WO2023174222A1

WO2023174222A1 - Voice service processing method, device, and readable storage medium

Info

Publication number: WO2023174222A1
Application number: PCT/CN2023/081167
Authority: WO
Inventors: 王洋洋; 崇卫微
Original assignee: 维沃移动通信有限公司
Priority date: 2022-03-16
Filing date: 2023-03-13
Publication date: 2023-09-21
Also published as: CN116801334A

Abstract

The present application belongs to the technical field of communications. Disclosed are a voice service processing method, a device, and a readable storage medium. The method comprises: when a first network device determines to instruct a terminal to execute fallback, the first network device sending first indication information to a first core network device, wherein the first core network device is the core network device that communicates with the terminal before same executes the fallback, and the first indication information is used for instructing the terminal to execute a voice service in an E-UTRAN cell by means of cell selection, or to execute the voice service in the E-UTRAN cell by means of cell re-selection.

Description

Voice service processing method, equipment and readable storage medium

Cross-references to related applications

This application claims priority to Chinese Patent Application No. 202210260765.3 filed in China on March 16, 2022, the entire content of which is incorporated herein by reference.

Technical field

This application belongs to the field of communication technology, and specifically relates to a voice service processing method, equipment and readable storage medium.

Background technique

After the network device receives the Quality of Service flow (QoS flow) that establishes the Internet Protocol (Internet Protocol, IP) multimedia system voice (IP Multimedia Subsystem voice, IMS voice), it triggers the evolved packet system rollback (Evolved) Packet System Fallback, EPS Fallback). In order to solve the problem of poor call experience caused by excessive EPS Fallback delay, multiple related design solutions have been proposed. Currently, there is an urgent need for a technical solution that can reduce the delay while ensuring the normal operation of the terminal and network side.

Contents of the invention

Embodiments of the present application provide a voice service processing method, equipment, and a readable storage medium, which can solve the problem of reducing delay while ensuring the normal operation of the terminal and the network side.

The first aspect provides a voice service processing method, including:

When the first network device determines to instruct the terminal to perform rollback, the first network device sends first instruction information to the first core network device;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communication, and the first indication information is used to instruct the terminal to use the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN through cell selection. The cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.

In the second aspect, a voice service processing method is provided, including:

When the terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, after the terminal cell selection or cell reselection to the E-UTRAN cell, the The terminal reports second information to the second network device, where the second information is used to establish communication between the terminal and the second core network device;

Wherein, the second core network device is the core network device for the terminal to perform post-fallback communication, and the second information includes: fifth indication information, used to indicate that the voice service of the terminal has started in the NR network Execute, or instruct the terminal to execute the voice service through fallback.

In the third aspect, a voice service processing method is provided, including:

The second network device receives second information from the terminal;

The second network device sends a first message to the second core network device according to the second information, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The fourth aspect provides a voice service processing method, including:

The first core network device receives first indication information from the first network device;

Wherein, the first core network device is a core network device for the terminal to perform pre-fallback communication, and the first instruction information is used to instruct the terminal to use the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN through cell selection. The cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.

The fifth aspect provides a voice service processing method, including:

The second core network device receives a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The second core network device sends a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device Core network equipment that performs pre-fallback communications for the terminal;

The second core network device receives the PDU session context of the terminal, and establishes a PDU session with the terminal according to the PDU session context of the terminal.

In a sixth aspect, a voice service processing device is provided, including:

A first sending module configured to send the first instruction information to the first core network device when the first network device determines to instruct the terminal to perform rollback;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communication, and the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, or through cell reselection. Perform voice services in E-UTRAN cells.

In a seventh aspect, a voice service processing device is provided, including:

A reporting module configured to perform voice services in the E-UTRAN cell through cell selection or cell reselection when the terminal performs voice services in the E-UTRAN cell through cell reselection. After the cell, report second information to the second network device, where the second information is used to establish communication between the terminal and the second core network device;

In an eighth aspect, a voice service processing device is provided, including:

A first receiving module, configured to receive second information from the terminal;

A second sending module, configured to send a first message to the second core network device according to the second information, where the first message is used to request the establishment of communication between the terminal and the second core network device;

In a ninth aspect, a voice service processing device is provided, including:

a second receiving module, configured to receive the first indication information from the first network device;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communications, and the first instruction information is used to instruct the terminal to perform cell selection in the Evolved Universal Mobile Communications System Terrestrial The radio access network E-UTRAN cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.

In a tenth aspect, a voice service processing device is provided, including:

A third receiving module, configured to receive a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The third sending module is configured to send a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device Core network equipment that performs pre-fallback communications for the terminal;

The fourth receiving module is configured for the second core network device to receive the PDU session context of the terminal, and establish a PDU session with the terminal according to the PDU session context of the terminal.

In an eleventh aspect, a network device is provided. The terminal includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor. The program or instructions are used by the processor. When executed, the steps of the method described in the first aspect or the third aspect are implemented.

In a twelfth aspect, a network device is provided, including a processor and a communication interface, wherein the communication interface is used to send the first network device to the first network device when the first network device determines to instruct the terminal to perform rollback. A core network device sends first instruction information; wherein, the first network device is a network device through which the terminal performs pre-fallback communications, and the first core network device is a core network through which the terminal performs pre-fallback communications. Equipment, the first indication information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection;

or,

The communication interface is used for the second network device to receive second information from the terminal; the second network device sends a first message to the second core network device according to the second information, and the first message is used to request establishment Communication between the terminal and the second core network device; wherein the second core network device is the core network device with which the terminal performs post-fallback communication, and the second information includes: fifth instruction information, used It is used to indicate that the voice service of the terminal has started to be executed in the NR network, or to instruct the terminal to execute the voice service through fallback.

In a thirteenth aspect, a terminal is provided, which terminal includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and the program or instructions are executed by the processor. When implementing the steps of the method described in the second aspect.

In a fourteenth aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used for the terminal to perform voice services in an E-UTRAN cell through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection. The cell executes the voice service. After the terminal cell is selected or the cell is reselected to the E-UTRAN cell, the terminal reports second information to the second network device. The second information is used to establish the connection between the terminal and the second core. Communication between network devices; wherein the second core network device is the core network device with which the terminal performs post-fallback communication, and the second information includes: fifth instruction information, used to instruct the terminal's voice The service has started to be executed in the NR network, or the terminal is instructed to execute the voice service through fallback.

In a fifteenth aspect, a core network device is provided. The core network device includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. The program or instruction is used by the processor. When executed by the processor, the steps of the method described in the fourth aspect or the fifth aspect are implemented.

In a sixteenth aspect, a core network device is provided, including a processor and a communication interface, wherein the communication interface is used for the first core network device to receive the first indication information from the first network device; wherein the first The core network equipment is the core network equipment for the terminal to perform pre-fallback communication, and the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell of the Evolved Universal Mobile Communications System Terrestrial Radio Access Network through cell selection, or Voice services are performed in the E-UTRAN cell through cell reselection.

or,

The second core network device receives a first message from the second network device, the first message is used to request the establishment of communication between the terminal and the second core network device; the second core network device according to the first message, Send a first request message to a first core network device, where the first request message is used to request the PDU session context of the terminal, and the first core network device is the core network device with which the terminal performs pre-rollback communication; The second core network device receives the PDU session context of the terminal, and establishes a PDU session with the terminal according to the PDU session context of the terminal.

In a seventeenth aspect, a computer program/program product is provided, the computer program/program product is stored in a non-volatile storage medium, and the program/program product is executed by at least one processor to implement the first The method described in the aspect, or implement the method described in the second aspect, or implement the method described in the third aspect, or implement the method described in the fourth aspect, or implement the method described in the fifth aspect.

In the embodiment of this application, when the network device determines to perform rollback, the network device instructs the core network device to perform voice services in the E-UTRAN cell through cell selection or cell reselection to ensure session continuity. delay while ensuring the normal operation of the terminal and network side.

Description of the drawings

Figure 1 is a block diagram of a wireless communication system provided by an embodiment of the present application;

Figure 2a is a flow diagram of the existing EPS Fallback mechanism;

Figure 2b is a flow diagram of the existing Inter RAT Fallback mechanism;

Figure 3 is one of the schematic flow diagrams of the voice service processing method provided by the embodiment of the present application;

Figure 4 is the second schematic flow chart of the voice service processing method provided by the embodiment of the present application;

Figure 5 is the third schematic flowchart of the voice service processing method provided by the embodiment of the present application;

Figure 6 is the fourth schematic flowchart of the voice service processing method provided by the embodiment of the present application;

Figure 7 is a schematic flow chart of the voice service processing method provided by the embodiment of the present application.

Figure 8 is a schematic diagram of the application flow provided by the embodiment of the present application;

Figure 9 is one of the structural schematic diagrams of the voice service processing device provided by the embodiment of the present application;

Figure 10 is the second structural schematic diagram of the voice service processing device provided by the embodiment of the present application;

Figure 11 is the third structural schematic diagram of the voice service processing device provided by the embodiment of the present application;

Figure 12 is the fourth structural schematic diagram of the voice service processing device provided by the embodiment of the present application;

Figure 13 is the fifth structural schematic diagram of the voice service processing device provided by the embodiment of the present application;

Figure 14 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 15 is a schematic structural diagram of a network device provided by an embodiment of the present application;

Figure 16 is a schematic structural diagram of a terminal provided by an embodiment of the present application;

Figure 17 is a schematic structural diagram of a core network device provided by an embodiment of the present application.

Detailed ways

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

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

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

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

In order to better understand the technical solutions provided by the embodiments of this application, the following content is first introduced:

EPS Fallback mechanism

An important way to realize voice in 5G Standalone (SA) network is EPS Fallback. The main idea is to switch/redirect to 4G when the call is established, use 4G VoLTE to complete the call, and return quickly after the call is over. )5G.

See Figure 2a, the specific process is as follows:

1. The UE resides in the 5G network, and the terminal-initiated (mobile original, MO) or terminal-terminated (mobile terminated, MT) voice session establishment has begun;

2. The network executes the protocol data unit (PDU) session modification process to establish the voice QoS flow;

3. When the Next Generation Radio Access Network (NG-RAN) receives the QoS flow establishing voice, if NG-RAN is configured to support EPS fallback based on IMS voice, the base station will Configuration and radio conditions determine what triggers the UE to fall back to EPS;

NG-RAN sends a PDU Session Modification Response message to PGW-C+SMF through AMF, indicating that it refuses to establish the QoS flow of voice, and indicates that the reason for the rejection is that the EPS fallback process has been started to obtain IMS voice services. SMF maintains the Policy Control and Charging (PCC) rules associated with the QoS flow.

4. NG-RAN performs handover or redirection. If the UE performs handover or passes N26 If the UE performs redirection of the interface without the N26 interface, the UE performs the registration area update process; if the UE performs redirection without the N26 interface, and the UE supports changing the request type in the multi-packet data network (Packet Data Network, PDN) connection request in the access process If the flag is "handover", and the UE receives the indication information indicating that interaction between networks without N26 is supported, the UE performs access to the PDN connection request and sets the request type to "handover".

5. After completing the move step to EPS or the handover step from 5GS to EPS, SMF/PGW re-establishes a dedicated bearer for IMS voice and maps the 5G QoS flow to the Evolved Packet Core (EPC) QoS parameters .

Inter RAT Fallback Mechanism

See Figure 2b, the specific process is as follows:

1. The UE resides in the 5G network, and the MO (mobile original) or MT (mobile terminated) voice session establishment process has begun.

2. The network executes the protocol data unit (PDU) session modification process to establish the QoS flow of voice

3. When NG-RAN receives the QoS flow establishing voice, if NG-RAN is configured to support RAT fallback based on IMS voice, the base station decides to trigger RAT fallback based on UE capabilities, network configuration and wireless conditions.

4. The source NG-RAN sends a PDU Session Modification Response message to the PDN Gateway Control Plane (PGW-C) + Session Management Function (SMF) through the AMF, indicating that it refuses to establish the QoS flow of voice, and The reason for the indication is that the fallback process has been started to obtain the IMS voice service. SMF maintains the PCC rules associated with this QoS flow.

5. NG-RAN performs handover or redirection. If PCF subscribes, SMF reports that the RAT type has changed.

6. After completing the inter-RAT switching or redirection step, SMF re-executes the PDU session modification process to establish the QoS flow of IMS voice.

In the early stages of 5G deployment, use EPS Fallback or RAT Fallback to obtain IMS language Voice calls are an important means. However, in current practical applications, it is found that the delay in obtaining voice services through EPS/RAT Fallback is long. In order to reduce the EPS/RAT Fallback delay, related technologies propose that for UEs in the idle/inactive state, if the UE can determine that the current serving cell does not support Voice service, and the UE receives a paging, and the paging indicates that the purpose of the paging is to trigger the IMS voice service, or the UE, as the calling party, wants to perform the IMS voice service, there is no need to trigger a service request in the current cell, and Directly perform cell selection/reselection to obtain voice services in the Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) cell. However, this solution requires the UE to directly perform cell selection/reselection in the E-UTRAN cell. The UTRAN cell does not interact with the core network equipment, so session discontinuity may occur. How to reduce the delay while ensuring the normal operation of the UE and the network side needs to be solved urgently.

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

Referring to Figure 3, an embodiment of the present application provides a voice service processing method, including:

Step 301: When the first network device determines to instruct the terminal to perform rollback, the first network device sends the first instruction information to the first core network device;

Wherein, the first core network device is the core network device for the terminal to perform pre-fallback communication (for example, it may be a network device in the NR network), and the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, Or perform voice services in the E-UTRAN cell through cell reselection.

In this embodiment of the present application, when the first network device determines to instruct the terminal to perform fallback to process the voice service, the first network device sends first instruction information to the first core network device to instruct the terminal to the first core network Voice services are performed in E-UTRAN cells through cell selection or cell reselection, which ensures session continuity.

It should be noted that the network equipment mentioned in the embodiments of this application refers to the network equipment in the NR network, such as the base station that the UE accesses in the NR.

In some possible implementation scenarios, the first core network device may specifically be an Access and Mobility Management Function (AMF).

In a possible implementation, the above-mentioned first network device determines to instruct the terminal to perform rollback, including:

(1) The first network device determines to send a first paging message to the terminal in idle or inactive state, and the first paging message carries second indication information;

Wherein, the second instruction information is used to instruct the terminal to execute any one of EPS fallback, RAT fallback and voice fallback;

Or (2) when the cell accessed by the terminal does not support voice services, the first network device determines to send a first paging message to the terminal, and the first paging message carries third indication information, and the third indication information Used to instruct the terminal to perform voice services.

It should be noted that determining to send the first paging message means that the above-mentioned first instruction information can be sent before sending the first paging message, or the above-mentioned first instruction information can be sent at the same time as the first paging message is sent, or the above-mentioned first instruction information can be sent. The above-mentioned first indication information is sent after sending the first paging message.

Optionally, the first network device may also send sixth indication information to the terminal in a broadcast manner, where the sixth indication information is used to indicate that the cell accessed by the terminal does not support the voice service.

In a possible implementation, the method further includes:

The first network device determines whether to instruct the terminal to perform rollback according to the first information, that is, the network device determines whether to carry the above-mentioned second instruction information in the first paging message according to the first information, that is, the first information is the first paging message. The calling message carries the preset condition of the second indication information.

It should be noted that the first network device determines whether to instruct the terminal to perform rollback according to the first information, which means that the first network device determines whether to send the above-mentioned second instruction information or the above-mentioned third instruction information to the terminal according to the first information.

Among them, the first information includes one or more of the following:

(1) Terminal capability information;

Optionally, the terminal's capability information includes one or more of the following:

(a) Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection after receiving the first paging message carrying the second indication information or the third indication information in the idle state or inactive state, or through cell reselection Perform voice services in E-UTRAN cells;

(b) Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection when it needs to perform voice services in the idle state or inactive state, or performs voice services in the E-UTRAN cell through cell reselection;

(c) Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection in the idle state or inactive state, or performing voice services in the E-UTRAN cell through cell reselection;

(2) Capability information of the first network device;

Optionally, the capability information of the first network device includes one or more of the following:

(a) Whether the first network device supports voice Fallback or EPS Fallback or RAT Fallback;

(b) Whether the first network device supports switching or redirecting idle or inactive terminals to EUTRA-5GC cells when executing voice services;

(c) Whether the first network device supports switching or redirecting idle or inactive terminals to EUTRA-EPC cells when executing voice services.

(3) The QoS flow for establishing voice (voice) received by the first network device from the first core network device;

(4) The above-mentioned third instruction information received by the first network device from the core network device;

(5) Network configuration; such as N26 interface configuration;

(6) Wireless conditions; such as cell reference signal received power (Reference Signal Received Power, RSRP), reference signal received quality (Reference Signal Received Quality, RSRP), signal-to-noise and interference ratio, SINR) quality;

(7) Network load, such as the number/proportion of UEs making IMS voice calls in the current cell.

In a possible implementation, the method further includes:

Within the preset time range, if the first network device does not receive relevant information about the terminal accessing the 4G network, the first network device resends the first paging message to the terminal;

The relevant information includes context information of the terminal, which includes PDU session context, security keys, mobility restriction lists, terminal wireless capabilities, terminal security capabilities, etc.;

The starting time of the preset time range includes any of the following:

The start of the time slot (slot), sub-frame (sub-frame), frame (frame) or discontinuous reception cycle (Discontinuous Reception cycle, DRX cycle) in which the first paging message sent by the first network device is located start time;

The starting time of the next slot, sub-frame, frame or DRX cycle of the first paging message sent by the first network device.

In the embodiment of this application, since the terminal is in the E-UTRAN cell through cell selection or cell reselection, the network device will not receive a paging feedback response from the NR network. Therefore, the network device does not receive a paging feedback response according to the preset time range. The terminal accesses the relevant information of the 4G network to retransmit the paging message. This can avoid the problem that the network device continues to send paging messages because it cannot receive the paging response after sending the paging message.

The above preset time range can be realized through a preset timer, that is, the network device turns on the first timer. If the network device does not receive relevant information about the terminal accessing the 4G network before the first timer expires, Then the network device re-sends the first paging message to the terminal.

The above preset time range can be realized through network device timing, that is, the network device turns on the timing. If the network device reaches the preset time and the network device does not receive relevant information about the terminal accessing the 4G network, the network device Resend the first paging message to the terminal.

Optionally, if it can be determined that the purpose of the first paging message of the first network device is to trigger the terminal to perform voice services in the E-UTRAN cell through cell selection or cell reselection, the aforementioned first timer or Timing.

Further, within the preset time range, the first network device does not receive relevant information about the terminal accessing the 4G network, including:

Within the preset time range, the first network device does not receive the fourth indication information sent by the first core network device, and the fourth indication information is used to indicate that the terminal successfully accesses the 4G network;

Referring to Figure 4, an embodiment of the present application provides a voice service processing method, including:

Step 401: When the terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, when the terminal cell selects or cells After reselecting to the E-UTRAN cell, the terminal reports the second information to the second network device;

The above second information is used to establish communication between the terminal and the second core network device:

Among them, the second core network device is the core network device for the terminal to perform post-fallback communication. The second information includes: fifth indication information, used to indicate that the terminal's voice service has started to be executed in the NR network (voice/data is pending) , or instruct the terminal to perform voice services through fallback.

In this embodiment of the present application, after the first network device determines to instruct the terminal to perform rollback and the terminal performs rollback, the terminal reports second information to the network device, and the second information is used to instruct the UE to perform voice services.

It should be noted that since the terminal performs fallback and has switched to the E-UTRAN cell, the network equipment mentioned in the embodiment of this application refers to the network equipment in E-UTRAN, that is, the network equipment of the 4G network, such as the UE The base station accessed in the E-UTRAN cell. The network equipment of the 4G network and the network equipment of the 5G network can be the same device, or they can be different devices.

In a possible implementation, the above-mentioned second information is used to indicate one or more of the following:

(1) The reason for establishing a Radio Resource Control (RRC) connection between the terminal and the second network device; that is, the purpose of establishing the RRC connection is to perform voice services.

(2) The reason for establishing the PDU session between the terminal and the second core network device; that is, the purpose of establishing the PDU session is to perform voice services.

(3) The second core network device requests the terminal's context information from the first core network device. The terminal's context information includes the terminal's PDU session context;

The first core network device is a core network device through which the terminal performs pre-fallback communications, such as a 5G network device.

In a possible implementation, the second information also includes one or more of the following:

(1) The identification of the first network device. The first network device is the network device through which the terminal communicates before the rollback is performed;

(2) The identification of the first core network device. The first core network device is the core network device through which the terminal communicates before performing rollback.

In a possible implementation, the terminal reports the second information to the second network device, including:

The terminal sends a registration area update request message or a re-registration request message to the second network device, and the registration area update request message or the re-registration request message carries the second information.

In the embodiment of this application, the terminal performs tracking area update (TAU)/re-registration (registration). This allows the network side to re-obtain the location information of the terminal after performing rollback, and optionally re-acquires the location information of the terminal. The registration/registration area update message indicates that the UE wants to perform voice services (voice/data is pending).

In a possible implementation, the terminal reports second information to the network device, including:

The terminal sends a PDU session establishment request or an RRC connection establishment message to the second network device, and the PDU session establishment request or RRC connection establishment message carries the second information;

Specifically, the terminal's non-access stratum (NAS) retains the protocol data unit (PDU) session information related to the voice service before falling back; the terminal executes the PDU session establishment request based on the PDU session information, and performs the PDU session establishment request in the PDU session. The establishment request message or the RRC connection establishment message carries the second information.

In the embodiment of this application, after executing TAU/registration, the terminal executes a PDU session establishment request, and instructs the UE to perform voice services (voice/data is pending) in the PDU session establishment request message.

In a possible implementation, the aforementioned terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, including:

(1) The terminal in the idle state or inactive state receives the first paging message from the first network device, and the first paging message carries the second indication information;

The terminal performs voice services in the E-UTRAN cell through cell selection according to the second instruction information, or performs voice services in the E-UTRAN cell through cell reselection;

The first paging message carries second instruction information, and the second instruction information is used to instruct the terminal to execute any one of EPS fallback, RAT fallback and voice fallback;

Or (2) when the terminal is in the idle state or inactive state, and the cell accessed by the terminal does not support voice services, the terminal selects the cell in E according to the first paging message from the first network device. -UTRAN cells perform voice services, or use cell reselection in E-UTRAN cells To perform the voice service, the first paging message carries third instruction information, and the third instruction information is used to instruct the terminal to perform the voice service.

In a possible implementation, the method further includes:

When the terminal's NAS determines that the voice service needs to be performed, the terminal determines whether to perform cell selection in the E-UTRAN cell or cell reselection in the E-UTRAN cell based on the third information;

Among them, the third information includes one or more of the following:

(1) Terminal capability information;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection after receiving the paging message carrying the first indication information in the idle state or inactive state, or performing voice services in the E-UTRAN cell through cell reselection;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection when it needs to perform voice services in the idle state or inactive state, or performs voice services in the E-UTRAN cell through cell reselection;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection in the idle state or inactive state, or performing voice services in the E-UTRAN cell through cell reselection.

(2) The sixth indication information received by the terminal from the first network device. The sixth indication information is used to indicate that the cell accessed by the terminal does not support voice services.

Optionally, the indication method includes any of the following:

(a) The indication information carried in the System Information Block (SIB) directly indicates that the current cell does not support IMS voice over NR/voice services;

(b) The SIB carries E-UTRAN frequency point information, and the frequency point information instructs the UE to perform cell selection/reselection on the frequency point when performing voice services.

Referring to Figure 5, this embodiment of the present application provides a voice service processing method, including:

Step 501: The second network device receives the second information from the terminal;

Step 502: The second network device sends a first message to the second core network device according to the second information. The first message is used to request the establishment of communication between the terminal and the second core network device;

The second information includes: fifth indication information, used to indicate that the terminal's voice service has started to be executed in the NR network, or to instruct the terminal to execute the voice service through fallback.

The first message may include at least one of the fifth indication information and the identification of the first core network device.

In a possible implementation, the second information is used to indicate one or more of the following:

Reason for establishing RRC connection;

Reason for establishing PDU session;

The second core network device requests context information of the terminal from the first core network device, where the context information of the terminal includes the PDU session context of the terminal;

Wherein, the first core network device is the core network device through which the terminal performs pre-fallback communication.

The identifier of the first network device. The first network device is the network device with which the terminal performs pre-fallback communications. The identifier of the first network device can be used by the second core network device to obtain PDU session information, and can also be used by the second core network device to obtain PDU session information. The second network device obtains downlink information related to the terminal from the first network device;

An identifier of the first core network device, which is the core network device with which the terminal performs pre-fallback communications.

In a possible implementation, the second network device receives second information from the terminal, including:

The second network device receives a registration area update request message or a re-registration request message from the terminal, and the registration area update request message or the re-registration request message carries the second information.

The second network device receives a PDU session establishment request or an RRC connection establishment message from the terminal, and the PDU session establishment request or RRC connection establishment message carries the second information.

Referring to Figure 6, an embodiment of the present application provides a voice service processing method, including:

Step 601: The first core network device receives the first indication information from the first network device;

Wherein, the first core network device is the core network device with which the terminal performs communication before fallback, and the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection. The E-UTRAN cell performs voice services. In a possible implementation, after the first core network device receives the first indication information from the first network device, the method further includes one or more of the following: 1. Stop paging the terminal;

The first core network device stops sending paging after receiving the first indication information to reduce network resource consumption;

2. Send the PDU session context information of the terminal to the second core network device;

After receiving the first instruction information, the first core network device caches the downlink data of the terminal; and retains the PDU session information of the terminal, so that after receiving the session request information sent by the 4G core network device, the first core network device can The network device sends relevant information about the PDU session established between the terminal and the 4G core network device so that the 4G core network device can map the PDU session information to the 4G PDN connection.

Referring to Figure 7, this embodiment of the present application also provides a voice service processing method, including:

Step 701: The second core network device receives a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

Step 702: The second core network device sends a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device The device is the core network device through which the terminal performs pre-fallback communications;

Step 703: The second core network device receives the PDU session context of the terminal, and establishes a PDU session with the terminal according to the PDU session context of the terminal.

In a possible implementation, the first message and the first request message include one or more of the following:

An identifier of a first network device, which is a network device with which the terminal performs pre-fallback communications;

In a possible implementation, the second core network device receives the first A message including:

The second core network device receives a registration area update request message or a re-registration request message from the second network device, and the registration area update request message or re-registration request message carries the second information.

In a possible implementation, the second core network device receives the first message from the second network device, including:

The second core network device receives a PDU session establishment request from the second network device, and the PDU session establishment request message carries the second information.

The technical solution of this application is described below with reference to specific implementation examples:

Example 1: The base station paging the UE in the inactive state

Base station side:

1. The base station receives a message from the AMF, the message is used to indicate the IMS voice service information of the first UE;

a) The IMS voice service information includes establishing the QoS flow of IMS voice;

2. The base station decides whether to carry the first indication information in paging according to the following conditions, where the first indication information is voice or EPSfallback or RATfallback or voicefallback indication information. The conditions include at least one of the following:

a) UE capability information, the capability information includes at least one of the following:

a.1) Whether the UE supports cell selection/reselection to perform voice services in the E-UTRAN cell after receiving the paging carrying the first indication information in the idle/inactive state;

a.2) Whether the UE supports cell selection/reselection to perform voice services in the E-UTRAN cell when performing voice services in the idle/inactive state;

b) Capability information of the base station, which includes at least one of the following:

b.1) Whether the base station supports EPS Fallback/RAT Fallback;

b.2) Whether the base station supports redirecting UEs in the idle/inactive state to the EUTRA-5GC cell when executing voice services;

b.3) Whether the base station supports redirecting UE in idle/inactive state when executing voice services to the EUTRA-EPC cell.

c) The base station receives the message from the AMF in 1;

d) Network configuration;

e) Wireless conditions;

f) Network load;

3. If the base station decides to carry the first indication information in paging, the base station transmits the second indication information to the AMF. The second indication information is used to instruct the UE to perform voice services in the E-UTRAN cell through cell selection/reselection.

4. The base station starts the first timer or the base station starts timing. If the base station does not receive relevant information about the UE accessing the 4G network before the timer expires or when the base station timing reaches the predefined length, the base station resends the paging to the UE. information.

a) The timer will only be opened when the purpose of sending paging is to trigger the UE to perform cell selection/reselection to obtain IMS voice services; and the timer will be closed when relevant information about the UE is received from the 4G network . The relevant information of the UE includes requesting context information of the UE.

b) The predefined duration will only be applied when the purpose of sending paging is to trigger the UE to perform cell selection/reselection to obtain IMS voice services.

UE side:

1. The UE in the RRC_INACTIVE/RRC_IDLE state receives a paging message from the network side. The paging message carries indication information, and the indication information is used to indicate at least one of the following:

a) UE performs voice services;

b) The UE obtains voice services in the EUTRA-5GC cell through cell selection/reselection;

c) The UE obtains voice services in the EUTRA-EPC cell through cell selection/reselection;

2. The UE decides whether to perform cell selection/reselection in the E-UTRAN cell based on one or more of the following information;

a) The instruction information in the above Paging message;

b) Indication information in the SIB, the indication information is used to indicate that the cell does not support voice services;

c) UE capability information;

If the UE supports obtaining voice services through EUTRA-5GC, and voice/voicefallback/RATfallback, etc. are indicated in paging, the UE performs cell selection/reselection in the EUTRA-5GC cell;

If the UE supports obtaining voice services through EUTRA-EPC, and the paging indicates voice/voicefallback/EPSfallback, etc., the UE performs cell selection/reselection in the EUTRA-EPC cell;

If voice services via EUTRA-5GC and EUTRA-EPC are supported:

If EPSfallback is indicated in paging, the UE performs cell selection/reselection in the EUTRA-EPC cell;

If RATfallback is indicated in paging, the UE performs cell selection/reselection in the EUTRA-5GC cell;

And if voice/voicefallback is indicated in paging, the UE performs cell selection/reselection in the EUTRA-EPC or EUTRA-5GC cell (implemented based on UE).

3. If the UE decides to perform cell selection/reselection to obtain voice services, the UE performs cell selection/reselection in the E-UTRAN cell;

4. The UE performs tracking area update/re-registration, optionally indicating voice/data is pending in the re-registration/registration area update message, optionally indicating that voice/data is pending in the re-registration/registration area update message. Indicates source gNB/source CN node information.

5. The UE executes the service request, optionally indicating that voice/data is pending in the service request message/RRC connection establishment message, and optionally indicating the source gNB/source CN node information in the service request message/RRC connection establishment message.

Example 2: UE initiates voice service

1. A UE in the RRC_IDLE/RRC_INACTIVE state is camped in an NR cell. The UE receives indication information from the network side. The indication information is used to indicate that the current cell does not support voice services. The indication method includes any of the following:

a) The SIB carries indication information that directly indicates that the current cell does not support IMS voice over NR/voice services;

b) The SIB carries E-UTRAN frequency point information, and the frequency point information instructs the UE to perform cell selection/reselection on the frequency point when performing voice services;

2. The NAS layer of the UE determines that the UE wants to perform IMS voice services, and decides whether to perform E-UTRAN cell selection and reselection based on at least one of the following conditions. Said conditions include:

b) Instruction information of the SIB described in 1;

3. If the UE decides to execute the service request to obtain the IMS voice service, the UE executes the service request. The following procedures (specifically 4 and 5) do not apply to this situation;

If the UE decides to perform cell selection/reselection to obtain voice services, the UE performs cell selection/reselection in the E-UTRAN cell, and then continues to perform the following process;

4. The NAS layer of the UE retains PDU session information related to the current IMS voice service. The session information includes at least one of the following information:

a) List of PDU sessions you wish to activate

b)QoS flow related information of IMS voice

5. The UE performs tracking area update/re-registration, optionally indicating voice/data is pending in the re-registration/registration area update message, optionally in the re-registration/registration area update message. Indicates source gNB/source CN node information.

6. The UE performs a service request based on the PDU session information related to the IMS voice service reserved in 3, optionally indicating that voice/data is pending in the service request message/RRC connection establishment message, optionally indicating in the service request message/RRC connection establishment message The source gNB/source CN node information is indicated in the establishment message.

Example three, see Figure 8:

Step 0: During/after the UE initiates the registration process with the 5G network, the UE reports the UE's capability information to the 5GC network.

Among them, the capability information reported by the UE here includes at least one of the following:

(1) The ability of idle state UE to support cell selection/reselection to the 4G network and initiate (calling and/or called) VoLTE voice services;

(2) After the idle state UE obtains the paging signaling carrying the EPS FB voice service indication information, it supports cell selection/reselection to the 4G network and the ability to initiate the called VoLTE voice service.

The registration process may be an initial registration process (initial registration) or a mobility registration process (mobility registration) or a periodic registration process (periodic registration). Of course, the UE can report the above UE capability information through NAS signaling (such as service request message) at other times after registering to the 5GC network.

Step 1: The user plane gateway (PGW-U/UPF) obtains the called service request message (Session Initiation Protocol invite, SIP invite) from the IMS network for the UE. If the user plane tunnel (such as N3 tunnel) of the UE does not exist, Then PGW-U/UPF sends a downlink data notification message (downlink data notification) to the control plane gateway (PGW-C/SMF).

Among them, the PGW-U/UPF carries the voice service indication information in the downlink data notification message, which is used to inform the PGW-C/SMF that the DDN is initiated because of the voice service. Specifically, PGW-U/UPF can identify the data packet as a voice service data packet based on the DSCP/TOS/TO and other fields in the downlink data packet header, and then carry the voice service indication information in the downlink data notification message.

Step 2: PGW-C/SMF transmits downlink data to the base station, indicating that the downlink data contains the QoS flow for establishing voice.

Step 3-4: According to the message in Step 2, gNB determines that the inactive UE needs to initiate the called voice service, and then triggers the paging process for the inactive UE.

Specifically, the NG RAN initiates a paging message to the UE, and the paging message carries voice service fallback indication information (EPS fallback indication). This information is used to indicate that the UE needs to fall back to the 4G network to initiate voice services, or to indicate that the UE can use Fall back to the 4G network mechanism and initiate voice services.

Step 5: Optionally, the AMF sends a first message to the PGW-C/SMF, where the first message may carry first indication information to indicate that the UE is/is about to perform voice service fallback to 4G. network process. Specifically, the first indication information may be in the form of fallback indication information (EPS fallback indication), reselection indication information, or handover indication information. Correspondingly, after the PGW-C/SMF receives the first indication information, the PGW-C/SMF can stop the current paging wait for the UE or avoid paging again or stop transmitting downlink data to the UE, and wait for the UE to receive the UE from the 4G network. enter.

Optionally, the signaling transmission response message may carry waiting time information to indicate the estimated time required for the UE to fall back to the 4G network. This waiting time information is used for PGW-C/SMF to evaluate the time it takes to wait for the UE to access from 4G. In other words, it is used for PGW-C/SMF to evaluate the maximum buffering time of the UE's downlink data. Accordingly, after receiving the waiting time information, the PGW-C/SMF itself or controls the PGW-U/UPF to cache the downlink data for a period of time. After the time period exceeds, the PGW-C/SMF itself or controls the PGW-U/UPF to discard the UE's downlink data.

Specifically, the signaling transmission response message is Namf_Communication_N1N2MessageTransfer response or Namf_Communication_N1N2Transfer Failure Notification

Step 7: The UE determines that it needs to initiate the called voice service according to the paging signaling. The UE decides and executes the reselection process to 4G so that the VoLTE service can be executed on the 4G network.

Based on the voice service fallback indication (EPS fallback indication) in the paging message, the UE decides to trigger reselection to the 4G network and initiate the voice service. Specifically, the UE performs a cell reselection process and accesses the 4G cell.

Step 8-9: The UE sends a TAU request message to the MME to trigger the registration process in the 4G network.

Step 10: The MME sends a context acquisition request message to the AMF according to the TAU request message to obtain the context of the UE.

Step 11: Based on the context acquisition request message, the AMF determines that the UE has accessed the 4G network by triggering the voice service fallback process. The AMF sends indication information to the gNB to indicate that the UE has successfully fallen back.

In addition, the gNB stops the original paging mechanism for the UE according to the indication information, including clearing the paging timer of the UE or stopping paging the UE again.

Step 12: AMF sends a session context request message to SMF/PGW-C to obtain the UE's session context in the network.

Optionally, the AMF carries the first indication information in the session context request message, which is used to indicate that the UE is/is about to perform a voice service fallback to the 4G network process. Specifically, the first indication information may be in the form of fallback indication information (EPS fallback indication), reselection indication information, or handover indication information. Accordingly, after the PGW-C/SMF receives the first indication information, the PGW-C/SMF can stop the current paging wait for the UE or avoid paging again, and wait for the UE to access from the 4G network.

Step 13: The SMF sends the UE's session context information in the network to the AMF.

Steps 14-26, the TAU process continues until the end.

During the process, after SMF/PGW-C obtains the tunnel identifier and port number corresponding to the voice service signaling tunnel, it can instruct UPF/PGW-U to send the buffered voice signaling data packet downstream. Among them, the voice service signaling tunnel is an N3 tunnel with 5QI=5 in the 5G network, and corresponds to the EPS bearer with QCI=5 in the 4G network. In addition, SMF/PGW-C recognizes that it has obtained the tunnel ID and port number corresponding to the voice service signaling tunnel based on the RAN tunnel ID and port number corresponding to the EPS bearer with QCI=5 contained in the received modify bearer request message sent by the SGW. The port number.

Correspondingly, the buffered downlink voice signaling data packet (SIP invite message) is sent to ENB via UPF/PGW-U and then transmitted to the UE.

Step 27: After the UE receives the cached downlink voice signaling data packet (SIP invite message) in the 4G network, it triggers other steps of the called voice service until the voice service is continued and ended.

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

Referring to Figure 9, an embodiment of the present application provides a voice service processing device 900, which includes:

The first sending module 901 is configured to send the first instruction information to the first core network device when the first network device determines to instruct the terminal to perform rollback;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communication, and the first instruction information is used to instruct the terminal to perform cell selection in the Evolved Universal Mobile Communications System Terrestrial The radio access network E-UTRAN cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.

Optionally, the first network device determines to instruct the terminal to perform rollback, including:

The first network device determines to send a first paging message to the terminal in an idle state or an inactive state, and the first paging message carries second indication information;

Wherein, the second instruction information is used to instruct the terminal to perform any one of the evolved packet system fallback EPS fallback, the radio access technology fallback RAT fallback and the voice fallback voice fallback; or

When the cell accessed by the terminal does not support voice services, the first network device determines to send a first paging message to the terminal, and the first paging message carries third indication information, and the The third instruction information is used to instruct the terminal to perform the voice service.

Optionally, the device also includes:

A first determination module, configured for the first network device to determine whether to instruct the terminal to perform rollback based on the first information;

Wherein, the first information includes one or more of the following:

Capability information of the terminal;

Capability information of the first network device;

The QoS flow for establishing voice voice received by the first network device from the first core network device;

the third indication information received by the first network device from the first core network device;

Network Configuration;

wireless conditions;

Network load.

Whether the terminal supports performing voice in the E-UTRAN cell through cell selection after receiving the first paging message carrying the second indication information or the third indication information in the idle state or the inactive state. services, or perform voice services in the E-UTRAN cell through cell reselection;

Whether the first network device supports voice Fallback or EPS Fallback or RAT Fallback;

Whether the first network device supports switching or redirecting idle or inactive terminals to EUTRA-5GC cells when executing voice services;

Whether the first network device supports switching or redirecting a terminal in an idle state or an inactive state to an EUTRA-EPC cell when executing a voice service.

Optionally, the device also includes:

The third sending module is configured to re-send the first network device to the terminal if the first network device does not receive relevant information about the terminal accessing the 4G network within the preset time range. The first paging message;

Wherein, the relevant information includes context information of the terminal;

The starting time of the preset time range includes any of the following:

The starting time of the time slot, sub-frame, frame or discontinuous reception cycle DRX cycle in which the first paging message sent by the first network device is located;

Optionally, within a preset time range, the first network device does not receive relevant information about the terminal accessing the 4G network, including:

Within the preset time range, the first network device does not receive the fourth indication information sent by the first core network device. The fourth indication information is used to indicate that the terminal successfully accesses the 4G network.

Referring to Figure 10, an embodiment of the present application provides a voice service processing device 1000, which includes:

Reporting module 1001, configured to perform voice services in the E-UTRAN cell through cell selection or cell reselection when the terminal performs voice services in the E-UTRAN cell through cell reselection. After entering the UTRAN cell, the terminal reports second information to the second network device, where the second information is used to establish communication between the terminal and the second core network device;

Optionally, the second information is used to indicate one or more of the following:

Establish an RRC connection between the terminal and the second core network device;

Establish a PDU session between the terminal and the second core network device;

The second core network device requests the PDU session context of the terminal from the first core network device;

Optionally, the second information also includes one or more of the following:

Optionally, the reporting module is used to:

The terminal sends a registration area update request message or a re-registration request message to the second network device, and the registration area update request message or re-registration request message carries the second information.

Optionally, the reporting module is used to:

The terminal PDU session information sends a PDU session establishment request or an RRC connection establishment message to the second network device, and the PDU session establishment request or RRC connection establishment message carries the second information.

Optionally, the terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, including:

The terminal in an idle state or an inactive state receives a first paging message from a first network device, where the first paging message carries second indication information;

The terminal performs voice services in the E-UTRAN cell through cell selection according to the second indication information, or performs voice services in the E-UTRAN cell through cell reselection;

Wherein, the first paging message carries second instruction information, and the second instruction information is used to instruct the terminal to execute any one of EPS fallback, RAT fallback and voice fallback;

or,

When the terminal is in an idle state or an inactive state and the cell accessed by the terminal does not support voice services, the terminal selects a cell according to the first paging message from the first network device. To perform voice services in the E-UTRAN cell, or to perform voice services in the E-UTRAN cell through cell reselection, the first paging message carries third indication information, and the third indication information is used to indicate The terminal performs voice services.

Optionally, the device also includes:

The second determination module is configured to determine whether to perform cell selection in the E-UTRAN cell or cell reselection in the E-UTRAN cell according to the third information when the NAS of the terminal determines that the voice service needs to be performed. E-UTRAN cell;

Wherein, the third information includes one or more of the following:

Capability information of the terminal;

The sixth indication information received by the terminal from the first network device is used to indicate that the cell accessed by the terminal does not support voice services.

Referring to Figure 11, an embodiment of the present application provides a voice service processing device 1000, which includes:

The first receiving module 1101 is used for the second network device to receive the second information from the terminal;

The second sending module 1102 is used for the second network device to send a first message to the second core network device according to the second information, where the first message is used to request the establishment of the terminal and the second core network device. communication between;

Optionally, the second information also includes one or more of the following:

Optionally, the first receiving module is used for:

Referring to Figure 12, this embodiment of the present application provides a voice service processing device 1200, which includes:

The second receiving module 1201 is used to receive the first indication information from the first network device;

Wherein, the first core network device is a core network device for the terminal to perform pre-fallback communication, and the first instruction information is used to instruct the terminal to use the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN through cell selection. The cell performs voice services, or performs cell reselection in the E-UTRAN cells perform voice services.

Optionally, the apparatus further includes a processing module configured to perform one or more of the following after the first core network device receives the first indication information from the first network device:

Stop paging the terminal;

Send the PDU session context information of the terminal to the second core network device.

Referring to Figure 13, this embodiment of the present application provides a voice service processing device 1300, which includes:

The third receiving module 1301 is configured to receive a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The third sending module 1302 is configured to send a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device The device is the core network device through which the terminal performs pre-fallback communications;

The fourth receiving module 1303 is configured for the second core network device to receive the PDU session context of the terminal, and establish a PDU session with the terminal according to the PDU session context of the terminal.

Optionally, the first message and the first request message include one or more of the following:

Optionally, the third receiving module is used for:

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

The voice service processing device provided by the embodiment of the present application can implement each process implemented by the method embodiments of Figures 3 to 8, and achieve the same technical effect. To avoid duplication, the details will not be described here.

Optionally, as shown in Figure 14, this embodiment of the present application also provides a communication device 1400, which includes a processor 1401 and a memory 1402. The memory 1402 stores programs or instructions that can be run on the processor 1401, such as , when the communication device 1400 is a terminal, when the program or instruction is executed by the processor 1401, each step of the above voice service processing method embodiment is implemented, and the same technical effect can be achieved. When the communication device 1400 is a network device, when the program or instruction is executed by the processor 1401, each step of the above voice service processing method embodiment is implemented, and the same technical effect can be achieved. To avoid duplication, the details are not repeated here.

Embodiments of the present application also provide a network device, including a processor and a communication interface. The communication interface is used to send the first network device to the first core network when the first network device determines to instruct the terminal to perform rollback. The device sends the first instruction information; wherein, the first network device is a network device through which the terminal performs communication before fallback, and the first core network device is a core network device through which the terminal performs communication before fallback, so The first indication information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection;

or,

This network device embodiment is different from the above method embodiments of the first network device and the second network device. Accordingly, each implementation process and implementation manner of the above method embodiment can be applied to this network device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network device. As shown in FIG. 15 , the network device 1500 includes: an antenna 151 , a radio frequency device 152 , a baseband device 153 , a processor 154 and a memory 155 . The antenna 151 is connected to the radio frequency device 152 . In the uplink direction, the radio frequency device 132 receives information through the antenna 151 and sends the received information to the baseband device 153 for processing. In the downlink direction, the baseband device 153 processes the information to be sent and sends it to the radio frequency device 152. The radio frequency device 152 processes the received information and then sends it out through the antenna 151.

The method performed by the network device in the above embodiment can be implemented in the baseband device 153, which includes a baseband processor.

The baseband device 153 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.

The network device may also include a network interface 156, such as a common public radio interface (CPRI).

Specifically, the network device 1500 in this embodiment of the present invention also includes: instructions or programs stored in the memory 155 and executable on the processor 154. The processor 154 calls the instructions or programs in the memory 155 to execute the instructions shown in Figures 9 and 11 To avoid duplication, the methods for executing each module and achieving the same technical effect will not be described in detail here.

Embodiments of the present application also provide a terminal, including a processor and a communication interface. The communication interface is used for the terminal to perform voice services in an E-UTRAN cell through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection. After executing the voice service, the terminal reports second information to the second network device, and the second information is used to establish communication between the terminal and the second core network device; wherein the second core network device is The terminal performs the core network equipment for communication after fallback, and the second information includes: fifth indication information, used to indicate that the voice service of the terminal has started to be executed in the NR network, or to instruct the terminal to pass the fallback. Perform voice services. The terminal embodiment Corresponding to the above terminal-side method embodiment, each implementation process and implementation manner of the above method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 16 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 1600 includes but is not limited to: a radio frequency unit 1601, a network module 1602, an audio output unit 1603, an input unit 1604, a sensor 1605, a display unit 1606, a user input unit 1607, an interface unit 1608, a memory 1609, a processor 1610, etc. At least some parts.

Those skilled in the art can understand that the terminal 1600 may also include a power supply (such as a battery) that supplies power to various components. The power supply may be logically connected to the processor 1610 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 16 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.

It should be understood that in the embodiment of the present application, the input unit 1604 may include a graphics processing unit (Graphics Processing Unit, GPU) 16041 and a microphone 16042. The graphics processor 16041 is responsible for the image capture device (GPU) in the video capture mode or the image capture mode. Process the image data of still pictures or videos obtained by cameras (such as cameras). The display unit 1606 may include a display panel 16061, which may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1607 includes a touch panel 16071 and at least one of other input devices 16072. Touch panel 16071, also known as touch screen. The touch panel 16071 may include two parts: a touch detection device and a touch controller. Other input devices 16072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.

In this embodiment of the present application, after receiving downlink data from the network device, the radio frequency unit 1601 can transmit it to the processor 1410 for processing; in addition, the radio frequency unit 1601 can send uplink data to the network device. Generally, the radio frequency unit 1601 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.

Memory 1609 may be used to store software programs or instructions as well as various data. The memory 1609 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the A storage area can store an operating system, an application program or instructions required for at least one function (such as a sound playback function, an image playback function, etc.), etc. Additionally, memory 1609 may include volatile memory or nonvolatile memory, or memory 1609 may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory. Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (Synch link DRAM) , SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DRRAM). Memory 1609 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 1610 may include one or more processing units; optionally, the processor 1610 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 1610.

Among them, the radio frequency unit 1601 is used for the terminal to perform voice services in the E-UTRAN cell through cell selection, or after performing voice services in the E-UTRAN cell through cell reselection, the terminal reports the second information to the second network device , the second information is used to establish communication between the terminal and the second core network device;

The second core network device requests context information of the terminal from the first core network device according to the second information, where the context information of the terminal includes the PDU session context of the terminal;

Optionally, the second information also includes one or more of the following:

Optionally, the radio frequency unit 1601 is used for:

The terminal sends a PDU session establishment request or an RRC connection establishment message to the second network device according to the protocol data unit PDU session information before the rollback, and the PDU session establishment request or RRC connection establishment message carries the second information.

or,

Optionally, the processor 1610 is configured to, when the NAS of the terminal determines that the voice service needs to be performed, the terminal determines whether to perform cell selection in the E-UTRAN cell or the cell based on the third information. Reselect the E-UTRAN cell;

Wherein, the third information includes one or more of the following:

Capability information of the terminal;

Specifically, the embodiment of the present application also provides a core network device. As shown in Figure 17, the core network device 1700 includes: a processor 1701, a network interface 1702, and a memory 1703. Among them, the network interface 1702 is, for example, a common public radio interface (CPRI).

Specifically, the core network device 1700 in this embodiment of the present invention also includes: instructions or programs stored in the memory 1703 and executable on the processor 1701. The processor 1701 calls the instructions or programs in the memory 1703 to execute the instructions shown in Figures 12 and 13. Show the execution method of each module and achieve the same technical effect. To avoid repetition, we will not go into details here.

Embodiments of the present application also provide a readable storage medium. Programs or instructions are stored on the readable storage medium. When the program or instructions are executed by a processor, each process of the above voice service processing method embodiment is implemented, and can achieve The same technical effects are not repeated here to avoid repetition.

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

An embodiment of the present application further provides a chip. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the above embodiments of the voice service processing method. Each process can achieve the same technical effect. To avoid repetition, we will not go into details here.

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

Embodiments of the present application further provide a computer program/program product. The computer program/program product is stored in a storage medium. The computer program/program product is executed by at least one processor to implement the above voice service processing method. Each process in the example can achieve the same technical effect. To avoid repetition, we will not repeat it here.

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

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

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

Claims

A voice service processing method, including:

When the first network device determines to instruct the terminal to perform rollback, the first network device sends first instruction information to the first core network device;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communication, and the first indication information is used to instruct the terminal to use the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN through cell selection. The cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.
The method according to claim 1, wherein the first network device determines to instruct the terminal to perform rollback, including:

The first network device determines to send a first paging message to the terminal in an idle state or an inactive state, and the first paging message carries second indication information;

Wherein, the second instruction information is used to instruct the terminal to perform any one of the evolved packet system fallback EPS fallback, the radio access technology fallback RAT fallback and the voice fallback voice fallback; or

When the cell accessed by the terminal does not support voice services, the first network device determines to send a first paging message to the terminal, and the first paging message carries third indication information, and the The third instruction information is used to instruct the terminal to perform the voice service.
The method of claim 1, further comprising:

The first network device determines whether to instruct the terminal to perform rollback based on the first information;

Wherein, the first information includes one or more of the following:

Capability information of the terminal;

Capability information of the first network device;

The QoS flow for establishing voice voice received by the first network device from the first core network device;

The third instruction information received by the first network device from the first core network device, the third instruction information is used to instruct the terminal to perform the voice service;

Network Configuration;

wireless conditions;

Network load.
The method according to claim 3, wherein the capability information of the terminal includes one or more of the following:

Whether the terminal supports selecting the E-UTRAN cell through cell selection after receiving the first paging message carrying the second indication information or the third indication information in the idle state or the inactive state. Perform voice services, or perform voice services in the E-UTRAN cell through cell reselection, and the second instruction information is used to instruct the terminal to perform any one of EPS fallback, RAT fallback and voice fallback;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection when it needs to perform voice services in the idle state or inactive state, or performs voice services in the E-UTRAN cell through cell reselection;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection in the idle state or inactive state, or performing voice services in the E-UTRAN cell through cell reselection.
The method of claim 3, wherein,

The capability information of the first network device includes one or more of the following:

Whether the first network device supports voice Fallback or EPS Fallback or RAT Fallback;

Whether the first network device supports switching or redirecting idle or inactive terminals to EUTRA-5GC cells when executing voice services;

Whether the first network device supports switching or redirecting a terminal in an idle state or an inactive state to an EUTRA-EPC cell when executing a voice service.
The method of claim 2, further comprising:

Within the preset time range, if the first network device does not receive relevant information about the terminal accessing the 4G network, the first network device resends the first paging message to the terminal;

Wherein, the relevant information includes context information of the terminal;

The starting time of the preset time range includes any of the following:

The starting time of the time slot, sub-frame, frame or discontinuous reception cycle DRX cycle in which the first paging message sent by the first network device is located;

The starting time of the next slot, sub-frame, frame or DRX cycle of the first paging message sent by the first network device.
The method according to claim 6, wherein within a preset time range, the first network device does not receive relevant information about the terminal accessing the 4G network, including:

Within the preset time range, the first network device does not receive the fourth indication information sent by the first core network device. The fourth indication information is used to indicate that the terminal successfully accesses the 4G network.
A voice service processing method, including:

When the terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, the terminal cell selection or cell After being reselected to the E-UTRAN cell, the terminal reports second information to the second network device, where the second information is used to establish communication between the terminal and the second core network device;

Wherein, the second core network device is the core network device for the terminal to perform post-fallback communication, and the second information includes: fifth indication information, used to indicate that the voice service of the terminal has started in the NR network Execute, or instruct the terminal to execute the voice service through fallback.
The method of claim 8, wherein the second information is used to indicate one or more of the following:

The reason for establishing the RRC connection between the terminal and the second network device;

The reason for establishing the PDU session between the terminal and the second core network device;

The second core network device requests the PDU session context of the terminal from the first core network device;

Wherein, the first core network device is the core network device through which the terminal performs pre-fallback communication.
The method according to claim 8, wherein the second information further includes one or more of the following:

An identifier of a first network device, which is a network device with which the terminal performs pre-fallback communications;

An identifier of the first core network device, which is the core network device with which the terminal performs pre-fallback communications.
The method according to claim 8, wherein the terminal reports the second information to the second network device, including:

The terminal sends a registration area update request message or a re-registration request message to the second network device, and the registration area update request message or re-registration request message carries the second information.
The method according to claim 8, wherein the terminal reports the second information to the second network device, including:

The terminal sends a PDU session establishment request or an RRC connection establishment message to the second network device, and the PDU session establishment request or RRC connection establishment message carries the second information.
The method according to claim 8, wherein the terminal performs voice services in the E-UTRAN cell through cell selection, or performs voice services in the E-UTRAN cell through cell reselection, including:

The terminal in an idle state or an inactive state receives a first paging message from a first network device, where the first paging message carries second indication information;

The terminal performs voice services in the E-UTRAN cell through cell selection according to the second indication information, or performs voice services in the E-UTRAN cell through cell reselection;

Wherein, the first paging message carries second indication information, and the second indication information is Instructing the terminal to execute any one of EPS fallback, RAT fallback and voice fallback;

or,

When the terminal is in an idle state or an inactive state and the cell accessed by the terminal does not support voice services, the terminal selects a cell according to the first paging message from the first network device. To perform voice services in the E-UTRAN cell, or to perform voice services in the E-UTRAN cell through cell reselection, the first paging message carries third indication information, and the third indication information is used to indicate The terminal performs voice services.
The method of claim 13, wherein the method further includes:

When the NAS of the terminal determines that the voice service needs to be performed, the terminal determines whether to perform cell selection in the E-UTRAN cell or cell reselection in the E-UTRAN cell based on the third information;

Wherein, the third information includes one or more of the following:

Capability information of the terminal;

The sixth indication information received by the terminal from the first network device is used to indicate that the cell accessed by the terminal does not support voice services.
The method according to claim 13, wherein the capability information of the terminal includes one or more of the following:

Whether the terminal supports performing voice in the E-UTRAN cell through cell selection after receiving the first paging message carrying the second indication information or the third indication information in the idle state or the inactive state. services, or perform voice services in the E-UTRAN cell through cell reselection;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection when it needs to perform voice services in the idle state or inactive state, or performs voice services in the E-UTRAN cell through cell reselection;

Whether the terminal supports performing voice services in the E-UTRAN cell through cell selection in the idle state or inactive state, or performing voice services in the E-UTRAN cell through cell reselection.
A voice service processing method, including:

The second network device receives second information from the terminal;

The second network device sends a first message to the second core network device according to the second information, where the first message is used to request the establishment of communication between the terminal and the second core network device;

Wherein, the second information includes: fifth indication information, used to indicate that the terminal's voice service has started to be executed in the NR network, or to instruct the terminal to execute the voice service through fallback.
The method according to claim 16, wherein the second information further includes one or more of the following:

An identifier of a first network device, which is a network device with which the terminal performs pre-fallback communications;

An identifier of the first core network device, which is the core network device with which the terminal performs pre-fallback communications.
The method of claim 16, wherein the second network device receives second information from the terminal, including:

The second network device receives a registration area update request message or a re-registration request message from the terminal, and the registration area update request message or the re-registration request message carries the second information.
The method of claim 16, wherein the second network device receives second information from the terminal, including:

The second network device receives a PDU session establishment request or an RRC connection establishment message from the terminal, and the PDU session establishment request or RRC connection establishment message carries the second information.
A voice service processing method, including:

The first core network device receives first indication information from the first network device;

Wherein, the first core network device is a core network device for the terminal to perform pre-fallback communication, and the first instruction information is used to instruct the terminal to use the Evolved Universal Mobile Communications System Terrestrial Radio Access Network E-UTRAN through cell selection. The cell performs voice services, or performs voice services in the E-UTRAN cell through cell reselection.
The method according to claim 20, wherein after the first core network device receives the first indication information from the first network device, the method further includes one or more of the following:

Stop paging the terminal;

Send the PDU session context information of the terminal to a second core network device, where the second core network device is the core network device with which the terminal performs pre-fallback communication.
A voice service processing method, including:

The second core network device receives a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The second core network device sends a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device Core network equipment that performs pre-fallback communications for the terminal;

The second core network device receives the PDU session context of the terminal, and establishes a PDU session with the terminal according to the PDU session context of the terminal.
The method of claim 22, wherein the first message and the first request message include one or more of the following:

An identifier of a first network device, which is a network device with which the terminal performs pre-fallback communications;

An identifier of the first core network device, which is the core network device with which the terminal performs pre-fallback communications.
The method of claim 22, wherein the second core network device receives the first message from the second network device, comprising:

The second core network device receives a registration area update request message or a re-registration request message from the second network device, and the registration area update request message or the re-registration request message carries the second information;

Wherein, the second information includes: fifth indication information, used to indicate that the terminal's voice service has started to be executed in the NR network, or to instruct the terminal to execute the voice service through fallback.
The method of claim 22, wherein the second core network device receives the first message from the second network device, comprising:

The second core network device receives a PDU session establishment request from the second network device, and the PDU session establishment request message carries second information;

Wherein, the second information includes: fifth indication information, used to indicate that the terminal's voice service has started to be executed in the NR network, or to instruct the terminal to execute the voice service through fallback.
A voice service processing device, including:

A first sending module configured to send the first instruction information to the first core network device when the first network device determines to instruct the terminal to perform rollback;

Wherein, the first core network device is the core network device with which the terminal performs pre-fallback communication, and the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell through cell selection, or through cell reselection. Perform voice services in E-UTRAN cells.
A voice service processing device, including:

A reporting module configured to perform voice services in the E-UTRAN cell through cell selection or cell reselection when the terminal performs voice services in the E-UTRAN cell through cell reselection. After the cell, report second information to the second network device, where the second information is used to establish communication between the terminal and the second core network device;

Wherein, the second core network device is the core network device for the terminal to perform post-fallback communication, and the second information includes: fifth indication information, used to indicate that the voice service of the terminal has started in the NR network Execute, or instruct the terminal to execute the voice service through fallback.
A voice service processing device, including:

A first receiving module, configured to receive second information from the terminal;

A second sending module, configured to send a first message to the second core network device according to the second information, where the first message is used to request the establishment of communication between the terminal and the second core network device;

Wherein, the second core network device is the core network device for the terminal to perform post-fallback communication, and the second information includes: fifth indication information, used to indicate that the voice service of the terminal has started in the NR network Execute, or instruct the terminal to execute the voice service through fallback.
A voice service processing device, including:

a second receiving module, configured to receive the first indication information from the first network device;

Wherein, the first instruction information is used to instruct the terminal to perform voice services in the E-UTRAN cell of the Evolved Universal Mobile Communications System Terrestrial Radio Access Network through cell selection, or to perform voice services in the E-UTRAN cell through cell reselection.
A voice service processing device, including:

A third receiving module, configured to receive a first message from the second network device, where the first message is used to request the establishment of communication between the terminal and the second core network device;

The third sending module is configured to send a first request message to the first core network device according to the first message. The first request message is used to request the PDU session context of the terminal. The first core network device Core network equipment that performs pre-fallback communications for the terminal;

The fourth receiving module is configured for the second core network device to receive the PDU session context of the terminal, and establish a PDU session with the terminal according to the PDU session context of the terminal.
A network device, including a processor, a memory and a program or instructions stored on the memory and executable on the processor. When the program or instructions are executed by the processor, the implementation of claims 1 to 7 is achieved. The steps of the voice service processing method described in any one of claims 16 to 20.
A terminal, including a processor, a memory and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, any of claims 8 to 15 can be implemented. The steps of the voice service processing method described in one item.
A core network device, including a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the implementation of claims 21 to 21 The steps of the voice service processing method according to any one of claims 22 to 26, or the steps of the voice service processing method according to any one of claims 23 to 26.
A readable storage medium on which programs or instructions are stored. When the programs or instructions are executed by a processor, the steps of the method as described in any one of claims 1 to 7 are implemented, or as claimed in claim 1 The steps of the method according to any one of 8 to 15, or the steps of the method according to any one of claims 16 to 20, or the steps of the method according to any one of claims 21 to 22, or the steps of the method according to any one of claims 23 to 22. The steps described in any one of 26.