WO2021212465A1 - 无线通信方法和终端设备 - Google Patents

无线通信方法和终端设备 Download PDF

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Publication number
WO2021212465A1
WO2021212465A1 PCT/CN2020/086673 CN2020086673W WO2021212465A1 WO 2021212465 A1 WO2021212465 A1 WO 2021212465A1 CN 2020086673 W CN2020086673 W CN 2020086673W WO 2021212465 A1 WO2021212465 A1 WO 2021212465A1
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WO
WIPO (PCT)
Prior art keywords
terminal
remote terminal
information
remote
relay
Prior art date
Application number
PCT/CN2020/086673
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English (en)
French (fr)
Inventor
刘建华
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN202080095032.8A priority Critical patent/CN115004848A/zh
Priority to PCT/CN2020/086673 priority patent/WO2021212465A1/zh
Publication of WO2021212465A1 publication Critical patent/WO2021212465A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the embodiments of the present application relate to the communication field, and more specifically, to a wireless communication method and terminal device.
  • a terminal device with Proximity-based Services (ProSe) capability can directly communicate with another terminal device with ProSe capability through a PC5 interface.
  • a terminal device can connect to an external data network through the fifth generation mobile communication (The 5th Generation, 5G) network and has ProSe capability
  • this terminal device can act as a relay UE, and another one with ProSe capability
  • a remote terminal can establish a direct connection with a relay terminal through a PC5 interface, and interact with an external network through a Protocol Data Unit (PDU) session established by the relay terminal and the 5G network.
  • PDU Protocol Data Unit
  • the remote terminal disconnects the PC5 from the relay terminal, the opposite application server or the opposite terminal device cannot actively interact with the remote terminal, which limits the service usage scenarios of the remote terminal accessing the network through the relay terminal .
  • the embodiments of the present application provide a wireless communication method and terminal equipment. After the remote terminal disconnects the PC5 from the relay terminal, the application server at the opposite end or the terminal equipment at the opposite end can actively interact with the remote terminal. Service usage scenarios where the end terminal accesses the network through the relay terminal.
  • a wireless communication method including:
  • the relay terminal After the connection between the relay terminal and the remote terminal is disconnected, and the relay terminal receives downlink data targeted to the remote terminal or the relay terminal receives data targeted to the remote terminal In the case of a downlink data notification message, the relay terminal triggers the re-establishment of the connection with the remote terminal.
  • a wireless communication method in a second aspect, includes:
  • the remote terminal After the connection between the relay terminal and the remote terminal is disconnected, the remote terminal reestablishes the connection with the relay terminal according to the trigger of the relay terminal.
  • a terminal device for executing the method performed by the relay terminal in the above-mentioned first aspect.
  • the terminal device includes a functional module for executing the method executed by the relay terminal in the above-mentioned first aspect.
  • a terminal device for executing the method performed by the remote terminal in the above second aspect.
  • the network device includes a functional module for executing the method executed by the remote terminal in the second aspect described above.
  • a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method executed by the relay terminal in the first aspect described above.
  • a terminal device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the method executed by the remote terminal in the second aspect described above.
  • a device for implementing the method performed by the relay terminal in the first aspect and the method performed by the remote terminal in the second aspect.
  • the device includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the device executes the method performed by the relay terminal in the first aspect and the remote terminal in the second aspect The method performed.
  • a computer-readable storage medium for storing a computer program that enables a computer to execute the method executed by the relay terminal in the first aspect and the method executed by the remote terminal in the second aspect.
  • a computer program product including computer program instructions that cause a computer to execute the method executed by the relay terminal in the first aspect and the method executed by the remote terminal in the second aspect.
  • a computer program which when running on a computer, causes the computer to execute the method executed by the relay terminal in the first aspect and the method executed by the remote terminal in the second aspect.
  • the relay terminal triggers the re-establishment of the connection with the remote terminal.
  • the remote terminal reestablishes the connection with the relay terminal according to the trigger of the relay terminal. This expands the service usage scenarios of the remote terminal accessing the network through the relay terminal, and improves the user experience.
  • FIG. 1 is a schematic diagram of a communication system architecture provided by an embodiment of the present application.
  • Fig. 2 is a schematic diagram of a relay communication system architecture provided by an embodiment of the present application.
  • Fig. 3 is a schematic flowchart of a wireless communication method provided according to an embodiment of the present application.
  • Fig. 4 is a schematic flowchart of another wireless communication method provided according to an embodiment of the present application.
  • Fig. 5 is a schematic flowchart for reestablishing the connection of the PC5 according to an embodiment of the present application.
  • Fig. 6 is another schematic flowchart for reestablishing the connection of the PC5 according to an embodiment of the present application.
  • Fig. 7 is a schematic flowchart of yet another method for reestablishing the connection of the PC5 according to an embodiment of the present application.
  • Fig. 8 is a schematic flowchart of yet another method for reestablishing the connection of the PC5 according to an embodiment of the present application.
  • Fig. 9 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Fig. 10 is a schematic block diagram of another terminal device according to an embodiment of the present application.
  • Fig. 11 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • Fig. 12 is a schematic block diagram of an apparatus provided according to an embodiment of the present application.
  • Fig. 13 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • New Air Interface The (New Radio, NR) system the evolution system of the NR system, the LTE (LTE-based access to unlicensed spectrum, LTE-U) system on the unlicensed spectrum, the NR (NR-based access to unlicensed spectrum, on the unlicensed spectrum, NR-U) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), next-generation communication systems or other communication systems, etc.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • NR New Air Interface
  • UMTS Universal Mobile Telecommunication System
  • WLAN Wireless
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC machine type communication
  • V2V vehicle to vehicle
  • the communication system in the embodiments of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, can also be applied to a dual connectivity (DC) scenario, and can also be applied to a standalone (SA) deployment.
  • CA Carrier Aggregation
  • DC dual connectivity
  • SA standalone
  • the embodiment of the application does not limit the applied frequency spectrum.
  • the embodiments of this application can be applied to licensed spectrum or unlicensed spectrum.
  • Fig. 1 exemplarily shows a schematic diagram of a communication system 100 applied in this application.
  • the communication system 100 mainly includes terminal equipment (User Equipment, UE) 101, access network (Access Network, AN) equipment 102, access and mobility management function (Access and Mobility Management Function, AMF) Entity 103, Session Management Function (SMF) entity 104, User Plane Function (UPF) entity 105, Policy Control Function (PCF) entity 106, Unified Data Management (Unified Data Management, UDM) entity 107, data network (DN) 108, application function (AF) entity 109, authentication server function (Authentication Server Function, AUSF) entity 110, network slice selection function (Network Slice Selection Function, NSSF) entity 111.
  • terminal equipment User Equipment, UE
  • Access Network Access Network
  • AN Access Network
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • UPF User Plane Function
  • PCF Policy Control Function
  • UDM Unified Data Management
  • UDM Unified Data Management
  • the UE 101 connects with the AN device 102 through the Uu interface to connect to the access layer ( Non-Access Stratum, NAS) connection to exchange NAS messages; the AN device 102 is connected to the AMF entity 103 through the N2 interface, and the AN device 102 is connected to the UPF entity 105 through the N3 interface; multiple UPF entities 105 are connected through the N9 interface , The UPF entity 105 is connected to the DN 108 through the N6 interface, while the UPF entity 105 is connected to the SMF entity 104 through the N4 interface; the SMF entity 104 is connected to the PCF entity 106 through the N7 interface, and the SMF entity 104 is connected to the UDM entity 107 through the N10 interface.
  • NAS Non-Access Stratum
  • the SMF entity 104 controls the UPF entity 105 through the N4 interface.
  • the SMF entity 104 is connected to the AMF entity 103 through the N11 interface; multiple AMF entities 103 are connected through the N14 interface, and the AMF entity 103 is connected to the UDM entity 107 through the N8 interface.
  • AMF The entity 103 is connected to the AUSF entity 110 through the N12 interface, and the AMF entity 103 is connected to the NSSF entity 111 through the N22 interface.
  • the AMF entity 103 is connected to the PCF entity 106 through the N15 interface; the PCF entity 106 is connected to the AF entity 109 through the N5 interface; AUSF The entity 110 is connected to the UDM entity 107 through the N13 interface.
  • the UDM entity 107 is a subscription database in the core network, which stores user subscription data in the 5G network.
  • the AMF entity 103 is the mobility management function in the core network
  • the SMF entity 104 is the session management function in the core network.
  • the AMF entity 103 is also responsible for sending information related to session management to the UE 101.
  • SMF entity 104 forwarding.
  • the PCF entity 106 is a policy management function in the core network, and is responsible for formulating policies related to UE 101's mobility management, session management, and charging.
  • the UPF entity 105 is a user plane function in the core network, and performs data transmission with an external data network through the N6 interface, and performs data transmission with the AN device 102 through the N3 interface.
  • the UE 101 accesses the 5G network through the Uu port, it establishes a protocol data unit (Protocol Data Unit, PDU) session data connection between the UE 101 and the UPF entity 105 under the control of the SMF entity 104 to perform data transmission.
  • the AMF entity 103 and the SMF entity 104 obtain user subscription data from the UDM entity 107 through the N8 and N10 interfaces, respectively, and obtain policy data from the PCF entity 106 through the N15 and N7 interfaces.
  • PDU Protocol Data Unit
  • NEF Network Exposure Function
  • communication devices devices with communication functions in the network/system in the embodiments of the present application may be referred to as communication devices.
  • terminal equipment may also be referred to as user equipment, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile Device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • the terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, and personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, and next-generation communication systems, such as terminal devices in the NR network or Terminal equipment in the public land mobile network (PLMN) network that will evolve in the future.
  • STAION, ST station
  • WLAN Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for using wearable technology to intelligently design everyday wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • the aforementioned AN device 102 may be a device for communicating with mobile devices.
  • the AN device 102 may be an access point (Access Point, AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, or it may be
  • the base station (NodeB, NB) in WCDMA can also be the Evolutional Node B (eNB or eNodeB) in LTE, or relay station or access point, or vehicle-mounted equipment, wearable equipment, and base station in NR network ( gNB) or network equipment in the future evolved PLMN network.
  • eNB Evolutional Node B
  • gNB NR network
  • the network equipment provides services for the cell
  • the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell
  • the cell may be a network equipment (for example, The cell corresponding to the base station.
  • the cell can belong to a macro base station or a base station corresponding to a small cell.
  • the small cell here can include: Metro cell, Micro cell, Pico Cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • a terminal device with ProSe capability can directly communicate with another terminal device with ProSe capability through a PC5 interface.
  • a terminal device can connect to an external data network through a 5G network and has ProSe capability
  • this terminal device can act as a relay terminal
  • another remote terminal with ProSe capability can establish a direct connection with the Relay UE through the PC5 interface, and Interact with the external network through the PDU session established by the remote terminal and the 5G network.
  • the system architecture is shown in Figure 2.
  • the remote terminal is connected to the relay terminal through the PC5 interface, and the relay terminal is connected to the Next Generation Evolutional Radio Access Network (NG-RAN) through the Uu interface to connect to 5G
  • the core network (5G Core Network, 5GC)
  • 5GC is connected to the application server (application server, AS) through the N6 interface.
  • FIG. 2 takes a 5G communication system as an example for description. Of course, it can also be applied to other 3GPP communication systems, such as 4G communication systems, or future 3GPP communication systems, which is not limited in this application.
  • the application server (AS) in FIG. 2 may also be other terminal devices or the external public safety Internet.
  • a remote terminal with ProSe capability When a remote terminal with ProSe capability establishes a direct connection with the relay terminal through the PC5 interface, and interacts with the external network through the PDU session established by the relay terminal and the 5G network, because the remote terminal is conducted through the PDU session of the relay terminal For data transmission, the network side still considers the relay terminal to access the network for data transmission. The network side does not maintain the context of the remote terminal separately, and does not perceive whether the PC5 between the remote terminal and the relay terminal is connected or disconnected. This results in that only when the remote terminal actively establishes a PC5 connection with the relay terminal, it can interact with the application server of the opposite end or other terminal equipment of the opposite end through the 5G network.
  • the application server of the opposite end or the terminal device of the opposite end cannot actively interact with the remote terminal, which limits the service usage scenarios of the remote terminal accessing the network through the relay terminal. For example, if a remote terminal accesses a video chat application through a 5G network, the application server at the opposite end of the remote terminal is a video chat application server. For another example, if a remote terminal accesses a browser through a 5G network, the application server at the opposite end of the remote terminal is the browser server. For another example, if a remote terminal interacts with a target terminal through a 5G network, the terminal device at the opposite end of the remote terminal is the target terminal.
  • this application proposes a relay communication scheme.
  • the relay terminal continues to maintain the remote terminal's context after disconnecting from the remote terminal’s PC5.
  • the relay terminal triggers the re-establishment of the PC5 connection between the remote terminal and the relay terminal according to the context of the remote terminal saved by itself, thereby sending the downlink data to the remote terminal.
  • FIG. 3 is a schematic flowchart of a wireless communication method 200 according to an embodiment of the present application. As shown in FIG. 3, the method 200 may include but is not limited to the following content:
  • the remote terminal accesses the network through the relay terminal, and when the remote terminal and the relay terminal establish a PC5 connection, the remote terminal can communicate with the application server of the opposite end or other terminal equipment of the opposite end through the network. To interact.
  • the relay terminal after the connection between the relay terminal and the remote terminal is disconnected, the relay terminal receives downlink data targeted to the remote terminal or the relay terminal receives downlink data targeted to the remote terminal In the case of the notification message, the relay terminal triggers the reestablishment of the connection with the remote terminal. That is, the remote terminal's opposite application server or the opposite terminal device can actively interact with the remote terminal, which expands the service usage scenarios of the remote terminal accessing the network through the relay terminal, and improves the user experience.
  • connection between the relay terminal and the remote terminal may be a PC5 connection.
  • the reason for the disconnection between the relay terminal and the remote terminal may be that the remote terminal actively triggers the disconnection, or the relay terminal actively triggers the connection release, or it may be caused by wireless After the quality deteriorates or the remote terminal leaves the coverage area of the relay terminal, the connection is disconnected without signaling.
  • the connection between the relay terminal and the remote terminal may also be disconnected for some other reasons, which is not limited in this application.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the context information of the remote terminal and/or is used to provide the remote PDU session in which the end terminal transmits data. In other words, the relay terminal continues to save or maintain the context information of the remote terminal and/or the PDU session used to transmit data for the remote terminal.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the context information of the remote terminal, so that the relay terminal can access the remote terminal from the remote terminal.
  • the context information acquires related information of the remote terminal to trigger the establishment of a connection with the remote terminal.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the PDU session used to transmit data for the remote terminal, so that the relay terminal can receive the target The downlink data of the remote terminal or the relay terminal can receive the downlink data notification message targeted for the remote terminal.
  • the context information of the remote terminal includes but is not limited to at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the Internet Protocol (IP) address assigned to the remote terminal.
  • IP Internet Protocol
  • the short-range communication terminal identifier of the remote terminal may include but is not limited to at least one of the following:
  • Network layer identification link layer identification, short-distance communication layer 2 (layer-2) address.
  • the relay terminal may determine the near field communication terminal of the remote terminal according to the downlink data targeted for the remote terminal or the downlink data notification message targeted for the remote terminal Logo.
  • the relay terminal can determine which remote terminal the data packet is sent to based on information such as the IP address, port number or IP prefix in the packet header of the downlink data, and the relay terminal according to the remote terminal's context saved by itself Information to determine the short-range communication terminal identification of the remote terminal.
  • the relay terminal sends a direct communication establishment request whose target is the remote terminal, and the direct communication establishment request is used to request the reestablishment of the connection between the relay terminal and the remote terminal.
  • Example 1 after the connection between the relay terminal and the remote terminal is disconnected, and the relay terminal receives downlink data targeted for the remote terminal or the relay terminal receives the target as In the case of the downlink data notification message of the remote terminal, the relay terminal sends a direct communication establishment request whose target is the remote terminal to reestablish the connection with the remote terminal. That is, in Example 1, the relay terminal reestablishes the connection with the remote terminal.
  • Example 1 if the relay terminal receives response information to the direct communication establishment request, it means that the connection between the relay terminal and the remote terminal has been established.
  • the direct communication establishment request may also be referred to as request information or some other name, which is not limited in this application.
  • the direct communication establishment request includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the relay terminal can carry the application layer identification of the remote terminal, the short-range communication terminal identification of the remote terminal, application information, the IP address assigned to the remote terminal, etc. in the direct communication establishment request. Information, so that the remote terminal can obtain this part of the information, thereby reestablishing the connection between the relay terminal and the remote terminal.
  • the relay terminal sends first information whose destination is the remote terminal, where the first information includes at least one of the following information for the remote terminal:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the relay terminal can carry information such as the application layer identifier of the remote terminal, the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal in the first information. , So that the remote terminal can obtain this part of information, thereby reestablishing the connection between the relay terminal and the remote terminal.
  • the relay terminal may obtain the short-range communication terminal identifier of the remote terminal from the remote terminal.
  • the relay terminal before sending the direct communication establishment request, broadcasts first discovery request information for discovering the remote terminal, and the first discovery request information includes the application layer identification and/or application of the remote terminal Information; and the relay terminal receives response information broadcast by the remote terminal for the first discovery request information, and the response information for the first discovery request information includes the short-range communication terminal identifier of the remote terminal.
  • the relay terminal broadcasts notification information to the remote device, and the notification information is used to trigger the remote terminal to initiate a connection re-establishment with the relay terminal.
  • Example 2 after the connection between the relay terminal and the remote terminal is disconnected, and the relay terminal receives downlink data targeted for the remote terminal or the relay terminal receives the targeted downlink data
  • the relay terminal broadcasts the notification information to the remote terminal, so that the remote terminal initiates a connection reestablishment with the relay terminal. That is, in Example 2, the remote terminal reestablishes the connection with the relay terminal.
  • the relay terminal receives a direct communication establishment request sent by the remote terminal, and the direct communication establishment request is used to request to reestablish a connection between the relay terminal and the remote terminal. Further, if the relay terminal sends response information to the direct communication establishment request to the remote terminal, it indicates that the connection between the relay terminal and the remote terminal has been established.
  • the direct communication establishment request may also be referred to as request information or some other name, which is not limited in this application.
  • the notification information includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, indication information used to trigger the remote terminal to establish a connection with the relay terminal, and used to associate the notification message
  • the message association identifier of the direct communication establishment request sent by the remote terminal The message association identifier of the direct communication establishment request sent by the remote terminal.
  • the relay terminal uses the application layer identification of the remote terminal and/or the application information. Or the short-distance communication terminal identifier of the remote terminal and/or the application information determines to continue to allocate the corresponding IP address stored in the remote terminal's context information to the remote terminal; or,
  • the relay terminal uses the application layer identifier of the remote terminal and/or the near field communication terminal identifier of the remote terminal in the notification message corresponding to the message association identifier and /Or the application information determines to continue to allocate the corresponding IP address stored in the context information of the remote terminal to the remote terminal.
  • the relay terminal after the connection with the remote terminal is reestablished, the relay terminal sends the downlink data to the remote terminal.
  • the remote terminal continues to maintain the context information of the remote terminal. In other words, the remote terminal continues to save or maintain the context information of the remote terminal.
  • the relay terminal determines whether the remote terminal no longer uses the relay terminal to access the network.
  • the relay terminal After the connection between the relay terminal and the remote terminal is disconnected, the relay terminal starts or restarts a timer; if the timer is in operation, the relay terminal determines that the remote terminal continues to use The relay terminal accesses the network; if the timer expires, the relay terminal determines that the remote terminal no longer uses the relay terminal to access the network.
  • the timer is started or restarted at the moment when the connection between the relay terminal and the remote terminal is disconnected, and the working duration of the timer is T. If during the working period of the timer, the relay terminal judges that the remote terminal continues to use the relay terminal to access the network; if the timer expires, the relay terminal judges that the remote terminal no longer uses the relay terminal Access the network.
  • the relay terminal after the connection between the relay terminal and the remote terminal is disconnected, the relay terminal periodically broadcasts the second discovery request information to the remote terminal; Response information, the relay terminal determines that the remote terminal continues to use the relay terminal to access the network; if the response information for the second discovery request information is not received, the relay terminal determines that the remote terminal is no longer Use this relay terminal to access the network.
  • the relay terminal receives instruction information sent by the remote terminal, where the instruction information is used to instruct the remote terminal to no longer use the relay terminal to access the network.
  • the relay terminal when the remote terminal no longer uses the relay terminal to access the network, the relay terminal deletes the context information of the remote terminal it keeps.
  • the relay terminal informs the core network that the remote terminal has left, so as to release the service for the remote terminal. PDU session in which the end terminal transmits data.
  • the relay terminal after the connection between the relay terminal and the remote terminal is disconnected, the relay terminal receives downlink data targeted to the remote terminal or the relay terminal receives data targeted to the remote terminal.
  • the relay terminal triggers the re-establishment of the connection with the remote terminal. That is, the remote terminal's opposite application server or the opposite terminal device can actively interact with the remote terminal, which expands the service usage scenarios of the remote terminal accessing the network through the relay terminal, and improves the user experience.
  • the wireless communication method according to the embodiment of the present application is described in detail above with reference to FIG. 3 from the perspective of the relay terminal, and the wireless communication method according to another embodiment of the present application is described in detail below with reference to FIG. 4 from the perspective of a remote device. It should be understood that the description on the remote terminal side and the description on the intermediate terminal side correspond to each other, and similar descriptions can be referred to above. To avoid repetition, details are not repeated here.
  • FIG. 4 is a schematic flowchart of a wireless communication method 300 according to an embodiment of the present application. As shown in FIG. 4, the method 300 may include but is not limited to the following content:
  • the remote terminal accesses the network through the relay terminal, and when the remote terminal and the relay terminal establish a PC5 connection, the remote terminal can communicate with the application server of the opposite end or other terminal equipment of the opposite end through the network. To interact.
  • the remote terminal after the connection between the relay terminal and the remote terminal is disconnected, the remote terminal reestablishes the connection with the relay terminal according to the trigger of the relay terminal. That is, the remote terminal's opposite application server or the opposite terminal device can actively interact with the remote terminal, which expands the service usage scenarios of the remote terminal accessing the network through the relay terminal, and improves the user experience.
  • connection between the relay terminal and the remote terminal may be a PC5 connection.
  • the reason for the disconnection between the relay terminal and the remote terminal may be that the remote terminal actively triggers the disconnection, or the relay terminal actively triggers the connection release, or it may be caused by wireless After the quality deteriorates or the remote terminal leaves the coverage area of the relay terminal, the connection is disconnected without signaling.
  • the connection between the relay terminal and the remote terminal may also be disconnected for some other reasons, which is not limited in this application.
  • the remote terminal in the case that the connection between the relay terminal and the remote terminal is disconnected, the remote terminal continues to maintain the context information of the remote terminal. In other words, the remote terminal continues to save or maintain the context information of the remote terminal.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the context information of the remote terminal and/or is used to provide the remote PDU session in which the end terminal transmits data. In other words, the relay terminal continues to save or maintain the context information of the remote terminal and/or the PDU session used to transmit data for the remote terminal.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the context information of the remote terminal, so that the relay terminal can access the remote terminal from the remote terminal.
  • the context information acquires related information of the remote terminal to trigger the establishment of a connection with the remote terminal.
  • the relay terminal when the connection between the relay terminal and the remote terminal is disconnected, the relay terminal continues to maintain the PDU session used to transmit data for the remote terminal, so that the relay terminal can receive the target The downlink data of the remote terminal or the relay terminal can receive the downlink data notification message targeted for the remote terminal.
  • the context information of the remote terminal includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the short-range communication terminal identifier of the remote terminal may include but is not limited to at least one of the following:
  • Network layer identification link layer identification, short-distance communication layer 2 (layer-2) address.
  • the remote terminal receives a direct communication establishment request sent by the relay terminal that targets the remote terminal, and the direct communication establishment request is used to request to reestablish the relay terminal and the remote terminal.
  • the connection between the terminals is not limited to, but not limited to, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, Wi-Fi, and the remote terminal.
  • the direct communication establishment request includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the remote terminal receives first information sent by the relay terminal that is targeted for the remote terminal, where the first information includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the method before receiving the direct communication establishment request, the method further includes:
  • the remote terminal receives first discovery request information broadcast by the relay terminal for discovering the remote terminal, where the first discovery request information includes the application layer identifier and/or application information of the remote terminal;
  • the remote terminal broadcasts response information for the first discovery request information to the relay terminal, and the response information for the first discovery request information includes the short-range communication terminal identifier of the remote terminal.
  • the remote device receives notification information broadcast by the relay terminal, and the notification information is used to trigger the remote terminal to initiate a connection re-establishment with the relay terminal; and the remote terminal The terminal sends a direct communication establishment request to the relay terminal, and the direct communication establishment request is used to request to reestablish the connection between the relay terminal and the remote terminal.
  • the notification information includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, indication information used to trigger the remote terminal to establish a connection with the relay terminal, and used to associate the notification message
  • the message association identifier of the direct communication establishment request sent by the remote terminal The message association identifier of the direct communication establishment request sent by the remote terminal.
  • the direct communication establishment request includes the application layer identifier of the remote terminal and/or the short-range communication terminal identifier of the remote terminal and/or the application information; or,
  • the direct communication establishment request includes the message association identifier, and the message association identifier is used to associate the notification information with the direct communication establishment request.
  • the remote terminal after the connection between the remote terminal and the relay terminal is reestablished, the remote terminal continues to use the corresponding IP address stored in the context information of the remote terminal.
  • the remote terminal receives downlink data targeted for the remote terminal after the connection with the relay terminal is reestablished.
  • the remote terminal sends instruction information to the relay terminal, where the instruction information is used to instruct the remote terminal to no longer use the relay terminal to access the network.
  • the remote terminal when the remote terminal no longer uses the relay terminal to access the network, the remote terminal deletes the context information of the remote terminal it keeps.
  • the remote terminal after the connection between the relay terminal and the remote terminal is disconnected, the remote terminal reestablishes the connection with the relay terminal according to the trigger of the relay terminal. That is, the remote terminal's opposite application server or the opposite terminal device can actively interact with the remote terminal, which expands the service usage scenarios of the remote terminal accessing the network through the relay terminal, and improves the user experience.
  • Embodiment 1 after the remote terminal accesses the 5G network through the relay terminal, the relay terminal saves the context information of the remote terminal. After the PC5 connection between the remote terminal and the relay terminal is disconnected, the relay terminal continues to maintain the context information of the remote terminal. After receiving the downlink data targeted for the remote terminal, the relay terminal initiates the PC5 connection re-establishment to the remote terminal. Specifically, as shown in FIG. 5, the technical solution of this embodiment is implemented based on the following steps 1101 to 1111.
  • Step 1101. The remote terminal establishes a connection with the PC5 of the relay terminal. Through this step, the relay terminal obtains the identifier of the remote terminal.
  • the identifier of the remote terminal specifically includes: the application layer user identifier of the remote terminal, and or, the network layer identifier used by the remote terminal for network routing (for example, layer-2 address information for PC5 communication), and or, Application layer information (for example, application identification or application type, etc.) that requires interactive services.
  • Step 1102. The relay terminal establishes or modifies a PDU session for transmitting service data of the remote terminal.
  • Step 1103. The relay terminal allocates IP address information for data transmission to the remote terminal, such as IP address, port number, IP prefix and other information.
  • the relay terminal saves the context information of the remote terminal, which includes the application layer identifier of the remote terminal and/or the short-range communication terminal identifier of the remote terminal.
  • the context information of the remote terminal further includes application information (application identifier or application type, etc.), and IP address information assigned to the remote terminal.
  • the near field communication terminal identifier of the remote terminal may include, but is not limited to, at least one of the following: a network layer identifier, a link layer identifier, and a near field communication layer 2 (layer-2) address.
  • Step 1105. The relay terminal sends the identification and IP address information of the remote terminal to the SMF entity of the core network, and informs the network that the remote terminal accesses the network through the relay terminal.
  • Step 1106 The PC5 connection between the remote terminal and the relay terminal is disconnected.
  • the reason for the disconnection may be that the remote terminal actively triggers the PC5 connection release, or the relay terminal actively triggers the PC5 connection release, or it may be because the wireless quality is deteriorated. Or, after the remote terminal leaves the coverage of the relay terminal, there is no implicit PC5 connection disconnection triggered by signaling.
  • the relay terminal determines that the PC5 connection with the remote terminal is disconnected, it continues to maintain the context information of the remote terminal, and continues to maintain the PDU session established in step 1102 for the remote terminal to transmit data.
  • the core network After that, if the core network receives the downlink data or downlink data notification message sent to the remote terminal, it will continue to send it to the relay terminal. For example, if the relay terminal is in the connected state, the PDU session established in step 1102 is sent to the relay terminal; if the relay terminal is in the idle state, the relay terminal first responds to the page and initiates the corresponding paging mode. The process is transformed into a connected state, and then the network sends the downlink data or downlink data notification message sent to the remote terminal to the relay terminal through the PDU session established in step 1102.
  • Step 1107 The relay terminal judges the data according to the received downlink data or downlink data notification message sent to the remote terminal. For example, the relay terminal can judge the data according to the IP address port number or IP prefix of the received downlink data packet header. To which remote terminal the packet is sent, the relay terminal determines the short-range communication terminal identifier of the remote terminal according to the context of the remote terminal saved by itself.
  • the relay terminal initiates the establishment of the PC5 connection to the remote terminal, for example, sends a direct communication establishment request whose target is the layer-2 address of the remote terminal.
  • a direct communication establishment request whose target is the layer-2 address of the remote terminal.
  • it may also include the application layer identifier of the remote terminal and Or application information and or IP address information assigned to the remote terminal in step 3. These information can be sent to the remote terminal in the direct communication establishment request message, or sent to the remote terminal through separate signaling.
  • the relay terminal may also broadcast a discovery request message, which carries the application layer identifier and or application information of the remote terminal, for remote terminal discovery.
  • the remote terminal monitors the discovery request message matching itself, it responds to the relay terminal with its own short-range communication terminal identifier.
  • the relay terminal After the PC5 connection between the relay terminal and the remote terminal is re-established, the relay terminal sends a downlink data or downlink data notification message to the remote terminal.
  • Step 1109 After the PC5 connection between the remote terminal and the relay terminal is disconnected, the relay terminal can determine whether the remote terminal no longer uses the relay terminal to access the network.
  • the judgment method includes but is not limited to the following examples: for example, a timer is set on the relay terminal, and the PC5 is started or restarted after the PC5 connection is disconnected. If the timer expires, it is considered that the remote terminal no longer uses the relay terminal to access the network.
  • the relay terminal periodically performs a broadcast discovery request from the PC5 interface to the remote terminal, and determines whether the remote terminal no longer uses the relay terminal to access the network according to whether it can receive a response message.
  • Step 1110 After the relay terminal judges that the remote terminal no longer uses the relay terminal to access the network, it deletes the remote terminal context information stored by itself.
  • Step 1111 After the relay terminal judges that the remote terminal no longer uses the relay terminal to access the network, it notifies the core network of the departure of the remote terminal to release the PDU session established in step 1102 for the remote terminal to transmit data.
  • Embodiment 2 The difference between Embodiment 2 and Embodiment 1 is that after the relay terminal receives the downlink data or downlink data notification message sent to the remote terminal, the relay terminal broadcasts the notification message, which includes the remote terminal application layer identifier and/or The application information and/or the instruction to initiate the PC5 connection inform the remote terminal to initiate the establishment of the PC5 connection to the relay terminal.
  • the technical solution of this embodiment is implemented based on the following steps 1201 to 1212.
  • the notification message in this embodiment is the same as the above notification information.
  • Steps 1201-1207 are the same as steps 1101-1107 of Embodiment 1 above.
  • Step 1208 The relay terminal broadcasts a notification message, which includes the remote terminal application layer identification and/or application information and/or an instruction to initiate a PC5 connection.
  • the notification message also includes a message association identifier. The notification message is used to notify the remote terminal to initiate the establishment of the PC5 connection to the relay terminal.
  • Step 1209 The remote terminal initiates the establishment of a PC5 connection to the relay terminal, that is, the remote terminal sends a direct communication establishment request to the relay terminal, which carries the application layer identifier of the remote terminal and/or the remote terminal included in the broadcast notification message.
  • the short-range communication terminal identifier of the remote terminal and/or the application information, or carry the message association identifier received in step 1208, and the message association identifier is used to associate the notification information with the direct communication establishment request.
  • the relay terminal determines to continue to allocate the IP address information assigned to the remote terminal in step 1203 according to the received remote terminal’s identifier and/or application information, or the relay terminal associates the identifier according to the received message It can be determined to continue to allocate the IP address information allocated to the remote terminal in step 1203 for this remote terminal.
  • the relay terminal After the PC5 connection between the relay terminal and the remote terminal is re-established, the relay terminal sends a downlink data or downlink data notification message to the remote terminal.
  • Steps 1210-1212 are the same as steps 1109-1111 of the above-mentioned embodiment 1.
  • Embodiment 3 The difference between Embodiment 3 and Embodiment 1 is that the remote terminal saves its own context information after establishing a PC5 connection with the relay terminal, which includes the application layer identifier of the remote terminal and/or the remote terminal’s proximity information.
  • Distance communication terminal identification the context information also includes application information (application identifier or application type, etc.), and IP address information allocated to the remote terminal.
  • the near field communication terminal identifier of the remote terminal may include, but is not limited to, at least one of the following: a network layer identifier, a link layer identifier, and a near field communication layer 2 (layer-2) address.
  • the relay terminal After receiving the relay terminal to initiate the establishment of the PC5 connection, it directly uses its own saved IP address. When the remote terminal needs to leave the relay terminal, it can actively send a leave notification to the relay terminal. Specifically, as shown in FIG. 7, the technical solution of this embodiment is implemented based on the following steps 1301 to 1312.
  • Steps 1301-1306 are the same as steps 1101-1106 of the above-mentioned embodiment 1.
  • Step 1307 The remote terminal continues to save its own context information after the PC5 connection is disconnected, including the application layer identifier of the remote terminal and/or the short-range communication terminal identifier of the remote terminal.
  • the context information also includes application information (application identifier or application type, etc.), and IP address information allocated to the remote terminal.
  • Step 1308 is the same as step 1107 in Embodiment 1 described above.
  • Step 1309 is the same as step 1108 in Embodiment 1, but may not include IP address information.
  • Step 1310 When the remote terminal determines that it no longer needs to access the network from the relay terminal, it sends an indication to the relay terminal that it no longer needs to access the network through the relay terminal.
  • Steps 1311-1312 are the same as steps 1110-1111 in Embodiment 1 above.
  • Embodiment 4 The difference between Embodiment 4 and Embodiment 3 is that after the relay terminal receives the downlink data or downlink data notification message sent to the remote terminal, the relay terminal broadcasts the notification message, which includes the remote terminal application layer identifier and/or The application information and/or the instruction to initiate the PC5 connection inform the remote terminal to initiate the establishment of the PC5 connection to the relay terminal.
  • the technical solution of this embodiment is implemented based on the following steps 1401 to 1413.
  • Steps 1401-1408 are the same as steps 1301-1308 in the foregoing embodiment 3; steps 1409-1410 are the same as steps 1208-1209 in the foregoing embodiment 2; and steps 1411-1413 are the same as steps 1310-1312 in the foregoing embodiment 3.
  • FIG. 9 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application.
  • the terminal device 400 is a relay terminal, and the terminal device 400 includes: a processing unit 410, where:
  • the processing unit 410 is used to trigger the reestablishment of the connection with the remote terminal.
  • the processing unit 410 is further configured to continue to maintain the context information of the remote terminal and/or to provide the remote terminal PDU session for data transmission.
  • the context information of the remote terminal includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the terminal device 400 further includes: a communication unit 420, where:
  • the communication unit 420 is configured to send a direct communication establishment request whose target is the remote terminal, and the direct communication establishment request is used to request to reestablish a connection between the relay terminal and the remote terminal.
  • the direct communication establishment request includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the terminal device 400 further includes: a communication unit 420, where:
  • the communication unit 420 is configured to send first information targeted to the remote terminal, where the first information includes at least one of the following information specific to the remote terminal:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the communication unit 420 is further configured to broadcast first discovery request information for discovering the remote terminal, where the first discovery request information includes the application layer identifier and/or application information of the remote terminal;
  • the communication unit 420 is further configured to receive response information to the first discovery request information broadcast by the remote terminal, and the response information to the first discovery request information includes the short-range communication terminal identifier of the remote terminal.
  • the terminal device 420 further includes: a communication unit 420, where:
  • the communication unit 420 is also configured to broadcast notification information to the remote device, and the notification information is used to trigger the remote terminal to initiate a connection re-establishment with the relay terminal.
  • the communication unit 420 is further configured to receive a direct communication establishment request sent by the remote terminal, where the direct communication establishment request is used to request to reestablish a connection between the relay terminal and the remote terminal.
  • the notification information includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, indication information used to trigger the remote terminal to establish a connection with the relay terminal, and used to associate the notification message
  • the message association identifier of the direct communication establishment request sent by the remote terminal The message association identifier of the direct communication establishment request sent by the remote terminal.
  • the processing unit is further configured to The application layer identifier of the remote terminal and/or the short-range communication terminal identifier of the remote terminal and/or the application information determines to continue to allocate the remote terminal to the corresponding IP address stored in the remote terminal's context information; or,
  • the processing unit is further configured to use the application layer identifier of the remote terminal and/or the near field communication terminal of the remote terminal in the notification message corresponding to the message association identifier
  • the identification and/or the application information determines to continue to allocate the corresponding IP address stored in the context information of the remote terminal to the remote terminal.
  • the terminal device 400 further includes: a communication unit 420, where:
  • the communication unit 420 is configured to send the downlink data to the remote terminal.
  • the processing unit 410 is further configured to determine whether the remote terminal no longer uses the relay terminal to access the network.
  • processing unit 410 is specifically configured to:
  • the remote terminal If during the working period of the timer, it is determined that the remote terminal continues to use the relay terminal to access the network; if the timer expires, it is determined that the remote terminal no longer uses the relay terminal to access the network.
  • the timer is pre-configured, or the timer is pre-configured or instructed by the network device, or the timer is agreed upon by the relay terminal and the remote terminal.
  • the terminal device further includes: a communication unit 420, wherein:
  • the communication unit 420 is configured to periodically broadcast the second discovery request information to the remote terminal;
  • the processing unit 410 is further configured to determine that the remote terminal continues to use the relay terminal to access the network; if the response for the second discovery request information is not received Information, the processing unit 410 is also used to determine that the remote terminal no longer uses the relay terminal to access the network.
  • the terminal device 400 further includes: a communication unit 420,
  • the communication unit 420 is configured to receive instruction information sent by the remote terminal, where the instruction information is used to instruct the remote terminal to no longer use the relay terminal to access the network.
  • the processing unit 410 is further configured to delete the context information of the remote terminal it keeps.
  • the processing unit 410 is further configured to notify the core network that the remote terminal has left, so as to release the data used for transmission to the remote terminal. Data PDU session.
  • connection between the remote terminal and the relay terminal is a PC5 connection.
  • the aforementioned communication unit may be a communication interface or a transceiver, or an input/output interface of a communication chip or a system-on-chip.
  • the aforementioned processing unit may be one or more processors.
  • terminal device 400 may correspond to the relay terminal in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the terminal device 400 are respectively intended to realize the functions shown in FIG. 3
  • the corresponding process of the relay terminal in the method 200 will not be repeated here.
  • FIG. 10 shows a schematic block diagram of a terminal device 500 according to an embodiment of the present application.
  • the terminal device 500 is a remote terminal, and the terminal device 500 includes: a processing unit 510, wherein:
  • the processing unit 510 is configured to reestablish the connection with the relay terminal according to the trigger of the relay terminal.
  • the processing unit 510 is further configured to continue to maintain the context information of the remote terminal.
  • the context information of the remote terminal includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the terminal device 500 further includes: a communication unit 520, wherein:
  • the communication unit 520 is configured to receive a direct communication establishment request sent by the relay terminal that is targeted to the remote terminal, and the direct communication establishment request is used to request to reestablish a connection between the relay terminal and the remote terminal.
  • the direct communication establishment request includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the communication unit 520 is further configured to receive first information sent by the relay terminal that is targeted to the remote terminal, where the first information includes at least one of the following:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, and the IP address assigned to the remote terminal.
  • the communication unit 520 is further configured to receive first discovery request information broadcast by the relay terminal for discovering the remote terminal, where the first discovery request information includes the application layer identifier and/or application information of the remote terminal;
  • the communication unit 520 is further configured to broadcast response information to the first discovery request information to the relay terminal, and the response information to the first discovery request information includes the short-range communication terminal identifier of the remote terminal.
  • the terminal device 500 further includes: a communication unit 520,
  • the communication unit 520 is configured to receive notification information broadcast by the relay terminal, and the notification information is used to trigger the remote terminal to initiate a connection re-establishment with the relay terminal;
  • the communication unit 520 is further configured to send a direct communication establishment request to the relay terminal, and the direct communication establishment request is used to request to reestablish the connection between the relay terminal and the remote terminal.
  • the notification information includes at least one of the following information:
  • the application layer identifier of the remote terminal the short-range communication terminal identifier of the remote terminal, application information, indication information used to trigger the remote terminal to establish a connection with the relay terminal, and used to associate the notification message
  • the message association identifier of the direct communication establishment request sent by the remote terminal The message association identifier of the direct communication establishment request sent by the remote terminal.
  • the direct communication establishment request includes the application layer identifier of the remote terminal and/or the short-range communication terminal identifier of the remote terminal and/or the application information; or,
  • the direct communication establishment request includes the message association identifier, and the message association identifier is used to associate the notification information with the direct communication establishment request.
  • processing unit 510 is further configured to continue to use the corresponding IP address stored in the context information of the remote terminal after the connection with the relay terminal is reestablished.
  • the terminal device 500 further includes: a communication unit 520,
  • the communication unit 520 is configured to receive downlink data targeted for the remote terminal after the connection with the relay terminal is reestablished.
  • the terminal device 500 further includes: a communication unit 520,
  • the communication unit 520 is configured to send instruction information to the relay terminal, where the instruction information is used to instruct the remote terminal to no longer use the relay terminal to access the network.
  • the processing unit 510 is further configured to delete the context information of the remote terminal it keeps.
  • connection between the remote terminal and the relay terminal is a PC5 connection.
  • the aforementioned communication unit may be a communication interface or a transceiver, or an input/output interface of a communication chip or a system-on-chip.
  • the aforementioned processing unit may be one or more processors.
  • terminal device 500 may correspond to the remote terminal in the method embodiment of the present application, and the foregoing and other operations and/or functions of the various units in the terminal device 500 are respectively intended to realize the functions shown in FIG. 4
  • the corresponding process of the remote terminal in the method 300 will not be repeated here.
  • FIG. 11 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application.
  • the communication device 600 shown in FIG. 11 includes a processor 610, and the processor 610 can call and run a computer program from a memory to implement the method in the embodiment of the present application.
  • the communication device 600 may further include a memory 620.
  • the processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.
  • the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.
  • the transceiver 630 may include a transmitter and a receiver.
  • the transceiver 630 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 600 may specifically be the relay terminal of the embodiment of the present application, and the communication device 600 may implement the corresponding procedures implemented by the relay terminal in each method of the embodiments of the present application. For the sake of brevity, it is not here. Go into details again.
  • the communication device 600 may specifically be a remote terminal in an embodiment of the present application, and the communication device 600 may implement the corresponding procedures implemented by the remote terminal in each method in the embodiments of the present application.
  • the communication device 600 may implement the corresponding procedures implemented by the remote terminal in each method in the embodiments of the present application.
  • the communication device 600 may implement the corresponding procedures implemented by the remote terminal in each method in the embodiments of the present application.
  • Fig. 12 is a schematic structural diagram of a device according to an embodiment of the present application.
  • the apparatus 700 shown in FIG. 12 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the apparatus 700 may further include a memory 720.
  • the processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.
  • the memory 720 may be a separate device independent of the processor 710, or may be integrated in the processor 710.
  • the device 700 may further include an input interface 730.
  • the processor 710 can control the input interface 730 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.
  • the device 700 may further include an output interface 740.
  • the processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.
  • the device can be applied to the relay terminal in the embodiments of the present application, and the device can implement the corresponding procedures implemented by the relay terminal in the various methods of the embodiments of the present application.
  • the device can implement the corresponding procedures implemented by the relay terminal in the various methods of the embodiments of the present application.
  • details are not described herein again.
  • the device can be applied to the remote terminal in the embodiments of the present application, and the device can implement the corresponding procedures implemented by the remote terminal in the various methods of the embodiments of the present application.
  • the device can implement the corresponding procedures implemented by the remote terminal in the various methods of the embodiments of the present application.
  • details are not described herein again.
  • the device mentioned in the embodiment of the present application may also be a chip.
  • it can be a system-on-chip, a system-on-chip, a system-on-chip, or a system-on-chip.
  • FIG. 13 is a schematic block diagram of a communication system 800 according to an embodiment of the present application.
  • the communication system 800 includes a remote terminal 810, a relay terminal 820, and a network device 830.
  • the remote terminal 810 can be used to implement the corresponding functions implemented by the remote terminal in the above method
  • the relay terminal 820 can be used to implement the corresponding functions implemented by the relay terminal in the above method. For brevity, This will not be repeated here.
  • the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments may be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is to say, the memory in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.
  • the embodiments of the present application also provide a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium can be applied to the relay terminal in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • the computer-readable storage medium can be applied to the remote terminal in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the remote terminal in each method of the embodiment of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the remote terminal in each method of the embodiment of the present application.
  • the embodiments of the present application also provide a computer program product, including computer program instructions.
  • the computer program product can be applied to the relay terminal in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • the computer program product can be applied to the remote terminal in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the remote terminal in each method of the embodiment of the present application.
  • the computer program instructions cause the computer to execute the corresponding process implemented by the remote terminal in each method of the embodiment of the present application.
  • the embodiment of the present application also provides a computer program.
  • the computer program can be applied to the relay terminal in the embodiment of the present application, and when the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the relay terminal in each method of the embodiment of the present application.
  • I will not repeat them here.
  • the computer program can be applied to the remote terminal in the embodiment of the present application.
  • the computer program runs on the computer, the computer executes the corresponding process implemented by the remote terminal in each method of the embodiment of the present application.
  • I will not repeat them here.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

本申请实施例提供了一种无线通信方法和终端设备，在远端终端与中继终端断开了PC5连接之后，对端的应用服务器或者对端的终端设备可以主动与远端终端交互，扩大了远端终端通过中继终端接入网络的业务使用场景。该无线通信方法包括：在中继终端与远端终端之间的连接断开之后，且该中继终端接收到目标为该远端终端的下行数据或者该中继终端接收到目标为该远端终端的下行数据通知消息的情况下，该中继终端触发重建与该远端终端之间的连接。

Description

无线通信方法和终端设备 技术领域
本申请实施例涉及通信领域，并且更具体地，涉及一种无线通信方法和终端设备。
背景技术
在新无线(New Radio，NR)系统中，具有临近业务(Proximity-based Services，ProSe)能力的终端设备可以通过PC5接口与具有ProSe能力的另外一个终端设备直接通信。当一个终端设备既可以通过第五代移动通信(The 5th Generation，5G)网络连接外部数据网络，还具有ProSe能力时，这个终端设备可以充当中继终端(relay UE)，另外一个具有ProSe能力的远端终端(remote UE)可以通过PC5接口与中继终端建立直接连接，并通过中继终端与5G网络建立的协议数据单元(Protocol Data Unit，PDU)会话与外部网络交互。然而，在远端终端与中继终端断开了PC5连接之后，对端的应用服务器或者对端的终端设备无法主动与远端终端交互，限制了远端终端通过中继终端接入网络的业务使用场景。
发明内容
本申请实施例提供了一种无线通信方法和终端设备，在远端终端与中继终端断开了PC5连接之后，对端的应用服务器或者对端的终端设备可以主动与远端终端交互，扩大了远端终端通过中继终端接入网络的业务使用场景。
第一方面，提供了一种无线通信方法，该方法包括：
在中继终端与远端终端之间的连接断开之后，且所述中继终端接收到目标为所述远端终端的下行数据或者所述中继终端接收到目标为所述远端终端的下行数据通知消息的情况下，所述中继终端触发重建与所述远端终端之间的连接。
第二方面，提供了一种无线通信方法，该方法包括：
在中继终端与远端终端之间的连接断开之后，所述远端终端根据所述中继终端的触发，重建与所述中继终端之间的连接。
第三方面，提供了一种终端设备，用于执行上述第一方面中中继终端所执行的方法。
具体地，该终端设备包括用于执行上述第一方面中中继终端所执行的方法的功能模块。
第四方面，提供了一种终端设备，用于执行上述第二方面中远端终端所执行的方法。
具体地，该网络设备包括用于执行上述第二方面中的远端终端所执行方法的功能模块。
第五方面，提供了一种终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述第一方面中中继终端所执行的方法。
第六方面，提供了一种终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，执行上述第二方面中远端终端所执行的方法。
第七方面，提供了一种装置，用于实现上述第一方面中中继终端所执行的方法和第二方面中远端终端所执行的方法。
具体地，该装置包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有该装置的设备执行如上述第一方面中中继终端所执行的方法和第二方面中远端终端所执行的方法。
第八方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序使得计算机执行上述第一方面中中继终端所执行的方法和第二方面中远端终端所执行的方法。
第九方面，提供了一种计算机程序产品，包括计算机程序指令，所述计算机程序指令使得计算机执行上述第一方面中中继终端所执行的方法和第二方面中远端终端所执行的方法。
第十方面，提供了一种计算机程序，当其在计算机上运行时，使得计算机执行上述第一方面中中继终端所执行的方法和第二方面中远端终端所执行的方法。
通过上述技术方案，在中继终端与远端终端之间的连接断开之后，且中继终端接收到目标为远端终端的下行数据或者中继终端接收到目标为远端终端的下行数据通知消息的情况下，中继终端触发重建与远端终端之间的连接。相应的，在中继终端与远端终端之间的连接断开之后，远端终端根据中继终端的触发，重建与中继终端之间的连接。从而扩大了远端终端通过中继终端接入网络的业务使用场景，提升了用户体验。
附图说明
图1是本申请实施例提供的一种通信系统架构的示意性图。
图2是本申请实施例提供的一种中继通信系统架构的示意性图。
图3是根据本申请实施例提供的一种无线通信方法的示意性流程图。
图4是根据本申请实施例提供的另一种无线通信方法的示意性流程图。
图5是根据本申请实施例提供的一种重建PC5连接的示意性流程图。
图6是根据本申请实施例提供的另一种重建PC5连接的示意性流程图。
图7是根据本申请实施例提供的再一种重建PC5连接的示意性流程图。
图8是根据本申请实施例提供的再一种重建PC5连接的示意性流程图。
图9是根据本申请实施例提供的一种终端设备的示意性框图。
图10是根据本申请实施例提供的另一种终端设备的示意性框图。
图11是根据本申请实施例提供的一种通信设备的示意性框图。
图12是根据本申请实施例提供的一种装置的示意性框图。
图13是根据本申请实施例提供的一种通信系统的示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。针对本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、新空口(New Radio，NR)系统、NR系统的演进系统、免授权频谱上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、免授权频谱上的NR(NR-based access to unlicensed spectrum，NR-U)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、下一代通信系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(Device to Device，D2D)通信，机器到机器(Machine to Machine，M2M)通信，机器类型通信(Machine Type Communication，MTC)，以及车辆间(Vehicle to Vehicle，V2V)通信等，本申请实施例也可以应用于这些通信系统。
可选地，本申请实施例中的通信系统可以应用于载波聚合(Carrier Aggregation，CA)场景，也可以应用于双连接(Dual Connectivity，DC)场景，还可以应用于独立(Standalone，SA)布网场景。
本申请实施例对应用的频谱并不限定。例如，本申请实施例可以应用于授权频谱，也可以应用于免授权频谱。
图1示例性地示出了一种本申请应用的通信系统100的示意图。如图1所示，该通信系统100主要包括终端设备(User Equipment，UE)101、接入网(Access Network，AN)设备102、接入与移动性管理功能(Access and Mobility Management Function，AMF)实体103、会话管理功能(Session Management Function，SMF)实体104、用户面功能(User Plane Function，UPF)实体105、策略控制功能(Policy Control function，PCF)实体106、统一数据管理(Unified Data Management，UDM)实体107、数据网络(Data Network，DN)108、应用功能(Application Function，AF)实体109、鉴权服务器功能(Authentication Server Function，AUSF)实体110、网络切片选择功能(Network Slice Selection Function，NSSF)实体111。
具体地，在通信系统100中，UE 101通过Uu接口与AN设备102进行接入层连接，以交互接入层消息及无线数据传输，UE 101通过N1接口与AMF实体103进行非接入层(Non-Access Stratum，NAS)连接，以交互NAS消息；AN设备102通过N2接口与AMF实体103连接，以及AN设备102通过N3接口与UPF实体105连接；多个UPF实体105之间通过N9接口连接，UPF实体105通过N6接口与DN 108连接，同时，UPF实体105通过N4接口与SMF实体104连接；SMF实体104通过N7接口与PCF实体106连接，SMF实体104通过N10接口与UDM实体107连接，SMF实体104通过N4接口控制UPF实体105，同时，SMF实体104通过N11接口与AMF实体103连接；多个AMF实体103之间通过N14接口连接，AMF实体103通过N8接口与UDM实体107连接，AMF实体103通过N12接口与AUSF实体110连接，AMF实体103通过N22接口与NSSF实体111连接，同时，AMF实体103通过N15接口与PCF实体106连接；PCF实体106通过N5接口与AF实体109连接；AUSF实体110通过N13接口与UDM实体107连接。
在通信系统100中，UDM实体107是核心网中的签约数据库，存储用户在5G网络中的签约数据。AMF实体103是核心网中的移动性管理功能，SMF实体104是核心网中的会话管理功能，AMF实体103在对UE 101进行移动性管理之外，还负责将从会话管理相关消息在UE 101和SMF实体104之间的转发。PCF实体106是核心网中的策略管理功能，负责制定对UE 101的移动性管理、会话管理、计费等相关的策略。UPF实体105是核心网中的用户面功能，通过N6接口与外部数据网络进行数据传输，通过N3接口与AN设备102进行数据传输。UE 101通过Uu口接入5G网络后，在SMF实体104的控制下建立UE 101到UPF实体105的协议数据单元(Protocol Data Unit，PDU)会话数据连接，从而进行数据传输。AMF实体103和SMF实体104分别通过N8和N10接口从UDM实体107获取用户签约数据，通过N15和N7接口从PCF实体106获取策略数据。
另外，通信系统100中还存在网络开放功能(Network Exposure Function，NEF)实体，用于与第三方应用服务器接口，在核心网节点与第三方应用之间进行信息传递。
应理解，本申请实施例中网络/系统中具有通信功能的设备可称为通信设备。
需要说明的是，上述通信系统100是以5G通信系统为例进行说明，当然，本申请也可以适用于其他3GPP通信系统，例如4G通信系统，或者未来的3GPP通信系统，本申请对此并不限定。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请实施例结合终端设备和网络设备描述了各个实施例，其中：终端设备也可以称为用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。终端设备可以是WLAN中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，NR网络中的终端设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端设备等。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
上述AN设备102可以是用于与移动设备通信的设备，AN设备102可以是WLAN中的接入点(Access Point，AP)，GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及NR网络中的基站(gNB)或者未来演进的PLMN网络中的网络设备等。
在本申请实施例中，网络设备为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(Small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
在本申请实施例中，具有ProSe能力的终端设备可以通过PC5接口与具有ProSe能力的另外一个终端设备直接通信。当一个终端设备既可以通过5G网络连接外部数据网络，还具有ProSe能力时，这个终端设备可以充当中继终端，另外一个具有ProSe能力的远端终端可以通过PC5接口与Relay UE建立直接连接，并通过远端终端与5G网络建立的PDU会话与外部网络交互。其系统架构如图2所示。如图2所示，远端终端通过PC5接口连接到中继终端，以及中继终端通过Uu接口连接下一代演进型无线接入网(Next Generation Evolutional Radio Access Network，NG-RAN)，从而连接5G核心网(5G Core Network，5GC)，5GC通过N6接口连接到应用服务器(application server，AS)。
需要说明的是，图2是以5G通信系统为例进行说明，当然，也可以适用于其他3GPP通信系统，例如4G通信系统，或者未来的3GPP通信系统，本申请对此并不限定。另外，在本申请实施例中， 图2中的应用服务器(AS)也可以是其他的终端设备或者外部公共安全互联网。
一个具有ProSe能力的远端终端通过PC5接口与中继终端建立直接连接，并通过中继终端与5G网络建立的PDU会话与外部网络交互时，因为远端终端是通过中继终端的PDU会话进行数据传输，网络侧仍然认为是中继终端接入网络进行数据传输，网络侧不单独维护远端终端的上下文，不感知远端终端和中继终端之间的PC5是连接还是断开状态。这就导致只有远端终端主动与中继终端建立了PC5连接时，才可以通过5G网络与对端的应用服务器或者对端的其他终端设备进行交互，如果远端终端与中继终端断开了PC5连接，对端的应用服务器或者对端的终端设备无法主动与远端终端交互，限制了远端终端通过中继终端接入网络的业务使用场景。例如，远端终端通过5G网络访问视频聊天应用，则远端终端对端的应用服务器为视频聊天应用服务器。又例如，远端终端通过5G网络访问浏览器，则远端终端对端的应用服务器为浏览器服务器。再例如，远端终端通过5G网络与目标终端进行交互，则远端终端对端的终端设备为目标终端。
基于上述问题，本申请提出了一种中继通信方案，中继终端在与远端终端的PC5连接断开后继续保持远端终端的上下文，当中继终端收到发送给远端终端的下行数据时，中继终端根据自身保存的远端终端的上下文，并触发远端终端和中继终端之间的PC5连接的重新建立，从而将下行数据发送给远端终端。
图3是根据本申请实施例的无线通信方法200的示意性流程图，如图3所示，该方法200可以包括但不限于如下内容：
S210，在中继终端与远端终端之间的连接断开之后，且该中继终端接收到目标为该远端终端的下行数据或者该中继终端接收到目标为该远端终端的下行数据通知消息的情况下，该中继终端触发重建与该远端终端之间的连接。
需要说明的是，远端终端通过中继终端接入网络，以及在远端终端与中继终端建立了PC5连接的情况下，远端终端可以通过网络与对端的应用服务器或者对端的其他终端设备进行交互。
在本申请实施例中，在中继终端与远端终端之间的连接断开之后，中继终端接收到目标为远端终端的下行数据或者中继终端接收到目标为远端终端的下行数据通知消息的情况下，中继终端触发重建与远端终端之间的连接。即远端终端对端的应用服务器或者对端的终端设备能够主动与远端终端交互，扩展了远端终端通过中继终端接入网络的业务使用场景，提升了用户体验。
可选地，中继终端与远端终端之间的连接可以是PC5连接。
在本申请实施例中，中继终端与远端终端之间的连接断开的原因可以是远端终端主动触发以断开连接，也可以是中继终端主动触发连接释放，还可以是因无线质量变差或者远端终端离开中继终端的覆盖范围之后且没有信令触发的连接断开。当然，中继终端与远端终端之间的连接还可以因为一些其他原因而断开，本申请对此并限定。
可选地，在本申请实施例中，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持该远端终端的上下文信息和/或用于为该远端终端传输数据的PDU会话。换句话说，该中继终端继续保存或者维护该远端终端的上下文信息和/或用于为该远端终端传输数据的PDU会话。
需要说明的是，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持该远端终端的上下文信息，从而，该中继终端可以从该远端终端的上下文信息获取该远端终端的相关信息，以触发建立与该远端终端之间的连接。另外，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持用于为该远端终端传输数据的PDU会话，从而，该中继终端可以接收目标为该远端终端的下行数据或者该中继终端可以接收到目标为该远端终端的下行数据通知消息。
可选地，在本申请实施例中，该远端终端的上下文信息包括但不限于以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的互联网协议(Internet Protocol，IP)地址。
可选地，该远端终端的近距离通信终端标识可以包括但不限于以下中的至少一种：
网络层标识，链路层标识，近距离通信层2(layer-2)地址。
可选地，在本申请实施例中，该中继终端可以根据目标为该远端终端的下行数据或者目标为该远端终端的下行数据通知消息，确定出该远端终端的近距离通信终端标识。例如，该中继终端可以根据该下行数据的数据包头的IP地址端口号或者IP前缀等信息判断数据包是发送给哪个远端终端的，以及该中继终端根据自身保存的远端终端的上下文信息，确定出远端终端的近距离通信终端标识。
可选地，作为示例1，该中继终端发送目标为该远端终端的直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
也就是说，在示例1中，在中继终端与远端终端之间的连接断开之后，且该中继终端接收到目标为该远端终端的下行数据或者该中继终端接收到目标为该远端终端的下行数据通知消息的情况下，该 中继终端发送目标为该远端终端的直接通信建立请求，以重建与该远端终端之间的连接。即在示例1中，该中继终端重建与该远端终端之间的连接。
需要说明的是，在示例1中，若该中继终端接收到针对该直接通信建立请求的响应信息，则表示该中继终端与该远端终端之间的连接已经建立。
应理解，该直接通信建立请求也可以称之为请求信息或者一些其他的名称，本申请对此并不限定。
可选地，在示例1中，该直接通信建立请求包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
也就是说，该中继终端可以在该直接通信建立请求中承载该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址等信息，以使该远端终端获取这部分信息，从而重建该中继终端与该远端终端之间的连接。
可选地，在示例1中，该中继终端发送目标为该远端终端的第一信息，其中，该第一信息包括以下针对该远端终端的信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
也就是说，该中继终端可以在该第一信息中承载该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址等信息，以使该远端终端获取这部分信息，从而重建该中继终端与该远端终端之间的连接。
可选地，在示例1中，在发送所述直接通信建立请求之前，该中继终端可以从该远端终端处获取该远端终端的近距离通信终端标识。
具体地，在发送该直接通信建立请求之前，该中继终端广播用于发现该远端终端的第一发现请求信息，该第一发现请求信息包括该远端终端的应用层标识和/或应用信息；以及该中继终端接收该远端终端广播的针对该第一发现请求信息的响应信息，针对该第一发现请求信息的响应信息包括该远端终端的近距离通信终端标识。
可选地，作为示例2，该中继终端向该远端设备广播通知信息，该通知信息用于触发该远端终端发起与该中继终端之间的连接重建。
也就是说，在示例2中，在中继终端与远端终端之间的连接断开之后，且该中继终端接收到目标为该远端终端的下行数据或者该中继终端接收到目标为该远端终端的下行数据通知消息的情况下，该中继终端向该远端终端广播通知信息，以使该远端终端发起与该中继终端之间的连接重建。即在示例2中，该远端终端重建与该中继终端之间的连接。
可选地，在示例2中，该中继终端接收该远端终端发送的直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。进一步的，该中继终端向该远端终端发送针对该直接通信建立请求的响应信息，则表示该中继终端与该远端终端之间的连接已经建立。
应理解，该直接通信建立请求也可以称之为请求信息或者一些其他的名称，本申请对此并不限定。
可选地，在示例2中，该通知信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、用于触发该远端终端建立与该中继终端之间的连接的指示信息、用于关联该通知消息与该远端终端发送的直接通信建立请求的消息关联标识。
可选地，在示例2中，
若该直接通信建立请求包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，该中继终端根据该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，确定继续为该远端终端分配该远端终端的上下文信息中保存的对应的IP地址；或者，
若该直接通信建立请求包括该消息关联标识，该中继终端根据该消息关联标识对应的该通知消息中的该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，确定继续为该远端终端分配该远端终端的上下文信息中保存的对应的IP地址。
可选地，在本申请实施例中，在与该远端终端之间的连接重建之后，该中继终端将该下行数据发送给该远端终端。
可选地，在一些实施例中，在中继终端与远端终端之间的连接断开之后，该远端终端继续保持该远端终端的上下文信息。换句话说，该远端终端继续保存或者维护该远端终端的上下文信息。
可选地，在一些实施例中，该中继终端判断该远端终端是否不再使用该中继终端接入网络。
具体例如，在该中继终端与该远端终端之间的连接断开之后，该中继终端启动或者重启定时器；若在该定时器工作期间，该中继终端判断该远端终端继续使用该中继终端接入网络；若该定时器超时， 则该中继终端判断该远端终端不再使用该中继终端接入网络。
例如，该定时器在该中继终端与该远端终端之间的连接断开的时刻启动或者重启，以及该定时器的工作时长为T。若在该定时器工作期间，该中继终端判断该远端终端继续使用该中继终端接入网络；若该定时器超时，则该中继终端判断该远端终端不再使用该中继终端接入网络。
具体又例如，在该中继终端与该远端终端之间的连接断开之后，该中继终端定期向该远端终端广播第二发现请求信息；若收到针对该第二发现请求信息的响应信息，则该中继终端判断该远端终端继续使用该中继终端接入网络；若未收到针对该第二发现请求信息的响应信息，则该中继终端判断该远端终端不再使用该中继终端接入网络。
可选地，在一些实施例中，该中继终端接收该远端终端发送的指示信息，该指示信息用于指示该远端终端不再使用该中继终端接入网络。
可选地，在一些实施例中，在该远端终端不再使用该中继终端接入网络的情况下，该中继终端删除其保持的该远端终端的上下文信息。
可选地，在一些实施例中，在该远端终端不再使用该中继终端接入网络的情况下，该中继终端通知核心网该远端终端已离开，以释放用于为该远端终端传输数据的PDU会话。
因此，在本申请实施例中，在中继终端与远端终端之间的连接断开之后，中继终端接收到目标为远端终端的下行数据或者中继终端接收到目标为远端终端的下行数据通知消息的情况下，中继终端触发重建与远端终端之间的连接。即远端终端对端的应用服务器或者对端的终端设备能够主动与远端终端交互，扩展了远端终端通过中继终端接入网络的业务使用场景，提升了用户体验。
上文结合图3，从中继终端的角度详细描述了根据本申请实施例的无线通信方法，下文结合图4，从远端设备的角度详细描述根据本申请另一实施例的无线通信方法。应理解，远端终端侧的描述与中级终端侧的描述相互对应，相似的描述可以参见上文，为避免重复，此处不再赘述。
图4是根据本申请实施例的无线通信方法300的示意性流程图，如图4所示，该方法300可以包括但不限于如下内容：
S310，在中继终端与远端终端之间的连接断开之后，该远端终端根据该中继终端的触发，重建与该中继终端之间的连接。
需要说明的是，远端终端通过中继终端接入网络，以及在远端终端与中继终端建立了PC5连接的情况下，远端终端可以通过网络与对端的应用服务器或者对端的其他终端设备进行交互。
在本申请实施例中，在中继终端与远端终端之间的连接断开之后，远端终端根据中继终端的触发，重建与中继终端之间的连接。即远端终端对端的应用服务器或者对端的终端设备能够主动与远端终端交互，扩展了远端终端通过中继终端接入网络的业务使用场景，提升了用户体验。
可选地，中继终端与远端终端之间的连接可以是PC5连接。
在本申请实施例中，中继终端与远端终端之间的连接断开的原因可以是远端终端主动触发以断开连接，也可以是中继终端主动触发连接释放，还可以是因无线质量变差或者远端终端离开中继终端的覆盖范围之后且没有信令触发的连接断开。当然，中继终端与远端终端之间的连接还可以因为一些其他原因而断开，本申请对此并限定。
可选地，在本申请实施例中，在该中继终端与该远端终端之间的连接断开的情况下，该远端终端继续保持该远端终端的上下文信息。换句话说，该远端终端继续保存或者维护该远端终端的上下文信息。
可选地，在本申请实施例中，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持该远端终端的上下文信息和/或用于为该远端终端传输数据的PDU会话。换句话说，该中继终端继续保存或者维护该远端终端的上下文信息和/或用于为该远端终端传输数据的PDU会话。
需要说明的是，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持该远端终端的上下文信息，从而，该中继终端可以从该远端终端的上下文信息获取该远端终端的相关信息，以触发建立与该远端终端之间的连接。另外，在中继终端与远端终端之间的连接断开的情况下，该中继终端继续保持用于为该远端终端传输数据的PDU会话，从而，该中继终端可以接收目标为该远端终端的下行数据或者该中继终端可以接收到目标为该远端终端的下行数据通知消息。
可选地，该远端终端的上下文信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该远端终端的近距离通信终端标识可以包括但不限于以下中的至少一种：
网络层标识，链路层标识，近距离通信层2(layer-2)地址。
可选地，在一些实施例中，该远端终端接收该中继终端发送的目标为该远端终端的直接通信建立 请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该直接通信建立请求包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该远端终端接收该中继终端发送的目标为该远端终端的第一信息，其中，该第一信息包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，在接收该直接通信建立请求之前，该方法还包括：
该远端终端接收该中继终端的广播用于发现该远端终端的第一发现请求信息，该第一发现请求信息包括该远端终端的应用层标识和/或应用信息；
该远端终端向该中继终端广播针对该第一发现请求信息的响应信息，该针对该第一发现请求信息的响应信息包括该远端终端的近距离通信终端标识。
可选地，在一些实施例中，该远端设备接收该中继终端广播的通知信息，该通知信息用于触发该远端终端发起与该中继终端之间的连接重建；以及该远端终端向该中继终端发送直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该通知信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、用于触发该远端终端建立与该中继终端之间的连接的指示信息、用于关联该通知消息与该远端终端发送的直接通信建立请求的消息关联标识。
可选地，该直接通信建立请求包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息；或者，
该直接通信建立请求包括该消息关联标识，该消息关联标识用于关联该通知信息与该直接通信建立请求。
可选地，在本申请实施例中，该远端终端在与该中继终端之间的连接重建之后，继续使用该远端终端的上下文信息中保存的对应的IP地址。
可选地，在本申请实施例中，该远端终端在与该中继终端之间的连接重建之后接收目标为该远端终端的下行数据。
可选地，在一些实施例中，该远端终端向该中继终端发送指示信息，该指示信息用于指示该远端终端不再使用该中继终端接入网络。
可选地，在一些实施例中，在该远端终端不再使用该中继终端接入网络的情况下，该远端终端删除其保持的该远端终端的上下文信息。
因此，在本申请实施例中，在中继终端与远端终端之间的连接断开之后，远端终端根据中继终端的触发，重建与中继终端之间的连接。即远端终端对端的应用服务器或者对端的终端设备能够主动与远端终端交互，扩展了远端终端通过中继终端接入网络的业务使用场景，提升了用户体验。
以下通过实施例1至实施例4详述本申请中的技术方案。
实施例1
在实施例1中，在远端终端通过中继终端接入5G网络之后，中继终端保存了远端终端的上下文信息。在远端终端与中继终端之间的PC5连接断开之后，中继终端继续保持远端终端的上下文信息。当接收到目标为远端终端的下行数据之后，中继终端向远端终端发起PC5连接重建。具体地，如图5所示，基于如下步骤1101至步骤1111实现本实施例技术方案。
步骤1101.远端终端建立与中继终端的PC5连接，通过本步骤，中继终端获取了远端终端的标识。该远端终端的标识具体包括：远端终端的应用层用户标识，和或，远端终端用于网络路由的网络层标识(例如，用于PC5通信的layer-2地址信息)，和或，需要交互业务的应用层信息(例如应用标识或者应用类型等)。
步骤1102.中继终端建立或者修改PDU会话，用于传输远端终端的业务数据。
步骤1103.中继终端为远端终端分配用于数据传输的IP地址信息，例如IP地址、端口号、IP前缀等信息。
步骤1104.中继终端保存了远端终端的上下文信息，其中包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识。可选地，远端终端的上下文信息还包括应用信息(应用标识或者应用类型等)，分配给远端终端的IP地址信息。可选地，该远端终端的近距离通信终端标识可以包括但不限于以下中的至少一种：网络层标识，链路层标识，近距离通信层2(layer-2)地址。
步骤1105.中继终端将远端终端的标识及IP地址信息发送到核心网的SMF实体，通知网络远端终端通过中继终端接入网络。
步骤1106.远端终端与中继终端之间的PC5连接断开，断开的原因可能是远端终端主动触发，也可以是中继终端主动触发PC5连接释放，也可以是因为无线质量变差或者远端终端离开中继终端的覆盖范围后没有信令触发的隐式PC5连接断开。中继终端判断与远端终端的PC5连接断开后继续保持远端终端的上下文信息，以及继续保持步骤1102中为远端终端传输数据建立的PDU会话。
在此之后，核心网如果收到发送给远端终端的下行数据或者下行数据通知消息，也还是会继续发送到中继终端。例如，如果中继终端在连接态，则通过步骤1102建立的PDU会话发送给中继终端；如果中继终端在空闲态，则先通过寻呼的方式，使中继终端响应寻呼并发起相应流程转化为连接态，然后网络将发送给远端终端的下行数据或者下行数据通知消息通过步骤1102建立的PDU会话发送给中继终端。
步骤1107.中继终端根据收到的发送给远端终端的下行数据或者下行数据通知消息，例如中继终端可以根据收到的下行数据的数据包头的IP地址端口号或者IP前缀等信息判断数据包是发送给哪个远端终端的，中继终端根据自身保存的远端终端的上下文，确定出该远端终端的近距离通信终端标识。
步骤1108.中继终端向远端终端发起PC5连接的建立，例如发送目标为远端终端的layer-2地址的直接通信建立请求，可选的，其中还可以包括远端终端的应用层标识和或应用信息和或步骤3中分配给远端终端的IP地址信息，这些信息可以是在直接通信建立请求消息中发送给远端终端，也可以是通过单独的信令发送给远端终端的。
可选地，在中继终端向远端终端发起PC5连接的建立之前，中继终端还可以广播发现请求消息，其中携带远端终端的应用层标识和或应用信息，进行远端终端的发现。远端终端监听到与自己匹配的发现请求消息后，向中继终端回应自己的近距离通信终端标识。
在中继终端与远端终端之间的PC5连接重新建立之后，中继终端将下行数据或者下行数据通知消息发送给远端终端。
步骤1109.在远端终端与中继终端之间的PC5连接断开之后，中继终端可以判断远端终端是否不再使用中继终端接入网络。判断的方法包括并不限于一下举例：例如中继终端上设置一个定时器，PC5连接断开后启动或者重启定时器，定时器超时则认为远端终端不再使用该中继终端接入网络。又例如，中继终端定期进行PC5接口对远端终端的广播发现请求，根据是否能收到回应消息判断远端终端是否不再使用该中继终端接入网络。
步骤1110.中继终端判断远端终端不再使用该中继终端接入网络之后，删除自身保存的远端终端上下文信息。
步骤1111.中继终端判断远端终端不再使用该中继终端接入网络之后，通知核心网远端终端的离开，以释放步骤1102中为远端终端传输数据建立的PDU会话。
实施例2
实施例2与实施例1不同之处在于，中继终端收到发送给远端终端的下行数据或者下行数据通知消息之后，中继终端广播通知消息，其中包括远端终端应用层标识和/或应用信息和/或发起PC5连接的指示，通知远端终端向中继终端发起PC5连接的建立。具体地，如图6所示，基于如下步骤1201至步骤1212实现本实施例技术方案。另外，本实施例中的通知消息同上述通知信息。
步骤1201-1207如同上述实施例1步骤1101-1107。
步骤1208.中继终端广播通知消息，其中包括远端终端应用层标识和/或应用信息和/或发起PC5连接的指示。可选地，该通知消息还包括消息关联标识。该通知消息用于通知远端终端向中继终端发起PC5连接的建立。
步骤1209.远端终端向中继终端发起PC5连接的建立，即远端终端向中继终端发送直接通信建立请求，其中携带广播通知消息中包括的该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，或者，携带步骤1208中收到的消息关联标识，该消息关联标识用于关联该通知信息与该直接通信建立请求。中继终端根据收到的远端终端的标识和/或应用信息确定继续为这个远端终端分配步骤1203中分配给远端终端的IP地址信息，或者，中继终端根据收到的消息关联标识可以确定继续为这个远端终端分配步骤1203中分配给远端终端的IP地址信息。
在中继终端与远端终端之间的PC5连接重新建立之后，中继终端将下行数据或者下行数据通知消息发送给远端终端。
步骤1210-1212如同上述实施例1步骤1109-1111。
实施例3
实施例3与实施例1不同之处在于，远端终端在与中继终端建立PC5连接之后保存了自身的上下 文信息，其中包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识。可选地，该上下文信息还包括应用信息(应用标识或者应用类型等)，分配给远端终端的IP地址信息。可选地，该远端终端的近距离通信终端标识可以包括但不限于以下中的至少一种：网络层标识，链路层标识，近距离通信层2(layer-2)地址。在PC5连接断开之后，远端终端继续保存自身的上下文信息。在收到中继终端发起PC5连接的建立后，直接使用自身保存的IP地址。当远端终端需要离开中继终端时，可以主动向中继终端发送离开通知。具体地，如图7所示，基于如下步骤1301至步骤1312实现本实施例技术方案。
步骤1301-1306如同上述实施例1步骤1101-1106。
步骤1307.远端终端在PC5连接断开之后继续保存自身的上下文信息，其中包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识。可选地，该上下文信息还包括应用信息(应用标识或者应用类型等)，分配给远端终端的IP地址信息。
步骤1308如上述同实施例1中的步骤1107。
步骤1309如上述同实施例1中的步骤1108，但是可以不包括IP地址信息。
步骤1310.远端终端在确定不再需要从中继终端接入网络时，向中继终端发送不再通过中继终端接入网络指示。
步骤1311-1312如同上述实施例1中的步骤1110-1111。
实施例4
实施例4与实施例3不同之处在于，中继终端收到发送给远端终端的下行数据或者下行数据通知消息之后，中继终端广播通知消息，其中包括远端终端应用层标识和/或应用信息和/或发起PC5连接的指示，通知远端终端向中继终端发起PC5连接的建立。具体地，如图8所示，基于如下步骤1401至步骤1413实现本实施例技术方案。
步骤1401-1408如同上述实施例3中的步骤1301-1308；步骤1409-1410如同上述实施例2中的步骤1208-1209；步骤1411-1413如同上述实施例3中的步骤1310-1312。
上文结合图3至图8，详细描述了本申请的方法实施例，下文结合图9至图13，详细描述本申请的装置实施例，应理解，装置实施例与方法实施例相互对应，类似的描述可以参照方法实施例。
图9示出了根据本申请实施例的终端设备400的示意性框图。如图9所示，该终端设备400为中继终端，该终端设备400包括：处理单元410，其中，
在中继终端与远端终端之间的连接断开之后，且该中继终端接收到目标为该远端终端的下行数据或者该中继终端接收到目标为该远端终端的下行数据通知消息的情况下，该处理单元410用于触发重建与该远端终端之间的连接。
可选地，在该中继终端与该远端终端之间的连接断开的情况下，该处理单元410还用于继续保持该远端终端的上下文信息和/或用于为该远端终端传输数据的PDU会话。
可选地，该远端终端的上下文信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该终端设备400还包括：通信单元420，其中，
该通信单元420用于发送目标为该远端终端的直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该直接通信建立请求包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该终端设备400还包括：通信单元420，其中，
该通信单元420用于发送目标为该远端终端的第一信息，其中，该第一信息包括以下针对该远端终端的信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，在该通信单元420发送该直接通信建立请求之前，
该通信单元420还用于广播用于发现该远端终端的第一发现请求信息，该第一发现请求信息包括该远端终端的应用层标识和/或应用信息；
该通信单元420还用于接收该远端终端广播的针对该第一发现请求信息的响应信息，该针对该第一发现请求信息的响应信息包括该远端终端的近距离通信终端标识。
可选地，该终端设备420还包括：通信单元420，其中，
该通信单元420还用于向该远端设备广播通知信息，该通知信息用于触发该远端终端发起与该中继终端之间的连接重建。
可选地，该通信单元420还用于接收该远端终端发送的直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该通知信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、用于触发该远端终端建立与该中继终端之间的连接的指示信息、用于关联该通知消息与该远端终端发送的直接通信建立请求的消息关联标识。
可选地，若该直接通信建立请求包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，该处理单元还用于根据该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，确定继续为该远端终端分配该远端终端的上下文信息中保存的对应的IP地址；或者，
若该直接通信建立请求包括该消息关联标识，该处理单元还用于根据该消息关联标识对应的该通知消息中的该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息，确定继续为该远端终端分配该远端终端的上下文信息中保存的对应的IP地址。
可选地，该终端设备400还包括：通信单元420，其中，
在与该远端终端之间的连接重建之后，该通信单元420用于将该下行数据发送给该远端终端。
可选地，该处理单元410还用于判断该远端终端是否不再使用该中继终端接入网络。
可选地，该处理单元410具体用于：
在该中继终端与该远端终端之间的连接断开之后，启动或者重启定时器；
若在该定时器工作期间，判断该远端终端继续使用该中继终端接入网络；若该定时器超时，则判断该远端终端不再使用该中继终端接入网络。
可选地，该定时器为预配置的，或者，该定时器为网络设备预先配置或者指示的，或者，该定时器为该中继终端与该远端终端约定的。
可选地，该终端设备还包括：通信单元420，其中，
在该中继终端与该远端终端之间的连接断开之后，该通信单元420用于定期向该远端终端广播第二发现请求信息；
若收到针对该第二发现请求信息的响应信息，则该处理单元410还用于判断该远端终端继续使用该中继终端接入网络；若未收到针对该第二发现请求信息的响应信息，则该处理单元410还用于判断该远端终端不再使用该中继终端接入网络。
可选地，该终端设备400还包括：通信单元420，
该通信单元420用于接收该远端终端发送的指示信息，该指示信息用于指示该远端终端不再使用该中继终端接入网络。
可选地，在该远端终端不再使用该中继终端接入网络的情况下，该处理单元410还用于删除其保持的该远端终端的上下文信息。
可选地，在该远端终端不再使用该中继终端接入网络的情况下，该处理单元410还用于通知核心网该远端终端已离开，以释放用于为该远端终端传输数据的PDU会话。
可选地，该远端终端与该中继终端之间的连接为PC5连接。
可选地，在一些实施例中，上述通信单元可以是通信接口或收发器，或者是通信芯片或者片上系统的输入输出接口。上述处理单元可以是一个或多个处理器。
应理解，根据本申请实施例的终端设备400可对应于本申请方法实施例中的中继终端，并且终端设备400中的各个单元的上述和其它操作和/或功能分别为了实现图3所示方法200中中继终端的相应流程，为了简洁，在此不再赘述。
图10示出了根据本申请实施例的终端设备500的示意性框图。如图10所示，该终端设备500为远端终端，该终端设备500包括：处理单元510，其中，
在中继终端与远端终端之间的连接断开之后，该处理单元510用于根据该中继终端的触发，重建与该中继终端之间的连接。
可选地，在该中继终端与该远端终端之间的连接断开的情况下，该处理单元510还用于继续保持该远端终端的上下文信息。
可选地，该远端终端的上下文信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该终端设备500还包括：通信单元520，其中，
该通信单元520用于接收该中继终端发送的目标为该远端终端的直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该直接通信建立请求包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，该通信单元520还用于接收该中继终端发送的目标为该远端终端的第一信息，其中，该第一信息包括以下中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、分配给该远端终端的IP地址。
可选地，在该通信单元520接收该直接通信建立请求之前，
该通信单元520还用于接收该中继终端的广播用于发现该远端终端的第一发现请求信息，该第一发现请求信息包括该远端终端的应用层标识和/或应用信息；
该通信单元520还用于向该中继终端广播针对该第一发现请求信息的响应信息，该针对该第一发现请求信息的响应信息包括该远端终端的近距离通信终端标识。
可选地，该终端设备500还包括：通信单元520，
该通信单元520用于接收该中继终端广播的通知信息，该通知信息用于触发该远端终端发起与该中继终端之间的连接重建；
该通信单元520还用于向该中继终端发送直接通信建立请求，该直接通信建立请求用于请求重建该中继终端与该远端终端之间的连接。
可选地，该通知信息包括以下信息中的至少一种：
该远端终端的应用层标识、该远端终端的近距离通信终端标识、应用信息、用于触发该远端终端建立与该中继终端之间的连接的指示信息、用于关联该通知消息与该远端终端发送的直接通信建立请求的消息关联标识。
可选地，该直接通信建立请求包括该远端终端的应用层标识和/或该远端终端的近距离通信终端标识和/或该应用信息；或者，
该直接通信建立请求包括该消息关联标识，该消息关联标识用于关联所述通知信息与所述直接通信建立请求。
可选地，该处理单元510还用于在与该中继终端之间的连接重建之后，继续使用该远端终端的上下文信息中保存的对应的IP地址。
可选地，该终端设备500还包括：通信单元520，
该通信单元520用于在与该中继终端之间的连接重建之后接收目标为该远端终端的下行数据。
可选地，该终端设备500还包括：通信单元520，
该通信单元520用于向该中继终端发送指示信息，该指示信息用于指示该远端终端不再使用该中继终端接入网络。
可选地，在该远端终端不再使用该中继终端接入网络的情况下，该处理单元510还用于删除其保持的该远端终端的上下文信息。
可选地，该远端终端与该中继终端之间的连接为PC5连接。
可选地，在一些实施例中，上述通信单元可以是通信接口或收发器，或者是通信芯片或者片上系统的输入输出接口。上述处理单元可以是一个或多个处理器。
应理解，根据本申请实施例的终端设备500可对应于本申请方法实施例中的远端终端，并且终端设备500中的各个单元的上述和其它操作和/或功能分别为了实现图4所示方法300中远端终端的相应流程，为了简洁，在此不再赘述。
图11是本申请实施例提供的一种通信设备600示意性结构图。图11所示的通信设备600包括处理器610，处理器610可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图11所示，通信设备600还可以包括存储器620。其中，处理器610可以从存储器620中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器620可以是独立于处理器610的一个单独的器件，也可以集成在处理器610中。
可选地，如图11所示，通信设备600还可以包括收发器630，处理器610可以控制该收发器630与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器630可以包括发射机和接收机。收发器630还可以进一步包括天线，天线的数量可以为一个或多个。
可选地，该通信设备600具体可为本申请实施例的中继终端，并且该通信设备600可以实现本申请实施例的各个方法中由中继终端实现的相应流程，为了简洁，在此不再赘述。
可选地，该通信设备600具体可为本申请实施例的远端终端，并且该通信设备600可以实现本申请实施例的各个方法中由远端终端实现的相应流程，为了简洁，在此不再赘述。
图12是本申请实施例的装置的示意性结构图。图12所示的装置700包括处理器710，处理器710可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
可选地，如图12所示，装置700还可以包括存储器720。其中，处理器710可以从存储器720中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器720可以是独立于处理器710的一个单独的器件，也可以集成在处理器710中。
可选地，该装置700还可以包括输入接口730。其中，处理器710可以控制该输入接口730与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
可选地，该装置700还可以包括输出接口740。其中，处理器710可以控制该输出接口740与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
可选地，该装置可应用于本申请实施例中的中继终端，并且该装置可以实现本申请实施例的各个方法中由中继终端实现的相应流程，为了简洁，在此不再赘述。
可选地，该装置可应用于本申请实施例中的远端终端，并且该装置可以实现本申请实施例的各个方法中由远端终端实现的相应流程，为了简洁，在此不再赘述。
可选地，本申请实施例提到的装置也可以是芯片。例如可以是系统级芯片，系统芯片，芯片系统或片上系统芯片等。
图13是本申请实施例提供的一种通信系统800的示意性框图。如图13所示，该通信系统800包括远端终端810、中继终端820和网络设备830。
其中，该远端终端810可以用于实现上述方法中由远端终端实现的相应的功能，以及该中继终端820可以用于实现上述方法中由中继终端实现的相应的功能为了简洁，在此不再赘述。
应理解，本申请实施例的处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提供了一种计算机可读存储介质，用于存储计算机程序。
可选地，该计算机可读存储介质可应用于本申请实施例中的中继终端，并且该计算机程序使得计算机执行本申请实施例的各个方法中由中继终端实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机可读存储介质可应用于本申请实施例中的远端终端，并且该计算机程序使得计算机执行本申请实施例的各个方法中由远端终端实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序产品，包括计算机程序指令。
可选的，该计算机程序产品可应用于本申请实施例中的中继终端，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由中继终端实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序产品可应用于本申请实施例中的远端终端，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由远端终端实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序。
可选的，该计算机程序可应用于本申请实施例中的中继终端，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由中继终端实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序可应用于本申请实施例中的远端终端，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由远端终端实现的相应流程，为了简洁，在此不再赘述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。针对这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (80)

  1. 一种无线通信方法，其特征在于，包括：
    在中继终端与远端终端之间的连接断开之后，且所述中继终端接收到目标为所述远端终端的下行数据或者所述中继终端接收到目标为所述远端终端的下行数据通知消息的情况下，所述中继终端触发重建与所述远端终端之间的连接。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    在所述中继终端与所述远端终端之间的连接断开的情况下，所述中继终端继续保持所述远端终端的上下文信息和/或用于为所述远端终端传输数据的协议数据单元PDU会话。
  3. 根据权利要求2所述的方法，其特征在于，所述远端终端的上下文信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述中继终端触发重建与所述远端终端之间的连接，包括：
    所述中继终端发送目标为所述远端终端的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  5. 根据权利要求4所述的方法，其特征在于，所述直接通信建立请求包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  6. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    所述中继终端发送目标为所述远端终端的第一信息，其中，所述第一信息包括以下针对所述远端终端的信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  7. 根据权利要求4至6中任一项所述的方法，其特征在于，在发送所述直接通信建立请求之前，所述方法还包括：
    所述中继终端广播用于发现所述远端终端的第一发现请求信息，所述第一发现请求信息包括所述远端终端的应用层标识和/或应用信息；
    所述中继终端接收所述远端终端广播的针对所述第一发现请求信息的响应信息，所述针对所述第一发现请求信息的响应信息包括所述远端终端的近距离通信终端标识。
  8. 根据权利要求1至3中任一项所述的方法，其特征在于，所述中继终端触发重建与所述远端终端之间的连接，包括：
    所述中继终端向所述远端设备广播通知信息，所述通知信息用于触发所述远端终端发起与所述中继终端之间的连接重建。
  9. 根据权利要求8所述的方法，其特征在于，所述方法还包括：
    所述中继终端接收所述远端终端发送的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  10. 根据权利要求9所述的方法，其特征在于，所述通知信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、用于触发所述远端终端建立与所述中继终端之间的连接的指示信息、用于关联所述通知消息与所述远端终端发送的直接通信建立请求的消息关联标识。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    若所述直接通信建立请求包括所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，所述中继终端根据所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，确定继续为所述远端终端分配所述远端终端的上下文信息中保存的对应的IP地址；或者，
    若所述直接通信建立请求包括所述消息关联标识，所述中继终端根据所述消息关联标识对应的所述通知消息中的所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，确定继续为所述远端终端分配所述远端终端的上下文信息中保存的对应的IP地址。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，所述方法还包括：
    在与所述远端终端之间的连接重建之后，所述中继终端将所述下行数据发送给所述远端终端。
  13. 根据权利要求1至12中任一项所述的方法，其特征在于，所述方法还包括：
    所述中继终端判断所述远端终端是否不再使用所述中继终端接入网络。
  14. 根据权利要求13所述的方法，其特征在于，所述中继终端判断所述远端终端是否不再使用所述中继终端接入网络，包括：
    在所述中继终端与所述远端终端之间的连接断开之后，所述中继终端启动或者重启定时器；
    若在所述定时器工作期间，所述中继终端判断所述远端终端继续使用所述中继终端接入网络；若所述定时器超时，则所述中继终端判断所述远端终端不再使用所述中继终端接入网络。
  15. 根据权利要求14所述的方法，其特征在于，所述定时器为预配置的，或者，所述定时器为网络设备预先配置或者指示的，或者，所述定时器为所述中继终端与所述远端终端约定的。
  16. 根据权利要求13所述的方法，其特征在于，所述中继终端判断所述远端终端是否不再使用所述中继终端接入网络，包括：
    在所述中继终端与所述远端终端之间的连接断开之后，所述中继终端定期向所述远端终端广播第二发现请求信息；
    若收到针对所述第二发现请求信息的响应信息，则所述中继终端判断所述远端终端继续使用所述中继终端接入网络；若未收到针对所述第二发现请求信息的响应信息，则所述中继终端判断所述远端终端不再使用所述中继终端接入网络。
  17. 根据权利要求1至13中任一项所述的方法，其特征在于，所述方法还包括：
    所述中继终端接收所述远端终端发送的指示信息，所述指示信息用于指示所述远端终端不再使用所述中继终端接入网络。
  18. 根据权利要求13至17中任一项所述的方法，其特征在于，所述方法还包括：
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述中继终端删除其保持的所述远端终端的上下文信息。
  19. 根据权利要求13至18中任一项所述的方法，其特征在于，所述方法还包括：
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述中继终端通知核心网所述远端终端已离开，以释放用于为所述远端终端传输数据的PDU会话。
  20. 根据权利要求1至19中任一项所述的方法，其特征在于，所述远端终端与所述中继终端之间的连接为PC5连接。
  21. 一种无线通信方法，其特征在于，包括：
    在中继终端与远端终端之间的连接断开之后，所述远端终端根据所述中继终端的触发，重建与所述中继终端之间的连接。
  22. 根据权利要求21所述的方法，其特征在于，所述方法还包括：
    在所述中继终端与所述远端终端之间的连接断开的情况下，所述远端终端继续保持所述远端终端的上下文信息。
  23. 根据权利要求22所述的方法，其特征在于，所述远端终端的上下文信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  24. 根据权利要求21至23中任一项所述的方法，其特征在于，所述远端终端根据所述中继终端的触发，重建与所述中继终端之间的连接，包括：
    所述远端终端接收所述中继终端发送的目标为所述远端终端的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  25. 根据权利要求24所述的方法，其特征在于，所述直接通信建立请求包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  26. 根据权利要求24所述的方法，其特征在于，所述方法还包括：
    所述远端终端接收所述中继终端发送的目标为所述远端终端的第一信息，其中，所述第一信息包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  27. 根据权利要求24至26中任一项所述的方法，其特征在于，在接收所述直接通信建立请求之前，所述方法还包括：
    所述远端终端接收所述中继终端的广播用于发现所述远端终端的第一发现请求信息，所述第一发现请求信息包括所述远端终端的应用层标识和/或应用信息；
    所述远端终端向所述中继终端广播针对所述第一发现请求信息的响应信息，所述针对所述第一发现请求信息的响应信息包括所述远端终端的近距离通信终端标识。
  28. 根据权利要求21至23中任一项所述的方法，其特征在于，所述远端终端根据所述中继终端的触发，重建与所述中继终端之间的连接，包括：
    所述远端设备接收所述中继终端广播的通知信息，所述通知信息用于触发所述远端终端发起与所述中继终端之间的连接重建；
    所述远端终端向所述中继终端发送直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  29. 根据权利要求28所述的方法，其特征在于，所述通知信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、用于触发所述远端终端建立与所述中继终端之间的连接的指示信息、用于关联所述通知消息与所述远端终端发送的直接通信建立请求的消息关联标识。
  30. 根据权利要求28或29所述的方法，其特征在于，
    所述直接通信建立请求包括所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息；或者，
    所述直接通信建立请求包括所述消息关联标识，所述消息关联标识用于关联所述通知信息与所述直接通信建立请求。
  31. 根据权利要求24至30中任一项所述的方法，其特征在于，所述方法还包括：
    所述远端终端在与所述中继终端之间的连接重建之后，继续使用所述远端终端的上下文信息中保存的对应的IP地址。
  32. 根据权利要求21至31中任一项所述的方法，其特征在于，所述方法还包括：
    所述远端终端在与所述中继终端之间的连接重建之后接收目标为所述远端终端的下行数据。
  33. 根据权利要求21至32中任一项所述的方法，其特征在于，所述方法还包括：
    所述远端终端向所述中继终端发送指示信息，所述指示信息用于指示所述远端终端不再使用所述中继终端接入网络。
  34. 根据权利要求21至33中任一项所述的方法，其特征在于，所述方法还包括：
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述远端终端删除其保持的所述远端终端的上下文信息。
  35. 根据权利要求21至34中任一项所述的方法，其特征在于，所述远端终端与所述中继终端之间的连接为PC5连接。
  36. 一种终端设备，其特征在于，所述终端设备为中继终端，所述终端设备包括：处理单元，在中继终端与远端终端之间的连接断开之后，且所述中继终端接收到目标为所述远端终端的下行数据或者所述中继终端接收到目标为所述远端终端的下行数据通知消息的情况下，所述处理单元用于触发重建与所述远端终端之间的连接。
  37. 根据权利要求36所述的终端设备，其特征在于，
    在所述中继终端与所述远端终端之间的连接断开的情况下，所述处理单元还用于继续保持所述远端终端的上下文信息和/或用于为所述远端终端传输数据的协议数据单元PDU会话。
  38. 根据权利要求37所述的终端设备，其特征在于，所述远端终端的上下文信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  39. 根据权利要求36至38中任一项所述的终端设备，其特征在于，所述终端设备还包括通信单元，
    所述通信单元用于发送目标为所述远端终端的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  40. 根据权利要求39所述的终端设备，其特征在于，所述直接通信建立请求包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  41. 根据权利要求39所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    所述通信单元用于发送目标为所述远端终端的第一信息，其中，所述第一信息包括以下针对所述远端终端的信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  42. 根据权利要求39至41中任一项所述的终端设备，其特征在于，在所述通信单元发送所述直接通信建立请求之前，
    所述通信单元还用于广播用于发现所述远端终端的第一发现请求信息，所述第一发现请求信息包括所述远端终端的应用层标识和/或应用信息；
    所述通信单元还用于接收所述远端终端广播的针对所述第一发现请求信息的响应信息，所述针对所述第一发现请求信息的响应信息包括所述远端终端的近距离通信终端标识。
  43. 根据权利要求36至38中任一项所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    所述通信单元还用于向所述远端设备广播通知信息，所述通知信息用于触发所述远端终端发起与所述中继终端之间的连接重建。
  44. 根据权利要求43所述的终端设备，其特征在于，
    所述通信单元还用于接收所述远端终端发送的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  45. 根据权利要求44所述的终端设备，其特征在于，所述通知信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、用于触发所述远端终端建立与所述中继终端之间的连接的指示信息、用于关联所述通知消息与所述远端终端发送的直接通信建立请求的消息关联标识。
  46. 根据权利要求45所述的终端设备，其特征在于，
    若所述直接通信建立请求包括所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，所述处理单元还用于根据所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，确定继续为所述远端终端分配所述远端终端的上下文信息中保存的对应的IP地址；或者，
    若所述直接通信建立请求包括所述消息关联标识，所述处理单元还用于根据所述消息关联标识对应的所述通知消息中的所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息，确定继续为所述远端终端分配所述远端终端的上下文信息中保存的对应的IP地址。
  47. 根据权利要求36至46中任一项所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    在与所述远端终端之间的连接重建之后，所述通信单元用于将所述下行数据发送给所述远端终端。
  48. 根据权利要求36至47中任一项所述的终端设备，其特征在于，
    所述处理单元还用于判断所述远端终端是否不再使用所述中继终端接入网络。
  49. 根据权利要求48所述的终端设备，其特征在于，所述处理单元具体用于：
    在所述中继终端与所述远端终端之间的连接断开之后，启动或者重启定时器；
    若在所述定时器工作期间，判断所述远端终端继续使用所述中继终端接入网络；若所述定时器超时，则判断所述远端终端不再使用所述中继终端接入网络。
  50. 根据权利要求49所述的终端设备，其特征在于，所述定时器为预配置的，或者，所述定时器为网络设备预先配置或者指示的，或者，所述定时器为所述中继终端与所述远端终端约定的。
  51. 根据权利要求48所述的终端设备，其特征在于，所述终端设备还包括通信单元，
    在所述中继终端与所述远端终端之间的连接断开之后，所述通信单元用于定期向所述远端终端广播第二发现请求信息；
    若收到针对所述第二发现请求信息的响应信息，则所述处理单元还用于判断所述远端终端继续使用所述中继终端接入网络；若未收到针对所述第二发现请求信息的响应信息，则所述处理单元还用于判断所述远端终端不再使用所述中继终端接入网络。
  52. 根据权利要求36至48中任一项所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    所述通信单元用于接收所述远端终端发送的指示信息，所述指示信息用于指示所述远端终端不再使用所述中继终端接入网络。
  53. 根据权利要求48至52中任一项所述的终端设备，其特征在于，
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述处理单元还用于删除其保持的所述远端终端的上下文信息。
  54. 根据权利要求48至53中任一项所述的终端设备，其特征在于，
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述处理单元还用于通知核心网所述远端终端已离开，以释放用于为所述远端终端传输数据的PDU会话。
  55. 根据权利要求36至54中任一项所述的终端设备，其特征在于，所述远端终端与所述中继终端之间的连接为PC5连接。
  56. 一种终端设备，其特征在于，所述终端设备为远端终端，所述终端设备包括：处理单元，在中继终端与远端终端之间的连接断开之后，所述处理单元用于根据所述中继终端的触发，重建与所述中继终端之间的连接。
  57. 根据权利要求56所述的终端设备，其特征在于，
    在所述中继终端与所述远端终端之间的连接断开的情况下，所述处理单元还用于继续保持所述远端终端的上下文信息。
  58. 根据权利要求57所述的终端设备，其特征在于，所述远端终端的上下文信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  59. 根据权利要求56至58中任一项所述的终端设备，其特征在于，
    所述终端设备还包括：通信单元，
    所述通信单元用于接收所述中继终端发送的目标为所述远端终端的直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  60. 根据权利要求59所述的终端设备，其特征在于，所述直接通信建立请求包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的互联网协议IP地址。
  61. 根据权利要求59所述的终端设备，其特征在于，
    所述通信单元还用于接收所述中继终端发送的目标为所述远端终端的第一信息，其中，所述第一信息包括以下中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、分配给所述远端终端的IP地址。
  62. 根据权利要求59至61中任一项所述的终端设备，其特征在于，在所述通信单元接收所述直接通信建立请求之前，
    所述通信单元还用于接收所述中继终端的广播用于发现所述远端终端的第一发现请求信息，所述第一发现请求信息包括所述远端终端的应用层标识和/或应用信息；
    所述通信单元还用于向所述中继终端广播针对所述第一发现请求信息的响应信息，所述针对所述第一发现请求信息的响应信息包括所述远端终端的近距离通信终端标识。
  63. 根据权利要求56至58中任一项所述的终端设备，其特征在于，
    所述终端设备还包括：通信单元，
    所述通信单元用于接收所述中继终端广播的通知信息，所述通知信息用于触发所述远端终端发起与所述中继终端之间的连接重建；
    所述通信单元还用于向所述中继终端发送直接通信建立请求，所述直接通信建立请求用于请求重建所述中继终端与所述远端终端之间的连接。
  64. 根据权利要求63所述的终端设备，其特征在于，所述通知信息包括以下信息中的至少一种：
    所述远端终端的应用层标识、所述远端终端的近距离通信终端标识、应用信息、用于触发所述远端终端建立与所述中继终端之间的连接的指示信息、用于关联所述通知消息与所述远端终端发送的直接通信建立请求的消息关联标识。
  65. 根据权利要求63或64所述的终端设备，其特征在于，
    所述直接通信建立请求包括所述远端终端的应用层标识和/或所述远端终端的近距离通信终端标识和/或所述应用信息；或者，
    所述直接通信建立请求包括所述消息关联标识，所述消息关联标识用于关联所述通知信息与所述直接通信建立请求。
  66. 根据权利要求59至65中任一项所述的终端设备，其特征在于，
    所述处理单元还用于在与所述中继终端之间的连接重建之后，继续使用所述远端终端的上下文信息中保存的对应的IP地址。
  67. 根据权利要求56至66中任一项所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    所述通信单元用于在与所述中继终端之间的连接重建之后接收目标为所述远端终端的下行数据。
  68. 根据权利要求56至67中任一项所述的终端设备，其特征在于，所述终端设备还包括：通信单元，
    所述通信单元用于向所述中继终端发送指示信息，所述指示信息用于指示所述远端终端不再使用所述中继终端接入网络。
  69. 根据权利要求56至68中任一项所述的终端设备，其特征在于，
    在所述远端终端不再使用所述中继终端接入网络的情况下，所述处理单元还用于删除其保持的所述远端终端的上下文信息。
  70. 根据权利要求56至69中任一项所述的终端设备，其特征在于，所述远端终端与所述中继终端之间的连接为PC5连接。
  71. 一种终端设备，其特征在于，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，执行如权利要求1至20中任一项所述的方法。
  72. 一种终端设备，其特征在于，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，执行如权利要求21至35中任一项所述的方法。
  73. 一种芯片，其特征在于，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求1至20中任一项所述的方法。
  74. 一种芯片，其特征在于，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求21至35中任一项所述的方法。
  75. 一种计算机可读存储介质，其特征在于，用于存储计算机程序，所述计算机程序使得计算机执行如权利要求1至20中任一项所述的方法。
  76. 一种计算机可读存储介质，其特征在于，用于存储计算机程序，所述计算机程序使得计算机执行如权利要求21至35中任一项所述的方法。
  77. 一种计算机程序产品，其特征在于，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求1至20中任一项所述的方法。
  78. 一种计算机程序产品，其特征在于，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求21至35中任一项所述的方法。
  79. 一种计算机程序，其特征在于，所述计算机程序使得计算机执行如权利要求1至20中任一项所述的方法。
  80. 一种计算机程序，其特征在于，所述计算机程序使得计算机执行如权利要求21至35中任一项所述的方法。
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