through the second network.

In a second aspect, a device for implementing a voice service is provided, where the device is applied to a terminal, and the device includes: the determining module is used for triggering the terminal to reselect to the second network through the first AS of the terminal after the target indication is acquired through the first AS of the terminal residing in the first network, wherein the first AS of the terminal corresponds to the first network; and the execution module is used for executing voice service through the second network.

In a third 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 fourth aspect, a terminal is provided, comprising a processor and a communication interface, wherein 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 fifth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor realizes the steps of the method according to the first aspect.

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

In a seventh 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 carry out the steps of the method according to the first aspect.

In the embodiment of the application, after the first AS of the terminal residing in the first network acquires the target indication, determining to fall back to the second network, triggering the terminal to reselect to the second network, and then executing the voice service through the second network by the terminal, so that the terminal residing in the first network can fall back to the second network to execute the voice service quickly, 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 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 a voice service according to an embodiment of the present application;

fig. 4 is a flow chart illustrating a method for implementing a calling voice service in an embodiment of the present application;

fig. 5 shows a schematic structural diagram of a device for implementing a voice service according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

Fig. 7 shows a schematic hardware structure of a terminal 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 that follows, but these techniques are also applicable to applications other than NR system applications, such as 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: a core network node, a core network function, a mobility management entity (Mobility Management Entity, MME), an access mobility management function (Access and Mobility Management Function, AMF), a session management function (Session Management Function, SMF), a user plane function (User Plane Function, UPF), a policy control function (Policy Control Function, PCF), a policy and charging rules function (Policy and Charging Rules Function, PCRF), an edge application service discovery function (EdgeApplicationServerDiscoveryFunction, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), a home subscriber server (Home Subscriber Server, HSS), a centralized network configuration (Centralized network configuration, CNC), a network storage function (Network Repository Function, NRF), a network opening function (NetworkExposureFunction, NEF), a local NEF (LocalNEF, or L-NEF), a binding support function (Binding Support Function, BSF), an application function (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 implementation scheme of the voice service provided by the embodiment of the application is described in detail below through some embodiments and application scenes 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.

S310, a first Access Stratum (AS) of a terminal residing in a first network acquires a target indication, and triggers the terminal to reselect to a second network.

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. The radio access technologies used by the first network and the second network are different.

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 access technologies for the first network and the second network.

In the embodiment of the present application, the first AS of the terminal corresponds to the first network, and optionally, the first AS of the terminal is an AS corresponding to the first network in the terminal, for example, a 5G AS of the terminal, i.e. a UE 5G AS.

In one possible implementation of the embodiment of the present application, the first AS of the terminal may obtain the target indication from the first non-receiving layer (Non Access Stratum, NAS) of the terminal for the first AS of the terminal.

Optionally, the target indication is for indicating one of:

the reason for the establishment is an upstream voice call (mo-VoiceCall) and the access type (AccessCategory, AC) is 4;

the reason for this is that the upstream video call (mo-VideoCall) AC is 5;

the reason for this is upstream Data (mo-Data) and AC is 9;

the reason for this is upstream short message (mo-SMS) and AC is 6.

In one possible implementation, the first NAS may send the target indication to the first AS after acquiring the indication sent from the upper layer of the terminal. Thus, in this possible implementation, before the first AS of the terminal obtains the target indication sent by the first NAS of the terminal, the method further includes: the first NAS of the terminal obtains a first indication from an upper layer of the terminal.

Optionally, the first indication comprises one of:

(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 uplink IMS registration related signaling indication;

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

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

(8) SMSoIP start indication.

In the embodiment of the present application, the first NAS of the terminal corresponds to a first network, and optionally, the first NAS of the terminal is a NAS corresponding to the first network in the terminal, for example, a 5G NAS of the terminal, that is, a UE 5G NAS, and further may be a 5GMM or a 5GSM.

In one possible implementation, the upper layer of the terminal may be an IMS sub-layer of the terminal. For example, when the terminal initiates a calling voice service, the IMS sub-layer of the terminal may send an indication of one of the above depending on the type of calling voice service initiated.

In one possible implementation, after the first AS of the terminal obtains the target indication, it may determine that the terminal needs to fall back to the second network, thereby triggering the terminal to reselect to the second network.

In one possible implementation, since the first AS of the terminal determines to fall back to the second network, in order to enable the first NAS of the terminal to learn the information, after the first AS of the terminal receives the target indication sent by the first non-access NAS of the terminal, the method may further include: the first AS of the terminal sends acknowledgement information to the first NAS of the terminal, wherein the acknowledgement information comprises: an indication of fallback to the second network. For example, the UE 5G AS sends an ACK to the 5GMM indicating that the UE is to make an EPS fallback.

Normally, the first NAS of the terminal should directly establish the related PDU session after receiving the above indication of the IMS sublayer, and/or, the QoS flow (QoS flow for IMS signaling, MMTEL voice, MMTEL video or SMSoIP) of the IMS signal, MMTEL video or SMSoIP, and feed back the establishment success message to the IMS sublayer, however, since the first NAS of the terminal receives the indication of the first AS of the terminal, it determines that the terminal is going to fall back to the EPS, the first NAS of the terminal may notify the IMS sublayer to wait for the response of the second NAS of the terminal (e.g., EPS NAS). Thus, in one possible implementation, after the first AS of the terminal sends the acknowledgement information to the first NAS of the terminal, the method further includes: and the first NAS of the terminal receives the confirmation information and notifies 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 sublayer that the UE is to initiate EPS fallback, so the IMS sublayer waits for a response by the EPS NAS.

In one possible implementation, the triggering, by the first AS of the terminal, the reselection of the terminal to the second network may include: and triggering the terminal to reselect to the second network by the first AS of 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. Alternatively, the first indication information may be system information broadcasted by the network side device. Optionally, before the first AS of the terminal receives the target indication, the method may further include: the terminal receives broadcasted system information, wherein the system information carries the first indication information.

(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 first AS of the terminal may directly determine to fall back to the second network after obtaining the target indication, that is, the first AS determines to execute the uplink voice service of the first network to fall back to the second network, instead of determining to fall back to the second network according to the target information.

In the embodiment of the application, the first AS of the terminal can send the instruction to the second AS of the terminal, so that the second AS of the terminal informs the second NAS trigger of the terminal to reselect to the second network. Thus, in one possible implementation, S312 may include:

step 1, a first AS of the terminal sends a second indication to a second AS of the terminal, wherein the second indication comprises one of the following steps: an indication to fall back to the second network (e.g., an indication of EPS fallback), an indication to redirect to the second network.

For example, the UE 5G AS interacts with the UE LTE AS, and the indication sent by the UE 5G AS to the UE LTE AS may be one of: the UE is to make an indication of EPS fallback, an indication of redirection to LTE.

And step 2, the second AS of the terminal informs the second NAS of the terminal to trigger reselection to a second network.

The second NAS of the terminal and the second AS of the terminal correspond to a second network, and optionally, the second NAS of the terminal and the second AS of the terminal may be NAS and AS corresponding to the second network, for example, the second NAS of the terminal is an LTE NAS of the terminal, or is an EMM, and the second AS of the terminal is an LTE AS of the terminal.

In one possible implementation, the notifying, by the second AS of the terminal, the second NAS trigger reselection of the terminal to the second network may include:

step 1, a second AS of the terminal sends a notification message to a second NAS of the terminal, wherein the notification message carries an indication of falling back to a second network.

For example, the UE LTE AS may inform the UE that EMM needs EPS fallback.

Step 2, the second NAS of the terminal sends a third indication to the second AS of the terminal, where the third indication includes: an attach request or a TAU request.

Step 3, the second AS of the terminal initiates a radio resource control (Radio Resource Control, RRC) establishment procedure, in which the second AS of the terminal sends a fourth indication to a base station (e.g., eNB), wherein the fourth indication includes: an indication to fall back to the second network, the fourth indication further comprising: an attach request message or a TAU request message.

For example, after triggering UE LTE cell selection and reselection, and discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates an RRC establishment procedure, optionally in which the UE LTE AS may send an indication of one of the following to a base station (e.g., eNB):

EPS fallback indication (UE to network);

-attach request；

-TAU request。

in one possible implementation, after the second AS of the terminal sends the fourth indication to the base station in the RRC establishment procedure, the network side may return a response to the terminal, so 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 responding to the attach request or a TAU accept message responding to the TAU request.

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 instruction to the IMS sublayer of the terminal, where the response instruction: 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).

In one possible implementation, the second AS of the terminal may initiate the RRC establishment procedure after receiving an attach request or TAU request sent by the second NAS of the terminal. I.e. the second AS of the terminal may initiate an RRC establishment procedure under the triggering of the second NAS of the terminal.

Alternatively, in another possible implementation, the second AS of the terminal may initiate the RRC establishment procedure while sending a notification to the second NAS of the terminal. Since the second AS of the terminal knows that it will fall back to the second network when sending the notification to the second NAS of the terminal, the second AS of the terminal can initiate the RRC establishment procedure at the same time, so AS to save time.

S312, the terminal executes voice service through the second network.

For example, after a PDN connection establishment for an IMS service is successful, the second NAS of the terminal may interact with the IMS sub-layer, thereby performing a voice service.

According to the technical scheme provided by the embodiment of the application, when the UE triggers the calling voice service, the first AS of the UE can determine to fall back to the second network according to at least one of the capability information of the network side, the own capability information and the historical call information, and actively trigger the terminal to reselect to the second network, so that the terminal residing in the first network can fall back to the second network quickly to execute the voice service.

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

The technical scheme provided by the embodiment of the application is described below by taking the example that the 5G UE is in an idle state and executes the calling voice service.

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 needs to initiate an MO call, the IMS sub-layer sends a related indication to the UE 5G NAS layer, where the related indication may be one of the following:

-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).

In step 2, after the UE 5G NAS (e.g., may be a 5 GMM) receives the upper layer instruction in step 1, the UE 5G NAS requests the 5G AS to enter a connected state, and the UE 5G NAS (e.g., the 5 GMM) interacts with the UE 5G AS, where the instruction sent by the 5GMM to the 5G AS may include one of the following:

-mo-VoiceCall----------4(AC)

-mo-VideoCall---------5(AC)

-mo-Data---------------9(AC)

-mo-SMS--------------6(AC)

step 3, the UE 5G AS decides to reselect to the LTE AS according to at least one of a system broadcast message (for example, the system broadcast message may carry an EPS fallback instruction or an instruction that the network side supports dropping from the 5G network to the LTE network), a NAS layer instruction, UE capability, and UE history call information, and executes the EPS fallback.

Optionally, in step 3, the 5G AS may send an ACK to the 5GMM, where the ACK may indicate that the UE is to perform EPS fallback.

Optionally, in step 3, the UE 5G NAS may also interact with IMS: the UE 5G NAS informs the IMS sublayer that the UE is to initiate EPS fallback, so the IMS sublayer waits for a response by the EPS NAS.

Step 4, UE 5G AS interacts with UE LTE AS, and the indication sent by 5G AS to LTE AS may indicate one of the following:

-the UE is to perform EPS fallback;

redirect to LTE (redirect to LTE).

In step 5, the UE LTE AS informs the UE EMM that EPS fallback is to be performed, and the UE EMM sends an attach request (attach request) or a TAU request (request) to the UE LTE AS. Optionally, UE LTE AS synchronization triggers UE LTE cell selection and reselection.

Step 6, after triggering UE LTE cell selection and reselection by the UE LTE AS and discovering an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates an RRC establishment procedure, optionally, during which the UE LTE AS may send an indication to the network eNB, where the indication may include one of the following:

EPS fallback indication (UE to network);

-attach request；

-TAU request。

step 7, interaction between the LTE NAS and the IMS sub-layer realizes voice service, and optionally, the step 7 may include the following steps:

in step 7a, emm informs ESM MM connection setup.

In step 7b, the emm informs the IMS sub-layer that the UE is registered with the EPS.

In step 7c, emm informs ESM layer of the beer status information.

Step 7d, after the UE enters the LTE connection state and completes 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 layer:

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

-EBI。

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. 4 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. 4, the method mainly includes the following steps.

S401, the UE needs to initiate an MO call, and the IMS sub-layer 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。

s402, after the UE 5G NAS (5 GMM in the figure) receives the upper layer instruction in S401, requests the 5G AS to enter a connected state, and the UE 5G NAS (here, 5 GMM) interacts with the UE 5G AS, where the instruction sent by the 5GMM to the 5G AS may be one of the following:

-mo-VoiceCall----------4(AC)

-mo-VideoCall---------5(AC)

-mo-Data---------------9(AC)

-mo-SMS--------------6(AC)。

in step S403, the UE 5G AS decides to reselect to the LTE AS according to at least one of the system broadcast message (EPS fallback indication), NAS layer indication, UE capability UE history call information, and the like, and executes EPS fallback.

Optionally, as shown in fig. 4, the method may further include S403a: the 5G AS sends an ACK to the 5GMM, which may indicate that the UE is to make an EPS fallback.

Optionally, as shown in fig. 4, the method may further include S403b: UE 5G NAS interaction with IMS: the UE 5G NAS informs the IMS sublayer that the UE is to initiate EPS fallback, so the IMS sublayer waits for a response by the EPS NAS.

Normally, after receiving the above indication of the IMS sublayer, the UE 5G NAS should directly establish a related PDU session, and/or, an IMS signal, MMTEL voice, MMTEL video, or QoS flow of SMSoIP (QoS flow for IMS signaling, MMTEL voice, MMTEL video, SMSoIP), and feed back an establishment success message to the IMS sublayer, however, since the UE 5G AS determines to fall back to the EPS, the UE 5G NAS may notify the IMS sublayer to wait for a response of the EPS NAS (UE LTE NAS) after receiving the above acknowledgement information sent by the UE 5G AS.

S404, UE 5G AS interacts with UE LTE AS, and the indication sent by 5G AS to LTE AS may indicate one of the following:

-the UE is to perform EPS fallback;

-redirecting to LTE.

S405, the UE LTE AS notifies the UE EMM that EPS fallback is to be performed, and the UE EMM sends an attach request or TAU request to the UE LTE AS. Optionally, UE LTE AS synchronization triggers UE LTE cell selection and reselection.

S406. after the UE LTE AS triggers UE LTE cell selection and reselection and discovers an allowed or suitable cell (allowed cell or suitable cell), the UE LTE AS initiates an 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。

and S407, the LTE NAS receives an attachment acceptance message responding to the attachment request or a TAU acceptance message responding to the TAU request of the network.

S408, interaction of LTE NAS and IMS layer. Specifically, as shown in fig. 4, the following S408a, S408b, S408c, and S408d may be included.

S408a, EMM informs ESM MM connection establishment.

S408b, the EMM informs the IMS sub-layer that the UE is registered with the EPS.

S408c, the EMM informs ESM layer of bearing status (bearer status) information.

S408d, after the UE enters the LTE connected state and completes 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:

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

-EBI。

through the technical scheme provided by the embodiment of the application, when the UE triggers the calling voice service, the UE 5G AS can determine to fall back to the LTE network according to at least one of the capability information of the network side, the historical call information and the capability information of the UE, and actively trigger the network reselection to the 4G cell for acquiring the VoLTE service. 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 implementation method of the voice service provided by the embodiment of the application, the execution main body can be an implementation device of the voice service. In the embodiment of the application, the implementation method of executing the voice service by the implementation device of the voice service is taken as an example, and the implementation device of the voice service provided by the embodiment of the application is described.

Fig. 5 shows a schematic structural diagram of a device for implementing a voice service according to an embodiment of the present application, and as shown in fig. 5, the device 500 mainly includes: a determination 501 and an execution module 502.

In the embodiment of the present application, a determining module 501 is configured to trigger, by a first AS of a terminal residing in a first network, the terminal to reselect to a second network after obtaining a target indication by the first AS of the terminal, where the first AS of the terminal corresponds to the first network; and the execution module is used for executing voice service through the second network.

In one possible implementation manner, the determining module 501 obtains, through a first AS of a terminal residing in a first network, a target indication, including: and acquiring the target indication from a first NAS of the terminal through the first AS of the terminal, wherein the first NAS of the terminal corresponds to a first network.

In one possible implementation, the determining module 501 is further configured to obtain, by the first NAS of the terminal, a first indication from an upper layer of the terminal.

In one possible implementation manner, the determining module 501 is further configured to send, by the first AS of the terminal, acknowledgement information to the first NAS of the terminal, where the acknowledgement information includes: an indication of fallback to the second network.

In one possible implementation, the determining module 501 is further configured to obtain the acknowledgement information through a first NAS of the terminal, and notify an IMS sublayer of the terminal to wait for a response of a second NAS of the terminal, where the second NAS of the terminal corresponds to a second network.

In one possible implementation manner, the determining module 501 triggers, by the first AS of the terminal, the terminal to reselect to the second network, including: and triggering the terminal to reselect to a second network through the first AS of the terminal 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, as shown in fig. 5, the apparatus may further include: a receiving module 503, configured to receive broadcasted system information, where the system information carries the first indication information.

In one possible implementation, the determining module 501 triggering, by the first AS of the terminal, the terminal to reselect to the second network includes:

sending, by the first AS of the terminal, a second indication to a second AS of the terminal, wherein the second indication includes one of: an indication to fall back to the second network, an indication to redirect to the second network, the second AS of the terminal corresponding to the second network;

And notifying a second NAS trigger of the terminal to reselect to a second network through a second AS of the terminal.

In one possible implementation, the determining module 501 is further configured to:

notifying a second NAS of the terminal through a second AS of the terminal, wherein the notification message carries an indication of falling back to a second network;

sending, by the second NAS of the terminal, a third indication to a second AS of the terminal, where the third indication includes: an attach request or tracking area update TAU request;

initiating a Radio Resource Control (RRC) establishment process by a second AS of the terminal, and sending a fourth indication to the base station by the second AS of the terminal in the RRC establishment process, wherein the fourth indication comprises: an indication to fall back to the second network, the fourth indication further comprising: an attach request message or a TAU request message.

In one possible implementation, as shown in fig. 5, the apparatus may further include: a receiving module 504, configured to receive an attach accept message in response to the attach request or a TAU accept message in response to the TAU request at the network side.

In one possible implementation manner, the determining module 501 is further configured to establish a PDN connection for IMS service in the second network through a second NAS of the terminal, and send a response indication to an upper layer of the terminal, where the response indication is: an indication of success of PDN connection or EPS bearer establishment for IMS services.

In one possible implementation, the determining module 501 initiates a radio resource control RRC establishment procedure through a second AS of the terminal, including:

after receiving the attach request or TAU request, initiating a radio resource control RRC establishment procedure by a second AS of the terminal; or alternatively, the process may be performed,

and initiating a Radio Resource Control (RRC) establishment procedure through a second AS of the terminal while notifying a second NAS of the terminal to trigger reselection to a second network.

The device for implementing the voice service 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 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 device for implementing voice service 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. 4, and achieve the same technical effects, and in order to avoid repetition, the description is omitted here.

Optionally, as shown in fig. 6, the embodiment of the present application further provides a communication device 600, including a processor 601 and a memory 602, where the memory 602 stores a program or an instruction that can be executed on the processor 601, for example, when the communication device 600 is a terminal, the program or the instruction is executed by the processor 601 to implement each step of the embodiment of the implementation method of the voice service, 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 implementation method embodiment of the voice service, 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. 7 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 700 includes, but is not limited to: at least some of the components of the radio frequency unit 701, the network module 702, the audio output unit 703, the input unit 704, the sensor 705, the display unit 706, the user input unit 707, the interface unit 708, the memory 709, and the processor 710.

Those skilled in the art will appreciate that the terminal 700 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 710 via a power management system so as to perform functions such as managing charging, discharging, and power consumption via the power management system. The terminal structure shown in fig. 7 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain 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 704 may include a graphics processing unit (Graphics Processing Unit, GPU) 7041 and a microphone 7042, with the graphics processor 7041 processing 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 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes at least one of a touch panel 7071 and other input devices 7072. The touch panel 7071 is also referred to as a touch screen. The touch panel 7071 may include two parts, a touch detection device and a touch controller. Other input devices 7072 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 a network side device, the radio frequency unit 701 may transmit the downlink data to the processor 710 for processing; in addition, the radio frequency unit 701 may send uplink data to the network side device. Typically, the radio unit 701 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 709 may be used to store software programs or instructions and various data. The memory 709 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage 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 709 may include volatile memory or nonvolatile memory, or the memory 709 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 709 in embodiments of the application includes, but is not limited to, these and any other suitable types of memory.

Processor 710 may include one or more processing units; optionally, processor 710 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 710.

The processor 710 is configured to trigger, by a first AS of a terminal residing in the first network, the terminal to reselect to the second network after acquiring the target indication; and executing voice service through the second network.

The embodiment of the application also provides a readable storage medium, on which a program or an instruction is stored, which when executed by a processor, implements each process of the implementation method embodiment of the voice service, and can achieve the same technical effect, so that repetition is avoided, and no further description is provided 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 implementation method of the voice service, and the same technical effects can be achieved, so that repetition is avoided, and the description is omitted 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 embodiment of the present application further provides a computer program/program product, where 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 each process of the implementation method embodiment of the voice service, and the same technical effects can be achieved, so that repetition is avoided, and details are not repeated herein.

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. The method for realizing the voice service is characterized by comprising the following steps:

after a first access layer AS of a terminal residing in a first network acquires a target instruction, triggering the terminal to reselect to a second network, wherein the first AS of the terminal corresponds to the first network;

and the terminal executes voice service through the second network.

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

the first AS of the terminal obtains a target indication of a first non-access NAS from the terminal, wherein the first NAS of the terminal corresponds to a first network.

3. The method of claim 2, wherein the target indication is used to indicate one of:

the establishment cause is an uplink voice call and the access type AC is 4;

the reason for the establishment is an upstream video call and AC is 5;

the establishment cause is uplink data and AC is 9;

the establishment is due to an upstream short message and AC is 6.

4. The method of claim 2, wherein before the first AS of the terminal obtains the target indication from the first NAS of the terminal, the method further comprises: the first NAS of the terminal obtains a first indication from an upper layer of the terminal.

5. The method of claim 4, 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.

6. The method of claim 2, wherein after the first AS of the terminal obtains the target indication from the first non-access NAS of the terminal, the method further comprises:

the first AS of the terminal sends acknowledgement information to the first NAS of the terminal, wherein the acknowledgement information comprises: an indication of fallback to the second network.

7. The method of claim 6, wherein after the first AS of the terminal sends the acknowledgement information to the first NAS of the terminal, the method further comprises:

and the first NAS of the terminal receives the confirmation information and notifies an IMS sublayer of the terminal to wait for a response of a second NAS of the terminal, wherein the second NAS of the terminal corresponds to a second network.

8. The method of claim 1, wherein the first AS of the terminal determines to fall back to the second network, comprising:

and the first AS of the terminal determines to fall back to the second network according to the target information.

9. The method of claim 8, wherein the target information comprises at least one of:

10. The method of claim 9, wherein prior to the first AS of the terminal obtaining the target indication, the method further comprises:

the terminal receives broadcasted system information, wherein the system information carries the first indication information.

11. A method according to any of claims 1 to 10, wherein the first AS of the terminal triggers the terminal to reselect to the second network, comprising:

the first AS of the terminal sends a second indication to a second AS of the terminal, wherein the second indication comprises one of the following: an indication to fall back to the second network, an indication to redirect to the second network, the second AS of the terminal corresponding to the second network;

and the second AS of the terminal informs the second NAS of the terminal to trigger reselection to a second network.

12. The method of claim 11, wherein the second AS of the terminal informs the second NAS of the terminal to trigger reselection to a second network, comprising:

the second AS of the terminal notifies a second NAS of the terminal, wherein the notification message carries an indication of falling back to a second network;

the second NAS of the terminal sends a third indication to a second AS of the terminal, wherein the third indication comprises: an attach request or tracking area update TAU request;

the second AS of the terminal initiates a Radio Resource Control (RRC) establishment process, and in the RRC establishment process, the second AS of the terminal sends a fourth indication to the base station, wherein the fourth indication comprises: an indication to fall back to the second network, the fourth indication further comprising: an attach request message or a tracking area update TAU request message.

13. The method of claim 12, wherein after the second NAS of the terminal sends the third indication to the second AS of the terminal, the method further comprises: and the second NAS of the terminal receives an attach accept message responding to the attach request or a TAU accept message responding to the TAU request.

14. The method of claim 13, 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.

15. The method of claim 12, wherein the second AS of the terminal initiates a radio resource control, RRC, establishment procedure comprising:

after receiving the attachment request or the TAU request, the second AS of the terminal initiates a radio resource control RRC establishment procedure; or alternatively, the process may be performed,

And the second AS of the terminal initiates a Radio Resource Control (RRC) establishment process while informing the second NAS of the terminal to trigger reselection to a second network.

16. The method according to any of claims 1 to 15, wherein the first network is a 5G network and the second network is an evolved packet system EPS network.

17. The method according to any of claims 6, 7, 11 and 12, wherein the indication of fallback to the second network is an EPS fallback indication.

18. A device for implementing a voice service, applied to a terminal, the device comprising:

the determining module is used for triggering the terminal to reselect to the second network through the first AS of the terminal after the target indication is acquired through the first AS of the terminal residing in the first network, wherein the first AS of the terminal corresponds to the first network;

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

19. The apparatus of claim 18, wherein the means for determining obtains the target indication via a first AS of a terminal residing in the first network comprises: and acquiring the target indication from a first NAS of the terminal through the first AS of the terminal, wherein the first NAS of the terminal corresponds to a first network.

20. The apparatus of claim 19, wherein the means for determining is further configured to obtain, by the first NAS of the terminal, a first indication from an upper layer of the terminal.

21. The apparatus of claim 19, wherein the means for determining is further configured to send acknowledgement information to the first NAS of the terminal through the first AS of the terminal, wherein the acknowledgement information comprises: an indication of fallback to the second network.

22. The apparatus of claim 21, wherein the means for determining is further configured to obtain the acknowledgement information via a first NAS of the terminal and to notify an IMS sublayer of the terminal to wait for a response of a second NAS of the terminal, wherein the second NAS of the terminal corresponds to a second network.

23. The apparatus of claim 18, wherein the means for triggering, by the first AS of the terminal, the terminal to reselect to the second network comprises: and triggering the terminal to reselect to a second network through the first AS of the terminal according to the target information.

24. The apparatus of claim 23, wherein the target information comprises at least one of:

25. The apparatus of claim 23, wherein the apparatus further comprises: and the receiving module is used for receiving the broadcasted system information, wherein the system information carries the first indication information.

26. An apparatus according to any one of claims 18 to 25, wherein the means for triggering, by the first AS of the terminal, a reselection of the terminal to the second network comprises:

27. The apparatus of claim 26, wherein the means for determining is further configured to:

28. The apparatus of claim 27, wherein the apparatus further comprises: and the receiving module is used for receiving the attachment acceptance message of the network side responding to the attachment request or the TAU acceptance message of the TAU request.

29. The apparatus of claim 28, wherein the means for determining is further configured to establish a PDN connection for IMS traffic over a second NAS of the terminal at the second network and send a response indication to an upper layer of the terminal, wherein the response indication: an indication of success of PDN connection or EPS bearer establishment for IMS services.

30. The apparatus of claim 27, wherein the means for determining initiates a radio resource control, RRC, establishment procedure with the second AS of the terminal comprises:

31. 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 of implementing a voice service according to any one of claims 1 to 17.

32. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions, which when executed by a processor, implement the steps of the method for implementing a voice service according to any of claims 1 to 17.