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WO2024027636A1 - 一种通信方法、通信装置及通信系统 - Google Patents

一种通信方法、通信装置及通信系统 Download PDF

Info

Publication number
WO2024027636A1
WO2024027636A1 PCT/CN2023/110194 CN2023110194W WO2024027636A1 WO 2024027636 A1 WO2024027636 A1 WO 2024027636A1 CN 2023110194 W CN2023110194 W CN 2023110194W WO 2024027636 A1 WO2024027636 A1 WO 2024027636A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
relay
remote
access network
information
Prior art date
Application number
PCT/CN2023/110194
Other languages
English (en)
French (fr)
Inventor
潘晓丹
彭文杰
姚楚婷
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2024027636A1 publication Critical patent/WO2024027636A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present application relates to the field of wireless communication technology, and in particular, to a communication method, communication device and communication system.
  • relay technology is needed, that is, one terminal device can assist another terminal device to communicate with the access network device.
  • the remote terminal device cooperates with the access network device through the cooperation of the relay terminal device. communicate.
  • the remote terminal device can communicate with the access network device directly or communicate with the access network device through the cooperation of the relay terminal device.
  • This application provides a communication method, communication device and communication system to ensure that multiple paths between the terminal device and the access network device are successfully configured for the terminal device.
  • embodiments of the present application provide a communication method, which can be executed by a remote terminal device or a module (such as a chip) applied in the remote terminal device.
  • the method includes: the remote terminal device receives a configuration message from the access network device through an interface between the remote terminal device and the access network device, and the configuration message includes The information of the relay terminal device, the configuration message is used for RRC reconfiguration; the remote terminal device sends instruction information to the relay terminal device based on the information of the relay terminal device, and the instruction information triggers the relay terminal device to enter RRC connection state.
  • the remote terminal device When configuring the relay terminal device for the remote terminal device, the remote terminal device passes the interface between the remote terminal device and the access network device. Receive information from the relay terminal device, and then the remote terminal device sends indication information to the relay terminal device. The indication information can trigger the relay terminal device to enter the RRC connection state, so that the relay terminal device can provide the remote terminal device with The relay service ensures that multiple paths between the remote terminal device and the access network device can be successfully configured for the remote terminal device, thereby improving the reliability of the communication between the remote terminal device and the access network device and improving the Service quality and user experience.
  • the remote terminal device determines that it is necessary to trigger the relay terminal device to enter the RRC connection state according to the RRC state of the relay terminal device.
  • the remote terminal device determines whether it needs to trigger the relay terminal device to enter the RRC connection state based on the RRC status of the relay terminal device. If there is no need to trigger the relay terminal device to enter the RRC connected state, the remote terminal device does not need to send indication information for triggering the relay terminal device to enter the RRC connected state, thereby saving signaling overhead. If it is necessary to trigger the relay terminal device to enter the RRC connection state, then send this indication information to ensure that the relay terminal device can be triggered to enter the RRC connection state, thereby ensuring that the remote terminal device and the access network can be successfully configured for the remote terminal device. Multiple paths between devices can improve the reliability of communication between remote terminal devices and access network devices, improving service quality and user experience.
  • the configuration message further includes status information indicating the RRC status of the relay terminal device; the remote terminal device determines the RRC status of the relay terminal device based on the status information.
  • the remote terminal device can accurately learn the RRC status of the relay terminal device based on the status information.
  • the base station carries status information in the configuration message and does not need to carry status information through additional messages, which can save signaling overhead.
  • the status information is carried in a message different from the above configuration message and sent to the remote terminal device.
  • This application does not limit the specific way in which the access network device sends status information to the remote terminal device.
  • the indication information is a configuration completion message in response to the configuration message.
  • the configuration completion message is used to trigger the relay terminal device to enter the RRC connection state. There is no need to send additional messages to trigger the relay terminal device to enter the RRC connection state, which can save signaling overhead.
  • the remote terminal device sends the configuration completion message to the access network device through an interface between the remote terminal device and the access network device.
  • the interface between the remote terminal device and the access network device may be a Uu air interface.
  • the remote terminal device sends indication information to the relay terminal device, including: the remote terminal device sends a request message to the relay terminal device, the request message includes the indication information, and the request The message is used to request the establishment of a unicast connection, and the indication information indicates that the purpose of establishing the unicast connection is to obtain the relay service of the relay terminal device.
  • the request message may be a unicast connection establishment request message or a unicast connection establishment reply message.
  • the indication information is a request message used to request the establishment of a unicast connection related to the relay service.
  • the indication information is PC5-S signaling, PC5 RRC message or side link media access control unit SL MAC CE signaling.
  • the remote terminal device determines that a link failure or connection failure occurs between the remote terminal device and the relay terminal device, and sends first failure indication information to the access network device, and the third failure indication information is sent to the access network device.
  • a failure indication information indicates that a link failure or connection failure occurs between the remote terminal device and the relay terminal device.
  • the access network device can reselect a relay terminal device for the remote terminal, and configure a link between the access network device, the new relay terminal device, and the remote terminal device.
  • the remote terminal device determines that a link failure or connection failure occurs between the remote terminal device and the access network device, and sends the second message to the access network device through the relay terminal device. Failure indication information, the second failure indication information indicates that a link failure or connection failure occurs between the remote terminal device and the access network device.
  • the access network device will be notified so that the access network device can perform subsequent processing. For example, the appropriate cell can be selected for the remote terminal device and the remote terminal device and access network device can be configured. links between.
  • the remote terminal device receives third failure indication information from the relay terminal device, and the third failure indication information indicates that a link occurs between the relay terminal device and the access network device. Failure or connection failure; the remote terminal device sends fourth failure indication information to the access network device, and the fourth failure indication information indicates that a link failure or connection failure occurs between the relay terminal device and the access network device. .
  • the remote terminal device sends information about at least one candidate terminal device to the access network device through an interface between the remote terminal device and the access network device.
  • the at least one candidate terminal device Including the relay terminal device, the information of the at least one candidate terminal device includes signal quality of the candidate terminal device and/or information indicating whether the candidate terminal device supports multi-path relay.
  • the information used to indicate whether the candidate terminal device supports multi-path relay may be an indication information or capability information of the candidate terminal device.
  • the capability information indicates that the candidate terminal device supports multi-path relay or does not. Supports multipath relay.
  • the remote terminal device provides one or more candidate terminal devices to the access network device, and then the access network device selects one terminal device from among them as the relay terminal device of the remote terminal device, which helps to implement the remote terminal device.
  • the terminal equipment is configured with appropriate relay terminal equipment.
  • the remote terminal device receives a discovery message from the candidate terminal device, and the discovery message includes information indicating whether the candidate terminal device supports multi-path relay.
  • the remote terminal device receives a discovery message from the candidate terminal device, and the identification information of the candidate terminal device corresponding to the discovery message is used to indicate whether the candidate terminal device supports multi-path relay.
  • embodiments of the present application provide a communication method, which can be executed by a relay terminal device or a module (such as a chip) applied in the relay terminal device.
  • the method includes: the relay terminal device receives instruction information from the remote terminal device, and the instruction information triggers the relay terminal device to enter the RRC connection state; The network access device sends side link user information, where the side link user information includes information about the remote terminal device and/or information about the relay terminal device.
  • the relay terminal device receives instruction information from the remote terminal device, and the instruction information can trigger the relay terminal device to enter the RRC connection state, so that the relay terminal device can provide relay services for the remote terminal device to ensure success.
  • the remote terminal device is configured with multiple paths between the remote terminal device and the access network device, thereby improving the reliability of communication between the remote terminal device and the access network device, and improving service quality and user experience.
  • the relay terminal device enters the RRC connection state according to the indication information.
  • the indication information is PC5-S signaling, PC5 RRC message, SL MAC CE signaling or a configuration completion message from the relay terminal device.
  • the relay terminal device receives the instruction information from the remote terminal device, including: the relay terminal device receives a request message from the remote terminal device, the request message includes the instruction information, the The request message is used to request the establishment of a unicast connection, and the indication information indicates that the purpose of establishing the unicast connection is to obtain the relay service of the relay terminal device.
  • the indication information is a request message used to request the establishment of a unicast connection related to the relay service.
  • the relay terminal device receives notification information from the access network device, and the notification information is used to determine whether the relay terminal device needs to forward control plane signaling for the remote terminal device; the relay Based on the notification information, the terminal device determines that it needs to forward the control plane signaling for the remote terminal device, or determines that it does not need to forward the control plane signaling for the remote terminal device.
  • the relay terminal device when the remote terminal device can receive the control plane signaling of the access network device through the interface between the remote terminal device and the access network device, the relay terminal device does not need to monitor and send signals to the relay terminal device. Forwarding the control plane signaling sent by the access network device can reduce the signaling overhead of the relay terminal device.
  • the relay terminal device determines that a link failure or connection failure occurs between the relay terminal device and the access network device, and sends failure indication information to the remote terminal device.
  • the failure indication information Indicates that a link failure or connection failure occurs between the relay terminal device and the access network device.
  • the relay terminal device sends a discovery message to the remote terminal device, and the discovery message includes information indicating that the relay terminal device supports multi-path relay.
  • the relay terminal device sends a discovery message to the remote terminal device, and the identification information of the relay terminal device corresponding to the discovery message is used to indicate that the relay terminal device supports multi-path relay.
  • embodiments of the present application provide a communication method, which can be executed by an access network device or a module (such as a chip) applied in the access network device.
  • the method includes: the access network device sends a configuration message to the remote terminal device through the interface between the remote terminal device and the access network device, and the configuration message includes the relay terminal.
  • This configuration message is used for RRC reconfiguration.
  • the status information indicates the RRC status of the relay terminal device; the access network device receives through the interface between the remote terminal device and the access network device.
  • the access network device when the access network device configures the relay terminal device for the remote terminal device, the access network device sends status information indicating the RRC status of the relay terminal device to the remote terminal device, so that the remote terminal device can learn The RRC status of the relay terminal device, and then the remote terminal device can determine whether it needs to trigger the relay terminal device to enter the RRC connection state, so that the relay terminal device can provide relay services for the remote terminal device to ensure the successful delivery of remote terminal equipment.
  • the terminal terminal device configures multiple paths between the remote terminal device and the access network device, thereby improving the reliability of communication between the remote terminal device and the access network device, and improving service quality and user experience.
  • the access network device receives a configuration completion message from the remote terminal device in response to the configuration message through an interface between the remote terminal device and the access network device.
  • the access network device receives a configuration completion message from the remote terminal device in response to the configuration message through the relay terminal device. In a possible implementation method, the access network device sends notification information to the relay terminal device, and the notification information is used to determine whether the relay terminal device needs to forward control plane signaling for the remote terminal device.
  • the relay terminal device when the remote terminal device can receive the control plane signaling from the access network device through the interface between the remote terminal device and the access network device, the relay terminal device does not need to monitor and send signals to the relay terminal. The device forwards the control plane signaling sent by the access network device, which can reduce the signaling overhead of the relay terminal device.
  • the access network device receives information from at least one candidate terminal device of the remote terminal device through an interface between the remote terminal device and the access network device.
  • the at least one candidate terminal device The device information includes signal quality of the candidate terminal device and/or information indicating whether the candidate terminal device supports multi-path relay; the access network device determines whether the candidate terminal device supports multi-path relay; Select the information of the terminal device, and select the relay terminal device from the at least one candidate terminal device.
  • the remote terminal device provides one or more candidate terminal devices to the access network device, and then the access network device selects one terminal device from among them as the relay terminal device of the remote terminal device, which helps to implement the remote terminal device.
  • the terminal equipment is configured with appropriate relay terminal equipment.
  • embodiments of the present application provide a communication method, which can be executed by a remote terminal device or a module (such as a chip) applied in the remote terminal device.
  • the method includes: the remote terminal device selects the relay terminal device; the remote terminal device sends an RRC re-establishment request message to the access network device; the remote terminal device receives the RRC re-establishment message of the access network device; the remote terminal device sends an RRC re-establishment completion message to the access network device, and the RRC re-establishment completion message includes the information of the relay terminal device and/or the remote terminal device Information.
  • the information of the relay terminal device may include the target layer 2 identification (L2 ID) of the relay terminal device.
  • the information of the remote terminal device may include the source layer 2 identification (L2 ID) of the remote terminal device.
  • the access network device can configure multipath for the remote terminal device based on the information of the relay terminal device selected by the remote terminal device, which helps to realize the remote terminal device. Quick configuration of multipathing devices.
  • the remote terminal device before the remote terminal device sends the RRC re-establishment completion message to the access network device, the remote terminal device establishes a unicast connection with the relay terminal device and triggers the relay.
  • the terminal device reports the identification information of the relay terminal device and/or the identification information of the remote terminal device.
  • the access network device is based on the information of the relay terminal device and/or the information of the remote terminal device in the RRC re-establishment completion message, and the identification information of the relay terminal device and/or the remote terminal device received from the relay terminal device.
  • the identification information of the terminal terminal device is used to configure a multipath relay for the remote terminal device, so that the remote terminal device can establish a multipath relay through the relay terminal device and the access network device.
  • the remote terminal device selects the relay terminal device, which specifically includes: the remote terminal device selects a terminal device as the relay terminal device from the cell where the remote terminal device is located.
  • the relay terminal device may be a terminal device with the largest reference signal reception power in the cell, or any terminal device in the cell.
  • the relay terminal device selected by the remote terminal device and the remote terminal device may not be in the same cell, but the cell where the remote terminal device is located and the cell where the relay terminal device is located belong to the same access network device.
  • embodiments of the present application provide a communication method, which can be executed by a remote terminal device or a module (such as a chip) applied in the remote terminal device.
  • the method includes: the remote terminal device determines that a link failure or connection failure occurs between the remote terminal device and the relay terminal device, and sends a first failure indication message to the access network device.
  • the first failure indication information indicates that a link failure or connection failure occurs between the remote terminal device and the relay terminal device.
  • the access network device if a connection is established between the remote terminal device and the relay terminal device, but a subsequent link failure or connection failure occurs between the remote terminal device and the relay terminal device, the access network device is notified , the access network equipment can quickly re-establish the link between the remote terminal equipment and the relay terminal equipment, or the access network equipment can re-select a relay terminal equipment and establish the corresponding multi-path relay, which helps to achieve remote control.
  • Terminal equipment provides high-quality service guarantee.
  • the remote terminal device determines that a link failure or connection failure occurs between the remote terminal device and the access network device, and sends the second message to the access network device through the relay terminal device. Failure indication information, the second failure indication information indicates that a link failure or connection failure occurs between the remote terminal device and the access network device.
  • the access network equipment can quickly re-establish the link between the remote terminal equipment and the access network equipment, which helps to provide high-quality service guarantee for the remote terminal equipment.
  • the remote terminal device receives third failure indication information from the relay terminal device, and the third failure indication information indicates that a link occurs between the relay terminal device and the access network device. Failure or connection failure; the remote terminal device sends fourth failure indication information to the access network device, and the fourth failure indication information indicates that a link failure or connection failure occurs between the relay terminal device and the access network device. .
  • the access network device if a connection is established between the relay terminal device and the access network device, but a subsequent link failure or connection failure occurs between the relay terminal device and the access network device, the access network device is notified and the access network device is connected.
  • the network access device can quickly re-establish the link between the relay terminal device and the access network device, or the access network device reselects a relay terminal device and establishes the corresponding multi-path relay, which helps realize the remote terminal
  • the equipment provides high-quality service guarantee.
  • embodiments of the present application provide a communication method, which can be executed by a relay terminal device or a module (such as a chip) applied in the relay terminal device.
  • the method includes: the relay terminal device determines that a link failure or connection failure occurs between the relay terminal device and the access network device, and sends failure indication information to the remote terminal device, The failure instruction letter The message indicates that a link failure or connection failure occurs between the relay terminal device and the access network device.
  • embodiments of the present application provide a communication method, which can be executed by an access network device or a module (such as a chip) applied in the access network device.
  • the method includes: the access network device determines whether the relay terminal device needs to forward control plane signaling for the remote terminal device; the access network device sends notification information to the relay terminal device , the notification information is used to determine whether the relay terminal device needs to forward control plane signaling to the remote terminal device.
  • the relay terminal device when the remote terminal device can receive the control plane signaling of the access network device through the interface between the remote terminal device and the access network device, the relay terminal device does not need to monitor and send signals to the relay terminal device. Forwarding the control plane signaling sent by the access network device can reduce the signaling overhead of the relay terminal device.
  • the access network device determines whether the relay terminal device needs to forward control plane signaling to the remote terminal device, including: when the remote terminal device can communicate with the interface through the remote terminal device.
  • the interface between the access network devices receives the control plane signaling from the access network device, then the access network device determines that the relay terminal device does not need to forward the control plane signaling to the remote terminal device; when the remote terminal If the terminal device cannot receive control plane signaling from the access network device through the interface between the remote terminal device and the access network device, the access network device determines that the relay terminal device needs to be the remote terminal device.
  • the terminal device forwards control plane signaling.
  • the access network device sends a configuration message to the remote terminal device through the interface between the remote terminal device and the access network device.
  • the configuration message includes the information and status information of the relay terminal device,
  • the configuration message is used for RRC reconfiguration.
  • the status information indicates the RRC status of the relay terminal device;
  • the access network device receives the RRC status from the remote terminal device through the interface between the remote terminal device and the access network device.
  • the access network device receives the side link user information from the relay terminal device, the side link user information includes the information of the relay terminal device and the remote terminal device Information.
  • embodiments of the present application provide a communication method, which can be executed by a relay terminal device or a module (such as a chip) applied in the relay terminal device.
  • the method includes: the relay terminal device receives notification information from the access network device, and the notification information is used to determine whether the relay terminal device needs to forward the control plane for the remote terminal device. Signaling; based on the notification information, the relay terminal device determines that it needs to forward control plane signaling to the remote terminal device, or determines that it does not need to forward control plane signaling to the relay terminal device.
  • the relay terminal device when the remote terminal device can receive the control plane signaling of the access network device through the interface between the remote terminal device and the access network device, the relay terminal device does not need to monitor and send signals to the relay terminal device. Forwarding the control plane signaling sent by the access network device can reduce the signaling overhead of the relay terminal device.
  • the notification information indicates the type of relay service provided by the relay terminal device; the relay terminal device determines that it needs to forward control plane signaling to the remote terminal device according to the notification information, or determines that There is no need to forward control plane signaling to the relay terminal device, including: the relay terminal device determines that it needs to forward control plane signaling to the remote terminal device according to the relay service type provided by the relay terminal device, or determines that There is no need to forward control plane signaling for this relay terminal device.
  • the relay terminal device receives indication information from the remote terminal device, and the indication information triggers the relay terminal device to enter the RRC connection state; the relay terminal device sends an edge link to the access network device User information, the side link user information includes information of the remote terminal device and/or information of the relay terminal device.
  • inventions of the present application provide a communication device.
  • the device may be a remote terminal device, or may be a chip or module for the remote terminal device.
  • the device has the function of realizing any implementation method of the above-mentioned first aspect, fourth aspect or fifth aspect. This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, which may be a relay terminal device or a chip used for the relay terminal device.
  • the device has the function of realizing any implementation method of the above-mentioned second aspect, sixth aspect or eighth aspect.
  • This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, which may be an access network device or a chip used for the access network device.
  • the device has the function of realizing any implementation method of the above third aspect or seventh aspect. This function can be implemented by hardware, or it can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • embodiments of the present application provide a communication device, including a processor and an interface circuit.
  • the processor is configured to communicate with other devices through the interface circuit and perform any implementation method in the above-mentioned first to sixth aspects.
  • the processor includes one or more.
  • embodiments of the present application provide a communication device, including a processor coupled to a memory.
  • the processor is configured to call a program stored in the memory to execute any implementation of the above-mentioned first to sixth aspects. method.
  • the memory may be located on the device within or outside the device.
  • the processor can be one or more.
  • embodiments of the present application provide a communication device, including a processor and a memory; the memory is used to store computer instructions, and when the device is running, the processor executes the computer instructions stored in the memory, so that the device Execute any implementation method in the above first to sixth aspects.
  • embodiments of the present application provide a communication device, including units or means for executing each step of any implementation method in the above-mentioned first to sixth aspects.
  • embodiments of the present application further provide a computer-readable storage medium in which instructions are stored, and when run on a communication device, the instructions in the first to sixth aspects are implemented. Any implementation method of is executed.
  • embodiments of the present application further provide a computer program product.
  • the computer program product includes a computer program or instructions.
  • the computer program or instructions are run by a communication device, any one of the above-mentioned first to sixth aspects is enabled.
  • the implementation method is executed.
  • embodiments of the present application further provide a chip system, including: a processor configured to execute any of the implementation methods of the first to sixth aspects.
  • embodiments of the present application further provide a communication system, including a remote terminal device for performing any implementation method of the first aspect, and a relay terminal device for performing any implementation method of the second aspect.
  • the communication system further includes access network equipment for performing any implementation method of the third aspect.
  • embodiments of the present application further provide a communication system, including an access network device for performing any implementation method of the seventh aspect, and a relay terminal device for performing any implementation method of the eighth aspect.
  • Figure 1 is a schematic diagram of the architecture of a communication system applied in an embodiment of the present application
  • Figure 2 is a schematic diagram of the communication architecture of SL U2NRelay
  • Figure 3 is a schematic diagram of the protocol stack of L2SL U2N Relay
  • Figure 4 is a schematic diagram of the multi-path Relay communication architecture
  • Figure 5 is a schematic diagram of the protocol stack architecture of multi-path Relay
  • Figure 6(a) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 6(b) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 6(c) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 6(d) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 6(e) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 6(f) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 7 is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 8(a) is a schematic diagram of PC5 RLF occurring between the remote UE and the relay UE;
  • Figure 8(b) is a schematic diagram of a link failure between the remote UE and the relay UE;
  • Figure 8(c) is a schematic diagram of Uu RLF occurring between the relay UE and the base station;
  • Figure 8(d) is a schematic diagram of RRC establishment failure between the relay UE and the base station
  • Figure 8(e) is a schematic diagram of RRC establishment failure between the relay UE and the base station
  • Figure 9 is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • Figure 10 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • Figure 11 is a schematic diagram of a communication device provided by an embodiment of the present application.
  • Figure 12 provides a schematic structural diagram of a terminal device.
  • FIG 1 is a schematic architectural diagram of a communication system applied in an embodiment of the present application.
  • the communication system 1000 includes a wireless access network 100 and a core network 200.
  • the communication system 1000 may also include the Internet 300.
  • the wireless access network 100 includes at least one access network device, such as 110a and 110b in Figure 1, and at least one terminal device, such as 120a-120j in Figure 1.
  • 110a is a base station
  • 110b is a micro station
  • 120a, 120e, 120f and 120j are mobile phones
  • 120b is a car
  • 120c is a gas pump
  • 120d is a home access point (HAP) arranged indoors or outdoors.
  • 120g is a laptop
  • 120h is a printer
  • 120i is a drone.
  • the same terminal device or access network device can provide different functions in different application scenarios.
  • the mobile phone in Figure 1 has 120a, 120e, 120f and 120j
  • the mobile phone 120a can access the base station 110a, connect to the car 120b, directly communicate with the mobile phone 120e and access the HAP
  • the mobile phone 120b can access the HAP and directly communicate with the mobile phone 120a
  • the mobile phone 120f can access as
  • the micro station 110b is connected to the laptop 120g, the printer 120h
  • the mobile phone 120j can control the drone 120i.
  • the terminal equipment is connected to the access network equipment, and the access network equipment is connected to the core network.
  • the core network equipment and the access network equipment can be independent and different physical devices, or the functions of the core network equipment and the logical functions of the access network equipment can be integrated on the same physical device, or they can be integrated on one physical device. It provides the functions of some core network equipment and some of the functions of access network equipment.
  • Terminal equipment and terminal equipment and access network equipment and access network equipment can be connected to each other in a wired or wireless manner.
  • Figure 1 is only a schematic diagram.
  • the communication system may also include other network equipment, such as wireless relay equipment and wireless backhaul equipment, which are not shown in Figure 1 .
  • the access network equipment can be a base station, an evolved base station (evolved NodeB, eNodeB), a transmission reception point (TRP), or a next-generation base station in the fifth generation (5th generation, 5G) mobile communication system.
  • eNodeB evolved base station
  • TRP transmission reception point
  • next-generation base station in the fifth generation (5th generation, 5G) mobile communication system.
  • gNB next generation NodeB
  • 6th generation, 6G mobile communication systems base stations in future mobile communication systems or access nodes in wireless fidelity (wireless fidelity, WiFi) systems, etc.
  • It can be a module or unit that completes some functions of the base station.
  • it can be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU).
  • the access network equipment may be a macro base station (110a in Figure 1), a micro base station or an indoor station (110b in Figure 1), or a relay node or a donor node.
  • the embodiments of this application do not limit the specific technology and specific equipment form used by the access network equipment.
  • a base station is used as an example of an access network device for description.
  • Terminal equipment can also be called terminal, user equipment (UE), mobile station, mobile terminal, etc.
  • Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), and the Internet of Things (internet of things, IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc.
  • Terminal devices can be mobile phones, tablets, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the specific technology and specific equipment form used by the terminal equipment.
  • Base stations and UEs can be fixed-location or mobile. Base stations and UEs can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of this application do not limit the application scenarios of base stations and UEs.
  • the helicopter or drone 120i in Figure 1 may be configured as a mobile base station.
  • 120i For those 120j that access the wireless access network 100 through 120i, 120i is a base station; But for base station 110a, 120i is a UE, that is, communication between 110a and 120i is through a wireless air interface protocol. Of course, communication between 110a and 120i can also be carried out through an interface protocol between base stations.
  • base stations and UEs can be collectively called communication devices, 110a and 110b in Figure 1 can be called communication devices with base station functions, and 120a-120j in Figure 1 can be called communication devices with UE functions.
  • Communication between the base station and the UE, between the base station and the base station, and between the UE and the UE can be carried out through licensed spectrum, communication can also be carried out through unlicensed spectrum, or communication can be carried out through licensed spectrum and unlicensed spectrum at the same time; it can communicate through 6,000 It can communicate using spectrum below gigahertz (GHz), it can also communicate through spectrum above 6GHz, and it can also communicate using spectrum below 6GHz and spectrum above 6GHz at the same time.
  • GHz gigahertz
  • the embodiments of the present application do not limit the spectrum resources used for wireless communication.
  • data communication between UEs can be carried out through the network, or communication between UEs can be carried out directly without using the network.
  • the interface between UE and UE is called PC5 interface, which is similar to the Uu interface between UE and base station.
  • the link between UEs is called sidelink.
  • a typical application scenario of sidelink communication is vehicle-to-everything (V2X).
  • V2X vehicle-to-everything
  • each car is a UE, and data can be transmitted directly between UEs through sidelink without going through the network, which can effectively reduce communication delays.
  • side links can also be called side links, side links, side links, etc.
  • Broadcast communication on the sidelink is similar to the base station broadcasting system information, that is, the UE sends broadcast service data to the outside without encryption. Any other UE within the effective reception range can receive the broadcast service data if it is interested in the broadcast service.
  • Unicast communication on the sidelink is similar to data communication after a radio resource control (RRC) connection is established between the UE and the base station, and a unicast connection needs to be established between the two UEs first. After establishing a unicast connection, both UEs can The negotiated identity is used for data communication, and the data may or may not be encrypted.
  • RRC radio resource control
  • Multicast communication on sidelink refers to communication between all UEs in a communication group. Any UE in the group can send and receive data of the multicast service.
  • a unicast communication on the sidelink corresponds to a pair of source layer-2 identifier (source L2 ID) and destination layer-2 identifier (destination layer-2 identifier, destination L2 ID).
  • the sub-header of each sidelink media access control protocol data unit (MAC PDU) generally contains the source L2 ID and destination L2 ID so that the data can be transmitted from the sender to the correct receiver. end.
  • Wireless bearer is the general term for a series of protocol entities and configurations allocated by the base station to the UE, including packet data convergence protocol (PDCP) entities, radio link control (RLC) protocol entities, and media access control (medium access control, MAC) protocol entity and a series of resources allocated by the physical layer (PHY), etc.
  • Radio bearers are divided into data radio bearers (DRB) and signaling radio bearers (SRB). The former is used to carry data, and the latter is used to carry signaling messages.
  • DRB data radio bearers
  • SRB signaling radio bearers
  • SLRB sidelink radio bearer
  • the wireless bearer configuration generally only includes the configuration of the PDCP layer and the service data adaptation protocol (SDAP) layer.
  • SDAP service data adaptation protocol
  • the protocol entities below the RLC layer are called RLC bearers, and the corresponding configurations are in the RLC bearer configuration. given in .
  • RLC bearer refers to the protocol entities and configurations below the RLC layer. It is the lower part of the wireless bearer and includes a series of resources such as RLC protocol entities and logical channels. An RLC bearer is associated with a logical channel. Generally, an RLC bearer is associated with a PDCP entity, that is, one RLC serves one radio bearer RB.
  • a UE that supports proximity services searches for nearby UEs through the discovery process and establishes a unicast connection with them for subsequent sidelink communications.
  • the discovery protocol layer of the UE generates a discovery message, submits it to the PDCP layer, and sends it to the opposite UE through the bottom layer.
  • Model A Model A
  • Model B Model B
  • UE can be divided into announcing UE (Announcing UE) and monitoring UE (Monitoring UE).
  • Announcing UE broadcasts a discovery message, which is also called an announcement message.
  • the announcement message can carry specific information of the Announcing UE, such as a relay service code indicating the type of service that can be provided. RSC), used by surrounding UEs to determine whether they need Announcing the service types that the UE can provide.
  • RSC relay service code indicating the type of service that can be provided.
  • the neighboring Monitoring UE monitors and receives the announcement message, it determines whether to use the Announcing UE as the opposite end UE for sidelink communication based on the content carried in the announcement message.
  • UE can be divided into Discoverer UE and Discoveree UE.
  • Discoverer UE broadcasts a discovery message, which is also called a solicitation message.
  • the request message carries information about the service type that discoverer UE is interested in.
  • the discoveree UE monitors and receives the request message, if it finds that it meets the discoverer UE's business requirements, it will reply to the discoverer UE with another discovery message.
  • This discovery message is also called a response message.
  • the discovery message carries the source L2 ID and destination L2 ID, which are used by the UE to send or receive discovery messages.
  • the source L2 ID is assigned by the sending UE itself, and the destination L2 ID is the predefined or preconfigured default destination L2 ID.
  • a unicast connection is established between UEs through the unicast connection establishment process.
  • the UE that initiates the unicast connection establishment process is called the initiating UE (initiating UE), and the opposite end UE of the initiating UE is called the target UE (target UE).
  • the initiating UE sends a unicast connection establishment request (direct communication request, DCR) message to the target UE, which carries the L2 ID of the initiating UE, the L2 ID of the target UE and user information.
  • the user information includes upper application layer related information. Information.
  • target UE After target UE receives the unicast connection establishment request message, it determines whether it can accept the unicast connection establishment request based on the user information in the unicast connection establishment request message. If the unicast connection establishment request can be accepted, a unicast connection acceptance (direct communication accept, DCA) message is returned to the initiating UE; otherwise, a unicast connection rejection (direct communication reject, DCR) message is returned to the initiating UE.
  • DCA direct communication accept
  • DCR direct communication reject
  • the monitoring UE finds a suitable peer UE, it can actively initiate the unicast connection establishment process.
  • the discoverer UE receives the reply message from the appropriate discoveree UE, it can initiate the unicast establishment process.
  • Sidelink UE-to-Network Relay also called sidelinkUE-to-Network Relay, SLUE-to-Network Relay or SL U2N Relay
  • SL U2N Relay is a technology that allows one UE to help another UE communicate with the base station. It is also called relay technology.
  • Figure 2 is a schematic diagram of the communication architecture of SL U2NRelay.
  • the remote UE (Remote UE) communicates with the base station through the cooperation of the relay UE (Relay UE).
  • Remote UE and Relay UE communicate through sidelink.
  • the corresponding interface is called PC5.
  • the Relay UE is directly connected to the base station, that is, Communicate through the Uu port.
  • L2 SL U2N Relay The embodiments of this application can be used in the Layer 2 (L2) scenario of SL U2N Relay, hereinafter referred to as L2 SL U2N Relay.
  • Figure 3 is a schematic diagram of the protocol stack of L2SL U2NRelay.
  • Remote UE's data packets are relayed and forwarded below the PDCP layer of Relay UE, that is, Relay UE only maintains the RLC bearer of the relay, including the RLC layer, MAC layer and PHY layer. Therefore, there are end-to-end PDCP layer, SDAP layer and RRC layer between Remote UE and the base station, but there are no end-to-end RLC layer, MAC layer and PHY layer.
  • This protocol architecture adds a sidelink relay adaptation protocol (SRAP) layer between the RLC layer and the PDCP layer.
  • SRAP sidelink relay adaptation protocol
  • the main function of the SRAP layer is the multiplexing and demultiplexing of wireless bearers, that is, it supports the multiplexing of different wireless bearers into one RLC bearer and the corresponding demultiplexing process.
  • the RLC bearer between Remote UE and Relay UE is called PC5 Relay RLC channel/bearer
  • the RLC bearer between Relay UE and base station is called Uu Relay RLC channel/bearer.
  • the base station will perform SRAP configuration for Remote UE and Relay UE.
  • the SRAP configuration can include the mapping relationship between the SRB ID/DRB ID of the Remote UE and the Uu Relay RLC channel/PC5 Relay RLC channel, so that the data of the Remote UE can pass through correctly.
  • Relay UE performs relay forwarding. Specifically, the base station will configure the mapping relationship between the radio bearer (SRB or DRB) and the PC5 Relay RLC channel for the Remote UE, and configure the mapping relationship between the Radio Bearer of the Remote UE and the Uu/PC5 Relay RLC channel for the Relay UE.
  • the Remote UE After the SRAP layer of the Remote UE receives the PDCP PDU from the PDCP layer, it will add the Remote UE ID information and the ID information of the radio bearer (SRB or DRB) in the SRAP header.
  • the Relay UE After the adaptation layer receives the data packet from the PC5 Relay RLC channel, it can submit it to the correct Uu Relay RLC channel according to the mapping relationship configured by the base station. After the base station side receives the data packet from the Uu Relay RLC channel, it will submit it to the correct Uu Relay RLC channel according to the mapping relationship in the SRAP header. Remote UE ID information and wireless bearer ID information are submitted to the corresponding PDCP layer for processing.
  • the Remote UE ID information can be the Local ID of the remote UE.
  • the Local ID is the UE identification assigned by the base station to the Remote UE.
  • the Local ID is used for uplink and downlink data transmission of the Remote UE. By adding this identification in the SRAR header, Relay can be enabled.
  • the UE and the base station identify the Remote UE to which the data packet belongs.
  • Multi-path relay also called multi-path Relay
  • the “path” in the embodiment of this application refers to a communication path or communication link.
  • FIG. 4 is a schematic diagram of the multi-path Relay communication architecture.
  • Remote UE communicates with the base station through a direct link and an indirect link at the same time.
  • Remote UE and Relay UE are located within the cell coverage of the same base station.
  • On the direct link Remote UE communicates with the base station directly through the Uu port.
  • On the indirect link Remote UE communicates with the base station through Relay UE.
  • Remote UE and Relay UE can be connected and communicated through sidelink, or they can communicate through non-3GPP links. Remote UE improves the throughput and reliability of data transmission and reception by simultaneously transmitting and receiving the same or different data on two links.
  • Figure 5 is a schematic diagram of the protocol stack architecture of multi-path Relay.
  • Figure 5 (a) is a schematic diagram of the protocol stack architecture based on L2 SL U2N Relay. Remote UE and Relay UE were previously connected through sidelink, so this architecture is based on the L2 SL U2N Relay protocol stack architecture, adding Remote UE and base station protocol stack for direct communication.
  • (b) of Figure 5 shows the protocol stack architecture when Remote UE and Relay UE are connected through non-3GPP. There is an adaptation layer between Remote UE and Relay UE, Relay UE and the base station, but for the SRAP layer, there can be SRAP layer, or there may be no SRAP layer, depending on the requirements of Remote UE bearer multiplexing.
  • Figure 6(a) is a schematic flowchart of a communication method provided by an embodiment of the present application. This method is used to configure multipath between the remote UE and the base station for the remote UE. Before configuring multipath, there is a direct path between the remote UE and the base station, that is, the remote UE can communicate with the base station through the Uu air interface between the remote UE and the base station, and then configure the relay for the remote UE on this basis. UE, the remote UE can communicate with the base station through the relay UE.
  • the method includes the following steps:
  • Step 601a The base station sends an RRC reconfiguration message to the remote UE through the interface between the remote UE and the base station.
  • the remote UE receives the RRC reconfiguration message through the interface.
  • the RRC reconfiguration message may also be called an RRC configuration message, an RRC message, a reconfiguration message or a configuration message.
  • the embodiment of the present application does not limit the name of the message, and a unified description is provided here. .
  • the RRC reconfiguration message includes information about the relay UE.
  • the information of the relay UE may be the source L2 ID of the relay UE, The source address of the relay UE, etc.
  • the RRC reconfiguration message may also include SRAP configuration information, end-to-end bearer configuration information between the remote UE and the base station, or PC5 relay RLC channel/bearer between the remote UE and the relay UE. At least one of the configuration information.
  • the SRAP configuration information includes the mapping relationship between the SRB ID/DRB ID of the remote UE and the PC5 relay RLC channel/bearer.
  • Step 602a The remote UE sends indication information to the relay UE according to the information of the relay UE.
  • the indication information triggers the relay UE to enter the RRC connected state.
  • the remote UE does not perceive the RRC status of the relay UE.
  • the remote UE sends the indication information to the relay UE.
  • the relay UE ignores the indication information. If the relay UE is in the RRC idle state (RRC_IDLE) or RRC deactivation state (RRC INACTIVE), then the relay UE The relay UE enters the RRC connected state from the RRC idle state or the RRC deactivated state. Perception in the embodiments of this application can be understood as determination, judgment or inspection. This is described in a unified manner and will not be described in detail later.
  • the remote UE senses the RRC status of the relay UE.
  • the RRC reconfiguration message in step 601a includes status information indicating the RRC status of the relay UE. If the remote UE determines that the RRC state of the relay UE is the RRC connected state, the relay UE does not send the above indication information to the relay UE. If the RRC state of the relay UE is the RRC idle state or the RRC deactivated state, the remote UE If the UE determines that it needs to trigger the relay UE to enter the RRC connected state, the remote UE sends the above indication information to the relay UE. Therefore, if the relay UE receives the indication information, the relay UE enters the RRC connected state from the RRC idle state or the RRC deactivation state according to the indication information.
  • the remote UE senses the RRC status of the relay UE, but no matter what the RRC status of the relay UE is, after receiving the RRC reconfiguration message, the remote UE will send the indication information to the relay UE. That is to say, the RRC reconfiguration message triggers the remote UE to send the indication information to the relay UE.
  • the specific RRC status of the relay UE does not affect the remote UE to send the indication information.
  • Step 603a The relay UE in the RRC connected state sends sidelink user information (SUI) to the base station. Accordingly, the base station receives the SUI.
  • SAI sidelink user information
  • the SUI includes information about the remote UE and/or information about the relay UE.
  • the information of the relay UE may be the source L2 ID or source address of the relay UE, etc.
  • the information of the remote UE may be the destination L2 ID or target address of the remote UE, etc.
  • step 603a is executed. If the relay UE is already in the RRC connected state before receiving the indication information, the relay UE may have reported the relay UE information to the base station before, so step 603a can be executed or skipped (i.e. not executed). This step 603a).
  • Step 604a After receiving the SUI from the relay UE, the base station sends an RRC reconfiguration message to the relay UE. Correspondingly, the relay UE receives the RRC reconfiguration message.
  • the RRC reconfiguration message includes SRAP configuration information, Uu relay RLC channel/bearer configuration information between the relay UE and the base station, or PC5 relay RLC channel/bearer configuration information between the remote UE and the relay UE. at least one.
  • the SRAP configuration information includes the mapping relationship between the SRB ID/DRB ID of the remote UE and the PC5 relay RLC channel/bearer, and the mapping relationship between the SRB ID/DRB ID of the remote UE and the Uu relay RLC channel/bearer. mapping relationship.
  • the relay UE can be configured for the remote UE, and when the relay UE is in the RRC idle state or the RRC deactivated state, the relay UE is activated, so that the relay UE enters the RRC connected state, thereby ensuring Multiple paths between the remote UE and the base station are successfully configured for the remote UE, thereby improving the reliability of communication between the remote UE and the base station, and improving service quality and user experience.
  • the base station can send notification information to the relay UE.
  • the notification information Used by the relay UE to determine whether it needs to forward control plane signaling for the remote UE. Based on the notification information, the relay UE determines that it needs to forward the control plane signaling of the base station for the remote UE, or determines that it does not need to forward the base station's control plane signaling for the remote UE.
  • Control plane signaling issued.
  • the control plane signaling may be a system message or a paging message.
  • the remote UE may be configured with multipath in the manner shown in Figure 6(a), or may be configured with multipath in other manners.
  • the embodiments of this application do not limit this, that is to say The process of the base station sending notification information to the relay UE may be independent of the process shown in Figure 6(a), or may be coupled with the process shown in Figure 6(a).
  • the notification information can be carried in the RRC reconfiguration message of the above step 604a, or through Other separate messages (such as RRC messages command or MAC CE signaling, etc.) to send the notification information.
  • the notification information may indicate that the relay service type provided by the relay UE is 3GPP R17 relay service or 3GPP R18 relay service.
  • the relay UE is used to provide SL U2N Relay for the remote UE.
  • the relay UE is used to provide multi-path Relay for remote UEs, that is, to provide multi-path relay services.
  • the notification information indicates that the relay UE needs to forward the control plane signaling of the base station for the remote UE or does not need to forward the control plane signaling of the base station for the remote UE.
  • the relay UE can determine that the remote UE can only use indirect The link communicates with the base station, or the remote UE and the base station cannot directly send and receive control plane signaling. Therefore, the remote UE cannot directly receive the control plane signaling from the base station, so the relay UE will forward it to the remote UE.
  • Control plane signaling For example, the relay UE forwards the system message to the remote UE. Or the relay UE calculates the paging time slot of the remote UE and monitors the paging message of the remote UE on the paging time slot of the remote UE.
  • the relay UE monitors the paging message that the base station needs to send to the remote UE, , then the relay UE sends the paging message to the remote UE according to the identification information of the remote UE in the paging message. This method can improve the communication reliability of the remote UE.
  • the relay UE determines that the remote UE has It can communicate with the base station through an indirect link or through a direct link, so the remote UE can receive control plane signaling directly from the base station. Therefore, the relay UE does not need to forward the control plane signaling sent by the base station to the remote UE for the remote UE, but the remote UE itself directly receives the control plane signaling from the base station. This method can reduce the signaling overhead of relay UE.
  • the base station may send notification information to the relay UE when the relay UE does not need to provide relay forwarding of control plane signaling. Therefore, if the relay UE does not receive the notification information sent by the base station, the default relay UE needs to provide control plane relay forwarding services for the remote UE.
  • the base station may send notification information to the relay UE when the relay UE is required to provide relay forwarding of control plane signaling. Therefore, if the relay UE does not receive the notification information sent by the base station, the default relay UE does not need to provide the control plane relay forwarding service for the remote UE.
  • the indication information is an RRC reconfiguration complete message, or the indication information is carried through the RRC reconfiguration complete message.
  • the RRC reconfiguration complete message is used to respond to the RRC reconfiguration message and is used to indicate that the RRC reconfiguration has been completed.
  • the RRC reconfiguration completion message may also be called the RRC configuration completion message, RRC completion message, reconfiguration completion message, configuration completion message, completion message or response message, etc.
  • the embodiment of this application does not limit the name of the message, which is unified here. illustrate.
  • Figure 6(b) is a schematic flowchart of a communication method provided by an embodiment of the present application. This method is expanded on the basis of the embodiment of Figure 6(a), and the embodiment of Figure 6(b) is a specific implementation solution of the embodiment of Figure 6(a).
  • the indication information in Figure 6(a) is specifically the RRC reconfiguration complete message in Figure 6(b).
  • the remote UE may determine the method of sending the RRC reconfiguration complete message according to the RRC status of the relay UE.
  • the method of sending the RRC reconfiguration complete message may be: the remote UE sends the RRC reconfiguration complete message to the base station through the interface between the remote UE and the base station, or the remote UE sends the RRC reconfiguration message to the base station through the relay UE.
  • completion message that is, the remote UE sends an RRC reconfiguration complete message to the relay UE, and then the relay UE forwards the RRC reconfiguration complete message to the base station.
  • the remote UE determines that it needs to trigger the relay UE to enter the RRC connected state, and triggers the relay UE to enter the RRC reconfiguration complete message.
  • RRC connected state that is, the remote UE sends an RRC reconfiguration complete message to the relay UE, and the relay UE forwards the RRC reconfiguration complete message to the base station.
  • the RRC reconfiguration complete message can trigger the relay UE to enter the RRC connected state.
  • the remote UE can reply to the RRC reconfiguration completion message through the direct link between the remote UE and the base station, or the remote UE can also reset the RRC configuration.
  • the configuration complete message is sent to the relay UE, and then the relay UE sends the RRC reconfiguration complete message to the base station.
  • the remote UE does not perceive the RRC status of the relay UE and directly sends an RRC reconfiguration complete message to the relay UE.
  • the relay UE receives the RRC reconfiguration complete message, if the relay UE is currently in the RRC idle state or the RRC inactive state, the relay UE needs to enter the RRC connected state. Then the relay UE forwards the RRC reconfiguration complete message to the base station (ie step b).
  • the order of step b and step 603a is not limited.
  • the remote UE before step 602a, if no unicast connection is established between the remote UE and the relay UE, the remote UE first establishes a unicast connection with the relay UE (ie step a), for example, the remote UE The relay UE sends a unicast connection establishment request message to request the establishment of a unicast connection.
  • Method 2 The indication information is carried in the request message.
  • the request message is used to request the establishment of a unicast connection.
  • the indication information indicates that the purpose of establishing the unicast connection is to obtain the relay service of the relay UE.
  • the request message may be a unicast connection establishment request message or a unicast connection establishment reply message.
  • Figure 6(c) is a schematic flowchart of a communication method provided by an embodiment of the present application. This method is expanded on the basis of the embodiment of Figure 6(a), and the embodiment of Figure 6(c) is a specific implementation solution of the embodiment of Figure 6(a).
  • the indication information in Figure 6(a) is sent to the relay UE through the unicast connection establishment process in Figure 6(c), that is, the indication information is carried in the request message for requesting to establish a unicast connection, and the indication information indicates The unicast connection is established to obtain the relay service of the relay UE.
  • the remote UE sends the above request message to the relay UE, where the request message carries indication information (ie, step 602a) .
  • the remote UE determines that it needs to trigger the relay UE to enter the RRC connected state, and then carries the request message in the above request message. Indication information, used to trigger the relay UE to enter the RRC connected state.
  • the relay UE After receiving the request message, the relay UE establishes a unicast connection with the remote UE on the one hand, and on the other hand, the relay UE enters the RRC connection state according to the indication information.
  • the relay UE does not perceive the RRC status of the relay UE, and directly carries the indication information in the above request message. After the relay UE receives the request message, on the one hand, it establishes a unicast connection with the remote UE. On the other hand, if the relay UE is currently in the RRC idle state or RRC deactivation state, the relay UE also needs to enter RRC connection state.
  • the indication information in the above request message may be an explicit indication information, such as binary indication information or enumeration type indication information.
  • the indication information explicitly indicates that the purpose of establishing a unicast connection is to obtain the Relay service following UE.
  • the indication information may also be an implicit indication information.
  • the indication information is a relay service code or the user information of the relay UE.
  • the relay service code or the user information of the relay UE implicitly indicates the establishment of the unit.
  • the broadcast connection is to obtain the relay service of the relay UE.
  • the relay UE is triggered to enter the RRC connected state through the indication information carried in the request message.
  • the relay UE can also be triggered to enter the RRC connection state through the indication information corresponding to the request message, that is, the indication information is not carried in the request message.
  • the indication information is the indication information corresponding to the request message.
  • Special L2 ID The service type corresponding to this special L2 ID is the relay service type.
  • This special L2 ID is the special L2 ID of the relay UE or the special L2 ID of the remote UE used to establish multi-path relay. If the special L2 ID is the special L2 ID of the relay UE, then the special L2 ID is the destination L2 ID corresponding to the request message sent by the remote UE.
  • the special L2 ID can also be the destination L2 ID corresponding to the discovery message sent by the relay UE.
  • the source L2 ID if the special L2 ID is the special L2 ID of the remote UE, then the special L2 ID is the source L2 ID corresponding to the request message sent by the remote UE.
  • the relay UE determines that the L2 ID corresponding to the request message is a special L2 ID, the relay UE determines that it needs to provide relay services to the remote UE based on the special L2 ID, and learns that it needs to enter the RRC connection state.
  • the relay UE When the relay UE determines that the L2 ID corresponding to the request message is a common L2 ID other than the special L2 ID, and the service type corresponding to the common L2 ID is a device to device (D2D) service type, the relay UE will Ordinary L2 ID determines the need to provide D2D communication services for the remote UE.
  • D2D device to device
  • the remote UE can also send an RRC reconfiguration completion message (ie, step c) to the base station through the interface between the remote UE and the base station to inform the base station that the remote UE has reconfigured the base station. Configuration completed.
  • RRC reconfiguration completion message ie, step c
  • the order between step 602a and step c in Figure 6(c) is not limited.
  • the remote UE may also forward the RRC reconfiguration complete message through the relay UE.
  • the indication information in the request message may be used to indicate that the unicast connection is established to obtain the relay service of the relay UE, thereby triggering the relay UE to enter the RRC connection state.
  • the above indication information may not be carried in the above request message, but the request message itself indicates that the establishment of the unicast connection is to obtain the relay service of the relay UE.
  • the request message can be understood as an indication information. Therefore, on the one hand, the request message is used to request the establishment of a unicast connection, and on the other hand, it triggers the relay UE to enter the RRC connection state.
  • the indication information is PC5-S signaling, PC5 RRC message or sidelink medium access control control element (SL MAC CE) signaling.
  • Figure 6(d) is a schematic flowchart of a communication method provided by an embodiment of the present application. This method is expanded on the basis of the embodiment of Figure 6(a), and the embodiment of Figure 6(d) is a specific implementation solution of the embodiment of Figure 6(a).
  • the indication information in Figure 6(d) is not carried in the unicast connection establishment request message or the unicast connection establishment reply message, and the indication information is not an RRC reconfiguration complete message, but a unicast connection establishment request message. broadcast messages or signaling.
  • the remote UE also needs to send an RRC reconfiguration completion message (ie, step e) to the base station through the interface between the remote UE and the base station to inform the base station that the remote UE has re-configured the base station. Configuration completed.
  • the order between step 602a and step e in Figure 6(d) is not limited.
  • the remote UE may also forward the RRC reconfiguration complete message through the relay UE.
  • the remote UE before step 602a, if a unicast connection is not established between the remote UE and the relay UE, the remote UE first establishes a unicast connection with the relay UE ( That is, step d), specifically, the remote UE sends a unicast connection establishment request message or a unicast connection establishment reply message to the relay UE to request the establishment of a unicast connection.
  • Figure 6(e) is a schematic flow chart of a communication method provided by an embodiment of the present application.
  • the remote UE determines the RRC status of the relay UE (ie, step f).
  • the RRC reconfiguration message of step 601a carries indication information for indicating the RRC status of the relay UE, or the remote UE determines the RRC status of the relay UE.
  • the end UE receives a discovery message from the relay UE, and the discovery message carries the RRC status of the relay UE.
  • the RRC state of the relay UE is the RRC connected state. Therefore, the base station has been able to obtain the information of the relay UE.
  • the remote UE sends an RRC reconfiguration completion message to the base station through the interface between the remote UE and the base station, and the base station sends an RRC reconfiguration message to the relay UE.
  • the content carried in the RRC reconfiguration message can refer to the aforementioned step 604a. description of.
  • the remote UE if a unicast connection is not established between the relay UE and the remote UE, the remote UE also needs to establish a unicast connection with the relay UE.
  • step 602a, step 603a and step 604a need to be performed.
  • Scenario 2 is a specific implementation of the embodiment of Figure 6(a) above, and various implementation methods of the indication information in Scenario 2 can refer to Figures 6(b), 6(c) and The embodiment of Figure 6(d) will not be described again.
  • a link failure or connection failure occurs between the remote UE and the relay UE, or a link failure or connection failure occurs between the remote UE and the base station during the process of configuring multipath for the remote UE, If the connection fails, or the link or connection failure between the base station and the relay UE occurs, the remote UE needs to report to the base station.
  • the remote UE determines that a link failure or connection failure occurs between the remote UE and the relay UE, and then sends first failure indication information to the base station, and the first failure indication information indicates that the remote UE and the relay UE A link failure or connection failure occurs.
  • the link failure can be PC5 RLF
  • the connection failure can be Bluetooth connection failure or WiFi connection failure, etc.
  • RLF refers to radio link failure.
  • the remote UE determines that a link failure or connection failure occurs between the remote UE and the base station, and then sends second failure indication information to the base station through the relay UE, and the second failure indication information indicates that the remote UE A link failure or connection failure occurs with the base station.
  • the link failure can be Uu RLF
  • the connection failure can be non-3GPP connection failure, etc.
  • the relay UE determines that a link failure or connection failure occurs between the relay UE and the base station, and then sends third failure indication information to the remote UE, and the third failure indication information indicates that the relay UE and the base station A link failure or connection failure occurs between the relay UE and the base station, and then the remote UE sends fourth failure indication information to the base station.
  • the fourth failure indication information indicates that a link failure or connection failure occurs between the relay UE and the base station.
  • the link failure can be Uu RLF
  • the connection failure can be non-3GPP connection failure, etc.
  • the remote UE or the base station can reselect the relay UE. , and then use the newly selected relay UE to reconfigure multipath for the remote UE. If a link failure or connection failure occurs between the remote UE and the base station, the remote UE can perform an RRC re-establishment process and complete the multipath configuration of the remote UE in this process.
  • Figure 6(f) is a schematic flowchart of another communication method provided by an embodiment of the present application. This method is to complete the multi-path configuration of the remote UE in the RRC re-establishment process of the remote UE. The method includes the following steps:
  • Step 601f The remote UE selects the relay UE.
  • the remote UE selects a UE as the relay UE from the cell where the remote UE is located.
  • the relay UE It may be the UE with the largest reference signal reception power in the cell, or any UE in the cell.
  • the remote UE can obtain the reference signal received power of the UE in the cell through the discovery process described above.
  • Step 602f The remote UE sends an RRC re-establishment request message to the base station.
  • the base station receives the RRC re-establishment request message.
  • Step 603f The remote UE establishes a unicast connection with the relay UE.
  • This step 603f is an optional step. When the remote UE has established a unicast connection with the relay UE, this step 603f does not need to be executed. When the remote UE and the relay UE do not establish a unicast connection, this step 603f needs to be executed.
  • Step 604f The relay UE sends the SUI to the base station. Accordingly, the base station receives the SUI.
  • the SUI includes information about the remote UE, or information about the relay UE and information about the remote UE.
  • Step 605f The base station sends an RRC re-establishment message to the remote UE.
  • the remote UE receives the RRC re-establishment message.
  • Step 606f The remote UE sends an RRC re-establishment completion message to the base station.
  • the base station receives the RRC re-establishment complete message.
  • the RRC re-establishment completion message includes information about the relay UE, or information about the relay UE and information about the remote UE.
  • the information about the relay UE may include the destination L2 ID of the relay UE, and the information about the remote UE may include the source L2 ID of the remote UE.
  • the base station learns that the remote UE selects the relay UE for establishing a multipath connection for the remote UE. That is, based on the content in the SUI reported by the relay UE and the content in the RRC re-establishment completion message reported by the remote UE, the base station learns that both the relay UE and the remote UE support the establishment of multiplexing by the relay UE for the remote UE. path connection.
  • the SUI in the above step 604f includes the information of the relay UE and the information of the remote UE, and the RRC re-establishment completion message in the above step 606f includes the information of the relay UE and the information of the remote UE.
  • the SUI in the above step 604f includes the information of the relay UE and the information of the remote UE, and the RRC re-establishment completion message in the above step 606f includes the information of the relay UE.
  • the SUI in step 604f includes the information of the remote UE, and the RRC re-establishment completion message in step 606f includes the information of the relay UE and the information of the remote UE.
  • the SUI in step 604f includes the information of the remote UE, and the RRC re-establishment completion message in step 606f includes the information of the relay UE.
  • the base station also needs to send RRC reconfiguration messages to the remote UE and the relay UE respectively to complete the RRC configuration of the relay UE and the remote UE.
  • RRC reconfiguration message reference may be made to the description of the embodiment in Figure 6(a).
  • the base station can configure multi-path for the remote UE based on the information of the relay UE selected by the remote UE, which helps to achieve rapid multi-path configuration of the remote UE.
  • FIG. 7 is a specific example of the embodiment of FIG. 6(a) or FIG. 6(e)
  • the embodiment of FIG. 9 is a specific example of the embodiment of FIG. 6(f) .
  • FIG. 7 is a schematic flowchart of a communication method provided by an embodiment of the present application. The method includes the following steps:
  • Step 701 The remote UE searches for nearby available UEs through a discovery process.
  • the remote UE can use the above-mentioned model A or model B method to find nearby available UEs.
  • Available UEs refer to UEs that can provide relay services for remote UEs.
  • Step 702a The base station sends measurement configuration information to the remote UE.
  • Step 702b The remote UE performs measurements according to the measurement configuration information to obtain the measurement results, and sends the measurement results to the base station.
  • the measurement results include the source L2 ID of one or more UEs, the RSRP of the one or more UEs, and the identity of the serving cell of the one or more UEs.
  • step 701 can also be executed after step 702a, so the remote UE can simultaneously discover and measure UEs surrounding the remote UE.
  • the remote UE can detect the UEs by receiving discovery messages from surrounding UEs. Discovery message is used to measure the signal quality of the UE.
  • Step 703 The base station determines to configure multipath for the remote UE based on the measurement results, and selects a relay UE for establishing an indirect link for the remote UE.
  • Step 704 The base station sends an RRC reconfiguration message to the remote UE.
  • step 601a For the content in the RRC reconfiguration message, please refer to the description of step 601a.
  • Step 705 The remote UE establishes a unicast connection with the relay UE.
  • step 705 the following steps 706a to 708a and step 709 are performed, or the following steps 706b to step 708b and step 709 are performed. That is, step 706a to step 708a and step 706b to step 708b are performed as an alternative. Among them, the following steps 706a to 708a are called method one, and the following steps 706b to step 708b are called method two.
  • the remote UE and the relay UE are caused to perform the method 1 or the method 2 by predefining or preconfiguring the remote UE.
  • the remote UE can also decide to perform method one or method two on its own.
  • the remote UE can learn that the RRC state of the relay UE is the RRC connected state, the remote UE can send an RRC reconfiguration to the base station through the interface between the remote UE and the base station.
  • the completion message does not need to trigger the relay UE to enter the RRC connected state. That is, only step 706a needs to be executed, but steps 707a and 708a do not need to be executed.
  • Step 706a The remote UE sends an RRC reconfiguration completion message to the base station through the Uu link.
  • the RRC reconfiguration complete message indicates that the remote UE successfully received the multipath configuration information.
  • the multipath configuration information is the information contained in the above-mentioned RRC reconfiguration message.
  • Step 707a The remote UE sends indication information to the relay UE, and the indication information triggers the relay UE to enter the RRC connected state.
  • Step 708a The relay UE is triggered to enter the RRC connection state and sends sidelink user information (SUI) to the base station.
  • SAI sidelink user information
  • the SUI contains one or more of the source L2 ID of the relay UE, the destination L2 ID of the remote UE, or indication information.
  • the indication information is used to request the base station to allocate a local identity (Local ID) to the remote UE.
  • Step 706b The remote UE sends an RRC reconfiguration complete message to the relay UE.
  • Step 707b The relay UE is triggered to enter the RRC connected state and sends the SUI to the base station.
  • the SUI contains the source L2 ID of the relay UE, the destination L2 ID of the remote UE and indication information.
  • the indication information is used to request the base station to allocate a local identity (Local ID) to the remote UE.
  • Step 708b The relay UE forwards the RRC reconfiguration completion message from the remote UE to the base station.
  • the base station when the base station configures multipath for the remote UE, the base station can define the above method one (involving steps 706a to 708a) to trigger the relay UE to enter the RRC connected state. At this time, the Uu link between the remote UE and the base station SRB bearer is configured on it. In another possible implementation, the base station is not restricted from configuring SRB, so the following three situations may exist:
  • the base station only configures SRB on the direct link, then the remote UE replies with the RRC reconfiguration complete message through the above method 1 (involving steps 706a to 708a) and triggers the relay UE to enter the RRC connected state.
  • Scenario 2 The base station configures SRB split/duplication, that is, the same SRB message can be transmitted on the direct link and the indirect link at the same time. Then the remote UE can use the above method 1 (involving steps 706a to 708a) And/or method two (involving the above steps 706b to 708b) replies with an RRC reconfiguration complete message. The specific choice of which method can be left to the UE implementation.
  • the remote UE replies to the RRC reconfiguration complete message on both the direct link and the indirect link, there is no need to trigger the relay UE to enter the RRC connected state through the above step 707a, but to trigger the relay through the RRC reconfiguration complete message.
  • the UE enters the RRC connected state.
  • Scenario 3 The base station only configures SRB on the indirect link, and the remote UE replies with the RRC reconfiguration complete message and triggers the relay UE to enter the RRC connected state through the above method two (involving steps 706b to 708b).
  • Step 709 The base station sends an RRC reconfiguration message to the relay UE.
  • the remote UE when the relay UE selected by the base station for the remote UE is in the RRC idle state or RRC deactivation state, the remote UE can reply to the base station with an RRC reconfiguration completion message through the Uu link between the remote UE and the base station. And the remote UE also triggers the relay UE to enter the RRC connection state, thereby ensuring that multipath is successfully configured for the remote UE, which helps to improve the communication quality of the remote UE.
  • the base station can send notification information to the relay UE.
  • the notification information is used to determine whether the relay UE needs to be the remote UE.
  • Forward control plane signaling The relay UE may determine whether control plane signaling needs to be forwarded to the remote UE based on the notification information.
  • the notification information please refer to the relevant description in the embodiment of FIG. 6(a) and will not be described again.
  • the RRC reconfiguration message in step 709 can include the notification information, or the base station and the relay can communicate with each other through the base station. This notification information is sent in an other message between UEs.
  • link failure or connection failure may occur.
  • link failure occurs or the connection If it fails, corresponding processing needs to be done to ensure that multipath is successfully configured for the remote UE. Different situations are explained below.
  • Example 1 During the process of establishing a unicast connection between the remote UE and the relay UE or after the establishment of the unicast connection is completed, the remote UE detects that PC5 RLF occurs between the remote UE and the relay UE.
  • Figure 8(a) is a schematic diagram of PC5 RLF occurring between the remote UE and the relay UE.
  • PC5 RLF occurs between the remote UE and the relay UE, causing the remote UE to be unable to use the relay service of the relay UE.
  • the remote UE detects that PC5 RLF occurs between the remote UE and the relay UE, if the direct link between the remote UE and the base station is configured with an SRB bearer, the remote UE can pass the SRB The bearer sends indication information to the base station.
  • the indication information indicates that PC5 RLF occurs between the remote UE and the relay UE, thereby triggering the reselection of the relay UE for the remote UE and multi-path configuration.
  • the specific process can be referred to the implementation of Figure 7.
  • the remote UE can trigger the re-establishment process and Perform multipath configuration for the remote UE during the re-establishment process.
  • the re-establishment process reference may be made to the embodiment of FIG. 9 .
  • Example 2 When the remote UE replies to the base station with an RRC reconfiguration completion message through a direct link, the link quality between the remote UE and the relay UE is poor, causing the remote UE to be unable to reply to the base station with an RRC reconfiguration completion message. , that is, a link failure occurs between the remote UE and the base station.
  • Figure 8(b) is a schematic diagram of a link failure occurring between the remote UE and the relay UE.
  • the remote UE detects a link failure between the remote UE and the relay UE, if the indirect link between the remote UE and the base station is configured with an SRB bearer, the remote UE can pass the SRB bearer.
  • the SRB bearer sends indication information to the base station. The indication information indicates that a link failure occurs between the remote UE and the relay UE, thereby triggering the base station to re-establish a connection with the remote UE.
  • the remote UE cannot notify the base station through the indirect link that a link failure occurs between the remote UE and the relay UE. Therefore, the remote UE can trigger Re-establish the process, and perform multi-path configuration for the remote UE in the re-establishment process.
  • the re-establishment process reference may be made to the embodiment of FIG. 9 .
  • Example 3 Uu RLF occurs between the relay UE and the base station.
  • FIG 8(c) is a schematic diagram of Uu RLF occurring between the relay UE and the base station.
  • Uu RLF occurs after the relay UE has established a wireless connection with the base station, causing the remote UE to be unable to use the relay service of the relay UE.
  • the relay UE detects Uu RLF between the relay UE and the base station, it sends indication information to the remote UE.
  • the indication information indicates that Uu RLF occurs between the relay UE and the base station.
  • the remote UE is receiving After receiving the indication information, if the direct link between the remote UE and the base station is configured with an SRB bearer, the remote UE can send indication information to the base station through the SRB bearer.
  • the indication information indicates the connection between the relay UE and the base station.
  • the occurrence of Uu RLF triggers reselection of the relay UE for the remote UE and performs multi-path configuration.
  • the remote UE cannot inform the base station that Uu RLF occurs between the relay UE and the base station. Therefore, the remote UE can trigger the re-establishment process and perform the re-establishment process.
  • multipath configuration is performed for the remote UE.
  • the remote UE may release the unicast connection with the relay UE.
  • Example 4 RRC setup failure occurs between the relay UE and the base station.
  • FIG 8(d) and Figure 8(e) are schematic diagrams of RRC establishment failure between the relay UE and the base station.
  • An RRC establishment failure occurs when the relay UE establishes a wireless connection with the base station, causing the remote UE to be unable to use the relay service of the relay UE.
  • the relay UE detects that the RRC establishment failure occurs between the relay UE and the base station, it sends indication information to the remote UE.
  • the indication information indicates that the RRC establishment failure occurs between the relay UE and the base station.
  • the indication information It can be a PC5 RRC message.
  • the remote UE After the remote UE receives the indication information, if the direct link between the remote UE and the base station is configured with an SRB bearer, the remote UE can send the indication information to the base station through the SRB bearer.
  • This indication information indicates that an RRC establishment failure occurs between the relay UE and the base station, thereby triggering re-selection of the relay UE for the remote UE and performing multi-path configuration.
  • the specific process may refer to the aforementioned embodiment in Figure 7, or may also follow other methods. Perform multipath configuration for remote UE. If the SRB bearer is not configured on the direct link between the remote UE and the base station, the remote UE cannot inform the base station that an RRC establishment failure occurred between the relay UE and the base station.
  • the remote UE can trigger the re-establishment process and During the re-establishment process, multipath configuration is performed for the remote UE.
  • the re-establishment process reference may be made to the embodiment of FIG. 9 .
  • the remote UE may release the unicast connection with the relay UE.
  • FIG. 9 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • This method is a re-establishment process for a remote UE, and in this process multipath is configured for the remote UE.
  • the method includes the following steps:
  • Step 901 The remote UE selects a suitable cell and the relay UE in the cell.
  • step 601f the description of step 601f in Figure 6(f).
  • Step 902 The remote UE sends an RRC re-establishment request message to the base station through the Uu interface.
  • the base station refers to the base station where the appropriate cell selected by the remote UE is located. This base station may be the same as the base station that the remote UE accessed before sending the RRC re-establishment request message, or may be different.
  • base station 1 When the base station (hereinafter referred to as base station 1) is different from the base station (hereinafter referred to as base station 2) that the remote UE accessed before sending the RRC re-establishment request message, the base station 1 can obtain the context of the remote UE from base station 2 information.
  • Step 903 When there is no unicast connection between the remote UE and the selected relay UE, the remote UE establishes a unicast connection with the relay UE.
  • Step 904 The relay UE sends the SUI to the base station.
  • Step 905 The base station sends an RRC re-establishment message to the remote UE.
  • Step 906a The base station sends an RRC reconfiguration message to the relay UE.
  • Step 906b The relay UE sends an RRC reconfiguration complete message to the base station.
  • Step 907 The remote UE sends an RRC re-establishment completion message to the base station.
  • Step 908 The base station sends an RRC reconfiguration message to the remote UE.
  • Step 909 The remote UE sends an RRC reconfiguration complete message to the base station.
  • the relay UE selected by the remote UE is in the same cell as the remote UE.
  • a relay UE that is not in the same cell as the remote UE can also be selected. This application is applicable to This is not limited.
  • the remote UE selects the relay UE.
  • the remote UE can also report the measured information of multiple UEs to the base station through the RRC re-establishment completion message, and the base station Select one UE from the plurality of UEs as the relay UE.
  • the base station After completing the re-establishment process of the remote UE, the base station configures multipath for the remote UE according to the selected relay UE.
  • the remote terminal equipment, relay terminal equipment or access network equipment includes corresponding hardware structures and/or software modules for executing each function.
  • Those skilled in the art should easily realize that the units and method steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.
  • Figures 10 and 11 are schematic structural diagrams of possible communication devices provided by embodiments of the present application. These communication devices can be used to implement the above-mentioned Figures 6(a), 6(b), 6(c), 6(d), 6(e), 6(f), as well as Figures 7 and 9
  • the functions of the remote terminal equipment, relay terminal equipment or access network equipment in the method embodiments can also be achieved, so the beneficial effects of the above method embodiments can also be achieved.
  • the communication device may be a remote terminal device, a relay terminal device, or an access network device, or may be a module (such as chips).
  • the communication device 1000 shown in FIG. 10 includes a processing unit 1010 and a transceiver unit 1020.
  • the communication device 1000 is used to implement the functions of remote terminal equipment, relay terminal equipment or access network equipment in the above method embodiments.
  • the transceiver unit 1020 is used to receive data from the access network device through the interface between the remote terminal device and the access network device.
  • Configuration message the configuration message includes the information of the relay terminal device, the configuration message is used for RRC reconfiguration; the remote terminal device sends instruction information to the relay terminal device according to the information of the relay terminal device, the instruction information Trigger the relay terminal device to enter the RRC connection state.
  • the processing unit 1010 is configured to determine, according to the RRC state of the relay terminal device, the need to trigger the relay terminal device to enter the RRC connection state.
  • the configuration message also includes status information indicating the RRC status of the relay terminal device; the remote terminal device determines the RRC status of the relay terminal device based on the status information.
  • the indication information is the configuration completion message.
  • the transceiver unit 1020 is configured to send the configuration completion message to the access network device through an interface between the remote terminal device and the access network device.
  • the transceiver unit 1020 is configured to send a request message to the relay terminal device.
  • the request message is used to request the establishment of a unicast connection.
  • the request message includes the instruction information, and the instruction information indicates the establishment of a unicast connection.
  • the connection is to obtain the relay service of the relay terminal device.
  • the indication information is PC5-S signaling, PC5 RRC message or SL MAC CE signaling.
  • the processing unit 1010 is configured to determine that a link failure or connection failure occurs between the remote terminal device and the relay terminal device; and the transceiver unit 1020 is configured to send a third message to the access network device.
  • a failure indication information, the first failure indication information indicates that a link failure or a connection failure occurs between the remote terminal device and the relay terminal device.
  • the processing unit 1010 is used to determine that a link failure or connection failure occurs between the remote terminal device and the access network device; and the transceiver unit 1020 is used to send a message to the remote terminal device through the relay terminal device.
  • the access network device sends second failure indication information, and the second failure indication information indicates that a link failure or connection failure occurs between the remote terminal device and the access network device.
  • the transceiver unit 1020 is configured to receive third failure indication information from the relay terminal device, where the third failure indication information indicates that a link occurs between the relay terminal device and the access network device.
  • the link fails or the connection fails; and fourth failure indication information is sent to the access network device, and the fourth failure indication information indicates that a link failure or connection failure occurs between the relay terminal device and the access network device.
  • the transceiver unit 1020 is also configured to send information about at least one candidate terminal device to the access network device through an interface between the remote terminal device and the access network device.
  • the terminal device includes the relay terminal device, and the information of the at least one candidate terminal device includes signal quality of the candidate terminal device and/or information indicating whether the candidate terminal device supports multi-path relay.
  • the transceiver unit 1020 is also configured to receive a discovery message from the candidate terminal device, where the discovery message includes information indicating whether the candidate terminal device supports multi-path relay.
  • the transceiver unit 1020 is also configured to receive a discovery message from the candidate terminal device.
  • the identification information of the candidate terminal device corresponding to the discovery message is used to indicate whether the candidate terminal device supports multi-path relay. .
  • the transceiver unit 1020 is used to receive instruction information from the remote terminal device, and the instruction information triggers the access network device to enter the RRC connection state; Send side link user information to the access network device, where the side link user information includes information about the remote terminal device and/or information about the relay terminal device.
  • the processing unit 1010 is configured to enter the RRC connection state according to the indication information.
  • the indication information is PC5-S signaling, PC5 RRC message, SL MAC CE signaling or a configuration completion message from the relay terminal device.
  • the transceiver unit 1020 is configured to receive a request message from the remote terminal device.
  • the request message is used to request the establishment of a unicast connection.
  • the request message includes the instruction information, and the instruction information indicates the establishment of a unicast connection.
  • the broadcast connection is to obtain the relay service of the relay terminal device.
  • the transceiver unit 1020 is used to receive notification information from the access network device.
  • the notification information is used by the relay terminal device to determine whether control plane signaling needs to be forwarded for the remote terminal device; the processing unit 1010, used to determine, based on the notification information, that control plane signaling needs to be forwarded for the remote terminal device, or that control plane signaling does not need to be forwarded for the remote terminal device.
  • the processing unit 1010 is used to determine that a link failure or connection failure occurs between the relay terminal device and the access network device; the transceiver unit 1020 is used to send failed messages to the remote terminal device.
  • Indication information indicates that a link failure or connection failure occurs between the relay terminal device and the access network device.
  • the transceiver unit 1020 is also configured to send a discovery message to the remote terminal device, where the discovery message includes information indicating that the relay terminal device supports multi-path relay.
  • the transceiver unit 1020 is also configured to send a discovery message to the remote terminal device.
  • the identification information of the relay terminal device corresponding to the discovery message is used to indicate that the relay terminal device supports multi-path. Continue.
  • the transceiver unit 1020 is used to send a configuration message to the remote terminal device through the interface between the remote terminal device and the access network device,
  • the configuration message includes information and status information of the relay terminal equipment.
  • the status information indicates the RRC status of the relay terminal equipment.
  • the configuration message is used for RRC reconfiguration; receiving side link user information from the relay terminal equipment,
  • the side link user information includes the information of the relay terminal device and the information of the relay terminal device. interest.
  • the transceiver unit 1020 is configured to receive a configuration completion message from the remote terminal device in response to the configuration message through an interface between the remote terminal device and the access network device.
  • the transceiver unit 1020 is configured to receive a configuration completion message from the remote terminal device in response to the configuration message through the relay terminal device.
  • the transceiver unit 1020 is configured to send notification information to the relay terminal device.
  • the notification information is used by the relay terminal device to determine whether control plane signaling needs to be forwarded to the remote terminal device.
  • the second Configuration messages are used for RRC reconfiguration.
  • the processing unit 1010 is used to select the relay terminal device; the transceiver unit 1020 is used to send an RRC re-establishment request message to the access network device; Receive an RRC re-establishment message from the access network device; send an RRC re-establishment completion message to the access network device, where the RRC re-establishment completion message includes information about the relay terminal device and/or information about the remote terminal device. .
  • the processing unit 1010 is configured to establish a unicast connection between the relay terminal devices before the transceiver unit 1020 sends the RRC re-establishment completion message to the access network device.
  • the communication device 1100 shown in FIG. 11 includes a processor 1110 and an interface circuit 1120.
  • the processor 1110 and the interface circuit 1120 are coupled to each other.
  • the interface circuit 1120 may be a transceiver or an input-output interface.
  • the communication device 1100 may also include a memory 1130 for storing instructions executed by the processor 1110 or input data required for the processor 1110 to run the instructions or data generated after the processor 1110 executes the instructions.
  • the communication device 1100 may be a remote terminal device, a relay terminal device or an access network device in the above method embodiment, or may be a module (such as a chip) applied to the remote terminal device, relay terminal device or access network device. ).
  • the processor 1110 is used to realize the function of the above processing unit 1010
  • the interface circuit 1120 is used to realize the function of the above transceiver unit 1020.
  • processor in the embodiment of the present application can be a central processing unit (CPU), or other general-purpose processor, digital signal processor (DSP), or application-specific integrated circuit (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • CPU central processing unit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor can be a microprocessor or any conventional processor.
  • FIG. 12 provides a schematic structural diagram of a terminal device.
  • the terminal device may be applicable to the operations performed by the remote terminal device or the relay terminal device in any of the above method embodiments.
  • FIG. 12 only shows the main components of the terminal device.
  • the terminal device 1200 shown in FIG. 12 includes a processor, a memory, a control circuit, an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control the entire terminal device, execute software programs, and process data of software programs.
  • Memory is mainly used to store software programs and data.
  • the control circuit is mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals.
  • Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.
  • the processor can read the software program in the memory, parse and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent and outputs the baseband signal to the control circuit.
  • the control circuit processes the baseband signal to obtain a radio frequency signal and sends the radio frequency signal outward in the form of electromagnetic waves through the antenna. send.
  • the control circuit receives the radio frequency signal through the antenna.
  • the radio frequency signal is further converted into a baseband signal and the baseband signal is output to the processor.
  • the processor converts the baseband signal into data and performs processing on the data. deal with.
  • Figure 12 shows only one memory and processor. In an actual terminal device, there may be multiple processors and memories.
  • the memory may also be called a storage medium or a storage device, which is not limited in the embodiments of the present application.
  • the processor may include a baseband processor and a central processor.
  • the baseband processor is mainly used to process communication protocols and communication data.
  • the central processor is mainly used to control and execute the entire terminal device.
  • the software program processes the data of the software program.
  • the processor in Figure 12 integrates the functions of a baseband processor and a central processor.
  • the baseband processor and the central processor can also be independent processors and are interconnected through technologies such as buses.
  • the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses.
  • a baseband processor can also be described as a baseband processing circuit or baseband processor. With processing chip.
  • the central processing unit can also be described as a central processing circuit or a central processing chip.
  • the function of processing communication protocols and communication data can be built into the processor, or can be stored in the memory in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the antenna and the control circuit with the transceiver function can be regarded as the transceiver unit 1211 of the terminal device 1200
  • the processor with the processing function can be regarded as the processing unit 1212 of the terminal device 1200
  • the terminal device 1200 includes a transceiver unit 1211 and a processing unit 1212.
  • the transceiver unit may also be called a transceiver, a transceiver, a transceiver device, etc.
  • the devices used to implement the receiving function in the transceiver unit 1211 can be regarded as a receiving unit
  • the devices used in the transceiver unit 1211 used to implement the transmitting function can be regarded as a transmitting unit.
  • the transceiver unit 1211 includes a receiving unit and a transmitting unit.
  • the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc.
  • the sending unit may be called a transmitter, a transmitter, a transmitting circuit, etc.
  • the above-mentioned receiving unit and sending unit may be one unit integrated together, or may be multiple independent units.
  • the above-mentioned receiving unit and sending unit may be located in one geographical location, or may be dispersed in multiple geographical locations.
  • Embodiments of the present application also provide a communication device, including a processor coupled to a memory.
  • the processor is configured to call a program stored in the memory to execute the remote terminal equipment, relay terminal equipment, or Operations performed by access network equipment.
  • the memory may be located within the device or external to the device.
  • the processor can be one or more.
  • An embodiment of the present application provides a communication device, including a processor and a memory; the memory is used to store computer instructions.
  • the processor executes the computer instructions stored in the memory to execute the remote control in the above method embodiment. Operations performed by end terminal equipment, relay terminal equipment or access network equipment.
  • Embodiments of the present application also provide a chip system, including: a processor, configured to perform operations performed by remote terminal equipment, relay terminal equipment, or access network equipment in the above method embodiments.
  • An embodiment of the present application also provides a communication system, including the remote terminal device and the relay terminal device in the above method embodiment.
  • the communication system also includes the access network device in this method embodiment.
  • Embodiments of the present application also provide a computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When it is run on a communication device, instructions are executed by the remote terminal device and the relay in the above method embodiments. Operations performed by terminal equipment or access network equipment.
  • Embodiments of the present application also provide a computer program product.
  • the computer program product includes a computer program or instructions.
  • the computer program or instructions are run by a communication device, the computer program or instructions are executed by the remote terminal equipment and the relay terminal equipment in the above method embodiments. Or operations performed by access network equipment.
  • the method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory In memory, register, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage media may be located in an ASIC. Additionally, the ASIC can be located in the base station or terminal. Of course, the processor and the storage medium may also exist as discrete components in the base station or terminal.
  • the computer program product includes one or more computer programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a base station, a user equipment, or other programmable device.
  • the computer program or instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another.
  • the computer program or instructions may be transmitted from a website, computer, A server or data center transmits via wired or wireless means to another website site, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media.
  • the available media may be magnetic media, such as floppy disks, hard disks, and tapes; optical media, such as digital video optical disks; or semiconductor media, such as solid-state hard drives.
  • the computer-readable storage medium may be volatile or nonvolatile storage media, or may include both volatile and nonvolatile types of storage media.
  • association relationship of objects means that there can be three kinds of relationships.
  • a and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.
  • the character “/” generally indicates that the related objects before and after are an “or”relationship; in the formula of this application, the character "/" indicates that the related objects before and after are a kind of "division” Relationship.

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Abstract

本申请提供一种通信方法、通信装置及通信系统。该方法，在为远端终端设备配置中继终端设备时，远端终端设备通过远端终端设备与接入网设备之间的接口接收中继终端设备的信息，然后远端终端设备向该中继终端设备发送指示信息，该指示信息能够触发中继终端设备进入RRC连接态，从而该中继终端设备可以为远端终端设备提供中继服务，保障成功地为远端终端设备配置远端终端设备与接入网设备之间的多个路径，从而能够提升远端终端设备与接入网设备之间通信的可靠性，提升了服务质量和用户体验。

Description

一种通信方法、通信装置及通信系统
相关申请的交叉引用
本申请要求在2022年08月02日提交中国专利局、申请号为202210920848.0、申请名称为“一种通信方法、通信装置及通信系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种通信方法、通信装置及通信系统。
背景技术
在一些应用场景中，需要用到中继技术，即一个终端设备可以协助另一个终端设备与接入网设备进行通信，具体的，远端终端设备通过中继终端设备的协作与接入网设备进行通信。
而在另一些应用场景中，可能需要为终端设备配置多路径，即远端终端设备既可以直接与接入网设备通信，也可以通过中继终端设备的协作与接入网设备进行通信。
在为终端设备配置多路径的场景中，如何保障多路径的成功配置，有待解决。
发明内容
本申请提供一种通信方法、通信装置及通信系统，用以保障成功地为终端设备配置终端设备与接入网设备之间的多个路径。
第一方面，本申请实施例提供一种通信方法，该方法可以由远端终端设备或应用于远端终端设备中的模块(如芯片)来执行。以远端终端设备执行该方法为例，该方法包括：远端终端设备通过该远端终端设备与接入网设备之间的接口，接收来自该接入网设备的配置消息，该配置消息包括中继终端设备的信息，该配置消息用于RRC重配置；该远端终端设备根据该中继终端设备的信息，向该中继终端设备发送指示信息，该指示信息触发该中继终端设备进入RRC连接态。
上述方案，接入网设备与远端终端设备之间存在直连路径，在为远端终端设备配置中继终端设备时，远端终端设备通过远端终端设备与接入网设备之间的接口接收中继终端设备的信息，然后远端终端设备向该中继终端设备发送指示信息，该指示信息能够触发中继终端设备进入RRC连接态，从而该中继终端设备可以为远端终端设备提供中继服务，保障成功地为远端终端设备配置远端终端设备与接入网设备之间的多个路径，从而能够提升远端终端设备与接入网设备之间通信的可靠性，提升了服务质量和用户体验。
一种可能的实现方法中，该远端终端设备根据该中继终端设备的RRC状态，确定需要触发该中继终端设备进入RRC连接态。
该方案，远端终端设备根据中继终端设备的RRC状态，判断是否需要触发该中继终端设备进入RRC连接态。如果不需要触发该中继终端设备进入RRC连接态，则远端终端设备可以不需要发送用于触发该中继终端设备进入RRC连接态的指示信息，从而节约信令开销。如果需要触发该中继终端设备进入RRC连接态，则发送该指示信息，保证能够触发该中继终端设备进入RRC连接态，从而保障成功地为远端终端设备配置远端终端设备与接入网设备之间的多个路径，从而能够提升远端终端设备与接入网设备之间通信的可靠性，提升了服务质量和用户体验。
一种可能的实现方法中，该配置消息还包括状态信息，该状态信息指示该中继终端设备的RRC状态；远端终端设备根据所述状态信息，确定中继终端设备的RRC状态。
该方案，远端终端设备可以根据状态信息准确地获知中继终端设备的RRC状态。基站在配置消息中携带状态信息，不需要通过额外的消息携带状态信息，可以节约信令开销。
又一种实现方法中，该状态信息是携带于一个不同于上述配置消息的其它消息中发送至远端终端设备。本申请不限定接入网设备向远端终端设备发送状态信息的具体方式。
一种可能的实现方法中，该指示信息是响应于配置消息的配置完成消息。
该方案，通过配置完成消息触发该中继终端设备进入RRC连接态，不需要发送额外的消息触发该中继终端设备进入RRC连接态，可以节约信令开销。
一种可能的实现方法中，该远端终端设备通过该远端终端设备与该接入网设备之间的接口，向该接入网设备发送该配置完成消息。其中，该远端终端设备与该接入网设备之间的接口可以是Uu空口。
一种可能的实现方法中，该远端终端设备向该中继终端设备发送指示信息，包括：该远端终端设备向该中继终端设备发送请求消息，该请求消息包括该指示信息，该请求消息用于请求建立单播连接，该指示信息指示建立单播连接是为了获取该中继终端设备的中继服务。该请求消息可以是单播连接建立请求消息或单播连接建立回复消息。
该方案，通过请求消息携带指示信息，不需要发送额外的消息来携带指示信息，可以节约信令开销。
一种可能的实现方法中，该指示信息是用于请求建立与中继服务相关的单播连接的请求消息。
一种可能的实现方法中，该指示信息是PC5-S信令、PC5 RRC消息或边链路媒体接入控制控制单元SL MAC CE信令。
一种可能的实现方法中，该远端终端设备确定该远端终端设备与该中继终端设备之间发生链路失败或连接失败，向该接入网设备发送第一失败指示信息，该第一失败指示信息指示该远端终端设备与该中继终端设备之间发生链路失败或连接失败。
该方案，在为远端终端设备配置多路径的过程或配置多路径完成之后，如果远端终端设备与该中继终端设备之间建立了连接，但后续远端终端设备与该中继终端设备之间又发生链路失败或连接失败，则通知该接入网设备，有助于避免错误的执行多路径配置。后续，接入网设备可以重新为该远端终端选择中继终端设备，并配置接入网设备、新的中继终端设备以及远端终端设备之间的链路。
一种可能的实现方法中，该远端终端设备确定该远端终端设备与该接入网设备之间发生链路失败或连接失败，通过该中继终端设备向该接入网设备发送第二失败指示信息，该第二失败指示信息指示该远端终端设备与该接入网设备之间发生链路失败或连接失败。
该方案，在为远端终端设备配置多路径的过程或配置多路径完成之后，如果远端终端设备与接入网设备之间建立了连接，但后续远端终端设备与接入网设备之间又发生链路失败或连接失败，则通知该接入网设备，从而接入网设备可以进行后续处理，例如可以为远端终端设备选择合适的小区，并配置远端终端设备和接入网设备之间的链路。
一种可能的实现方法中，该远端终端设备接收来自该中继终端设备的第三失败指示信息，该第三失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败；该远端终端设备向该接入网设备发送第四失败指示信息，该第四失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
该方案，在为远端终端设备配置多路径的过程或配置多路径完成之后，如果中继终端设备与接入网设备之间建立了连接，但后续中继终端设备与接入网设备之间又发生链路失败或连接失败，则通知该接入网设备，有助于接入网设备能够及时感知中继终端设备与接入网设备之间的链路不可用，并重新为该远端终端设备选择中继终端设备以及配置链路。
一种可能的实现方法中，该远端终端设备通过该远端终端设备与接入网设备之间的接口，向该接入网设备发送至少一个候选终端设备的信息，该至少一个候选终端设备包括该中继终端设备，该至少一个候选终端设备的信息包括该候选终端设备的信号质量和/或用于指示该候选终端设备是否支持多路径中继的信息。
其中，用于指示该候选终端设备是否支持多路径中继的信息，可以是一个指示信息，或者是该候选终端设备的能力信息，该能力信息指示该候选终端设备支持多路径中继，或者不支持多路径中继。
上述方案，由远端终端设备向接入网设备提供一个或多个候选终端设备，然后接入网设备从中选择一个终端设备作为远端终端设备的中继终端设备，有助于实现为远端终端设备配置合适的中继终端设备。
一种可能的实现方法中，该远端终端设备接收来自候选终端设备的发现消息，该发现消息中包括用于指示候选终端设备是否支持多路径中继的信息。
一种可能的实现方法中，该远端终端设备接收来自该候选终端设备的发现消息，该发现消息对应的该候选终端设备的标识信息用于指示该候选终端设备是否支持多路径中继。
第二方面，本申请实施例提供一种通信方法，该方法可以由中继终端设备或应用于中继终端设备中的模块(如芯片)来执行。以中继终端设备执行该方法为例，该方法包括：中继终端设备接收来自远端终端设备的指示信息，该指示信息触发该中继终端设备进入RRC连接态；该中继终端设备向接入网设备发送边链路用户信息，该边链路用户信息包括该远端终端设备的信息和/或该中继终端设备的信息。
上述方案，中继终端设备接收来自远端终端设备的指示信息，该指示信息能够触发中继终端设备进入RRC连接态，从而该中继终端设备可以为远端终端设备提供中继服务，保障成功地为远端终端设备配置远端终端设备与接入网设备之间的多个路径，从而能够提升远端终端设备与接入网设备之间通信的可靠性，提升了服务质量和用户体验。
一种可能的实现方法中，该中继终端设备根据该指示信息，进入RRC连接态。
一种可能的实现方法中，该指示信息是PC5-S信令、PC5 RRC消息、SL MAC CE信令或来自所述中继终端设备的配置完成消息。
一种可能的实现方法中，该中继终端设备接收来自远端终端设备的指示信息，包括：该中继终端设备接收来自该远端终端设备的请求消息，该请求消息包括该指示信息，该请求消息用于请求建立单播连接，该指示信息指示建立单播连接是为了获取该中继终端设备的中继服务。
该方案，通过请求消息携带指示信息，不需要发送额外的消息来携带指示信息，可以节约信令开销。
一种可能的实现方法中，该指示信息是用于请求建立与中继服务相关的单播连接的请求消息。
一种可能的实现方法中，该中继终端设备接收来自该接入网设备的通知信息，该通知信息用于确定中继终端设备是否需要为远端终端设备转发控制面信令；该中继终端设备根据该通知信息，确定需要为远端终端设备转发控制面信令，或确定不需要为远端终端设备转发控制面信令。
该方案，当远端终端设备能够自己通过远端终端设备与接入网设备之间的接口接收接入网设备的控制面信令，则中继终端设备可以不需要监听并向中继终端设备转发该接入网设备发出的控制面信令，可以减少中继终端设备的信令开销。
一种可能的实现方法中，该中继终端设备确定该中继终端设备与该接入网设备之间发生链路失败或连接失败，向该远端终端设备发送失败指示信息，该失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
一种可能的实现方法中，该中继终端设备向该远端终端设备发送发现消息，该发现消息中包括用于指示该中继终端设备支持多路径中继的信息。
一种可能的实现方法中，该中继终端设备向该远端终端设备发送发现消息，该发现消息对应的该中继终端设备的标识信息用于指示该中继终端设备支持多路径中继。
第三方面，本申请实施例提供一种通信方法，该方法可以由接入网设备或应用于接入网设备中的模块(如芯片)来执行。以接入网设备执行该方法为例，该方法包括：接入网设备通过远端终端设备与接入网设备之间的接口，向远端终端设备发送配置消息，该配置消息包括中继终端设备的信息和状态信息，该配置消息用于RRC重配置，该状态信息指示该中继终端设备的RRC状态；该接入网设备通过远端终端设备与接入网设备之间的接口，接收来自该远端终端设备的响应于所述配置消息的配置完成消息；该接入网设备接收来自该中继终端设备的边链路用户信息，该边链路用户信息包括该中继终端设备的信息和该远端终端设备的信息。
上述方案，接入网设备为远端终端设备配置中继终端设备时，接入网设备向远端终端设备发送用于指示中继终端设备的RRC状态的状态信息，从而远端终端设备能够获知中继终端设备的RRC状态，进而远端终端设备可以判断是否需要去触发中继终端设备进入RRC连接态，使得该中继终端设备可以为远端终端设备提供中继服务，保障成功地为远端终端设备配置远端终端设备与接入网设备之间的多个路径，从而能够提升远端终端设备与接入网设备之间通信的可靠性，提升了服务质量和用户体验。
一种可能的实现方法中，该接入网设备通过远端终端设备与接入网设备之间的接口，接收来自远端终端设备的响应于配置消息的配置完成消息。
一种可能的实现方法中，该接入网设备通过中继终端设备，接收来自远端终端设备的响应于配置消息的配置完成消息。一种可能的实现方法中，该接入网设备向该中继终端设备发送通知信息，该通知信息用于确定中继终端设备是否需要为远端终端设备转发控制面信令。
该方案，当远端终端设备能够自己通过远端终端设备与接入网设备之间的接口接收来自接入网设备的控制面信令，则中继终端设备可以不需要监听并向中继终端设备转发该接入网设备发出的控制面信令，可以减少中继终端设备的信令开销。
一种可能的实现方法中，该接入网设备通过远端终端设备与该接入网设备之间的接口，接收来自该远端终端设备的至少一个候选终端设备的信息，该至少一个候选终端设备的信息包括该候选终端设备的信号质量和/或用于指示该候选终端设备是否支持多路径中继的信息；该接入网设备根据该至少一个候 选终端设备的信息，从该至少一个候选终端设备中选择该中继终端设备。
上述方案，由远端终端设备向接入网设备提供一个或多个候选终端设备，然后接入网设备从中选择一个终端设备作为远端终端设备的中继终端设备，有助于实现为远端终端设备配置合适的中继终端设备。
第四方面，本申请实施例提供一种通信方法，该方法可以由远端终端设备或应用于远端终端设备中的模块(如芯片)来执行。以远端终端设备执行该方法为例，该方法包括：远端终端设备选择中继终端设备；该远端终端设备向接入网设备发送RRC重建立请求消息；该远端终端设备接收来自该接入网设备的RRC重建立消息；该远端终端设备向该接入网设备发送RRC重建立完成消息，该RRC重建立完成消息包括该中继终端设备的信息和/或该远端终端设备的信息。
其中，该中继终端设备的信息可以包括中继终端设备的目标层2标识(L2 ID)。远端终端设备的信息可以包括远端终端设备的源层2标识(L2 ID)。
上述方案，在远端终端设备的重建立流程完成后，接入网设备可以基于远端终端设备选择的中继终端设备的信息，为远端终端设备配置多路径，有助于实现远端终端设备的多路径的快速配置。
一种可能的实现方法中，该远端终端设备向该接入网设备发送RRC重建立完成消息之前，该远端终端设备建立与该中继终端设备之间的单播连接，并触发中继终端设备上报中继终端设备的标识信息和/或远端终端设备的标识信息。
上述方案，接入网设备基于RRC重建立完成消息中的中继终端设备的信息和/或远端终端设备的信息，以及从中继终端设备接收到的中继终端设备的标识信息和/或远端终端设备的标识信息，为远端终端设备配置多路径中继，从而远端终端设备可以通过所述中继终端设备和接入网设备建立多路径中继。
一种可能的实现方法中，远端终端设备选择中继终端设备，具体包括：远端终端设备从所述远端终端设备所在的小区中选择一个终端设备作为中继终端设备。其中，该中继终端设备可以是该小区中参考信号接收功率最大的一个终端设备，或者是该小区中的任意一个终端设备。
当然，远端终端设备选择的中继终端设备与该远端终端设备也可以不在同一个小区，但远端终端设备所在的小区与中继终端设备所在的小区属于同一个接入网设备。
第五方面，本申请实施例提供一种通信方法，该方法可以由远端终端设备或应用于远端终端设备中的模块(如芯片)来执行。以远端终端设备执行该方法为例，该方法包括：远端终端设备确定远端终端设备与中继终端设备之间发生链路失败或连接失败，向接入网设备发送第一失败指示信息，该第一失败指示信息指示该远端终端设备与该中继终端设备之间发生链路失败或连接失败。
该方案，如果远端终端设备与该中继终端设备之间建立了连接，但后续远端终端设备与该中继终端设备之间又发生链路失败或连接失败，则通知该接入网设备，接入网设备可以快速重新建立远端终端设备与中继终端设备之间的链路，或者接入网设备重新选择一个中继终端设备并建立相应多路径中继，有助于实现为远端终端设备提供高质量的服务保障。
一种可能的实现方法中，该远端终端设备确定该远端终端设备与该接入网设备之间发生链路失败或连接失败，通过该中继终端设备向该接入网设备发送第二失败指示信息，该第二失败指示信息指示该远端终端设备与该接入网设备之间发生链路失败或连接失败。
该方案，如果远端终端设备与该接入网设备之间建立了连接，但后续远端终端设备与该接入网设备之间又发生链路失败或连接失败，则通知该接入网设备，接入网设备可以快速重新建立远端终端设备与接入网设备之间的链路，有助于实现为远端终端设备提供高质量的服务保障。
一种可能的实现方法中，该远端终端设备接收来自该中继终端设备的第三失败指示信息，该第三失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败；该远端终端设备向该接入网设备发送第四失败指示信息，该第四失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
该方案，如果中继终端设备与接入网设备之间建立了连接，但后续中继终端设备与接入网设备之间又发生链路失败或连接失败，则通知该接入网设备，接入网设备可以快速重新建立中继终端设备与接入网设备之间的链路，或者接入网设备重新选择一个中继终端设备并建立相应多路径中继，有助于实现为远端终端设备提供高质量的服务保障。
第六方面，本申请实施例提供一种通信方法，该方法可以由中继终端设备或应用于中继终端设备中的模块(如芯片)来执行。以中继终端设备执行该方法为例，该方法包括：中继终端设备确定该中继终端设备与接入网设备之间发生链路失败或连接失败，向远端终端设备发送失败指示信息，该失败指示信 息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
第七方面，本申请实施例提供一种通信方法，该方法可以由接入网设备或应用于接入网设备中的模块(如芯片)来执行。以接入网设备执行该方法为例，该方法包括：接入网设备确定中继终端设备是否需要为远端终端设备转发控制面信令；接入网设备向该中继终端设备发送通知信息，该通知信息用于确定该中继终端设备是否需要为该远端终端设备转发控制面信令。
该方案，当远端终端设备能够自己通过远端终端设备与接入网设备之间的接口接收接入网设备的控制面信令，则中继终端设备可以不需要监听并向中继终端设备转发该接入网设备发出的控制面信令，可以减少中继终端设备的信令开销。
一种可能的实现方法中，该接入网设备确定中继终端设备是否需要为该远端终端设备转发控制面信令，包括：当该远端终端设备能够通过该远端终端设备与该接入网设备之间的接口接收来自该接入网设备的控制面信令，则该接入网设备确定该中继终端设备不需要为该远端终端设备转发控制面信令；当该远端终端设备不能够通过该远端终端设备与该接入网设备之间的接口接收来自该接入网设备的控制面信令，则该接入网设备确定该中继终端设备需要为该远端终端设备转发控制面信令。
一种可能的实现方法中，接入网设备通过远端终端设备与接入网设备之间的接口，向远端终端设备发送配置消息，该配置消息包括中继终端设备的信息和状态信息，该配置消息用于RRC重配置，该状态信息指示该中继终端设备的RRC状态；该接入网设备通过远端终端设备与接入网设备之间的接口，接收来自该远端终端设备的响应于所述配置消息的配置完成消息；该接入网设备接收来自该中继终端设备的边链路用户信息，该边链路用户信息包括该中继终端设备的信息和该远端终端设备的信息。
第八方面，本申请实施例提供一种通信方法，该方法可以由中继终端设备或应用于中继终端设备中的模块(如芯片)来执行。以中继终端设备执行该方法为例，该方法包括：中继终端设备接收来自接入网设备的通知信息，该通知信息用于确定该中继终端设备是否需要为远端终端设备转发控制面信令；该中继终端设备根据该通知信息，确定需要为该远端终端设备转发控制面信令，或确定不需要为该中继终端设备转发控制面信令。
该方案，当远端终端设备能够自己通过远端终端设备与接入网设备之间的接口接收接入网设备的控制面信令，则中继终端设备可以不需要监听并向中继终端设备转发该接入网设备发出的控制面信令，可以减少中继终端设备的信令开销。
一种可能的实现方法中，该通知信息指示该中继终端设备提供的中继服务类型；该中继终端设备根据该通知信息，确定需要为该远端终端设备转发控制面信令，或确定不需要为该中继终端设备转发控制面信令，包括：该中继终端设备根据该中继终端设备提供的中继服务类型，确定需要为该远端终端设备转发控制面信令，或确定不需要为该中继终端设备转发控制面信令。
一种可能的实现方法中，中继终端设备接收来自远端终端设备的指示信息，该指示信息触发该中继终端设备进入RRC连接态；该中继终端设备向接入网设备发送边链路用户信息，该边链路用户信息包括该远端终端设备的信息和/或该中继终端设备的信息。
第九方面，本申请实施例提供一种通信装置，该装置可以是远端终端设备，还可以是用于远端终端设备的芯片或模块。该装置具有实现上述第一方面、第四方面或第五方面的任意实现方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十方面，本申请实施例提供一种通信装置，该装置可以是中继终端设备，还可以是用于中继终端设备的芯片。该装置具有实现上述第二方面、第六方面或第八方面的任意实现方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十一方面，本申请实施例提供一种通信装置，该装置可以是接入网设备，还可以是用于接入网设备的芯片。该装置具有实现上述第三方面或第七方面的任意实现方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第十二方面，本申请实施例提供一种通信装置，包括处理器和接口电路，所述处理器用于通过接口电路与其它装置通信，并执行上述第一方面至第六方面中的任意实现方法。该处理器包括一个或多个。
第十三方面，本申请实施例提供一种通信装置，包括与存储器耦合的处理器，该处理器用于调用所述存储器中存储的程序，以执行上述第一方面至第六方面中的任意实现方法。该存储器可以位于该装置 之内，也可以位于该装置之外。且该处理器可以是一个或多个。
第十四方面，本申请实施例提供一种通信装置，包括处理器和存储器；该存储器用于存储计算机指令，当该装置运行时，该处理器执行该存储器存储的计算机指令，以使该装置执行上述第一方面至第六方面中的任意实现方法。
第十五方面，本申请实施例提供一种通信装置，包括用于执行上述第一方面至第六方面中的任意实现方法的各个步骤的单元或手段(means)。
第十六方面，本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在通信装置上运行时，使得上述第一方面至第六方面中的任意实现方法被执行。
第十七方面，本申请实施例还提供一种计算机程序产品，该计算机程序产品包括计算机程序或指令，当计算机程序或指令被通信装置运行时，使得上述第一方面至第六方面中的任意实现方法被执行。
第十八方面，本申请实施例还提供一种芯片系统，包括：处理器，用于执行上述第一方面至第六方面的任意实现方法。
第十九方面，本申请实施例还提供一种通信系统，包括用于执行第一方面的任意实现方法的远端终端设备，和用于执行第二方面的任意实现方法的中继终端设备。
一种可能的实现方法中，该通信系统还包括用于执行第三方面的任意实现方法的接入网设备。
第二十方面，本申请实施例还提供一种通信系统，包括用于执行第七方面的任意实现方法的接入网设备，和用于执行第八方面的任意实现方法的中继终端设备。
附图说明
图1为本申请实施例应用的通信系统的架构示意图；
图2为SL U2NRelay的通信架构示意图；
图3为L2SL U2N Relay的协议栈示意图；
图4为multi-path Relay通信架构示意图；
图5为multi-path Relay的协议栈架构示意图；
图6(a)为本申请实施例提供的一种通信方法的流程示意图；
图6(b)为本申请实施例提供的一种通信方法的流程示意图；
图6(c)为本申请实施例提供的一种通信方法的流程示意图；
图6(d)为本申请实施例提供的一种通信方法的流程示意图；
图6(e)为本申请实施例提供的一种通信方法的流程示意图；
图6(f)为本申请实施例提供的一种通信方法的流程示意图；
图7为本申请实施例提供的一种通信方法的流程示意图；
图8(a)为远端UE与中继UE之间发生PC5 RLF的示意图；
图8(b)为远端UE与中继UE之间发生链路失败的示意图；
图8(c)为中继UE与基站之间发生Uu RLF的示意图；
图8(d)为中继UE与基站之间发生RRC建立失败的示意图；
图8(e)为中继UE与基站之间发生RRC建立失败的示意图；
图9为本申请实施例提供的一种通信方法的流程示意图；
图10为本申请的实施例提供的通信装置的示意图；
图11为本申请的实施例提供的通信装置的示意图；
图12提供了一种终端设备的结构示意图。
具体实施方式
图1为本申请实施例应用的通信系统的架构示意图。通信系统1000包括无线接入网100和核心网200，可选的，通信系统1000还可以包括互联网300。其中，无线接入网100包括至少一个接入网设备，如图1中的110a和110b，还包括至少一个终端设备，如图1中的120a-120j。其中，110a是基站，110b是微站，120a、120e、120f和120j是手机，120b是汽车，120c是加油机，120d是布置在室内或室外的家庭接入节点(home access point，HAP)，120g是笔记本电脑，120h是打印机，120i是无人机。其中，同一个终端设备或接入网设备，在不同应用场景中可以提供不同的功能。比如，图1中的手机有120a、 120e、120f和120j，手机120a可以接入基站110a，连接汽车120b，与手机120e直连通信以及接入到HAP，手机120b可以接入HAP以及与手机120a直连通信，手机120f可以接入为微站110b，连接笔记本电脑120g，连接打印机120h，手机120j可以控制无人机120i。
终端设备与接入网设备相连，接入网设备与核心网连接。核心网设备与接入网设备可以是独立的不同的物理设备，也可以是将核心网设备的功能与接入网设备的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的接入网设备的功能。终端设备和终端设备之间以及接入网设备和接入网设备之间可以通过有线或无线的方式相互连接。图1只是示意图，该通信系统中还可以包括其它网络设备，如还可以包括无线中继设备和无线回传设备，在图1中未画出。
接入网设备可以是基站(base station)、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、第五代(5th generation，5G)移动通信系统中的下一代基站(next generation NodeB，gNB)、第六代(6th generation，6G)移动通信系统中的基站、未来移动通信系统中的基站或无线保真(wireless fidelity，WiFi)系统中的接入节点等；也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)。接入网设备可以是宏基站(如图1中的110a)，也可以是微基站或室内站(如图1中的110b)，还可以是中继节点或施主节点等。本申请的实施例对接入网设备所采用的具体技术和具体设备形态不做限定。在本申请的实施例中，以基站作为接入网设备的一个举例进行描述。
终端设备也可以称为终端、用户设备(user equipment，UE)、移动台、移动终端等。终端设备可以广泛应用于各种场景，例如，设备到设备(device-to-device，D2D)、车物(vehicle to everything，V2X)通信、机器类通信(machine-type communication，MTC)、物联网(internet of things，IOT)、虚拟现实、增强现实、工业控制、自动驾驶、远程医疗、智能电网、智能家具、智能办公、智能穿戴、智能交通、智慧城市等。终端设备可以是手机、平板电脑、带无线收发功能的电脑、可穿戴设备、车辆、无人机、直升机、飞机、轮船、机器人、机械臂、智能家居设备等。本申请的实施例对终端设备所采用的具体技术和具体设备形态不做限定。
基站和UE可以是固定位置的，也可以是可移动的。基站和UE可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对基站和UE的应用场景不做限定。
基站和UE的角色可以是相对的，例如，图1中的直升机或无人机120i可以被配置成移动基站，对于那些通过120i接入到无线接入网100的120j来说，120i是基站；但对于基站110a来说，120i是UE，即110a与120i之间是通过无线空口协议进行通信的。当然，110a与120i之间也可以是通过基站与基站之间的接口协议进行通信的，此时，相对于110a来说，120i也是基站。因此，基站和UE都可以统一称为通信装置，图1中的110a和110b可以称为具有基站功能的通信装置，图1中的120a-120j可以称为具有UE功能的通信装置。
基站和UE之间、基站和基站之间、UE和UE之间可以通过授权频谱进行通信，也可以通过免授权频谱进行通信，也可以同时通过授权频谱和免授权频谱进行通信；可以通过6千兆赫兹(gigahertz，GHz)以下的频谱进行通信，也可以通过6GHz以上的频谱进行通信，还可以同时使用6GHz以下的频谱和6GHz以上的频谱进行通信。本申请的实施例对无线通信所使用的频谱资源不做限定。
为便于理解本申请实施例的方案，下面先对本申请实施例涉及的名词或术语进行说明。
一、边链路(sidelink)通信
在无线通信系统中，UE与UE之间可以通过网络进行数据通信，也可以不借助网络，直接进行UE与UE之间的通信。UE与UE之间的接口称为PC5接口，类似于UE与基站之间的Uu接口。UE与UE之间的链路称为sidelink。sidelink通信的一个典型应用场景是车联网(vehicle-to-everything，V2X)。在车联网中，每个车即为一个UE，UE与UE之间可以通过sidelink直接进行数据传输，而不需要经过网络，这样可以有效地减少通信时延。可以理解的是，边链路也可叫做侧链路，侧行链路，旁链路等。
二、sidelink上的广播、单播、组播
sidelink上的广播通信类似于基站广播系统信息，即UE不做加密对外发送广播业务数据，任何在有效接收范围内的其他UE，如果对该广播业务感兴趣都可以接收该广播业务的数据。
sidelink上的单播通信类似于UE与基站之间建立无线资源控制(radio resource control，RRC)连接之后进行的数据通信，需要两个UE之间在先建立单播连接。在建立单播连接之后，两个UE可以基于 协商的标识进行数据通信，该数据可以加密，也可以不加密。
sidelink上的组播通信是指一个通信组内所有UE之间的通信，组内任一UE都可以收发该组播业务的数据。
本申请实施例主要关注sidelink上的单播通信。sidelink上的一次单播通信对应于一对源层二标识(source layer-2 identifier，source L2 ID)和目的层二标识(destinationlayer-2 identifier，destination L2 ID)。每个sidelink媒体接入控制层数据协议单元(media access control protocol data unit，MAC PDU)的子头中一般会包含该源L2 ID和目的L2 ID，以使得数据能够从发送端传输至正确的接收端。
三、无线承载(RadioBearer，RB)
无线承载是基站为UE分配的一系列协议实体及配置的总称，包括分组数据汇聚协议(packet data convergence protocol，PDCP)实体、无线链路控制(radio link control，RLC)协议实体、媒体接入控制(medium access control，MAC)协议实体和物理层(PHY)分配的一系列资源等。无线承载分为数据无线承载(dataradio bearer，DRB)和信令无线承载(signalling radio bearer,SRB)，前者用于承载数据，后者用于承载信令消息。在sidelink通信场景中，UE和UE之间通信通过sidelink无线承载(sidelinkradio bearer，SLRB)，包括sidelinkDRB和sidelink SRB。在协议文本中，无线承载配置一般只包含PDCP层和业务数据适配协议(service data adaptation protocol，SDAP)层的配置，RLC层以下的协议实体称为RLC承载，且相应的配置在RLC承载配置中给出。
四、RLC承载(RLC bearer)
RLC承载指RLC层以下的协议实体及配置，为无线承载的下层部分，包括RLC协议实体和逻辑信道等一系列资源。一个RLC承载和一个逻辑信道相关联。通常地，一个RLC承载和一个PDCP实体相关联，即一个RLC服务于一个无线承载RB。
五、发现过程(discovery procedure)
一个支持邻近服务的UE通过发现过程，寻找附近的UE，并和其建立单播连接，进行后续的sidelink通信。UE的discovery协议层生成发现消息，递交给PDCP层，并通过底层发送给对端UE。
发现过程有模型A(Model A)和模型B(Model B)两种模型。模型A中，UE可以分为公告UE(Announcing UE)和监控UE(Monitoring UE)。Announcing UE广播发现消息(discovery message)，该发现消息又称为公告消息(announcement message)，公告消息中可以携带Announcing UE的特定信息，例如指示可提供业务类型的中继服务码(relay service code，RSC)，用于周边UE判断是否需要Announcing UE可提供的业务类型。邻近的Monitoring UE监测并接收到公告消息后，根据公告消息中携带的内容判断是否把Announcing UE作为sidelink通信的对端UE。模型B中，UE可以分为Discoverer UE和Discoveree UE。Discoverer UE广播发现消息，该发现消息又称为请求消息(solicitation message)，请求消息中携带了discoverer UE所感兴趣的业务类型的信息。discoveree UE监测并接收到请求消息后，若发现自己满足discoverer UE的业务需求，则会给discoverer UE回复另一条发现消息，该发现消息也称为响应消息(response message)。
与sidelink通信类似，发现消息中携带了源L2 ID和目的L2 ID，用于UE发送或接收发现消息。源L2 ID由发送UE自行分配，目的L2 ID为预定义或者预配置的default目的L2 ID。
六、单播连接建立
在发现过程之后，UE之间通过单播连接建立流程建立单播连接，发起单播连接建立流程的UE称为启动UE(initiating UE)，initiating UE的对端UE称为目标UE(target UE)。发现流程之后，initiating UE给target UE发送单播连接建立请求(direct communication request，DCR)消息，其中携带了initiating UE的L2 ID，target UE的L2 ID以及用户信息，该用户信息包括上层应用层相关的信息。target UE收到单播连接建立请求消息后，通过单播连接建立请求消息中的用户信息判断是否可以接受该单播连接建立请求。若可以接受该单播连接建立请求，则给initiating UE回复单播连接接受(direct communication accept，DCA)消息，否则，给initiation UE回复单播连接拒绝(direct communication reject，DCR)消息。
在上述模型A中，monitoring UE找到合适的对端UE之后，即可以主动发起单播连接建立过程。在上述模型B中，discoverer UE收到合适的discoveree UE的回复消息后，即可以发起单播建立流程。
七、边链路UE到网络中继(也称为sidelinkUE-to-Network Relay、SLUE-to-Network Relay或SL U2N Relay)
SL U2N Relay是一个UE帮助另一个UE和基站进行通信的技术，也叫中继技术。图2为SL U2NRelay的通信架构示意图。远端UE(Remote UE)通过中继UE(Relay UE)的协作，与基站进行通信，其中Remote UE和Relay UE之间通过sidelink通信，对应的接口称为PC5，Relay UE和基站直接连接，即通过Uu口进行通信。
本申请实施例可以用于SL U2N Relay的层2(L2)场景，以下简称为L2 SL U2N Relay。图3为L2SL U2NRelay的协议栈示意图。Remote UE的数据包在Relay UE的PDCP层以下进行中继转发，即Relay UE仅维护中继的RLC承载，包括RLC层、MAC层以及PHY层。因此，Remote UE和基站之间有端对端的PDCP层、SDAP层和RRC层，但没有端对端的RLC层、MAC层和PHY层。
该协议架构在RLC层和PDCP层之间增加了边链路中继适配协议(sidelink relay adaptation protocol，SRAP)层。SRAP层的主要作用是无线承载的复用和解复用，即支持不同的无线承载可以复用到一个RLC承载上以及对应的解复用过程。Remote UE和Relay UE之间的RLC承载称为PC5 Relay RLC channel/承载，Relay UE和基站之间的RLC承载称为Uu Relay RLC channel/承载。基站会给Remote UE和Relay UE进行SRAP配置，SRAP配置可包含Remote UE的SRB ID/DRB ID与Uu Relay RLC channel/PC5 Relay RLC channel之间的映射关系，从而使得Remote UE的数据可以正确的通过Relay UE进行中继转发。具体地，基站会给Remote UE配置无线承载(SRB或DRB)和PC5 Relay RLC channel之间的映射关系，给Relay UE配置Remote UE的无线承载与Uu/PC5 Relay RLC channel之间的映射关系。在数据传输过程中，以上行为例，Remote UE的SRAP层从PDCP层接收到PDCP PDU之后，会在SRAP头中添加Remote UE ID信息和无线承载(SRB或DRB)的ID信息，当Relay UE的适配层从PC5 Relay RLC channel接收到数据包之后，可以根据基站配置的映射关系，递交至正确的Uu Relay RLC channel，基站侧从Uu Relay RLC channel接收到数据包之后，将根据SRAP头中的Remote UE ID信息和无线承载ID信息，递交至对应的PDCP层进行处理。下行方向的数据传输过程和上行方向类似，在此不再赘述。其中，Remote UE ID信息可以为remote UE的Local ID，Local ID是基站为Remote UE分配的UE标识，Local ID用于Remote UE的上下行数据发送，通过在SRAR头中添加该标识，可以使得Relay UE和基站识别数据包所属的Remote UE。
八、多路径中继(也称为multi-path Relay)
本申请实施例中的“路径”指的是通信路径或通信链路。
作为SL U2N Relay的演进，第三代合作伙伴计划(3rd generation partnership project，3GPP)在研究多路径中继(multi-path Relay)方案。图4为multi-path Relay通信架构示意图。Remote UE同时通过一条直接(direct)链路和一条间接(indirect)链路与基站进行通信。其中，Remote UE与Relay UE位于同一个基站的小区覆盖范围内。direct链路上，Remote UE与基站直接通过Uu口进行通信。indirect链路上，Remote UE通过Relay UE与基站进行通信，其中Remote UE和Relay UE之间可以通过sidelink连接并通信，也可以通过非3GPP链路进行通信。Remote UE通过两条链路上的同时收发相同或者不同的数据，来提高数据收发的吞吐率和可靠性。
图5为multi-path Relay的协议栈架构示意图。图5的(a)为基于L2 SL U2N Relay的协议栈架构示意图，Remote UE和Relay UE之前通过sidelink连接，因此该架构是在L2 SL U2N Relay协议栈架构的基础上，增加了Remote UE与基站之间直接通信的协议栈。图5的(b)为Remote UE和Relay UE之间通过非3GPP连接时的协议栈架构，其中Remote UE和Relay UE，Relay UE和基站之间有适配层，但对于SRAP层，可以有SRAP层，也可以没有SRAP层，具体根据Remote UE承载复用的需求进行取舍。
图6(a)为本申请实施例提供的一种通信方法的流程示意图。该方法用于为远端UE配置远端UE与基站之间的多路径。在配置多路径之前，远端UE与基站之间存在直接路径，即远端UE能够通过远端UE与基站之间的Uu空口与基站通信，然后在此基础上再为远端UE配置中继UE，远端UE可以通过该中继UE与基站进行通信。
该方法包括以下步骤：
步骤601a，基站通过远端UE与基站之间的接口，向远端UE发送RRC重配置消息。相应地，远端UE通过该接口接收该RRC重配置消息。
需要说明的是，本申请实施例中，RRC重配置消息，也可以称为RRC配置消息，RRC消息，重配置消息或配置消息，本申请实施例对消息的名称不做限定，这里做统一说明。
该RRC重配置消息中包括中继UE的信息。示例性的，该中继UE的信息可以是中继UE的源L2 ID、 中继UE的源地址等。
可选的，该RRC重配置消息中还可以包括SRAP配置信息，远端UE与基站之间的端对端承载配置信息，或远端UE与中继UE之间的PC5中继RLC信道/承载配置信息中的至少一个。其中，SRAP配置信息包括远端UE的SRB ID/DRB ID与PC5中继RLC信道/承载之间的映射关系。
步骤602a，远端UE根据中继UE的信息，向中继UE发送指示信息，该指示信息触发中继UE进入RRC连接态。
一种实现方法中，远端UE不感知中继UE的RRC状态，当远端UE收到RRC重配置消息，远端UE就会向中继UE发送该指示信息。中继UE收到指示信息后，如果中继UE已经处于RRC连接态，则中继UE忽略该指示信息，如果中继UE处于RRC空闲态(RRC_IDLE)或RRC去激活态(RRC INACTIVE)，则中继UE从RRC空闲态或RRC去激活态进入RRC连接态。本申请实施例中的感知，可以理解为确定、判断或检查，这里做统一描述，后续不赘述。
又一种实现方法中，远端UE感知中继UE的RRC状态，例如在上述步骤601a的RRC重配置消息中包括状态信息，该状态信息指示中继UE的RRC状态。如果远端UE确定中继UE的RRC状态为RRC连接态，则中继UE不向中继UE发送上述指示信息，如果中继UE的RRC状态为RRC空闲态或RRC去激活态，则远端UE确定需要触发中继UE进入RRC连接态，则远端UE向中继UE发送上述指示信息。因此，如果中继UE收到指示信息，则中继UE根据指示信息，从RRC空闲态或RRC去激活态进入RRC连接态。
又一种实现方法中，远端UE感知中继UE的RRC状态，但无论中继UE的RRC状态是什么，远端UE收到RRC重配置消息后，都会向中继UE发送该指示信息。也即是该RRC重配置消息触发远端UE向中继UE发送该指示信息，该中继UE的RRC状态具体是什么，并不影响远端UE发送该指示信息。
步骤603a，处于RRC连接态的中继UE向基站发送边链路用户信息(sidelink UE information，SUI)。相应地，基站接收该SUI。
该SUI包括远端UE的信息和/或中继UE的信息。
该中继UE的信息可以是中继UE的源L2 ID或源地址等。
该远端UE的信息可以是远端UE的目的L2 ID或目标地址等。
需要说明的是，如果是该指示信息触发中继UE从RRC空闲态或RRC去激活态进入RRC连接态，则执行该步骤603a。如果中继UE在收到指示信息之前已经处于RRC连接态，则中继UE在先可能就已经向基站上报了中继UE的信息，因此该步骤603a可以执行，也可以跳过(即不执行该步骤603a)。
步骤604a，基站在收到来自中继UE的SUI之后，向中继UE发送RRC重配置消息。相应地，中继UE接收该RRC重配置消息。
该RRC重配置消息包括SRAP配置信息、中继UE与基站之间的Uu中继RLC信道/承载配置信息，或远端UE与中继UE之间的PC5中继RLC信道/承载配置信息中的至少一个。其中，该SRAP配置信包括远端UE的SRB ID/DRB ID与PC5中继RLC信道/承载之间的映射关系，以及远端UE的SRB ID/DRB ID与Uu中继RLC信道/承载之间的映射关系。
通过上述方案，可以实现为远端UE配置中继UE，并且在中继UE处于RRC空闲态或RRC去激活态的情况下，激活该中继UE，使得中继UE进入RRC连接态，从而保障成功地为远端UE配置远端UE与基站之间的多个路径，从而能够提升远端UE与基站之间通信的可靠性，提升了服务质量和用户体验。
一种实现方法中，在远端UE被配置多路径的场景中，例如该远端UE被配置多路径的流程中或完成多路径配置之后，基站可以向中继UE发送通知信息，该通知信息用于中继UE确定是否需要为远端UE转发控制面信令，中继UE根据该通知信息，确定需要为远端UE转发基站的控制面信令，或确定不需要为远端UE转发基站发出的控制面信令。其中，该控制面信令可以是系统消息或寻呼消息等。可以理解的是，该远端UE可以是采用如图6(a)所示方式被配置多路径，也可以是采用其他方式被配置多路径，本申请实施例对此不做限定，也就是说基站向中继UE发送通知信息的流程可以独立于图6(a)所示流程，也可以与图6(a)所示流程耦合。
其中，如果基站向中继UE发送通知信息的方案是与上述图6(a)的实施例相结合实施，则可以通知信息在上述步骤604a的RRC重配置消息中携带该通知信息，或者是通过其它单独的消息(如RRC信 令或MAC CE信令等)发送该通知信息。
一种具体的实现方法中，该通知信息可以指示中继UE提供的中继服务类型为3GPP R17中继服务或3GPPR18中继服务。其中，当通知信息指示中继UE提供的中继服务类型为3GPPR17中继服务，则该中继UE用于为远端UE提供SL U2N Relay，当通知信息指示中继UE提供的中继服务类型为3GPPR18中继服务，则该中继UE用于为远端UE提供multi-path Relay，也即提供多路径中继服务。
另一种具体的实现方法中，该通知信息指示中继UE需要为远端UE转发基站的控制面信令或不需要为远端UE转发基站的控制面信令。
比如，若通知信息指示中继服务类型为3GPPR17中继服务，或者指示中继UE需要为远端UE转发控制面信令，则基于该通知信息，中继UE可以确定远端UE只能通过间接链路与基站进行通信，或者远端UE和基站之间不能够直接进行控制面信令的收发，因此远端UE不能直接从基站接收控制面信令，从而中继UE将为远端UE转发控制面信令。例如，中继UE转发系统消息给远端UE。或者中继UE计算远端UE的寻呼时隙并在远端UE的寻呼时隙上监听远端UE的寻呼消息，如果中继UE监听到了基站需要发送给远端UE的寻呼消息，则中继UE根据寻呼消息中的远端UE的标识信息，将寻呼消息发送给远端UE。该方法可以提升远端UE的通信可靠性。
再比如，如果该通知信息指示中继UE提供的中继服务类型为3GPPR18中继服务，或指示不需要为远端UE转发控制面信令，基于该通知信息，中继UE确定远端UE既可以通过间接链路与基站进行通信，也可以通过直接链路与基站通信，因此远端UE可以直接从基站接收控制面信令。从而中继UE可以不需要为远端UE转发基站发送给远端UE的控制面信令，而是由远端UE自己直接从基站接收控制面信令。该方法可以减少中继UE的信令开销。
可选地，基站可以是在不需要中继UE提供控制面信令的中继转发时，向中继UE发送通知信息。因此，如果中继UE没有接收到基站发送的通知信息，则默认中继UE需要为远端UE提供控制面的中继转发服务。
可选地，基站可以是在需要中继UE提供控制面信令的中继转发时，向中继UE发送通知信息。因此，如果中继UE没有接收到基站发送的通知信息，则默认中继UE不需要为远端UE提供控制面的中继转发服务。
下面结合图6(a)的实施例，介绍上述指示信息的多种不同实现方法，以及在相应实现方法下对应流程。
方法1，指示信息是RRC重配置完成消息，或者说指示信息通过RRC重配置完成消息携带。
需要说明的是，本申请实施例中，RRC重配置完成消息用于响应RRC重配置消息，用于表明RRC重配置已经完成。RRC重配置完成消息，也可以称为RRC配置完成消息，RRC完成消息，重配置完成消息、配置完成消息、完成消息或响应消息等，本申请实施例对消息的名称不做限定，这里做统一说明。
图6(b)为本申请实施例提供的一种通信方法的流程示意图。该方法是在图6(a)的实施例的基础上进行扩展，该图6(b)的实施例是图6(a)的实施例的一种具体实现方案。图6(a)中的指示信息具体是图6(b)中的RRC重配置完成消息。
远端UE可以根据中继UE的RRC状态，确定发送RRC重配置完成消息的方式。其中，发送RRC重配置完成消息的方式可以是：远端UE通过远端UE与基站之间的接口向基站发送RRC重配置完成消息，或者是远端UE通过中继UE向基站发送RRC重配置完成消息，也即远端UE向中继UE发送RRC重配置完成消息，然后中继UE将RRC重配置完成消息转发给基站。
比如，如果远端UE感知中继UE的RRC状态为RRC空闲态或RRC去激活态，则远端UE确定需要触发中继UE进入RRC连接态，并通过RRC重配置完成消息触发中继UE进入RRC连接态，也即远端UE向中继UE发送RRC重配置完成消息，由中继UE将RRC重配置完成消息转发给基站，该RRC重配置完成消息能够触发中继UE进入RRC连接态。如果远端UE感知中继UE的RRC状态为RRC连接态，则远端UE可以通过远端UE和基站之间的直连链路回复RRC重配置完成消息，或者远端UE也可以将RRC重配置完成消息发给中继UE，然后中继UE将RRC重配置完成消息发给基站。
再比如，远端UE并不感知中继UE的RRC状态，直接向中继UE发送RRC重配置完成消息。中继UE收到RRC重配置完成消息后，如果中继UE当前处于RRC空闲态或者RRC非激活态，则中继UE需要进入RRC连接态。然后中继UE向基站转发该RRC重配置完成消息(即步骤b)。该步骤b与步骤603a的顺序不限。
可选的，在步骤602a之前，如果远端UE与中继UE之间没有建立单播连接，则远端UE先与中继UE建立单播连接(即步骤a)，例如，远端UE向中继UE发送单播连接建立请求消息，用于请求建立单播连接。
方法2，指示信息携带于请求消息中，该请求消息用于请求建立单播连接，该指示信息指示建立单播连接是为了获取中继UE的中继服务。该请求消息可以是单播连接建立请求消息或单播连接建立回复消息。
图6(c)为本申请实施例提供的一种通信方法的流程示意图。该方法是在图6(a)的实施例的基础上进行扩展，该图6(c)的实施例是图6(a)的实施例的一种具体实现方案。图6(a)中的指示信息通过图6(c)中的单播连接建立流程发送给中继UE，也即在用于请求建立单播连接的请求消息中携带指示信息，该指示信息指示建立单播连接是为了获取中继UE的中继服务。
具体的，远端UE与中继UE之间没有建立单播连接，因此在步骤601a之后，远端UE向中继UE发送上述请求消息，其中，该请求消息中携带指示信息(即步骤602a)。
一种实现方法中，如果远端UE感知中继UE的RRC状态为RRC空闲态或RRC去激活态，则远端UE确定需要触发中继UE进入RRC连接态，然后在上述请求消息中携带该指示信息，用于触发中继UE进入RRC连接态。中继UE收到该请求消息后，一方面建立与远端UE之间的单播连接，另一方面，中继UE根据指示信息，进入RRC连接态。
又一种实现方法中，中继UE并不感知中继UE的RRC状态，直接在上述请求消息中携带该指示信息。中继UE收到该请求消息后，一方面建立与远端UE之间的单播连接，另一方面，如果中继UE当前处于RRC空闲态或RRC去激活态，则中继UE还需要进入RRC连接态。
需要说明的是，上述请求消息中的指示信息，可以是一个显式的指示信息，比如是二进制指示信息或枚举型指示信息等，该指示信息显式地指示建立单播连接是为了获取中继UE的中继服务。或者，该指示信息也可以是一个隐式的指示信息，比如该指示信息是中继服务码或中继UE的用户信息，该中继服务码或中继UE的用户信息隐式地指示建立单播连接是为了获取中继UE的中继服务。
在上述的实现方法中，是通过请求消息中所携带的指示信息触发中继UE进入RRC连接态。
在另一种实现方法中，也可以通过请求消息所对应的指示信息触发中继UE进入RRC连接态，也即该指示信息没有携带在该请求消息中，比如该指示信息是该请求消息对应的特殊L2 ID，该特殊L2 ID对应的服务类型是中继服务类型，该特殊L2 ID是中继UE的特殊L2 ID或远端UE的用于建立多路径中继所使用的特殊L2 ID。若特殊L2 ID是中继UE的特殊L2 ID，则该特殊L2 ID为远端UE发送该请求消息所对应的目的L2 ID，此外，该特殊L2 ID还可以是中继UE发送发现消息所对应的源L2 ID；若特殊L2 ID是远端UE的特殊L2 ID，则该特殊L2 ID为远端UE发送该请求消息所对应的源L2 ID。当中继UE确定该请求消息对应的L2 ID是特殊L2 ID，则中继UE根据该特殊L2 ID确定需要为远端UE提供中继服务，并获知需要进入RRC连接态。当中继UE确定该请求消息对应的L2 ID是特殊L2 ID之外的普通L2 ID，该普通L2 ID对应的服务类型是设备到设备(device to device，D2D)服务类型，则中继UE根据该普通L2 ID确定需要为远端UE提供D2D通信服务。
在该图6(c)的实施例中，远端UE还可以通过远端UE与基站之间的接口向基站发送RRC重配置完成消息(即步骤c)，用以告知基站，远端UE重配置完成。其中，图6(c)中的步骤602a与步骤c之间的先后顺序不限。
或者，在图6(c)的实施例中，远端UE也可以通过中继UE转发RRC重配置完成消息。
针对该方法2，在具体实现中，既可以通过该请求消息中的指示信息指示建立单播连接是为了获取中继UE的中继服务，从而触发中继UE进入RRC连接态。
或者，也可以不在上述请求消息中携带上述指示信息，而是由该请求消息本身指示建立单播连接是为了获取中继UE的中继服务，此时该请求消息可以理解为就是一个指示信息，因此该请求消息一方面用于请求建立单播连接，另一方面会触发中继UE进入RRC连接态。
方法3，指示信息是PC5-S信令、PC5 RRC消息或边链路媒体接入控制控制单元(sidelink medium access control control element，SL MAC CE)信令。
图6(d)为本申请实施例提供的一种通信方法的流程示意图。该方法是在图6(a)的实施例的基础上进行扩展，该图6(d)的实施例是图6(a)的实施例的一种具体实现方案。图6(d)中的指示信息没有携带在单播连接建立请求消息或单播连接建立回复消息中，指示信息也不是RRC重配置完成消息，而是一个单 播的消息或信令。
在该图6(d)的实施例中，远端UE还需要通过远端UE与基站之间的接口向基站发送RRC重配置完成消息(即步骤e)，用以告知基站，远端UE重配置完成。其中，图6(d)中的步骤602a与步骤e之间的先后顺序不限。或者，在图6(d)的实施例中，远端UE也可以通过中继UE转发RRC重配置完成消息。
可选的，在图6(e)的实施例中，在步骤602a之前，如果远端UE与中继UE之间没有建立单播连接，则远端UE先与中继UE建立单播连接(即步骤d)，具体的，远端UE向中继UE发送单播连接建立请求消息或单播连接建立回复消息，用于请求建立单播连接。
以上给出了远端UE触发中继UE进入RRC连接态的多种不同实现方法，当然实际应用中不限于以上方法，也可以使用其它方法。
图6(e)为本申请实施例提供的一种通信方法的流程示意图。该方法中，在步骤601a之后，远端UE确定中继UE的RRC状态(即步骤f)，例如通过步骤601a的RRC重配置消息携带用于指示中继UE的RRC状态的指示信息，或者远端UE通过接收中继UE的发现消息，该发现消息中携带中继UE的RRC状态。在情形1中，中继UE的RRC状态为RRC连接态，因此基站已经能够获知中继UE的信息，不需要中继UE向基站上报边链路用户信息，从而只需要执行步骤g和步骤h，即远端UE通过远端UE与基站之间的接口向基站发送RRC重配置完成消息，以及基站向中继UE发送RRC重配置消息，该RRC重配置消息中携带的内容可以参考前述步骤604a的描述。可选的，在情形1中，如果中继UE与远端UE之间没有建立单播连接，则远端UE还需要建立与中继UE之间的单播连接。在情形2中，中继UE的RRC状态为RRC空闲态或RRC去激活态，则需要执行步骤602a、步骤603a和步骤604a，具体参考图6(a)的实施例。也即该情形2即为上述图6(a)的实施例的一种具体实现，并且该情形2中的指示信息的多种不同实现方法可以参考图6(b)、图6(c)和图6(d)的实施例，不再赘述。
需要说明的是，该图6(b)、图6(c)、图6(d)及图6(e)中的步骤601a、步骤602a、步骤603a及步骤604a可以参考图6(a)的实施例中的相应描述。
一种实现方法中，如果在为远端UE配置多路径的过程中发生远端UE与中继UE之间的链路失败或连接失败，或者发生远端UE与基站之间的链路失败或连接失败，或者发生基站与中继UE之间的链路失败或连接失败，则远端UE需要上报至基站。下面介绍发生链路失败或连接失败的不同类型以及相应的上报方式。
一种实现方法中，远端UE确定远端UE与中继UE之间发生链路失败或连接失败，则向基站发送第一失败指示信息，第一失败指示信息指示远端UE与中继UE之间发生链路失败或连接失败。其中，该链路失败可以是PC5 RLF，该连接失败可以是蓝牙连接失败或WiFi连接失败等。RLF指的是无线链路失败(radio link failure)。
又一种实现方法中，远端UE确定远端UE与基站之间发生链路失败或连接失败，则通过中继UE向基站发送第二失败指示信息，该第二失败指示信息指示远端UE与基站之间发生链路失败或连接失败。其中，该链路失败可以是Uu RLF，该连接失败可以是非3GPP连接失败等。
又一种实现方法中，中继UE确定中继UE与基站之间发生链路失败或连接失败，则向远端UE发送第三失败指示信息，该第三失败指示信息指示中继UE与基站之间发生链路失败或连接失败，然后远端UE向基站发送第四失败指示信息，该第四失败指示信息指示中继UE与基站之间发生链路失败或连接失败。其中，该链路失败可以是Uu RLF，该连接失败可以是非3GPP连接失败等。
其中，如果是远端UE与中继UE之间发生链路失败或连接失败，或者中继UE与基站之间发生链路失败或连接失败，则可以由远端UE或基站重新选择中继UE，然后使用该新选择的中继UE，为远端UE重新配置多路径。如果是远端UE与基站之间发生链路失败或连接失败，则远端UE可以执行RRC重建立流程，并在该流程中完成远端UE的多路径配置。
需要说明的是，以上介绍的链路失败或连接失败之后的上报方案，可以与上述图6(a)、图6(b)、图6(c)、图6(d)或图6(e)的实施例相结合实施，或者也可以单独实施，本申请对此不限定。
图6(f)为本申请实施例提供的另一种通信方法的流程示意图。该方法是在远端UE的RRC重建立流程中完成远端UE的多路径配置。该方法包括以下步骤：
步骤601f，远端UE选择中继UE。
一种实现方法中，远端UE从远端UE所在的小区中选择一个UE作为中继UE。其中，该中继UE 可以是该小区中参考信号接收功率最大的一个UE，或者是该小区中的任意一个UE。其中，远端UE可以前面描述的发现流程，获取小区中的UE的参考信号接收功率。
步骤602f，远端UE向基站发送RRC重建立请求消息。相应地，基站接收该RRC重建立请求消息。
步骤603f，远端UE建立与中继UE之间的单播连接。
该步骤603f为可选步骤。当远端UE已经与中继UE建立了单播连接，则该步骤603f不需要执行。当远端UE与中继UE没有建立单播连接，则该步骤603f需要执行。
其中，上述步骤602f与步骤603f的顺序不限。
步骤604f，中继UE向基站发送SUI。相应地，基站接收该SUI。
该SUI中包括远端UE的信息，或者包括中继UE的信息和远端UE的信息。
步骤605f，基站向远端UE发送RRC重建立消息。相应地，远端UE接收该RRC重建立消息。
步骤606f，远端UE向基站发送RRC重建立完成消息。相应地，基站接收该RRC重建立完成消息。
该RRC重建立完成消息中包括中继UE的信息，或者包括中继UE的信息和远端UE的信息。
其中，中继UE的信息可以包括中继UE的目的L2 ID，远端UE的信息可以包括远端UE的源L2 ID。
基站根据该RRC重建立完成消息中的内容，以及上述步骤604f的SUI中的内容，获知该远端UE选择该中继UE用于为远端UE建立多路径连接。也即基站根据中继UE上报的SUI中的内容和远端UE上报的RRC重建立完成消息中的内容，获知中继UE和远端UE均支持由该中继UE为该远端UE建立多路径连接。比如，上述步骤604f的SUI中包括中继UE的信息和远端UE的信息，上述步骤606f的RRC重建立完成消息中包括中继UE的信息和远端UE的信息。再比如，上述步骤604f的SUI中包括中继UE的信息和远端UE的信息，上述步骤606f的RRC重建立完成消息中包括中继UE的信息。再比如，上述步骤604f的SUI中包括远端UE的信息，上述步骤606f的RRC重建立完成消息中包括中继UE的信息和远端UE的信息。再比如，上述步骤604f的SUI中包括远端UE的信息，上述步骤606f的RRC重建立完成消息中包括中继UE的信息。
后续基站还需要分别向远端UE和中继UE发送RRC重配置消息，以完成对中继UE和远端UE的RRC配置。关于该RRC重配置消息中的内容可以参考图6(a)的实施例的描述。
上述方案，在远端UE的重建立流程完成后，基站可以基于远端UE选择的中继UE的信息，为远端UE配置多路径，有助于实现远端UE的多路径的快速配置。
下面结合具体示例，对上述各个实施例进行说明。其中，图7的实施例是上述图6(a)或图6(e)的实施例的一个具体示例，图9的实施例是上述图6(f)的实施例的一个具体示例。
图7为本申请实施例提供的一种通信方法的流程示意图。该方法包括以下步骤：
步骤701，远端UE通过发现过程寻找周边可用的UE。
远端UE可以通过上述模型A或模型B的方法，寻找周边可用的UE。可用的UE指的是能够为远端UE提供中继服务的UE。
步骤702a，基站向远端UE发送测量配置信息。
步骤702b，远端UE根据测量配置信息进行测量得到测量结果，并向基站发送测量结果。
该测量结果包括一个或多个UE的源L2 ID、该一个或多个UE的RSRP以及该一个或多个UE的服务小区的标识。
需要说明的是，上述步骤701也可以是在步骤702a之后执行，因此远端UE可以同时对远端UE周边的UE进行发现和测量，例如远端UE通过接收来自周边UE的发现消息，对该发现消息进行测量得到该UE的信号质量。
步骤703，基站根据测量结果确定为远端UE配置多路径，并为远端UE选择用于建立间接链路的中继UE。
基站选择中继UE的实现方法，可以参考前述图6(a)的实施例的描述。
步骤704，基站向远端UE发送RRC重配置消息。
该RRC重配置消息中的内容，可以参考前述步骤601a的描述。
步骤705，远端UE建立与中继UE之间的单播连接。
在步骤705之后，执行以下步骤706a至步骤708a以及步骤709，或者执行以下步骤706b至步骤708b以及步骤709。即步骤706a至步骤708a，与步骤706b至步骤708b为二选一执行。其中，以下步骤706a至步骤708a称为方法一，以下步骤706b至步骤708b称为方法二。
一种实现方法中，通过预定义或者预先为远端UE配置的方式，使得远端UE和中继UE按照该方法一执行，或按照该方法二执行。另一种实现方法中，也可以由远端UE自行决策选择方法一或方法二执行。
此外，需要说明的是，针对该方法一，如果远端UE能够获知中继UE的RRC状态为RRC连接态，则远端UE可以通过远端UE与基站之间的接口向基站发送RRC重配置完成消息，并且不需要触发中继UE进入RRC连接态。也即只需要执行步骤706a，但不需要执行步骤707a和步骤708a。
步骤706a，远端UE通过Uu链路向基站发送RRC重配置完成消息。
该RRC重配置完成消息指示远端UE成功接收到多路径配置信息。多路径配置信息即为上述RRC重配置消息中包含的信息。
步骤707a，远端UE向中继UE发送指示信息，该指示信息触发中继UE进入RRC连接态。
关于通过指示信息触发中继UE进入RRC连接态的实现方法，可以参考前述图6(a)至图6(e)的实施例的描述。
步骤708a，中继UE触发进入RRC连接态，并向基站发送边链路用户信息(Sidelink UE information，SUI)。
该SUI包含中继UE的源L2 ID，远端UE的目的L2 ID或指示信息中的一个或多个，该指示信息用于请求基站为该远端UE分配本地标识(Local ID)。
步骤706b，远端UE向中继UE发送RRC重配置完成消息。
关于该RRC重配置完成消息的实现方法，可以参考前述图6(a)至图6(e)的实施例的描述。
步骤707b，中继UE触发进入RRC连接态，并向基站发送SUI。
该SUI包含中继UE的源L2 ID，远端UE的目的L2 ID和指示信息，该指示信息用于请求基站为该远端UE分配本地标识(Local ID)。
步骤708b，中继UE向基站转发来自远端UE的RRC重配置完成消息。
上述方法中，基站为远端UE配置多路径时可以定义上述方法一(涉及步骤706a至步骤708a)来触发中继UE进入RRC连接态，此时，远端UE与基站之间的Uu链路上配置有SRB承载。另一种可能的实现方式中，不约束基站配置SRB的情况，因此可能存在如下三种情形：
情形1，基站仅在直接链路配置SRB，则远端UE通过上述方法一(涉及步骤706a至步骤708a)回复RRC重配置完成消息以及触发中继UE进入RRC连接态。
情形2，基站配置SRB分离(split)/重复(duplication)，即同一个SRB消息可以同时在直接链路和间接链路传输，则远端UE可以通过上述方法一(涉及步骤706a至步骤708a)和/或方法二(涉及上述步骤706b至步骤708b)回复RRC重配置完成消息。具体选择哪种方式可以留给UE实现。
如果远端UE在直接链路和间接链路上都回复RRC重配置完成消息，则可以不需要通过上述步骤707a来触发中继UE进入RRC连接态，而是通过RRC重配置完成消息触发中继UE进入RRC连接态。
情形3，基站仅在间接链路上配置SRB，则远端UE通过上述方法二(涉及步骤706b至步骤708b)回复RRC重配置完成消息以及触发中继UE进入RRC连接态。
关于该三种情形的描述，同样适用于前述图6(a)至图6(e)的实施例，不再赘述。
步骤709，基站向中继UE发送RRC重配置消息。
关于该RRC重配置消息的实现，可以参考图6(a)中的步骤604a的描述。
上述方案，当基站为远端UE选择的中继UE处于RRC空闲态或RRC去激活态，则远端UE可以通过远端UE与基站之间的Uu链路向基站回复RRC重配置完成消息，以及远端UE还触发中继UE进入RRC连接态，从而保证为远端UE成功配置多路径，有助于提升远端UE的通信质量。
一种实现方法中，在基站为远端UE配置多路径的流程中或完成多路径配置之后，基站可以向中继UE发送通知信息，该通知信息用于确定中继UE是否需要为远端UE转发控制面信令。中继UE可以根据该通知信息确定是否需要为远端UE转发控制面信令。关于该通知信息的详细描述可以参考图6(a)的实施例中的相关描述，不再赘述。
一种实现方法中，如果基站向中继UE发送通知信息的方案，与上述图7的实施例相结合，则可以在步骤709的RRC重配置消息包括该通知信息，或者是通过基站与中继UE之间的一个其它消息发送该通知信息。
在上述为远端UE配置多路径的过程中，可能会发生链路失败或连接失败。当发生链路失败或连接 失败，需要做相应处理，以保证为远端UE成功配置多路径。下面分不同情形说明。
示例1，在远端UE与中继UE建立单播连接过程中或建立单播连接完成后，远端UE检测到远端UE与中继UE之间发生PC5 RLF。
图8(a)为远端UE与中继UE之间发生PC5 RLF的示意图。远端UE与中继UE之间发生PC5 RLF，导致远端UE不能使用中继UE的中继服务。该情形下，远端UE在检测到远端UE与中继UE之间发生PC5 RLF时，如果远端UE与基站之间的直接链路上配置有SRB承载，则远端UE可以通过该SRB承载向基站发送指示信息，该指示信息指示远端UE与中继UE之间发生PC5 RLF，从而触发为远端UE重新选择中继UE并进行多路径配置，具体流程可以参考前述图7的实施例，或者也可以按照其它方法为远端UE进行多路径配置。如果远端UE与基站之间的直接链路上没有配置SRB承载，则远端UE无法向基站告知远端UE与中继UE之间发生PC5 RLF，因此远端UE可以触发重建立流程，并在重建立流程中为远端UE进行多路径配置。其中，关于重建立流程的描述可以参考图9的实施例。
示例2，在远端UE通过直接链路向基站回复RRC重配置完成消息时，远端UE与中继UE之间因链路质量不好，导致远端UE无法向基站回复RRC重配置完成消息，也即远端UE与基站之间发生链路失败。
图8(b)为远端UE与中继UE之间发生链路失败的示意图。该情形下，远端UE在检测到远端UE与中继UE之间发生链路失败时，如果远端UE与基站之间的间接链路上配置有SRB承载，则远端UE可以通过该SRB承载向基站发送指示信息，该指示信息指示远端UE与中继UE之间发生链路失败，从而触发基站重新与远端UE之间建立连接。如果远端UE与基站之间的间接链路上没有配置SRB承载，则远端UE无法通过间接链路向基站告知远端UE与中继UE之间发生链路失败，因此远端UE可以触发重建立流程，并在重建立流程中为远端UE进行多路径配置。其中，关于重建立流程的描述可以参考图9的实施例。
示例3，中继UE与基站之间发生Uu RLF。
图8(c)为中继UE与基站之间发生Uu RLF的示意图。中继UE在已经与基站之间建立无线连接之后又发生Uu RLF，导致远端UE不能使用中继UE的中继服务。该情形下，中继UE在检测到中继UE与基站之间的Uu RLF时，向远端UE发送指示信息，该指示信息指示中继UE与基站之间发生Uu RLF，远端UE在收到该指示信息后，如果远端UE与基站之间的直接链路上配置有SRB承载，则远端UE可以通过该SRB承载向基站发送指示信息，该指示信息指示中继UE与基站之间发生Uu RLF，从而触发为远端UE重新选择中继UE并进行多路径配置，具体流程可以参考前述图7的实施例，或者也可以按照其它方法为远端UE进行多路径配置。如果远端UE与基站之间的直接链路上没有配置SRB承载，则远端UE无法向基站告知中继UE与基站之间发生Uu RLF，因此远端UE可以触发重建立流程，并在重建立流程中为远端UE进行多路径配置。其中，关于重建立流程的描述可以参考图9的实施例。
可选的，远端UE在收到来自中继UE的用于指示中继UE与基站之间发生Uu RLF的指示信息之后，可以释放与中继UE之间的单播连接。
示例4，中继UE与基站之间发生RRC建立失败(setup failure)。
图8(d)和图8(e)为中继UE与基站之间发生RRC建立失败的示意图。中继UE在与基站之间建立无线连接的过程中发生RRC建立失败，导致远端UE不能使用中继UE的中继服务。该情形下，中继UE在检测到中继UE与基站之间的RRC建立失败时，向远端UE发送指示信息，该指示信息指示中继UE与基站之间发生RRC建立失败，该指示信息可以是PC5 RRC消息，远端UE在收到该指示信息后，如果远端UE与基站之间的直接链路上配置有SRB承载，则远端UE可以通过该SRB承载向基站发送指示信息，该指示信息指示中继UE与基站之间发生RRC建立失败，从而触发为远端UE重新选择中继UE并进行多路径配置，具体流程可以参考前述图7的实施例，或者也可以按照其它方法为远端UE进行多路径配置。如果远端UE与基站之间的直接链路上没有配置SRB承载，则远端UE无法向基站告知中继UE与基站之间发生RRC建立失败，因此远端UE可以触发重建立流程，并在重建立流程中为远端UE进行多路径配置。其中，关于重建立流程的描述可以参考图9的实施例。
可选的，远端UE在收到来自中继UE的用于指示中继UE与基站之间发生RRC建立失败的指示信息之后，可以释放与中继UE之间的单播连接。
图9为本申请实施例提供的一种通信方法的流程示意图。该方法为远端UE的重建立流程，且在该流程中为远端UE配置多路径。该方法包括以下步骤：
步骤901，远端UE选择合适的小区以及在该小区下的中继UE。
关于远端UE选择中继UE的方法，可以参考图6(f)的步骤601f的描述。
步骤902，远端UE通过Uu口向基站发送RRC重建立请求消息。
该基站指的是远端UE选择的合适的小区所在的基站，该基站与远端UE在发送RRC重建立请求消息之前接入的基站可以相同，也可以不同。
当该基站(以下称为基站1)与远端UE在发送RRC重建立请求消息之前接入的基站(以下称为基站2)不同，则该基站1可以向基站2获取该远端UE的上下文信息。
步骤903，当远端UE与选择的中继UE之间无单播连接，则远端UE建立与中继UE之间的单播连接。
步骤904，中继UE向基站发送SUI。
关于SUI的内容，可以参考图6(f)的步骤604f的描述。
步骤905，基站向远端UE发送RRC重建立消息。
关于RRC重建立消息的内容，可以参考图6(f)的步骤605f的描述。
步骤906a，基站向中继UE发送RRC重配置消息。
关于RRC重配置消息的内容，可以参考图6(f)实施例的描述。
步骤906b，中继UE向基站发送RRC重配置完成消息。
步骤907，远端UE向基站发送RRC重建立完成消息。
关于RRC重配置消息的内容，可以参考图6(f)中的步骤606f的描述。
步骤908，基站向远端UE发送RRC重配置消息。
关于RRC重配置消息的内容，可以参考图6(f)实施例的描述。
步骤909，远端UE向基站发送RRC重配置完成消息。
上述方案，在远端UE的重建立流程中，同时为远端UE完成重建立和配置多路径，有助于实现远端UE的多路径的快速配置。
上述图9的实施例中，远端UE选择的中继UE与远端UE是在同一个小区，在实际应用中，也可以选择与远端UE不在同一个小区的中继UE，本申请对此不限定。
上述图9的实施例中，是由远端UE选择中继UE，实际应用中也可以是由远端UE将测量得到的多个UE的信息通过RRC重建立完成消息上报给基站，并由基站从该多个UE中选择一个UE作为中继UE。基站在完成远端UE的重建立流程之后，再根据选择的中继UE为远端UE配置多路径。
可以理解的是，为了实现上述实施例中功能，远端终端设备、中继终端设备或接入网设备包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本申请中所公开的实施例描述的各示例的单元及方法步骤，本申请能够以硬件或硬件和计算机软件相结合的形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用场景和设计约束条件。
图10和图11为本申请的实施例提供的可能的通信装置的结构示意图。这些通信装置可以用于实现上述图6(a)、图6(b)、图6(c)、图6(d)、图6(e)、图6(f)，以及图7和图9的方法实施例中远端终端设备、中继终端设备或接入网设备的功能，因此也能实现上述方法实施例所具备的有益效果。在本申请的实施例中，该通信装置可以是远端终端设备、中继终端设备或接入网设备，也可以是应用于远端终端设备、中继终端设备或接入网设备的模块(如芯片)。
图10所示的通信装置1000包括处理单元1010和收发单元1020。通信装置1000用于实现上述方法实施例中远端终端设备、中继终端设备或接入网设备的功能。
当该通信装置用于执行上述方法实施例中的远端终端设备的功能，收发单元1020，用于通过该远端终端设备与接入网设备之间的接口，接收来自该接入网设备的配置消息，该配置消息包括中继终端设备的信息，该配置消息用于RRC重配置；该远端终端设备根据该中继终端设备的信息，向该中继终端设备发送指示信息，该指示信息触发该中继终端设备进入RRC连接态。
一种可能的实现方法中，处理单元1010，用于根据该中继终端设备的RRC状态，确定需要触发该中继终端设备进入RRC连接态。
一种可能的实现方法中，该配置消息还包括状态信息，该状态信息指示该中继终端设备的RRC状态；远端终端设备根据状态信息，确定中继终端设备的RRC状态。
一种可能的实现方法中，该指示信息是该配置完成消息。
一种可能的实现方法中，收发单元1020，用于通过该远端终端设备与该接入网设备之间的接口，向该接入网设备发送该配置完成消息。
一种可能的实现方法中，收发单元1020，用于向该中继终端设备发送请求消息，该请求消息用于请求建立单播连接，该请求消息包括该指示信息，该指示信息指示建立单播连接是为了获取该中继终端设备的中继服务。
一种可能的实现方法中，该指示信息是PC5-S信令、PC5 RRC消息或SL MAC CE信令。
一种可能的实现方法中，处理单元1010，用于确定该远端终端设备与该中继终端设备之间发生链路失败或连接失败；收发单元1020，用于向该接入网设备发送第一失败指示信息，该第一失败指示信息指示该远端终端设备与该中继终端设备之间发生链路失败或连接失败。
一种可能的实现方法中，处理单元1010，用于确定该远端终端设备与该接入网设备之间发生链路失败或连接失败；收发单元1020，用于通过该中继终端设备向该接入网设备发送第二失败指示信息，该第二失败指示信息指示该远端终端设备与该接入网设备之间发生链路失败或连接失败。
一种可能的实现方法中，收发单元1020，用于接收来自该中继终端设备的第三失败指示信息，该第三失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败；向该接入网设备发送第四失败指示信息，该第四失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
一种可能的实现方法中，收发单元1020，还用于通过该远端终端设备与接入网设备之间的接口，向该接入网设备发送至少一个候选终端设备的信息，该至少一个候选终端设备包括该中继终端设备，该至少一个候选终端设备的信息包括该候选终端设备的信号质量和/或用于指示该候选终端设备是否支持多路径中继的信息。
一种可能的实现方法中，收发单元1020，还用于接收来自候选终端设备的发现消息，该发现消息中包括用于指示候选终端设备是否支持多路径中继的信息。
一种可能的实现方法中，收发单元1020，还用于接收来自该候选终端设备的发现消息，该发现消息对应的该候选终端设备的标识信息用于指示该候选终端设备是否支持多路径中继。
当该通信装置用于执行上述方法实施例中的中继终端设备的功能，收发单元1020，用于接收来自远端终端设备的指示信息，该指示信息触发该接入网设备进入RRC连接态；向接入网设备发送边链路用户信息，该边链路用户信息包括该远端终端设备的信息和/或该中继终端设备的信息。
一种可能的实现方法中，处理单元1010，用于根据该指示信息，进入RRC连接态。
一种可能的实现方法中，该指示信息是PC5-S信令、PC5 RRC消息、SL MAC CE信令或来自所述中继终端设备的配置完成消息。
一种可能的实现方法中，收发单元1020，用于接收来自该远端终端设备的请求消息，该请求消息用于请求建立单播连接，该请求消息包括该指示信息，该指示信息指示建立单播连接是为了获取该中继终端设备的中继服务。
一种可能的实现方法中，收发单元1020，用于接收来自该接入网设备的通知信息，该通知信息用于中继终端设备确定是否需要为远端终端设备转发控制面信令；处理单元1010，用于根据该通知信息，确定需要为远端终端设备转发控制面信令，或确定不需要为远端终端设备转发控制面信令。
一种可能的实现方法中，处理单元1010，用于确定该中继终端设备与该接入网设备之间发生链路失败或连接失败；收发单元1020，用于向该远端终端设备发送失败指示信息，该失败指示信息指示该中继终端设备与该接入网设备之间发生链路失败或连接失败。
一种可能的实现方法中，收发单元1020，还用于向该远端终端设备发送发现消息，该发现消息中包括用于指示该中继终端设备支持多路径中继的信息。
一种可能的实现方法中，收发单元1020，还用于向该远端终端设备发送发现消息，该发现消息对应的该中继终端设备的标识信息用于指示该中继终端设备支持多路径中继。
当该通信装置用于执行上述方法实施例中的接入网设备的功能，收发单元1020，用于通过远端终端设备与接入网设备之间的接口，向远端终端设备发送配置消息，该配置消息包括中继终端设备的信息和状态信息，该状态信息指示该中继终端设备的RRC状态，该配置消息用于RRC重配置；接收来自该中继终端设备的边链路用户信息，该边链路用户信息包括该中继终端设备的信息和该中继终端设备的信 息。
一种可能的实现方法中，收发单元1020，用于通过远端终端设备与接入网设备之间的接口，接收来自远端终端设备的响应于配置消息的配置完成消息。
一种可能的实现方法中，收发单元1020，用于通过中继终端设备，接收来自远端终端设备的响应于配置消息的配置完成消息。
一种可能的实现方法中，收发单元1020，用于向该中继终端设备发送通知信息，该通知信息用于中继终端设备确定是否需要为远端终端设备转发控制面信令，该第二配置消息用于RRC重配置。
当该通信装置用于执行上述方法实施例中的远端终端设备的功能，处理单元1010，用于选择中继终端设备；收发单元1020，用于向接入网设备发送RRC重建立请求消息；接收来自该接入网设备的RRC重建立消息；向该接入网设备发送RRC重建立完成消息，该RRC重建立完成消息包括该中继终端设备的信息和/或该远端终端设备的信息。
一种可能的实现方法中，处理单元1010，用于在收发单元1020向该接入网设备发送RRC重建立完成消息之前，建立该中继终端设备之间的单播连接。
有关上述处理单元1010和收发单元1020更详细的描述可以直接参考上述方法实施例中相关描述直接得到，这里不加赘述。
图11所示的通信装置1100包括处理器1110和接口电路1120。处理器1110和接口电路1120之间相互耦合。可以理解的是，接口电路1120可以为收发器或输入输出接口。可选的，通信装置1100还可以包括存储器1130，用于存储处理器1110执行的指令或存储处理器1110运行指令所需要的输入数据或存储处理器1110运行指令后产生的数据。
该通信装置1100可以是上述方法实施例中远端终端设备、中继终端设备或接入网设备，也可以是应用于远端终端设备、中继终端设备或接入网设备的模块(如芯片)。
当通信装置1100用于实现上述方法实施例时，处理器1110用于实现上述处理单元1010的功能，接口电路1120用于实现上述收发单元1020的功能。
可以理解的是，本申请的实施例中的处理器可以是中央处理单元(central processing unit，CPU)，还可以是其它通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。通用处理器可以是微处理器，也可以是任何常规的处理器。
图12提供了一种终端设备的结构示意图。该终端设备可适用于上述任意方法实施例中由远端终端设备或中继终端设备执行的操作。为了便于说明，图12仅示出了终端设备的主要部件。图12所示的终端设备1200包括处理器、存储器、控制电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端设备进行控制，执行软件程序，处理软件程序的数据。存储器主要用于存储软件程序和数据。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端设备开机后，处理器可以读取存储器中的软件程序，解析并执行软件程序的指令，处理软件程序的数据。当需要通过无线方式发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至控制电路，控制电路将基带信号进行处理后得到射频信号并将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端设备时，控制电路通过天线接收到射频信号，该射频信号被进一步转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
为了便于说明，图12仅示出了一个存储器和处理器。在实际的终端设备中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端设备进行控制，执行软件程序，处理软件程序的数据。图12中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端设备可以包括多个基带处理器以适应不同的网络制式，终端设备可以包括多个中央处理器以增强其处理能力，终端设备的各个部件可以通过各种总线连接。基带处理器也可以表述为基带处理电路或者基 带处理芯片。中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储器中，由处理器执行软件程序以实现基带处理功能。
在一个例子中，可以将具有收发功能的天线和控制电路视为终端设备1200的收发单元1211，将具有处理功能的处理器视为终端设备1200的处理单元1212。如图12所示，终端设备1200包括收发单元1211和处理单元1212。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元1211中用于实现接收功能的器件视为接收单元，将收发单元1211中用于实现发送功能的器件视为发送单元，即收发单元1211包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。可选的，上述接收单元和发送单元可以是集成在一起的一个单元，也可以是各自独立的多个单元。上述接收单元和发送单元可以在一个地理位置，也可以分散在多个地理位置。
本申请实施例还提供一种通信装置，包括与存储器耦合的处理器，该处理器用于调用所述存储器中存储的程序，以执行上述方法实施例中由远端终端设备、中继终端设备或接入网设备执行的操作。该存储器可以位于该装置之内，也可以位于该装置之外。且该处理器可以是一个或多个。
本申请实施例提供一种通信装置，包括处理器和存储器；该存储器用于存储计算机指令，当该装置运行时，该处理器执行该存储器存储的计算机指令，以执行上述方法实施例中由远端终端设备、中继终端设备或接入网设备执行的操作。
本申请实施例还提供一种芯片系统，包括：处理器，用于以执行上述方法实施例中由远端终端设备、中继终端设备或接入网设备执行的操作。
本申请实施例还提供一种通信系统，包括上述方法实施例中的远端终端设备和中继终端设备。可选的，该通信系统还包括该方法实施例中的接入网设备。
本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在通信装置上运行时，以执行上述方法实施例中由远端终端设备、中继终端设备或接入网设备执行的操作。
本申请实施例还提供一种计算机程序产品，该计算机程序产品包括计算机程序或指令，当计算机程序或指令被通信装置运行时，以执行上述方法实施例中由远端终端设备、中继终端设备或接入网设备执行的操作。
本申请的实施例中的方法步骤可以通过硬件的方式来实现，也可以由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于随机存取存储器、闪存、只读存储器、可编程只读存储器、可擦除可编程只读存储器、电可擦除可编程只读存储器、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外，该ASIC可以位于基站或终端中。当然，处理器和存储介质也可以作为分立组件存在于基站或终端中。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机程序或指令。在计算机上加载和执行所述计算机程序或指令时，全部或部分地执行本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、基站、用户设备或者其它可编程装置。所述计算机程序或指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机程序或指令可以从一个网站站点、计算机、服务器或数据中心通过有线或无线方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是集成一个或多个可用介质的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，例如，软盘、硬盘、磁带；也可以是光介质，例如，数字视频光盘；还可以是半导体介质，例如，固态硬盘。该计算机可读存储介质可以是易失性或非易失性存储介质，或可包括易失性和非易失性两种类型的存储介质。
在本申请的各个实施例中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，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的情况，其中A，B可以是单数或者复数。在本申请的文字描述中，字符“/”，一般表示前后关联对象是一种“或”的关系；在本申请的公式中，字符“/”，表示前后关联对象是一种“相除”的关系。
可以理解的是，在本申请的实施例中涉及的各种数字编号仅为描述方便进行的区分，并不用来限制本申请的实施例的范围。上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定。

Claims (35)

  1. 一种通信方法，其特征在于，所述方法包括：
    通过远端终端设备与接入网设备之间的接口，接收来自所述接入网设备的配置消息，所述配置消息包括中继终端设备的信息；
    根据所述中继终端设备的信息，向所述中继终端设备发送指示信息，所述指示信息触发所述中继终端设备进入RRC连接态。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    根据所述中继终端设备的RRC状态，确定需要触发所述中继终端设备进入RRC连接态。
  3. 如权利要求2所述的方法，其特征在于，所述配置消息还包括状态信息，所述状态信息指示所述中继终端设备的RRC状态；
    所述方法还包括：
    根据所述状态信息，确定所述中继终端设备的RRC状态。
  4. 如权利要求2或3所述的方法，其特征在于，所述指示信息是响应于所述配置消息的配置完成消息。
  5. 如权利要求1至3中任一项所述的方法，其特征在于，所述方法还包括：
    通过所述远端终端设备与所述接入网设备之间的接口，向所述接入网设备发送响应于所述配置消息的配置完成消息。
  6. 如权利要求1至3、5中任一项所述的方法，其特征在于，
    向所述中继终端设备发送指示信息，包括：向所述中继终端设备发送请求消息，所述请求消息包括所述指示信息，所述请求消息用于请求建立单播连接，所述指示信息指示建立单播连接是为了获取所述中继终端设备的中继服务；或者，
    所述指示信息是用于请求建立与中继服务相关的单播连接的请求消息。
  7. 如权利要求1至3、5中任一项所述的方法，其特征在于，所述指示信息是PC5-S信令、PC5 RRC消息或边链路媒体接入控制控制单元SL MAC CE信令。
  8. 如权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    确定所述远端终端设备与所述中继终端设备之间发生链路失败或连接失败，向所述接入网设备发送第一失败指示信息，所述第一失败指示信息指示所述远端终端设备与所述中继终端设备之间发生链路失败或连接失败。
  9. 如权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    确定所述远端终端设备与所述接入网设备之间发生链路失败或连接失败，通过所述中继终端设备向所述接入网设备发送第二失败指示信息，所述第二失败指示信息指示所述远端终端设备与所述接入网设备之间发生链路失败或连接失败。
  10. 如权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    接收来自所述中继终端设备的第三失败指示信息，所述第三失败指示信息指示所述中继终端设备与所述接入网设备之间发生链路失败或连接失败；
    向所述接入网设备发送第四失败指示信息，所述第四失败指示信息指示所述中继终端设备与所述接入网设备之间发生链路失败或连接失败。
  11. 如权利要求1至10中任一项所述的方法，其特征在于，所述方法还包括：
    通过所述远端终端设备与接入网设备之间的接口，向所述接入网设备发送至少一个候选终端设备的信息，所述至少一个候选终端设备包括所述中继终端设备，所述至少一个候选终端设备的信息包括所述候选终端设备的信号质量和/或用于指示所述候选终端设备是否支持多路径中继的信息。
  12. 如权利要求11所述的方法，其特征在于，所述方法还包括：
    接收来自所述候选终端设备的发现消息，所述发现消息中包括用于指示所述候选终端设备是否支持多路径中继的信息。
  13. 如权利要求11所述的方法，其特征在于，所述方法还包括：
    接收来自所述候选终端设备的发现消息，所述发现消息对应的所述候选终端设备的标识信息用于指示所述候选终端设备是否支持多路径中继。
  14. 一种通信方法，其特征在于，包括：
    接收来自远端终端设备的指示信息，所述指示信息触发所述接入网设备进入RRC连接态；
    向接入网设备发送边链路用户信息，所述边链路用户信息包括所述远端终端设备的信息和/或中继终端设备的信息。
  15. 如权利要求14所述的方法，其特征在于，所述方法还包括：
    根据所述指示信息，进入RRC连接态。
  16. 如权利要求14或15所述的方法，其特征在于，所述指示信息是PC5-S信令、PC5 RRC消息、边链路媒体接入控制控制单元SL MAC CE信令或来自所述中继终端设备的配置完成消息。
  17. 如权利要求14或15所述的方法，其特征在于，所述接收来自远端终端设备的指示信息，包括：接收来自所述远端终端设备的请求消息，所述请求消息包括所述指示信息，所述请求消息用于请求建立单播连接，所述指示信息指示建立单播连接是为了获取所述中继终端设备的中继服务；或者，
    所述指示信息是用于请求建立与中继服务相关的单播连接的请求消息。
  18. 如权利要求14至17中任一项所述的方法，其特征在于，所述方法还包括：
    确定所述中继终端设备与所述接入网设备之间发生链路失败或连接失败，向所述远端终端设备发送失败指示信息，所述失败指示信息指示所述中继终端设备与所述接入网设备之间发生链路失败或连接失败。
  19. 如权利要求14至18中任一项所述的方法，其特征在于，所述方法还包括：
    向所述远端终端设备发送发现消息，所述发现消息中包括用于指示所述中继终端设备支持多路径中继的信息。
  20. 如权利要求14至18中任一项所述的方法，其特征在于，所述方法还包括：
    向所述远端终端设备发送发现消息，所述发现消息对应的所述中继终端设备的标识信息用于指示所述中继终端设备支持多路径中继。
  21. 一种通信方法，其特征在于，所述方法包括：
    通过远端终端设备与接入网设备之间的接口，向所述远端终端设备发送配置消息，所述配置消息包括中继终端设备的信息和状态信息，所述状态信息指示所述中继终端设备的RRC状态；
    接收来自所述中继终端设备的边链路用户信息，所述边链路用户信息包括所述中继终端设备的信息和所述远端终端设备的信息。
  22. 如权利要求21所述的方法，其特征在于，所述方法还包括：
    通过所述远端终端设备与所述接入网设备之间的接口，接收来自所述远端终端设备的响应于所述配置消息的配置完成消息；或者，
    通过所述中继终端设备，接收来自所述远端终端设备的响应于所述配置消息的配置完成消息。
  23. 如权利要求21或22所述的方法，其特征在于，所述方法还包括：
    通过远端终端设备与所述接入网设备之间的接口，接收来自所述远端终端设备的至少一个候选终端设备的信息，所述至少一个候选终端设备的信息包括所述候选终端设备的信号质量和/或用于指示所述候选终端设备是否支持多路径中继的信息；
    根据所述至少一个候选终端设备的信息，从所述至少一个候选终端设备中选择所述中继终端设备。
  24. 一种通信方法，其特征在于，所述方法包括：
    确定中继终端设备是否需要为远端终端设备转发控制面信令；
    向所述中继终端设备发送通知信息，所述通知信息用于确定所述中继终端设备是否需要为所述远端终端设备转发控制面信令。
  25. 如权利要求24所述的方法，其特征在于，所述确定中继终端设备是否需要为所述远端终端设备转发控制面信令，包括：
    当所述远端终端设备能够通过所述远端终端设备与接入网设备之间的接口接收来自所述接入网设备的控制面信令，则确定所述中继终端设备不需要为所述远端终端设备转发控制面信令；
    当所述远端终端设备不能够通过所述远端终端设备与接入网设备之间的接口接收来自所述接入网设备的控制面信令，则确定所述中继终端设备需要为所述远端终端设备转发控制面信令。
  26. 一种通信方法，其特征在于，所述方法包括：
    接收来自接入网设备的通知信息，所述通知信息用于确定中继终端设备是否需要为远端终端设备转 发控制面信令；
    根据所述通知信息，确定需要为所述远端终端设备转发控制面信令，或确定不需要为所述中继终端设备转发控制面信令。
  27. 如权利要求26所述的方法，其特征在于，所述通知信息指示所述中继终端设备提供的中继服务类型；
    所述根据所述通知信息，确定需要为所述远端终端设备转发控制面信令，或确定不需要为所述中继终端设备转发控制面信令，包括：
    根据所述中继终端设备提供的中继服务类型，确定需要为所述远端终端设备转发控制面信令，或确定不需要为所述中继终端设备转发控制面信令。
  28. 一种通信装置，其特征在于，包括用于执行如权利要求1至13中任一项所述方法的模块，或执行如权利要求14至20中任一项所述方法的模块，或执行如权利要求21至23中任一项所述方法的模块，或执行如权利要求24或25所述方法的模块，或执行如权利要求26或27所述方法的模块。
  29. 一种通信装置，其特征在于，包括处理器和接口电路，所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置，所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1至13中任一项所述的方法，或实现如权利要求14至20中任一项所述的方法，或实现如权利要求21至23中任一项所述的方法，或实现如权利要求24或25所述的方法，或实现如权利要求26或27所述的方法。
  30. 一种计算机程序产品，其特征在于，包括计算机程序，当所述计算机程序被通信装置执行时，实现如权利要求1至27中任一项所述的方法。
  31. 一种计算机可读存储介质，其特征在于，所述存储介质中存储有计算机程序或指令，当所述计算机程序或指令被通信装置执行时，实现如权利要求1至27中任一项所述的方法。
  32. 一种通信系统，其特征在于，包括用于执行如权利要求1至13中任一项所述方法的远端终端设备，和用于执行如权利要求14至20中任一项所述方法的中继终端设备。
  33. 如权利要求32所述的系统，其特征在于，所述系统还包括用于执行如权利要求21至23中任一项所述方法的接入网设备。
  34. 一种通信系统，其特征在于，包括用于执行如权利要求24或25所述方法的接入网设备，和用于执行如权利要求26或27所述方法的中继终端设备。
  35. 一种芯片系统，其特征在于，包括：处理器，所述处理器用于执行权利要求1至27中任一项所述的方法。
PCT/CN2023/110194 2022-08-02 2023-07-31 一种通信方法、通信装置及通信系统 WO2024027636A1 (zh)

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