WO2023015474A1 - Procédé pour appareil de communication sans fil, et appareil, support d'enregistrement et système de puce - Google Patents

Procédé pour appareil de communication sans fil, et appareil, support d'enregistrement et système de puce Download PDF

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Publication number
WO2023015474A1
WO2023015474A1 PCT/CN2021/112001 CN2021112001W WO2023015474A1 WO 2023015474 A1 WO2023015474 A1 WO 2023015474A1 CN 2021112001 W CN2021112001 W CN 2021112001W WO 2023015474 A1 WO2023015474 A1 WO 2023015474A1
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WIPO (PCT)
Prior art keywords
communication system
message
communication
wireless communication
voice service
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PCT/CN2021/112001
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English (en)
Chinese (zh)
Inventor
葛百章
姚琴波
贾国才
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华为技术有限公司
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Priority to CN202180007104.3A priority Critical patent/CN115968565A/zh
Priority to PCT/CN2021/112001 priority patent/WO2023015474A1/fr
Publication of WO2023015474A1 publication Critical patent/WO2023015474A1/fr

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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

Definitions

  • the present application relates to the technical field of mobile communication, and in particular to a method, device, storage medium and chip system for a wireless communication device.
  • the 3rd generation partnership project (3rd generation partnership project, 3GPP) has released independent (standalone, SA) networking and non- Two 5G standards for independent (non-standalone, NSA) networking.
  • SA standalone
  • NSA non-standalone
  • 5G SA provides corresponding audio and video call services.
  • 5G SA no longer supports the interoperability with the traditional packet switched (circuited switched, CS) domain, but provides audio through the connected network interconnection protocol multimedia subsystem (internet protocol multimedia subsystem, IMS).
  • IMS Internet protocol multimedia subsystem
  • Video call service The solution for terminal equipment to obtain audio and video call services through IMS in 5G SA is also called IMS-based 5G new wireless voice solution (voice on new radio, VoNR).
  • VoNR call setup time is short, and data services can still be transmitted at high speed, which can give users a better experience. It is the target voice solution in the future.
  • VoNR voice on long term evolution
  • VoIP voice on long term evolution
  • both the network device and the terminal device support VoNR, under certain conditions, such as the signal of the 5G communication system is weak, the terminal device will fail to make a voice call through VoNR.
  • both the network device and the terminal device support VoLTE, under certain conditions, such as the signal of the 4G communication system is weak, the voice call of the terminal device through VoLTE will fail.
  • the present application provides a method, device, storage medium, and chip system for a wireless communication device, which is used for autonomous communication if the wireless communication device does not receive a system fallback message when the wireless communication device has a voice service requirement in the first communication system. Falling back to the second communication system for voice services, so that the user's voice service requirements can be guaranteed.
  • the wireless communication device may be a wireless communication device, or may be a part of the wireless communication device, such as an integrated circuit product such as a system chip or a communication chip.
  • a wireless communication device may be a computer device supporting a wireless communication function.
  • the wireless communication device may be a terminal such as a smart phone.
  • a system chip can also be called a system on chip (system on chip, SoC), or simply a SoC chip.
  • Communication chips may include baseband processing chips and radio frequency processing chips.
  • Baseband processing chips are also sometimes referred to as modems or baseband chips.
  • RF processing chips are sometimes also referred to as RF transceivers or RF chips.
  • part or all of the chips in the communication chip can be integrated inside 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 embodiment of the present application provides a method for a wireless communication device.
  • the wireless communication device detects the voice service demand of the first communication system, it monitors whether the system receives the voice service within the first duration.
  • a fallback message wherein the first communication system does not support voice services, and the system fallback message is used to indicate a fallback from the first communication system to another communication system. If the system fallback message is not received within the first time period, autonomously fall back to the second communication system, and perform voice services in the second communication system, where the second communication system is different from the first communication system.
  • the system fallback message if it is not received within the first period of time, it can automatically fall back to the second communication system and perform voice services in the second communication system, thereby ensuring the user's voice service needs.
  • the wireless communication device After the wireless communication device detects the demand for the voice service of the first communication system, it starts a timer, and monitors whether a system fallback message is received before the timer expires; the set duration of the timer is First time. In this way, it is possible to monitor whether the first duration is reached by setting a timer.
  • the wireless communication device may also fall back to other communications according to the system fallback message if it receives a system fallback message within the first time period. system, and conduct voice services in other communication systems.
  • the system fallback message in the case that the system fallback message is not missed on the network device side, it can fall back to other communication systems based on the system fallback message as much as possible, and then can obtain the benefits of fallback based on the system fallback message: "Reduce the operation on the wireless communication device side , more easily and quickly.”
  • the system fallback message is a handover message. In this way, it can be more compatible with the existing technology.
  • the system fallback message is a redirection message. In this way, it can be more compatible with the existing technology.
  • the wireless communication device may be the calling party or the called party. For example, in a possible implementation manner, the wireless communication device determines to detect the voice service demand of the first communication system when the following content is met: The communication system sends a session invitation message, and the session invitation message is used to initiate a voice service.
  • the wireless communication device determines to detect the voice service demand of the first communication system when the following content is met: receiving a paging message in the first communication system, and the paging message is used for Instruct other wireless communication devices to initiate voice services to the wireless communication device.
  • the length of the first duration is related to at least one of the following: whether the voice service belongs to an emergency call service; or, whether the voice service belongs to a calling service.
  • the set duration of the timer may be shorter, for example, shorter than the set duration of the timer corresponding to the non-emergency call service. In this way, the emergency call can be connected faster, so that help can be provided to the user faster.
  • the set duration of the timer may be shorter, for example, shorter than the set duration of the timer corresponding to the called service. In this way, the call of the calling party can be connected faster, so that the voice service can be provided to the user faster.
  • the wireless communication device After the wireless communication device detects the demand for the voice service of the first communication system and does not receive a system fallback message within a first time period, it sends the first message.
  • the first message Used to indicate an abnormality in communication. In this way, it is possible to report the detected "system fallback message missing from the network device side", so that the fault can be repaired as soon as possible in the event of a fault.
  • the first communication system is a 5G communication system
  • the second communication system is a 4G communication system, a 3G communication system or a 2G communication system
  • other communication systems are a 4G communication system, 3G communication system or 2G communication system.
  • the first communication system is a 4G communication system
  • the second communication system is a 3G communication system or a 2G communication system
  • the other communication systems are a 3G communication system or a 2G communication system.
  • a wireless communication device including a communication unit and a processing unit, so as to implement the first aspect or any implementation manner of the first aspect.
  • the communication unit is used to perform functions related to transmission and reception.
  • the communication unit includes a receiving unit and a sending unit.
  • the wireless communication device is a communication chip
  • the processing unit may be one or more processors or processor cores
  • the communication unit may be an input/output circuit or port of the communication chip.
  • the communication unit may be a transmitter and a receiver, or the communication unit may be a transmitter and a receiver.
  • the wireless communication device further includes various modules that can be used to implement the foregoing first aspect or any implementation manner of the first aspect.
  • a wireless communication device including a processor and a memory.
  • a transceiver is also included, the memory is used to store computer programs or instructions, the processor is used to call and run the computer programs or instructions from the memory, and when the processor executes the computer programs or instructions in the memory, the The wireless communication device implements the first aspect or any implementation manner of the first aspect.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory may be separated from the processor.
  • the transceiver may include a transmitter (transmitter) and a receiver (receiver).
  • a wireless communication device including a processor.
  • the processor is coupled with the memory and can be used to implement the first aspect or any implementation manner of the first aspect.
  • the wireless communication device further includes a memory.
  • the wireless communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication interface may be a transceiver, or an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system wait.
  • a processor may also be embodied as processing circuitry or logic circuitry.
  • a system in a fifth aspect, includes the foregoing wireless communication device and network equipment.
  • a computer program product includes: a computer program (also referred to as code, or an instruction), which, when the computer program is run, causes the computer to perform any of the above-mentioned first aspect or the first aspect.
  • a computer program also referred to as code, or an instruction
  • a computer-readable storage medium stores a computer program (also referred to as code, or instruction) which, when run on a computer, causes the computer to perform the above-mentioned first aspect or the first Any embodiment of the aspect.
  • a computer program also referred to as code, or instruction
  • a chip system may include a processor.
  • the processor is coupled with the memory and can be used to implement the first aspect or any implementation manner of the first aspect.
  • the chip system further includes a memory.
  • Memory used to store computer programs (also called code, or instructions).
  • the processor is configured to call and run a computer program from the memory, so that the device equipped with the system-on-a-chip executes the first aspect or any one of the implementation manners of the first aspect.
  • a processing device including: an interface circuit and a processing circuit.
  • Interface circuitry may include input circuitry and output circuitry.
  • the processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, so that the first aspect or any implementation manner of the first aspect is realized.
  • the above-mentioned processing device may be a chip
  • the input circuit may be an input pin
  • the output circuit may be an output pin
  • the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits.
  • the input signal received by the input circuit may be received and input by, for example but not limited to, the receiver
  • the output signal of the output circuit may be, for example but not limited to, output to the transmitter and transmitted by the transmitter
  • the circuit may be the same circuit, which is used as an input circuit and an output circuit respectively at different times.
  • the present application does not limit the specific implementation manners of the processor and various circuits.
  • the first wireless communication device when the wireless communication device is a first wireless communication device, the first wireless communication device may be a terminal such as a smart phone, or may be a radio access network device such as a base station.
  • the interface circuit may be a radio frequency processing chip in the first wireless communication device, and the processing circuit may be a baseband processing chip in the first wireless communication device.
  • the wireless communication device may be a part of the first wireless communication device, such as an integrated circuit product such as a system chip or a communication chip.
  • the interface circuit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system.
  • the processing circuitry may be logic circuitry on the chip.
  • FIG. 1a is a schematic structural diagram of a wireless communication system provided by an embodiment of the present application.
  • FIG. 1b is a schematic structural diagram of another wireless communication system provided by an embodiment of the present application.
  • Fig. 1c is a schematic structural diagram of a wireless communication device provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for a wireless communication device provided in an embodiment of the present application
  • FIG. 3a is a flowchart of a method for initiating a voice service when the wireless communication device provided by the embodiment of the present application is the calling party;
  • FIG. 3b is a flowchart of a method for initiating a voice service when the wireless communication device provided by the embodiment of the present application is the called party;
  • Fig. 4a is a schematic flowchart of a method for a wireless communication device to fall back from a first communication system to a second communication system according to an embodiment of the present application;
  • Fig. 4b is a schematic flowchart of a method for a wireless communication device to fall back from a first communication system to another communication system according to an embodiment of the present application;
  • FIG. 5 is a schematic flowchart of a method for a wireless communication device provided in an embodiment of the present application
  • FIG. 6 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • the embodiments of the present application may be applicable to wireless communication systems.
  • the wireless communication system may comply with the wireless communication standard of the third generation partnership project (3GPP), and may also comply with other wireless communication standards, such as the 802 standard of the Institute of Electrical and Electronics Engineers (IEEE).
  • 3GPP third generation partnership project
  • IEEE Institute of Electrical and Electronics Engineers
  • a family of wireless communication standards such as 802.11, 802.15, or 802.20.
  • LTE includes Time Division Duplex LTE (LTE TDD, or TD-LTE) and Frequency Division Duplex LTE (LTE FDD).
  • the TD-SCDMA and WCDMA systems are the Universal Mobile Telecommunications System (UMTS) of 3G mobile phone technology.
  • the network structure of UMTS can be divided into UMTS Terrestrial Radio Access Network (UMTS Terrestrial Radio Access Network, UTRAN) and core network (Core Network, CN).
  • UMTS Terrestrial Radio Access Network UTRAN
  • Core Network Core Network
  • RAN Radio Access Network
  • RNS Radio Network Subsystem
  • each RNS includes a radio network controller (Radio Network Controller, RNC) and One or more Node Bs (base stations).
  • RNC Radio Network Controller
  • Node B is a node with wireless transceiver function, which supports the air interface with wireless terminal equipment within the range of the cell and provides services for the cell.
  • the communication between the Node B and the RNC is carried out through the Iub interface, and the RNCs can be interconnected through an interface including a direct physical connection or a virtual network using any suitable transmission network.
  • the 2G communication system generally includes GSM, CDMA, GPRS, EDGE and IS-95CDMA.
  • 3G communication systems usually include TD-SCDMA, WCDMA, CDMA2000 and CDMA2000 upgrades.
  • 4G communication systems include LTE.
  • the 5G communication system includes NR.
  • the terminal device can also support multiple communication systems, and thus roaming in the multiple communication systems can be realized.
  • the devices in the communication system to which the embodiments of the present application are applicable can be divided into: devices providing wireless network services and devices using wireless network services.
  • a network device includes an access network (access network, AN) device, such as a base station (for example, an access point), which may refer to a device in an access network that communicates with a wireless terminal device through one or more cells through an air interface.
  • AN access network
  • the base station can be used to convert received over-the-air frames to and from Internet Protocol (IP) packets and act as a router between the terminal device and the rest of the access network, which can include an IP network.
  • IP Internet Protocol
  • the RSU can be a fixed infrastructure entity supporting V2X applications, and can exchange messages with other entities supporting V2X applications.
  • the network device can also coordinate the attribute management of the air interface.
  • the network equipment may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in the LTE system or long term evolution-advanced (LTE-A), or may also include a fifth generation mobile
  • the next generation node B (next generation node B, gNB) in the communication technology (the 5 th generation, 5G) new radio (new radio, NR) system may also include the cloud access network (cloud radio access network, Cloud RAN)
  • the embodiment of the present application does not limit the centralized unit (centralized unit, CU) and distributed unit (distributed unit, DU) in the system.
  • a device using a wireless network service may be referred to as a terminal device (terminal) or a terminal device for short.
  • Terminal devices include devices that provide voice and/or data connectivity to a user, and may include, for example, handheld devices with wireless connectivity, or processing devices connected to a wireless modem.
  • the terminal device can communicate with the core network via a radio access network (radio access network, RAN), and exchange voice and/or data with the RAN.
  • radio access network radio access network
  • the terminal device may include user equipment (user equipment, UE), wireless terminal device, mobile terminal device, device-to-device communication (device-to-device, D2D) terminal device, V2X terminal device, machine-to-machine/machine-type communication ( machine-to-machine/machine-type communications, M2M/MTC) terminal equipment, internet of things (IoT) terminal equipment, subscriber unit, subscriber station, mobile station , remote station (remote station), access point (access point, AP), remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user agent), Or user equipment (user device), etc.
  • IoT internet of things
  • it may include mobile phones (or “cellular” phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer built-in mobile devices, and the like.
  • PCS personal communication service
  • cordless telephone cordless telephone
  • session initiation protocol session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • constrained devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, etc.
  • it includes barcodes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning system (global positioning system, GPS), laser scanners and other information sensing devices.
  • Fig. 1a is a schematic structural diagram of a wireless communication system provided by an embodiment of the present application.
  • a wireless communication system includes a terminal device and a base station. According to different transmission directions, a transmission link from a terminal device to a base station is marked as an uplink (uplink, UL), and a transmission link from a base station to a terminal device is marked as a downlink (downlink, DL).
  • uplink uplink
  • UL uplink
  • downlink downlink
  • data transmission in the uplink may be abbreviated as uplink data transmission or uplink transmission
  • data transmission in the downlink may be abbreviated as downlink data transmission or downlink transmission.
  • the base station can provide communication coverage for a specific geographical area through an integrated or external antenna device.
  • One or more terminal devices within the communication coverage of the base station can access the base station.
  • One base station can manage one or more cells. Each cell has an identification (identification), which is also called a cell identity (cell ID). From the perspective of radio resources, a cell is a combination of downlink radio resources and its paired uplink radio resources (not necessary).
  • Terminal equipment and base stations should know the predefined configuration of the wireless communication system, including the radio access technology (radio access technology, RAT) supported by the system and the wireless resource configuration specified by the system, such as the basic configuration of the radio frequency band and carrier.
  • the carrier is a frequency range that complies with system regulations. This frequency range can be jointly determined by the center frequency of the carrier (referred to as the carrier frequency) and the bandwidth of the carrier.
  • the predefined configurations of these systems can be used as part of the standard protocol of the wireless communication system, or determined through the interaction between the terminal equipment and the base station.
  • the content of relevant standard protocols may be pre-stored in the memory of terminal equipment and base stations, or embodied as hardware circuits or software codes of terminal equipment and base stations.
  • the terminal equipment and the base station support one or more of the same RAT, such as 5G NR, 4G LTE, or the RAT of the future evolution system.
  • the terminal device and the base station use the same air interface parameters, coding scheme, modulation scheme, etc., and communicate with each other based on the wireless resources specified by the system.
  • Fig. 1b exemplarily shows a schematic diagram of another communication system provided by the embodiment of the present application.
  • the communication system may include one or more wireless communication devices.
  • the wireless communication device is used as a terminal The device is shown as an example, such as the terminal device 100 and the terminal device 104 shown in FIG. 1b.
  • the wireless communication apparatus mentioned in the embodiment of the present application may be a terminal device, or a chip provided in the terminal device.
  • Terminal equipment can access various communication systems, and a communication system usually includes access network equipment and core network equipment.
  • access network (radio access network, RAN) equipment mainly responsible for wireless resource management on the air interface side, quality of service (quality of service, QoS) management, data compression and encryption and other functions.
  • Access network equipment may include base stations in various forms, for example: macro base stations, micro base stations (also called small stations), relay stations, access points, and so on.
  • Core network equipment is used to provide user connections, manage users, and carry out services.
  • the establishment of a user connection includes functions such as mobility management (mobile management, MM) and paging (paging).
  • User management includes user description, Qos, and security (corresponding security measures provided by the authentication center include security management of mobile services and security processing of external network access).
  • Bearer connections include external public switched telephone network (public switched telephone network, PSTN), external circuit data network and packet data network, Internet (Internet) and so on.
  • the communication system architecture may include a 5G communication system 103.
  • the 5G communication system 103 includes: a 5G access network device 101, a 5G core network (5G core network, 5GC) device 102.
  • the 5G access network device 101 is connected to to the 5GC device 102 .
  • the 5G access network device 101 may be a next generation base station (next generation NodeB, gNB). As shown in Figure 1b, the gNB can be connected to the terminal device 100, and communicate with the terminal device 100 using new radio (new radio, NR) access technology, that is, the gNB and the terminal device 100 communicate through the NR link .
  • new radio new radio
  • the network element in the 5GC device is a functional virtual unit, which may include but not limited to: a unit for access and mobility management function (AMF), a unit for session management function (session management function) , SMF), network element for unified data management (unified data management, UDM) and so on.
  • AMF access and mobility management function
  • SMF session management function
  • UDM network element for unified data management
  • an internet protocol-based multimedia subsystem (Internet Protocol Multimedia subsystem, IMS) may be provided.
  • IMS is used to manage the IP data packets packaged into multimedia data such as voice and video, distinguish the signaling part and multimedia data part of these IP data packets, and transmit the IP data packets between the terminal device 100 and the called end of its call.
  • the multimedia data part so as to provide audio and video services for the terminal device 100 .
  • the IMS may mainly include a call session control function entity (call session control function, CSCF) and a home subscriber server (home subscriber server, HSS).
  • CSCF call session control function
  • HSS home subscriber server
  • the CSCF is used to control the signaling, authentication, and cooperation with other network entities to control the session during the multimedia call session.
  • HSS is used to manage user data.
  • VoNR refers to the 5G communication system 103 carrying call data during a call.
  • the terminal device 100 calling the terminal device 104 through VoNR means that the terminal device 100 requests the control plane signaling (IMS signaling) and user plane data involved in the communication between the terminal device 100 and the terminal device 104 through the 5G communication system 103 and the IMS300 (IMS traffic) are packaged into IP packets and transmitted.
  • IMS signaling control plane signaling
  • IMS traffic IMS300
  • the service data and voice data involved in the terminal device 100 are both transmitted in the form of IP data packets.
  • the communication system architecture may also include a 4G communication system 113.
  • the 4G communication system 113 includes: a 4G access network device 111 and a 4G core network (evolved packet core, EPC) 112.
  • the 4G access network device 111 Connect to EPC device 112 .
  • the 4G access network device 111 may be an evolved base station (evolved Node B, eNB). As shown in FIG. 1 b , the terminal device 100 may be located within the signal coverage of the 4G access network device 111 . The terminal device 100 may be connected to the 4G access network device 111, and communicate with the 4G access network device 111 through an LTE link.
  • eNB evolved Node B
  • the EPC device 112 mainly includes the following network elements: mobility management entity (mobility management entity, MME), serving gateway (serving gateway, SGW), packet data network gateway (packet data network gateway, PGW), home subscriber server (home subscriber server, HSS) and application server, etc.
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • HSS home subscriber server
  • the main functions of the MME include access control, mobility management, attachment and detachment, session management (such as establishment, modification and release of bearers), etc.
  • the SGW is mainly used for routing and forwarding of data packets.
  • the main functions of the PGW include user-based packet filtering, lawful interception, and IP address assignment.
  • the HSS is used to store user subscription information, user subscription data, and location information of mobile users.
  • the 4G communication system can support VoLTE voice services.
  • VoLTE refers to the 4G communication system 113 carrying call data during a call.
  • the terminal device calling the terminal device 104 through VoLTE means that the terminal device 100 requests the control plane signaling (IMS signaling) and user plane data (IMS signaling) and user plane data ( IMS traffic) are packaged into IP packets and transmitted.
  • IMS signaling control plane signaling
  • IMS signaling user plane data
  • IMS traffic user plane data
  • the service data and voice data involved in the terminal device 100 are both transmitted in the form of IP data packets.
  • the communication system architecture may also include a 2G/3G communication system 123 .
  • the 2G/3G communication system 123 may include: 2G/3G access network equipment 121 and 2G/3G core network equipment 122 .
  • 2G/3G in this embodiment of the present application refers to 2G and/or 3G, wherein the 2G communication system includes 2G core network equipment and 2G access network equipment, and the 3G communication system includes 3G core network equipment and 3G access network equipment.
  • the 2G access network equipment may be a base transceiver station (base transceiver station, BTS) and a base station controller (base station controller, BSC).
  • the 3G access network device may be a Node B (NodeB) or a base station, or a radio network controller (radio network controller, RNC).
  • the 2G/3G core network device 122 may be a mobile switching center (Mobile Switching Center, MSC), a base station controller (base station controller, BSC), etc.
  • the terminal device 100 can be connected to the 2G/3G access network device 121, and communicate with the 2G/3G access network device 121 through the global system for mobile communications (GSM), universal mobile telecommunications system (universal mobile telecommunications) system) and other links communicate with each other.
  • GSM global system for mobile communications
  • universal mobile telecommunications system universal mobile telecommunications
  • the 2G/3G core network equipment 122 includes a CS domain, and the 2G/3G communication system 123 can provide audio and video services on CS sessions, that is, the 2G/3G communication system 123 supports voice solutions based on the CS domain.
  • the voice solution based on the CS domain refers to establishing an exclusive channel between two or more terminal devices through the traditional CS domain, and using this channel for audio and video communication.
  • the CS (Circuit Switch) service involved in the embodiment of the present application means a circuit switched service.
  • CS is that different users exclusively occupy the resources allocated to them.
  • CS services mainly include some voice services, such as 12.2K voice services, 64K video phone services, and so on. For example, taking the voice service as an example, the channel is monopolized until the call ends and the channel is released for use by other users.
  • each network element is only exemplary, and not all functions of each network element are required when applied in the embodiment of the present application.
  • FIG. 1c is a schematic structural diagram of a wireless communication device provided by an embodiment of the present application.
  • the wireless communication apparatus may be the terminal device in the embodiment of the present application, for example, it may be the terminal device in FIG. 1a or FIG. 1b.
  • the wireless communication device may include a processing circuit and an interface circuit.
  • Interface circuitry may include input circuitry and output circuitry.
  • the processing circuit is used to receive signals through the input circuit and transmit signals through the output circuit, so that the related methods of Fig. 2, Fig. 3a, Fig. 3b, Fig. 4a, Fig. 4b or Fig. 5 described below are implemented.
  • the processing circuit may execute the following S201, S202, S203, etc. through the control interface circuit.
  • the interface circuit may also be a radio frequency processing chip in the wireless communication device, and the processing circuit may be a baseband processing chip in the wireless communication device.
  • the wireless communication device may be a part of a wireless communication device, such as an integrated circuit product such as a system chip or a communication chip.
  • the interface circuit may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system.
  • the processing circuitry may be logic circuitry on the chip.
  • the processing circuit in the embodiment of the present application may also be a processor or a part of modules or units in the processor, and the interface circuit may also be a radio frequency channel or a part of devices in the radio frequency channel.
  • the processor is used to control the radio frequency channel, so that the related methods in Fig. 2, Fig. 3a, Fig. 3b, Fig. 4a, Fig. 4b or Fig. 5 described below are implemented.
  • the wireless communication device may include multiple components, for example: application subsystem, memory (memory), mass storage (massive storage), baseband subsystem, radio frequency integrated circuit (radio frequency integrated circuit, RFIC) , RF front end (radio frequency front end, RFFE) device, and antenna (antenna, ANT). These components can be coupled by various interconnecting buses or other electrical connections.
  • application subsystem memory (memory), mass storage (massive storage), baseband subsystem, radio frequency integrated circuit (radio frequency integrated circuit, RFIC) , RF front end (radio frequency front end, RFFE) device, and antenna (antenna, ANT).
  • RFIC radio frequency integrated circuit
  • RFFE radio frequency front end
  • antenna antenna
  • the application subsystem in FIG. 1c may be the processor 110 in FIG. 1c , or a module in the processor 110 .
  • ANT_1 represents the first antenna
  • ANT_N represents the Nth antenna
  • N is a positive integer greater than 1.
  • Tx represents the sending path
  • Rx represents the receiving path
  • different numbers represent different paths.
  • Each path can represent a signal processing channel.
  • FBRx represents a feedback receiving path
  • PRx represents a main receiving path
  • DRx represents a diversity receiving path.
  • HB means high frequency
  • LB means low frequency, both refer to the relative high and low frequencies.
  • BB means baseband.
  • the application subsystem can be used as the main control system or the main computing system of the communication device, used to run the main operating system and application programs, manage the software and hardware resources of the entire communication device, and provide the user with a user interface.
  • the application subsystem may also include driver software related to other subsystems (eg, baseband subsystem).
  • An application subsystem may include one or more processors.
  • the multiple processors may be multiple processors of the same type, or may include a combination of multiple types of processors.
  • the processor may be a general-purpose processor or a processor designed for a specific field.
  • the processor may be a central processing unit (center processing unit, CPU), a digital signal processor (digital signal processor, DSP), or a microcontroller (micro control unit, MCU).
  • the processor can also be a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processing, ISP), an audio signal processor (audio signal processor, ASP), and an artificial intelligence (artificial intelligence, AI) Apply a specially designed AI processor.
  • AI processors include but are not limited to neural network processing unit (NPU), tensor processing unit (TPU) and processors called AI engines.
  • radio frequency integrated circuits including RFIC 1, and one or more optional RFIC 2 and radio frequency front-end devices can together form a radio frequency subsystem.
  • the RF subsystem can also be divided into RF receive path (RF receive path) and RF transmit path (RF transmit path).
  • the radio frequency receiving channel can receive the radio frequency signal through the antenna, process the radio frequency signal (such as amplifying, filtering and down-converting) to obtain the baseband signal, and transmit it to the baseband subsystem.
  • the radio frequency transmission channel can receive the baseband signal from the baseband subsystem, process the baseband signal (such as up-converting, amplifying and filtering) to obtain a radio frequency signal, and finally radiate the radio frequency signal into space through the antenna.
  • Radio frequency integrated circuits may be referred to as radio frequency processing chips or radio frequency chips.
  • the radio frequency subsystem may include an antenna switch, an antenna tuner, a low noise amplifier (low noise amplifier, LNA), a power amplifier (power amplifier, PA), a mixer (mixer), a local oscillator (local oscillator, LO ), filters and other electronic devices, these electronic devices can be integrated into one or more chips as required.
  • Radio frequency integrated circuits may be referred to as radio frequency processing chips or radio frequency chips.
  • the RF front-end device can also be a stand-alone chip. RF chips are sometimes called receivers, transmitters, transceivers or transceivers. With the evolution of technology, the antenna can sometimes be considered as a part of the radio frequency subsystem and can be integrated into the chip of the radio frequency subsystem.
  • radio frequency subsystem can also use different devices or different integration methods based on power consumption and performance requirements. For example, if some devices belonging to the radio frequency front end are integrated into the radio frequency chip, even the antenna and the radio frequency front end devices are integrated into the radio frequency chip, the radio frequency chip may also be called a radio frequency antenna module or an antenna module.
  • the baseband subsystem mainly completes the processing of baseband signals.
  • the baseband subsystem can extract useful information or data bits from baseband signals, or convert information or data bits into baseband signals to be transmitted. These information or data bits may be data representing user data such as voice, text, video, or control information.
  • the baseband subsystem can implement signal processing operations such as modulation and demodulation, encoding and decoding.
  • signal processing operations are not exactly the same.
  • the radio frequency signal is usually an analog signal
  • the signal processed by the baseband subsystem is mainly a digital signal
  • an analog-to-digital conversion device is also required in the communication device.
  • the analog-to-digital conversion device may be set in the baseband subsystem, or may be set in the radio frequency subsystem.
  • Analog to digital conversion devices include an analog to digital converter (analog to digital converter, ADC) that converts an analog signal into a digital signal, and a digital to analog converter (digital to analog converter, DAC) that converts a digital signal to an analog signal.
  • the baseband subsystem may also include one or more processors.
  • the baseband subsystem may also include one or more hardware accelerators (hardware accelerator, HAC).
  • Hardware accelerators can be used to specifically complete some sub-functions with high processing overhead, such as assembly and analysis of data packets, encryption and decryption of data packets, etc.
  • These sub-functions can also be implemented by using a general-purpose processor, but due to performance or cost considerations, it may be more appropriate to use a hardware accelerator.
  • the hardware accelerator is mainly implemented by an application specified integrated circuit (ASIC).
  • ASIC application specified integrated circuit
  • one or more relatively simple processors, such as MCUs may also be included in the hardware accelerator.
  • the baseband subsystem and the radio frequency subsystem together form a communication subsystem, which provides a wireless communication function for a communication device.
  • the baseband subsystem is responsible for managing the hardware and software resources of the communication subsystem, and can configure the working parameters of the radio frequency subsystem.
  • the processor of the baseband subsystem can run a subsystem operating system of the communication subsystem, which is usually an embedded operating system or a real time operating system (real time operating system), such as the VxWorks operating system or the QuRT system of Qualcomm.
  • the baseband subsystem can be integrated into one or more chips, which can be called baseband processing chips or baseband chips.
  • the baseband subsystem can be used as an independent chip, and the chip can be called a modem (modem) or a modem chip.
  • the baseband subsystem can be manufactured and sold in units of modem chips. Modem chips are sometimes called baseband processors or mobile processors.
  • the baseband subsystem can also be further integrated into a larger chip, and manufactured and sold in units of a larger chip. This larger chip can be called a system-on-a-chip, system-on-a-chip, or system-on-a-chip (SoC), or simply an SoC chip.
  • SoC system-on-a-chip
  • the software components of the baseband subsystem can be built into the hardware components of the chip before the chip leaves the factory, or can be imported into the hardware components of the chip from other non-volatile memories after the chip leaves the factory, or can be downloaded online through the network and update these software components.
  • the communication device also includes memory, such as memory and mass storage in FIG. 1c.
  • the application subsystem and the baseband subsystem may also include one or more buffers respectively.
  • the memory can be divided into volatile memory (volatile memory) and non-volatile memory (non-volatile memory, NVM).
  • Volatile memory refers to memory in which data stored inside will be lost when the power supply is interrupted.
  • volatile memory is mainly random access memory (random access memory, RAM), including static random access memory (static RAM, SRAM) and dynamic random access memory (dynamic RAM, DRAM).
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • Non-volatile memory refers to memory in which the data stored inside will not be lost even if the power supply is interrupted.
  • Non-volatile memories include read only memory (ROM), optical discs, magnetic disks, and various memories based on flash memory (flash memory) technology.
  • volatile memory can be used for memory and cache
  • non-volatile memory such as flash memory, can be used for large-capacity storage.
  • the voice service may be called a call
  • a call refers to a process in which one terminal device initiates a voice call request to another terminal device.
  • a terminal device that initiates a call is the calling terminal
  • another terminal device that receives the call is the called terminal.
  • the calling terminal and the called terminal can communicate, that is, data such as voice can be transmitted between the calling terminal and the called terminal, thereby providing multimedia services such as voice and video for users at both ends.
  • the calling terminal and the called terminal can use the International Mobile Subscriber Identification Number (IMSI) as the identification.
  • IMSI International Mobile Subscriber Identification Number
  • the voice solutions involved when the terminal device initiates a call may include, but not limited to: VoNR, IMS-based voice on long term evolution (VoLTE), CS domain-based voice solutions, and the like. Subsequent embodiments will describe in detail the specific implementation process of the above voice solution, which will not be repeated here.
  • the terminal device 100 in FIG. 1b is taken as an example for description by taking the wireless communication device.
  • the terminal device 100 may store user information.
  • the subscriber information may include an IMSI, and may be stored in a subscriber identity module (subscriber identity module, SIM) card of the terminal device.
  • SIM subscriber identity module
  • the wireless communication device can use the user information as an identity to initiate a call to other terminal equipment through various voice solutions, and perform audio and video communication after the other terminal equipment accepts the call.
  • the terminal device 100 can initiate a call to the terminal device 104 , and the terminal device 104 can also initiate a call to the terminal device 100 .
  • the terminal device 100 initiates a voice service under the 5G communication system (such as using 5G VoNR to call the terminal device 104), when the call fails, the terminal device 100 may receive a message from the network device side of the 5G communication system
  • a system fallback message (a system fallback message such as a handover message or a redirection message), the system fallback message may indicate switching from the current communication system to another communication system, such as a 4G communication system.
  • the terminal device 100 accesses the 4G communication system to continue voice services according to the system fallback message (such as using 4G VoLTE to call the terminal device 104). If the terminal device 100 fails to perform voice services in the 4G communication system, the terminal device 100 may receive a system fallback message (such as a handover message or a redirection message) from the network device side of the 4G communication system, and the system fallback message can be Indicates switching from the current communication system to other communication systems, such as 2G or 3G communication systems. Further, the terminal device 100 accesses the 2G or 3G communication system according to the system fallback message and continues to call the terminal device 104 .
  • a system fallback message such as a handover message or a redirection message
  • the terminal device 100 switches from one communication system to another communication system (such as switching from a 5G communication system to a 4G communication system; another example, switching from a 4G communication system to a new 2G or 3G communication system)) , need to switch according to the received system fallback message from the network device.
  • switching based on the system fallback message such as switching from a 5G communication system to a 4G communication system, part of the information involved in connecting the terminal device to the 4G communication system can be directly sent or exchanged by the EPC device to the 5GC device, which can reduce the terminal device 100. The operation is easier and faster.
  • FIG. 2 exemplarily shows a schematic flowchart of a method for a wireless communication device provided by an embodiment of the present application.
  • the wireless communication device in the embodiment of the present application may be a chip or a terminal device (for example, it may be the terminal device in the above-mentioned FIG. 1a and FIG. 1b , or it may be the wireless communication device in the above-mentioned FIG. 1c ).
  • the chip may be a baseband chip, or a communication system chip, or a set of chips including a baseband chip and a radio frequency chip.
  • the method includes:
  • the wireless communication device After the wireless communication device detects the demand for the voice service of the first communication system, it monitors whether a system fallback message is received within the first time period, wherein the first communication system does not support the voice service, and the system fallback message is used to indicate from The first communication system falls back to the other communication systems.
  • the system fallback message may be a handover instruction, and the English of handover may be written as handover.
  • the system fallback message may be a redirection message, and redirection may be written as redirection in English. Whether the delivered system fallback message is a handover message or a redirection message may be determined by the network device side.
  • the wireless communication device may disconnect from the first communication system after being connected to the second communication system. This method does not involve the release of air interface resources and is highly efficient.
  • the wireless communication device may disconnect from the first communication system and reconnect to the second communication system.
  • system fallback message may have other names in the future or in other standards, and this embodiment of the present application only uses a handover message and a redirection message for illustration.
  • the wireless communication device If the wireless communication device does not receive a system fallback message within the first time period, it automatically falls back to the second communication system and performs voice services in the second communication system, where the second communication system is different from the first communication system. system.
  • the wireless communication device automatically falls back to the second communication system, which may mean that the wireless communication device can search for the second communication system through the public land mobile network (Public Land Mobile Network, PLMN) selection process, cell selection process or cell reselection process, etc.
  • PLMN Public Land Mobile Network
  • the frequency point on the second communication system so as to try to access the frequency point on the second communication system.
  • the wireless communication device autonomously falls back to the second communication system, which may mean that the wireless communication device autonomously redirects to the second communication system, or may refer to autonomous network search to achieve the purpose of accessing the second communication system.
  • S203 may also be included. It should be noted that S203 is an optional step, and S203 is marked as a dotted box in FIG. 2 .
  • the wireless communication device monitors whether a system fallback message is received within the first time period, and automatically falls back to the second communication system if no system fallback message is received within the first time period. In this way, the wireless communication device can still fall back to other communication systems to provide voice services when the network device side misses sending the system fallback message.
  • the purpose of performing the fallback according to the system fallback message is carried out as far as possible.
  • the automatic fallback is performed. It can be seen that the solution provided by the embodiment of the present application can Make the wireless communication device fall back according to the system fallback message as much as possible, so that during the fallback process of the wireless communication device, the operations on the side of the wireless communication device can be reduced as much as possible, so as to achieve the purpose of being simpler and faster as much as possible.
  • the wireless communication device may also send a first message when the system fallback message is not received within the first time period, and the first message is used to indicate that the communication is abnormal. In this way, it is possible to report the detected "system fallback message missing from the network device side", so that the fault can be repaired as soon as possible in the event of a fault.
  • the embodiment of the present application involves the first communication system, the second communication system and other communication systems.
  • Other communication systems refer to communication systems different from the first communication system.
  • Other communication systems may be the same as or different from the second communication system.
  • the standard priority of the first communication system is higher than that of the second communication system.
  • the standard priority of the first communication system is higher than the standards of other communication systems.
  • the standard priority of a communication system in the embodiment of the present application may be preset, for example, the standard priority of the 5G communication system is higher than that of the 4G communication system, and the standard priority of the 4G communication system is higher than that of the 3G communication system.
  • Standard priority the standard priority of the 3G communication system is higher than that of the 2G communication system.
  • the first communication system is a 5G communication system
  • the second communication system is a 4G communication system, a 3G communication system or a 2G communication system
  • the other communication systems are a 4G communication system, a 3G communication system or a 2G communication system.
  • the first communication system is a 4G communication system
  • the second communication system is a 3G communication system or a 2G communication system
  • the other communication systems are a 3G communication system or a 2G communication system.
  • the first communication system may also be a future communication system of a higher standard than 5G, such as future 6G, 7G, etc.
  • the second communication system or other communication systems may be a 5G communication system.
  • the first communication system may be a 5G communication system
  • the second communication system may be a 4G communication system, a 3G communication system or a 2G communication system.
  • Other communication systems may be 4G communication systems, 3G communication systems or 2G communication systems.
  • the first communication system may be a 5G communication system
  • the second communication system may be a 4G communication system
  • the wireless communication device falls back to the second communication system for voice communication. If the business fails, you can continue to fall back from the second communication system to the third communication system.
  • the third communication system is, for example, a 2G communication system or a 3G communication system.
  • the standard priority of the third communication system can be lower than that of the second communication system. class.
  • the solution provided in FIG. 2 of the embodiment of the present application may also be adopted, and other solutions may also be adopted.
  • the second communication system may be equivalent to the first communication system in S201
  • the third communication system may be equivalent to the second communication system in S202.
  • the wireless communication device may detect the time when the voice service of the first communication system is detected (for example, when a session invitation message sent is detected, or when a received to the paging message) as the starting time of the first duration.
  • the wireless communication device may use the time when it is determined that the voice service fails in the first communication system as the starting time of the first duration. For example, after the wireless communication device detects that there is a demand for voice services, and determines that itself or the network equipment side does not support voice services under the first communication system, it determines that the current time is the starting time of the first duration.
  • the wireless communication device may determine that the network equipment does not support voice services under the first communication system. For example, it may be determined according to parameter information of the network equipment that the network equipment does not support voice services under the first communication system; For example, indication information may be received from the network device side, the indication information indicating that the network equipment does not support the voice service under the first communication system.
  • the wireless communication device determines that it does not support voice services under the first communication system. For example, it can be determined according to its own capability information; for another example, it can also receive indication information from the network equipment side, the indication information indicating that the wireless The communication device does not support voice services under the first communication system.
  • the wireless communication device may determine the foregoing first duration by setting a timer.
  • the above-mentioned wireless communication device determines the starting moment of the first duration can be understood as: the wireless communication device starts the timer at the starting moment of the first duration, that is, there are many ways to implement the timing of starting the timer , refer to the above content for details, and will not repeat them here.
  • the wireless communication device determines the above-mentioned first duration by setting a timer
  • the above-mentioned S201 may be replaced by: after detecting the voice service demand of the first communication system, start the timer, and monitor whether A system fallback message is received; the set duration of the timer is the first duration.
  • the above S202 can be replaced by: the wireless communication device automatically falls back to the second communication system and performs voice services in the second communication system if the wireless communication device does not receive the system fallback message before the set duration of the timer expires. .
  • the above S203 can be replaced by: in the case that the wireless communication device receives the system fallback message before the set time of the timer is reached, fall back to other communication systems according to the system fallback message, and perform voice services in other communication systems .
  • the setting of the first duration in the embodiment of the present application can be obtained based on experience. Counting from the starting moment of the first duration, the duration of the first duration can usually be longer than the length of the second duration.
  • the length of the second duration refers to the duration starting from the starting moment of the first duration and ending at the moment when the system fallback message may be received. For example, when the starting moment of the first duration is the moment when the session invitation message is initiated, or the moment when the paging message is received, the first duration can be set to 2.9 seconds, 2.8 seconds, 3 seconds, 3.1 seconds, etc.
  • the time length of the first duration may be a preset value.
  • the duration of the first duration may be understood as a set duration of the timer.
  • the length of the first duration may be related to at least one of the following contents: whether the voice service belongs to the emergency call service; or, whether the voice service belongs to the calling service.
  • the set duration of the timer may be shorter, for example, shorter than the set duration of the timer corresponding to the non-emergency call service. In this way, emergency calls can be connected faster, so that help can be provided to users faster.
  • the set duration of the timer may be shorter, for example, shorter than the set duration of the timer corresponding to the called service. In this way, the call of the calling party can be connected faster, so that the voice service can be provided to the user faster.
  • the wireless communication device may be the calling party.
  • the wireless communication device may, based on user operation triggers, in the cell of the first communication system (for easy distinction, the first communication system A cell called the first cell) sends a session invitation message, and the session invitation message is used to initiate a voice service.
  • the wireless communication device may determine that a demand for a voice service of the first communication system is detected in a case of sending a session invitation message.
  • Fig. 3a exemplarily shows a flowchart of a method for initiating a voice service when the wireless communication device is the calling party.
  • the wireless communication device is the terminal device 100 in FIG. 1b, and the wireless communication device initiates a voice call to other wireless communication devices (such as the terminal device 104), and the first communication system is a 5G communication system as an example.
  • the terminal device 100 resides in a cell under the 5G communication system.
  • the access of a wireless communication device to a communication system may include three parts, namely: cell search and cell selection process (can complete downlink synchronization, read broadcast information, cell residency); random access process (UE establishes uplink synchronization and initial connection with the network); attach process (completion of capability reporting, authentication request and security establishment).
  • cell search and cell selection process can complete downlink synchronization, read broadcast information, cell residency
  • random access process UE establishes uplink synchronization and initial connection with the network
  • attach process completion of capability reporting, authentication request and security establishment.
  • the wireless communication device may select different standards, such as LTE standard or NR standard. Select the corresponding system, that is, access to different access networks and core networks, and then initiate services supported by the corresponding network.
  • the terminal device 100 receives a user operation for triggering step S302.
  • the user operation in S301 may be: the user clicks a first icon on the screen of the terminal device 100 , and the first icon may be an icon indicating to call the terminal device 104 .
  • the terminal device 100 sends a session invitation message to the IMS.
  • the session invitation message in this embodiment of the application may be IMS_SIP_OUTGOING (sip_invite).
  • the session invitation message is used to initiate a voice service.
  • the terminal device 100 sends a service request to a network device under the 5G communication system.
  • the network equipment under the 5G communication system may be the access network equipment or the core network equipment under the 5G communication system, for example, it may be the 5GC mentioned in the foregoing content.
  • the service request in this embodiment of the application may be a service request (voice call).
  • the service request is used to request the network equipment of the 5G communication system to provide the VoNR service.
  • the terminal device 100 sends a radio resource control (Radio Resource Control, RRC) connection establishment request to the network device under the 5G communication system.
  • RRC Radio Resource Control
  • the RRC connection establishment request in the embodiment of the present application may be a connection establishment request RRC setup request.
  • the RRC connection establishment request under NR may also be written as RRC NR connection request.
  • NR is the abbreviation of New Radio (NR).
  • the network device under the 5G communication system After receiving the RRC connection establishment request, the network device under the 5G communication system sends an RRC connection establishment response to the terminal device 100 .
  • the RRC connection establishment response in this embodiment of the present application may be the connection establishment RRC setup.
  • the RRC connection establishment response under NR may also be written as RRC NR connection setup.
  • the terminal device 100 sends an RRC connection establishment complete message to the network device under the 5G communication system.
  • the RRC connection setup completion message in this embodiment of the present application may be RRC setup complete.
  • the RRC connection establishment completion message under NR may also be written as RRC NR connection setup complete.
  • the network device under the 5G communication system sends a service acceptance message to the terminal device 100.
  • the service acceptance message in this embodiment of the application may be service accept.
  • FIG. 3a exemplarily show the process in which the terminal device 100 as the calling party initiates a voice call through VoNR.
  • the wireless communication device may determine, based on any one of the steps from S302 to S307, that a voice service requirement of the first communication system is detected. For example, in the foregoing S201, the wireless communication device may determine that a voice service requirement of the first communication system is detected in a case where it is determined to send a session invitation message.
  • the wireless communication device may determine to detect a demand for a voice service of the first communication system in a case of determining to send a service request.
  • the wireless communication device may determine that a demand for a voice service of the first communication system is detected when it is determined that a service acceptance message is received.
  • the wireless communication device may be the called party.
  • other wireless communication devices such as the terminal device 104 in FIG. 100
  • Initiate a call After other wireless communication devices (such as the terminal device 104 in FIG.
  • the message is used to instruct other wireless communication devices to initiate voice services to the wireless communication device.
  • the wireless communication device may determine that a demand for a voice service of the first communication system is detected when a paging message is received.
  • Fig. 3b exemplarily shows a flowchart of a method for initiating a voice service when the wireless communication device is the called party.
  • the wireless communication device is the terminal device 100 in FIG. 1b, and other wireless communication devices (such as the terminal device 104) initiate a voice call to the terminal device 100, and the first communication system is a 5G communication system as an example.
  • the terminal device 100 resides in a cell under the 5G communication system.
  • the terminal device 100 receives a paging message from a network device under the 5G communication system.
  • the paging message in this embodiment of the present application may be RRC (paging (voice call)).
  • the terminal device 100 sends a service request to a network device under the 5G communication system.
  • the network equipment under the 5G communication system may be the access network equipment or the core network equipment under the 5G communication system, for example, it may be the 5GC mentioned in the foregoing content.
  • the service request in this embodiment of the application may be a service request (voice call).
  • the service request is used to request the network equipment of the 5G communication system to provide the VoNR service.
  • the terminal device 100 sends a radio resource control (Radio Resource Control, RRC) connection establishment request to the network device under the 5G communication system.
  • RRC Radio Resource Control
  • the network device under the 5G communication system After receiving the RRC connection establishment request, the network device under the 5G communication system sends an RRC connection establishment response to the terminal device 100 .
  • the terminal device 100 sends an RRC connection establishment complete message to the network device under the 5G communication system.
  • the network device under the 5G communication system sends a service acceptance message to the terminal device 100.
  • the service acceptance message in this embodiment of the application may be service accept.
  • FIG. 3 b exemplarily shows the process in which the terminal device 100 as the called party initiates a voice call through VoNR.
  • the wireless communication device may determine, based on any one of the steps from S311 to S316, that a voice service requirement of the first communication system is detected. For example, in the foregoing S201, the wireless communication device may determine that a voice service requirement of the first communication system is detected when it is determined that a paging message is received.
  • the wireless communication device may determine to detect a demand for a voice service of the first communication system in a case of determining to send a service request.
  • the wireless communication device may determine that a demand for a voice service of the first communication system is detected when it is determined that a service acceptance message is received.
  • FIG. 4a exemplarily shows a schematic flowchart of a method for a wireless communication device to fall back from a first communication system to a second communication system according to an embodiment of the present application.
  • FIG. 4 a shows that the first communication system is a 5G communication system, the second communication system is a 4G communication system, and the wireless communication device is a terminal device 100 as an example.
  • FIG. 4a mainly shows a scheme in which the wireless communication device does not receive the system fallback message.
  • the method includes:
  • the terminal device 100 After the terminal device 100 detects a voice service requirement of the first communication system, it monitors whether a system fallback message is received within a first time period.
  • the steps in Fig. 4a may be combined with the above-mentioned steps in Fig. 3a, and may also be combined with the steps in Fig. 3b.
  • the terminal device 100 may perform S401 after sending the session invitation message in S302, so as to monitor whether a system fallback message is received within the first time period.
  • the terminal device 100 may execute S401 after receiving the paging message in S311, so as to monitor whether a system fallback message is received within the first time period.
  • the network device under the 5G communication system recognizes that the VoNR call is not supported, and then triggers step S403, so as to send a system fallback message to the terminal device 100.
  • S402 may be performed after the above S316, or may be performed after the above S307.
  • FIG. 4a shows a schematic diagram of a solution in which the terminal device 100 in S202 above does not receive the system fallback message. Please continue to refer to FIG. 4a. As shown in FIG. 4a, the method also includes:
  • the terminal device 100 does not receive the system fallback message within the first time period, and determines to perform the fallback of the communication system autonomously.
  • the wireless communication device after the wireless communication device automatically falls back to the 4G communication system, it needs to read the 4G side system information before establishing the VoLTE service, and if the evolved packet system (evolved packet system) , EPS) fallback (fallback) before there is a data service, and the bearer can also be re-established on the LTE side to restore the data service.
  • the following S404 to S409 exemplarily show a possible method flow of a terminal device accessing a 4G communication system after S403.
  • the terminal device 100 receives a system message sent by a network device under the 4G communication system.
  • system message in S404 may be system information.
  • system messages can be received by receiving broadcast messages.
  • the system information may include frequency point, frequency band, public land mobile network (Public Land Mobile Network, PLMN), physical cell identification (Identification, ID), bandwidth, discontinuous reception (discontinuous reception) , DRX) cycle and other information.
  • PLMN Public Land Mobile Network
  • PLMN physical cell identification
  • ID identification
  • ID bandwidth
  • discontinuous reception discontinuous reception
  • DRX discontinuous reception
  • the terminal device 100 sends a TAU request to the network device under the 4G communication system.
  • the network device under the 4G communication system sends a TAU acceptance to the terminal device 100.
  • the TAU accept in S325 may also be a TAU accept message, or TAU accept.
  • the terminal device 100 sends a TAU completion to the network device under the 4G communication system.
  • the TAU completion in S407 may also be a TAU completion message, or may be TAU complete.
  • the terminal device 100 sends a bearer establishment request to the network device under the 4G communication system.
  • the bearer establishment request in S408 may be an activate dedicated eps bearer context request.
  • the network device under the 4G communication system sends a bearer establishment acceptance to the terminal device 100.
  • the bearer establishment acceptance in S409 may be Bearer context accept.
  • the terminal device 100 performs a voice service in the 4G communication system.
  • S410 There may be two situations in S410. If the voice service of the terminal device in the 4G communication system is successful, the subsequent S411 may be performed.
  • the terminal device 100 needs to fall back to the 2G or 3G communication system again .
  • the process of the terminal device 100 falling back from the 4G communication system to the 2G or 3G communication system may automatically fall back to the 2G or 3G communication system.
  • Another example may be to fall back to the 2G or 3G communication system based on the system fallback message issued by the 4G communication system.
  • the terminal device 100 after determining the voice service requirements of the 4G communication system, it is possible to monitor whether a system fallback message from the network equipment of the 4G communication system is received within the first period of time, and if the system fallback message from the network equipment of the 4G communication system is received , then fall back to the 2G or 3G communication system based on the system fallback message from the network device of the 4G communication system. If the system fallback message from the network device of the 4G communication system is not received, the terminal device 100 automatically falls back to the 2G or 3G communication system.
  • the solution in Figure 2 above can also be used during the second fallback process, the difference is only that in the second fallback process, the first communication system is a 4G communication system, and the second communication system is a 2G or 3G communication system system, the second communication system is a 2G or 3G communication system.
  • the relevant content in Figure 2 is similar and will not be repeated here.
  • the terminal device may return to the first communication system, or may continue to reside in the second communication system.
  • the embodiment of this application is not limited.
  • FIG. 4b exemplarily shows a schematic flowchart of a method for a wireless communication device to fall back from a first communication system to another communication system according to an embodiment of the present application.
  • FIG. 4b shows an example in which the first communication system is a 5G communication system, the other communication systems are a 4G communication system, and the wireless communication device is a terminal device 100 .
  • Fig. 4b mainly shows a scheme in which the wireless communication device receives the system fallback message.
  • the method includes:
  • the terminal device 100 After the terminal device 100 detects a voice service requirement of the first communication system, it monitors whether a system fallback message is received within a first time period.
  • the terminal device 100 may execute S501 after sending the session invitation message in S302, so as to monitor whether a system fallback message is received within the first time period.
  • the terminal device 100 may execute S501 after receiving the paging message in S311, so as to monitor whether a system fallback message is received within the first time period.
  • the network device under the 5G communication system recognizes that the VoNR call is not supported, and then triggers step S503, so as to send a system fallback message to the terminal device 100.
  • S502 may be performed after the above S316, or may be performed after the above S307.
  • FIG. 4b shows a schematic diagram of the solution in which the terminal device 100 receives the system fallback message in S203 above. Please continue to refer to FIG. 4b. As shown in FIG. 4b, the method also includes:
  • the network device under the 5G communication system sends a system fallback message to the terminal device 100.
  • the terminal device 100 receives the system fallback message, and determines to perform the fallback of the communication system based on the system fallback message.
  • the system fallback message in S322 may be a mobility from NR command, may also be an RRC connection release message, or may be an RRC Connection Release message.
  • the system fallback message in S322 of the network device under the 5G communication system may carry the frequency point of the target LTE, multiple target cell IDs, messages or system messages of the target cell, and the like.
  • the information of the target cell may be information such as a frequency point of the cell.
  • the system fallback message in S322 instructs the terminal device 100 to perform redirection, and may initiate an S1 terminal device context release process.
  • the wireless communication device may fall back from the 5G communication system to the 4G communication system through handover, redirection, etc. according to an instruction of the network device.
  • the wireless communication device based on the EPS fallback of the redirection (redirection) method, after the terminal falls back to the 4G communication system, it needs to read the system information on the 4G side, and then establish the VoLTE service, and if there is a data service before the EPS fallback, The bearer can also be re-established on the LTE side to restore the data service.
  • S505 to S510 exemplarily show a possible method flow after S504.
  • the terminal device 100 receives a system message sent by a network device under the 4G communication system.
  • system message in S505 may be system information.
  • system messages can be received by receiving broadcast messages.
  • the system information may include frequency point, frequency band, public land mobile network (Public Land Mobile Network, PLMN), physical cell identification (Identification, ID), bandwidth, discontinuous reception (discontinuous reception) , DRX) cycle and other information.
  • PLMN Public Land Mobile Network
  • PLMN physical cell identification
  • ID identification
  • ID bandwidth
  • discontinuous reception discontinuous reception
  • DRX discontinuous reception
  • the terminal device 100 sends a tracking area update (Tracking Area Update, TAU) request to the network device under the 4G communication system.
  • TAU Tracking Area Update
  • the network device under the 4G communication system sends a TAU acceptance to the terminal device 100.
  • the TAU accept in S507 may also be a TAU accept message, or TAU accept.
  • the terminal device 100 sends a TAU completion to the network device under the 4G communication system.
  • the TAU completion in S508 may also be a TAU completion message, or may be TAU complete.
  • the terminal device 100 sends a bearer establishment request to the network device under the 4G communication system.
  • the bearer establishment request in S509 may be an activate dedicated eps bearer context request.
  • the network device under the 4G communication system sends a bearer establishment acceptance to the terminal device 100.
  • the bearer establishment acceptance in S510 may be Bearer context accept.
  • the terminal device 100 performs a voice service in the 4G communication system.
  • S511 There may be two situations in S511. If the voice service of the terminal device in the 4G communication system is successful, the subsequent S512 may be executed.
  • the terminal device 100 needs to fall back to the 2G or 3G communication system again .
  • the process of the terminal device 100 falling back from the 4G communication system to the 2G or 3G communication system may automatically fall back to the 2G or 3G communication system.
  • Another example may be to fall back to the 2G or 3G communication system based on the system fallback message issued by the 4G communication system.
  • the terminal device 100 after determining the voice service requirements of the 4G communication system, it is possible to monitor whether a system fallback message from the network equipment of the 4G communication system is received within the first period of time, and if the system fallback message from the network equipment of the 4G communication system is received , then fall back to the 2G or 3G communication system based on the system fallback message from the network device of the 4G communication system. If the system fallback message from the network device of the 4G communication system is not received, the terminal device 100 automatically falls back to the 2G or 3G communication system.
  • the scheme in Figure 2 above can also be used in the second fallback process, the difference is only that in the second fallback process, the first communication system is a 4G communication system, and the other communication systems are 2G or 3G communication systems , the second communication system is a 2G or 3G communication system.
  • the relevant content in Figure 2 is similar and will not be repeated here.
  • the terminal device may return to the first communication system, or may continue to reside in the second communication system.
  • the embodiment of this application is not limited.
  • Fig. 5 exemplarily shows a schematic flowchart of a method for a wireless communication device provided by another embodiment of the present application.
  • the first communication system is a 5G communication system
  • the other communication systems are a 4G communication system
  • the wireless communication device is a user equipment (user equipment, UE) as an example for introduction.
  • the method includes:
  • the wireless communication device (such as a UE) resides on a 5G access network (such as a next generation radio access network (NG RAN)), and initiates a calling (mobile originated, MO) service or a called ( mobile terminated, MT) business.
  • a 5G access network such as a next generation radio access network (NG RAN)
  • MO mobile originated, MO
  • MT mobile terminated, MT
  • the foregoing S201 may be performed after S601.
  • the wireless communication device may start monitoring after initiating the calling (mobile originated, MO) service or the called (mobile terminated, MT) service, so as to monitor whether a system fallback message is received within the first time period.
  • the wireless communication device may start monitoring after initiating the calling (mobile originated, MO) service or the called (mobile terminated, MT) service, so as to monitor whether a system fallback message is received within the first time period.
  • the English corresponding to S601 can be: UE camps on NG-RAN in the 5GS and an MO or MT IMS voice session establishment has been initiated.
  • 5GS is the abbreviation of 5G communication system (system).
  • E-UTRAN in FIG. 5 is an abbreviation of evolved universal terrestrial radio access network (evolved universal terrestrial radio access network, E-UTRAN).
  • the MME is an abbreviation of a mobility management entity (MME).
  • SGW is the abbreviation of serving gateway (serving gateway, SGW).
  • PCF is the abbreviation of policy control function (PCF).
  • the network device side establishes a corresponding protocol data unit (protocol data unit, PDU) session and quality of service (quality of service, QoS) flow for NG-RAN voice services (such as IMS voice services).
  • PDU protocol data unit
  • QoS quality of service
  • the English corresponding to S602 can be: Network initiated PDU Session modification to setup QoS flow for voice reaches the NG-RAN.
  • NG-RAN is configured to support EPS fallback of IMS voice, and trigger EPS fallback, taking into account the capabilities of the wireless communication device, from the access and mobility management function (AMF) An indication of "possible redirection for EPS voice fallback".
  • AMF access and mobility management function
  • the NG-RAN triggers the fallback of the EPS, which may trigger the network device side to send a system fallback message.
  • the network device may miss sending the system fallback message.
  • the network device fails to send the system fallback message, that is, for a possible implementation manner of the above S202, reference may be made to related steps from S403 to S411 in FIG. 4a.
  • NG-RAN is configured to support EPS fallback for IMS voice and decides to trigger fallback to EPS, taking into account UE capabilities, indication from AMF that "Redirection for EPS fallback for voice is possible”.
  • NG-RAN may send a PDU session response message to PGW-C+SMF (or H-SMF+PGW-C via V-SMF, in the case of roaming scenarios) through AMF, and the PDU session response message indicates rejection of IMS voice establishment , and indicates that fallback due to IMS voice is in progress.
  • PGW-C+SMF or H-SMF+PGW-C via V-SMF, in the case of roaming scenarios
  • PGW-C is a control plane PDN gateway (packet data network gateway for control plane, PGW-C).
  • PDN is the abbreviation of Packet Data Network (PDN).
  • SMF is the abbreviation of Session Management Function (SMF).
  • H-SMF is the abbreviation of Home SMF.
  • V-SMF is the abbreviation of roaming ground SMF.
  • the English corresponding to S604 can be: NG-RAN responds indicating rejection of the PDU Session modification to setup QoS flow for IMS voice received in step S2012 by PDU Session Response message towards the PGW-C+SMF(or H-SMF+P-GW -C via V-SMF,in case of roaming scenario)via AMF with an indication that mobility due to fallback for IMS voice is ongoing.
  • the wireless communication device accesses the 4G communication system through handover or redirection.
  • the English corresponding to S604 can be: NG-RAN initiates either handover(see clause 4.11.1.2.1), or AN Release via inter-system redirection to EPS(see clause 4.2.6 and clause 4.11.1.3.2), taking into account UE capabilities.
  • S606a or S606b may be executed.
  • the English corresponding to S606b can be: attach with PDN connectivity request with request type "handover".
  • the network modifies and establishes a dedicated bearer for the voice service by establishing a PDN connection.
  • the English corresponding to S607 can be: Network initiated PDN connection modification to setup dedicated bearer for voice.
  • the English corresponding to S608 can be: The IMS voice session establishment is continued.
  • a certain network element receives information from another network element (for example: B network element), which may mean that A network element directly receives information from B network element, or It means that NE A receives information from NE B via other NEs (for example: NE C).
  • B network element receives information from another network element
  • NE C receives information from NE B via other NEs
  • network element C can transparently transmit the information, or process the information, for example, carry the information in different messages for transmission or filter the information , and only send the filtered information to network element A.
  • sending information from network element A to network element B may mean that network element A directly sends information to network element B, or it may mean that network element A transmits information via other network elements (for example: network C). element) sends information to network element B.
  • system and "network” can be replaced with each other.
  • the system architecture described in the embodiments of the present application is to illustrate the technical solutions of the embodiments of the present application more clearly, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application.
  • Those of ordinary skill in the art know that with the evolution of the network architecture , the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • each network element includes a corresponding hardware structure and/or software module for performing each function.
  • the present invention can be realized in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.
  • the wireless communication device includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software with reference to the units and method steps of each example described in the embodiments disclosed in the present application. Whether a certain function is executed by hardware or by computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.
  • FIG. 6 , FIG. 7 and FIG. 8 are schematic structural diagrams of possible communication devices provided by embodiments of the present application. These communication devices can be used to implement the functions of the wireless communication devices in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.
  • the communication device may be a wireless communication device as shown in FIG. 1a, FIG. 1b or FIG. 1c, and may also be a module (such as a chip) applied to a wireless communication device.
  • a communication device 1300 includes a processing unit 1310 and a transceiver unit 1320 .
  • the communication device 1300 is configured to implement the functions of the wireless communication device in the method embodiments shown in FIG. 2 , FIG. 3a , FIG. 3b , FIG. 4a , FIG. 4b or FIG. 5 .
  • the communication device 1300 When the communication device 1300 is used to implement the functions of the wireless communication device in the method embodiment shown in FIG. 2, FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b or FIG.
  • processing unit 1310 and the transceiver unit 1320 can be directly obtained by referring to the relevant descriptions in the method embodiments shown in FIG. 2 , FIG. 3a , FIG. 3b , FIG. 4a , FIG. 4b or FIG.
  • the communication device 1400 includes a processing circuit 1410 and an interface circuit 1420 .
  • the processing circuit 1410 and the interface circuit 1420 are coupled to each other.
  • the interface circuit 1420 may be a transceiver or an input-output interface.
  • the communication device 1400 may further include a memory for storing instructions executed by the processing circuit, or storing input data required by the processing circuit 1410 to execute the instructions, or storing data generated after the processing circuit 1410 executes the instructions.
  • FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b or FIG. Functions of the transceiver unit 1320 .
  • the communication device 1500 includes a processor 1510 and a communication interface 1520 .
  • the processor 1510 and the communication interface 1520 are coupled to each other.
  • the communication interface 1520 may be a transceiver or an input and output interface.
  • the communication device 1500 may further include a memory 1530 for storing instructions executed by the processor 1510 or storing input data required by the processor 1510 to execute the instructions or storing data generated by the processor 1510 after executing the instructions.
  • FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b or FIG. Functions of the transceiver unit 1320 .
  • the communication device 1500 When the communication device 1500 is used to implement the functions of the wireless communication device in the method embodiment shown in FIG. 2, FIG. 3a, FIG. 3b, FIG. 4a, FIG. 4b or FIG.
  • the wireless communication device chip implements the functions of the wireless communication device in the above method embodiment.
  • the wireless communication device chip receives information from other modules (such as radio frequency modules or antennas) in the wireless communication device, and the information is sent to the wireless communication device by the network equipment; or, the wireless communication device chip sends information to other modules in the wireless communication device (such as a radio frequency module or an antenna) to send information, which is sent by the wireless communication device to the network device.
  • the processor in the embodiments of the present application can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor can be a microprocessor, or any conventional processor.
  • the present application also provides a computer program product, the computer program product including: computer program code or instruction, when the computer program code or instruction is run on the computer, the computer is made to execute the , the method of any one of the embodiments shown in Fig. 3a, Fig. 3b, Fig. 4a, Fig. 4b or Fig. 5.
  • the present application also provides a computer-readable storage medium, the computer-readable medium stores program code, and when the program code is run on the computer, the computer is made to execute the steps shown in Figure 2 and Figure 3a. , the method of any one of the embodiments shown in Fig. 3b, Fig. 4a, Fig. 4b or Fig. 5 .
  • the present application further provides a chip system, where the chip system may include a processor.
  • the processor is coupled with the memory, and may be used to execute the method in any one of the embodiments shown in FIG. 2 , FIG. 3a , FIG. 3b , FIG. 4a , FIG. 4b or FIG. 5 .
  • the chip system further includes a memory. Memory, used to store computer programs (also called code, or instructions).
  • the processor is configured to call and run a computer program from the memory, so that the device installed with the chip system executes the method of any one of the embodiments shown in FIG. 2 , FIG. 3a , FIG. 3b , FIG. 4a , FIG. 4b or FIG. 5 .
  • the present application further provides a system, which includes the foregoing wireless communication apparatus and network equipment.
  • the method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only Memory, registers, hard disk, removable hard disk, CD-ROM or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and storage medium can be located in the ASIC. Additionally, the ASIC may be located in a wireless communication device. Of course, the processor and the storage medium may also exist in the wireless communication device as discrete components.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • a computer program product consists of one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on the computer, the processes or functions of the embodiments of the present application are executed in whole or in part.
  • the computer can be a general purpose computer, special purpose computer, computer network, network equipment, user equipment, or other programmable apparatus.
  • Computer programs or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, computer programs or instructions may be Wired or wireless transmission to another website site, computer, server or data center.
  • a computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media. Available media may be magnetic media, such as floppy disks, hard disks, and magnetic tapes; optical media, such as digital video discs; or semiconductor media, such as solid-state hard disks.
  • the computer readable storage medium may be a volatile or a nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.
  • “plurality” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the contextual objects are an “or” relationship; in the formulas of this application, the character “/” indicates that the contextual objects are a “division” Relationship.
  • “Including at least one of A, B and C” may mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Procédé pour un appareil de communication sans fil, et appareil, support d'enregistrement et système de puce, au moyen desquels un dispositif de communication sans fil revient à un second système de communication s'il existe une exigence de service vocal pour un premier système de communication, ce qui garantit une exigence de service vocal d'un utilisateur. Dans la présente demande, après la détection d'une exigence de service vocal pour un premier système de communication par un appareil de communication sans fil, l'appareil de communication sans fil surveille si un message de repli de système est reçu dans une première durée ; et si l'appareil de communication sans fil n'a pas reçu le message de repli de système dans la première durée, celui-ci retombe de manière autonome dans un second système de communication et effectue un service vocal dans le second système de communication. De cette manière, si un appareil de communication sans fil n'a pas reçu un message de repli de système dans une première durée, celui-ci peut retomber de manière autonome dans un second système de communication et effectuer un service vocal dans le second système de communication, ce qui garantit une exigence de service vocal d'un utilisateur.
PCT/CN2021/112001 2021-08-11 2021-08-11 Procédé pour appareil de communication sans fil, et appareil, support d'enregistrement et système de puce WO2023015474A1 (fr)

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