WO2021022497A1 - 一种ims语音通信方法、无线通信装置及通信系统 - Google Patents

一种ims语音通信方法、无线通信装置及通信系统 Download PDF

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Publication number
WO2021022497A1
WO2021022497A1 PCT/CN2019/099526 CN2019099526W WO2021022497A1 WO 2021022497 A1 WO2021022497 A1 WO 2021022497A1 CN 2019099526 W CN2019099526 W CN 2019099526W WO 2021022497 A1 WO2021022497 A1 WO 2021022497A1
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WIPO (PCT)
Prior art keywords
message
mobile communication
communication network
generation mobile
access
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PCT/CN2019/099526
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English (en)
French (fr)
Inventor
姚琴波
胡文
夏苗方
闫志吉
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201980096887.XA priority Critical patent/CN113875287B/zh
Priority to PCT/CN2019/099526 priority patent/WO2021022497A1/zh
Publication of WO2021022497A1 publication Critical patent/WO2021022497A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/22—Interfaces between hierarchically similar devices between access point controllers

Definitions

  • This application relates to the field of communication technology, and in particular to an IMS voice communication method, wireless communication device and communication system.
  • an evolved packet system fallback (EPS Fallback, or Evolved Packet System Fallback) may occur, that is, falling back from the fifth-generation mobile communication network to the fourth-generation mobile communication network.
  • EPS Fallback Evolved Packet System Fallback
  • the terminal can return to the fifth-generation mobile communication network where it was before the fallback through the redirection of the access network equipment of the fourth-generation mobile communication network.
  • the current access network equipment of the fourth-generation mobile communication network does not have the above-mentioned redirection function. Only after the upgrade, the terminal that has fallen back to the fourth-generation mobile communication network can be redirected to the fifth-generation mobile communication network.
  • the upgrade requires modification of the air interface of the access network device to make the access network device support the above redirection function, but the air interface modification is not only cumbersome, but also prone to errors, resulting in system incompatibility ;
  • the upgrade will limit the communication flow, or even completely disconnect the communication service, in order to minimize the impact on the normal communication of the user, the upgrade of the access network equipment is generally carried out in the middle of the night when the communication flow is small . It can be seen that upgrading access network equipment is not only costly, but also difficult.
  • the embodiments of this application provide an Internet Protocol Multimedia Subsystem (IMS, IP Multimedia Subsystem) voice communication method, so that the terminal can autonomously return to the fifth generation of mobile after the evolved packet system fallback (EPS Fallback, or Evolved Packet System Fallback) Communications network.
  • IMS Internet Protocol Multimedia Subsystem
  • EPS Fallback evolved packet system fallback
  • Evolved Packet System Fallback Evolved Packet System Fallback
  • the method in the embodiments of the present application can be executed by a wireless communication device, which can be the complete computer of a computing device, or part of the device in the computing device, such as a chip related to wireless communication functions, such as a system Chip, communication chip or radio frequency chip.
  • the system chip is also called system-on-chip, or SoC chip.
  • the wireless communication device may be a terminal such as a smart phone, or may be a system chip or a communication chip that can be set in the terminal.
  • the communication chip may include one or more of a radio frequency processing chip and a baseband processing chip.
  • the baseband processing chip is sometimes called a modem (modem) or baseband processor.
  • the communication chip can be integrated inside the SoC chip or not integrated with the SoC chip.
  • the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip.
  • the embodiments of the present application provide an IMS voice communication method.
  • EPS evolved packet system
  • a wireless communication device After receiving an evolved packet system (EPS, Evolved Packet System) fallback indication message sent by a first access network device, a wireless communication device responds to the EPS fallback indication message, fall back from the fifth-generation mobile communication network to the fourth-generation mobile communication network, that is, switch from the first access network device of the fifth-generation mobile communication network to the second access of the fourth-generation mobile communication network Access network equipment; then after the wireless communication device is connected to the second access network device, it performs Internet Protocol Multimedia Subsystem (IMS, IP Multimedia Subsystem) voice communication through the fourth-generation mobile communication network; the wireless communication device ends the IMS After voice communication, when receiving a radio resource control connection release (RRCConnectionRelease) message, it is connected to the first access network device or the third access network device of the fifth generation mobile communication network.
  • IMS Internet Protocol Multimedia Subsystem
  • the radio resource control connection release message Does not carry redirectedCarrierInfo.
  • the above-mentioned EPS fallback indication message is a mobility message (MobilityFromNRCommand) message from a new radio command, or a radio resource control release (RRCRelease) message.
  • the third access network device is any access network device other than the second access network device under the fifth generation mobile communication network.
  • the termination of the IMS voice communication by the wireless communication device means that the wireless communication device sends a goodbye BYE message under the IMS calling service and receives a good 200 (OK) message, or the wireless communication device is in Under the IMS called service, a goodbye BYE message is received, and a 200 (OK) message sent in response to the goodbye BYE message.
  • the goodbye BYE message and the good 200 (OK) message are messages in the Session Initiation Protocol (SIP, Session Initiation Protocol).
  • SIP Session Initiation Protocol
  • the goodbye BYE message is used to indicate the end of the IMS voice communication
  • the good 200 (OK) The message is used in response to the goodbye BYE message.
  • the wireless communication device can autonomously recognize whether the current scene is a scene that requires autonomous return after falling back, and initiate autonomous return in a scenario that requires autonomous return, but in a scenario that does not require autonomous return The following will reduce invalid voluntary return attempts. Therefore, through the method of the embodiment of the present application, the wireless communication device can avoid staying in the fourth-generation mobile communication network without upgrading the access network equipment supporting the fourth-generation mobile communication network, and return to the fifth-generation mobile communication independently. Get a better communication experience.
  • the wireless communication device After the wireless communication device terminates the IMS voice communication, it receives a radio resource control connection release message that does not carry redirection carrier information, and does not receive the evolved packet system EPS fallback indication message.
  • QoS Flow Quality of Service Flow
  • the wireless communication device can more accurately identify whether the current scene is a scene that requires autonomous return by further determining whether the fallback is caused by the fifth-generation mobile communication network not supporting IMS voice communication.
  • the wireless communication device After the wireless communication device ends the IMS voice communication, it receives a radio resource control connection release message that does not carry redirection carrier information, and before receiving the evolved packet system EPS fallback indication message When the measurement report is not reported within the preset time period, access to the fifth generation mobile communication network.
  • the preset duration is a specific duration set in advance
  • the measurement report here may be a common measurement report, or may refer to a measurement report including a specific handover event.
  • the aforementioned measurement report may reflect the communication quality of the wireless communication device.
  • the above-mentioned specific switching event includes one or two of the B1 event and the B2 event.
  • the B1 event is used to indicate that the quality of the cell of the different system is better than the threshold
  • the B2 event is used to indicate that the quality of the serving cell where the wireless communication device is located is lower than the threshold 1, and the quality of the cell of the different system is better than the threshold 2.
  • the wireless communication device can quickly determine whether the EPS fall is not caused by the poor communication quality of the wireless communication device in the fifth-generation mobile communication network, so as to more accurately identify whether the current scene is a scene that requires autonomous return.
  • a wireless communication device may be a terminal device or a device for terminal equipment.
  • the terminal device can be a mobile phone, a wearable device, or a tablet computer.
  • the device used for the terminal device may be a chip in the terminal device.
  • the wireless communication device can perform the method described in any one of the first aspect and the implementable manners of the first aspect.
  • the function of the wireless communication device can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the unit can be software and/or hardware.
  • the wireless communication device includes:
  • the receiving unit is used to receive the EPS fallback indication message of the evolved packet system; the processing unit is used to switch from the first access network device supporting the fifth generation mobile communication network to the second access network device supporting the fourth generation mobile communication network , Perform Internet Protocol Multimedia Subsystem IMS voice communication; the receiving unit is also used to receive a radio resource control connection release message (RRCConnectionRelease), the radio resource control connection release message does not carry redirection indication information (redirectedCarrierInfo); the processing unit, It is used to connect to the fifth-generation mobile communication network when the radio resource control connection release message is received after completing the IMS voice communication.
  • RRCConnectionRelease radio resource control connection release message
  • redirection indication information redirection indication information
  • the above-mentioned EPS fallback indication message is a mobility message (MobilityFromNRCommand) message from a new radio command, or a radio resource control release (RRCRelease) message.
  • the third access network device is any access network device other than the second access network device under the fifth generation mobile communication network.
  • the above processing unit is specifically configured to: after sending a goodbye BYE message and receiving a good OK message, or, after receiving a goodbye BYE message and sending a good OK message, after receiving the wireless
  • the resource control connection release message it is connected to the above-mentioned fifth-generation mobile communication network; wherein, the above-mentioned goodbye BYE message and the above-mentioned OK message are messages in the session initiation protocol, and the above-mentioned goodbye BYE message is used to indicate the end of the IMS voice communication,
  • the OK message is used in response to the above-mentioned Goodbye BYE message.
  • the aforementioned processing unit is specifically configured to: after terminating IMS voice communication, after receiving a radio resource control connection release message that does not carry redirection carrier information, and after receiving the aforementioned evolved packet system EPS When there is no quality of service flow of the IMS voice before the indication message, access to the fifth generation mobile communication network.
  • the aforementioned processing unit is specifically configured to: after terminating IMS voice communication, after receiving a radio resource control connection release message that does not carry redirection carrier information, and after receiving the aforementioned evolved packet system EPS
  • the measurement report may be a general measurement report, or it may specifically refer to a measurement report including the B1 event, or the B2 event, or the B1 event and the B2 event.
  • a wireless communication device may be a terminal device or a device for terminal equipment.
  • the terminal device can be a mobile phone, a wearable device, or a tablet computer.
  • the device used for the terminal device may be a chip in the terminal device.
  • the wireless communication device includes a processor and a transceiver. Among them, the processor is connected to the transceiver.
  • the wireless communication device further includes a memory. The processor is connected to the memory.
  • the transceiver when the wireless communication device is a terminal device, the transceiver may include an antenna and a radio frequency circuit connected to the antenna.
  • the transceiver is used to implement communication between the wireless communication device and other network elements.
  • the transceiver is used to implement communication between a wireless communication device and a network device.
  • the transceiver when the wireless communication device is a device for terminal equipment, the transceiver may be an interface circuit, and the interface circuit is used by the processor to obtain or output information or data.
  • the interface circuit is used for the processor to read data from the memory or write data.
  • the interface circuit is used for the processor to receive information or data from outside the device or send information or data to the outside of the device.
  • the processor is configured to execute the method of any one of the foregoing first aspect and the implementable manner of the first aspect.
  • the memory is used to store a program
  • the processor calls the program stored in the memory to execute the method of any one of the foregoing first aspect and the implementable manner of the first aspect.
  • the operations and beneficial effects performed by the processor reference may be made to the method and beneficial effects described in any one of the foregoing first aspect and the implementation manners of the first aspect, and repetitions are not repeated here.
  • a communication system in the fourth aspect, includes a wireless communication device and a first access network device, wherein: the above-mentioned first access network device is used to send an evolved packet system EPS fallback indication message to the above-mentioned wireless communication device; the above-mentioned wireless communication device is used to receive the above The evolved packet system EPS fallback indication message sent by the first access network device is then switched from the first access network device supporting the fifth-generation mobile communication network to the second access network device supporting the fourth-generation mobile communication network.
  • the above-mentioned wireless communication device is also used to access the above-mentioned fifth-generation mobile communication network when receiving a radio resource control connection release message (RRCConnectionRelease) after terminating the above-mentioned IMS voice communication, wherein the above-mentioned radio resource control
  • the connection release message does not carry redirected carrier information (redirectedCarrierInfo).
  • the above-mentioned EPS fallback indication message is a mobility message (MobilityFromNRCommand) message from a new radio command, or a radio resource control release (RRCRelease) message.
  • the third access network device is any access network device other than the second access network device under the fifth generation mobile communication network.
  • the above-mentioned wireless communication device terminating IMS voice communication refers to after sending a goodbye BYE message and receiving a good OK message, or after receiving a goodbye BYE message and sending a good OK message,
  • the goodbye BYE message and the OK message are messages in the session initiation protocol
  • the goodbye BYE message is used to indicate the end of the IMS voice communication
  • the OK message is used to respond to the goodbye BYE message.
  • the above-mentioned wireless communication device is specifically configured to terminate IMS voice communication, after receiving a radio resource control connection release message that does not carry redirection carrier information, and after receiving the above-mentioned evolved packet system EPS When there is no quality of service flow of the IMS voice before the indication message, access to the fifth generation mobile communication network.
  • the above-mentioned wireless communication device is specifically configured to terminate IMS voice communication, after receiving a radio resource control connection release message that does not carry redirection carrier information, and after receiving the above-mentioned evolved packet system EPS
  • the measurement report may be a general measurement report, or it may specifically refer to a measurement report including the B1 event, or the B2 event, or the B1 event and the B2 event.
  • a computer program product which when running on a computer, causes the computer to execute the above-mentioned first aspect or the method in the possible implementation of the first aspect.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, which when run on a computer, cause the computer to execute the first aspect or the implementation of the first aspect method.
  • FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of an IMS voice communication method provided by an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of another IMS voice communication method provided by an embodiment of the present application.
  • Fig. 4 is a schematic flowchart of an IMS voice communication method provided by an embodiment of the present application.
  • FIG. 5 is a schematic block diagram of a wireless communication device provided by an embodiment of the present application.
  • Fig. 6 is a structural block diagram of a wireless communication device provided by an embodiment of the present application.
  • the embodiments of the present application provide an IMS voice communication method, wireless communication device, and communication system.
  • the IMS voice communication method can be executed by a wireless communication device.
  • the wireless communication device may be a terminal or a device for terminal equipment.
  • the device used for the terminal device may be a chip in the terminal device or the like.
  • the IMS voice communication method will be described with the terminal as the executive body.
  • the terminal can automatically identify and trigger scenarios that need to return autonomously after falling back from the fifth generation (5G, 5th generation) mobile communication network to the fourth generation (4G, 4th generation) mobile communication network Return to the 5G mobile communication network without requiring the access network equipment of the 4G mobile communication network to instruct the terminal to redirect to the 5G mobile communication network.
  • the communication system includes a terminal, a first access network device, and a second access network device.
  • the first access network device is a next generation Node B (gNodeB or gNB, next generation Node B); the second access network device is an evolved Node B (eNodeB or eNB, evolved Node B).
  • the communication system may also include other access network equipment (such as third access network equipment) and terminals, the third access network equipment is also gNB, and the first access network equipment and the second access network equipment
  • the device and the third access network device are different devices, and will not be repeated here.
  • the terminal may also be called a user equipment (UE), a mobile station (MS) or a subscriber unit (SU).
  • the terminal can be, but is not limited to, mobile phones, tablet computers, laptop computers, wearable devices (smart watches, smart bracelets, smart helmets, smart glasses, etc.), and other devices with wireless access.
  • Incoming communication devices such as various Internet of Things devices, including smart home devices (smart meters, smart home appliances, etc.), smart vehicles, etc.
  • the access network device can provide communication coverage for a specific geographic area, and can communicate with terminals located in the aforementioned coverage area.
  • the access network device can support communication protocols of different standards, or can support different communication modes.
  • the terminal can access the corresponding mobile communication network through the access network device.
  • the first access network device supports the 5G mobile communication network and the second access network device supports the 4G mobile communication network.
  • the communication effect and service experience obtained from 5G mobile communication network will be better than 4G mobile communication network, but in a few cases such as unstable communication environment, the communication effect of 4G mobile communication network may actually be better than 5G mobile communication The internet.
  • IMS voice communication includes ordinary voice call (voice call) services, emergency call (emergency call) services, and video call (video call) services.
  • the terminal may switch from the first access network device under the 5G mobile communication network to the second access network device under the 4G mobile communication network while maintaining the connection state with the first access network device supporting the 5G mobile communication network.
  • Access network equipment resulting in an Evolved Packet System Fallback (EPS Fallback, or Evolved Packet System Fallback) from the 5G mobile communication network to the 4G mobile communication network. Since the communication effect of the 5G mobile communication network is better than that of the 4G mobile communication network in most cases, even if there is a fall, the terminal hopes to return to the 5G mobile communication network as soon as possible to obtain higher-quality communication services.
  • EPS Fallback Evolved Packet System Fallback
  • the access network device redirection method can be used to instruct the terminal to return to the 5G mobile communication network where it was before the fall. But the reality is that the access network equipment under the 4G mobile communication network needs to be upgraded before the terminal can be redirected to the 5G mobile communication network.
  • this application provides an IMS voice communication method, which can realize the autonomous return of the terminal without the need to return under the instruction of the access network device under the 4G mobile communication network.
  • the terminal receives the Evolved Packet System (EPS, Evolved Packet System) fallback indication message sent by the first access network device of the 5G mobile communication network. Then the terminal falls back from the 5G mobile communication network to the 4G mobile communication network according to the EPS fallback instruction message, that is, switches from the first access network device under the 5G mobile communication network to the second access network device under the 4G mobile communication network. After the terminal falls back successfully, IMS voice communication is carried out through the 4G mobile communication network. Finally, when the terminal completes the IMS voice communication and receives a radio resource control connection release message that does not carry the redirection carrier information, it accesses the 5G mobile communication network.
  • EPS Evolved Packet System
  • the first access device when the first access device and the terminal are in a connected state, the first access device sends an EPS fallback indication message to the terminal to instruct the terminal to switch from the first access device under the 5G mobile communication network to 4G mobile communication
  • the second access device under the network The fallback indication message may be a mobility (MobilityFromNRCommand) message from a new radio command recorded in the 3rd generation partnership project (3GPP, 3rd generation partnership project) technical specification, or may be a radio resource control release (RRCRelease) message.
  • 3GPP 3rd generation partnership project
  • 3rd generation partnership project 3rd generation partnership project
  • RRCRelease radio resource control release
  • the terminal After receiving the fallback instruction message, the terminal connects to the second access device according to the fallback instruction message to fall back to 4G to perform IMS voice communication. Since the terminal performs IMS voice communication after falling back, it can be determined that the fall is caused by the 5G mobile communication network not supporting IMS voice communication, rather than the poor communication quality of the terminal on the 5G mobile communication network. Therefore, after completing the IMS voice communication, if the current scene is identified as a scene that needs to be returned autonomously, that is, when a radio resource control connection release (RRCConnectionRelease) message that does not carry the redirectedCarrierInfo field is received, it will be autonomous Access to 5G mobile communication network.
  • RRCConnectionRelease radio resource control connection release
  • the terminal of this application returns to the 5G mobile communication network autonomously and does not need to access the 5G mobile communication network according to the instructions of the access network equipment. It is understandable that there are many types of radio resource control connection release messages issued by the network side. The terminal can be based on whether the received radio resource control connection release message includes the redirection carrier information field, and the redirection carrier information field The carried information determines which standard or frequency cell the terminal will redirect to after receiving the radio resource control connection release message.
  • the wireless communication network when the radio resource control connection release message received by the wireless communication network does not carry redirection carrier information , the wireless communication network enters the idle (IDLE) state according to the 3GPP technical specifications, and then autonomously initiates the network access process to access the 5G mobile communication network; the wireless resource control connection release message received on the wireless communication network carries the redirection carrier information At this time, the wireless communication network accesses the mobile communication network pointed to by the redirected carrier information carried in the wireless resource control connection release message according to the wireless resource control connection release message.
  • IDLE idle
  • the wireless resource control connection release message received on the wireless communication network carries the redirection carrier information
  • the wireless communication network accesses the mobile communication network pointed to by the redirected carrier information carried in the wireless resource control connection release message according to the wireless resource control connection release message.
  • the terminal accesses the 5G mobile communication network according to the radio resource control connection release message ;
  • the information carried in the redirection carrier information field of the radio resource control connection release message is Global Mobile Communication Radio Access Network carrier frequency information (CarrierFreqGERAN)
  • the terminal accesses to the global mobile communication according to the radio resource control connection release message (GSM, Global System for Mobile Communications) system;
  • the information carried in the redirection carrier information field of the radio resource control connection release message is the absolute radio channel number value information (ARFCN-ValueUTRA) of the universal land surface radio access network
  • the terminal accesses the Universal Terrestrial Radio Access (UTRA, Universal Terrestrial Radio Access) network according to the radio resource control connection release message;
  • the information carried in the redirection carrier information field of the radio resource control connection release message is code division multiple When accessing the network carrier frequency information (CarrierFreqCDMA2000), the terminal
  • FIG. 2 is a schematic flowchart of an IMS voice communication method provided by an embodiment of the present application
  • FIG. 3 is a schematic flowchart of another IMS voice communication method provided by an embodiment of the present application.
  • the terminal initiates a calling service.
  • the IMS voice communication process mainly uses the Session Initiation Protocol (SIP, Session Initiation Protocol) to establish, modify, and terminate the IMS voice communication session.
  • SIP Session Initiation Protocol
  • IMS voice communication methods mainly include:
  • the terminal sends a request (INVITE) message to an access network device, where the request message is used to request to establish a session with a called user.
  • a request INVITE
  • the terminal receives a Trying 100 (Trying) message sent by the access network device, where the Trying 100 (Trying) message is used to indicate that the request message has been received.
  • the terminal receives a Ringing 180 (Ringing) message sent by the access network device, where the Ringing 180 (Ringing) message is used to instruct the terminal to ring.
  • Ringing 180 (Ringing) message sent by the access network device, where the Ringing 180 (Ringing) message is used to instruct the terminal to ring.
  • the terminal receives a good 200 (OK) message sent by the access network device, where the good 200 (OK) message is used to instruct the called user to answer the session.
  • a good 200 (OK) message sent by the access network device, where the good 200 (OK) message is used to instruct the called user to answer the session.
  • the terminal sends an acknowledgement (ACK) message to the access network device, where the acknowledgement (ACK) message is used to have received a final response to the request message.
  • ACK acknowledgement
  • the terminal receives a goodbye (BYE) message sent by the access network device, where the goodbye (BYE) message is used to instruct to end the session.
  • a goodbye (BYE) message sent by the access network device, where the goodbye (BYE) message is used to instruct to end the session.
  • the terminal sends a good 200 (OK) message to the access network device, and the good 200 (OK) message is used to respond to the goodbye (BYE) message.
  • the IMS voice communication method mainly includes parts 301 to 307, where parts 301 to 305 are the same as parts 201 to 205, and details are not repeated here.
  • the terminal sends a goodbye (BYE) message to the access network device, where the goodbye (BYE) message is used to instruct to end the session.
  • a goodbye (BYE) message is used to instruct to end the session.
  • the terminal receives a good 200 (OK) message sent by the access network device, and the good 200 (OK) message is used to respond to the goodbye (BYE) message.
  • FIG. 4 is a schematic flowchart of another IMS voice communication method provided by an embodiment of the present application.
  • the IMS voice communication method includes parts 401 to 403, of which:
  • the first access network device sends an evolved packet system EPS fallback indication message to the terminal.
  • the first access network device sends an EPS fallback indication message to the terminal.
  • the EPS fallback instruction message is used to instruct the terminal to switch from the first access network device of the 5G mobile communication network to the first access network device of the 4G mobile communication network.
  • the EPS fallback indication message is used to indicate that the terminal is performing the fallback process. Before receiving the EPS fallback instruction message, the terminal cannot accurately know from the air interface whether a fallback has occurred.
  • the above-mentioned EPS fallback indication message may be a mobility message (MobilityFromNRCommand) message from a new radio command specified in the 3gpp technical specification, or may be a radio resource control release (RRCRelease) message.
  • MobilityFromNRCommand mobility message
  • RRCRelease radio resource control release
  • the first access network device initiates IMS voice communication to the terminal, or the terminal initiates IMS voice communication to the first access network device , This application does not limit this.
  • the process in which the terminal initiates IMS voice communication to the first access network device is called the original call (MO, Mobile Original call), and the process in which the first access network device initiates IMS voice communication to the terminal is called the called (MT, Mobile terminal). call).
  • the terminal After receiving the evolved packet system EPS fallback indication message sent by the first access network device, the terminal connects from the first access network device supporting the fifth generation mobile communication network to the second access network device supporting the fourth generation mobile communication network.
  • the terminal after receiving the EPS fallback indication message sent by the first access network device supporting the 5G mobile communication network, the terminal accesses the second access network supporting the 4G mobile communication network according to the EPS fallback indication message
  • the equipment can fall back to the 4G mobile communication network and carry out IMS voice communication through the 4G mobile communication network.
  • IMS voice communication via 4G mobile communication network means that the second access network device allocates wireless resources for IMS voice communication and establishes service data for transmitting IMS voice communication between the terminal and the access network device.
  • QoS Flow Quality of Service Flow
  • the terminal After terminating the IMS voice communication of the Internet Protocol Multimedia Subsystem, the terminal accesses the fifth-generation mobile communication network when receiving the radio resource control connection release message, where the radio resource control connection release message does not carry redirection carrier information.
  • the terminal falls back because the 5G mobile communication network does not support IMS voice communication, and the terminal needs to return to the 5G mobile communication network after completing the IMS voice communication, in order to obtain higher-quality communication services as much as possible.
  • the terminal independently accesses the 5G mobile communication network when it receives the radio resource control connection release message that does not carry the redirection carrier information sent by the second access network device.
  • the terminal can access any access network device under the 5G mobile communication network, including but not limited to the first access network device.
  • the terminal may reconnect to the first access network device supporting the fifth generation mobile communication network, or search for and access the third access network device supporting the fifth generation mobile communication network.
  • the process of the terminal autonomously accessing the 5G mobile communication network can be a traditional terminal access process, for example, it mainly includes three stages: the first stage, cell search and cell selection; the second stage, random access; and the third stage , Registration (REGISTRATION).
  • the terminal after the terminal sends a goodbye BYE message and receives a good 200 (OK) message, or after receiving a goodbye BYE message and sends a good 200 (OK) message, it marks IMS voice communication end.
  • the BYE message and the good 200 (OK) message are messages in the session initiation protocol
  • the BYE message is used to indicate the end of the IMS voice communication
  • the good 200 (OK) message is used to respond to the goodbye BYE message.
  • the terminal After the terminal completes the IMS voice communication, if it receives a radio resource control connection release message that does not carry the redirection carrier information, it is equivalent to recognizing that the current scene is a scene that requires autonomous return. On the contrary, it is recognized that the current scene is not a scene that requires autonomous return, so no invalid autonomous return attempt is made.
  • the terminal can determine whether IMS voice communication is currently being performed.
  • the terminal initiates IMS voice communication to the access network device, or the access network device initiates the IMS voice communication to the terminal, the terminal sends or receives an invitation (Invite) signaling for initiating IMS voice communication. Therefore, if the terminal detects that the terminal has sent or received an invite (Invite) signaling, it can determine that the terminal is in IMS voice communication.
  • the reason why the terminal needs to return to 5G after completing the IMS voice communication is because the terminal will receive the REGISTRATION ACCEPT message sent by the first access network device under 5G before falling back.
  • the message indicates that the 5G mobile communication network does not support IMS voice communication. Therefore, when the terminal performs IMS voice communication after the fallback, it can be determined that the fallback is caused by the 5G mobile communication network not supporting IMS voice communication. Therefore, it is necessary to return to the 5G mobile communication network after completing the IMS voice communication.
  • the Internet Protocol Multimedia Subsystem Voice over Packet Service (IMS-VoPS) field in the registration received message records whether the 5G mobile communication network supports the currently connected IMS voice communication content, if the value under the IMS-VoPS field is 00 , It means that the 5G mobile communication network does not support the currently connected IMS voice communication.
  • IMS-VoPS Internet Protocol Multimedia Subsystem Voice over Packet Service
  • the first case after the terminal ends the IMS voice communication, when it receives a radio resource control connection release message that does not carry the redirection carrier information, it accesses the above-mentioned fifth generation mobile communication network.
  • the terminal after the terminal completes the IMS voice communication, if it receives a radio resource control connection release message that does not carry the redirection carrier information, it will autonomously access the 5G mobile communication network. Because the radio resource control connection release message issued by the second access network device does not carry redirection carrier information, it means that the second access network device does not support redirection of the terminal to the 5G mobile communication network. Therefore, when the terminal completes IMS voice communication and determines that the second access network device under the 4G mobile communication network does not support redirecting the terminal to the 5G mobile communication network, it autonomously initiates the network access process to access the 5G mobile communication network to connect Enter the 5G mobile communication network.
  • Case 2 After the terminal ends IMS voice communication, it receives a radio resource control connection release message that does not carry redirection carrier information, and there is no IMS voice quality of service flow before receiving the above-mentioned evolved packet system EPS fallback indication message , Access to the fifth-generation mobile communication network.
  • the embodiment of the application can further determine whether the fallback is caused by the 5G mobile communication network not supporting IMS voice communication. specific. If the terminal does not detect the QoS flow of IMS voice communication before receiving the EPS fallback indication message, it can indicate that the IMS voice flow is initiated between the terminal and the first access network device under 5G, but the IMS voice communication service is not established. Quality flow (QoS Flow, Quality of Service Flow), so that the fallback of the terminal can be determined more accurately because the 5G mobile communication network does not support IMS voice communication.
  • QoS Flow Quality of Service Flow
  • the terminal after the terminal ends the IMS voice communication, when it receives a radio resource control connection release message that does not carry the redirection carrier information, and there is no IMS voice quality of service flow before receiving the EPS fallback indication message, it accesses the fifth Generation mobile communication network.
  • a QoS Flow will be established between the terminal and the access network device to transmit IMS voice communication data.
  • the QoS Flow includes not only the service data of IMS voice communication (such as user's voice data and video data), but also the QoS identifier (5QI) of the QoS Flow.
  • the terminal determines whether the QoS Flow established between the terminal and the access network device is the QoS Flow of IMS voice communication by reading the 5QI of the QoS Flow. Specifically, the terminal detects whether the 5QI of the QoS Flow established between the terminal and the access network device is 1 or 2, and if so, determines that the QoS Flow of the IMS voice communication is detected.
  • the 5QI of the QoS Flow is 1, it is determined that the QoS Flow of IMS voice communication is the QoS Flow of the voice service (Conversational Voice); if the 5QI of the QoS Flow is 2, it is determined that the QoS Flow of the IMS voice communication is the video service (Conversational). Video) QoS Flow.
  • the third case After the terminal ends the IMS voice communication, it receives a radio resource control connection release message without the redirection carrier information, and does not report a measurement report within the preset time period before receiving the above-mentioned evolved packet system EPS fallback indication message At the time, access to the fifth-generation mobile communication network.
  • the measurement report is a measurement report containing any event, and the preset duration can be any duration, which is not limited in this application.
  • the embodiment of this application can also determine whether the terminal has not reported a measurement report within a preset period of time before receiving the EPS fallback indication message to further determine whether the fallback is This is caused by the poor communication quality of the terminal in the 5G mobile communication network. If the terminal does not report the measurement report within the preset period of time before receiving the EPS fallback indication message, it is determined that the fallback is not caused by the poor communication quality of the terminal in the 5G mobile communication network; if the terminal fails before receiving the EPS fallback indication message If the measurement report is reported within the preset time period, the drop may be caused by the poor communication quality of the terminal in the 5G mobile communication network.
  • the terminal needs to return to the 5G mobile communication network after completing the IMS voice communication to obtain higher-quality communication services as much as possible. Therefore, after the terminal ends the IMS voice communication, it receives the radio resource control connection release message that does not carry the redirection carrier information, and does not report the measurement report within the preset period of time before receiving the EPS fallback indication message, it accesses the fifth Generation mobile communication network.
  • the measurement report contains events for indicating communication quality.
  • the access network device executes, for example, instructing the terminal to switch connections to other accesses based on the events in the measurement report. Network equipment and other operations to improve the communication quality of the terminal. Therefore, when the terminal does not report the measurement report, the communication quality of the mobile communication network where the terminal is currently located can be considered to be relatively good. Therefore, if the terminal does not report the measurement report within the preset time period before receiving the EPS fallback indication message, it can be determined that the terminal fallback is not caused by poor communication quality in the 5G mobile communication network.
  • the fourth case After the terminal ends the IMS voice communication, it receives a radio resource control connection release message that does not carry the redirection carrier information, and does not report a measurement report within the preset time period before receiving the above-mentioned evolved packet system EPS fallback indication message At the time, access to the fifth-generation mobile communication network.
  • the measurement report is a measurement report that includes the B1 event, or the B2 event, or the B1 event and the B2 event.
  • the preset duration can be any duration, which is not limited in this application.
  • the embodiment of this application can also determine that the measurement including a specific handover event is not reported within a preset period of time before receiving the evolved packet system EPS fallback indication message. Report to determine that the fallback was not caused by the poor communication quality of the terminal in the 5G mobile communication network. If it is because the 5G mobile communication network does not support IMS voice communication, and not because of poor communication quality, it is necessary to return to the 5G mobile communication network after completing the IMS voice communication to provide the terminal with higher-quality communication services as much as possible.
  • the terminal After the terminal ends the IMS voice communication, it receives a radio resource control connection release message that does not carry redirection carrier information, and does not report any specific handover event within the preset period of time before receiving the above-mentioned evolved packet system EPS fallback indication message.
  • the measurement report In the measurement report, it is connected to the fifth generation mobile communication network.
  • the specific switching event includes at least one of the B1 event and the B2 event.
  • the measurement report contains events for indicating communication quality, for example, there are Type A events and Type B events.
  • Type A events are used to indicate the communication quality of cells in the same system.
  • Type B events indicate communication quality between different systems. The communication quality of the cell. Since the 5G mobile communication network falls back to the 4G mobile communication network as a handover event of a different system, this application only focuses on Type B events in the measurement report.
  • Type B events include B1 events and B2 events. The meaning of B1 events is for cells of different systems.
  • the quality is better than the threshold, and the meaning of the B2 event is that the quality of the serving cell is lower than the threshold 1, and the quality of the cell of the different system is better than the threshold 2. Therefore, if the terminal does not report a measurement report containing at least one of the B1 event and the B2 event within the preset time period before receiving the EPS fallback indication message, it can be determined that the terminal fallback is not due to the 5G mobile communication network. Caused by poor communication quality.
  • the fallback needs to be determined because the 5G mobile communication network does not support IMS voice communication.
  • the third and fourth cases it is not only necessary to determine that the fallback is due to the 5G mobile communication network. If the IMS voice communication is not supported, it is also necessary to determine that the fallback is not caused by the poor communication quality of the terminal in the 5G mobile communication network.
  • the terminal After the terminal ends IMS voice communication, it receives a radio resource control connection release message, and there is no IMS before receiving the EPS fallback indication message.
  • the voice quality of service flow is received and the measurement report is not reported within the preset time period before receiving the evolved packet system EPS fallback indication message, it is connected to the fifth-generation mobile communication network; for example, the terminal receives the IMS voice communication after it ends Radio resource control connection release message, there is no IMS voice quality of service flow before the EPS fallback indication message is received, and no measurement containing a specific handover event is reported within the preset time period before the EPS fallback indication message is received At the time of the report, access to the fifth-generation mobile communication network.
  • the terminal autonomously returns to the 5G mobile communication network without an instruction from the second access network device of the 4G mobile communication network. Therefore, with the method of this application, the terminal can autonomously identify whether the current scene is a scene that needs to return autonomously after falling back. And initiate autonomous return in time in scenarios where autonomous return is required, so as to obtain high-quality communication services as much as possible. In scenarios where autonomous return is not required, invalid autonomous return attempts are reduced, because invalid autonomous return attempts will seriously affect the normal communication of the terminal. Therefore, the method of this embodiment does not need to upgrade the access network equipment under the 4G mobile communication network, and can realize an efficient communication process and improve communication efficiency.
  • FIG. 1 and FIG. 4 are examples, and does not constitute a limitation to the embodiment of this application, because this application does not impose any restrictions on the terminal, the first access network device, and the second access network device. The specific manifestation is limited.
  • the embodiment of the present invention may divide the device into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiment of the present invention is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • the implementation of the present invention also provides a wireless communication device.
  • the wireless communication device includes a receiving unit 510 and a processing unit 520, specifically:
  • the receiving unit 510 is configured to receive an evolved packet system EPS fallback indication message
  • the processing unit 520 is configured to switch from the first access network device supporting the fifth-generation mobile communication network to the second access network device supporting the fourth-generation mobile communication network to perform Internet Protocol Multimedia Subsystem IMS voice communication;
  • the receiving unit 510 is further configured to receive a radio resource control connection release message, and the radio resource control connection release message does not carry redirection indication information;
  • the above-mentioned processing unit 520 is configured to access the above-mentioned fifth-generation mobile communication network when receiving a radio resource control connection release message after completing the above-mentioned IMS voice communication.
  • the aforementioned processing unit 520 is specifically configured to: after sending a goodbye BYE message and receiving a good 200 (OK) message, or after receiving a goodbye BYE message and sending a good 200 (OK)
  • the radio resource control connection release message is received, it is connected to the above-mentioned fifth-generation mobile communication network; among them, the above-mentioned goodbye BYE message and the above-mentioned good 200 (OK) message are messages in the session initiation protocol, and the above-mentioned goodbye
  • the BYE message is used to indicate the end of the IMS voice communication, and the good 200 (OK) message is used to respond to the goodbye BYE message.
  • the processing unit 520 is specifically configured to: after receiving the radio resource control connection release message, and before receiving the evolved packet system EPS fallback indication message, there is no service quality flow of the IMS voice. At the time, access to the above-mentioned fifth-generation mobile communication network.
  • the processing unit 520 is specifically configured to: fail to report a measurement report within a preset period of time before receiving the radio resource control connection release message and receiving the evolved packet system EPS fallback indication message At the time, access to the above-mentioned fifth-generation mobile communication network.
  • the aforementioned measurement report refers to a measurement report that includes the B1 event, or the B2 event, or the B1 event and the B2 event.
  • the aforementioned EPS fallback indication message is a mobility message from a new wireless command.
  • the above-mentioned EPS fallback indication message is a radio resource control release message.
  • the foregoing processing unit 520 is specifically configured to: reconnect to the foregoing first access network device supporting the fifth generation mobile communication network.
  • the foregoing processing unit 520 is specifically configured to search for and access to a third access network device supporting the fifth generation mobile communication network.
  • the wireless communication device can implement part or all of the steps in the IMS voice communication method in the embodiment shown in FIG. 4 through the foregoing unit. It should be understood that the embodiments of the present application are device embodiments corresponding to the method embodiments, and the description of the method embodiments is also applicable to the embodiments of the present application.
  • FIG. 6 is a schematic block diagram of a wireless communication device according to another embodiment of the present application.
  • the wireless communication device in this embodiment as shown in the figure may include: a processor 610, a transceiver 620, and a memory 630.
  • the aforementioned processor 61, transceiver 620, and memory 630 are connected through a bus 640.
  • the processor 610 may be a central processing unit (CPU, central processing unit), a general-purpose processor, a co-processor, a digital signal processor (digital signal processor, DSP), or an application-specific integrated circuit (ASIC). , Field Programmable Gate Array (FPGA, field programmable gate array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • the processor 610 may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the processor 610 calls the program code stored in the memory 630 to execute the steps executed by the wireless communication device in the foregoing method embodiment. specific:
  • the foregoing transceiver 620 is configured to perform the function of the receiving unit 510, and is configured to receive the EPS fallback indication message of the evolved packet system; the foregoing processor 610 is configured to perform the function of the processing unit 520, and is configured to perform the functions of the fifth-generation mobile communication network.
  • the first access network device is switched to the second access network device supporting the fourth-generation mobile communication network to perform Internet Protocol Multimedia Subsystem IMS voice communication;
  • the transceiver 620 is also used to receive the radio resource control connection release message, The radio resource control connection release message does not carry redirection indication information;
  • the processor 610 is further configured to access the fifth generation mobile communication network after receiving the radio resource control connection release message after completing the IMS voice communication .
  • the aforementioned processor 610 is specifically configured to: after sending a goodbye BYE message and receiving a good 200 (OK) message, or after receiving a goodbye BYE message and sending a good 200 (OK)
  • the radio resource control connection release message is received, it is connected to the above-mentioned fifth-generation mobile communication network; among them, the above-mentioned goodbye BYE message and the above-mentioned good 200 (OK) message are messages in the session initiation protocol, and the above-mentioned goodbye
  • the BYE message is used to indicate the end of the IMS voice communication, and the good 200 (OK) message is used to respond to the goodbye BYE message.
  • the above-mentioned processor 610 is specifically configured to: after receiving the radio resource control connection release message, and before receiving the above-mentioned evolved packet system EPS fallback indication message, there is no service quality flow of the above-mentioned IMS voice At the time, access to the above-mentioned fifth-generation mobile communication network.
  • the aforementioned processor 610 is specifically configured to: fail to report a measurement report within a preset period of time before receiving the radio resource control connection release message and before receiving the aforementioned evolved packet system EPS fallback indication message At the time, access to the above-mentioned fifth-generation mobile communication network.
  • the aforementioned measurement report refers to a measurement report that includes the B1 event, or the B2 event, or the B1 event and the B2 event.
  • the aforementioned EPS fallback indication message is a mobility message from a new wireless command.
  • the above-mentioned EPS fallback indication message is a radio resource control release message.
  • the aforementioned processor 610 is specifically configured to: reconnect to the aforementioned first access network device supporting the fifth generation mobile communication network.
  • the above-mentioned processor 610 is specifically configured to search for and access to a third access network device supporting the fifth generation mobile communication network.
  • the principle of the wireless communication device provided in the embodiment of the application for solving the problem is similar to the principle of the wireless communication device of the method embodiment of the application for solving the problem. Therefore, the implementation of each device can refer to the implementation of the method. For concise description, I won't repeat it here.
  • the functions described in the present invention can be implemented by hardware, software, firmware or any combination thereof.
  • these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium.
  • the computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another.
  • the storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

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Abstract

本申请公开了互联网协议多媒体子系统IMS语音通信方法、无线通信装置及通信系统，其中方法包括：接收演进分组系统EPS回落指示消息；从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行IMS语音通信；结束所述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络，其中，所述无线资源控制连接释放消息不携带重定向载波信息。终端在接收到演进分组系统EPS回落指示消息之后，从第五代移动通信网络回落到第四代移动通信网络，然后自主识别需要自主返回的场景，并在需要自主返回的场景下自主返回到第五代移动通信网络。

Description

一种IMS语音通信方法、无线通信装置及通信系统 技术领域
本申请涉及通信技术领域，尤其涉及一种IMS语音通信方法、无线通信装置及通信系统。
背景技术
终端在第五代移动通信网络中进行通信的过程中可能会发生演进分组系统回落(EPS Fallback，或者Evolved Packet System Fallback)，即从第五代移动通信网络回落到第四代移动通信网络。在发生回落之后，终端可以通过第四代移动通信网络的接入网设备重定向来返回到回落之前所在的第五代移动通信网络。
但是目前第四代移动通信网络的接入网设备本身不具备上述重定向功能，只有在升级之后，才支持将回落到第四代移动通信网络的终端重定向到第五代移动通信网络。目前往往不建议对接入网设备进行升级，因为接入网设备升级面临着诸多的问题。接下来将简单列举几个问题：首先，升级需要对接入网设备的空口进行修改，使得接入网设备支持上述重定向功能，但是空口修改不仅繁琐，而且还容易发生错误，导致系统不兼容；其次，对于一些版本老旧的接入网设备来说，不仅需要对上述重定向功能进行升级，而且在对上述重定向功能升级之前，还需要对接入网设备中的其他众多功能先行升级；再其次，由于升级会限制通信流量，甚至是完全断开通信服务，因此为了尽可能的减少对用户正常通信的影响，接入网设备的升级工作一般都是在通信流量较小的深夜展开。可见，接入网设备升级不仅成本高，而且困难重重。
发明内容
本申请实施例提供了一种互联网协议多媒体子系统(IMS，IP Multimedia Subsystem)语音通信方法，使得终端在演进分组系统回落(EPS Fallback，或者Evolved Packet System Fallback)之后，可以自主返回第五代移动通信网络。
应理解，本申请实施例中的方法可以由无线通信装置执行，该无线通信装置可以是计算设备的整机，也可以是该计算设备中的部分器件，例如无线通信功能相关的芯片，如系统芯片、通信芯片或射频芯片。其中，系统芯片也称为片上系统，或称为SoC芯片。具体地，无线通信装置可以是诸如智能手机这样的终端，也可以是能够被设置在终端中的系统芯片或通信芯片。通信芯片可以包括射频处理芯片和基带处理芯片的一种或多种。基带处理芯片有时也称为调制解调器(modem)或基带处理器。在物理实现中，通信芯片可集成在SoC芯片内部，也可以不与SoC芯片集成。例如，基带处理芯片集成在SoC芯片中，射频处理芯片不与SoC芯片集成。
第一方面，本申请实施例提供了一种IMS语音通信方法，无线通信装置在接收到第一接入网设备所发送的演进分组系统(EPS，Evolved Packet System)回落指示消息之后，响应于该EPS回落指示消息，从第五代移动通信网络回落到第四代移动通信网络，也即是从 第五代移动通信网络的第一接入网设备切换到第四代移动通信网络的第二接入网设备；然后无线通信装置在连接到第二接入网设备之后，便通过第四代移动通信网络进行互联网协议多媒体子系统(IMS，IP Multimedia Subsystem)语音通信；无线通信装置在结束该IMS语音通信后，在接收到无线资源控制连接释放(RRCConnectionRelease)消息时接入到第五代移动通信网络的第一接入网设备或者第三接入网设备，这里，该无线资源控制连接释放消息不携带重定向载波信息(redirectedCarrierInfo)。其中，上述EPS回落指示消息为来自新无线命令的移动性消息(MobilityFromNRCommand)消息，或者，无线资源控制释放(RRCRelease)消息。第三接入网设备为第五代移动通信网络下，除了第二接入网设备以外的任意接入网设备。
应理解，无线通信装置结束该IMS语音通信指的是，该无线通信装置在进行IMS主叫业务下，发送再见BYE消息，并接收到好的200(OK)消息，或者，该无线通信装置在进行IMS被叫业务下，接收到再见BYE消息，并响应于该再见BYE消息发送好的200(OK)消息。其中，再见BYE消息和好的200(OK)消息为会话初始协议(SIP，Session Initiation Protocol)中的消息，具体地，再见BYE消息用于指示该IMS语音通信结束，该好的200(OK)消息用于响应该再见BYE消息。
基于第一方面所描述的方法，无线通信装置在回落之后可以自主地识别当前的场景是否为需要自主返回的场景，并在需要自主返回的场景下发起自主返回，而在不需要自主返回的场景下则减少无效的自主返回尝试。因此通过本申请实施例的方法，无线通信装置可以在支持第四代移动通信网络的接入网设备不升级的情况下，避免滞留在第四代移动通信网络，自主返回第五代移动通信并获取更好的通信体验。
在一种可实施的方式中，无线通信装置结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息前不存在所述IMS语音的服务质量流(QoS Flow，Quality of Service Flow)时，接入到所述第五代移动通信网络。基于该种实施方式，无线通信装置可以通过进一步确定回落是否是因为第五代移动通信网络不支持IMS语音通信导致的，来更加准确识别当前场景是否为需要自主返回的场景。
在一种可实施的方式中，无线通信装置结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到所述第五代移动通信网络。
其中，预设时长为提前设置的特定时长，这里测量报告可以是普通的测量报告，或者，可以指的是包括特定切换事件的测量报告。上述测量报告可以体现该无线通信装置的通信质量。其中，上述特定切换事件包括B1事件和B2事件中的一种或两种。其中，B1事件用于指示异系统小区的质量优于门限，B2事件用于指示无线通信装置所在的服务小区质量低于门限1，且异系统小区的质量优于门限2。基于该种实施方式，无线通信装置可以通过快速确定EPS回落不是因为无线通信装置在第五代移动通信网络的通信质量差而导致的，来更加准确识别当前场景是否为需要自主返回的场景。
第二方面，提供了一种无线通信装置，该无线通信装置可以为终端设备或用于终端设备的装置。例如，终端设备可以是手机、穿戴式设备或平板电脑等。用于终端设备的装置 可以为终端设备内的芯片。该无线通信装置可执行述第一方面以及第一方面的可实施方式中任意一项所描述的方法。该无线通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该无线通信装置包括：
接收单元，用于接收演进分组系统EPS回落指示消息；处理单元，用于从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行互联网协议多媒体子系统IMS语音通信；上述接收单元，还用于接收无线资源控制连接释放消息(RRCConnectionRelease)，上述无线资源控制连接释放消息不携带重定向指示信息(redirectedCarrierInfo)；上述处理单元，用于在完成上述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络。其中，上述EPS回落指示消息为来自新无线命令的移动性消息(MobilityFromNRCommand)消息，或者，无线资源控制释放(RRCRelease)消息。第三接入网设备为第五代移动通信网络下，除了第二接入网设备以外的任意接入网设备。
在一种可实施的方式中，上述处理单元，具体用于：在发送再见BYE消息并接收到好的OK消息后，或者，在接收再见BYE消息并发送好的OK消息后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络；其中，上述再见BYE消息和上述OK消息为会话初始协议中的消息，上述再见BYE消息用于指示上述IMS语音通信结束，上述OK消息用于响应上述再见BYE消息。
在一种可实施的方式中，上述处理单元，具体用于：结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息前不存在上述IMS语音的服务质量流时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述处理单元，具体用于：结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到上述第五代移动通信网络。其中，测量报告可以是一般的测量报告，也可以特指包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
第三方面，提供了一种无线通信装置，该无线通信装置可以为终端设备或用于终端设备的装置。例如，终端设备可以是手机、穿戴式设备或平板电脑等。用于终端设备的装置可以为终端设备内的芯片。该无线通信装置包括处理器以及收发器。其中，处理器与收发器相连。可选的，该无线通信装置还包括存储器。处理器与该存储器相连。
在一种可实施的方式中，当无线通信装置为终端设备时，收发器可以包括天线以及与天线相连的射频电路。该收发器用于实现无线通信装置与其他网元之间的通信。例如，该收发器用于实现无线通信装置与网络设备之间的通信。
在一种可实施的方式中，该无线通信装置为用于终端设备的装置时，该收发器可以为接口电路，该接口电路用于该处理器获取或者输出信息或数据。例如，该接口电路用于该处理器从存储器读取数据或者写入数据，又如，该接口电路用于该处理器接收来自设备外部的信息或数据，或者向设备外部发送信息或数据。
其中，处理器用于执行上述第一方面以及第一方面的可实施方式中任意一项的方法。
其中，该存储器用于存储程序，该处理器调用存储在该存储器中的程序以执行上述第一方面以及第一方面的可实施方式中任意一项的方法。该处理器所执行的操作及有益效果可以参见上述第一方面以及第一方面的可实施方式中任意一项所描述的方法以及有益效果，重复之处不再赘述。
第四方面，提供了一种通信系统。上述通信系统包括无线通信装置和第一接入网设备，其中：上述第一接入网设备，用于向上述无线通信装置发送演进分组系统EPS回落指示消息；上述无线通信装置，用于接收上述第一接入网设备发送的演进分组系统EPS回落指示消息，然后从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行IMS语音通信；上述无线通信装置，还用于结束上述IMS语音通信后，在接收到无线资源控制连接释放消息(RRCConnectionRelease)时，接入到上述第五代移动通信网络，其中，上述无线资源控制连接释放消息不携带重定向载波信息(redirectedCarrierInfo)。其中，上述EPS回落指示消息为来自新无线命令的移动性消息(MobilityFromNRCommand)消息，或者，无线资源控制释放(RRCRelease)消息。第三接入网设备为第五代移动通信网络下，除了第二接入网设备以外的任意接入网设备。
在一种可实施的方式中，上述无线通信装置结束IMS语音通信指的是，在发送再见BYE消息并接收到好的OK消息后，或者，在接收再见BYE消息并发送好的OK消息后，其中，上述再见BYE消息和上述OK消息为会话初始协议中的消息，上述再见BYE消息用于指示上述IMS语音通信结束，上述OK消息用于响应上述再见BYE消息。
在一种可实施的方式中，上述无线通信装置，具体用于结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息前不存在上述IMS语音的服务质量流时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述无线通信装置，具体用于结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到上述第五代移动通信网络。其中，测量报告可以是一般的测量报告，也可以特指包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
第五方面，提供了一种计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面或第一方面可能的实现方式中的方法。
第六方面，提了供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第一方面或第一方面的可实施方式中的方法。
附图说明
为了更清楚地说明本申请实施例技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍。
图1是本申请实施例提供的一种通信系统的架构示意图；
图2是本申请实施例提供的一种IMS语音通信方法的流程示意图；
图3是本申请实施例提供的另一种IMS语音通信方法的流程示意图；
图4是本申请实施例提供的一种IMS语音通信方法的流程示意图；
图5是本申请实施例提供的一种无线通信装置的示意性框图；
图6是本申请实施例提供的一种无线通信装置的结构性框图。
具体实施方式
本申请实施例提供了一种IMS语音通信方法、无线通信装置及通信系统。其中，IMS语音通信方法可以由无线通信装置执行。无线通信装置可以是终端，也可以是用于终端设备的装置。用于终端设备的装置可以为终端设备内的芯片等。接下来以终端为执行主体对该IMS语音通信方法进行说明。通过实施本申请实施例的方法，终端能够在从第五代(5G，5th generation)移动通信网络回落到第四代(4G，4th generation)移动通信网络之后，自主识别需要自主返回的场景并触发返回到5G移动通信网络，而不需要4G移动通信网络的接入网设备指示终端重定向到5G移动通信网络。
下面对本申请实施例可应用的通信系统的架构进行说明。如图1中的通信系统的构架所示，通信系统包括终端、第一接入网设备和第二接入网设备。第一接入网设备为下一代节点B(gNodeB或gNB，next generation Node B)；第二接入网设备为演进型节点B(eNodeB或eNB，evolved Node B)。可选地，该通信系统还可以包括其他接入网设备(如第三接入网设备)和终端，第三接入网设备也为gNB，且第一接入网设备、第二接入网设备和第三接入网设备为不同设备，这里不再赘述。
其中，终端也可以被称为用户设备(user equipment，UE)，移动台(mobile station，MS)或订户单元(subscriber unit，SU)。终端具体可以是但不限于移动电话、平板电脑(tablet computer)，膝上型电脑(laptop computer)，可穿戴设备(智能手表、智能手环，智能头盔，智能眼镜等)，以及其他具备无线接入能力的通信设备，如各种物联网设备，包括智能家居设备(智能电表、智能家电等)，智能车辆等。
其中，接入网设备可以为特定的地理区域提供通信覆盖，并且可以与位于上述覆盖区域内的终端进行通信，接入网设备可以支持不同制式的通信协议，或者可以支持不同的通信模式。
终端可以通过接入网设备接入到相应的移动通信网络中，这里，以第一接入网设备支持5G移动通信网络，第二接入网设备支持4G移动通信网络为例。一般而言，从5G移动通信网络所获得的通信效果和服务体验会优于4G移动通信网络，但在通信环境不稳定等少数情况下，4G移动通信网络的通信效果实际可能优于5G移动通信网络。因此，终端在进行通信的时候，优选接入到5G移动通信网络，只有在该终端在5G移动通信网络中的通信质量较差，或者5G移动通信网络不支持该终端所需要进行的IMS语音通信的情况下，终端才会从5G移动通信网络回落到4G移动通信网络。其中，IMS语音通信包括普通的语音通话(voice call)业务、紧急呼叫(emergency call)业务以及视频通话(video call)业务等。
综上，终端在与支持5G移动通信网络的第一接入网设备保持连接状态的过程中，可能会从5G移动通信网络下的第一接入网设备切换到4G移动通信网络下的第二接入网设备，从而发生由5G移动通信网络回落到4G移动通信网络的演进型分组系统回落(EPS  Fallback，或者Evolved Packet System Fallback)。由于在大多数情况下5G移动通信网络的通信效果优于4G移动通信网络，因此即使是发生了回落，终端也希望尽快的返回5G移动通信网络以获得更高质量的通信服务。
对此，可以采用接入网设备重定向的方式，指示终端返回到回落之前所在的5G移动通信网络。但现实情况是，4G移动通信网络下的接入网设备需要升级之后才支持将终端重定向到5G移动通信网络。
为了解决以上问题，本申请提供了一种IMS语音通信方法，可以实现终端的自主返回，而不需要在4G移动通信网络下的接入网设备指示下返回。具体的，终端接收到5G移动通信网络的第一接入网设备发送的演进分组系统(EPS，Evolved Packet System)回落指示消息。然后终端根据该EPS回落指示消息从5G移动通信网络回落到4G移动通信网络，即从5G移动通信网络下的第一接入网设备切换到4G移动通信网络下的第二接入网设备。终端回落成功后，便通过4G移动通信网络进行IMS语音通信。最后终端在完成IMS语音通信，且接收到不携带重定向载波信息的无线资源控制连接释放消息时，接入到5G移动通信网络。
为了能够更好地理解上述本申请提供的IMS语音通信方法，本申请将进行更详细的介绍。举例来说，第一接入设备与终端在保持连接状态时，第一接入设备向终端发送EPS回落指示消息，以指示终端从5G移动通信网络下的第一接入设备切换到4G移动通信网络下的第二接入设备。该回落指示消息可以是第三代合作伙伴计划(3GPP，3rd generation partnership project)技术规范中记载的来自新无线命令的移动性(MobilityFromNRCommand)消息，也可以是无线资源控制释放(RRCRelease)消息。终端在接收到回落指示消息之后，根据该回落指示消息连接到第二接入设备，以回落到4G来执行IMS语音通信。由于终端回落之后便进行IMS语音通信，从而可以确定回落是因为5G移动通信网络不支持IMS语音通信而导致的，而不是因为终端在5G移动通信网络的通信质量差而导致的。因此在完成IMS语音通信之后，若识别到当前场景为需要自主返回的场景，即接收到不携带重定向载波信息(redirectedCarrierInfo)字段(field)的无线资源控制连接释放(RRCConnectionRelease)消息时，便自主接入到5G移动通信网络。
需要注意的，本申请终端是自主返回到5G移动通信网络的，不需要根据接入网设备的指示接入到5G移动通信网络。可以理解的是，网络侧下发的无线资源控制连接释放消息存在多种类型，终端可以根据所接收的无线资源控制连接释放消息中是否包括重定向载波信息字段，以及该重定向载波信息字段上所携带的信息来确定终端在接收到该无线资源控制连接释放消息后，重定向到哪个制式或者哪个频率的小区。
具体的，根据3GPP TS36.331技术规范(例如3GPP TS36.331 V15.4.0技术规范)可知，在现有技术中，在无线通信网络接收到的无线资源控制连接释放消息不携带重定向载波信息时，无线通信网络根据3GPP技术规范所规定的进入空闲(IDLE)态，然后自主发起接入到5G移动通信网络的入网流程；在无线通信网络接收到的无线资源控制连接释放消息携带重定向载波信息时，无线通信网络根据该无线资源控制连接释放消息，接入到该无线资源控制连接释放消息携带的重定向载波信息所指向的移动通信网络。例如，当无线资源控制连接释放消息的重定向载波信息字段上所携带的信息为第五代移动通信技术载波信息 (CarrierInfoNR)时，终端根据该无线资源控制连接释放消息接入到5G移动通信网络；在无线资源控制连接释放消息的重定向载波信息字段上所携带的信息为全球移动通信无线接入网络载波频率信息(CarrierFreqGERAN)时，终端根据该无线资源控制连接释放消息接入到全球移动通信(GSM，Global System for Mobile Communications)系统；在无线资源控制连接释放消息的重定向载波信息字段上所携带的信息为通用陆面无线接入网绝对无线频道编号值信息(ARFCN-ValueUTRA)时，终端根据该无线资源控制连接释放消息接入到通用陆面无线接入(UTRA，Universal Terrestrial Radio Access)网络；在无线资源控制连接释放消息的重定向载波信息字段上所携带的信息为码分多址接入网载波频率信息(CarrierFreqCDMA2000)时，终端根据该无线资源控制连接释放消息接入到码分多址接入(CDMA，Code Division Multiple Access)网络；在无线资源控制连接释放消息的重定向载波信息字段上所携带的信息为演进通用陆面无线接入网绝对无线频道编号值信息(ARFCN-ValueEUTRA)时，终端根据该无线资源控制连接释放消息接入到全球移动通信系统长期演进(LTE，Long-Term Evolution)系统。
图2是本申请实施例提供的一种IMS语音通信方法的流程示意图，图3是本申请实施例提供的另一种IMS语音通信方法的流程示意图。如图2和图3所示，终端发起主叫业务。应理解，IMS语音通信过程主要采用会话初始化协议(SIP，Session Initiation Protocol)，来进行建立、修改和终止IMS语音通信会话。
如图2所示，IMS语音通信方法主要包括：
201、终端向接入网设备发送请求(INVITE)消息，该请求消息用于请求与被叫用户建立会话。
202、终端接收接入网设备发送的尝试100(Trying)消息，该尝试100(Trying)消息用于指示已收到请求消息。
203、终端接收接入网设备发送的振铃180(Ringing)消息，该振铃180(Ringing)消息用于指示终端振铃。
204、终端接收接入网设备发送的好的200(OK)消息，该好的200(OK)消息用于指示被叫用户接听会话。
205、终端向接入网设备发送确认(ACK)消息，该确认(ACK)消息用于已接收到对于该请求消息的最终响应。
206、终端接收接入网设备发送的再见(BYE)消息，该再(BYE)见消息用于指示结束会话。
207、终端向接入网设备发送好的200(OK)消息，该好的200(OK)消息用于响应该再见(BYE)消息。
或者，如图3所示，IMS语音通信方法主要包括301至307部分，其中，301至305部分与201至205部分相同，这里不再重复赘述。
306、终端向接入网设备发送再见(BYE)消息，该再见(BYE)消息用于指示结束会话。
307、终端接收接入网设备发送的好的200(OK)消息，该好的200(OK)消息用于 响应该再见(BYE)消息。
由图2和图3可知，终端在发送再见(BYE)消息并接收好的200(OK)消息时，或者，终端在接收再见(BYE)消息并发送好的200(OK)消息时，表征着该IMS语音通信的结束。其中，图2和图3所示意的IMS语音通信方法的流程示意图的区别主要在于是由主叫方还是被叫方发起终止该IMS语音通信。
为了能够更好地理解本申请实施例，接下来将结合图4所示的流程示意图来对本申请具体实施例作进一步的详细描述。请参见图4，图4是本申请实施例提供的另一种IMS语音通信方法的流程示意图。如图4所示，该IMS语音通信方法包括401～403部分，其中：
401、第一接入网设备向终端发送演进分组系统EPS回落指示消息。
在本申请实施例中，第一接入网设备向终端发送EPS回落指示消息，该EPS回落指示消息用于指示终端从5G移动通信网络的第一接入网设备切换到4G移动通信网络的第二接入网设备。需要注意的是，EPS回落指示消息用于指示终端正在执行回落过程，在接收到该EPS回落指示消息之前，终端无法从空口准确得知是否发生了回落。
在一种可实施的方式中，上述EPS回落指示消息可以是3gpp技术规范所规定的来自新无线命令的移动性消息(MobilityFromNRCommand)消息，也可以是无线资源控制释放(RRCRelease)消息。
在一种可实施的方式中，第一接入网设备向终端发送EPS回落指示消息之前，第一接入网设备向终端发起IMS语音通信，或者终端向第一接入网设备发起IMS语音通信，本申请对此不作限定。终端向第一接入网设备发起IMS语音通信的过程被成为主叫(MO，Mobile Original call)，第一接入网设备向终端发起IMS语音通信的过程被称为被叫(MT，Mobile terminal call)。
402、终端在接收到第一接入网设备发送的演进分组系统EPS回落指示消息之后，从支持第五代移动通信网络的第一接入网设备连接到支持第四代移动通信网络的第二接入网设备，进行互联网协议多媒体子系统IMS语音通信。
在本申请实施例中，终端接收到支持5G移动通信网络的第一接入网设备发送的EPS回落指示消息之后，根据该EPS回落指示消息接入到支持4G移动通信网络的第二接入网设备，以回落到4G移动通信网络，并通过4G移动通信网络进行IMS语音通信。其中，通过4G移动通信网络进行IMS语音通信指的是，第二接入网设备通过为IMS语音通信分配无线资源，并在终端与接入网设备之间建立用于传输IMS语音通信的业务数据的服务质量流(QoS Flow，Quality of Service Flow)，以完成IMS语音通信。
403、终端结束互联网协议多媒体子系统IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到第五代移动通信网络，其中，无线资源控制连接释放消息不携带重定向载波信息。
在本申请实施例中，终端回落是因为5G移动通信网络不支持IMS语音通信导致的，则终端需要在完成IMS语音通信之后返回到5G移动通信网络，以尽量为获取更高质量的通信服务。具体的，终端完成IMS语音通信之后，接收到第二接入网设备发送的不携带重定向载波信息的无线资源控制连接释放消息时，自主接入到5G移动通信网络。为了返回 到5G移动通信网络，终端可以接入到5G移动通信网络下的任意接入网设备，包括但不限于第一接入网设备。例如，终端可以重新接入到支持第五代移动通信网络的第一接入网设备，或者，搜索并接入到支持第五代移动通信网络的第三接入网设备。其中，终端自主接入到5G移动通信网络的过程可以为传统的终端入网流程，例如，主要包括三个阶段：第一阶段，小区搜索与小区选择；第二阶段，随机接入；第三阶段，注册(REGISTRATION)。
在一种可实施的方式中，终端在发送再见BYE消息并接收到好的200(OK)消息后，或者，在接收再见BYE消息并发送好的200(OK)消息后，标志着IMS语音通信结束。其中，BYE消息和好的200(OK)消息为会话初始协议中的消息，BYE消息用于指示IMS语音通信结束，好的200(OK)消息用于响应再见BYE消息。
需要说明的是，终端完成IMS语音通信之后，若接收到不携带重定向载波信息的无线资源控制连接释放消息，则相当于识别到当前场景为需要自主返回的场景。反之，则识别到当前场景不是需要自主返回的场景，因此不进行无效的自主返回尝试。
还需要说明的是，终端可以确定当前是否在进行IMS语音通信。在终端向接入网设备发起IMS语音通信，或者接入网设备在向终端发起IMS语音通信时，终端会发送或者接收到一个用于发起IMS语音通信的邀请(Invite)信令。因此终端若检测到本端发送了或者接收到邀请(Invite)信令，则可以确定终端正在进行IMS语音通信。
还需要说明的是，终端之所以需要在完成IMS语音通信之后返回5G，是因为终端在回落之前会接收到5G下的第一接入网设备发送的注册接收(REGISTRATION ACCEPT)消息，该注册接收消息指示了5G移动通信网络不支持IMS语音通信。因此当终端在回落之后执行IMS语音通信，便可以确定回落是因为5G移动通信网络不支持IMS语音通信导致的，因此需要在完成IMS语音通信之后返回5G移动通信网络。其中，注册接收消息中的互联网协议多媒体子系统分组语音业务(IMS-VoPS)字段记载了关于5G移动通信网络是否支持当前接入的IMS语音通信的内容，若IMS-VoPS字段下的数值为00，则代表5G移动通信网络不支持支持当前接入的IMS语音通信。
对于上述终端在完成IMS语音通信之后接入到第五代移动通信网络的情况有多种，主要包括四种情况。接下来将对该四种情况进行详细描述。
第一种情况：终端结束IMS语音通信之后，在接收到不携带重定向载波信息的无线资源控制连接释放消息时，接入到上述第五代移动通信网络。
在本申请实施例中，终端在完成IMS语音通信之后，若接收到不携带重定向载波信息的无线资源控制连接释放消息时，则自主接入到5G移动通信网络。因为第二接入网设备下发的无线资源控制连接释放消息中不携带重定向载波信息，则表示第二接入网设备不支持将终端重定向到5G移动通信网络。因此终端在完成IMS语音通信，并且确定4G移动通信网络下的第二接入网设备不支持将终端重定向到5G移动通信网络时，自主发起接入到5G移动通信网络的入网流程，以接入到5G移动通信网络。
第二种情况：终端结束IMS语音通信后，接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息前不存在IMS语音的服务质量流时，接入到第五代移动通信网络。
本申请实施例可以进一步确定回落是否是因为5G移动通信网络不支持IMS语音通信 导致的。具体的。终端在接收到EPS回落指示消息之前未检测到IMS语音通信的服务质量流，则可以说明终端与5G下的第一接入网设备之间发起了IMS语音流程，却没有建立IMS语音通信的服务质量流(QoS Flow，Quality of Service Flow)，从而可以更加准确的确定终端的回落是因为5G移动通信网络不支持IMS语音通信而导致的。因此终端结束IMS语音通信后，在接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述EPS回落指示消息前不存在IMS语音的服务质量流时，接入到第五代移动通信网络。
需要说明的是，在IMS语音通信发起之后，终端与接入网设备之间会建立起QoS Flow来传输IMS语音通信的数据。QoS Flow中不仅包含IMS语音通信的业务数据(例如用户的语音数据和视频数据)，还包含QoS Flow的QoS标识(5QI)。终端通过读取QoS Flow的5QI，确定终端与接入网设备之间建立的QoS Flow是否为IMS语音通信的QoS Flow。具体的，终端检测与接入网设备之间建立的QoS Flow的5QI是否为1或者2，若是，则确定检测到IMS语音通信的QoS Flow。其中，若QoS Flow的5QI为1，则确定IMS语音通信的QoS Flow为语音业务(Conversational Voice)的QoS Flow；若QoS Flow的5QI为2，则确定IMS语音通信的QoS Flow为视频业务(Conversational Video)的QoS Flow。
第三种情况：终端结束IMS语音通信后，接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到第五代移动通信网络。其中，测量报告为包含有任意事件的测量报告，预设时长可以为任意时长，本申请对此不作限定。
本申请实施例除了可以确定5G移动通信网络是因为不支持IMS语音通信导致的，还可以通过确定终端在接收到EPS回落指示消息前的预设时长内未是否上报测量报告，来进一步确定回落是否因为终端在5G移动通信网络中的通信质量差导致的。若终端在接收到EPS回落指示消息前的预设时长内未上报测量报告，则确定回落不是因为终端在5G移动通信网络中的通信质量差导致的；若终端在接收到EPS回落指示消息前的预设时长内上报了测量报告，则回落可能是因为终端在5G移动通信网络中的通信质量差导致的。如果是因为5G移动通信网络不支持IMS语音通信，而不是因为通信质量差而导致的，则终端需要在完成IMS语音通信之后返回到5G移动通信网络，以尽量获取更高质量的通信服务。因此终端结束IMS语音通信后，接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述EPS回落指示消息之前的预设时长内未上报测量报告时，接入到第五代移动通信网络。
需要说明的是，测量报告中包含了用于指示通信质量的事件，接入网设备在接收到终端发送的测量报告之后，根据测量报告中的事件来执行例如指示终端切换连接到其他的接入网设备等操作，以提高终端的通信质量。因此在终端没有上报测量报告的时候，终端当前所在的移动通信网络的通信质量是可以被认为是比较好的。因此终端在接收到EPS回落指示消息之前的预设时长内未上报测量报告的情况下，可以确定终端回落不是因为在5G移动通信网络中的通信质量差导致的。
第四种情况：终端结束IMS语音通信后，接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到第五代移动通信网络。其中，测量报告为包括B1事件，或者，B2 事件，或者，B1事件和B2事件的测量报告。预设时长可以为任意时长，本申请对此不作限定。
本申请实施例除了可以确定5G移动通信网络是因为不支持IMS语音通信导致的，还可以通过确定在接收到演进分组系统EPS回落指示消息前的预设时长内未上报包括有特定切换事件的测量报告，来确定回落不是因为终端在5G移动通信网络中的通信质量差导致的。如果是因为5G移动通信网络不支持IMS语音通信，而不是因为通信质量差而导致的，则需要在完成IMS语音通信之后返回到5G移动通信网络，以尽量为终端提供更高质量的通信服务。因此终端结束IMS语音通信后，接收到不携带重定向载波信息的无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报包括有特定切换事件的测量报告时，接入到第五代移动通信网络。其中，特定切换事件包括B1事件和B2事件中的至少一种。
需要说明的是，测量报告中包含的所有事件并非一定导致回落的发生，只有当测量报告中包含有例如B1事件和B2事件中的至少一种的特定切换事件时，才可能会导致回落的发生。具体的，测量报告中包含用于指示通信质量的事件，例如有A类事件和B类事件，A类事件为用于指示同系统内的小区的通信质量，B类事件由于指示异系统间的小区的通信质量。由于5G移动通信网络回落到4G移动通信网络属于异系统的切换事件，因此本申请只关注测量报告中的B类事件，B类事件包括B1事件和B2事件，B1事件的含义为异系统小区的质量优于门限，B2事件的含义为服务小区质量低于门限1，且异系统小区的质量优于门限2。因此终端在接收到EPS回落指示消息之前的预设时长内未上报包含有B1事件和B2事件中的至少一种事件的测量报告的情况下，可以确定终端回落不是因为在5G移动通信网络中的通信质量差导致的。
可见，除了第一种情况和第二种情况只需要确定回落是因为5G移动通信网络不支持IMS语音通信导致的以外，第三种情况和第四种情况不仅需要确定回落是因为5G移动通信网络不支持IMS语音通信导致的，还需要确定回落不是因为终端在5G移动通信网络时的通信质量差才导致的。
还需要说明的是，除了上述几种情况以外，还可以组合上述几种情况，例如：终端结束IMS语音通信后，接收到无线资源控制连接释放消息，在接收到EPS回落指示消息前不存在IMS语音的服务质量流，且接收到演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到第五代移动通信网络；还例如：终端结束IMS语音通信后，接收到无线资源控制连接释放消息，在接收到EPS回落指示消息前不存在IMS语音的服务质量流，且在接收到演进分组系统EPS回落指示消息之前的预设时长内未上报包含有特定切换事件的测量报告时，接入到第五代移动通信网络。但需要注意的是，虽然组合上述四种情况可以更准确的确定当前场景是否为需要自主返回的场景，但是经过实际验证发现，上述四种情况已经可以很准确的确定当前场景是否为需要自主返回的场景，于是在一些尤其关注于通信时延以及通信质量的通信场景下，单独采用上述四种情况中的任意一种，相对于上述组合情况来说，会缩短确定时间，更快速的自主返回到5G移动通信网络，因此可以获得更好的通信效果。
根据图4以及上文的描述，可以看出终端在从5G移动通信网络回落到4G移动通信网 络之后，不是在任何情况下都需要自主返回到5G移动通信网络中。终端在从5G移动通信网络回落到4G移动通信网络并结束IMS语音业务后，自主识别当前场景是否为需要自主返回到5G移动通信网络的场景，并在需要自主返回的场景中自主返回到5G移动通信网络。具体的，终端结束IMS语音通信后，若接收到不携带重定向载波信息的无线资源控制连接释放消息，则确定4G移动通信网络下的第二接入网设备不支持将终端重定向到5G移动通信网络，因此终端不需要4G移动通信网络的第二接入网设备的指示便自主返回到5G移动通信网络。因此通过本申请的方法，终端在回落之后可以自主的识别当前的场景是否为需要自主返回的场景。并在需要自主返回的场景下及时发起自主返回，从而尽可能获取高质量的通信服务。而在不需要自主返回的场景下，则减少无效的自主返回尝试，因为无效的自主返回尝试会严重影响终端的正常通信。因此本实施例的方法不需要对4G移动通信网络下的接入网设备进行升级，便能够实现高效的通信过程，提高通信的效率。
需要说明的是，图1以及图4中所示内容为一种举例，并不构成对本申请实施例的限定，因为本申请不对终端、第一接入网设备和第二接入网设备等的具体表现形式进行限定。
参见图5，本发明实施例可以根据上述方法示例对设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本发明实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
本发明实施还提供了一种无线通信装置。该无线通信装置包括接收单元510和处理单元520，具体的：
接收单元510，用于接收演进分组系统EPS回落指示消息；
处理单元520，用于从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行互联网协议多媒体子系统IMS语音通信；
上述接收单元510，还用于接收无线资源控制连接释放消息，上述无线资源控制连接释放消息不携带重定向指示信息；
上述处理单元520，用于在完成上述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述处理单元520，具体用于：在发送再见BYE消息并接收到好的200(OK)消息后，或者，在接收再见BYE消息并发送好的200(OK)消息后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络；其中，上述再见BYE消息和上述好的200(OK)消息为会话初始协议中的消息，上述再见BYE消息用于指示上述IMS语音通信结束，上述好的200(OK)消息用于响应上述再见BYE消息。
在一种可实施的方式中，上述处理单元520，具体用于：在接收到无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息前不存在上述IMS语音的服务质量流时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述处理单元520，具体用于：在接收到无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量 报告时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述测量报告指的是包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
在一种可实施的方式中，上述EPS回落指示消息为来自新无线命令的移动性消息。
在一种可实施的方式中，上述EPS回落指示消息为无线资源控制释放消息。
在一种可实施的方式中，上述处理单元520，具体用于：重新接入到上述支持第五代移动通信网络的第一接入网设备。
在一种可实施的方式中，上述处理单元520，具体用于：搜索并接入到支持第五代移动通信网络的第三接入网设备。
具体的，该无线通信装置可通过上述单元实现上述图4所示实施例中的IMS语音通信方法中的部分或全部步骤。应理解，本申请实施例是对应方法实施例的装置实施例，对方法实施例的描述，也适用于本申请实施例。
参见图6，是本申请另一实施例提供的一种无线通信装置的示意框图。如图所示的本实施例中的无线通信装置可以包括：处理器610、收发器620和存储器630。上述处理器61、收发器620和存储器630通过总线640连接。
其中，处理器610可以是中央处理器(CPU，central processing unit)，通用处理器，协处理器，数字信号处理器(digital signal processor，DSP)，专用集成电路(ASIC，application-specific integrated circuit)，现场可编程门阵列(FPGA，field programmable gate array)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。该处理器610也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
其中，处理器610调用存储器630中存储的程序代码，可执行上述方法实施例中无线通信装置所执行的步骤。具体的：
上述收发器620，用于执行接收单元510的功能，用于接收演进分组系统EPS回落指示消息；上述处理器610，用于执行处理单元520的功能，用于从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行互联网协议多媒体子系统IMS语音通信；上述收发器620，还用于接收无线资源控制连接释放消息，上述无线资源控制连接释放消息不携带重定向指示信息；上述处理器610，还用于在完成上述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述处理器610，具体用于：在发送再见BYE消息并接收到好的200(OK)消息后，或者，在接收再见BYE消息并发送好的200(OK)消息后，在接收到无线资源控制连接释放消息时，接入到上述第五代移动通信网络；其中，上述再见BYE消息和上述好的200(OK)消息为会话初始协议中的消息，上述再见BYE消息用于指示上述IMS语音通信结束，上述好的200(OK)消息用于响应上述再见BYE消息。
在一种可实施的方式中，上述处理器610，具体用于：在接收到无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息前不存在上述IMS语音的服务质 量流时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述处理器610，具体用于：在接收到无线资源控制连接释放消息，且在接收到上述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到上述第五代移动通信网络。
在一种可实施的方式中，上述测量报告指的是包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
在一种可实施的方式中，上述EPS回落指示消息为来自新无线命令的移动性消息。
在一种可实施的方式中，上述EPS回落指示消息为无线资源控制释放消息。
在一种可实施的方式中，上述处理器610，具体用于：重新接入到上述支持第五代移动通信网络的第一接入网设备。
在一种可实施的方式中，上述处理器610，具体用于：搜索并接入到支持第五代移动通信网络的第三接入网设备。
基于同一发明构思，本申请实施例中提供的无线通信装置解决问题的原理与本申请方法实施例无线通信装置解决问题的原理相似，因此各设备的实施可以参见方法的实施，为简洁描述，在这里不再赘述。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上上述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (20)

  1. 一种互联网协议多媒体子系统IMS语音通信方法，其特征在于，包括：
    接收演进分组系统EPS回落指示消息；
    从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行IMS语音通信；
    结束所述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络，其中，所述无线资源控制连接释放消息不携带重定向载波信息。
  2. 根据权利要求1所述的方法，其特征在于，所述结束所述IMS语音通信后，具体指的是，在发送再见BYE消息并接收到好的200(OK)消息后，或者，在接收再见BYE消息并发送好的200(OK)消息后，其中，所述再见BYE消息和所述好的200(OK)消息为会话初始协议中的消息，所述再见BYE消息用于指示所述IMS语音通信结束，所述好的200(OK)消息用于响应所述再见BYE消息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络，具体包括：
    在接收到无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息前不存在所述IMS语音的服务质量流时，接入到所述第五代移动通信网络。
  4. 根据权利要求1或2所述的方法，其特征在于，所述在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络，具体包括：
    在接收到无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到所述第五代移动通信网络。
  5. 根据权利要求4所述的方法，其特征在于，所述测量报告指的是包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
  6. 根据权利要求1至5任一所述的方法，其特征在于，所述EPS回落指示消息为来自新无线命令的移动性消息。
  7. 根据权利要求1至5任一所述的方法，其特征在于，所述EPS回落指示消息为无线资源控制释放消息。
  8. 根据权利要求1至7任一所述的方法，其特征在于，所述接入所述第五代移动通信网络，具体包括：
    重新接入到所述支持第五代移动通信网络的第一接入网设备。
  9. 根据权利要求1至7任一所述的方法，其特征在于，所述接入所述第五代移动通信网络，具体包括：
    搜索并接入到支持所述第五代移动通信网络的第三接入网设备。
  10. 一种无线通信装置，其特征在于，包括：
    接收单元，用于接收演进分组系统EPS回落指示消息；
    处理单元，用于从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行互联网协议多媒体子系统IMS语音通信；
    所述接收单元，还用于接收无线资源控制连接释放消息，所述无线资源控制连接释放消息不携带重定向指示信息；
    所述处理单元，用于在完成所述IMS语音通信后，在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络。
  11. 根据权利要求10所述的无线通信装置，其特征在于，所述处理单元，具体用于：
    在发送再见BYE消息并接收到好的200(OK)消息后，或者，在接收再见BYE消息并发送好的200(OK)消息后，在接收到无线资源控制连接释放消息时，接入到所述第五代移动通信网络；其中，所述再见BYE消息和所述好的200(OK)消息为会话初始协议中的消息，所述再见BYE消息用于指示所述IMS语音通信结束，所述好的200(OK)消息用于响应所述再见BYE消息。
  12. 根据权利要求10或11所述的无线通信装置，其特征在于，所述处理单元，具体用于：
    在接收到无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息前不存在所述IMS语音的服务质量流时，接入到所述第五代移动通信网络。
  13. 根据权利要求10或11所述的无线通信装置，其特征在于，所述处理单元，具体用于：
    在接收到无线资源控制连接释放消息，且在接收到所述演进分组系统EPS回落指示消息之前的预设时长内未上报测量报告时，接入到所述第五代移动通信网络。
  14. 根据权利要求13所述的无线通信装置，其特征在于，所述测量报告指的是包括B1事件，或者，B2事件，或者，B1事件和B2事件的测量报告。
  15. 根据权利要求10或14所述的无线通信装置，其特征在于，所述EPS回落指示消息为来自新无线命令的移动性消息。
  16. 根据权利要求10或14所述的无线通信装置，其特征在于，所述EPS回落指示消息为无线资源控制释放消息。
  17. 根据权利要求10或16所述的无线通信装置，其特征在于，所述处理单元，具体用于：
    重新接入到所述支持第五代移动通信网络的第一接入网设备。
  18. 根据权利要求10或16所述的无线通信装置，其特征在于，所述处理单元，具体用于：
    搜索并接入到支持第五代移动通信网络的第三接入网设备。
  19. 一种无线通信装置，其特征在于，该无线通信装置可以为终端设备或用于终端设备的装置，该无线通信装置包括处理器以及收发器，其中，所述处理器与所述收发器相连。
  20. 一种通信系统，其特征在于，所述通信系统包括无线通信装置和第一接入网设备，其中：
    所述第一接入网设备，用于向所述无线通信装置发送回落指示消息；
    所述无线通信装置，用于接收所述第一接入网设备发送的回落指示消息，并根据所述回落指示消息从支持第五代移动通信网络的第一接入网设备切换到支持第四代移动通信网络的第二接入网设备，进行IMS语音通信；
    所述无线通信装置，还用于在完成所述IMS语音通信时，接入到所述第五代移动通信网络。
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113873606A (zh) * 2021-10-27 2021-12-31 中国电信股份有限公司 终端自主返回网络的方法、终端以及存储介质
CN114501413A (zh) * 2022-03-08 2022-05-13 北京小米移动软件有限公司 紧急呼叫方法、装置、用户设备及计算机可读存储介质
CN115250441A (zh) * 2021-04-28 2022-10-28 中国移动通信集团河北有限公司 一种语音回落时延信息的确定方法、装置、设备及介质
WO2023061324A1 (zh) * 2021-10-11 2023-04-20 展讯通信（上海）有限公司 数据处理方法、装置、终端设备以及存储介质

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115696230B (zh) * 2022-12-13 2023-05-02 荣耀终端有限公司 通话测试方法、电子设备及计算机存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105050147A (zh) * 2015-06-30 2015-11-11 中兴通讯股份有限公司 一种切换过程中语音回落的方法和装置
CN105338584A (zh) * 2015-09-29 2016-02-17 中国联合网络通信集团有限公司 一种返回lte网络的方法及装置
CN107172067A (zh) * 2017-06-14 2017-09-15 北京小米移动软件有限公司 一种通话方法、装置和设备
CN109819481A (zh) * 2017-11-20 2019-05-28 华为技术有限公司 一种网络切换方法及会话管理网元

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108696871B (zh) * 2017-02-28 2021-09-24 中国移动通信集团设计院有限公司 语音呼叫方法及装置
CN109548093B (zh) * 2017-08-02 2021-02-12 中兴通讯股份有限公司 网络切换的方法、装置及系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105050147A (zh) * 2015-06-30 2015-11-11 中兴通讯股份有限公司 一种切换过程中语音回落的方法和装置
CN105338584A (zh) * 2015-09-29 2016-02-17 中国联合网络通信集团有限公司 一种返回lte网络的方法及装置
CN107172067A (zh) * 2017-06-14 2017-09-15 北京小米移动软件有限公司 一种通话方法、装置和设备
CN109819481A (zh) * 2017-11-20 2019-05-28 华为技术有限公司 一种网络切换方法及会话管理网元

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OPPO, CATR, CHINA TELECOM, CHINA UNICOM: "Discussion for returning back to NR in case of handover for voice", 3GPP DRAFT; S2-176976 RETURNING BACK TO NR IN CASE OF HANDOVER FOR VOICE -DP, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. SA WG2, no. Ljubljana, Slovenia; 20171023 - 20171027, 17 October 2017 (2017-10-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051359672 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115250441A (zh) * 2021-04-28 2022-10-28 中国移动通信集团河北有限公司 一种语音回落时延信息的确定方法、装置、设备及介质
CN115250441B (zh) * 2021-04-28 2023-08-15 中国移动通信集团河北有限公司 一种语音回落时延信息的确定方法、装置、设备及介质
WO2023061324A1 (zh) * 2021-10-11 2023-04-20 展讯通信（上海）有限公司 数据处理方法、装置、终端设备以及存储介质
CN113873606A (zh) * 2021-10-27 2021-12-31 中国电信股份有限公司 终端自主返回网络的方法、终端以及存储介质
CN114501413A (zh) * 2022-03-08 2022-05-13 北京小米移动软件有限公司 紧急呼叫方法、装置、用户设备及计算机可读存储介质

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