WO2021233264A1 - 一种通信方法、设备及系统 - Google Patents

一种通信方法、设备及系统 Download PDF

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Publication number
WO2021233264A1
WO2021233264A1 PCT/CN2021/094194 CN2021094194W WO2021233264A1 WO 2021233264 A1 WO2021233264 A1 WO 2021233264A1 CN 2021094194 W CN2021094194 W CN 2021094194W WO 2021233264 A1 WO2021233264 A1 WO 2021233264A1
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WIPO (PCT)
Prior art keywords
terminal
request message
access network
service
service request
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PCT/CN2021/094194
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English (en)
French (fr)
Inventor
魏海涛
丁辉
叶进洲
陆长奇
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华为技术有限公司
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Publication of WO2021233264A1 publication Critical patent/WO2021233264A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a communication method, device and system.
  • the 5G (fifth generation mobile communication technology) network adopts a new radio bearer voice (voice over new radio, VoNR,) to implement user equipment (UE) voice services.
  • VoNR voice over new radio
  • UE user equipment
  • the way of VoNR refers to the 5G access network and the core network to provide voice services based on the IP multiple subsystem (IMS).
  • IMS IP multiple subsystem
  • This application provides a communication method, equipment, and system to implement UE voice services.
  • this application provides a communication method that can be applied to AMF equipment in a communication system.
  • a 5G network can interoperate with a 4G network.
  • the access and mobility management function (AMF) device receives the first service request (SR) message from the access network device, and the first SR message Used to request terminal services on the 5G network.
  • the AMF device determines that the first SR message is triggered by the voice service of the terminal.
  • the voice service may be the calling voice service or the called voice service.
  • the AMF device sends a fallback instruction to the access network device to instruct the access network device to fall back the voice service of the terminal from the 5G network to the 4G network, that is, perform EPS fallback on the voice service of the terminal.
  • the AMF device determines that the current service of the terminal is a voice service and instructs the access network device to perform EPS fallback on it.
  • the terminal can perform voice services without being affected by the capabilities of the base station, wireless network deployment, etc. ,save resources.
  • the AMF device carries the fallback indication in the initial context setup request (initial context setup request) message, and sends the initial context setup request message to the access network device.
  • the network equipment can initiate an EPS fallback according to the instructions of the initial context setup request, so that the terminal is switched or redirected to the EPC, so that the voice service of the terminal can be performed on the 4G network.
  • the AMF device when the voice service of the terminal is the called voice service, the AMF device receives the downlink data notification from the terminal of the SMF device, and then the AMF device determines the downlink data notification and paging The terminal.
  • the AMF device can determine that the first service request message is triggered by the called voice service of the terminal according to the paging reason of the paging.
  • the paging cause is determined by the AMF device according to the paging policy indicator (PPI) sent by the SMF device.
  • PPI paging policy indicator
  • the AMF device sends a paging message to the access network device, the paging message carries a paging reason, and the paging reason is the called voice service of the terminal.
  • the AMF device sends the paging reason to the terminal to inform the terminal that this paging is due to its own called voice service.
  • the first service request message carries a first indication, and the first indication is used to indicate the paging reason; then, the AMF device according to the first indication carried in the first service request message , It is determined that the first service request message is triggered by the called voice service of the terminal.
  • the first indication is carried in the first service request message to inform the AMF device that the SR message is triggered by the called voice service of the terminal, so that the AMF device can initiate the called voice service of the terminal EPS fallback makes the called voice service of the terminal not be affected by the capabilities of the base station, wireless network deployment and other issues, saving resources.
  • the first service request message carries a second indication
  • the second indication is used to indicate that the first service request message is triggered by the calling voice service of the terminal; correspondingly, AMF
  • the device determines that the first service request message is triggered by the calling voice service of the terminal according to the second indication carried in the first service request message.
  • the second indication is carried in the first service request message to inform the AMF device that the SR message is triggered by the calling voice service of the terminal, so that the AMF device can initiate the calling voice service of the terminal EPS fallback makes the calling voice service of the terminal not be affected by the capabilities of the base station, wireless network deployment and other issues, saving resources.
  • this application provides a communication method, including: after the access network device establishes an RRC connection with the terminal for performing voice services, sending a first service request message to the AMF device, the first service request message being used to request The terminal service is performed on the 5G network; the access network device receives the fallback instruction sent by the AMF device; the access network device falls back the voice service of the terminal from the 5G network to the 4G network according to the fallback instruction.
  • the access network device receiving the fallback indication sent by the AMF device includes: the access network device receives the initial context setting request message sent by the AMF device, and the initial context request message carries the fallback instruct.
  • the above method further includes: during the process of establishing the RRC connection, the access network device receives an RRC setup complete (RRC setup complete) message from the terminal, the RRC setup complete message carries a second service request message, and the second service request message carries The third instruction, the third instruction is used to indicate that the second service request is triggered by the voice service of the terminal; the access network device sends the first service request message to the AMF device, including: the access network device requests information according to the second service, Send the first service request message to the AMF device.
  • RRC setup complete RRC setup complete
  • the access network device sends the first service request message to the AMF device, including: the access network device requests information according to the second service, Send the first service request message to the AMF device.
  • the above method further includes: during the process of establishing an RRC connection, the access network device receives an RRC setup request (RRC setup request) message from the terminal, and the RRC setup request message carries the first RRC setup request message.
  • RRC setup request RRC setup request
  • the fourth instruction indicates that the RRC establishment request message is triggered by the voice service of the terminal; the access network device sends the first service request message to the AMF device, including: the access network device receives the RRC establishment complete message sent by the terminal, and the RRC The establishment complete message carries the second service request message sent by the terminal; the access network device sends the first service request message to the AMF device.
  • the above method further includes: the access network device receives a paging message sent by the AMF device, The paging message carries the paging reason, and the paging reason is the called voice service of the terminal; the access network device sends the paging message to the terminal.
  • the third indication or the fourth indication is obtained by the terminal based on the paging reason.
  • this application provides a communication method, including: a terminal receives a paging message from an access network device, the paging message carries a paging reason, and the paging reason is the called voice service of the terminal; The call cause sends a second service request message to the access network device.
  • the terminal sends the second service request message to the access network device according to the paging reason, including: the terminal sends the RRC establishment complete ( RRC setup complete) message, the RRC setup complete message carries a second service request message, the second service request message carries a third indication, and the third indication is obtained based on the paging reason.
  • the terminal sends the RRC establishment complete ( RRC setup complete) message
  • the RRC setup complete message carries a second service request message
  • the second service request message carries a third indication
  • the third indication is obtained based on the paging reason.
  • the above method further includes: the terminal sends the second service request message to the access network device during the establishment of the RRC connection.
  • the RRC setup request message is sent, and the RRC setup request message carries a fourth indication, and the fourth indication is obtained based on the paging reason.
  • the present application provides a communication device.
  • the communication device may be a chip or a system on a chip in an AMF device, and may also be a device used to implement the first aspect or any possible implementation manner of the first aspect in the AMF device.
  • the functional module of the described method may be a chip or a system on a chip in an AMF device, and may also be a device used to implement the first aspect or any possible implementation manner of the first aspect in the AMF device.
  • the communication device includes: a first receiving module, configured to receive a first service request message from an access network device, the first service request message being used to request terminal services on a 5G network; a first processing module , Used to determine that the first service request message is triggered by the voice service of the terminal; the first sending module is used to send a fallback instruction to the access network device, and the fallback instruction is used to instruct the access network device to transfer the voice service of the terminal from the 5G The network fell back to the 4G network.
  • a first receiving module configured to receive a first service request message from an access network device, the first service request message being used to request terminal services on a 5G network
  • a first processing module Used to determine that the first service request message is triggered by the voice service of the terminal
  • the first sending module is used to send a fallback instruction to the access network device, and the fallback instruction is used to instruct the access network device to transfer the voice service of the terminal from the 5G The network fell back to the 4G network.
  • the first sending module is configured to carry the fallback indication in the initial context setting request message, and send the initial context setting request message to the access network device.
  • the above-mentioned apparatus further includes: a second receiving module, configured to receive a downlink data notification from the terminal before the first receiving module receives the first service request message from the access network device ;
  • the first sending module is also used to page the terminal according to the downlink data notification.
  • the first processing module is specifically configured to determine that the first service request message is triggered by the called voice service of the terminal according to the paging reason of the paging.
  • the first sending module is specifically configured to send a paging message to the access network device.
  • the paging message carries a paging reason, and the paging reason is the called voice of the terminal. business.
  • the first service request message carries a first indication, and the first indication is used to indicate the reason for paging; the first processing module is specifically configured to carry The first instruction determines that the first service request message is triggered by the called voice service of the terminal.
  • the first service request message carries a second indication, and the second indication is used to indicate that the first service request message is triggered by the calling voice service of the terminal; the first processing module , Which is specifically used to determine that the first service request message is triggered by the calling voice service of the terminal according to the second indication carried in the first service request message.
  • the present application provides a communication device.
  • the communication device may be a chip or a system-on-chip in an access network device, and may also be used in an access network device to implement the second aspect or any possibility of the second aspect.
  • the communication device includes: a second sending module, configured to send a first service request message to the AMF device after establishing an RRC connection for performing voice services with the terminal, where the first service request message is used for the request message The terminal service is performed on the 5G network; the third receiving module is used to receive the fallback instruction sent by the AMF device; the second processing module is used to fall back the voice service of the terminal from the 5G network to the 4G network according to the fallback instruction.
  • the third receiving module is specifically configured to receive the initial context setting request message sent by the AMF device, and the initial context request message carries a fallback indication.
  • the above-mentioned apparatus further includes: a fourth receiving module, configured to receive an RRC establishment complete message from the terminal in the process of establishing an RRC connection, and the RRC establishment complete message carries the first The second service request message, the second service request message carries a third indication, and the third indication is used to indicate that the second service request is triggered by the voice service of the terminal; the second sending module is specifically used to according to the second service request information, Send the first service request message to the AMF device.
  • a fourth receiving module configured to receive an RRC establishment complete message from the terminal in the process of establishing an RRC connection, and the RRC establishment complete message carries the first The second service request message, the second service request message carries a third indication, and the third indication is used to indicate that the second service request is triggered by the voice service of the terminal
  • the second sending module is specifically used to according to the second service request information, Send the first service request message to the AMF device.
  • the above-mentioned apparatus further includes: a fourth receiving module, configured to receive an RRC establishment request message from the terminal in the process of establishing an RRC connection, and the RRC establishment request message carries a fourth Indication, the fourth indication indicates that the RRC establishment request message is triggered by the voice service of the terminal; the RRC establishment complete message sent by the terminal is received, and the RRC establishment complete message carries the second service request message sent by the terminal; the second sending module uses To send the first service request message to the AMF device.
  • a fourth receiving module configured to receive an RRC establishment request message from the terminal in the process of establishing an RRC connection, and the RRC establishment request message carries a fourth Indication, the fourth indication indicates that the RRC establishment request message is triggered by the voice service of the terminal; the RRC establishment complete message sent by the terminal is received, and the RRC establishment complete message carries the second service request message sent by the terminal; the second sending module uses To send the first service request message to the AMF device.
  • the third receiving module is configured to receive a paging message sent by the AMF device before establishing an RRC connection for voice services with the terminal.
  • the paging message carries a paging message.
  • the paging reason is the called voice service of the terminal; the above-mentioned device further includes: a third sending module, which is used to send a paging message to the terminal.
  • the third indication or the fourth indication is obtained by the terminal based on the paging reason.
  • the present application provides a communication device.
  • the communication device may be a chip or a system on a chip in a terminal, and may also be a terminal used to implement the third aspect or any possible implementation of the third aspect.
  • the functional module of the method includes: a fifth receiving module, configured to receive a paging message from an access network device, the paging message carries a paging reason, and the paging reason is the called voice service of the terminal;
  • the fourth sending module is used to send the second service request message to the access network device according to the paging reason.
  • the fourth sending module is specifically configured to send an RRC setup complete (RRC setup complete) message to the access network device during the process of establishing an RRC connection, and the RRC setup complete message carries There is a second service request message, the second service request message carries a third indication, and the third indication is obtained based on the paging reason.
  • RRC setup complete RRC setup complete
  • the fourth sending device is further configured to send the second service request message to the access network device during the establishment of the RRC connection before the access network device sends the second service request message according to the paging reason.
  • the device sends an RRC setup request message, the RRC setup request message carries a fourth indication, and the fourth indication is obtained based on the paging reason.
  • the present application provides a communication device, including: a processor and a memory; the processor is coupled to the memory, and the processor is configured to read and execute instructions in the memory to implement the first and second aspects as described above. Or the communication method described in any possible implementation manner of the third aspect.
  • the present application provides a communication system, including: a terminal, an AMF device, and an access network device; the AMF device is used to perform the communication as described in the first aspect or any possible implementation manner of the first aspect Method; access network equipment for executing the communication method as described in the second aspect or any possible implementation manner of the second aspect; terminal. It is used to implement the communication method described in the foregoing third aspect or any possible implementation manner of the third aspect.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When the instructions are run on a computer, they are used to execute aspects such as the first to tenth aspects described above or any one of them. The communication method described in the implementation mode.
  • this application provides a computer program or computer program product, which when the computer program or computer program product is executed on a computer, enables the computer to implement the first aspect to the tenth aspect or any possible implementation manner thereof The communication method described.
  • the above-mentioned access network equipment is a base station.
  • FIG. 1 is a schematic structural diagram of a communication system in an embodiment of the application
  • FIG. 2 is a schematic flowchart of a communication method in an embodiment of the application
  • FIG. 3 is a schematic diagram of a method flow of a calling voice service in an embodiment of the application
  • FIG. 4 is a schematic flowchart of a method for called voice service in an embodiment of the application
  • FIG. 5 is a schematic diagram of a structure of a communication device in an embodiment of the application.
  • FIG. 6 is a schematic diagram of another structure of a communication device in an embodiment of the application.
  • FIG. 7 is a schematic diagram of another structure of the communication device in an embodiment of the application.
  • FIG. 8 is a schematic diagram of hardware of an AMF device/access network device in an embodiment of the application.
  • Fig. 9 is a schematic structural diagram of an access network device in an embodiment of the application.
  • the corresponding device may include one or more units such as functional units to perform the described one or more method steps (for example, one unit performs one or more Steps, or multiple units, each of which performs one or more of the multiple steps), even if such one or more units are not explicitly described or illustrated in the drawings.
  • the corresponding method may include one step to perform the functionality of one or more units (for example, one step executes one or more units).
  • UE user equipment
  • voice services there are two ways: long-term evolution voice bearer (voice over long-term evolution, VoLTE) and circuit domain circuit fallback (VoLTE) switched fallback, CS fallback).
  • VoLTE voice over long-term evolution
  • VoIP circuit domain circuit fallback
  • CS fallback circuit domain circuit fallback
  • the UE can carry an additional service request (extended service request, ESR) to the core network device when initiating a voice service, and directly initiate a CS fallback.
  • ESR extended service request
  • VoNR new wireless voice bearer
  • EPS fallback evolved packet system fallback
  • the VoNR method means that the 5G access network and the core network provide voice services based on the IP multiple subsystem (IMS)
  • IMS IP multiple subsystem
  • the EPS fallback scheme means that the UE falls back to the EPS ( The fourth-generation mobile communication technology (4G)), which implements voice services through 4G networks.
  • 4G fourth-generation mobile communication technology
  • Fig. 1 is a schematic structural diagram of a communication system in an embodiment of the application.
  • the 4G network may be a long term evolution (LTE) network.
  • 4G communication network includes 4G access network and 4G core network (core network, CN), 4G core network can be EPC network, 4G access network can include evolved-universal terrestrial radio access network , E-UTRAN).
  • E-UTRAN evolved-universal terrestrial radio access network
  • UE, E-UTRAN, and EPC can form an evolved packet system (EPS).
  • EPS evolved packet system
  • the core network may include mobility management entity (mobility management entity, MME), serving gateway (serving gateway, SGW), packet data network gateway (packet data network gateway, PGW), policy and charging rule functions ( policy and charging rules function, PCRF) equipment and home subscriber server (HSS).
  • MME mobility management entity
  • serving gateway serving gateway
  • SGW packet data network gateway
  • PGW packet data network gateway
  • policy and charging rule functions policy and charging rules function, PCRF
  • PCRF home subscriber server
  • the above-mentioned 5G communication network may include a 5G access network (AN) and a 5G core network (5GC).
  • the 5G access network may include a next generation radio access network (NGRAN).
  • the 5G core network may include: AMF equipment, user plane function (UPF) equipment, session management function (SMF) equipment, policy control function (PCF) equipment, unified data management (unified) data management, UDM) equipment, etc.
  • HSS and UDM can be deployed in one, denoted by HSS+UDM.
  • the UDM function can be added to the HSS, or the HSS function can be added to the UDM, or the HSS and UDM functions can be implemented in another device at the same time.
  • HSS and UDM can also be deployed separately, and the two are in communication connection, which is not limited in the embodiment of the present application.
  • PCRF and PCF can be deployed together, represented by PCRF+PCF.
  • the PCF function can be added to the PCRF, or the PCRF function can be added to the PCF, or the functions of the PCRF and the PCF can be implemented in another device at the same time.
  • PCRF and PCF can also be deployed separately, and the two are in communication connection, which is not limited in the embodiment of the present application.
  • SMF and PGW-C (PGW control plane function) can be deployed together, denoted by SMF+PGW-C.
  • the PGW-C function can be added to the SMF, or the SMF function can be added to the PGW-C, or the SMF and PGW-C functions can be implemented simultaneously on another device.
  • SMF and PGW-C can also be deployed separately, and the two are in communication connection, which is not limited in the embodiment of the present application.
  • UPF and PGW-U can be deployed together, represented by UPF+PGW-C.
  • the PGW-U function can be added to the UPF, or the UPF function can be added to the PGW-U, or the functions of the UPF and the PGW-U can be implemented in another device at the same time.
  • UPF and PGW-U can also be deployed separately, and the two are in communication connection, which is not limited in the embodiment of the present application.
  • the foregoing 4G network and 5G network may also include other devices, which are not specifically limited in the embodiment of the present application.
  • the UE can access the 5G core network through the 3rd generation partnership project (3rd generation partnership project, 3GPP) technology and/or non-3GPP technology.
  • the UE can access the 5G core network through 3GPP access network equipment, and can also access the 5G core network through non-3GPP access network equipment and gateway equipment.
  • the non-3GPP access network equipment may be a wireless access point (WAP) in a wireless local area network (WLAN), and world interoperability for microwave access (world interoperability). for microwave access (WiMAX) access equipment, code division multiple access (CDMA) network switches or routers, etc.
  • the gateway device may be a non-3GPP interworking function (N3IWF) device, etc.
  • UDM equipment has the function of unified data management. Mainly responsible for the management of contract data, user access authorization and other functions.
  • the PCF device has a policy control function, and is mainly responsible for related policy decisions such as charging policies for sessions and service flows, QoS bandwidth guarantees and policies.
  • the PCF connected to the AMF device and the SMF device correspond to AM PCF (PCF for Access and Mobility Control) and SM PCF (PCF for Session Management), respectively, and may not be the same PCF entity in actual deployment scenarios.
  • the SMF device has a session management function, which mainly performs functions such as session management, execution of PCF issuing control policies, selection of UPF, and Internet protocol (IP) address allocation of UEs.
  • session management mainly performs functions such as session management, execution of PCF issuing control policies, selection of UPF, and Internet protocol (IP) address allocation of UEs.
  • IP Internet protocol
  • AMF equipment has access and mobility management functions, mainly for mobility management, access authentication/authorization and other functions. In addition, it is also responsible for transferring user policies between UE and PCF.
  • the UPF device is the user plane functional entity, as an interface with the data network, completes the functions of user plane data forwarding, session/stream-based billing statistics, and bandwidth limitation.
  • N7 The interface between PCF and SMF, used to issue packet data unit (packet data unit, PDU) session granularity and control strategy of service data flow granularity.
  • PDU packet data unit
  • N3 The communication interface between UPF+PGW-U and NG-RAN.
  • N15 The interface between PCF and AMF, used to issue UE policies and access control related policies.
  • N4 The interface between SMF and UPF, used to transfer information between the control plane and the user plane, including controlling the issuance of user-oriented forwarding rules, QoS control rules, traffic statistics rules, etc., and user-plane information reporting.
  • N11 The interface between SMF and AMF, used to transfer PDU session tunnel information between RAN and UPF, transfer control messages sent to UE, transfer radio resource control information sent to RAN, etc.
  • N2 The interface between AMF and RAN, used to transfer radio bearer control information from the core network side to the RAN.
  • N1 The interface between the AMF and the UE, which has nothing to do with access, and is used to transfer QoS control rules to the UE.
  • N8 The interface between AMF and UDM, used for AMF to obtain access and mobility management related subscription data and authentication data from UDM, and AMF to register UE current mobility management related information with UDM, etc.
  • N10 The interface between SMF and UDM, used for SMF to obtain session management related subscription data from UDM, and SMF to register UE current session related information with UDM, etc.
  • N26 The interface between MME and AMF, used to transfer the mobility management status and session management status between the source network and the target network during the interoperability of the 4G network and the 5G network.
  • S6a The communication interface between MME and HSS+UDM.
  • S11 Communication interface between MME and SGW.
  • S1-MME The communication interface between MME and E-UTRAN.
  • S1-U The communication interface between E-UTRAN and SGW.
  • S5-C The communication interface of the control plane between SGW and SMF+PGW-C.
  • S5-U User plane communication interface between SGW and UPF+PGW-U.
  • the UE in the embodiment of this application is a terminal device with wireless communication function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships Etc.); it can also be deployed in the air (for example, on airplanes, balloons, and satellites).
  • the above-mentioned terminal equipment may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, an industrial control (industrial) control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, and transportation safety (transportation safety) Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, and so on.
  • the terminal device may also be a handheld device with a wireless communication function, a vehicle-mounted device, a wearable device, a computing device, or other processing device connected to a wireless modem.
  • terminal devices can be called different names, such as: terminal device, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication Device, user agent or user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), Terminal equipment in 5G network or future evolution network, etc.
  • terminal device access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication Device, user agent or user device, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), Terminal equipment in 5G network or future evolution network, etc.
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • each device In the communication system shown in FIG. 1, the functions and interfaces of each device are only exemplary. When each device is applied to the embodiment of the present application, not all functions are necessary. All or part of the devices of the core network may be physical physical devices or virtualized devices, which are not limited here. Of course, the communication system in the embodiment of the present application may also include other devices not shown in FIG. 1, which is not limited here.
  • the UE may not be able to perform voice services in the 5G network in VoNR mode. Then, in order to implement the voice service of the UE, the network can perform EPS fallback for the UE. .
  • the user equipment (UE) first registers with 5G, establishes an IMS PDU session (session), and successfully registers with the IMS, and then the UE enters an idle state.
  • the terminal When there is a voice service, the terminal first tries to establish a corresponding quality of service flow (QoS flow) for the voice service on the 5G network.
  • QoS flow quality of service flow
  • the terminal executes EPS fallback.
  • the above process of trying to establish a QoS flow will add unnecessary delay and increase signaling overhead.
  • the embodiments of the present application provide a communication method, which can be applied to a 5G network, and the 5G network and the 4G network can interoperate.
  • the access network equipment refers to the access network equipment of the 5G network, such as the base station (eg, gNB) of the 5G network.
  • FIG. 2 is a schematic flowchart of a communication method in an embodiment of this application.
  • the method may include:
  • S201 The terminal (UE) establishes an RRC connection for the voice service with the access network equipment;
  • the voice service of the terminal refers to the calling voice service initiated by the terminal, and may also refer to the called voice service of the calling terminal.
  • the UE may be a UE registered on a 5G network.
  • S202 The UE sends a second service request SR message to the access network device
  • the second SR message is triggered by the UE according to the calling voice service or the called voice service.
  • the access network device sends the first SR message to the AMF device according to the second SR message;
  • the first SR message may be a second SR message transparently transmitted by the access network device, or the first SR message may also be an SR message generated by the access network device in response to the second SR message, which is not specifically limited in the embodiment of the present application.
  • the AMF device determines that the first SR message is triggered by the voice service of the UE;
  • the second SR message is triggered by the UE according to the calling voice service or the called voice service. It is understandable that the first SR message is also Triggered by the UE based on the calling voice service or the called voice service.
  • the AMF device sends a fallback instruction to the access network device
  • the access network device falls back the voice service of the UE from 5G to 4G according to the fallback instruction.
  • the access network device can send a handover request to the AMF device, and the AMF device responds to the handover request to start the handover process and switch the UE to the 4G network so that the UE can perform voice services in the 4G network; or, the access network device can also send The redirection request is sent to the AMF device, and the AMF device responds to the redirection request to initiate a redirection process to redirect the UE to the 4G network, so that the UE can perform voice services in the 4G network.
  • Fig. 3 is a schematic flow chart of a method for calling voice service in an embodiment of the application. As shown in Fig. 3, the method may include:
  • S301 The UE randomly accesses gNB (access network equipment);
  • the UE After the UE is turned on, it will attach to the 5G network, and then establish an IMS PDU session and register with the IMS, and the UE will enter an idle state. Before a UE in an idle state prepares to initiate an IMS voice service to another UE, it first triggers the establishment of an RRC connection with the NG RAN. The UE sends a random access preamble (random access preamble) to the gNB, and monitors the physical downlink control channel (PDCCH) in the RAR time window (RA response window) to receive the radio network temporary identification (radio network). tempory identity, RA-RNTI) corresponding to the random access response RAR. The UE accesses the gNB after receiving the RAR.
  • a random access preamble random access preamble
  • RA response window the RAR time window
  • RA-RNTI radio network temporary identification
  • RRC setup request RRC setup request
  • RRC setup (RRC setup) message sent by the gNB to the UE;
  • RRC setup complete RRC setup complete
  • the RRC setupcomplete may carry the second SR message.
  • the UE may configure the RRC establishment cause in the RRC setup request as the fourth indication (such as MO-VoiceCall) and carry it in In the RRC setup request of S302, it informs the gNB that the UE is ready to initiate the IMS calling voice service.
  • the fourth indication is used to indicate that the RRC setup request is triggered by the UE's calling voice service.
  • the second SR message is triggered by the UE's calling voice service
  • the third indication (such as MO-VoiceCall) can be carried in the RRC setupcomplete of S304 and sent to the gNB.
  • the third indication is used to indicate that the second SR message is triggered by the UE's calling voice service.
  • connection state connection
  • S305 The gNB sends the first SR message to the AMF device
  • the first SR message may carry a second indication
  • the second indication may be used to indicate that the first SR message is triggered by the calling service of the terminal
  • the second indication may be MO-VoiceCall.
  • the gNB After determining that the second SR message is triggered by the UE's calling voice service according to the second SR message sent by the UE, the gNB sends the first SR message to the AMF device.
  • the UE sends a fourth instruction (ie MO-VoiceCall) to the gNB during the process of establishing an RRC connection with the gNB.
  • a fourth instruction ie MO-VoiceCall
  • the gNB may send the fourth instruction
  • the four instructions (such as the second instruction) are directly and transparently transmitted to the AMF device; or, the gNB can also create the second instruction according to the fourth instruction, which is not specifically limited in the embodiment of the present application.
  • the AMF device determines that the first SR message is triggered by the UE's calling voice service
  • the AMF device can determine that the current SR message process is triggered by the UE’s calling voice service according to the second indication carried in the first SR message, namely MO-VoiceCall, and the AMF device determines The UE's calling voice service falls back from the 5G network to the 4G network, that is, EPS fallback is performed on the UE's calling voice service.
  • the AMF device can perform EPS fallback on the UE’s voice service, that is, the AMF device can determine that the first SR message is triggered by the UE’s calling voice service , The gNB can be instructed to perform EPS fallback on the UE's calling voice service, and then the AMF device performs S307.
  • the AMF device sends a fallback indication to the gNB;
  • the AMF device may carry a fallback indicator, such as an EPS fallback indicator, in an initial context setup request (initial context setup request), and send the initial context setup request to the gNB.
  • a fallback indicator such as an EPS fallback indicator
  • the AMF device in addition to performing EPS fallback on the UE’s calling voice service as described above, can also be based on other policies, such as gNB capabilities, operating status, operator policies, wireless network deployment, etc. Determine whether to perform EPS fallback for the UE’s calling voice service. If yes, perform S307. If not, the AMF device can also send a request message to the gNB to request the establishment of a QoS Flow for the UE’s calling voice service. The UE's calling voice service is completed in the network.
  • policies such as gNB capabilities, operating status, operator policies, wireless network deployment, etc. Determine whether to perform EPS fallback for the UE’s calling voice service. If yes, perform S307. If not, the AMF device can also send a request message to the gNB to request the establishment of a QoS Flow for the UE’s calling voice service. The UE's calling voice service is completed in the network.
  • the AMF device determines not to perform EPS fallback for the UE’s calling voice service; or, if the AMF device learns that the gNB only supports EPS fallback according to the local policy, the AMF device determines that the UE only supports EPS fallback.
  • the calling voice service executes EPS fallback. If the AMF device learns that the gNB is in an overload state, it performs EPS fallback on the UE's calling voice service.
  • the AMF device can also determine whether to perform EPS fallback on the UE's calling voice service according to other conditions, which is not specifically limited here.
  • S308 The gNB initiates a handover process or a redirection process according to the fallback instruction
  • the gNB sends RRC reconfiguration to the UE to modify the RRC connection so that the UE is switched or redirected to the EPC.
  • S309 UE handover or redirection to EPS
  • the UE performs handover or redirection according to RRC reconfiguration, and then the UE sends RRC reconfiguration complete to the gNB to complete the RRC reconfiguration.
  • S310 The UE initiates an IMS voice service in the EPS.
  • the foregoing is the calling voice service process for the UE to initiate a voice call.
  • Fig. 4 is a schematic flowchart of a called voice service method in an embodiment of this application. As shown in Fig. 4, the method may include:
  • the UPF device receives a request for sending a downlink message (SIP INVITE) from the IMS;
  • SIP INVITE downlink message
  • the IMS domain sends a downlink message sending request to the 5GC of the called UE.
  • the request includes the SIP INVITE message.
  • the UPF device can also be The type of service (TOS) (IPv4) or text convention (TC) (IPv6) value of the (internet protocol, IP) header includes the differentiated services code point (DSCP), and the DSCP is carried in the DDN and sent to SMF equipment.
  • TOS type of service
  • TC text convention
  • DSCP differentiated services code point
  • the SMF device notifies the AMF device of the downlink service of the UE according to the DDN message;
  • the SMF device can determine a paging policy indicator (PPI) based on the DSCP, and carry the PPI in the N11 message Sent to the AMF device, so that the AMF device learns the UE's voice service according to the PPI.
  • PPI paging policy indicator
  • allocation retention priority allocation retention priority, ARP
  • the AMF device determines that the downlink service is an IMS voice service
  • S405 The AMF device pagings the UE and sends a paging message to the gNB;
  • the AMF device sends a paging message to the gNB, and the paging message can carry the above-mentioned paging reason (MT-Voice) to inform the UE that this paging is due to its own called voice service.
  • MT-Voice paging reason
  • the gNB sends the paging message to the UE;
  • the UE sends an RRC setup request to the gNB;
  • the gNB sends RRC setup to the UE;
  • S409 The UE sends RRC setup complete to the gNB;
  • the RRC setup complete may carry the second SR message.
  • the UE may configure the RRC establishment cause in the RRC setup request as the fourth indication (e.g. MT-VoiceCall) and carried in the RRC setup request of S407.
  • the fourth indication is used to indicate that the RRC setup request is triggered by the called voice service of the UE.
  • the second SR message is triggered by the UE's called voice service
  • the third indication (such as MT-VoiceCall) can be carried in the RRC setup complete of S409 and sent to the gNB.
  • the third indication is used to indicate that the second SR message is triggered by the called voice service of the UE.
  • the third instruction and the fourth instruction may correspond to different specific values in different voice service scenarios.
  • the value of the third indication and the value of the fourth indication may be MO-VoiceCall
  • the value of the third indication and the value of the fourth indication may be MT -VoiceCall.
  • connection state connection
  • S410 The gNB sends the first SR message to the AMF device
  • the first SR message may carry a first indication (MT-VoiceCall), and the first indication is used to indicate the paging reason of this paging.
  • MT-VoiceCall a first indication
  • the gNB After determining that the second SR message is triggered by the called voice service of the UE according to the first indication sent by the UE, the gNB sends the first SR message to the AMF device.
  • the UE sends a third instruction or a fourth instruction (MT-VoiceCall) to the gNB during the process of establishing an RRC connection with the gNB, and the gNB receives the third instruction or the first instruction.
  • the third instruction or the fourth instruction can be directly transparently transmitted to the AMF device; or the gNB can also create the first instruction according to the third instruction or the fourth instruction, which is not specifically limited in the embodiment of the present application.
  • the AMF device determines that the first SR message is triggered by the called voice service of the UE;
  • the AMF device can determine that the current SR message process is triggered by the called voice service of the UE according to the first indication carried in the first SR message, namely MT-VoiceCall, and the AMF device determines The called voice service of the UE falls back from the 5G network to the 4G network, that is, EPS fallback is performed on the called voice service of the UE.
  • the AMF device can perform EPS fallback on the voice service of the UE, that is, the AMF device can determine that the first SR message is the called party of the UE. After the voice service is triggered, the gNB can be instructed to perform EPS fallback on the UE's called voice service, and then the AMF device performs S412.
  • the AMF device sends a fallback instruction to the gNB;
  • the AMF device may carry a fallback indicator, such as an EPS fallback indicator, in the initial context setup request, and send the initial context setup request to the gNB.
  • a fallback indicator such as an EPS fallback indicator
  • the AMF device in addition to performing EPS fallback on the UE’s called voice service, can also determine whether or not it is based on other strategies, such as gNB capabilities, operating status, operator policies, and wireless network deployment. Perform EPS fallback for the called voice service of the UE. If yes, perform S412. If not, the AMF device can also send a request message to the gNB to request the establishment of a QoS Flow for the called voice service for the UE, and then in the 5G network Complete the called voice service of the UE.
  • other strategies such as gNB capabilities, operating status, operator policies, and wireless network deployment.
  • the process of the AMF device determining whether to perform EPS fallback for the UE's called voice service according to the policy is similar to the process of the AMF device determining whether to perform EPS fallback for the UE's calling voice service according to the policy in the above embodiment, and will not be repeated here. .
  • S413 The gNB initiates a handover process or a redirection process according to the fallback instruction
  • PGW-U sends SIP INVITE to UE through EPC;
  • S416 The UE responds to the SIP INVITE to perform the called voice service on the EPC.
  • the foregoing is the called voice service process for the UE to initiate a voice call.
  • the AMF device determines that the paging cause of this paging is the called voice service of the UE. After that, the AMF device can record the paging reason of this paging, and then in S404 After that, the AMF device may not carry the paging reason in the paging message when performing S405. Then, in the process of establishing the RRC connection in the following S407 to S409, the UE may not send the third instruction and/or the fourth instruction to the gNB, but send the second SR message in the general format to the gNB, so that the gNB can It is determined that the second SR message is triggered by the service of the UE, but it is not clear which service it is. The gNB sends the first SR message to the AMF device according to the second SR message. At this time, the first SR message does not carry the first indication.
  • S411 may include: the AMF device determines, according to local records, that the first SR message is triggered by the called voice service of the UE. It is understandable that after receiving the first SR message, the AMF device can query the local record to obtain the paging reason corresponding to the UE, thereby knowing that the first SR message is triggered by the called voice service of the UE. Next, execute From S412 to S416, the called voice service of the UE is dropped from the 5G network to the 4G network. The specific process is not repeated here.
  • the AMF device records the paging reason of this paging, and can carry the paging reason in the paging message when performing S405, and establishes in the following S407 to S409
  • the UE may not send the third indication and/or the fourth indication to the gNB, but instead send the second SR message in the general format to the gNB.
  • the gNB can determine that the second SR message is triggered by the service of the UE, but it is not clear which service it is.
  • the gNB sends the first SR message to the AMF device according to the second SR message. At this time, the first SR message does not carry the first indication either.
  • S411 may include: the AMF device determines that the first SR message is triggered by the called voice service of the UE according to the local record, that is, the previous record, to obtain the paging cause. It is understandable that the AMF device is receiving the first SR After the message, you can query the local records to obtain the paging reason corresponding to the UE, so that you know that the first SR message is triggered by the UE's called voice service. Next, perform S412 to S416 to change the UE's called voice service from The 5G network has fallen back to the 4G network, and the specific process will not be repeated here.
  • the AMF device can record the paging reason of this paging when performing S404. Then, when the AMF device is paging the UE, it does not need to inform the UE of the paging reason, so that the UE can judge to perform the EPS fallback. The process is transparent, reducing the impact on the UE.
  • FIG. 5 is a schematic structural diagram of a communication device in an embodiment of the application. As shown in FIG.
  • the communication device 500 may include: a first receiving module 501, configured to receive a The first service request message, the first service request message is used to request the service of the terminal on the 5G network; the first processing module 502 is used to determine that the first service request message is triggered by the voice service of the terminal; the first sending module 503 , Used to send a fallback instruction to the access network device, and the fallback instruction is used to instruct the access network device to fall back the voice service of the terminal from the 5G network to the 4G network.
  • a first receiving module 501 configured to receive a The first service request message, the first service request message is used to request the service of the terminal on the 5G network
  • the first processing module 502 is used to determine that the first service request message is triggered by the voice service of the terminal
  • the first sending module 503 Used to send a fallback instruction to the access network device, and the fallback instruction is used to instruct the access network device to fall back the voice service of the terminal from the 5G network to the 4G network.
  • the first sending module is configured to carry the fallback indication in the initial context setting request message, and send the initial context setting request message to the access network device.
  • the foregoing apparatus further includes: a second receiving module, configured to receive a downlink data notification from the terminal before the first receiving module receives the first service request message from the access network device; and a first sending module It is also used to page the terminal according to the downlink data notification.
  • the first processing module is specifically configured to determine that the first service request message is triggered by the called voice service of the terminal according to the paging reason of the paging.
  • the first sending module is specifically configured to send a paging message to the access network device, the paging message carries a paging reason, and the paging reason is the called voice service of the terminal.
  • the first service request message carries a first indication, and the first indication is used to indicate the reason for paging; the first processing module is specifically configured to, according to the first indication carried in the first service request message, It is determined that the first service request message is triggered by the called voice service of the terminal.
  • the first service request message carries a second indication
  • the second indication is used to indicate that the first service request message is triggered by the calling voice service of the terminal
  • the first processing module is specifically used to The second indication carried in the first service request message determines that the first service request message is triggered by the calling voice service of the terminal.
  • the first sending module may be a sending circuit, a sending interface, or a transmitter; the first receiving module and the second receiving module may be a receiving circuit, a receiving interface, or a receiver; the first processing module may be one or Multiple processors.
  • FIG. 6 is a schematic diagram of another structure of the communication device in the embodiment of the application.
  • the communication device 600 may include: a second sending module 601, which is used to establish a connection between the communication device and the terminal.
  • the first service request message is sent to the AMF device, the first service request message is used to request the message to perform terminal services on the 5G network; the third receiving module 602 is used to receive the fallback indication sent by the AMF device ; The second processing module 603 is configured to fall back the voice service of the terminal from the 5G network to the 4G network according to the fallback instruction.
  • the third receiving module is specifically configured to receive the initial context setting request message sent by the AMF device, and the initial context request message carries a fallback indication.
  • the above-mentioned apparatus further includes: a fourth receiving module, configured to receive an RRC establishment complete message from the terminal in the process of establishing an RRC connection, where the RRC establishment complete message carries a second service request message, The second service request message carries a third indication, and the third indication is used to indicate that the second service request is triggered by the voice service of the terminal; the second sending module is specifically used to send the second service request information to the AMF device according to the second service request information.
  • a service request message configured to receive an RRC establishment complete message from the terminal in the process of establishing an RRC connection, where the RRC establishment complete message carries a second service request message, The second service request message carries a third indication, and the third indication is used to indicate that the second service request is triggered by the voice service of the terminal; the second sending module is specifically used to send the second service request information to the AMF device according to the second service request information.
  • a service request message configured to receive an RRC establishment complete message from the terminal in the process of establishing an RRC
  • the above-mentioned apparatus further includes: a fourth receiving module, configured to receive an RRC establishment request message from the terminal in the process of establishing an RRC connection, the RRC establishment request message carries a fourth indication, the fourth indication Indicates that the RRC establishment request message is triggered by the voice service of the terminal; receives the RRC establishment complete message sent by the terminal, and the RRC establishment complete message carries the second service request message sent by the terminal; the second sending module is used to send to the AMF device The first service request message.
  • a fourth receiving module configured to receive an RRC establishment request message from the terminal in the process of establishing an RRC connection, the RRC establishment request message carries a fourth indication, the fourth indication Indicates that the RRC establishment request message is triggered by the voice service of the terminal; receives the RRC establishment complete message sent by the terminal, and the RRC establishment complete message carries the second service request message sent by the terminal; the second sending module is used to send to the AMF device The first service request message.
  • the third receiving module is configured to receive a paging message sent by the AMF device before establishing an RRC connection for voice service with the terminal.
  • the paging message carries the paging reason, and the paging message The reason is the called voice service of the terminal; the above device also includes: a third sending module, which is used to send a paging message to the terminal.
  • the third instruction or the fourth instruction is obtained by the terminal based on the paging reason.
  • the second sending module and the third sending module may be a sending circuit, a sending interface, or a transmitter; the third receiving module and the fourth receiving module may be a receiving circuit, a receiving interface, or a receiver; the second processing The module can be one or more processors.
  • FIG. 7 is another schematic structural diagram of the communication device in the embodiment of this application.
  • the paging message contains the paging reason, and the paging reason is the called voice service of the terminal; the fourth sending module 702 is configured to send the second service request message to the access network device according to the paging reason.
  • the fourth sending module is specifically configured to send an RRC setup complete (RRC setup complete) message to the access network device during the process of establishing an RRC connection.
  • the RRC setup complete message carries the second service request.
  • the second service request message carries a third indication, and the third indication is obtained based on the paging reason.
  • the fourth sending means is further configured to send an RRC establishment request to the access network device during the process of establishing the RRC connection before the access network device sends the second service request message according to the paging reason
  • the (RRC setup request) message the RRC setup request message carries a fourth indication, and the fourth indication is obtained based on the paging reason.
  • the fourth sending module may be a sending circuit, a sending interface, or a transmitter; the fifth receiving module and the second receiving module may be a receiving circuit, a receiving interface, or a receiver.
  • FIG. 8 is a schematic diagram of the hardware of the AMF device and the access network device in the embodiment of the application. As shown in FIG. 8, the AMF device and the access network device provided in the embodiment of the application both use general computer hardware, including a processor 801, a memory 802, a bus 803, an input device 804, and an output device 805.
  • the memory 802 may include a computer storage medium in the form of a volatile and/or non-volatile memory, such as a read-only memory and/or a random access memory.
  • the memory 802 can store an operating system, application programs, other program modules, executable code, program data, user account opening data, user subscription data, and the like.
  • the input device 804 can be used to input commands and information to the AMF device/access network device.
  • the input device 804 is such as a keyboard or pointing device, such as a mouse, trackball, touchpad, microphone, joystick, game pad, satellite TV antenna, scanning Instrument or similar equipment. These input devices can be connected to the processor 801 through the bus 803.
  • the output device 805 can be used to output information from AMF devices/access network devices.
  • the output device 805 can also provide other peripheral output devices, such as speakers and/or printing devices, and these output devices can also pass through the bus 703 Connect to the processor 801.
  • the AMF device/access network device may be connected to the network through the network interface 806, for example, connected to a local area network (LAN).
  • LAN local area network
  • the computer-executed instructions stored in the AMF device/access network device can be stored in a remote storage device, not limited to local storage.
  • the AMF device executes the method steps on the AMF device side in the above embodiment, for example, executes S204, S205, S306, S307, S404 , S405, S411, S412, etc.
  • the specific execution process refer to the above-mentioned embodiment, which will not be repeated here.
  • the access network device can execute the steps of the method on the access network device side in the above embodiment, for example, perform step S203, S206, S303, S305, S308, S309, S406, S408, S410, S413, etc.
  • step S203 For the specific execution process, refer to the above-mentioned embodiment, which will not be repeated here.
  • the aforementioned memory 802 stores computer-executable instructions for realizing the functions of the first receiving module 501, the first processing module 502, and the first sending module 503 in FIG. 5.
  • the functions/implementation processes of the first receiving module 501, the first processing module 502, and the first sending module 503 in FIG. 5 can all be implemented by calling the computer execution instructions stored in the memory 802 by the processor 801 in FIG.
  • the memory 802 stores computer-executable instructions for realizing the functions of the second sending module 601, the third receiving module 602, and the second processing module 603 in Fig. 6.
  • the functions/implementation processes of the second sending module 601, the third receiving module 602, and the second processing module 603 in FIG. 6 can be implemented by the processor 801 in FIG.
  • the processor 801 in FIG. For functions, refer to the above-mentioned related embodiments.
  • FIG. 9 is a schematic structural diagram of the access network device in an embodiment of the application.
  • the access network device may It is the gNB described in the above embodiment.
  • the access network device may include a transceiver 901 and a controller/processor 902.
  • the transceiver 901 may be used to support the sending and receiving of information between the access network device and the UE described in the foregoing embodiment, and to support radio communication between the UE and other UEs.
  • the controller/processor 902 may be used to perform various functions for communicating with UEs or other network devices.
  • the uplink signal from the UE is received via the antenna, mediated by the transceiver 901, and further processed by the controller/processor 902 to restore the service data and signaling information sent by the UE.
  • service data and signaling messages are processed by the controller/processor 902, and mediated by the transceiver 901 to generate a downlink signal, which is transmitted to the UE via an antenna.
  • the controller/processor 902 is also configured to execute the communication method described in the foregoing embodiment, and according to the fallback instruction sent by the AMF device, fall back the voice service of the UE from the 5G network to the 4G network.
  • the controller/processor 902 may also be used to execute the processing procedures related to the access network equipment in FIGS.
  • the access network device may also include a memory 903, which may be used to store program codes and data of the access network device.
  • the access network device may also include a communication unit 904, configured to support the access network device to communicate with other network entities. For example, it is used to support communication between the access network device and the AMF device and the UE.
  • FIG. 9 only shows a simplified design of the access network device.
  • the access network equipment may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all the access network equipment that can implement the embodiments of this application are in this application. Within the protection scope of the application embodiments.
  • the embodiments of the present application provide a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When the instructions run on a computer, they are used to execute the above-mentioned embodiments and any possible implementations thereof. Method of the communication method.
  • the embodiments of the present application provide a computer program or computer program product.
  • the computer program or computer program product is executed on a computer, the computer realizes the same as the above-mentioned embodiments and any possible implementation manners. ⁇ The communication method.
  • the computer-readable medium may include a computer-readable storage medium, which corresponds to a tangible medium, such as a data storage medium, or a communication medium that includes any medium that facilitates the transfer of a computer program from one place to another (for example, according to a communication protocol) .
  • a computer-readable medium may generally correspond to (1) a non-transitory tangible computer-readable storage medium, or (2) a communication medium, such as a signal or carrier wave.
  • Data storage media may be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and/or data structures for implementing the techniques described in this application.
  • the computer program product may include a computer-readable medium.
  • such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or structures that can be used to store instructions or data Any other media that can be accessed by the computer in the form of desired program code. And, any connection is properly termed a computer-readable medium.
  • any connection is properly termed a computer-readable medium.
  • coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave to transmit instructions from a website, server, or other remote source
  • coaxial cable Wire, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of media.
  • the computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other temporary media, but are actually directed to non-transitory tangible storage media.
  • magnetic disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVD) and Blu-ray disks, where disks usually reproduce data magnetically, while optical disks use lasers to reproduce data optically data. Combinations of the above should also be included in the scope of computer-readable media.
  • DSP digital signal processors
  • ASIC application-specific integrated circuits
  • FPGA field programmable logic arrays
  • DSP digital signal processors
  • ASSIC application-specific integrated circuits
  • FPGA field programmable logic arrays
  • DSP digital signal processors
  • ASIC application-specific integrated circuits
  • FPGA field programmable logic arrays
  • processor may refer to any of the foregoing structure or any other structure suitable for implementing the techniques described herein.
  • the functions described by the various illustrative logical blocks, modules, and steps described herein may be provided in dedicated hardware and/or software modules configured for encoding and decoding, or combined Into the combined codec.
  • the technology may be fully implemented in one or more circuits or logic elements.
  • the technology of this application can be implemented in a variety of devices or devices, including wireless handsets, integrated circuits (ICs), or a set of ICs (for example, chipsets).
  • ICs integrated circuits
  • a set of ICs for example, chipsets.
  • Various components, modules, or units are described in this application to emphasize the functional aspects of the device for implementing the disclosed technology, but they do not necessarily need to be implemented by different hardware units.
  • various units can be combined with appropriate software and/or firmware in the codec hardware unit, or by interoperating hardware units (including one or more processors as described above). supply.

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  • Mobile Radio Communication Systems (AREA)

Abstract

本申请提供一种通信方法、设备及系统。该方法可以包括：AMF设备接收来自接入网设备的第一服务请求消息，第一服务请求消息用于请求在5G网络进行终端的业务；AMF设备确定第一服务请求消息是由终端的语音业务触发的；AMF设备向接入网设备发送回落指示，回落指示用于指示接入网设备将终端的语音业务由5G网络回落至4G网络。在本申请中，AMF设备通过确定终端的当前业务为语音业务，指示接入网设备对其执行EPS fallback，如此，终端可以进行语音业务，而无需受基站的能力、无线网络部署等问题的影响。

Description

一种通信方法、设备及系统
本申请要求于2020年5月21日提交中国国家知识产权局、申请号为202010437779.9、申请名称为“一种通信方法、设备及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，特别涉及一种通信方法、设备及系统。
背景技术
5G(第五代移动通信技术)网络中采用新无线承载语音(voice over new radio，VoNR，)来实现用户设备(user equipment，UE)的语音业务。其中，VoNR的方式是指由5G接入网和核心网提供基于IP多媒体子系统(IP multiple subsystem，IMS)的语音业务。
目前，由于基站的能力、无线网络部署等问题，导致UE在5G网络上无法以VoNR的方式进行语音业务，此时，如何实现UE的语音业务成为了一个亟待解决的问题。
发明内容
本申请提供了一种通信方法、设备及系统，以实现UE的语音业务。
第一方面，本申请提供一种通信方法，该方法可以应用于通信系统中的AMF设备，在该通信系统的系统架构下，5G网络可以与4G网络互操作。那么，在UE进行语音业务时，首先，接入和移动性管理功能(access and mobility management function，AMF)设备接收来自接入网设备的第一服务请求(servicerequest，SR)消息，第一SR消息用于请求在5G网络进行终端的业务。然后，AMF设备确定第一SR消息是由终端的语音业务触发的，这里，语音业务可以为主叫语音业务，也可以为被叫语音业务。最后，AMF设备向接入网设备发送回落指示，以指示接入网设备将终端的语音业务由5G网络回落至4G网络，也就是对终端的语音业务执行EPS fallback。
在本申请中，AMF设备通过确定终端的当前业务为语音业务，指示接入网设备对其执行EPS fallback，如此，终端可以进行语音业务，而无需受基站的能力、无线网络部署等问题的影响，节约资源。进一步地，当终端处于空闲态时，在对终端的语音业务执行EPS fallback的场景下，可以通过减少在5GC建立语音5QI＝1的QoS Flow的过程，从而缩短EPS fallback的呼叫建立时延。
基于第一方面，在一些可能的实施方式中，AMF设备将回落指示携带在初始上下文设置请求(initial context setup request)消息中，并向接入网设备发送初始上下文设置请求消息，这样，接入网设备在收到initial context setup request后，就可以根据initial context setup request的指示，发起EPS fallback，使得终端切换或者重定向至EPC，进而实现终端的语音业务在4G网络中进行。
基于第一方面，在一些可能的实施方式中，当终端的语音业务为被叫语音业务时，AMF设备接收来自SMF设备的终端的下行数据通知，然后，AMF设备确定该下行数据通知，寻呼该终端。
在本申请中，AMF设备根据寻呼的寻呼原因，可以确定第一服务请求消息是由终端的被叫语音业务触发的。这里，寻呼原因是AMF设备根据SMF设备发送的寻呼策略指示符(paging policy indicator，PPI)确定的。
基于第一方面，在一些可能的实施方式中，AMF设备向接入网设备发送寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务。
在本申请中，在被叫场景下，AMF设备向终端发送寻呼原因，以告知终端此次寻呼是由于其自身的被叫语音业务。
基于第一方面，在一些可能的实施方式中，第一服务请求消息携带有第一指示，第一指示用于表示寻呼原因；那么，AMF设备根据第一服务请求消息中携带的第一指示，确定第一服务请求消息是由终端的被叫语音业务触发的。
在本申请中，通过在第一服务请求消息中携带第一指示，以告知AMF设备此次SR消息是由终端的被叫语音业务触发的，进而使得AMF设备能够对终端的被叫语音业务发起EPS fallback，使得终端的被叫语音业务不受基站的能力、无线网络部署等问题的影响，节约资源。
基于第一方面，在一些可能的实施方式中，第一服务请求消息携带有第二指示，第二指示用于表示第一服务请求消息是由终端的主叫语音业务触发的；相应的，AMF设备根据第一服务请求消息中携带的第二指示，确定第一服务请求消息是由终端的主叫语音业务触发的。
在本申请中，通过在第一服务请求消息中携带第二指示，以告知AMF设备此次SR消息是由终端的主叫语音业务触发的，进而使得AMF设备能够对终端的主叫语音业务发起EPS fallback，使得终端的主叫语音业务不受基站的能力、无线网络部署等问题的影响，节约资源。
第二方面，本申请提供一种通信方法，包括：接入网设备在与终端建立用于进行语音业务的RRC连接之后，向AMF设备发送第一服务请求消息，第一服务请求消息用于请求在5G网络进行终端的业务；接入网设备接收AMF设备发送的回落指示；接入网设备根据回落指示，将终端的语音业务由5G网络回落至4G网络。
基于第二方面，在一些可能的实施方式中，接入网设备接收AMF设备发送的回落指示，包括：接入网设备接收AMF设备发送的初始上下文设置请求消息，初始上下文请求消息中携带有回落指示。
上述方法还包括：接入网设备在建立RRC连接的过程中，接收来自终端的RRC建立完成(RRC setupcomplete)消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示用于表示第二服务请求是由终端的语音业务触发的；接入网设备向AMF设备发送第一服务请求消息，包括：接入网设备根据第二服务请求信息，向AMF设备发送第一服务请求消息。
基于第二方面，在一些可能的实施方式中，上述方法还包括：接入网设备在建立RRC连接的过程中，接收来自终端的RRC建立请求(RRC setuprequest)消息，RRC建立请求消息携带有第四指示，第四指示表示RRC建立请求消息是由终端的语音业务触发的；接入网设备向AMF设备发送第一服务请求消息，包括：接入网设备接收终端发送的RRC建立完成消息，RRC建立完成消息中携带有终端发送的第二服务请求消息；接入网设备向AMF设备发送第一服务请求消息。
基于第二方面，在一些可能的实施方式中，在接入网设备在与终端建立用于进行语音业务的RRC连接之前，上述方法还包括：接入网设备接收AMF设备发送的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；接入网设备将寻呼消息发送给终端。
基于第二方面，在一些可能的实施方式中，第三指示或第四指示是终端基于根据寻呼原因得到的。
第三方面，本申请提供一种通信方法，包括：终端接收来自接入网设备的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；终端根据寻呼原因向接入网设备发送第二服务请求消息。
基于第三方面，在一些可能的实施方式中，终端根据寻呼原因接入网设备发送第二服务请求消息，包括：终端在建立RRC连接的过程中，向接入网设备发送RRC建立完成(RRC setupcomplete)消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示是基于寻呼原因获得的。
基于第三方面，在一些可能的实施方式中，在终端根据寻呼原因接入网设备发送第二服务请求消息之前，上述方法还包括：终端在建立RRC连接的过程中，向接入网设备发送RRC建立请求消息，RRC建立请求消息携带有第四指示，第四指示是基于寻呼原因获得的。
第四方面，本申请提供一种通信装置，该通信装置可以为AMF设备中的芯片或者片上系统，还可以为AMF设备中用于实现第一方面或第一方面的任一可能的实施方式所述的方法的功能模块。举例来说，该通信装置，包括：第一接收模块，用于接收来自接入网设备的第一服务请求消息，第一服务请求消息用于请求在5G网络进行终端的业务；第一处理模块，用于确定第一服务请求消息是由终端的语音业务触发的；第一发送模块，用于向接入网设备发送回落指示，回落指示用于指示接入网设备将终端的语音业务由5G网络回落至4G网络。
基于第四方面，在一些可能的实施方式中，第一发送模块，用于将回落指示携带在初始上下文设置请求消息中，并向接入网设备发送初始上下文设置请求消息。
基于第四方面，在一些可能的实施方式中，上述装置还包括：第二接收模块，用于在第一接收模块接收来自接入网设备的第一服务请求消息之前，接收终端的下行数据通知；第一发送模块，还用于根据下行数据通知，寻呼终端。
基于第四方面，在一些可能的实施方式中，第一处理模块，具体用于根据寻呼的寻呼原因，确定第一服务请求消息是由终端的被叫语音业务触发的。
基于第四方面，在一些可能的实施方式中，第一发送模块，具体用于向接入网设备发送寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务。
基于第四方面，在一些可能的实施方式中，第一服务请求消息携带有第一指示，第一指示用于表示寻呼原因；第一处理模块，具体用于根据第一服务请求消息中携带的第一指示，确定第一服务请求消息是由终端的被叫语音业务触发的。
基于第四方面，在一些可能的实施方式中，第一服务请求消息携带有第二指示，第二指示用于表示第一服务请求消息是由终端的主叫语音业务触发的；第一处理模块，具体用于根据第一服务请求消息中携带的第二指示，确定第一服务请求消息是由终端的主叫语音业务触发的。
第五方面，本申请提供一种通信装置，该通信装置可以为接入网设备中的芯片或者片上系统，还可以为接入网设备中用于实现第二方面或第二方面的任一可能的实施方式所述的方 法的功能模块。举例来说，该通信装置，包括：第二发送模块，用于在与终端建立用于进行语音业务的RRC连接之后，向AMF设备发送第一服务请求消息，第一服务请求消息用于请求消息在5G网络进行终端的业务；第三接收模块，用于接收AMF设备发送的回落指示；第二处理模块，用于根据回落指示，将终端的语音业务由5G网络回落至4G网络。
基于第五方面，在一些可能的实施方式中，第三接收模块，具体用于接收AMF设备发送的初始上下文设置请求消息，初始上下文请求消息中携带有回落指示。
基于第五方面，在一些可能的实施方式中，上述装置还包括：第四接收模块，用于在建立RRC连接的过程中，接收来自终端的RRC建立完成消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示用于表示第二服务请求是由终端的语音业务触发的；第二发送模块，具体用于根据第二服务请求信息，向AMF设备发送第一服务请求消息。
基于第五方面，在一些可能的实施方式中，上述装置还包括：第四接收模块，用于在建立RRC连接的过程中，接收来自终端的RRC建立请求消息，RRC建立请求消息携带有第四指示，第四指示表示RRC建立请求消息是由终端的语音业务触发的；接收终端发送的RRC建立完成消息，RRC建立完成消息中携带有终端发送的第二服务请求消息；第二发送模块，用于向AMF设备发送第一服务请求消息。
基于第五方面，在一些可能的实施方式中，第三接收模块，用于在与终端建立用于进行语音业务的RRC连接之前，接收AMF设备发送的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；上述装置还包括：第三发送模块，用于将寻呼消息发送给终端。
基于第五方面，在一些可能的实施方式中，第三指示或第四指示是终端基于根据寻呼原因得到的。
第六方面，本申请提供一种通信装置，该通信装置可以为终端中的芯片或者片上系统，还可以为终端中用于实现第三方面或第三方面的任一可能的实施方式所述的方法的功能模块。举例来说，该通信装置，包括：第五接收模块，用于接收来自接入网设备的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；第四发送模块，用于根据寻呼原因接入网设备发送第二服务请求消息。
基于第六方面，在一些可能的实施方式中，第四发送模块，具体用于在建立RRC连接的过程中，向接入网设备发送RRC建立完成(RRC setupcomplete)消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示是基于寻呼原因获得的。
基于第六方面，在一些可能的实施方式中，第四发送装置，还用于在根据寻呼原因接入网设备发送第二服务请求消息之前，在建立RRC连接的过程中，向接入网设备发送RRC建立请求消息，RRC建立请求消息携带有第四指示，第四指示是基于寻呼原因获得的。
第七方面，本申请提供一种通信装置，包括：处理器和存储器；处理器与存储器耦合，处理器被配置为读取并执行存储器中的指令，以实现如上述第一方面、第二方面或第三方面的任一可能的实施方式所述的通信方法。
第八方面，本申请提供一种通信系统，包括：终端、AMF设备以及接入网设备；AMF设备，用于执行如上述第一方面或第一方面的任一可能的实施方式所述的通信方法；接入网设备， 用于执行如上述第二方面或第二方面的任一可能的实施方式所述的通信方法；终端。用于执行如上述第三方面或第三方面的任一可能的实施方式所述的通信方法。
第九方面，本申请提供一种计算机可读存储介质，计算机可读存储介质存储有指令，当指令在计算机上运行时，用于执行如上述第一方面至第十方面或其任一可能的实施方式所述的通信方法。
第十方面，本申请提供一种计算机程序或计算机程序产品，当计算机程序或计算机程序产品在计算机上被执行时，使得计算机实现如上述第一方面至第十方面或其任一可能的实施方式所述的通信方法。
应当理解的是，本申请的第四至十方面与本申请的第一至三方面的技术方案一致，各方面及对应的可行实施方式所取得的有益效果相似，不再赘述。
在以上所有方面提供的技术方案中，上述接入网设备为基站。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对本申请实施例中所需要使用的附图进行说明。
图1为本申请实施例中的通信系统的结构示意图；
图2为本申请实施例中的通信方法的流程示意图；
图3为本申请实施例中的主叫语音业务的方法流程示意图；
图4为本申请实施例中的被叫语音业务的方法流程示意图；
图5为本申请实施例中的通信装置的一种结构示意图；
图6为本申请实施例中的通信装置的另一种结构示意图；
图7为本申请实施例中的通信装置的又一种结构示意图；
图8为本申请实施例中的AMF设备/接入网设备的硬件示意图；
图9为本申请实施例中的接入网设备的一种结构示意图。
具体实施方式
下面结合本申请实施例中的附图对本申请实施例进行描述。以下描述中，如果描述一个或多个具体方法步骤，则对应的设备可以包含如功能单元等一个或多个单元，来执行所描述的一个或多个方法步骤(例如，一个单元执行一个或多个步骤，或多个单元，其中每个都执行多个步骤中的一个或多个)，即使附图中未明确描述或说明这种一个或多个单元。另一方面，例如，如果基于如功能单元等一个或多个单元描述具体装置，则对应的方法可以包含一个步骤来执行一个或多个单元的功能性(例如，一个步骤执行一个或多个单元的功能性，或多个步骤，其中每个执行多个单元中一个或多个单元的功能性)，即使附图中未明确描述或说明这种一个或多个步骤。进一步，应理解的是，除非另外明确提出，本文中所描述的各示例性实施例和/或方面的特征可以相互组合。
4G(第四代移动通信技术)网络中，用户设备(userequipment，UE)在发起语音业务时，有两种方式：长期演进语音承载(voice over long-term evolution，VoLTE)和电路域回落(circuit switched fallback，CS fallback)。其中，对于CS fallback方式，UE在发起语音业务时可以携带额外业务请求(extended service request，ESR)给核心网设备，直接 发起CSfallback。
5G(第五代移动通信技术)网络中定义了两种语音接入方式：新无线语音承载(voice over new radio，VoNR)和演进分组系统回落(evolved packet system fallback，EPS fallback)。其中，VoNR方式是指由5G接入网和核心网提供基于IP多媒体子系统(IP multiple subsystem，IMS)的语音业务，而EPS fallback方案是指UE在5G网络上发起IMS呼叫时回落到EPS(第四代移动通信技术(4G))，通过4G网络实现语音业务。
本申请实施例提供一种通信系统，在该通信系统中4G网络和5G网络可以共存，UE可以通过4G通信网络和5G通信网络进行互操作(interworking)。图1为本申请实施例中的通信系统的结构示意图，参见图1所示，该4G网络可以是长期演进(long term evolution，LTE)网络。其中，4G通信网络包括4G接入网和4G核心网(corenetwork，CN)，4G核心网可以为EPC网络，4G接入网可以包括演进型通用陆地无线接入网(evolved-universal terrestrial radio access network，E-UTRAN)。在4G网络中，UE、E-UTRAN以及EPC可以组成演进的分组系统(evolved packet system，EPS)。在上述4G核心网中，可以包括移动性管理实体(mobility management entity，MME)、服务网关(serving gateway，SGW)、分组数据网络网关(packet data network gateway，PGW)、策略和计费规则功能(policyand charging rules function，PCRF)设备以及归属签约服务器(home subscriber server，HSS)。
上述5G通信网络可以包括5G接入网(AN)和5G核心网(5GC)。其中，5G接入网可以包括下一代无线接入网(next generation radio access network，NGRAN)。5G核心网可以包括：AMF设备、用户面功能(user plane function，UPF)设备、会话管理功能(session management function，SMF)设备、策略控制功能(policy control function，PCF)设备、统一数据管理(unified data management，UDM)设备等。
其中，参见图1所示，HSS和UDM可以合一部署，用HSS+UDM表示。具体的，可以在HSS中增加UDM功能，或者在UDM中增加HSS功能，或者在另一设备同时实现HSS和UDM的功能。当然，HSS和UDM也可以分开部署，并且二者通信连接，本申请实施例不做限定。
PCRF和PCF可以合一部署，用PCRF+PCF表示。具体的，可以在PCRF中增加PCF功能，或者在PCF中增加PCRF功能，或者在另一设备同时实现PCRF和PCF的功能。当然，PCRF和PCF也可以分开部署，并且二者通信连接，本申请实施例不做限定。
SMF和PGW-C(PGW控制面功能)可以合一部署，用SMF+PGW-C表示。具体的，可以在SMF中增加PGW-C功能，或者在PGW-C中增加SMF功能，或者在另一设备同时实现SMF和PGW-C的功能。当然，SMF和PGW-C也可以分开部署，并且二者通信连接，本申请实施例不做限定。
UPF和PGW-U(PGW用户面功能)可以合一部署，用UPF+PGW-C表示。具体的，可以在UPF中增加PGW-U功能，或者在PGW-U中增加UPF功能，或者在另一设备同时实现UPF和PGW-U的功能。当然，UPF和PGW-U也可以分开部署，并且二者通信连接，本申请实施例不做限定。
上述4G网络和5G网络还可以包括其他设备，本申请实施例不做具体限定。
在上述通信系统中，UE可以通过第三代伙伴计划(3rd generation partnership project，3GPP)技术和/或非3GPP技术接入5G核心网。具体的，UE可以通过3GPP接入网设备接入5G核心网，也可以通过非3GPP接入网设备和网关设备接入5G核心网。在本申请实施例中，非3GPP接入网设备可以为无线局域网(wireless local area networks，WLAN)中的无线访问接入点(wireless access point，WAP)、全球微波接入互操作性(world interoperability  for microwave access，WiMAX)中的接入设备、码分多址(code division multiple access，CDMA)网络的交换机或路由器等。网关设备可以为非3GPP互通功能(non-3GPP interworking function，N3IWF)设备等。
在上述通信系统中，UDM设备具有统一数据管理的功能。主要负责管理签约数据、用户接入授权等功能。
PCF设备具有策略控制功能，主要负责针对会话、业务流的计费策略、QoS带宽保障及策略等相关的策略决策。该架构中，与AMF设备和SMF设备所连接的PCF分别对应AM PCF(PCF for Access and Mobility Control)和SM PCF(PCF for Session Management)，在实际部署场景中可能不是同一个PCF实体。
SMF设备具有会话管理功能，主要进行会话管理、PCF下发控制策略的执行、UPF的选择、UE的互联网协议(internet protocol，IP)地址分配等功能。
AMF设备具有接入和移动性管理功能，主要进行移动性管理、接入鉴权/授权等功能。此外，还负责在UE与PCF间传递用户策略。
UPF设备为用户面功能实体，作为和数据网络的接口，完成用户面数据转发、基于会话/流级的计费统计，带宽限制等功能。
其中各接口功能描述如下：
N7：PCF与SMF之间的接口，用于下发分组数据单元(packet data unit，PDU)会话粒度以及业务数据流粒度的控制策略。
N3：UPF+PGW-U与NG-RAN之间的通信接口。
N15：PCF与AMF之间的接口，用于下发UE策略及接入控制相关策略。
N4：SMF与UPF之间的接口，用于控制面与用户面之间传递信息，包括控制面向用户面的转发规则、QoS控制规则、流量统计规则等的下发以及用户面的信息上报。
N11：SMF与AMF之间的接口，用于传递RAN和UPF之间的PDU会话隧道信息、传递发送给UE的控制消息、传递发送给RAN的无线资源控制信息等。
N2：AMF与RAN之间的接口，用于传递核心网侧至RAN的无线承载控制信息等。
N1：AMF与UE之间的接口，接入无关，用于向UE传递QoS控制规则等。
N8：AMF与UDM间的接口，用于AMF向UDM获取接入与移动性管理相关签约数据与鉴权数据，以及AMF向UDM注册UE当前移动性管理相关信息等。
N10：SMF与UDM间的接口，用于SMF向UDM获取会话管理相关签约数据，以及SMF向UDM注册UE当前会话相关信息等。
N26：MME与AMF间的接口，用于在4G网络和5G网络互操作过程中，在源网络和目标网络之间传送移动性管理状态和会话管理状态。
S6a：MME和HSS+UDM之间的通信接口。
S11：MME和SGW之间的通信接口。
S1-MME：MME和E-UTRAN之间的通信接口。
S1-U：E-UTRAN和SGW之间的通信接口。
S5-C：SGW和SMF+PGW-C之间的控制面的通信接口。
S5-U：SGW和UPF+PGW-U之间的用户面的通信接口。
需要说明的是，本申请实施例中的UE是一种具有无线通信功能的终端设备，可以部署在 陆地上，包括室内或室外、手持、可穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。上述终端设备可以是手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端装置、增强现实(augmented reality，AR)终端装置、工业控制(industrial control)中的无线终端、无人驾驶(self-driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。终端设备也可以是具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备等。在不同的网络中终端装置可以叫做不同的名称，例如：终端装置、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、5G网络或未来演进网络中的终端设备等。
在图1所示的通信系统中，各设备的功能以及接口仅为示例性的，各个设备在应用于本申请实施例中时，并非全部功能都是必需的。核心网的全部或者部分设备可以是物理上的实体设备，也可以是虚拟化的设备，在此不做限定。当然，本申请实施例中的通信系统还可以包括未在图1中示出的其他设备，在此不做限定。
首先，需要说明的是，在本申请实施例中，“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系。例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，在本申请的描述中，“多个”是指两个或多于两个。
目前，在5G网络中，由于基站的能力、无线网络部署等问题，导致UE可能无法在5G网络中以VoNR的方式进行语音业务，那么，为了实现UE的语音业务，网络可以为UE执行EPS fallback。在EPS fallback方案中，用户设备(user equipment，UE)先注册到5G，建立IMS PDU会话(session)，并在IMS注册成功，然后UE进入空闲(idle)态。当有语音业务时，终端先尝试在5G网络为该语音业务建立相应的服务质量流(quality of service flow，QoS flow)，当5G网络的NG RAN拒绝建立QoS flow后，再执行EPS fallback。但是，上述尝试建立QoS flow的过程会额外增加不必要的时延，增加信令开销。
为了解决上述问题，本申请实施例提供一种通信方法，该通信方法可以应用于5G网络，5G网络和4G网络可以互操作。在下文中，如果没有特别说明，接入网设备是指5G网络的接入网设备，如5G网络的基站(如，gNB)。
那么，图2为本申请实施例中的通信方法的流程示意图，参见图2所示，该方法可以包括：
S201：终端(UE)与接入网设备建立用于语音业务的RRC连接；
在本申请实施例中，终端的语音业务是指由终端发起的主叫语音业务，也可以指呼叫终端的被叫语音业务。
在一些可能的实施方式中，UE可以为注册在5G网络上的UE。
S202：UE向接入网设备发送第二服务请求SR消息；
第二SR消息是由UE根据主叫语音业务或者被叫语音业务触发的。
S203：接入网设备根据第二SR消息，向AMF设备发送第一SR消息；
第一SR消息可以为接入网设备透传的第二SR消息，或者第一SR消息还可以为接入网设备响应第二SR消息生成的SR消息，本申请实施例不做具体限定。
S204：AMF设备确定第一SR消息是由UE的语音业务触发的；
由于第一SR消息是由接入网设备根据第二SR消息得到的，那么，第二SR消息是由UE根据主叫语音业务或者被叫语音业务触发的，可以理解的，第一SR消息也是由UE根据主叫语音业务或者被叫语音业务触发的。
S205：AMF设备向接入网设备发送回落指示；
S206：接入网设备根据回落指示，将UE的语音业务由5G回落至4G。
接入网设备可以发送切换请求给AMF设备，AMF设备响应该切换请求启动切换流程，将UE切换至4G网络中，使得UE可以在4G网络中进行语音业务；或者，接入网设备还可以发送重定向请求给AMF设备，AMF设备响应该重定向请求启动重定向流程，将UE重定向到4G网络中，使得UE可以在4G网络中进行语音业务。
下面结合上述通信系统，对上述通信方法进行说明。
首先，在主叫场景下，对UE的语音业务流程进行说明。
图3为本申请实施例中的主叫语音业务的方法流程示意图，参见图3所示，该方法可以包括：
S301：UE随机接入gNB(接入网设备)；
UE在开机后，会附着到5G网络中，随后，建立IMS PDU会话，并在IMS注册，UE进入空闲态。处于空闲态的UE在准备向另一个UE发起IMS语音业务之前，首先触发建立与NG RAN之间的RRC连接。UE向gNB发送随机接入前导码(random access preamble)，并在RAR时间窗(RA response window)内监听物理下行控制信道(physical downlink control channel，PDCCH)，以接收与无线网络临时标识(radio network tempory identity，RA-RNTI)对应的随机接入响应RAR。UE在接收到RAR后接入gNB。
S302：UE向gNB发送RRC建立请求(RRC setuprequest)消息；
S303：gNB向UE发送的RRC建立(RRC setup)消息；
S304：UE向gNB发送RRC建立完成(RRC setupcomplete)消息；
其中，RRC setupcomplete中可以携带第二SR消息。
在一些可能的实施方式中，为了告知AMF设备其准备发起主叫IMS语音业务，UE可以配置RRC setuprequest中的RRC建立原因(RRC establishment cause)为第四指示(如MO-VoiceCall)，并携带在S302的RRC setuprequest中，以向gNB告知UE准备发起IMS主叫语音业务。这里，第四指示用于指示RRC setuprequest是由UE的主叫语音业务触发的。
在另一些可能的实施方式中，为了告知AMF设备当前SR消息流程是由UE的主叫语音业务所触发的，也就是说第二SR消息是由UE的主叫语音业务所触发的，UE还可以将第三指示(如MO-VoiceCall)携带在S304的RRC setupcomplete中向gNB发送。这里，第三指示用于指示第二SR消息是由UE的主叫语音业务触发的。
至此，UE与gNB完成建立RRC连接，UE进入连接态(connection)。
S305：gNB向AMF设备发送第一SR消息；
其中，第一SR消息中可以携带第二指示，第二指示可以用于表示第一SR消息是由终端 的主叫业务触发的，第二指示可以为MO-VoiceCall。
gNB根据UE发送的第二SR消息确定第二SR消息是由UE的主叫语音业务所触发之后，则向AMF设备发送第一SR消息。
在一些可能的实施方式中，通过上述S301至S304，UE在与gNB建立RRC连接的过程中，向gNB发送第四指示(即MO-VoiceCall)，gNB在接收得到第四指示之后，可以将第四指示(如第二指示)直接透传给AMF设备；或者，gNB还可以根据第四指示，创建第二指示，本申请实施例对此不做具体限定。
S306：AMF设备确定第一SR消息是由UE的主叫语音业务触发的；
AMF设备在收到第一SR消息之后，根据第一SR消息中携带的第二指示，即MO-VoiceCall，可以确定当前SR消息流程是由UE的主叫语音业务触发的，进而AMF设备确定将UE的主叫语音业务由5G网络回落至4G网络，也就是对UE的主叫语音业务执行EPS fallback。
在实际应用中，对于支持5G网络的UE来说，AMF设备可以对UE的语音业务执行EPS fallback，也就是说，AMF设备可以在确定第一SR消息是由UE的主叫语音业务触发的之后，便可以指示gNB对UE的主叫语音业务执行EPS fallback，进而AMF设备执行S307。
S307：AMF设备向gNB发送回落指示；
在一些可能的实施方式中，AMF设备可以将回落指示，如EPS fallbackindicator，携带在初始上下文设置请求(initialcontextsetup request)中，并向gNB发送该initialcontextsetup request。
在本申请其他实施例中，AMF设备除了如上述对UE的主叫语音业务执行EPS fallback之外，还可以根据其他策略，如gNB的能力、运行状态、运营商策略、无线网络的部署等，确定是否对UE的主叫语音业务执行EPS fallback，若是，则执行S307，若否，AMF设备还可以向gNB发送请求消息，以请求为UE建立用于主叫语音业务的QoS Flow，进而在5G网络中完成UE的主叫语音业务。
举例来说，如果AMF设备获知UE仅支持VoNR，则AMF设备确定不对UE的主叫语音业务执行EPS fallback；或者，如果AMF设备根据本地策略获知gNB仅支持EPS fallback，则AMF设备确定对UE的主叫语音业务执行EPS fallback。如果AMF设备获知gNB处于超负荷状态，则对UE的主叫语音业务执行EPS fallback。
当然，AMF设备还可以根据其他条件判断是否对UE的主叫语音业务执行EPS fallback，在此不做具体限定。
S308：gNB根据回落指示，发起切换流程或者重定向流程；
gNB向UE发送RRC reconfiguration，修改RRC连接，使得UE切换或者重定向至EPC。
S309：UE切换或者重定向至EPS；
UE根据RRC reconfiguration，进行切换或者重定向，然后，UE向gNB发送RRC reconfigurationcomplete，以完成RRC重配置。
S310：UE在EPS发起IMS语音业务。
上述为UE发起语音呼叫的主叫语音业务流程。当UE处于空闲态时，在主叫语音业务触发EPS fallback的场景下，通过减少在5GC建立语音5QI＝1的QoS Flow的过程，从而缩短EPS fallback的呼叫建立时延，也节省了网络资源。
接下来，在被叫场景下，对UE的语音业务流程进行说明。
图4为本申请实施例中的被叫语音业务的方法流程示意图，参见图4所示，该方法可以包括：
S401：UPF设备接收来自IMS的下行报文发送请求(SIP INVITE)；
主叫UE在需要呼叫UE时，可以在5G网络或4G网络上发起呼叫，IMS域将下行报文发送请求发送给被叫UE的5GC，该请求中包括SIP INVITE消息。
S402：若UPF设备无法连接到UE，则向SMF设备发送下行数据通知(downlink data notification，DDN)消息；
在一些可能的实施方式中，如果UPF设备支持寻呼策略区分(paging policy differentiation，PPD)功能，并且如果SMF设备针对此N4会话将其激活，则UPF设备还可以在来自于下行报文互联网协议(internet protocol，IP)报头的服务类型(TOS)(IPv4)或者文本约定(TC)(IPv6)值中包括差分服务代码点(differentiated services code point，DSCP)，并将DSCP携带在DDN中发送给SMF设备。
S403：SMF设备根据DDN消息，向AMF设备通知UE的下行业务；
在一些可能的实施方式中，如果UPF设备向SMF设备发送的DDN中携带有DSCP，SMF设备可以将根据DSCP确定寻呼策略指示符(paging policy indicator，PPI)，并把PPI携带在N11消息中发送给AMF设备，使得AMF设备根据PPI获知有UE的语音业务。
可选的，SMF设备还可以在N11消息中携带UE的下行业务对应的分配保留优先级(allocation retention priority，ARP)、5QI等。那么，AMF设备还可以根据如5QI＝5获知有UE的IMS语音业务。
S404：AMF设备确定下行业务为IMS语音业务；
AMF设备根据PPI或者5QI＝5确定下行业务为IMS语音业务，那么，AMF设备就可以确定此次寻呼的寻呼原因为UE的被叫语音业务，进而可以将寻呼原因的值设置为MT-Voice。在实际应用中，AMF设备还可以通过其他方式确认UE的下行业务为IMS语音业务，本申请实施例不做具体限定。
S405：AMF设备寻呼(paging)UE，向gNB发送寻呼消息；
AMF设备向gNB发送寻呼消息，在该寻呼消息中可以携带上述寻呼原因(MT-Voice)，以告知UE此次寻呼是由于其自身的被叫语音业务。
S406：gNB将寻呼消息发送给UE；
S407：UE向gNB发送RRC setup request；
S408：gNB向UE发送RRC setup；
S409：UE向gNB发送RRC setup complete；
其中，RRC setup complete中可以携带第二SR消息。
在一些可能的实施方式中，为了告知AMF设备当前SR消息流程是由UE的被叫IMS语音业务触发的，UE可以配置RRC setup request中的RRC建立原因(RRC establishment cause)为第四指示(如MT-VoiceCall)，并携带在S407的RRC setup request中。这里，第四指示用于指示RRC setup request是由UE的被叫语音业务触发的。
在另一些可能的实施方式中，为了告知AMF设备当前SR消息流程是由UE的被叫语音业务所触发的，也就是说第二SR消息是由UE的被叫语音业务所触发的，UE还可以将第三指示(如MT-VoiceCall)携带在S409的RRC setup complete中向gNB发送。这里，第三指示用 于指示第二SR消息是由UE的被叫语音业务触发的。
需要说明的是，第三指示和第四指示在不同的语音业务场景下，可以对应不同的具体值。例如，在主叫语音业务场景下，第三指示的值和第四指示的值可以为MO-VoiceCall，而在被叫语音业务场景下，第三指示的值和第四指示的值可以为MT-VoiceCall。
至此，UE与gNB完成建立RRC连接，UE处于连接态(connection)。
S410：gNB向AMF设备发送第一SR消息；
其中，第一SR消息中可以携带第一指示(MT-VoiceCall)，第一指示用于表示本次寻呼的寻呼原因。
gNB根据UE发送的第一指示确定第二SR消息是由UE的被叫语音业务所触发之后，则向AMF设备发送第一SR消息。
在一些可能的实施方式中，通过上述S407至S409，UE在与gNB建立RRC连接的过程中，向gNB发送第三指示或第四指示(MT-VoiceCall)，gNB在接收得到第三指示或第四指示之后，可以将第三指示或第四指示直接透传给AMF设备；或者，gNB还可以根据第三指示或第四指示，创建第一指示，本申请实施例对此不做具体限定。
S411：AMF设备确定第一SR消息是由UE的被叫语音业务触发的；
AMF设备在收到第一SR消息之后，根据第一SR消息中携带的第一指示，即MT-VoiceCall，可以确定当前SR消息流程是由UE的被叫语音业务触发的，进而AMF设备确定将UE的被叫语音业务由5G网络回落至4G网络，也就是对UE的被叫语音业务执行EPS fallback。
在实际应用中，在实际应用中，对于支持5G网络的UE来说，AMF设备可以对UE的语音业务执行EPS fallback，也就是说，AMF设备可以在确定第一SR消息是由UE的被叫语音业务触发的之后，便可以指示gNB对UE的被叫语音业务执行EPS fallback，进而AMF设备执行S412。
S412：AMF设备向gNB发送回落指示；
在一些可能的实施方式中，AMF设备可以将回落指示，如EPS fallback indicator，携带在initial context setup request中，并向gNB发送该initial context setup request。
在本申请其他实施例中，AMF设备除了对UE的被叫语音业务执行EPS fallback之外，还可以根据其他策略，如gNB的能力、运行状态、运营商策略、无线网络的部署等，确定是否对UE的被叫语音业务执行EPS fallback，若是，则执行S412，若否，AMF设备还可以向gNB发送请求消息，以请求为UE建立用于被叫语音业务的QoS Flow，进而在5G网络中完成UE的被叫语音业务。
其中，AMF设备根据策略确定是否对UE的被叫语音业务执行EPS fallback的过程与上述实施例中AMF设备根据策略确定是否对UE的主叫语音业务执行EPS fallback的过程类似，在此不再赘述。
S413：gNB根据回落指示，发起切换流程或者重定向流程；
S414：UE切换或者重定向至EPC；
S415：PGW-U通过EPC向UE发送SIP INVITE；
S416：UE响应SIP INVITE在EPC上进行被叫语音业务。
上述为UE发起语音呼叫的被叫语音业务流程。当UE处于空闲态时，在被叫语音业务需要EPS fallback的场景下，通过减少在5GC建立语音5QI＝1的QoS Flow的过程，从而缩短 EPS fallback的呼叫建立时延，同时节省了网络资源。
在本申请其他实施例中，在上述S404中，AMF设备确定本次寻呼的寻呼原因为UE的被叫语音业务，之后，AMF设备可以记录本次寻呼的寻呼原因，进而在S404之后，AMF设备在执行S405时可以不在寻呼消息中携带寻呼原因。那么，在接下来的S407至S409建立RRC连接的过程中，UE可以不向gNB发送第三指示和/或第四指示，而是采用通用格式的第二SR消息发送给gNB，这样，gNB能够确定第二SR消息是由UE的业务触发的，但并不清楚是哪种业务。gNB根据第二SR消息向AMF设备发送第一SR消息，此时，第一SR消息也不携带第一指示。
相应的，S411可以包括：AMF设备根据本地记录，确定第一SR消息是由UE的被叫语音业务触发的。可以理解的，AMF设备在收到第一SR消息后，可以查询本地记录，获得UE所对应的寻呼原因，从而知道第一SR消息是由UE的被叫语音业务触发的，接下来，执行S412至S416，将UE的被叫语音业务由5G网络回落至4G网络，具体过程在此不再赘述。
在一些可能的实施方式中，在上述S404中，AMF设备记录本次寻呼的寻呼原因，并可以在执行S405时在寻呼消息中携带寻呼原因，而在接下来的S407至S409建立RRC连接的过程中，UE可以不向gNB发送第三指示和/或第四指示，而是采用通用格式的第二SR消息发送给gNB。这样，gNB能够确定第二SR消息是由UE的业务触发的，但并不清楚是哪种业务。gNB根据的第二SR消息，向AMF设备发送第一SR消息，此时，第一SR消息也不携带第一指示。相应的，S411可以包括：AMF设备根据本地记录，也就是之前记录得到寻呼原因，确定第一SR消息是由UE的被叫语音业务触发的，可以理解的，AMF设备在收到第一SR消息后，可以查询本地记录，获得UE所对应的寻呼原因，从而知道第一SR消息是由UE的被叫语音业务触发的，接下来，执行S412至S416，将UE的被叫语音业务由5G网络回落至4G网络，具体过程在此不再赘述。
由上述可知，AMF设备在在执行S404时可以记录本次寻呼的寻呼原因，那么，AMF设备在寻呼UE时，可以不用向UE告知寻呼原因，使得UE对判断执行EPS fallback这整个过程是透明的，减少对UE的影响。
基于相同的发明构思，本申请实施例还提供一种通信装置，该通信装置可以为AMF设备中的芯片或者片上系统，还可以为AMF设备中用于实施上述实施例及其任一可能的实施方式所述的方法的功能模块。举例来说，图5为本申请实施例中的通信装置的一种结构示意图，参见图5所示，该通信装置500，可以包括：第一接收模块501，用于接收来自接入网设备的第一服务请求消息，第一服务请求消息用于请求在5G网络进行终端的业务；第一处理模块502，用于确定第一服务请求消息是由终端的语音业务触发的；第一发送模块503，用于向接入网设备发送回落指示，回落指示用于指示接入网设备将终端的语音业务由5G网络回落至4G网络。
在一些可能的实施方式中，第一发送模块，用于将回落指示携带在初始上下文设置请求消息中，并向接入网设备发送初始上下文设置请求消息。
在一些可能的实施方式中，上述装置还包括：第二接收模块，用于在第一接收模块接收来自接入网设备的第一服务请求消息之前，接收终端的下行数据通知；第一发送模块，还用于根据下行数据通知，寻呼终端。
在一些可能的实施方式中，第一处理模块，具体用于根据寻呼的寻呼原因，确定第一服务请求消息是由终端的被叫语音业务触发的。
在一些可能的实施方式中，第一发送模块，具体用于向接入网设备发送寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务。
在一些可能的实施方式中，第一服务请求消息携带有第一指示，第一指示用于表示寻呼原因；第一处理模块，具体用于根据第一服务请求消息中携带的第一指示，确定第一服务请求消息是由终端的被叫语音业务触发的。
在一些可能的实施方式中，第一服务请求消息携带有第二指示，第二指示用于表示第一服务请求消息是由终端的主叫语音业务触发的；第一处理模块，具体用于根据第一服务请求消息中携带的第二指示，确定第一服务请求消息是由终端的主叫语音业务触发的。
在本申请实施例中，第一发送模块可以为发送电路、发送接口或者发送器；第一接收模块和第二接收模块可以为接收电路、接收接口或者接收器；第一处理模块可以为一个或者多个处理器。
基于相同的发明构思，本申请实施例提供一种通信装置，该通信装置可以为接入网设备中的芯片或者片上系统，还可以为接入网设备中用于实现上述实施例及其任一可能的实施方式所述的方法的功能模块。举例来说，图6为本申请实施例中的通信装置的另一种结构示意图，参见图6所示，该通信装置600，可以包括：第二发送模块601，用于在与终端建立用于进行语音业务的RRC连接之后，向AMF设备发送第一服务请求消息，第一服务请求消息用于请求消息在5G网络进行终端的业务；第三接收模块602，用于接收AMF设备发送的回落指示；第二处理模块603，用于根据回落指示，将终端的语音业务由5G网络回落至4G网络。
在一些可能的实施方式中，第三接收模块，具体用于接收AMF设备发送的初始上下文设置请求消息，初始上下文请求消息中携带有回落指示。
在一些可能的实施方式中，上述装置还包括：第四接收模块，用于在建立RRC连接的过程中，接收来自终端的RRC建立完成消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示用于表示第二服务请求是由终端的语音业务触发的；第二发送模块，具体用于根据第二服务请求信息，向AMF设备发送第一服务请求消息。
在一些可能的实施方式中，上述装置还包括：第四接收模块，用于在建立RRC连接的过程中，接收来自终端的RRC建立请求消息，RRC建立请求消息携带有第四指示，第四指示表示RRC建立请求消息是由终端的语音业务触发的；接收终端发送的RRC建立完成消息，RRC建立完成消息中携带有终端发送的第二服务请求消息；第二发送模块，用于向AMF设备发送第一服务请求消息。
在一些可能的实施方式中，第三接收模块，用于在与终端建立用于进行语音业务的RRC连接之前，接收AMF设备发送的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；上述装置还包括：第三发送模块，用于将寻呼消息发送给终端。
在一些可能的实施方式中，第三指示或第四指示是终端基于根据寻呼原因得到的。
在本申请实施例中，第二发送模块和第三发送模块可以为发送电路、发送接口或者发送器；第三接收模块和第四接收模块可以为接收电路、接收接口或者接收器；第二处理模块可以为一个或者多个处理器。
基于相同的发明构思，本申请实施例提供一种通信装置，该通信装置可以为终端中的芯片或者片上系统，还可以为终端中用于实现上述实施例及其任一可能的实施方式所述的方法的功能模块。举例来说，图7为本申请实施例中的通信装置的又一种结构示意图，参见图7所 示，该通信装置700，可以包括：第五接收模块701，用于接收来自接入网设备的寻呼消息，寻呼消息中携带有寻呼原因，寻呼原因为终端的被叫语音业务；第四发送模块702，用于根据寻呼原因接入网设备发送第二服务请求消息。
在一些可能的实施方式中，第四发送模块，具体用于在建立RRC连接的过程中，向接入网设备发送RRC建立完成(RRC setupcomplete)消息，RRC建立完成消息中携带有第二服务请求消息，第二服务请求消息携带有第三指示，第三指示是基于寻呼原因获得的。
在一些可能的实施方式中，第四发送装置，还用于在根据寻呼原因接入网设备发送第二服务请求消息之前，在建立RRC连接的过程中，向接入网设备发送RRC建立请求(RRC setuprequest)消息，RRC建立请求消息携带有第四指示，第四指示是基于寻呼原因获得的。
在本申请实施例中，第四发送模块可以为发送电路、发送接口或者发送器；第五接收模块和第二接收模块可以为接收电路、接收接口或者接收器。
基于相同的发明构思，本申请实施例还提供一种AMF设备以及接入网设备，与上述一个或者多个实施例中所述的AMF设备/接入网设备一致。图8为本申请实施例中的AMF设备和接入网设备的硬件示意图，参见图8所示，本申请实施例提供的AMF设备和接入网设备都采用了通用的计算机硬件，包括处理器801、存储器802、总线803、输入设备804以及输出设备805。
在一些可能的实施方式中，存储器802可以包括以易失性和/或非易失性存储器形式的计算机存储媒体，如只读存储器和/或随机存取存储器。存储器802可以存储操作系统、应用程序、其他程序模块、可执行代码、程序数据、用户开户数据、用户订阅数据等。
输入设备804可以用于向AMF设备/接入网设备输入命令和信息，输入设备804如键盘或指向设备，如鼠标、轨迹球、触摸板、麦克风、操纵杆、游戏垫、卫星电视天线、扫描仪或类似设备。这些输入设备可以通过总线803连接至处理器801。
输出设备805可以用于AMF设备/接入网设备输出信息，除了监视器之外，输出设备805还可以为其他外围输出设各，如扬声器和/或打印设备，这些输出设备也可以通过总线703连接到处理器801。
AMF设备/接入网设备可以通过网络接口806连接到网络中，例如连接到局域网(localarea network，LAN)。在联网环境下，AMF设备/接入网设备中存储的计算机执行指令可以存储在远程存储设备中，而不限于在本地存储。
当AMF设备中的处理器801执行存储器802中存储的可执行代码或应用程序时，AMF设备以执行以上实施例中的AMF设备一侧的方法步骤，例如执行S204、S205、S306、S307、S404、S405、S411、S412等。具体执行过程参见上述实施例，在此不再赘述。
当接入网设备中的处理器801执行存储器802中存储的可执行代码或应用程序时，接入网设备可以执行以上实施例中的接入网设备一侧的方法步骤，例如执行步骤S203、S206、S303、S305、S308、S309、S406、S408、S410、S413等。具体执行过程参见上述实施例，在此不再赘述。
此外，上述存储器802中存储有用于实现图5中的第一接收模块501、第一处理模块502和第一发送模块503的功能的计算机执行指令。图5中的第一接收模块501、第一处理模块502和第一发送模块503的功能/实现过程均可以通过图8中的处理器801调用存储器802中存储的计算机执行指令来实现，具体实现过程和功能参考上述相关实施例。
针对接入网设备的实施例，存储器802中存储有用于实现图6中第二发送模块601、第三接 收模块602以及第二处理模块603的功能的计算机执行指令。图6中第二发送模块601、第三接收模块602以及第二处理模块603的功能/实现过程可以通过图8中的处理器801调用存储器802中存储的计算机执行指令来实现，具体实现过程和功能参考上述相关实施例。
基于相同的发明构思，本申请实施例还提供一种接入网设备，图9为本申请实施例中的接入网设备的一种结构示意图，参见图9所示，该接入网设备可以为上述实施例中所述的gNB。
接入网设备可以包括收发901以及控制器/处理器902。收发器901可以用于支持接入网设备与上述实施例中的所述的UE之间收发信息，以及支持UE与其它UE之间进行无线电通信。控制器/处理器902可以用于执行各种用于与UE或其他网络设备通信的功能。在上行链路，来自UE的上行链路信号经由天线接收，由收发器901进行调解，并进一步由控制器/处理器902进行处理来恢复UE所发送到业务数据和信令信息。在下行链路上，业务数据和信令消息由控制器/处理器902进行处理，并由收发器901进行调解来产生下行链路信号，并经由天线发射给UE。控制器/处理器902还用于执行如上述实施例描述的通信方法，根据AMF设备发送的回落指示，将UE的语音业务从5G网络回落至4G网络。控制器/处理器902还可以用于执行图2至图4中涉及接入网设备的处理过程和/或用于本申请实施例所描述的技术的其他过程，譬如，在与终端建立用于进行语音业务的RRC连接之后，向AMF设备发送用于请求在5G网络进行终端的业务的第一服务请求消息，然后接收AMF设备发送的回落指示，再根据回落指示，将终端的语音业务由5G网络回落至4G网络。接入网设备还可以包括存储器903，可以用于存储接入网设备的程序代码和数据。接入网设备还可以包括通信单元904，用于支持接入网设备与其他网络实体进行通信。例如，用于支持接入网设备与AMF设备以及UE间进行通信。
可以理解的是，图9仅仅示出了接入网设备的简化设计。在实际应用中，接入网设备可以包含任意数量的发射器，接收器，处理器，控制器，存储器，通信单元等，而所有可以实现本申请实施例所述的接入网设备都在本申请实施例的保护范围之内。
基于相同的发明构思，本申请实施例提供一种计算机可读存储介质，计算机可读存储介质存储有指令，当指令在计算机上运行时，用于执行如上述实施例及其任一可能的实施方式所述通信方法。
基于相同的发明构思，本申请实施例提供一种计算机程序或计算机程序产品，当计算机程序或计算机程序产品在计算机上被执行时，使得计算机实现如上述实施例及其任一可能的实施方式所述通信方法。
本领域技术人员能够领会，结合本文公开描述的各种说明性逻辑框、模块和算法步骤所描述的功能可以硬件、软件、固件或其任何组合来实施。如果以软件来实施，那么各种说明性逻辑框、模块、和步骤描述的功能可作为一或多个指令或代码在计算机可读媒体上存储或传输，且由基于硬件的处理单元执行。计算机可读媒体可包含计算机可读存储媒体，其对应于有形媒体，例如数据存储媒体，或包括任何促进将计算机程序从一处传送到另一处的媒体(例如，根据通信协议)的通信媒体。以此方式，计算机可读媒体大体上可对应于(1)非暂时性的有形计算机可读存储媒体，或(2)通信媒体，例如信号或载波。数据存储媒体可为可由一或多个计算机或一或多个处理器存取以检索用于实施本申请中描述的技术的指令、代码和/或数据结构的任何可用媒体。计算机程序产品可包含计算机可读媒体。
作为实例而非限制，此类计算机可读存储媒体可包括RAM、ROM、EEPROM、CD-ROM或其它光盘存储装置、磁盘存储装置或其它磁性存储装置、快闪存储器或可用来存储指令或数据结 构的形式的所要程序代码并且可由计算机存取的任何其它媒体。并且，任何连接被恰当地称作计算机可读媒体。举例来说，如果使用同轴缆线、光纤缆线、双绞线、数字订户线(DSL)或例如红外线、无线电和微波等无线技术从网站、服务器或其它远程源传输指令，那么同轴缆线、光纤缆线、双绞线、DSL或例如红外线、无线电和微波等无线技术包含在媒体的定义中。但是，应理解，所述计算机可读存储媒体和数据存储媒体并不包括连接、载波、信号或其它暂时媒体，而是实际上针对于非暂时性有形存储媒体。如本文中所使用，磁盘和光盘包含压缩光盘(CD)、激光光盘、光学光盘、数字多功能光盘(DVD)和蓝光光盘，其中磁盘通常以磁性方式再现数据，而光盘利用激光以光学方式再现数据。以上各项的组合也应包含在计算机可读媒体的范围内。
可通过例如一或多个数字信号处理器(DSP)、通用微处理器、专用集成电路(ASIC)、现场可编程逻辑阵列(FPGA)或其它等效集成或离散逻辑电路等一或多个处理器来执行指令。因此，如本文中所使用的术语“处理器”可指前述结构或适合于实施本文中所描述的技术的任一其它结构中的任一者。另外，在一些方面中，本文中所描述的各种说明性逻辑框、模块、和步骤所描述的功能可以提供于经配置以用于编码和解码的专用硬件和/或软件模块内，或者并入在组合编解码器中。而且，所述技术可完全实施于一或多个电路或逻辑元件中。
本申请的技术可在各种各样的装置或设备中实施，包含无线手持机、集成电路(IC)或一组IC(例如，芯片组)。本申请中描述各种组件、模块或单元是为了强调用于执行所揭示的技术的装置的功能方面，但未必需要由不同硬件单元实现。实际上，如上文所描述，各种单元可结合合适的软件和/或固件组合在编码解码器硬件单元中，或者通过互操作硬件单元(包含如上文所描述的一或多个处理器)来提供。
在上述实施例中，对各个实施例的描述各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
以上所述，仅为本申请示例性的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。

Claims (15)

  1. 一种通信方法，其特征在于，包括：
    接入和移动性管理功能AMF设备接收来自接入网设备的第一服务请求消息，所述第一服务请求消息用于请求在5G网络进行终端的业务；
    所述AMF设备确定所述第一服务请求消息是由所述终端的语音业务触发的；
    所述AMF设备向所述接入网设备发送回落指示，所述回落指示用于指示所述接入网设备将所述终端的语音业务由5G网络回落至4G网络。
  2. 根据权利要求1所述的方法，其特征在于，所述AMF设备向所述接入网设备发送回落指示，包括：
    所述AMF设备将所述回落指示携带在初始上下文设置请求消息中，并向所述接入网设备发送所述初始上下文设置请求消息。
  3. 根据权利要求1或2所述的方法，其特征在于，在所述AMF设备接收来自接入网设备的第一服务请求消息之前，所述方法还包括：
    所述AMF设备接收所述终端的下行数据通知；
    所述AMF设备根据所述下行数据通知，寻呼所述终端。
  4. 根据权利要求3所述的方法，其特征在于，所述AMF设备确定所述第一服务请求消息是由终端的语音业务触发的，包括：
    所述AMF设备根据所述寻呼的寻呼原因，确定所述第一服务请求消息是由所述终端的被叫语音业务触发的。
  5. 根据权利要求3所述的方法，其特征在于，所述AMF设备寻呼所述终端，包括：
    所述AMF设备向所述接入网设备发送寻呼消息，所述寻呼消息中携带有寻呼原因，所述寻呼原因为所述终端的被叫语音业务。
  6. 根据权利要求5所述的方法，其特征在于，所述第一服务请求消息携带有第一指示，所述第一指示用于表示所述寻呼原因；
    所述AMF设备确定所述第一服务请求消息是由所述终端的语音业务触发的，包括：
    所述AMF设备根据所述第一服务请求消息中携带的第一指示，确定所述第一服务请求消息是由所述终端的被叫语音业务触发的。
  7. 根据权利要求1至6任一项所述的方法，其特征在于，所述第一服务请求消息携带有第二指示，所述第二指示用于表示所述第一服务请求消息是由所述终端的主叫语音业务触发的；
    所述AMF设备确定所述第一服务请求消息是由所述终端的语音业务触发的，包括：
    所述AMF设备根据所述第一服务请求消息中携带的第二指示，确定所述第一服务请求消息是由所述终端的主叫语音业务触发的。
  8. 一种通信方法，其特征在于，包括：
    接入网设备在与终端建立用于进行语音业务的无线资源控制RRC连接之后，向接入和移动性管理功能AMF设备发送第一服务请求消息，所述第一服务请求消息用于请求在5G网络进行终端的业务；
    所述接入网设备接收所述AMF设备发送的回落指示；
    所述接入网设备根据所述回落指示，将所述终端的语音业务由5G网络回落至4G网络。
  9. 根据权利要求8所述的方法，其特征在于，所述接入网设备接收所述AMF设备发送的回落指示，包括：
    所述接入网设备接收所述AMF设备发送的初始上下文设置请求消息，所述初始上下文请求消息中携带有所述回落指示。
  10. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    所述接入网设备在建立所述RRC连接的过程中，接收来自所述终端的RRC建立完成消息，所述RRC建立完成消息中携带有第二服务请求消息，所述第二服务请求消息携带有第三指示，所述第三指示用于表示所述第二服务请求是由所述终端的语音业务触发的；
    所述接入网设备向AMF设备发送第一服务请求消息，包括：
    所述接入网设备根据所述第二服务请求信息，向所述AMF设备发送所述第一服务请求消息。
  11. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    所述接入网设备在建立所述RRC连接的过程中，接收来自所述终端的RRC建立请求消息，所述RRC建立请求消息携带有第四指示，所述第四指示表示所述RRC建立请求消息是由所述终端的语音业务触发的；
    所述接入网设备向AMF设备发送第一服务请求消息，包括：
    所述接入网设备接收所述终端发送的RRC建立完成消息，所述RRC建立完成消息中携带有所述终端发送的第二服务请求消息；
    所述接入网设备根据所述第二服务请求信息向所述AMF设备发送所述第一服务请求消息。
  12. 根据权利要求10或11所述的方法，其特征在于，在所述接入网设备在与终端建立用于进行语音业务的RRC连接之前，所述方法还包括：
    所述接入网设备接收所述AMF设备发送的寻呼消息，所述寻呼消息中携带有寻呼原因，所述寻呼原因为所述终端的被叫语音业务；
    所述接入网设备将所述寻呼消息发送给所述终端。
  13. 一种接入和移动性管理功能AMF设备，其特征在于，包括：处理器和存储器；处理器与存储器耦合，处理器被配置为读取并执行存储器中的指令，以实现如权利要求1至7任一项所述的通信方法。
  14. 一种接入网设备，其特征在于，包括：处理器和存储器；处理器与存储器耦合，处理器被配置为读取并执行存储器中的指令，以实现如权利要求8至13任一项所述的通信方法。
  15. 一种通信系统，其特征在于，包括：接入和移动性管理功能AMF设备以及接入网设备；
    所述AMF设备，用于执行如权利要求1至7任一项所述的通信方法；
    所述接入网设备，用于执行如权利要求8至13任一项所述的通信方法。
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