WO2022002134A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2022002134A1
WO2022002134A1 PCT/CN2021/103548 CN2021103548W WO2022002134A1 WO 2022002134 A1 WO2022002134 A1 WO 2022002134A1 CN 2021103548 W CN2021103548 W CN 2021103548W WO 2022002134 A1 WO2022002134 A1 WO 2022002134A1
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WIPO (PCT)
Prior art keywords
terminal device
indication information
communication
network device
network
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PCT/CN2021/103548
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English (en)
French (fr)
Inventor
姚楚婷
徐海博
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华为技术有限公司
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Publication of WO2022002134A1 publication Critical patent/WO2022002134A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a communication method and device.
  • Sidelink (sidelink, SL) communication eliminates the need to communicate between terminal devices through network devices, thereby helping to reduce the communication delay between terminal devices.
  • users can use augmented reality (AR)/virtual reality (VR) glasses to watch videos stored in the phone.
  • AR augmented reality
  • VR virtual reality
  • the phone sends the video to the AR/VR glasses through SL, thereby presented to the user. Therefore, when the mobile phone and AR/VR glasses perform SL communication, the research on power saving of the mobile phone and AR/VR glasses has important practical value.
  • the present application provides a communication method and apparatus.
  • the mobile phone can know that the communication between the AR/VR glasses and the network device is completed.
  • a first aspect is a communication method according to an embodiment of the present application, which specifically includes: establishing a PC5-S connection between a first terminal device and a second terminal device. Then, the first terminal device receives the first indication information.
  • the PC5-S connection is used for the second terminal device to communicate with the first terminal device
  • the PC5-S connection is used for the second terminal device to communicate with the network device
  • the first indication information is used to indicate the relationship between the second terminal device and the network device. Communication ends.
  • a PC5-S connection is established between the first terminal device and the second terminal device, and the PC5-S connection is used for the communication between the second terminal device and the first terminal device and for the communication between the second terminal device and the network device.
  • the first indication information can be received, so that the first terminal device can know that the communication between the second terminal device and the network device has ended.
  • the first terminal device can determine whether it can enter the idle state or the inactive state according to its own communication requirements. Compared with the fact that the first terminal device cannot know the end of the communication between the second terminal device and the network device and needs to keep the active state all the time, there are It helps to improve the possibility of saving the power consumption of the first terminal device.
  • the first terminal device after receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device. This helps the first terminal device to save power consumption.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • the first terminal device may determine, according to the first indication information, that the communication between the second terminal device and the network device ends, for example, the relay service between the second terminal device and the network device ends, Or the authentication process of the network device for the second terminal device ends, or the RRC connection between the second terminal device and the network device is disconnected, and enters an idle state or an inactive state, so that the first terminal device can If there is a communication requirement and/or whether the second terminal device and the network device have a communication requirement, it is determined whether to request the network device to release the RRC connection with the first terminal device, so as to save the power consumption of the first terminal device.
  • the first terminal device receives the first indication information from the second terminal device; and/or the first terminal device receives the first indication information from the network device.
  • the second terminal device and/or the network device can send the first indication information to the first terminal device, so that the first terminal device can know that the communication between the second terminal device and the network device has ended.
  • the second aspect is a communication method according to an embodiment of the application, which specifically includes establishing a PC5-S connection between the second terminal device and the first terminal device, ending the communication between the second terminal device and the first terminal device, and sending the first terminal device to the first terminal device.
  • the terminal device sends the first indication information.
  • the PC5-S connection is used for the second terminal device to communicate with the first terminal device
  • the PC5-S connection is used for the second terminal device to communicate with the network device
  • the first indication information is used to instruct the second terminal device to communicate with the network Communication with the device ends.
  • the second terminal device can send the first indication information to the first terminal device, so that the first terminal device can know that the communication between the second terminal device and the network device has ended, and the first terminal device can, according to its own Communication requirements, judging whether it can enter the idle state or the inactive state, compared with the first terminal device being unable to know the end of the communication between the second terminal device and the network device and needing to keep the active state all the time, it helps to save the first terminal device. the possibility of power consumption.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter the inactive state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle state.
  • the second terminal device receives a first message from the network device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device. Therefore, it is helpful to enable the second terminal device to release the RRC connection with the network device according to the first message.
  • a third aspect is a communication method according to an embodiment of the present application, which specifically includes: a network device communicates with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device, and the PC5-S is connected For the first terminal device to communicate with the second terminal device.
  • the communication between the network device and the second terminal device ends, and first indication information is sent to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • the network device can send the first indication information to the first terminal device, so that the first terminal device can know that the communication between the second terminal device and the network device has ended, and then the first terminal device can meet its own communication requirements. , judging whether it can enter the idle state or the inactive state, compared with the fact that the first terminal device cannot know the end of the communication between the second terminal device and the network device and needs to keep the active state all the time, it helps to save the power consumption of the first terminal device. possibility.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter the inactive state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle state.
  • the network device receives an assistance message sent by the first terminal device, where the assistance information is used to request to release the RRC connection between the first terminal device and the network device. Therefore, the first terminal device can enter an idle state after the communication between the second terminal device and the network device is completed, which helps the first terminal device to save power consumption.
  • the network device sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device. Therefore, it is helpful for the second terminal device to release the RRC connection with the network device according to the first message.
  • a fourth aspect is another communication method according to an embodiment of the present application, which specifically includes: establishing a PC5-S connection between the first terminal device and the second terminal device; and receiving first indication information.
  • the PC5-S connection is used for the second terminal device to communicate with the network device, the first indication information is used to indicate the end of the communication between the second terminal device and the network device, or the first indication information is used to instruct the first terminal device to monitor the first 2.
  • the first terminal device when the first terminal device establishes a PC5-S connection with the second terminal device, and the PC5-S connection is used for the communication between the second terminal device and the network device, the first terminal device can receive the first indication information, so that the first terminal device can receive the first indication information.
  • the device can know that the communication between the second terminal device and the network device has ended, or know that the first terminal device needs to monitor the paging timing of the second terminal device, so as to avoid missing the network when the second terminal device enters the idle state or the inactive state. The paging of the device for the second terminal device.
  • the first terminal device can also determine whether it can enter an idle state or an inactive state in combination with its own communication requirements and/or the communication requirements of the second terminal device, and communicate with the first terminal device. Compared with the fact that the device cannot know the end of the communication between the second terminal device and the network device and needs to keep the active state all the time, it helps to improve the possibility of saving the power consumption of the first terminal device.
  • the first terminal device after receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device.
  • the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device.
  • the first terminal device after receiving the first indication information, the first terminal device monitors the PO of the second terminal device.
  • the above technical solution helps to reduce the possibility of missing the paging of the second terminal device by the network device when the second terminal device enters the idle state or the inactive state.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to instruct the second terminal device to enter the inactive state; or,
  • the first indication information is used to instruct the second terminal device to enter the idle state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • the first terminal device can determine that the communication between the second terminal device and the network device is ended according to the first indication information, for example, the RRC connection between the second terminal device and the network device is disconnected and enters an idle state or an inactive state , so that the first terminal device can judge whether to monitor the paging of the second terminal device according to the first indication information, so as to reduce the possibility that the second terminal device misses the paging of the network device.
  • the first terminal may also determine whether to request the network device to release the RRC connection with the first terminal device according to the first indication information and the communication requirement of the first terminal, so as to save power consumption of the first terminal device.
  • the first terminal device receives the first indication information from the second terminal device; and/or the first terminal device receives the first indication information from the network device. Therefore, it is helpful for the first terminal device to obtain the first indication information, to know that the communication between the second terminal device and the network device is ended, or to monitor the PO of the second terminal device.
  • a fifth aspect is another communication method according to an embodiment of the present application, which specifically includes establishing a PC5-S connection between the second terminal device and the first terminal device, ending the communication between the second terminal device and the network device, and sending the communication to the first terminal device.
  • Send the first indication information The PC5-S connection is used for the second terminal device to communicate with the network device, the first indication information is used to indicate the end of the communication between the second terminal device and the network device, or the first indication information is used to instruct the first terminal device to monitor the first PO of the two terminal equipment.
  • the second terminal device can send the first indication information to the first terminal device, so that the first terminal device can know that the communication between the second terminal device and the network device has ended, or that the first terminal device needs to monitor the second terminal device.
  • the paging timing of the device is used to avoid omitting the paging of the second terminal device by the network device when the second terminal device enters an idle state or an inactive state.
  • the first terminal device can also determine whether it can enter an idle state or an inactive state in combination with its own communication requirements and/or the communication requirements of the second terminal device, and communicate with the first terminal device. Compared with the fact that the device cannot know the end of the communication between the second terminal device and the network device and needs to keep the active state all the time, it helps to improve the possibility of saving the power consumption of the first terminal device.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to instruct the second terminal device to enter the inactive state; or,
  • the first indication information is used to instruct the second terminal device to enter the idle state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • the second terminal device receives the first message sent by the network device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device. Therefore, the second terminal device can release the RRC connection with the network device according to the first message.
  • a sixth aspect is another communication method according to an embodiment of the present application, which specifically includes: a network device communicates with the second terminal device through a PC5-S connection between the first terminal device and the second terminal device.
  • the communication between the network device and the second terminal device ends, and the first indication information is sent to the first terminal device, where the first indication information is used to indicate the end of the communication between the second terminal device and the network device, or the first indication information is used to indicate the first A terminal device monitors the PO of the second terminal device.
  • the network device can send the first indication information to the first terminal device, so that the first terminal device can know that the communication between the second terminal device and the network device has ended, or that the first terminal device needs to monitor the second terminal device.
  • the paging occasion is used to avoid missing the paging of the second terminal device by the network device when the second terminal device enters the idle state or the inactive state.
  • the first terminal device can also determine whether it can enter an idle state or an inactive state in combination with its own communication requirements and/or the communication requirements of the second terminal device, and communicate with the first terminal device. Compared with the fact that the device cannot know the end of the communication between the second terminal device and the network device and needs to keep the active state all the time, it helps to improve the possibility of saving the power consumption of the first terminal device.
  • the embodiment of the present application may implement the first indication information for indicating the end of the communication between the second terminal device and the network device in the following manner:
  • the first indication information is used to instruct the second terminal device to enter the inactive state; or,
  • the first indication information is used to instruct the second terminal device to enter the idle state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • the network device receives an assistance message sent by the first terminal device, where the assistance information is used to request to release the RRC connection between the first terminal device and the network device. Therefore, the first terminal device can enter an idle state after the communication between the second terminal device and the network device is completed, which helps the first terminal device to save power consumption.
  • the network device sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device. Therefore, it is helpful to enable the second terminal device to release the RRC connection with the network device according to the first message.
  • a communication device comprising: a processor and a memory. Therein, the processor and the memory are coupled.
  • the communication apparatus may be a terminal device or a chip or a system on a chip in the terminal device.
  • the memory stores a computer program or instruction, and when the computer program or instruction is executed by the processor, the communication device enables the communication device to perform any possible design method of the first aspect or the second aspect, or to perform any of the fourth aspect or the fifth aspect. A possible design method.
  • the communication device may be a network device, a device in a network device, or a device that can be used in conjunction with the network device.
  • the memory stores computer programs or instructions, and when the computer programs or instructions are executed by the processor, enables the communication apparatus to perform any of the possible designs of the third aspect or the sixth aspect.
  • it is a communication device according to an embodiment of the present application, comprising a functional module for executing any of the possible designs of the first aspect to the sixth aspect.
  • a ninth aspect is a computer-readable storage medium according to an embodiment of the present application, and a computer program or instruction is stored in the computer-readable storage medium, and when it is run on a computer, the computer can be made to execute the above-mentioned first to sixth aspects.
  • a tenth aspect is a computer program product including a computer program or instructions according to an embodiment of the present application, which, when executed on a computer, enables the computer to execute any of the possible design methods in the first to sixth aspects.
  • An eleventh aspect is a chip according to an embodiment of the present application.
  • the chip includes a processor.
  • the processor executes a computer program or an instruction, the processor is configured to execute any of the possible designs in the first to sixth aspects above. method.
  • the computer program or instructions can come from a memory inside the chip or from a memory outside the chip.
  • the chip further includes an input and output circuit.
  • a twelfth aspect provides a communication system, including network equipment and terminal equipment.
  • the terminal device is configured to execute the method of any possible design of the first aspect, the second aspect, the fourth aspect and/or the fifth aspect.
  • the network device is configured to perform the method of any possible design of the third aspect and/or the fifth aspect.
  • FIG. 1 is a network architecture diagram of a sideline communication according to an embodiment of the application
  • FIG. 2 is a network architecture diagram of another side line communication according to an embodiment of the present application.
  • FIG. 3 is a network architecture diagram of a communication system according to an embodiment of the application.
  • FIG. 4 is a schematic flowchart of a communication method according to an embodiment of the application.
  • FIG. 5 is a schematic flowchart of another communication method according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the application.
  • FIG. 7 is a schematic structural diagram of another communication device according to an embodiment of the present application.
  • the terminal device in this embodiment of the present application includes a device that provides voice and/or data connectivity to the user.
  • a terminal device includes a device that provides voice to a user, or includes a device that provides data connectivity to a user, or includes a device that provides both voice and data connectivity to a user.
  • an end device may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem.
  • terminal devices may communicate with the core network via a radio access network (RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • RAN radio access network
  • the terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, vehicle to everything (V2X) terminal Equipment, machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, subscription unit (subscriber unit), subscription station ( subscriber station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), User agent, or user device, etc.
  • mobile phones or "cellular" phones
  • computers with mobile terminal equipment portable, pocket-sized, hand-held, computer-built-in mobile devices, and the like.
  • PCS personal communication service
  • SIP session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the terminal device may also include limited devices, such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, and the like.
  • devices with low power consumption or devices with limited storage capabilities, or devices with limited computing capabilities, and the like.
  • devices with limited devices including barcodes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning system (global positioning system, GPS), laser scanners and other information sensing equipment, tablet computers (pad), smart screens, wireless transceivers Computer, VR terminal, AR terminal, wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the deployment location can be on land, including indoor or outdoor, handheld or vehicle; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites, etc.).
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. Wait.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-scale, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, which needs to cooperate with other devices such as smart phones.
  • Use such as all kinds of smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.
  • the various terminal devices described above if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as on-board terminal equipment.
  • the on-board terminal equipment is also called on-board unit (OBU). ).
  • the terminal device may further include a relay.
  • any device capable of performing data communication with the access network device may be regarded as a terminal device.
  • the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, such as a chip system, and the apparatus may be installed in the terminal device.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the network device includes an access network (AN) device, such as a base station (eg, an access point), which may refer to an access network that communicates with a wireless terminal device through one or more cells over an air interface.
  • AN access network
  • the device or for example, a network device in a vehicle-to-everything (V2X) technology is a road side unit (RSU).
  • the base station can be used to convert received air frames to and from internet protocol (IP) packets and act as a router between the end device and the rest of the access network, which can include the IP network.
  • IP internet protocol
  • the RSU can be a fixed infrastructure entity supporting V2X applications and can exchange messages with other entities supporting V2X applications.
  • the access network equipment can also coordinate the attribute management of the air interface.
  • the access network equipment may include a long term evolution (long term evolution, LTE) system or an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B in long term evolution-advanced, LTE-A). ), or may also include the next generation node B (gNB) in the 5th generation mobile communication technology (the 5th generation, 5G) NR system (also referred to as the NR system), or may also include a cloud access network
  • the embodiment of the present application is not limited to a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) in a (cloud radio access network, Cloud RAN) system.
  • the network device may also include core network devices, and the core network devices include, for example, access and mobility management functions (access and mobility management functions, AMF), session management functions (session management functions, SMF) in the 5G system Or user plane function (user plane function, UPF), etc., or include mobility management entity (mobility management entity, MME) in 4G system, etc.
  • AMF access and mobility management functions
  • SMF session management functions
  • UPF user plane function
  • MME mobility management entity
  • the apparatus for implementing the function of the network device may be the network device, or may be an apparatus capable of supporting the network device to implement the function, such as a chip system, and the apparatus may be installed in the network device.
  • the technical solutions provided by the embodiments of the present application are described by taking the device for realizing the function of the network device being a network device as an example.
  • At least one means one or more, and “plurality” means two or more.
  • And/or which describes the relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, it can indicate that A exists alone, A and B exist at the same time, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects are an “or” relationship.
  • At least one item(s) below” or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one item (a) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple .
  • ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, and timing of multiple objects , priority or importance, etc.
  • the first configuration information and the second configuration information are only for distinguishing different configuration information, but do not indicate the difference in the information amount, content, priority, or importance of the two configuration information.
  • FIG. 1 it is a network architecture diagram of sideline communication, including core network equipment, access network equipment, mobile phones, and smart glasses.
  • the smart glasses may be augmented reality (AR)/virtual reality (VR) glasses.
  • AR augmented reality
  • VR virtual reality
  • the smart glasses and the mobile phone can communicate through a sidelink (SL) link without passing through an access network device.
  • the direct communication between smart glasses and mobile phones can be called sideline communication, ie SL communication.
  • a network coverage (in coverage, IC) scenario the transmission resources used for SL communication can be scheduled by the access network device; in an out of network coverage (out of coverage, OOC) scenario,
  • the transport resources used for SL communication may be preconfigured resources.
  • the smart glasses and the mobile phone shown in FIG. 1 can respectively communicate with the access network device through the Uu port. In this case, therefore, for the smart glasses, it is still necessary to access the network through the Uu port alone, which is easy to increase the power consumption of the smart glasses.
  • the smart glasses can communicate with the access network device through the mobile phone, that is, the communication between the smart glasses and the network device can be transferred through the mobile phone, so the Uu port on the smart glasses can be removed. , or do not use the Uu port on the smart glasses.
  • the smart glasses are remote terminal equipment
  • the mobile phone is a relay terminal equipment.
  • Mobile phones provide relay services for smart glasses.
  • the relay mentioned here can be understood as: the information sent by the smart glasses to the access network device is sent to the access network device through the mobile phone, and the information sent by the access network device to the smart glasses is also sent to the smart glasses through the mobile phone.
  • the mobile phone in order to ensure the reliability of the communication between the smart glasses and the access network device, the mobile phone needs to be in a connected state.
  • the information sent by the smart glasses to the access network device, or the information sent by the access network device to the smart glasses is transparent to the mobile phone. Therefore, even if the communication between the smart glasses and the access network device ends, for example, the authentication process of the access network device for the smart glasses ends, or the relay service between the smart glasses and the access network ends, the mobile phone will always be in the In the connected state, it is impossible to enter the idle state or the inactive state, so it is easy to increase the power consumption of the mobile phone.
  • FIG. 2 it is a network architecture diagram of communication on the other side, including a core network device, an access network device, a terminal device 1 and a terminal device 2 .
  • the terminal device may need to communicate with the network device through the side link between the terminal devices due to poor signal, out-of-coverage, or no Uu function.
  • the terminal device 2 takes the terminal device 2 as an example.
  • the terminal device 2 has poor signal coverage or is outside the network coverage, that is, when the terminal device 2 is not covered by the network, or when the terminal device 2 does not have the Uu function, the communication between the terminal device 2 and the access network device or the core network device
  • the terminal device 1 needs to be relayed, or the terminal device 2 needs to communicate with the access network device or the core network device through the terminal device 1 .
  • the terminal device 2 does not have a Uu port, the terminal device 2 does not have the Uu function.
  • terminal equipment 2 is a remote terminal equipment
  • terminal equipment 1 is a relay terminal equipment
  • terminal equipment 1 provides relay for terminal equipment 2 Serve.
  • the relay mentioned here can be understood as: the information sent by the terminal device 2 to the access network device is sent to the access network device through the terminal device 1, and the information sent by the access network device to the terminal device 2 is also sent through the terminal device. 1 is sent to terminal device 2.
  • the terminal device 1 needs to be in a connected state.
  • the terminal device 1 acts as a relay terminal device of the terminal device 2, the information sent by the terminal device 2 to the access network device or the core network device, or the information sent by the access network device or the core network device to the terminal device 2
  • the information is transparent to the terminal device 1. Therefore, even if the communication between the terminal device 2 and the access network device ends, or the terminal device 2 enters an idle state or an inactive state, the terminal device 1 is always in the connected state, so it is easy to The power consumption of the terminal device 1 is increased.
  • the terminal equipment 1 may need to help the terminal equipment 2 to monitor the paging occasion (PO) to prevent the terminal equipment 2 from missing paging, the terminal equipment 1 does not know when the communication of the terminal equipment 2 ends and needs to receive Paging, and therefore always monitoring the PO of the terminal device 2, will increase the power consumption of the terminal device 1.
  • PO paging occasion
  • an embodiment of the present application provides a communication method.
  • the relay terminal device can know the end of the communication between the remote terminal device and the network device.
  • FIG. 3 it is a network architecture diagram of a communication system according to an embodiment of the present application, including a network device, a first terminal device, and a second terminal device.
  • a network device for the first terminal device and the second terminal device, please refer to the relevant introduction about the terminal device in the above terminology explanation, and for the network device, please refer to the relevant introduction about the network device in the above terminology explanation, which will not be repeated here.
  • the network architecture of the communication system shown in FIG. 3 is only an example, and does not constitute a limitation on the network architecture of the communication system in the embodiment of the present application.
  • the communication system in this embodiment of the present application may include three or more terminal devices.
  • the communication method in the embodiment of the present application may be applied to a D2D scene, a V2X scene, or the like.
  • DD scenes may include NR-D2D scenes and the like.
  • the V2X scene may include an NR-V2X scene and the like.
  • the communication method of the embodiments of the present application can also be applied to the Internet of Vehicles, such as vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), etc., or can be applied to intelligent Driving, assisted driving, or intelligent networked vehicles and other fields.
  • the communication method in this embodiment can also be applied to a relay scenario, such as layer 2 relay.
  • users can now have many kinds of terminal devices, such as mobile phones, smart watches, smart bracelets, smart wireless earphones or smart glasses, etc. Other devices except mobile phones do not need to set Uu ports, and other devices can be connected through mobile phones.
  • Network carry out SL communication controlled by the network, or control the communication of the device in SL by the mobile phone.
  • SL communication between smart glasses and mobile phones users can watch VR videos on mobile phones on smart glasses, and even VR videos in the cloud.
  • a smart wireless headset that enables users to listen to music through SL communication with a mobile phone.
  • the terminal equipment is not covered by the network.
  • the basement signal is not enough to support communication.
  • the terminal equipment located in the basement can be connected to the network through the terminal equipment located upstairs to establish a communication link and expand the coverage of the existing network.
  • the first terminal device has a Uu port, can communicate with network devices, and can be used as a relay terminal (relay UE); the second terminal device can be used as a remote terminal (remote UE) and may not have a Uu port and cannot communicate with the network device.
  • the device communicates directly, or the second terminal device may also have a Uu port.
  • the first terminal device and the second terminal device can perform SL communication.
  • the network device serving the first terminal device can use the first terminal device to The second terminal device provides configuration information.
  • Embodiment 1 The first terminal device and the second terminal device need to perform direct communication (ie, SL communication), and the second terminal device and the network device need to perform relay services.
  • direct communication ie, SL communication
  • relay services ie, relay services
  • FIG. 4 it is a schematic flowchart of a communication method according to an embodiment of the present application, which specifically includes the following steps.
  • the first terminal device establishes a first connection with the second terminal device.
  • the first terminal device and the second terminal device need to perform direct connection communication (ie, SL communication), and the second terminal device and the network device need to perform relay services
  • the first connection is used for the second terminal device.
  • Communication with the first terminal device and the first connection is for the second terminal device to communicate with the network device.
  • the first connection is a PC5-S connection, or other connections, such as a PC5-RRC connection.
  • the first terminal device and the second terminal device perform a direct connection communication service based on the first connection, and the second terminal device establishes a connection with the network device based on the first connection.
  • the first terminal device and the second terminal device Before establishing the PC5-S connection, optionally, the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device, and/or the second terminal device discovers the first terminal device.
  • the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device and the second terminal device discovers the first terminal device.
  • the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device, or the second terminal device discovers the first terminal device.
  • the second terminal device may discover the first terminal device based on Pre-configuration resources, or the second terminal device may discover the first terminal device based on network-configured resources, for example, based on network
  • the configuration may be a configuration resource received by a terminal (including the first terminal) from a network device, and sent by broadcasting, and the second terminal device receives the configuration of the resource.
  • the manner in which the first terminal equipment discovers the second terminal equipment is similar to the manner in which the second terminal equipment discovers the first terminal equipment.
  • the first terminal equipment may discover the second terminal equipment based on the Pre-configuration resource, or the first terminal equipment may discover the second terminal equipment
  • the second terminal device may be discovered based on network-configured resources.
  • the first terminal device when the first terminal device has discovered the second terminal device, or the second terminal device has discovered the first terminal device, it is not necessary to repeat the device discovery process before establishing the PC5-S connection .
  • the first terminal device in the case that the first terminal device has discovered the second terminal device and the second terminal device has discovered the first terminal device, it is also not necessary to repeat the device discovery process before establishing the PC5-S connection.
  • the first terminal device and the second terminal device have performed a device discovery process, so that the first terminal device discovers the second terminal device, and/or the second terminal device discovers the first terminal device.
  • the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device and the second terminal device discovers the first terminal device, that is, the first terminal device and the second terminal device discover the first terminal device.
  • the first terminal device and the second terminal device can know each other's existence after performing the device discovery process.
  • the first terminal device sends a broadcast message, and the broadcast message may be used to indicate information of the first terminal device.
  • other terminal devices (such as the second terminal device) can reply to the first terminal device, which completes the mutual discovery between the first terminal device and the second terminal device.
  • the second terminal device sends a broadcast message, where the broadcast message is used to indicate information of the second terminal device.
  • other terminal devices eg, the first terminal device
  • the broadcast message is used to find a terminal device that satisfies the condition (for example, the broadcast message is used to indicate one or more services), then the terminal device that can support the above-mentioned service is the one that meets the condition. terminal equipment.
  • the second terminal device After receiving the broadcast message, other terminal devices (eg, the second terminal device) will reply to the first terminal device if the conditions are met, which completes the mutual discovery between the first terminal device and the second terminal device.
  • the second terminal device sends a broadcast message, and the broadcast message is used to find a terminal device that satisfies the condition (for example, if the broadcast message is used to indicate one or more services, the terminal device that can support the above-mentioned services is the one that meets the condition. Terminal Equipment).
  • other terminal devices eg, the first terminal device
  • the first terminal device sends a broadcast message, where the broadcast message includes information of the second terminal device.
  • other terminal devices such as the second terminal device
  • the second terminal device sends a broadcast message, where the broadcast message includes information of the first terminal device.
  • other terminal devices eg, the first terminal device
  • the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device, or the second terminal device discovers the first terminal device.
  • the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device, the first terminal device can know the existence of the second terminal device, but the second terminal device does not know the first terminal device.
  • the presence of terminal equipment For another example, if the first terminal device and the second terminal device perform a device discovery process, so that the second terminal device discovers the first terminal device, the second terminal device can know the existence of the first terminal device, but the first terminal device does not know the existence of the first terminal device.
  • the presence of two terminal devices are examples of two terminal devices.
  • the second terminal device discovering the first terminal device as an example.
  • the first terminal device sends a broadcast message, and the broadcast message can be used to indicate the information of the first terminal device, or the broadcast message can be used to find a terminal device that meets the conditions (for example, if one or more services are provided, it can support the above-mentioned services.
  • the terminal equipment is the terminal equipment that meets the conditions).
  • other terminal devices for example, the second terminal device
  • discover the first terminal device that is, know the existence of the first terminal device.
  • take the first terminal device discovering the second terminal device as an example.
  • the second terminal device sends a broadcast message, and the broadcast message can be used to indicate the information of the second terminal device, or the broadcast message can be used to find a terminal device that satisfies the conditions (for example, if one or more services are provided, it can support the above-mentioned services)
  • the terminal equipment is the terminal equipment that meets the conditions).
  • other terminal devices for example, the first terminal device
  • discover the second terminal device that is, know the existence of the second terminal device.
  • the first terminal device and the second terminal device execute the process of establishing a PC5-S connection.
  • the second terminal device may initiate a process of establishing a PC5-S connection to the first terminal device.
  • the second terminal device sends a PC5-S connection establishment request to the first terminal device, and the first terminal device receives the PC5-S connection establishment request. If the first terminal device is in the connected state, it confirms that the PC5-S can be established.
  • a PC5-S connection establishment completion message is sent to the second terminal device, thereby establishing a PC5-S connection between the first terminal device and the second terminal device.
  • the first terminal device receives the PC5-S connection establishment request, if the first terminal device is in an idle state or inactive state, it is triggered to enter the connected state, and after confirming that the PC5-S connection can be established, it sends the request to the second terminal.
  • the device sends a PC5-S connection establishment complete message.
  • the first terminal device can also initiate the establishment of the PC5-S connection to the second terminal device. Specifically, the first terminal device sends the PC5-S connection to the second terminal device.
  • the second terminal device receives the PC5-S connection establishment request, and sends a PC5-S connection establishment completion message to the first terminal device, thereby establishing a PC5-S connection between the first terminal device and the second terminal device .
  • the establishment of the PC5-S connection may be initiated by the first terminal device or initiated by the second terminal device, which is not limited .
  • the first terminal device establishes an RRC connection with the network device.
  • the RRC connection established between the first terminal device and the network device refers to the RRC connection between the first terminal device and the network device.
  • the RRC connection between the first terminal device and the network device is a relay link of the second terminal device.
  • the first terminal device is in an idle state or an inactive state, and initiates an RRC connection establishment process to the network device, thereby entering the connected state.
  • step 401a and step 401b do not have a necessary sequence of execution, that is, step 401b can be executed before step 401a, or after step 401a, or can be executed simultaneously, which is not limited.
  • the second terminal device communicates with the network device through the first terminal device based on the first connection.
  • the second terminal device communicates with the network device through the RRC connection between the second terminal device and the network device, and the communication between the second terminal device and the network device is
  • the RRC connection is established based on the RRC connection between the first terminal device and the network device, and the PC5-S connection between the first terminal device and the second terminal device.
  • the communication between the second terminal device and the network device may include that the second terminal device sends data to the network device, and/or the second terminal device receives data from the network device.
  • the data sent by the second terminal device to the network device is forwarded by the first terminal device, and the data sent by the network device to the second terminal device is also forwarded by the first terminal device.
  • the communication between the second terminal device and the network device includes a data relay process.
  • the communication between the second terminal device and the network device may further include an authentication process of the network device for the second terminal device.
  • the authentication process performed by the network device for the second terminal device may include that the network device sends authentication signaling to the second terminal device, and the second terminal device sends reply information to the authentication signaling to the network device.
  • the authentication signaling is forwarded to the network device through the first terminal device, and the reply information to the authentication signaling is also forwarded to the network device through the first terminal device.
  • the network device sends the first message to the second terminal device, and the corresponding second terminal device receives the first message sent by the network device.
  • the first message is used to instruct the second terminal device to release the RRC connection with the network device. It should be noted that the sending of the first message by the network device to the second terminal device is an optional step, which is represented by a dotted line in FIG. 4 .
  • the network device sends the first message to the second terminal device through the first terminal device.
  • the network device may send the first message to the second terminal device before releasing the RRC connection with the second terminal device when the communication with the second terminal device ends; or, the network device may release the communication with the second terminal device.
  • the first message is sent to the second terminal device; or, the network device may send the first message to the second terminal device after releasing the RRC connection with the second terminal device.
  • the network device may also send the first message to the second terminal device when the communication with the second terminal device is not completed. It should be noted that, specifically under what circumstances the network device sends the first message to the second terminal device, this is not limited in this embodiment of the present application.
  • the first message is an RRC connection release message.
  • the network device sends an RRC connection release message to the second terminal device, and the corresponding second terminal device receives the RRC connection release message sent by the network device.
  • the second terminal device may switch from the connected state to the idle state or the inactive state after receiving the RRC connection release message.
  • the network device sends first indication information to the first terminal device.
  • the first terminal device receives the first indication message sent by the first terminal device, and the first indication information is used to indicate the relationship between the second terminal device and the network device. communication ends.
  • the first indication information may indicate that the communication between the second terminal device and the network device ends by indicating that the relay service between the second terminal device and the network device ends. That is, the first indication information is used to indicate that the relay service between the second terminal device and the network device ends.
  • the first indication information is used to indicate the end of the relay service between the second terminal device and the network device, which can be understood as: the first indication information is used to indicate that the connection between the second terminal device and the network device in the uplink direction and/or The relay service in the downlink direction ends.
  • the end of the relay service in the uplink direction between the second terminal device and the network device means that the second terminal device has no relay-related services in the uplink direction; the second terminal device and the network device relay services in the downlink direction.
  • End means that the second terminal device has no relay related services in the downlink direction; relay services between the second terminal device and the network device in both the uplink and downlink directions are terminated means that the second terminal device is in the uplink and downlink directions. There is no relay related business upwards.
  • the first indication information may indicate the end of the communication between the second terminal device and the network device by instructing the network device to end the authentication process for the second terminal device. That is, the first indication information is used to instruct the network device to end the authentication process for the second terminal device.
  • the first indication information indicates that the communication between the second terminal device and the network device ends by instructing the second terminal device to enter the inactive state or the idle state, that is, the first indication information instructs the second terminal device to enter the inactive state. or idle state.
  • the network device may carry the first indication information in an RRC message (eg, an RRC reconfiguration message) and send it to the first terminal device.
  • RRC message eg, an RRC reconfiguration message
  • the communication between the network device and the second terminal device ends, and the first indication information is sent to the first terminal device.
  • the network device may also send the first indication information to the second terminal device when the communication with the second terminal device is not completed. In the embodiment of the present application, specifically under what circumstances the network device sends the first indication information to the second terminal device, this is not limited in the embodiment of the present application.
  • the network device may determine that the communication with the second terminal device ends based on the following manner:
  • the network device determines that the communication with the second terminal device ends.
  • the network device determines that the communication with the second terminal device ends.
  • the network device determines that the communication with the second terminal device ends.
  • the network device determines that the communication with the second terminal device ends.
  • step 402 and step 403a do not have a certain order of execution, that is, step 402 can be executed before step 403a, or after step 403a, or can be executed simultaneously. This is not limited.
  • the second terminal device sends the first indication information to the first terminal device.
  • the first terminal device receives the first indication information sent by the second terminal device, and the first indication information is used to indicate the second terminal device and the network device. The communication between them ends.
  • the second terminal device may carry the first indication information in a PC5RRC message or a PC5-S message and send it to the first terminal device.
  • This embodiment of the present application does not limit the message carrying the first indication information, for example, the message carrying the first indication information may also be a newly defined message.
  • the second terminal device may send the first indication information to the first terminal device after receiving the first message.
  • the second terminal device may send the first indication information to the first terminal device, which is not limited.
  • the communication between the second terminal device and the network device ends, and the first indication information is sent to the first terminal device.
  • the second terminal device determines the end of the communication with the network device, reference may be made to the manner in which the network device determines the end of the communication with the second terminal device, and details are not described herein again.
  • the second terminal device may also not send the first indication information to the first terminal device after receiving the first message.
  • step 403a may be executed without executing step 403b, that is, the network device sends the first indication information to the first terminal device; or, only step 403b may be executed without executing step 403b.
  • Step 403a that is, the second terminal device sends the first indication information to the first terminal device.
  • the communication method when step 403a is executed and step 403b is not executed, and the communication method when step 403b is executed without step 403a are two parallel technical solutions.
  • step 403a and step 403b are executed.
  • steps 403a and 403b do not have a necessary sequence of execution, that is, step 403b can be executed before step 403a, or It may be performed after step 403a, or may be performed simultaneously, which is not limited.
  • the first terminal device determines, according to the first indication information, that the communication between the second terminal device and the network device ends.
  • the first indication information in step 404 may include the first indication information sent by the second terminal device and the first indication information sent by the network device.
  • the first indication information in step 404 refers to the first indication information sent by the network device.
  • the first indication information in step 404 refers to the first indication information sent by the second terminal device.
  • the first terminal device can receive the first indication information, so that the first terminal device can know that the communication between the network device and the second terminal device has ended, and there is no need to provide a relay service for the second terminal device , so that the first terminal device can subsequently determine whether to enter a more energy-saving RRC state, such as an idle state or an inactive state, according to its own communication situation or communication requirements.
  • a more energy-saving RRC state such as an idle state or an inactive state
  • the first terminal device sends auxiliary information to the network device, and correspondingly, the network device receives the auxiliary information sent by the first terminal device.
  • the auxiliary message is used to request to release the RRC connection between the first terminal device and the network device, so that the first terminal device can enter an idle state or an inactive state from a connected state, so as to save power consumption.
  • step 405 is an optional step, which is represented by a dotted line in FIG. 4 .
  • the first terminal device may determine the connection between the second terminal device and the network device according to the first indication information.
  • the communication ends for example, the relay service between the second terminal device and the network device ends, or the authentication process of the network device for the second terminal device ends, etc.
  • the auxiliary information is not sent to the network device according to the first indication information.
  • the first terminal device may not read the first indication information.
  • the first terminal device directly sends auxiliary information requesting to release the RRC connection between the first terminal device and the network device to the network device without considering the influence of other factors.
  • the first terminal device after receiving the first indication information, the first terminal device considers the influence of other factors (such as remaining battery power, other business conditions, etc.), and determines whether to send a request to the network device for the release of the first terminal device and the network device. Auxiliary message for RRC connection between.
  • the first terminal device determines whether to send auxiliary information to the network device according to the received first indication information and whether the first terminal device and the network device have a communication requirement.
  • the fact that the first terminal device has no communication requirement with the network device may include that the upstream buffer data of the first terminal device is zero, or the first terminal device has not received scheduling from the network device for a period of time.
  • the first terminal device will not send a request to the network device to release the first indication information even if it receives the first indication information.
  • the communication method shown in FIG. 4 can also be applied to a scenario in which the first connection is only used for the communication between the second terminal device and the network device, such as the above scenario 2.
  • Embodiment 2 The second terminal device needs to perform a relay service through the first terminal device and the network device.
  • FIG. 5 it is a schematic flowchart of a communication method according to an embodiment of the present application, which specifically includes the following steps.
  • the first terminal device establishes a first connection with the second terminal device.
  • the first connection is used for the communication between the second terminal device and the network device, or the first connection is only used for the communication between the second terminal device and the network device.
  • the second terminal device cannot communicate with the first terminal device through the first connection.
  • the first connection is a PC5-S connection, or other connections, such as a PC5-RRC connection.
  • the second terminal device and the network device perform relay services based on the first connection.
  • the first terminal device and the second terminal device Before establishing the PC5-S connection, optionally, the first terminal device and the second terminal device perform a device discovery process, so that the first terminal device discovers the second terminal device, and/or the second terminal device discovers the first terminal device. Alternatively, when the first terminal device has discovered the second terminal device, and/or the second terminal device has discovered the first terminal device, it is not necessary to repeat the device discovery process before establishing the PC5-S connection.
  • step 401a Regarding the device discovery process and the process of establishing the PC5-S connection, reference may be made to the relevant introduction in step 401a, and details are not repeated here.
  • the first terminal device establishes an RRC connection with the network device.
  • the RRC connection established between the first terminal device and the network device refers to the RRC connection between the first terminal device and the network device.
  • the first terminal device is in an idle state or an inactive state, and initiates an RRC connection establishment process to the network device, thereby entering the connected state.
  • step 501b may be executed before step 501a, may be executed after step 501a, or may be executed simultaneously, which is not limited.
  • the second terminal device Based on the first connection, the second terminal device communicates with the network device through the first terminal device.
  • the second terminal device communicates with the network device through the RRC connection between the second terminal device and the network device, and the communication between the second terminal device and the network device is
  • the RRC connection is established based on the RRC connection between the first terminal device and the network device, and the PC5-S connection between the first terminal device and the second terminal device.
  • the procedure for establishing an RRC connection between the second terminal device and the network device may include the following steps:
  • the second terminal device sends an RRC connection establishment request to the network device, where the RRC connection establishment request is used to request to establish an RRC connection.
  • the second terminal device sends the RRC connection establishment request sent to the network device to the first terminal device through the PC5-S connection, and the first terminal device receives the RRC connection establishment request from the second terminal device, through the connection with the network device. and forward the RRC connection establishment request of the second terminal device to the network device.
  • the network device After receiving the RRC connection establishment request from the second terminal device, the network device replies with a response message to the second terminal device, thereby completing the establishment of the RRC connection between the second terminal device and the network device.
  • the communication between the second terminal device and the network device may include that the second terminal device sends data to the network device, and/or the second terminal device receives data from the network device.
  • the data sent by the second terminal device to the network device is forwarded by the first terminal device, and the data sent by the network device to the second terminal device is also forwarded by the first terminal device.
  • the communication between the second terminal device and the network device may include a data relay process.
  • the communication between the second terminal device and the network device may include that the second terminal device receives control signaling from the network device, and/or the second terminal device sends a reply message to the control signaling to the network device.
  • the control signaling sent by the network device to the second terminal device is also forwarded by the first terminal device, and the reply message to the control signaling sent by the second terminal device to the network device is forwarded by the first terminal device.
  • the control signaling sent by the network device to the second terminal device and/or the reply message to the control signaling sent by the second terminal device to the network device can be understood as the transmission of relay signaling.
  • the relay signaling may include an RRC message, such as an RRC reconfiguration message, an RRC reconfiguration complete message, and the like. This is just an example, and the relay signaling is not limited.
  • the communication between the second terminal device and the network device may also include a signaling relay process.
  • the second terminal device sends auxiliary information to the network device.
  • the network device receives the auxiliary information sent by the second terminal device, where the auxiliary message is used to request the network device to release the RRC connection with the second terminal device.
  • step 502a is an optional step, which is represented by a dotted line in FIG. 5 , that is, the second terminal device may not send auxiliary information to the network device.
  • the auxiliary message is used to request to release the RRC connection between the second terminal device and the network device, so that the second terminal device can enter the idle state or the inactive state from the connected state, which helps the first terminal device to save energy in the future. power consumption.
  • the second terminal device when the second terminal device does not continuously send uplink data to the network device for a certain period of time, the second terminal device sends the auxiliary information to the network device.
  • the second terminal device may also send auxiliary information to the network device when the network signal strength is continuously lower than a certain threshold for a certain period of time. It should be noted that the specific circumstances under which the second terminal device sends auxiliary information to the network device is not limited.
  • the network device sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device. It should be noted that the sending of the first message by the network device to the second terminal device is an optional step, which is represented by a dotted line in FIG. 5 .
  • the network device sends the first message to the second terminal device through the first terminal device.
  • the network device may send the first message to the second terminal device according to the auxiliary information.
  • the network device may end the communication with the second terminal device and send the first message to the second terminal device before releasing the RRC connection with the second terminal device; or, the network device may release the connection with the second terminal device.
  • the RRC connection is established between the two terminal devices, the first message is sent to the second terminal device; or, the network device may send the first message to the second terminal device after releasing the RRC connection with the second terminal device.
  • the network device determines that the communication with the second terminal device ends by other means, which is not limited.
  • the network device may also not send the first message to the second terminal device after receiving the auxiliary information from the second terminal device.
  • the first message is an RRC connection release message.
  • the network device sends an RRC connection release message to the second terminal device, and the corresponding second terminal device receives the RRC connection release message sent by the network device.
  • the second terminal device may switch from the connected state to the idle state or the inactive state after receiving the RRC connection release message.
  • the second terminal device sends first indication information to the first terminal device.
  • the first terminal device receives the first indication message sent by the second terminal device, and the first indication information is used to indicate the second terminal device and the network device. The communication between them ends.
  • the second terminal device may send the first indication information to the first terminal device after receiving the first message.
  • steps 502a and 503a do not have a certain order of execution, and the second terminal device may first send the auxiliary information to the network device, and then send the first terminal device to the first terminal device.
  • the auxiliary information and the first indication information may also be sent at the same time, or the first indication information is first sent to the first terminal device, and then the auxiliary information is sent to the network device, which is not limited.
  • the second terminal device may send the first indication information to the first terminal device after receiving the first message.
  • the communication between the second terminal device and the network device ends, and the first indication information is sent to the first terminal device.
  • the first terminal device For example, when there is no relay service between the second terminal device and the network device, it is determined that the communication between the second terminal device and the network device ends.
  • the second terminal device enters an idle state or an inactive state, it is determined that the communication between the second terminal device and the network device ends.
  • the second terminal device sends the first indication information to the first terminal device, this is not limited in this embodiment of the present application.
  • the second terminal device to send the first indication information to the first terminal device reference may be made to the relevant introduction in step 403b.
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device. Specifically, when the second terminal device enters the idle state or the inactive state, if the downlink data of the second terminal device arrives, the network device will send a paging message to the second terminal device at the agreed PO to page the first terminal device. Two terminal devices, and the second terminal device receives the paging message sent by the network device through the first terminal device.
  • the first terminal device needs to monitor the paging message of the second terminal device on the PO agreed between the network device and the second terminal device after the second terminal device enters the idle state or the inactive state, so as to reduce the risk of the second terminal device.
  • the possibility of omitting the paging of the second terminal device by the network device when entering the idle state or the inactive state is helpful to save the power consumption of the second terminal device.
  • the first terminal device can also monitor the paging of the second terminal device on the PO agreed between the network device and the second terminal device information.
  • the first indication information may indicate the end of the communication between the second terminal device and the network device by instructing the second terminal device to enter an inactive state or an idle state, that is, the first indication information is used to instruct the second terminal device Enter inactive or idle state.
  • the second terminal device may carry the first indication information in a PC5RRC message or a PC5-S message and send it to the first terminal device.
  • This embodiment of the present application does not limit the message carrying the first indication information, for example, the message carrying the first indication information may also be a newly defined message.
  • the network device sends first indication information to the first terminal device.
  • the first terminal device receives the first indication message sent by the network device, and the first indication information is used to indicate the communication between the second terminal device and the network device. Finish.
  • the network device may send the first indication information to the first terminal device after receiving the assistance message sent by the second terminal device.
  • the communication between the network device and the second terminal device ends, and the first indication information is sent to the first terminal device.
  • the network device determines that the communication with the second terminal device ends.
  • the network device may also use other methods, for example, after the network device releases the RRC connection with the second terminal device, it is determined that the communication with the second terminal device ends, which is not limited in this embodiment of the present application.
  • the network device may also not send the first indication information to the first terminal device after receiving the assistance message sent by the second terminal device. It should be noted that under what circumstances the network device sends the first indication information to the first terminal device, which is not limited.
  • step 503b and step 502b do not have a certain sequence of execution, that is, step 503b can be executed before step 503b, or after step 503, or can be executed simultaneously, which is not limited .
  • step 503a in the communication method shown in FIG. 5, only step 503a may be performed, and step 503b may not be performed, that is, the second terminal device sends the first indication information to the first terminal device; or, only step 503b may be performed, Step 503a is not executed, that is, the network device sends the first indication information to the first terminal device.
  • the communication method when step 503a is executed and step 503b is not executed, and the communication method when step 503b is executed without step 503a are two parallel technical solutions.
  • both steps 503a and 503b are performed, that is, both the second terminal device and the network device send the first indication information to the first terminal device.
  • steps 503a and 503b do not have a necessary order of execution, that is, step 503b can be executed before step 503a, or after step 503a, or can be executed simultaneously, which is not limited. .
  • steps 503a or 503b are performed.
  • the first terminal device determines, according to the first indication information, that the communication between the second terminal device and the network device has ended or that it needs to monitor the paging of the second terminal device.
  • the first indication information in step 504 may include the first indication information sent by the second terminal device and the first indication information sent by the network device.
  • the first indication information in step 504 refers to the first indication information sent by the second terminal device.
  • the first indication information in step 504 refers to the first indication information sent by the network device.
  • the first terminal device can receive the first indication information, so that the first terminal device can know that the communication between the network device and the second terminal device has ended, and whether it needs to monitor the paging of the second terminal device , so that the first terminal device can subsequently determine whether to enter a more energy-saving RRC state, such as an idle state or an inactive state, according to its own communication situation or communication requirements.
  • a more energy-saving RRC state such as an idle state or an inactive state
  • the first terminal device sends auxiliary information to the network device, and accordingly, the network device receives the auxiliary information sent by the first terminal device.
  • the auxiliary message can be used to request to release the RRC connection between the first terminal device and the network device, so that the first terminal device can enter an idle state or an inactive state from a connected state, so as to save power consumption.
  • step 505 is an optional step, which is represented by a dotted line in FIG. 5 .
  • step 504 when the first terminal device determines that the communication between the second terminal device and the network device ends according to the first indication information, for the introduction of the auxiliary message in step 505, please refer to the relevant introduction to the auxiliary message in step 405.
  • step 504 when the first terminal device determines, according to the first indication information, that it needs to monitor the paging of the second terminal device, for example, the first terminal device may be in an active state at the paging occasion of the second terminal device to The possibility of missing a page by the network device for the second terminal device is reduced.
  • the methods provided by the embodiments of the present application are respectively introduced from the perspective of interaction between a network device and a terminal device.
  • the base station and the terminal device may include hardware structures and/or software modules, and implement the above functions in the form of hardware structures, software modules, or hardware structures plus software modules. Whether one of the above functions is performed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • FIG. 6 shows a communication device 600 provided by the present application, including a transceiver module 620 and a processing module 610 .
  • the communication apparatus 600 may be a first terminal device, or may be a device capable of supporting the first terminal device to implement the functions of the first terminal device in the methods involved in FIGS. 4 and 5 .
  • the communication apparatus 600 may also be an apparatus (eg, a chip or a chip system) in the first terminal device.
  • the chip system may be composed of chips, and may also include chips and other discrete devices.
  • the processing module 610 is used to establish a PC5-S connection with the second terminal device; the PC5-S connection is used for the second terminal device to communicate with the communication apparatus 600, and the PC5-S connection is used for the second terminal device
  • the terminal device communicates with the network device; the transceiver module 620 is configured to receive first indication information, where the first indication information is used to instruct the end of the communication between the second terminal device and the network device.
  • the transceiver module 620 is further configured to send auxiliary information to the network device after receiving the first indication information, where the auxiliary information is used to request to release the RRC connection between the communication apparatus 600 and the network device.
  • the first indication information is used to instruct the end of the relay service between the second terminal device and the network device; or, the first indication information is used to instruct the network device to end the authentication process for the second terminal device; Alternatively, the first indication information is used to instruct the second terminal device to enter an inactive state; or, the first indication information is used to instruct the second terminal device to enter an idle state.
  • the transceiver module 620 is specifically configured to receive the first indication information from the second terminal device; and/or, receive the first indication information from the network device.
  • the processing module 610 is used to establish a PC5-S connection with the second terminal device; the PC5-S connection is used for the second terminal device to communicate with the network device; the transceiver module 620 is used to receive the first Indication information, the first indication information is used to instruct the end of the communication between the second terminal device and the network device, or the first indication information is used to instruct the communication apparatus 600 to monitor the PO of the second terminal device.
  • the transceiver module 620 is further configured to send auxiliary information to the network device after receiving the first indication information, where the auxiliary information is used to request to release the RRC connection between the communication apparatus 600 and the network device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive state; or, the first indication information is used to instruct the second terminal device to enter an idle state; or, the first indication information is used to instruct the first terminal device to enter an idle state.
  • a terminal device monitors the PO of the second terminal device.
  • the transceiver module 620 is specifically configured to: receive the first indication information from the second terminal device; and/or receive the first indication information from the network device.
  • the communication apparatus 600 may be a second terminal device, or may be a device capable of supporting the second terminal device to implement the functions of the second terminal device in the methods involved in FIGS. 4 and 5 .
  • the communication apparatus 600 may also be an apparatus (eg, a chip or a chip system) in the second terminal device.
  • the chip system may be composed of chips, and may also include chips and other discrete devices.
  • the processing module 610 is configured to establish a PC5-S connection with the first terminal device, the PC5-S connection is used for the communication apparatus 600 to communicate with the first terminal device, and the PC5-S connection is used for communication The apparatus 600 communicates with the network device;
  • the transceiver module 620 is configured to end the communication with the network device, and send first indication information to the first terminal device, where the first indication information is used to instruct the communication apparatus 600 to end the communication with the network device.
  • the first indication information is used to instruct the end of the relay service between the communication apparatus 600 and the network device; or, the first indication information is used to instruct the network device to end the authentication process for the communication apparatus 600; or, The first indication information is used to instruct the communication apparatus 600 to enter an inactive state; or, the first indication information is used to instruct the communication apparatus 600 to enter an idle state.
  • the transceiver module 620 is further configured to receive a first message from the network device, where the first message is used to instruct the communication apparatus 600 to release the RRC connection with the network device.
  • the processing module 610 is used to establish a PC5-S connection with the first terminal device, and the PC5-S connection is used for the communication device 600 to communicate with the network device; the transceiver module 620 is used to communicate with the network device After the communication ends, send first indication information to the first terminal device, where the first indication information is used to instruct the communication apparatus 600 to end the communication with the network device, or the first indication information is used to instruct the first terminal apparatus to monitor the PO of the communication apparatus 600 .
  • the first indication information is used to instruct the second terminal device to enter an inactive state; or, the first indication information is used to instruct the second terminal device to enter an idle state; or, the first indication information is used to instruct the first terminal device to enter an idle state.
  • a terminal device monitors the PO of the second terminal device.
  • the transceiver module 620 is further configured to receive a first message sent by the network device, where the first message is used to instruct the communication apparatus 600 to release the RRC connection with the network device.
  • the communication apparatus 600 may be a network device, or may be a device capable of supporting the network device to implement the functions of the network device in the methods involved in FIGS. 4 and 5 .
  • the communication apparatus 600 may also be an apparatus (such as a chip or a chip system) within a network device.
  • the chip system may be composed of chips, and may also include chips and other discrete devices.
  • the transceiver module 620 is configured to communicate with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device, and the PC5-S connection is used for the first terminal device to communicate with the second terminal device.
  • the processing module 610 is configured to trigger the transceiver module 620 to send the first indication information to the first terminal equipment when the communication between the transceiver module 620 and the second terminal equipment ends, and the first indication information is used to indicate the communication between the second terminal equipment and the communication apparatus 600. Finish.
  • the first indication information is used to instruct the end of the relay service between the second terminal device and the communication apparatus 600; or, the first indication information is used to instruct the communication apparatus 600 to perform an authentication process for the second terminal apparatus end; or, the first indication information is used to instruct the second terminal device to enter an inactive state; or, the first indication information is used to instruct the second terminal device to enter an idle state.
  • the transceiver module 620 is further configured to receive an auxiliary message sent by the first terminal device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus 600 .
  • the transceiver module 620 is further configured to send a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the communication apparatus 600 .
  • the transceiver module 620 is configured to communicate with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device;
  • the processing module 610 is used for the end of the communication between the transceiver module 620 and the second terminal device, and triggers the transceiver module 620 to send first indication information to the first terminal device, where the first indication information is used to indicate the communication between the second terminal device and the communication apparatus 600 End, or, the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • the first indication information is used to instruct the second terminal device to enter an inactive state; or, the first indication information is used to instruct the second terminal device to enter an idle state; or, the first indication information is used to instruct the first terminal device to enter an idle state.
  • a terminal device monitors the PO of the second terminal device.
  • the transceiver module 620 is further configured to receive an auxiliary message sent by the first terminal device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus 600 .
  • the transceiver module 620 is further configured to send a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the communication apparatus 600 .
  • the processing module 610 and the transceiver module 620 For the specific execution process of the processing module 610 and the transceiver module 620, reference may be made to the descriptions in the above method embodiments.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
  • an embodiment of the present application further provides a communication apparatus 700 .
  • the communication apparatus 700 is configured to implement the function of the first terminal device in the methods involved in FIG. 4 and FIG. 5 , and the apparatus may be the first terminal device, or may be an apparatus in the first terminal device.
  • the communication apparatus 700 includes at least one processor 77 for implementing the function of the first terminal device in the above method.
  • the processor 710 may be configured to establish a PC5-S connection with the second terminal device.
  • the communication apparatus 700 is configured to implement the functions of the second terminal device in the methods involved in FIG. 4 and FIG. 5 , and the apparatus may be the second terminal device, or may be an apparatus in the second terminal device.
  • the communication apparatus 700 includes at least one processor 710 for implementing the function of the second terminal device in the above method.
  • the processor 710 may be configured to establish a PC5-S connection with the first terminal device.
  • the communication apparatus 700 is used to implement the functions of the network device in the methods involved in FIG. 4 and FIG. 5 , and the apparatus may be a network device or an apparatus in a network device.
  • the communication apparatus 700 includes at least one processor 710 for implementing the functions of the network device in the above method.
  • the processor 710 may be configured to end the communication with the second terminal device, and trigger the sending of the first indication information.
  • the communication apparatus 700 includes at least one processor 710 for implementing the functions of the network device in the above method.
  • the processor 710 may be configured to end the communication with the second terminal device, and trigger the sending of the first indication information.
  • the communication apparatus 700 may also include at least one memory 720 for storing computer programs or instructions.
  • Memory 720 is coupled to processor 710 .
  • the coupling in the embodiments of the present application is the spaced coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between the devices, units or modules.
  • the memory 720 may also be located outside the communication device 700 .
  • the processor 710 may cooperate with the memory 720 .
  • the processor 710 may execute computer programs stored in the memory 720 . At least one of the at least one memory may be included in the processor.
  • the communication apparatus 700 may further include a communication interface 730 for communicating with other devices through a transmission medium, so that the devices used in the communication apparatus 700 may communicate with other devices.
  • the communication interface 730 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a terminal device or a network device.
  • the processor 710 uses the communication interface 730 to send and receive messages (first messages, etc.), and is used to implement the methods in the above embodiments.
  • the communication interface 730 may be used to receive the first indication information.
  • the embodiment of the present application does not limit the connection medium between the communication interface 730 , the processor 710 , and the memory 720 .
  • the memory 720 , the processor 710 , and the communication interface 730 may be connected by a bus, and the bus may be divided into an address bus, a data bus, a control bus, and the like.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can implement or
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), for example Random-access memory (RAM).
  • Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and/or data.
  • the communication apparatus 600 and the communication apparatus 700 can be implemented by using the following circuits or devices: one or more Field programmable gate array (FPGA), programmable logic device (PLD), controller, state machine, gate logic, discrete hardware components, any other suitable circuit, or capable of carrying out the present application Any combination of circuits for the various functions described throughout.
  • FPGA Field programmable gate array
  • PLD programmable logic device
  • state machine state machine
  • gate logic discrete hardware components
  • the methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented in software, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable apparatus.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server or data center by wire (eg coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available media that can be accessed by a computer, or a data storage device such as a server, data center, etc. that includes one or more available media integrated.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, digital video discs (DVD)), or semiconductor media (eg, SSDs), and the like.
  • Embodiment 1 a communication method, comprising:
  • the first terminal device establishes a PC5-S connection with the second terminal device;
  • the PC5-S connection is used for the second terminal device to communicate with the first terminal device, and the PC5-S connection is used for the second terminal device communicates with the network device;
  • the first terminal device receives first indication information, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 2 The method according to Embodiment 1, further comprising:
  • the first terminal device After receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device.
  • Embodiment 3 The method according to Embodiment 1 or 2, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • the first terminal device receives the first indication information, including:
  • the first terminal device receives the first indication information from the second terminal device; and/or,
  • the first terminal device receives the first indication information from the network device.
  • Embodiment 5 a communication method, comprising:
  • the second terminal device establishes a PC5-S connection with the first terminal device, the PC5-S connection is used for the second terminal device to communicate with the first terminal device, and the PC5-S connection is used for the second terminal device communicates with the network device;
  • the communication between the second terminal device and the network device ends;
  • the second terminal device sends first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 6 The method according to Embodiment 5, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 7 the method according to embodiment 5 or 6, further comprising:
  • the second terminal device receives a first message from the network device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device.
  • Embodiment 8 a communication method, comprising:
  • the network device communicates with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device, and the PC5-S connection is used for the first terminal device and the second terminal device communication;
  • the communication between the network device and the second terminal device ends;
  • the network device sends first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 9 The method according to Embodiment 8, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 10 The method according to Embodiment 8 or 9, further comprising:
  • the network device receives an auxiliary message sent by the first terminal device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device.
  • Embodiment 11 The method according to any one of Embodiments 8 to 10, further comprising:
  • the network device sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device.
  • Embodiment 12 a communication method, comprising:
  • the first terminal device establishes a PC5-S connection with the second terminal device; the PC5-S connection is used for the second terminal device to communicate with the network device;
  • the first terminal device receives first indication information, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 13 The method according to Embodiment 12, further comprising:
  • the first terminal device After receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device; or ,
  • the first terminal device After receiving the first indication information, the first terminal device monitors the paging occasion PO of the second terminal device.
  • Embodiment 14 The method according to Embodiment 12 or 13, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • the first terminal device receives the first indication information, including:
  • the first terminal device receives the first indication information from the second terminal device; and/or,
  • the first terminal device receives the first indication information from the network device.
  • Embodiment 16 a communication method, comprising:
  • the second terminal device establishes a PC5-S connection with the first terminal device, and the PC5-S connection is used for the communication between the second terminal device and the network device;
  • the communication between the second terminal device and the network device ends;
  • the second terminal device sends first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 17 The method according to Embodiment 16, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • Embodiment 18 The method according to Embodiment 16 or 17, further comprising:
  • the second terminal device receives a first message sent by the network device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device.
  • Embodiment 19 a communication method, comprising:
  • the network device communicates with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device;
  • the communication between the network device and the second terminal device ends;
  • the network device sends first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 20 The method according to Embodiment 19, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the paging occasion PO of the second terminal device.
  • Embodiment 21 The method according to Embodiment 19 or 20, further comprising:
  • the network device receives an auxiliary message sent by the first terminal device, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the network device.
  • Embodiment 22 The method of any one of Embodiments 19 to 21, further comprising:
  • the network device sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection with the network device.
  • a communication device may be a first terminal device or a chip or a system on a chip in the first terminal device, the communication device includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer The programs or instructions, when executed by the processor, cause the communication device to perform the following steps:
  • a PC5-S connection is established with the second terminal device; the PC5-S connection is used for the second terminal device to communicate with the communication device, and the PC5-S connection is used for the second terminal device communicate with network devices;
  • Receive first indication information where the first indication information is used to instruct the end of the communication between the second terminal device and the network device.
  • Embodiment 24 According to the communication device of Embodiment 23, when the computer program or the instruction is executed by the processor, the communication device is caused to further perform the following steps:
  • auxiliary information After receiving the first indication information, send auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the communication apparatus and the network device.
  • Embodiment 25 The communication apparatus according to Embodiment 23 or 24, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 26 The communication apparatus according to any one of Embodiments 23 to 25, wherein the receiving the first indication information includes:
  • the first indication information from the network device is received.
  • Embodiment 27 A communication device, the communication device may be a second terminal device or a chip or a system-on-chip in the second terminal device, the communication device includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer The programs or instructions, when executed by the processor, cause the communication device to perform the following steps:
  • the PC5-S connection is used for the communication device to communicate with the first terminal device, and the PC5-S connection is used for the communication device to communicate with the network device communication;
  • Embodiment 28 The communication apparatus according to Embodiment 27, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 29 According to the communication device of Embodiment 27 or 28, when the computer program or the instruction is executed by the processor, the communication device is caused to perform the following steps:
  • a first message from the network device is received, where the first message is used to instruct the second terminal device to release the RRC connection with the network device.
  • Embodiment 30 A communication device, the communication device may be a network device or a chip or a system-on-chip in the network device, the communication device includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer program or instruction is When the processor is executed, the communication device is caused to perform the following steps:
  • the communication with the second terminal device ends;
  • Embodiment 31 The communication apparatus according to Embodiment 30, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 32 According to the communication device of Embodiment 30 or 31, when the computer program or the instruction is executed by the processor, the communication device is caused to perform the following steps:
  • auxiliary message sent by the first terminal device is received, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus.
  • Embodiment 33 The communication device according to any one of Embodiments 30 to 32, when the computer program or instruction is executed by the processor, the communication device is caused to perform the following steps:
  • Embodiment 34 A communication device, the communication device may be a first terminal device or a chip or a system-on-chip in the first terminal device, the communication device includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer The programs or instructions, when executed by the processor, cause the communication device to perform the following steps:
  • the PC5-S connection is used for the communication between the second terminal device and the network device;
  • Receive first indication information where the first indication information is used to instruct the end of the communication between the second terminal device and the network device.
  • Embodiment 35 The communication apparatus according to Embodiment 34, when the computer program or the instructions are executed by the processor, the communication apparatus is caused to perform the following steps:
  • auxiliary information After receiving the first indication information, send auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the communication apparatus and the network device; or,
  • Embodiment 36 The communication apparatus according to Embodiment 34 or 35, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • Embodiment 37 The communication apparatus according to any one of Embodiments 34 to 36, wherein the receiving the first indication information includes:
  • the first indication information from the communication device is received.
  • Embodiment 38 a communication apparatus
  • the communication apparatus may be a second terminal device or a chip or a system-on-chip in the second terminal device
  • the communication apparatus includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer
  • PC5-S connection establishing a PC5-S connection with the first terminal device, and the PC5-S connection is used for the communication device to communicate with the network device;
  • Embodiment 39 The communication apparatus according to Embodiment 38, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • Embodiment 40 According to the communication device of Embodiment 38 or 39, when the computer program or instruction is executed by the processor, the communication device is caused to further perform the following steps:
  • a first message sent by the network device is received, where the first message is used to instruct the communication apparatus to release the RRC connection with the network device.
  • Embodiment 41 A communication apparatus, the communication apparatus may be a network device or a chip or a system-on-chip in the network device, the communication apparatus includes: a processor and a memory, and the memory stores a computer program or instruction, when the computer program or instruction is When the processor is executed, the communication device is caused to perform the following steps:
  • the communication with the second terminal device ends;
  • Embodiment 42 The communication apparatus according to Embodiment 41, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the paging occasion PO of the second terminal device.
  • Embodiment 43 According to the communication apparatus according to Embodiment 40 or 42, when the computer program or instruction is executed by the processor, the communication apparatus is caused to further perform the following steps:
  • auxiliary message sent by the first terminal device is received, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus.
  • Embodiment 44 The communication device according to any one of Embodiments 41 to 43, when the computer program or instruction is executed by the processor, the communication device is caused to further perform the following steps:
  • Embodiment 45 a communication device, comprising a processing module and a transceiver module;
  • the processing module is used to establish a PC5-S connection with the second terminal device;
  • the PC5-S connection is used for the communication between the second terminal device and the communication device, and the PC5-S connection is used for communicating with the network device at the second terminal device;
  • the transceiver module is configured to receive first indication information, where the first indication information is used to instruct the end of the communication between the second terminal device and the network device.
  • Embodiment 46 The communication device according to Embodiment 45, wherein the transceiver module is further configured to:
  • auxiliary information After receiving the first indication information, send auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the communication apparatus and the network device.
  • Embodiment 47 The communication apparatus according to Embodiment 45 or 46, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 48 The communication device according to any one of Embodiments 45 to 47, wherein the transceiver module, configured to receive the first indication information, specifically includes:
  • the transceiver module is configured to: receive the first indication information from the second terminal device, and/or receive the first indication information from the network device.
  • Embodiment 49 a communication device, comprising: a processing module and a transceiver module;
  • the processing module is used to establish a PC5-S connection with the first terminal device, the PC5-S connection is used for the communication device to communicate with the first terminal device, and the PC5-S connection is used for communicating with the network device at the communication device;
  • Embodiment 50 The communication apparatus according to Embodiment 49, wherein the first indication information is used to indicate that the communication between the communication apparatus and the network device ends, comprising:
  • the first indication information is used to indicate that the relay service between the communication apparatus and the network device ends; or,
  • the first indication information is used to indicate that the authentication procedure of the network device for the communication apparatus ends; or,
  • the first indication information is used to instruct the communication device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the communication device to enter an idle state.
  • Embodiment 51 The communication device according to Embodiment 49 or 50, wherein the transceiver module is further configured to:
  • a first message from the network device is received, where the first message is used to instruct the communication apparatus to release the RRC connection with the network device.
  • Embodiment 52 a communication device, comprising: a processing module and a transceiver module;
  • the transceiver module is used to communicate with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device, and the PC5-S connection is used for the first terminal device to communicate with the second terminal device. communicating with the second terminal device;
  • the processing module is configured to end the communication between the transceiver module and the second terminal device, and trigger the transceiver module to send first indication information to the first terminal device, where the first indication information is used to indicate the The communication between the second terminal device and the communication device ends.
  • Embodiment 53 The communication apparatus according to Embodiment 52, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to indicate that the relay service between the second terminal device and the communication apparatus ends; or,
  • the first indication information is used to instruct the communication apparatus to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 54 The communication device according to Embodiment 52 or 53, wherein the transceiver module is further configured to:
  • auxiliary message sent by the first terminal device is received, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus.
  • Embodiment 55 The communication device according to any one of Embodiments 52 to 54, wherein the transceiver module is further configured to:
  • Embodiment 56 a communication device, comprising: a processing module and a transceiver module;
  • the processing module is used to establish a PC5-S connection with the second terminal device;
  • the PC5-S connection is used for the communication between the second terminal device and the network device;
  • the transceiver module is configured to receive first indication information, where the first indication information is used to instruct the end of the communication between the second terminal device and the network device.
  • Embodiment 57 The communication device according to Embodiment 56, wherein the transceiver module is further configured to:
  • auxiliary information After receiving the first indication information, send auxiliary information to the network device, where the auxiliary information is used to request to release the RRC connection between the communication apparatus and the network device; or,
  • Embodiment 58 The communication apparatus according to Embodiment 56 or 57, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • Embodiment 59 The communication device according to any one of Embodiments 56 to 58, wherein the transceiver module, configured to receive the first indication information, specifically includes:
  • the transceiver module is configured to receive the first indication information from the second terminal device, and/or receive the first indication information from the network device.
  • Embodiment 60 a communication device, comprising a processing module and a transceiver module;
  • the processing module is used to establish a PC5-S connection with the first terminal device, and the PC5-S connection is used for the communication device to communicate with the network device;
  • the transceiver module is configured to end the communication with the network device, and send first indication information to the first terminal device, where the first indication information is used to instruct the communication apparatus to end the communication with the network device.
  • Embodiment 61 The communication apparatus according to Embodiment 60, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, comprising:
  • the first indication information is used to instruct the communication device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the communication device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the communication apparatus.
  • Embodiment 62 The communication device according to Embodiment 60 or 61, wherein the transceiver module is further configured to:
  • a first message sent by the network device is received, where the first message is used to instruct the communication apparatus to release the RRC connection with the network device.
  • Embodiment 63 a communication device, comprising: a processing module and a transceiver module;
  • the transceiver module is configured to communicate with the second terminal device through the PC5-S connection between the first terminal device and the second terminal device;
  • the processing module is configured to end the communication between the transceiver module and the second terminal device, and trigger the transceiver module to send first indication information to the first terminal device, where the first indication information is used to indicate the The communication between the second terminal device and the communication device ends.
  • Embodiment 64 The communication apparatus according to Embodiment 63, wherein the first indication information is used to indicate that the communication between the second terminal device and the communication apparatus ends, comprising:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the paging occasion PO of the second terminal device.
  • Embodiment 65 The communication device according to Embodiment 63 or 64, wherein the transceiver module is further configured to:
  • auxiliary message sent by the first terminal device is received, where the auxiliary information is used to request to release the RRC connection between the first terminal device and the communication apparatus.
  • Embodiment 66 The communication device according to any one of Embodiments 63 to 65, wherein the transceiver module is further configured to:
  • Embodiment 67 A communication system, comprising: a first terminal device, a second terminal device, and a network device;
  • the first terminal device and the second terminal device establish a PC5-S connection;
  • the PC5-S connection is the PC5-S connection between the first terminal device and the second terminal device, used for all the second terminal device communicates with the first terminal device;
  • the network device and the second terminal device communicate through the PC5-S connection;
  • the network device and/or the second terminal device sends first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends.
  • Embodiment 68 The communication system according to Embodiment 67, after receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the first indication information.
  • Embodiment 69 The communication system according to Embodiment 66 or 67, wherein the network device further sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection between the network devices described above.
  • Embodiment 70 The communication system according to any one of Embodiments 66 to 69, before the network device and/or the second terminal device sends the first indication information to the first terminal device, the network device communicates with the first terminal device. The communication of the second terminal device ends.
  • Embodiment 71 The communication system according to any one of Embodiments 66 to 70, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to indicate that the relay service between the second terminal device and the network device ends; or,
  • the first indication information is used to instruct the network device to end the authentication process for the second terminal device; or,
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state.
  • Embodiment 72 A communication system, comprising: a first terminal device, a second terminal device, and a network device;
  • the PC5-S connection is a PC5-S connection between the first terminal device and the second terminal device;
  • the network device and the second terminal device communicate through the PC5-S connection;
  • the network device and/or the second terminal device send first indication information to the first terminal device, where the first indication information is used to indicate that the communication between the second terminal device and the network device ends, In other words, the first indication information is used to indicate that the first terminal device monitors the PO of the second terminal device.
  • Embodiment 73 The communication system according to Embodiment 72, after receiving the first indication information, the first terminal device sends auxiliary information to the network device, where the auxiliary information is used to request to release the first indication information.
  • auxiliary information is used to request to release the first indication information.
  • the first terminal device After receiving the first indication information, the first terminal device monitors the paging occasion PO of the second terminal device.
  • Embodiment 74 The communication system according to Embodiment 72 or 73, wherein the network device further sends a first message to the second terminal device, where the first message is used to instruct the second terminal device to release the RRC connection between the network devices described above.
  • Embodiment 75 The communication system according to any one of Embodiments 72 to 74, before the network device and/or the second terminal device send the first indication information to the first terminal device, the network device and/or the second terminal device send the first indication information to the first terminal device.
  • the communication of the second terminal device ends.
  • Embodiment 76 The communication system according to any one of Embodiments 72 to 75, wherein the first indication information is used to indicate that the communication between the second terminal device and the network device ends, including:
  • the first indication information is used to instruct the second terminal device to enter an inactive (inactive) state; or,
  • the first indication information is used to instruct the second terminal device to enter an idle (idle) state; or,
  • the first indication information is used to instruct the first terminal device to monitor the PO of the second terminal device.
  • Embodiment 76 A computer program product, when running on a computer, enables the computer to execute the method involved in any of the foregoing Embodiments 1 to 4, or to execute any of the foregoing Embodiments 5 to 7.
  • the method involved, or the method involved in any one of Embodiments 8 to 11, or the method involved in any one of Embodiments 12 to 15, or the method involved in any one of Embodiments 16 to 18, or the embodiment The method referred to in any of 19 to 22.
  • Embodiment 77 A computer-readable storage medium, storing a computer program or instruction in the computer-readable storage medium, which, when executed on a computer, enables the computer to execute any one of the foregoing Embodiments 1 to 4
  • the method involved, or the method involved in any one of the foregoing Embodiments 5 to 7, or the method involved in any of the Embodiments 8 to 11, or the method involved in any of the Embodiments 12 to 15, or the implementation of The method involved in any one of Embodiments 16 to 18, or the method involved in any one of Embodiments 19 to 22 is performed.
  • Embodiment 78 A chip including a processor.
  • the processor executes a computer program or an instruction, the processor is configured to execute the method involved in any of the foregoing Embodiments 1 to 4, or to execute the foregoing implementation.
  • the computer program or instructions can come from a memory inside the chip or from a memory outside the chip.
  • the chip further includes an input and output circuit.

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Abstract

一种通信方法及装置，涉及通信技术领域。该方法包括第一终端设备建立与第二终端设备之间的PC5-S连接。然后，第一终端设备接收第一指示信息。其中，PC5-S连接用于第二终端设备与第一终端设备通信、且PC5-S连接用于第二终端设备与网络设备通信，第一指示信息用于指示第二终端设备与网络设备的通信结束。这种技术方案使得第一终端设备可以获知第二终端设备与网络设备的通信结束。进而第一终端设备可以根据自身和/或第二终端设备的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。

Description

一种通信方法及装置
相关申请的交叉引用
本申请要求在2020年06月30日提交中国专利局、申请号为202010612830.5、申请名称为“一种提供辅助信息的方法及UE”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；本申请要求在2020年09月21日提交中国专利局、申请号为202010994524.2、申请名称为“一种通信方法及装置”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
本申请涉及通信技术领域，特别涉及一种通信方法及装置。
背景技术
侧行(sidelink，SL)通信使得终端设备和终端设备之间无需通过网络设备进行通信，从而有助于降低终端设备与终端设备之间的通信时延。例如，用户可以使用增强现实(augmented reality，AR)/虚拟现实(virtual reality，VR)眼镜观看手机中存储的视频，在这种场景下，手机是通过SL将视频发送给AR/VR眼镜，从而呈现给用户的。因此，在手机和AR/VR眼镜进行SL通信时，针对手机和AR/VR眼镜省功耗的研究，具有重要的实用价值。
发明内容
本申请提供了一种通信方法及装置，通过引入第一指示信息，在AR/VR眼镜通过手机与网络设备通信的情况下，使得手机可以获知AR/VR眼镜与网络设备的通信结束。
第一方面，为本申请实施例的一种通信方法，具体包括：第一终端设备建立与第二终端设备之间的PC5-S连接。然后，第一终端设备接收第一指示信息。其中，PC5-S连接用于第二终端设备与第一终端设备通信、且PC5-S连接用于第二终端设备与网络设备通信，第一指示信息用于指示第二终端设备与网络设备的通信结束。
基于上述技术方案，第一终端设备与第二终端设备建立PC5-S连接、且PC5-S连接用于第二终端设备与第一终端设备通信、以及用于第二终端设备与网络设备通信的情况下，能够接收第一指示信息，从而第一终端设备可以获知第二终端设备与网络设备的通信结束。进而第一终端设备可以根据自身的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，第一终端设备在接收第一指示信息后，向网络设备发送辅助信息，辅助信息用于请求释放第一终端设备与网络设备之间的RRC连接。从而有助于第一终端设备节省功耗。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备与网络设备之间的中继业务结束；或者，
第一指示信息用于指示网络设备针对第二终端设备的鉴权流程结束；或者，
第一指示信息用于指示第二终端设备进入非激活(inactive)态；或者，
第一指示信息用于指示第二终端设备进入空闲(idle)态。
通过上述技术方案，有助于简化第一指示信息的实现方式。
也就是说，在本申请实施例中，第一终端设备可以根据第一指示信息，确定第二终端设备与网络设备的通信结束，如第二终端设备与网络设备之间的中继业务结束，或者网络设备针对第二终端设备的鉴权流程结束，或者第二终端设备与网络设备之间的RRC连接断开，进入空闲态或非激活态，使得第一终端设备可以根据自身是否与网络设备有通信需求、和/或第二终端设备与网络设备是否有通信需求，判断是否请求网络设备释放与第一终端设备之间的RRC连接，以节约第一终端设备的功耗。
在一种可能的设计中，第一终端设备接收来自第二终端设备的第一指示信息；和/或，第一终端设备接收来自网络设备的第一指示信息。基于上述技术方案，使得第二终端设备和/或网络设备可以向第一终端设备发送第一指示信息，从而使得第一终端设备可以获知第二终端设备与网络设备的通信结束。
第二方面，为本申请实施例的一种通信方法，具体包括第二终端设备建立与第一终端设备之间的PC5-S连接，第二终端设备与第一终端设备通信结束，向第一终端设备发送第一指示信息。其中，PC5-S连接用于第二终端设备与所述第一终端设备通信、且PC5-S连接用于第二终端设备与网络设备通信，第一指示信息用于指示第二终端设备与网络设备的通信结束。
基于上述技术方案，使得第二终端设备可以向第一终端设备发送第一指示信息，从而使得第一终端设备能够获知第二终端设备与网络设备的通信结束，进而第一终端设备可以根据自身的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备与网络设备之间的中继业务结束；或者，
第一指示信息用于指示网络设备针对第二终端设备的鉴权流程结束；或者，
第一指示信息用于指示第二终端设备进入非激活态；或者，
第一指示信息用于指示第二终端设备进入空闲态。
通过上述技术方案，有助于简化第一指示信息的实现方式。
在一种可能的设计中，第二终端设备接收来自网络设备的第一消息，第一消息用于指示第二终端设备释放与网络设备之间的RRC连接。从而有助于使得第二终端设备可以根据第一消息，释放与网络设备之间的RRC连接。
第三方面，为本申请实施例的一种通信方法，具体包括：网络设备通过第一终端设备与第二终端设备之间的PC5-S连接，与第二终端设备通信，且PC5-S连接用于第一终端设备与第二终端设备通信。网络设备与第二终端设备的通信结束，向第一终端设备发送第一指示信息，第一指示信息用于指示第二终端设备与网络设备的通信结束。
基于上述技术方案，使得网络设备可以向第一终端设备发送第一指示信息，从而使得 第一终端设备能够获知第二终端设备与网络设备的通信结束，进而第一终端设备可以根据自身的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备与网络设备之间的中继业务结束；或者，
第一指示信息用于指示网络设备针对第二终端设备的鉴权流程结束；或者，
第一指示信息用于指示第二终端设备进入非激活态；或者，
第一指示信息用于指示第二终端设备进入空闲态。
通过上述技术方案，有助于简化第一指示信息的实现方式。
在一种可能的设计中，网络设备接收第一终端设备发送的辅助消息，辅助信息用于请求释放第一终端设备与网络设备之间的RRC连接。从而使得第一终端设备可以在第二终端设备与网络设备的通信结束后，进入空闲态，有助于第一终端设备节省功耗。
在一种可能的设计中，网络设备向第二终端设备发送第一消息，第一消息用于指示第二终端设备释放与网络设备之间的RRC连接。从而有助于使得第二终端设备根据第一消息释放与网络设备之间的RRC连接。
第四方面，为本申请实施例的另一通信方法，具体包括：第一终端设备建立与第二终端设备之间的PC5-S连接；并接收第一指示信息。其中，PC5-S连接用于第二终端设备与网络设备通信，第一指示信息用于指示第二终端设备与网络设备的通信结束、或者，第一指示信息用于指示第一终端设备监听第二终端设备的寻呼时机。
基于上述技术方案，第一终端设备与第二终端设备建立PC5-S连接、且PC5-S连接用于第二终端设备与网络设备通信的情况下，能够接收第一指示信息，从而第一终端设备可以获知第二终端设备与网络设备的通信结束、或者获知第一终端设备需要监听第二终端设备的寻呼时机，以避免第二终端设备进入空闲态或者非激活态的情况下，遗漏网络设备针对第二终端设备的寻呼。此外，第一终端设备还可以在接收到第一指示信息后，可以结合自身的通信需求、和/或第二终端设备的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，第一终端设备接收第一指示信息后，向网络设备发送辅助信息，辅助信息用于请求释放第一终端设备与所述网络设备之间的RRC连接。从而有助于节省第一终端设备功耗。
或者，在一种可能的设计中，第一终端设备接收第一指示信息后，监听第二终端设备的PO。通过上述技术方案，有助于降低第二终端设备进入空闲态或者非激活态的情况下，遗漏网络设备针对第二终端设备的寻呼的可能性。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备进入非激活态；或者，
第一指示信息用于指示第二终端设备进入空闲态；或者，
第一指示信息用于指示第一终端设备监听第二终端设备的PO。
通过上述技术方案，有助于简化第一指示信息的实现方式。
也就是说，第一终端设备可以根据第一指示信息，确定第二终端设备与网络设备的通信结束，如第二终端设备与网络设备之间的RRC连接断开，进入空闲态或非激活态，使得第一终端设备可以根据第一指示信息，判断是否监听第二终端设备的寻呼，以降低第二终端设备漏听网络设备的寻呼的可能性的。此外，第一终端也可以根据第一指示信息和第一终端的通信需求，判断是否请求网络设备释放与第一终端设备之间的RRC连接，以节约第一终端设备的功耗。
在一种可能的设计中，第一终端设备接收来自第二终端设备的第一指示信息；和/或，第一终端设备接收来自网络设备的第一指示信息。从而有助于使得第一终端设备获取第一指示信息，获知第二终端设备与网络设备的通信结束、或者需要监听第二终端设备的PO。
第五方面，为本申请实施例的另一通信方法，具体包括第二终端设备建立与第一终端设备之间的PC5-S连接，第二终端设备与网络设备通信结束，向第一终端设备发送第一指示信息。其中，PC5-S连接用于第二终端设备与网络设备通信，第一指示信息用于指示第二终端设备与网络设备的通信结束、或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
基于上述技术方案，第二终端设备可以向第一终端设备发送第一指示信息，从而使得第一终端设备可以获知第二终端设备与网络设备通信结束，或者获知第一终端设备需要监听第二终端设备的寻呼时机，以避免第二终端设备进入空闲态或者非激活态的情况下，遗漏网络设备针对第二终端设备的寻呼。此外，第一终端设备还可以在接收到第一指示信息后，可以结合自身的通信需求、和/或第二终端设备的通信需求，判断是否可以进入空闲态或非激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备进入非激活态；或者，
第一指示信息用于指示第二终端设备进入空闲态；或者，
第一指示信息用于指示第一终端设备监听第二终端设备的PO。
通过上述技术方案，有助于简化第一指示信息的实现方式。
在一种可能的设计中，第二终端设备接收网络设备发送的第一消息，第一消息用于指示第二终端设备释放与网络设备之间的RRC连接。从而有助于第二终端设备可以根据第一消息，释放与网络设备之间的RRC连接。
第六方面，为本申请实施例的另一通信方法，具体包括：网络设备通过第一终端设备与第二终端设备之间的PC5-S连接，与第二终端设备通信。网络设备与第二终端设备的通信结束，向第一终端设备发送第一指示信息，第一指示信息用于指示第二终端设备与网络设备的通信结束、或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
基于上述技术方案，网络设备可以向第一终端设备发送第一指示信息，从而使得第一终端设备可以获知第二终端设备与网络设备通信结束，或者获知第一终端设备需要监听第二终端设备的寻呼时机，以避免第二终端设备进入空闲态或者非激活态的情况下，遗漏网络设备针对第二终端设备的寻呼。此外，第一终端设备还可以在接收到第一指示信息后，可以结合自身的通信需求、和/或第二终端设备的通信需求，判断是否可以进入空闲态或非 激活态，与第一终端设备无法获知第二终端设备与网络设备的通信结束，需要一直保持激活态相比，有助于提高节省第一终端设备的功耗的可能性。
在一种可能的设计中，本申请实施例可以通过以下方式实现第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束：
第一指示信息用于指示第二终端设备进入非激活态；或者，
第一指示信息用于指示第二终端设备进入空闲态；或者，
第一指示信息用于指示第一终端设备监听第二终端设备的PO。
通过上述技术方案，有助于简化第一指示信息的实现方式。
在一种可能的设计中，网络设备接收第一终端设备发送的辅助消息，辅助信息用于请求释放第一终端设备与网络设备之间的RRC连接。从而使得第一终端设备可以在第二终端设备与网络设备的通信结束后，进入空闲态，有助于第一终端设备节省功耗。
在一种可能的设计中，网络设备向第二终端设备发送第一消息，第一消息用于指示第二终端设备释放与网络设备的RRC连接。从而有助于使得第二终端设备可以根据第一消息，释放与网络设备之间的RRC连接。
第七方面，提供一种通信装置，该通信装置包括：处理器和存储器。其中，处理器和存储器耦合。
示例的，该通信装置可以为终端设备或者终端设备中的芯片或者片上系统。具体的，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行第一方面或第二方面任一可能设计的方法、或者执行第四方面或第五方面任一可能设计的方法。
又示例的，该通信装置可以是网络设备，也可以是网络设备中的装置，或者是能够和网络设备匹配使用的装置。具体的，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行第三方面或第六方面中任一可能设计的方法。
第八方面，为本申请施例的一种通信装置，包括用于执行第一方面至第六方面中任一可能设计的方法的功能模块。
第九方面，为本申请实施例的一种计算机可读存储介质，该计算机可读存储介质中存储有计算机程序或指令，当其在计算机上运行时，可以使得计算机执行上述第一方面至第六方面中任一可能设计的方法。
第十方面，为本申请实施例的一种包含计算机程序或指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第一方面至第六方面中任一可能设计的方法。
第十一方面，为本申请实施例的一种芯片，该芯片包括处理器，当该处理器执行计算机程序或指令时，处理器用于执行上述第一方面至第六方面中任一可能设计的方法。该计算机程序或指令可以来自芯片内部的存储器，也可以来自芯片外部的存储器。可选的，该芯片还包括输入输出电路。
第十二方面，提供一种通信系统，包括网络设备、和终端设备。其中，终端设备用于执行上述第一方面、第二方面、第四方面和/或第五方面中任一可能设计的方法。网络设备用于执行上述第三方面和/或第五方面中任一可能设计的方法。
另外，第七方面至第十方面中任一可能设计方式所带来的技术效果可参见方法部分中不同设计方式所带来的技术效果，此处不再赘述。
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图1为本申请实施例的一种侧行通信的网络架构图；
图2为本申请实施例的另一侧行通信的网络架构图；
图3为本申请实施例的一种通信系统的网络架图；
图4为本申请实施例的一种通信方法的流程示意图；
图5为本申请实施例的另一通信方法的流程示意图；
图6为本申请实施例的一种通信装置的结构示意图；
图7为本申请实施例另一通信装置的结构示意图。
具体实施方式
首先，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
1、终端设备。本申请实施例中终端设备包括向用户提供语音和/或数据连通性的设备。换句话说，终端设备包括向用户提供语音的设备、或包括向用户提供数据连通性的设备、或包括向用户提供语音和数据连通性的设备。例如，终端设备可以包括具有无线连接功能的手持式设备、或连接到无线调制解调器的处理设备。在一些实施例中，终端设备可以经无线接入网(radio access network，RAN)与核心网进行通信，与RAN交换语音或数据，或与RAN交互语音和数据。例如，终端设备可以包括用户设备(user equipment，UE)、无线终端设备、移动终端设备、设备到设备通信(device-to-device，D2D)终端设备、车到一切(vehicle to everything，V2X)终端设备、机器到机器/机器类通信(machine-to-machine/machine-type communications，M2M/MTC)终端设备、物联网(internet of things，IoT)终端设备、签约单元(subscriber unit)、签约站(subscriber station)，移动站(mobile station)、远程站(remote station)、接入点(access point，AP)、远程终端(remote terminal)、接入终端(access terminal)、用户终端(user terminal)、用户代理(user agent)、或用户装备(user device)等。比如，移动电话(或称为“蜂窝”电话)，具有移动终端设备的计算机，便携式、袖珍式、手持式、计算机内置的移动装置等。再比如，个人通信业务(personal communication service，PCS)电话、无绳电话、会话发起协议(session initiation protocol，SIP)话机、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)等设备。
在本申请的另一些实施例中，终端设备还可以包括受限设备，例如功耗较低的设备，或存储能力有限的设备，或计算能力有限的设备等。例如包括条码、射频识别(radio frequency identification，RFID)、传感器、全球定位系统(global positioning system，GPS)、激光扫描器等信息传感设备、平板电脑(pad)、智慧屏、带无线收发功能的电脑、VR终端、AR终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。部署位置可以在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。
作为示例而非限定，在本申请实施例中终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备或智能穿戴式设备等，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能头盔、智能首饰等。
而如上介绍的各种终端设备，如果位于车辆上(例如放置在车辆内或安装在车辆内)，都可以认为是车载终端设备，车载终端设备例如也称为车载单元(on-board unit，OBU)。
此外，本申请实施例中，终端设备还可以包括中继(relay)。或者本申请实施例中能够与接入网设备进行数据通信的设备都可以看作终端设备。
本申请实施例中，用于实现终端设备的功能的装置可以是终端设备，也可以是能够支持终端设备实现该功能的装置，例如芯片系统，该装置可以被安装在终端设备中。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。本申请实施例提供的技术方案中，以用于实现终端的功能的装置是终端设备为例，描述本申请实施例提供的技术方案。
2、网络设备。本申请实施例中网络设备包括接入网(access network，AN)设备，例如基站(如，接入点)，可以是指接入网中在空口通过一个或多个小区与无线终端设备通信的设备，或者例如，一种车到一切(vehicle-to-everything，V2X)技术中的网络设备为路侧单元(road side unit，RSU)。基站可用于将收到的空中帧与互联网协议(internet protocol，IP)分组进行相互转换，作为终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括IP网络。RSU可以是支持V2X应用的固定基础设施实体，可以与支持V2X应用的其他实体交换消息。接入网设备还可协调对空口的属性管理。例如，接入网设备可以包括长期演进(long term evolution，LTE)系统或高级长期演进(long term evolution-advanced，LTE-A)中的演进型基站(NodeB或eNB或e-NodeB，evolutional Node B)，或者也可以包括第五代移动通信技术(the 5th generation，5G)NR系统(也简称为NR系统)中的下一代节点B(next generation node B，gNB)或者也可以包括云接入网(cloud radio access network，Cloud RAN)系统中的集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)，本申请实施例并不限定。
或者，本申请实施例中网络设备还可以包括核心网设备，核心网设备例如包括5G系统中的访问和移动管理功能(access and mobility management function，AMF)、会话管理功能(session management function，SMF)或用户面功能(user plane function，UPF)等，或者包括4G系统中的移动管理实体(mobility management entity，MME)等。
本申请实施例中，用于实现网络设备的功能的装置可以是网络设备，也可以是能够支持网络设备实现该功能的装置，例如芯片系统，该装置可以被安装在网络设备中。在本申请实施例提供的技术方案中，以用于实现网络设备的功能的装置是网络设备为例，描述本申请实施例提供的技术方案。
3、本申请实施例中的术语“系统”和“网络”可被互换使用。“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。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。
以及，除非有相反的说明，本申请实施例提及“第一”、“第二”等序数词是用于对多个对象进行区分，不用于限定多个对象的大小、内容、顺序、时序、优先级或者重要程度等。例如，第一配置信息和第二配置信息，只是为了区分不同的配置信息，而并不是表示这两个配置信息的信息量大小、内容、优先级或者重要程度等的不同。
下面结合附图分别针对不同的场景对本申请实施例的通信方法进行详细的介绍。
场景一：
示例的，如图1所示，为一种侧行通信的网络架构图，包括核心网设备、接入网设备、手机和智能眼镜。例如，智能眼镜可以为增强现实(augmented reality，AR)/虚拟现实(virtual reality，VR)眼镜。具体的，智能眼镜与手机可以通过侧行(sidelink，SL)链路通信，无需通过接入网设备。智能眼镜和手机的直接通信可以称之为侧行通信，即SL通信。通常，在网络覆盖范围内(in coverage，IC)的场景下，用于SL通信的传输资源可以是由接入网设备调度的；在网络覆盖范围外(out of coverage，OOC)的场景下，用于SL通信的传输资源可以是预配置资源。
图1所示的智能眼镜和手机可以分别通过Uu口与接入网设备通信。在这种情况下，因此，对于智能眼镜来说，仍然需要单独通过Uu口接入网络，这种方式容易增加智能眼镜的功耗。
因此，为了降低因Uu口给智能眼镜带来的功耗，智能眼镜可以通过手机与接入网设备通信，即智能眼镜与网络设备的通信可以通过手机中转，因此可以去除智能眼镜上的Uu口，或者不使用智能眼镜上的Uu口。在这种情况下，对于接入网设备来说，智能眼镜为远端(remote)终端设备，对于智能眼镜来说，手机为中继(relay)终端设备。手机为智能眼镜提供中继服务。这里所说的中继可以理解为：智能眼镜发送给接入网设备的信息，通过手机发送给接入网设备，而接入网设备发送给智能眼镜的信息，也通过手机发送给智能眼镜。
因此，为了保证智能眼镜与接入网设备通信的可靠性，手机需要处于连接态。然而，一些情况下，手机作为智能眼镜的中继终端设备时，智能眼镜发送给接入网设备的信息、或者接入网设备发送给智能眼镜的信息对于手机来说是透明的。因此，即使智能眼镜与接入网设备之间的通信结束，如接入网设备针对智能眼镜的鉴权流程结束、或者智能眼镜与接入网络之间的中继业务结束，手机也会一直处于连接(connected)态，无法进入空闲(idle)态或非激活(inactive)态，因此容易造成手机功耗的增加。
场景二：
示例的，如图2所示，为另一侧行通信的网络架构图，包括核心网设备、接入网设备、终端设备1和终端设备2。终端设备可能由于信号不好，或者在覆盖范围外，或者不具有Uu功能等情况，需要通过终端设备间的侧行链路与网络设备进行通信。
例如，以终端设备2为例。当终端设备2在覆盖信号不好或在网络覆盖范围外，即终端设备2未被网络覆盖时，或者终端设备2不具备Uu功能时，终端设备2与接入网设备或核心网设备的通信需要通过终端设备1中转，或者终端设备2需要通过终端设备1与接入网设备或核心网设备的通信。例如，终端设备2没有设置Uu口时，终端设备2不具备Uu功能。
在终端设备2与接入网设备通信或核心网设备通信需要通过终端设备1中转的情况下，即在终端设备2需要通过终端设备1与接入网设备通信或核心网设备通信的情况下，对于接入网设备来说，终端设备2是远端(remote)终端设备，而对于终端设备2来说，终端设备1为中继(relay)终端设备，终端设备1为终端设备2提供中继服务。这里所说的中继可以理解为：终端设备2发送给接入网设备的信息，通过终端设备1发送给接入网设备，而接入网设备发送给终端设备2的信息，也通过终端设备1发送给终端设备2。
因此，为了保证终端设备2与接入网设备通信的可靠性，终端设备1需要处于连接态。然而，一些情况下，终端设备1作为终端设备2的中继终端设备时，终端设备2发送给接入网设备或核心网设备的信息、或者接入网设备或核心网设备发送给终端设备2的信息对于终端设备1来说是透明的。因此，即使终端设备2与接入网设备之间的通信结束、或者终端设备2进入空闲(idle)态或非激活(inactive)态，终端设备1也会一直处于连接(connected)态，因此容易增加终端设备1的功耗。并且，由于终端设备1可能需要帮助终端设备2监听寻呼时机(paging occasion，PO)，来避免终端设备2漏听寻呼，但终端设备1并不知道何时终端设备2通信结束，需要接收寻呼，因此一直监听终端设备2的PO，将增加终端设备1的功耗。
针对场景一和场景二涉及的问题，本申请实施例提供了一种通信方法，通过引入第一指示信息，使得中继终端设备可以获知远端终端设备与网络设备之间的通信结束。
本申请实施例提供的通信方法可以应用于4G系统中，例如LTE系统，或可以应用于5G系统中，例如NR系统，或者还可以应用于下一代移动通信系统或其他类似的通信系统，具体不做限制。示例的，如图3所示，为本申请实施例的一种通信系统的网络架构图，包括网络设备、第一终端设备和第二终端设备。其中，关于第一终端设备和第二终端设备可以参见上述名词解释中关于终端设备的相关介绍，关于网络设备可以参见上述名词解释中关于网络设备的相关介绍，在此不再赘述。需要说明的是，图3所示的通信系统的网络架构仅为一种示例说明，并不构成对本申请实施例通信系统的网络架构的限定。例如，本申请实施例的通信系统中可以包括3个或更多个终端设备。
另外，本申请实施例的通信方法可以应用于D2D场景、或者V2X场景等。例如，DD场景可以包括NR-D2D场景等。再例如，V2X场景可以包括NR-V2X场景等。此外，本申请实施例的通信方法还可以应用于车联网，例如车与基础设施(vehicle-to-infrastructure，V2I)、车与车(vehicle-to-vehicle，V2V)等，或可应用于智能驾驶、辅助驾驶、或智能网联车等领域。本实施例的通信方法还可以应用于中继场景，如层2relay。
例如，用户现在可拥有很多种终端设备，例如手机、智能手表、智能手环、智能无线耳机或智能眼镜等，除手机外的其他设备是可以不设置Uu口的，其他设备可以通过手机接入网络，进行受到网络控制的SL通信，或者由手机对该设备在SL的通信进行控制。如智能眼镜通过与手机进行SL通信，使能用户在智能眼镜上观看到手机上的VR视频，甚 至是云端的VR视频。又如智能无线耳机通过与手机进行SL通信，使能用户收听音乐。
又例如，有些场景下终端设备未被网络覆盖，如地下室信号不足以支撑通信，位于地下室的终端设备可以通过位于楼上的终端设备与网络连接，建立通信链路，扩大现网的覆盖。
为了便于介绍，下文结合图3所示的网络结构对本申请实施例的方法进行介绍。示例的，第一终端设备具有Uu口，能够与网络设备通信，又可以作为中继终端(relay UE)；第二终端设备可作为远端终端(remote UE)可以不具有Uu口，无法与网络设备直接通信，或者，第二终端设备也可以具有Uu口。第一终端设备和第二终端设备可以进行SL通信。例如，第二终端设备位于网络覆盖范围外，或第二终端设备未设置Uu口，而第一终端设备位于网络覆盖范围内，则服务于第一终端设备的网络设备能够通过第一终端设备为第二终端设备提供配置信息。
实施例一：第一终端设备与第二终端设备需要进行直连通信(即SL通信)、且第二终端设备与网络设备需要进行中继业务。
示例的，如图4所示，为本申请实施例的一种通信方法的流程示意图，具体包括以下步骤。
401a、第一终端设备与第二终端设备建立第一连接。
示例的，在第一终端设备与第二终端设备需要进行直连通信(即SL通信)、且第二终端设备与网络设备需要进行中继业务的情况下，第一连接用于第二终端设备与第一终端设备通信、且第一连接用于第二终端设备与网络设备通信。
例如，第一连接为PC5-S连接，或者其他连接，如PC5-RRC连接。第一终端设备与第二终端设备基于第一连接进行直连通信业务，且第二终端设备基于第一连接建立与网络设备的连接。
以第一连接为PC5-S连接为例。在建立PC5-S连接前，可选的，第一终端设备与第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、和/或第二终端设备发现第一终端设备。例如，第一终端设备与第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、且第二终端设备发现第一终端设备。再例如，第一终端设备与第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、或者第二终端设备发现第一终端设备。以第二终端设备发现第一终端设备为例，第二终端设备可基于Pre-configuration资源发现第一终端设备，或者第二终端设备可基于网络配置的资源发现第一终端设备，例如，基于网络配置可以为某终端(包括第一终端)从网络设备接收到的配置资源，通过广播发送，第二终端设备接收到该资源的配置。其中，第一终端设备发现第二终端设备的方式与第二终端设备发现第一终端设备的方式类似，例如，第一终端设备可基于Pre-configuration资源发现第二终端设备，或者第一终端设备可基于网络配置的资源发现第二终端设备。
或者，在一些实施例中，在第一终端设备已发现第二终端设备、或第二终端设备已发现第一终端设备的情况下，则不需要在建立PC5-S连接前重复执行设备发现过程。在另一些实施例中，在第一终端设备已发现第二终端设备和第二终端设备已发现第一终端设备的情况下，也不需要在建立PC5-S连接前重复执行设备发现过程。例如，在建立PC5-S连接之前，第一终端设备和第二终端设备已经执行了设备发现过程，使得第一终端设备发现第 二终端设备、和/或第二终端设备发现第一终端设备。
本申请实施例中，如果第一终端设备和第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、且第二终端设备发现第一终端设备，即第一终端设备和第二终端设备相互发现，则第一终端设备和第二终端设备在执行设备发现过程后，可以彼此知道对方的存在。例如，第一终端设备发送广播消息，该广播消息可以用于指示第一终端设备的信息。其他终端设备(如第二终端设备)接收到该广播消息后，可以向第一终端设备回复消息，这就完成了第一终端设备和第二终端设备的相互发现。或者，第二终端设备发送广播消息，该广播消息用于指示第二终端设备的信息。其他终端设备(如第一终端设备)接收到该广播消息后，可以向第二终端设备回复消息，从而完成了第一终端设备和第二终端设备的相互发现。又或者，第一终端设备发送广播消息，该广播消息用于寻找满足条件的终端设备(例如，该广播消息用于指示一种或多种业务)，则能够支持上述业务的终端设备就是满足条件的终端设备。其他终端设备(例如第二终端设备)接收到该广播消息后，如果满足条件，则向第一终端设备回复消息，这就完成了第一终端设备和第二终端设备的相互发现。又或者，第二终端设备发送广播消息，该广播消息用于寻找满足条件的终端设备(例如，该广播消息用于指示一种或多种业务，则能够支持上述业务的终端设备就是满足条件的终端设备)。其他终端设备(例如第一终端设备)接收到该广播消息后，如果满足条件，则向第二终端设备回复消息，这就完成了第一终端设备和第二终端设备的相互发现。例如，第一终端设备发送广播消息，该广播消息包括第二终端设备的信息。其他终端设备(如第二终端设备)接收到该广播消息后，可以向第一终端设备回复消息，这就完成了第一终端设备和第二终端设备的相互发现。或者，第二终端设备发送广播消息，该广播消息包括第一终端设备的信息。其他终端设备(如第一终端设备)接收到该广播消息后，可以向第二终端设备回复消息，这就完成了第一终端设备和第二终端设备的相互发现。
或者，第一终端设备和第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、或者第二终端设备发现第一终端设备。例如，第一终端设备和第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备，则第一终端设备可以知道第二终端设备的存在，但是第二终端设备不知道第一终端设备的存在。再例如，第一终端设备和第二终端设备执行设备发现过程，使得第二终端设备发现第一终端设备，则第二终端设备可以知道第一终端设备的存在，但是第一终端设备不知道第二终端设备的存在。例如，以第二终端设备发现第一终端设备为例。第一终端设备发送广播消息，该广播消息可以用于指示第一终端设备的信息，或该广播消息可以用于寻找满足条件的终端设备(例如提供一种或多种业务，则能够支持上述业务的终端设备就是满足条件的终端设备)。其他终端设备(例如第二终端设备)在接收到该广播消息后，就发现了第一终端设备，即得知了第一终端设备的存在。再例如，以第一终端设备发现第二终端设备为例。第二终端设备发送广播消息，该广播消息可以用于指示第二终端设备的信息，或该广播消息可以用于寻找满足条件的终端设备(例如提供一种或多种业务，则能够支持上述业务的终端设备就是满足条件的终端设备)。其他终端设备(例如第一终端设备)在接收到该广播消息后，就发现了第二终端设备，即得知了第二终端设备的存在。
进一步的，第一终端设备发现第二终端设备、和/或第二终端设备发现第一终端设备后，第一终端设备和第二终端设备执行建立PC5-S连接的流程。例如，在第二终端设备发现第一终端设备的情况下，可以由第二终端设备向第一终端设备发起建立PC5-S连接的流程。 具体的，第二终端设备向第一终端设备发送PC5-S连接建立请求，第一终端设备接收到PC5-S连接建立请求，如果第一终端设备处于连接态，在确认可以建立该PC5-S连接后，向第二终端设备发送PC5-S连接建立完成消息，从而建立第一终端设备和第二终端设备之间的PC5-S连接。或者，第一终端设备接收到PC5-S连接建立请求，如果第一终端设备处于空闲态或非激活态，则触发进入到连接态，在确认可以建立该PC5-S连接后，向第二终端设备发送PC5-S连接建立完成消息。或者，在第一终端设备发现第二终端设备的情况下，也可以由第一终端设备向第二终端设备发起建立PC5-S连接，具体的，第一终端设备向第二终端设备发送PC5-S连接建立请求，第二终端设备接收到PC5-S连接建立请求，向第一终端设备发送PC5-S连接建立完成消息，从而建立第一终端设备和第二终端设备之间的PC5-S连接。需要说明的是，在PC5-S连接的建立是由第一终端设备发起的情况下，如果第一终端设备处于空闲态或非激活态时，还需要切换到连接态。或者，在第一终端设备和第二终端设备相互发现的情况下，可以PC5-S连接的建立可以是由第一终端设备发起的，也可以是由第二终端设备发起的，对此不作限定。
401b、第一终端设备与网络设备建立RRC连接。其中，第一终端设备与网络设备建立的RRC连接指的是第一终端设备与网络设备之间的RRC连接。其中，第一终端设备与网络设备之间的RRC连接为第二终端设备的relay链路。
示例的，第一终端设备处于空闲态或非激活态，向网络设备发起RRC连接建立的流程，从而进入连接态。
需要说明的是，步骤401a和步骤401b之间不具有必然的先后执行顺序，即步骤401b可以在步骤401a之前执行，也可以在步骤401a之后执行，还可以同时执行，对此不作限定。
401c、第二终端设备基于第一连接，通过第一终端设备与网络设备通信。
以第一连接为PC5-S连接为例，示例的，第二终端设备与网络设备是通过第二终端设备与网络设备之间的RRC连接通信的，而第二终端设备与网络设备之间的RRC连接是基于第一终端设备与网络设备之间的RRC连接、和第一终端设备和第二终端设备之间的PC5-S连接建立的。
其中，第二终端设备与网络设备的通信，可以包括第二终端设备向网络设备发送数据、和/或第二终端设备接收来自网络设备的数据。其中，第二终端设备发送给网络设备的数据是通过第一终端设备转发的，网络设备发送给第二终端设备的数据也是通过第一终端设备转发的。换句话说，第二终端设备与网络设备的通信包括数据中继过程。或者，第二终端设备与网络设备的通信，还可以包括网络设备针对第二终端设备的鉴权过程。具体的，网络设备针对第二终端设备的鉴权过程可以包括网络设备向第二终端设备发送鉴权信令，以及第二终端设备向网络设备发送对其鉴权信令的回复信息。而鉴权信令是通过第一终端设备转发给网络设备的，且对其鉴权信令的回复信息也是通过第一终端设备转发给网络设备的。
402、网络设备向第二终端设备发送第一消息，对应的第二终端设备接收网络设备发送的第一消息。第一消息用于指示第二终端设备释放与网络设备之间的RRC连接。需要说明的是，网络设备向第二终端设备发送第一消息，是可选的步骤，在图4中用虚线表示。
其中，网络设备是通过第一终端设备向第二终端设备发送第一消息的。
示例的，网络设备可以与第二终端设备的通信结束时，未释放与第二终端设备之间的 RRC连接之前，向第二终端设备发送第一消息；或者，网络设备可以释放与第二终端设备之间的RRC连接时，向第二终端设备发送第一消息；或者，网络设备可以释放与第二终端设备之间的RRC连接后，向第二终端设备发送第一消息。或者，网络设备也可以与第二终端设备的通信未结束时，向第二终端设备发送第一消息。需要说明的是，网络设备具体在什么情况下，向第二终端设备发送第一消息，本申请实施例对此不作限定。
示例的，第一消息为RRC连接释放消息。具体的，网络设备向第二终端设备发送RRC连接释放消息，对应的第二终端设备接收网络设备发送的RRC连接释放消息。例如，第二终端设备可以在接收到RRC连接释放消息后，由连接态切换到空闲态或者非激活态。
403a、网络设备向第一终端设备发送第一指示信息，对应的，第一终端设备接收第一终端设备发送的第一指示消息，第一指示信息用于指示第二终端设备与网络设备之间的通信结束。
示例的，第一指示信息可以通过指示第二终端设备与网络设备之间的中继业务结束，来指示第二终端设备与网络设备的通信结束。即，第一指示信息用于指示第二终端设备与网络设备之间的中继业务结束。其中，第一指示信息用于指示第二终端设备与网络设备之间的中继业务结束，可以理解为：第一指示信息用于指示第二终端设备与网络设备之间在上行方向和/或下行方向上的中继业务结束。而第二终端设备与网络设备之间在上行方向上中继业务结束指的是，第二终端设备在上行方向上没有relay相关业务；第二终端设备与网络设备之间在下行方向上中继业务结束指的是，第二终端设备在下行方向上没有relay相关业务；第二终端设备与网络设备之间在上、下行方向上中继业务均结束指的是，第二终端设备在上、下行方向上均没有relay相关业务。
又示例的，第一指示信息可以通过指示网络设备针对第二终端设备的鉴权流程结束，来指示第二终端设备与网络设备之间的通信结束。即第一指示信息用于指示网络设备针对第二终端设备的鉴权流程结束。
又示例的，第一指示信息通过指示第二终端设备进入非激活态或空闲态，来指示第二终端设备与网络设备的通信结束，即第一指示信息来指示第二终端设备进入非激活态或空闲态。
示例的，网络设备可以将第一指示信息携带在RRC消息(例如RRC重配置消息)中发送给第一终端设备。
在一些实施例中，网络设备与第二终端设备的通信结束，向第一终端设备发送第一指示信息。或者，网络设备也可以与第二终端设备的通信未结束时，向第二终端设备发送第一指示信息。本申请实施例中，网络设备具体在什么情况下，向第二终端设备发送第一指示信息，本申请实施例对此不作限定。
以网络设备与第二终端设备的通信结束，不再需要通过第一终端设备与第二终端设备之间的第一连接(例如PC5-S连接)进行通信，向第一终端设备发送第一指示信息为例。示例的，网络设备可以基于下列方式确定与第二终端设备的通信结束：
例如，网络设备释放与第二终端设备之间的RRC连接后，网络设备确定与第二终端设备的通信结束。
或者，网络设备与第二终端设备之间的中继业务结束，即第二终端设备与网络设备之间没有relay相关业务时，网络设备确定与第二终端设备的通信结束。
又或者，网络设备针对第二终端设备的鉴权流程结束，则网络设备确定与第二终端设 备的通信结束。
或者，网络设备当第二终端设备进入空闲态或者非激活态时，则网络设备确定与第二终端设备的通信结束。
需要说明的是，在执行步骤402的情况下，步骤402与步骤403a不具有必然的先后执行顺序，即步骤402可以在步骤403a之前执行，也可以在步骤403a之后执行，还可以同时执行，对此不作限定。
403b、第二终端设备向第一终端设备发送第一指示信息，对应的，第一终端设备接收第二终端设备发送的第一指示信息，第一指示信息用于指示第二终端设备与网络设备之间的通信结束。
示例的，第二终端设备可以将第一指示信息携带在PC5RRC消息或PC5-S消息中发送给第一终端设备。本申请实施例对携带第一指示信息的消息不作限定，例如，携带第一指示信息的消息也可以为新定义的一个消息。
在一些实施例中，在执行步骤402的情况下，第二终端设备可以在接收到第一消息后，向第一终端设备发送第一指示信息。或者，无论是否执行步骤402，第二终端设备在什么情况下，向第一终端设备发送第一指示信息，对此不作限定。例如，在不执行步骤402的情况下，第二终端设备与网络设备的通信结束，向第一终端设备发送第一指示信息。其中，关于第二终端设备确定与网络设备的通信结束的方式可以参见网络设备确定与第二终端设备通信结束的方式，在此不再赘述。
或者，在执行步骤402的情况下，第二终端设备也可以在接收到第一消息后，不向第一终端设备发送第一指示信息。
关于第一指示信息的介绍可以参见步骤403b中对于第一指示信息的介绍，在此不再赘述。
需要说明的是，在图4所示的通信方法中，可以仅执行步骤403a，不执行步骤403b，即网络设备向第一终端设备发送第一指示信息；或者，可以仅执行步骤403b，不执行步骤403a，即第二终端设备向第一终端设备发送第一指示信息。换句话说，在执行步骤403a，不执行步骤403b时的通信方法、与执行步骤403b，不执行步骤403a的通信方法是两个并列的技术方案。
或者，在一些实施例中，步骤403a和步骤403b均执行，在这种情况下，需要说明的是，步骤403a与403b不具有必然的先后执行顺序，即步骤403b可以在步骤403a之前执行，也可以在步骤403a之后执行，还可以同时执行，对此不作限定。
404、第一终端设备根据第一指示信息，确定第二终端设备与网络设备的通信结束。
其中，在执行步骤403a和403b的情况下，步骤404中的第一指示信息可以包括第二终端设备发送的第一指示信息和网络设备发送的第一指示信息。在仅执行步骤403a、不执行步骤403b的情况下，步骤404中的第一指示信息指的是网络设备发送的第一指示信息。在仅执行步骤403b、不执行步骤403a的情况下，步骤404中的第一指示信息指的是第二终端设备发送的第一指示信息。
通过步骤403a和/或403b，使得第一终端设备可以接收到第一指示信息，从而第一终端设备可以获知网络设备与第二终端设备的通信已结束，无需为第二终端设备提供中继服务，以便于后续第一终端设备根据自身的通信情况或通信需求，判断是否进入更节能的RRC状态，例如空闲态或非激活态等。
405、第一终端设备向网络设备发送辅助信息，相应的，网络设备接收第一终端设备发送的辅助信息。
示例的，辅助消息用于请求释放第一终端设备与网络设备之间的RRC连接，从而使得第一终端设备可以由连接态进入空闲态或非激活态，达到节省功耗的目的。
其中，步骤405为可选的步骤，在图4中用虚线表示。
当然，在一些实施例中，第一终端设备在接收到来自第二终端设备和/或网络设备的第一指示信息后，可以根据第一指示信息，确定第二终端设备与网络设备之间的通信结束(例如第二终端设备与网络设备之间的中继业务结束或者网络设备针对第二终端设备的鉴权流程结束等)。但是，并不根据第一指示信息，向网络设备发送辅助信息。或者，第一终端设备在接收到第一指示信息后，也可以不读取第一指示信息。又或者，第一终端设备在接收到第一指示信息后，不考虑其他因素的影响，直接向网络设备发送请求释放第一终端设备与网络设备之间的RRC连接的辅助信息。再或者，第一终端设备在接收到第一指示信息后，考虑其他因素的影响(如电池剩余电量、其他业务情况等)，判断是否向网络设备发送用于请求释放第一终端设备与网络设备之间的RRC连接的辅助消息。再或者，第一终端设备根据接收到的第一指示信息，及第一终端设备与网络设备是否有通信需求，确定是否向网络设备发送辅助信息。其中，第一终端设备与网络设备无通信需求可以包括第一终端设备上行缓存数据为零，或第一终端设备一段时间内未收到网络设备调度。例如，如果电池剩余电量较大、或者第一终端设备当前有数据下载业务或者语音通话业务等，则第一终端设备即使接收到第一指示信息，也不向网络设备发送用于请求释放第一终端设备与网络设备之间的RRC连接的辅助消息。
此外，还需要说明的是，图4所示的通信方法还可以应用于第一连接仅用于第二终端设备与网络设备通信的场景，例如上述场景二。
实施例二：第二终端设备需要通过第一终端设备与网络设备需要进行中继业务。
示例的，如图5所示，为本申请实施例的一种通信方法的流程示意图，具体包括以下步骤。
501a、第一终端设备与第二终端设备建立第一连接。其中，第一连接用于第二终端设备与网络设备的通信、或者，第一连接仅用于第二终端设备与网络设备的通信。
在第一连接仅用于第二终端设备与网络设备的通信时，第二终端设备无法通过第一连接与第一终端设备通信。
示例的，第一连接为PC5-S连接，或者其他连接，如PC5-RRC连接。第二终端设备与网络设备基于第一连接进行中继业务。
以第一连接为PC5-S连接为例。在建立PC5-S连接前，可选的，第一终端设备与第二终端设备执行设备发现过程，使得第一终端设备发现第二终端设备、和/或第二终端设备发现第一终端设备。或者，在第一终端设备已发现第二终端设备、和/或第二终端设备已发现第一终端设备的情况下，则不需要在建立PC5-S连接前重复执行设备发现过程。
关于设备发现过程、建立PC5-S连接的流程可以参见步骤401a中的相关介绍，在此不再赘述。
501b、第一终端设备与网络设备建立RRC连接。其中，第一终端设备与网络设备建立的RRC连接指的是第一终端设备与网络设备之间的RRC连接。
示例的，第一终端设备处于空闲态或非激活态，向网络设备发起RRC连接建立的流程，从而进入连接态。
需要说明的是，步骤501a和步骤501b之间不具有必然的先后执行顺序，即步骤501b可以在步骤501a之前执行，也可以在步骤501a之后执行，还可以同时执行，对此不作限定。
501c、第二终端设备基于第一连接，通过第一终端设备与网络设备通信。
以第一连接为PC5-S连接为例，示例的，第二终端设备与网络设备是通过第二终端设备与网络设备之间的RRC连接通信的，而第二终端设备与网络设备之间的RRC连接是基于第一终端设备与网络设备之间的RRC连接、和第一终端设备和第二终端设备之间的PC5-S连接建立的。
示例的，第二终端设备与网络设备之间的RRC连接的建立流程可以包括以下步骤：
1、第二终端设备向网络设备发送RRC连接建立请求，RRC连接建立请求用于请求建立RRC连接。
具体的，第二终端设备通过PC5-S连接将发送给网络设备的RRC连接建立请求发送给第一终端设备，第一终端设备接收到第二终端设备的RRC连接建立请求，通过与网络设备之间的RRC连接，将第二终端设备的RRC连接建立请求转发到网络设备。
2、网络设备接收第二终端设备的RRC连接建立请求后，向第二终端设备回复响应消息，从而完成第二终端设备与网络设备之间的RRC连接的建立。
第二终端设备与网络设备的通信可以包括第二终端设备向网络设备发送数据、和/或第二终端设备接收来自网络设备的数据。其中，第二终端设备发送给网络设备的数据是通过第一终端设备转发的，网络设备发送给第二终端设备的数据也是通过第一终端设备转发的。换句话说，第二终端设备与网络设备的通信可以包括数据中继过程。或者，第二终端设备与网络设备的通信可以包括第二终端设备接收来自网络设备的控制信令、和/或第二终端设备向网络设备发送对控制信令的回复消息。其中，网络设备发送给第二终端设备的控制信令也是通过第一终端设备转发的，第二终端设备发送给网络设备的对控制信令的回复消息是通过第一终端设备转发的。具体的，网络设备发送给第二终端设备的控制信令、和/或第二终端设备发送给网络设备的对控制信令的回复消息可以理解为中继信令的传输。示例的，中继信令可以包括RRC消息，如RRC重配消息，RRC重配完成消息等。这里仅为示例，不对中继信令进行限制。换句话说，第二终端设备与网络设备的通信还可以包括信令中继过程。
502a、第二终端设备向网络设备发送辅助信息，对应的，网络设备接收第二终端设备发送的辅助信息，该辅助消息用于请求网络设备释放与第二终端设备之间的RRC连接。
需要说明的是，步骤502a为可选的步骤，在图5中用虚线表示，即第二终端设备也可以不向网络设备发送辅助信息。
示例的，辅助消息用于请求释放第二终端设备与网络设备之间的RRC连接，从而使得第二终端设备可以由连接态进入空闲态或非激活态，有助于后续帮助第一终端设备节省功耗。
在一些实施例中，第二终端设备持续未向网络设备未发送上行数据达到某一时长时，向网络设备发送辅助信息。或者，第二终端设备也可以在网络信号强度持续小于某一阈值达到某一时长的情况下，向网络设备发送辅助信息。需要说明的是，第二终端设备具体在 什么情况下，向网络设备发送辅助信息，对此不作限定。
502b、网络设备向第二终端设备发送第一消息，第一消息用于指示第二终端设备释放与网络设备之间的RRC连接。需要说明的是，网络设备向第二终端设备发送第一消息，是可选的步骤，在图5中用虚线表示。
其中，网络设备是通过第一终端设备向第二终端设备发送第一消息的。
示例的，在执行步骤502a的情况下，网络设备可以在接收到来自第二终端设备的辅助信息后，根据该辅助信息，向第二终端设备发送第一消息。又示例的，无论是否执行步骤502a，网络设备在什么情况下，向第二终端设备发送第一消息，对此不作限定。例如，网络设备可以与第二终端设备的通信结束，未释放与第二终端设备之间的RRC连接之前，向第二终端设备发送第一消息；或者，网络设备可以释放与第二终端设备之间的RRC连接时，向第二终端设备发送第一消息；或者，网络设备可以释放与第二终端设备之间的RRC连接后，向第二终端设备发送第一消息。
例如，网络设备与第二终端设备之间没有relay相关业务时，则确定网络设备与第二终端设备的通信结束。或者，网络设备通过其他方式确定与第二终端设备的通信结束，对此不作限定。
需要说明的是，在执行步骤502a的情况下，网络设备也可以在接收到来自第二终端设备的辅助信息后，不向第二终端设备发送第一消息。
示例的，第一消息为RRC连接释放消息。具体的，网络设备向第二终端设备发送RRC连接释放消息，对应的第二终端设备接收网络设备发送的RRC连接释放消息。例如，第二终端设备可以在接收到RRC连接释放消息后，由连接态切换到空闲态或者非激活态。
503a、第二终端设备向第一终端设备发送第一指示信息，对应的，第一终端设备接收第二终端设备发送的第一指示消息，第一指示信息用于指示第二终端设备与网络设备之间的通信结束。
示例的，在执行步骤502a、502b的情况下，第二终端设备可以在接收到第一消息后，向第一终端设备发送第一指示信息。或者，在执行步骤502a、不执行步骤502b的情况下，步骤502a和步骤503a不具有必然的先后执行顺序，第二终端设备可以先向网络设备发送辅助信息，再向第一终端设备发送第一指示信息，也可以同时发送辅助信息和第一指示信息，或者先向第一终端设备发送第一指示信息，再向网络设备发送辅助信息，对此不作限定。
或者，在执行步骤502b、不执行步骤502a的情况下，第二终端设备可以在接收到第一消息后，向第一终端设备发送第一指示信息。
又或者，在步骤502a、502b均不执行的情况下，在一些实施例中，第二终端设备与网络设备的通信结束，向第一终端设备发送第一指示信息。例如，第二终端设备当与网络设备之间无中继业务时，确定第二终端设备与网络设备的通信结束。再例如，第二终端设备进入空闲态或者非激活态时，确定第二终端设备与网络设备的通信结束。需要说明的是，第二终端设备具体在什么情况下，向第一终端设备发送第一指示信息，本申请实施例对此不作限定。或者，第二终端设备向第一终端设备发送第一指示信息可以参见步骤403b中的相关介绍。
在另一些实施例中，第一指示信息用于指示第一终端设备监听第二终端设备的PO。具体的，当第二终端设备进入空闲态或非激活态时，如果存在第二终端设备的下行数据到 达，网络设备将在约定好的PO向第二终端设备发送寻呼消息，来寻呼第二终端设备，而第二终端设备是通过第一终端设备接收网络设备发送的寻呼消息的，因此，在第一指示信息用于指示第一终端设备监听第二终端设备的寻呼的情况下，第一终端设备需要在第二终端设备进入空闲态或非激活态后，在网络设备与第二终端设备约定好的PO上，监听第二终端设备的寻呼消息，从而降低第二终端设备进入空闲态或非激活态时遗漏网络设备针对第二终端设备的寻呼的可能性，从而有助于节省第二终端设备的功耗。此外，需要说明的是，第一终端设备在进入空闲态或者非激活态的情况下，第一终端设备也可以在网络设备与第二终端设备约定好的PO上监听第二终端设备的寻呼消息。
在一些实施例中，第一指示信息可以通过指示第二终端设备进入非激活态或空闲态，来指示第二终端设备与网络设备的通信结束，即第一指示信息用于指示第二终端设备进入非激活态或空闲态。
示例的，第二终端设备可以将第一指示信息携带在PC5RRC消息或PC5-S消息中发送给第一终端设备。本申请实施例对携带第一指示信息的消息不作限定，例如，携带第一指示信息的消息也可以为新定义的一个消息。
503b、网络设备向第一终端设备发送第一指示信息，对应的，第一终端设备接收网络设备发送的第一指示消息，第一指示信息用于指示第二终端设备与网络设备之间的通信结束。
示例的，在执行步骤502a的情况下，网络设备可以接收到第二终端设备发送的辅助消息后，向第一终端设备发送第一指示信息。又示例的，在无论是否执行步骤502a，网络设备与第二终端设备的通信结束，向第一终端设备发送第一指示信息。例如，网络设备当与第二终端设备之间的中继业务结束时，确定与第二终端设备的通信结束。或者，网络设备也可以通过其它方式，例如，网络设备释放与第二终端设备之间的RRC连接后，确定与第二终端设备的通信结束，对此本申请实施例不作限定。
或者，在执行步骤502a的情况下，网络设备也可以接收到第二终端设备发送的辅助消息后，不向第一终端设备发送第一指示信息。需要说明的是，网络设备在什么情况下，向第一终端设备发送第一指示信息，对此不作限定。
或者，网络设备向第一终端设备发送第一指示信息可以参见步骤403a中的相关介绍。
此外，在执行步骤502b的情况下，步骤503b和步骤502b不具有必然的先后执行顺序，即步骤503b可以在步骤503b之前执行，也可以在步骤503之后执行，还可以同时执行，对此不作限定。
需要说明的是，在图5所示的通信方法中，可以仅执行步骤503a，不执行步骤503b，即第二终端设备向第一终端设备发送第一指示信息；或者，可以仅执行步骤503b，不执行步骤503a，即网络设备向第一终端设备发送第一指示信息。换句话说，在执行步骤503a，不执行步骤503b时的通信方法、与执行步骤503b，不执行步骤503a的通信方法是两个并列的技术方案。
或者，在一些实施例中，步骤503a和步骤503b均执行，即第二终端设备、网络设备均向第一终端设备发送第一指示信息。在这种情况下，需要说明的是，步骤503a与503b不具有必然的先后执行顺序，即步骤503b可以在步骤503a之前执行，也可以在步骤503a之后执行，还可以同时执行，对此不作限定。
或者，在一些实施例中，仅执行步骤503a或步骤503b中的一个步骤。
504、第一终端设备根据第一指示信息，确定第二终端设备与网络设备通信结束或确定需要监听第二终端设备的寻呼。
其中，在执行步骤503a与503b的情况下，步骤504中的第一指示信息可以包括第二终端设备发送的第一指示信息和网络设备发送的第一指示信息。在仅执行步骤503a、不执行步骤503b的情况下，步骤504中的第一指示信息指的是第二终端设备发送的第一指示信息。在仅执行步骤503b、不执行步骤503a的情况下，步骤504中的第一指示信息指的是网络设备发送的第一指示信息。
通过步骤503a和/或503b，使得第一终端设备可以接收到第一指示信息，从而第一终端设备可以获知网络设备与第二终端设备的通信已结束，是否需要监听第二终端设备的寻呼，以便于后续第一终端设备根据自身的通信情况或通信需求，判断是否进入更节能的RRC状态，例如空闲态或非激活态等。
505、第一终端设备向网络设备发送辅助信息，相应的，网络设备接收第一终端设备发送的辅助信息。
示例的，辅助消息可以用于请求释放第一终端设备与网络设备之间的RRC连接，从而使得第一终端设备可以由连接态进入空闲态或非激活态，达到节省功耗的目的。
其中，步骤505为可选的步骤，在图5中用虚线表示。在步骤504中，第一终端设备根据第一指示信息，确定第二终端设备与网络设备通信结束的情况下，关于步骤505中辅助消息的介绍，可以参见步骤405中对于辅助消息的相关介绍。
在步骤504，第一终端设备根据第一指示信息，确定需要监听第二终端设备的寻呼的情况下，示例的，第一终端设备可以在第二终端设备的寻呼时机处于激活态，以降低遗漏网络设备针对第二终端设备的寻呼的可能性。
应理解，以上各个实施例可以单独使用，可以相互结合使用，以实现不同的技术效果。
上述本申请提供的实施例中，分别从网络设备和终端设备之间交互的角度对本申请实施例提供的方法进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，基站和终端设备可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
基于相同的构思，图6所示为本申请提供的一种通信装置600，包括收发模块620和处理模块610。
一示例中，该通信装置600可以是第一终端设备，也可以是能够支持第一终端设备实现图4、图5涉及的方法中第一终端设备的功能的装置。示例性地，通信装置600还可以是第一终端设备内的装置(如芯片或芯片系统)。需要说明的是，在本申请实施例中芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
在一些实施例中，处理模块610用于建立与第二终端设备之间的PC5-S连接；PC5-S连接用于第二终端设备与通信装置600通信、且PC5-S连接用于第二终端设备与网络设备通信；收发模块620，用于接收第一指示信息，第一指示信息用于指示第二终端设备与网络设备的通信结束。
在一些实施例中，收发模块620，还用于接收第一指示信息后，向网络设备发送辅助信息，辅助信息用于请求释放通信装置600与网络设备之间的RRC连接。
在一些实施例中，第一指示信息用于指示第二终端设备与网络设备之间的中继业务结 束；或者，第一指示信息用于指示网络设备针对第二终端设备的鉴权流程结束；或者，第一指示信息用于指示第二终端设备进入非激活态；或者，第一指示信息用于指示第二终端设备进入空闲态。
在一些实施例中，收发模块620，具体用于接收来自第二终端设备的第一指示信息；和/或，接收来自网络设备的第一指示信息。
在另一些实施例中，处理模块610，用于建立与第二终端设备之间的PC5-S连接；PC5-S连接用于第二终端设备与网络设备通信；收发模块620用于接收第一指示信息，第一指示信息用于指示第二终端设备与网络设备的通信结束、或者第一指示信息用于指示通信装置600监听第二终端设备的PO。
在另一些实施例中，收发模块620，还用于接收第一指示信息后，向网络设备发送辅助信息，辅助信息用于请求释放通信装置600与网络设备之间的RRC连接；或者，
接收第一指示信息后，监听第二终端设备的PO。
在另一些实施例中，第一指示信息用于指示第二终端设备进入非激活态；或者，第一指示信息用于指示第二终端设备进入空闲态；或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
在另一些实施例中，收发模块620，具体用于：接收来自第二终端设备的第一指示信息；和/或，接收来自网络设备的第一指示信息。
再一示例中，该通信装置600可以是第二终端设备，也可以是能够支持第二终端设备实现图4、图5涉及的方法中第二终端设备的功能的装置。示例性地，通信装置600还可以是第二终端设备内的装置(如芯片或芯片系统)。需要说明的是，在本申请实施例中芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
在一些实施例中，处理模块610，用于建立与第一终端设备之间的PC5-S连接，PC5-S连接用于通信装置600与第一终端设备通信、且PC5-S连接用于通信装置600与网络设备通信；
收发模块620，用于与网络设备的通信结束，向第一终端设备发送第一指示信息，第一指示信息用于指示通信装置600与网络设备的通信结束。
在一些实施例中，第一指示信息用于指示通信装置600与网络设备之间的中继业务结束；或者，第一指示信息用于指示网络设备针对通信装置600的鉴权流程结束；或者，第一指示信息用于指示通信装置600进入非激活态；或者，第一指示信息用于指示通信装置600进入空闲态。
在一些实施例中，收发模块620，还用于接收来自网络设备的第一消息，第一消息用于指示通信装置600释放与网络设备之间的RRC连接。
在另一些实施例中，处理模块610，用于建立与第一终端设备之间的PC5-S连接，PC5-S连接用于通信装置600与网络设备通信；收发模块620，用于与网络设备通信结束，向第一终端设备发送第一指示信息，第一指示信息用于指示通信装置600与网络设备的通信结束、或者，第一指示信息用于指示第一终端设备监听通信装置600的PO。
在另一些实施例中，第一指示信息用于指示第二终端设备进入非激活态；或者，第一指示信息用于指示第二终端设备进入空闲态；或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
在另一些实施例中，收发模块620，还用于接收网络设备发送的第一消息，第一消息用于指示通信装置600释放与网络设备之间的RRC连接。
又一示例中，该通信装置600可以是网络设备，也可以是能够支持网络设备实现图4和图5涉及的方法网络设备的功能的装置。示例性地，通信装置600还可以是网络设备内的装置(如芯片或芯片系统)。需要说明的是，在本申请实施例中芯片系统可以由芯片构成，也可以包含芯片和其他分立器件。
在一些实施例中，收发模块620，用于通过第一终端设备与第二终端设备之间的PC5-S连接，与第二终端设备通信，且PC5-S连接用于第一终端设备与第二终端设备通信；
处理模块610用于在收发模块620与第二终端设备的通信结束，触发收发模块620向第一终端设备发送第一指示信息，第一指示信息用于指示第二终端设备与通信装置600的通信结束。
在一些实施例中，第一指示信息用于指示第二终端设备与通信装置600之间的中继业务结束；或者，第一指示信息用于指示通信装置600针对第二终端设备的鉴权流程结束；或者，第一指示信息用于指示第二终端设备进入非激活态；或者，第一指示信息用于指示第二终端设备进入空闲态。
在一些实施例中，收发模块620，还用于接收第一终端设备发送的辅助消息，辅助信息用于请求释放第一终端设备与通信装置600之间的RRC连接。
在一些实施例中，收发模块620，还用于向第二终端设备发送第一消息，第一消息用于指示第二终端设备释放与通信装置600之间的RRC连接。
在另一些实施例中，收发模块620，用于通过第一终端设备与第二终端设备之间的PC5-S连接，与第二终端设备通信；
处理模块610，用于收发模块620与第二终端设备的通信结束，触发收发模块620向第一终端设备发送第一指示信息，第一指示信息用于指示第二终端设备与通信装置600的通信结束、或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
在另一些实施例中，第一指示信息用于指示第二终端设备进入非激活态；或者，第一指示信息用于指示第二终端设备进入空闲态；或者，第一指示信息用于指示第一终端设备监听第二终端设备的PO。
在另一些实施例中，收发模块620还用于接收第一终端设备发送的辅助消息，辅助信息用于请求释放第一终端设备与通信装置600之间的RRC连接。
在另一些实施例中，收发模块620还用于向第二终端设备发送第一消息，第一消息用于指示第二终端设备释放与通信装置600之间的RRC连接。
关于处理模块610、收发模块620的具体执行过程，可参见上方法实施例中的记载。本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，另外，在本申请各个实施例中的各功能模块可以集成在一个处理器中，也可以是单独物理存在，也可以两个或两个以上模块集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
与上述构思相同，如图7所示，本申请实施例还提供一种通信装置700。
一示例中，该通信装置700用于实现图4和图5涉及的方法中第一终端设备的功能，该装置可以是第一终端设备，也可以是第一终端设备中的装置。通信装置700包括至少一 个处理器77，用于实现上述方法中第一终端设备的功能。示例地，处理器710可以用于建立与第二终端设备之间的PC5-S连接，具体参见方法中的详细描述，此处不再说明。
又一示例中，该通信装置700用于实现图4和图5涉及的方法中第二终端设备的功能，该装置可以是第二终端设备，也可以是第二终端设备中的装置。通信装置700包括至少一个处理器710，用于实现上述方法中第二终端设备的功能。示例地，处理器710可以用于建立与第一终端设备之间的PC5-S连接，具体参见方法中的详细描述，此处不再说明。
又一示例中，该通信装置700用于实现图4和图5涉及的方法中网络设备的功能，该装置可以是网络设备，也可以是网络设备中的装置。通信装置700包括至少一个处理器710，用于实现上述方法中网络设备的功能。示例地，处理器710可以用于与第二终端设备的通信结束，触发发送第一指示信息，具体参见方法中的详细描述，此处不再说明。
在一些实施例中，通信装置700还可以包括至少一个存储器720，用于存储计算机程序或指令。存储器720和处理器710耦合。本申请实施例中的耦合是装置、单元或模块之间的间隔耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。作为另一种实现，存储器720还可以位于通信装置700之外。处理器710可以和存储器720协同操作。处理器710可能执行存储器720中存储的计算机程序。所述至少一个存储器中的至少一个可以包括于处理器中。
在一些实施例中，通信装置700还可以包括通信接口730，用于通过传输介质和其它设备进行通信，从而用于通信装置700中的装置可以和其它设备进行通信。示例性地，通信接口730可以是收发器、电路、总线、模块或其它类型的通信接口，该其它设备可以是终端设备或网络设备。处理器710利用通信接口730收发消息(第一消息等)，并用于实现上述实施例中的方法。示例性的，以通信装置700为第一终端设备为例，通信接口730可以用于接收第一指示信息。
本申请实施例中不限定上述通信接口730、处理器710以及存储器720之间的连接介质。例如，本申请实施例在图7中以存储器720、处理器710以及通信接口730之间可以通过总线连接，所述总线可以分为地址总线、数据总线、控制总线等。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
在本申请实施例中，存储器可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
需要说明的是，在图6和图7所示的通信装置为设备中的装置(如芯片)的情况下，通信装置600和通信装置700可以使用下述电路或者器件来实现：一个或多个现场可编程门阵列(field programmable gate array，FPGA)、可编程逻辑器件(programmable logic device，PLD)、控制器、状态机、门逻辑、分立硬件部件、任何其他适合的电路、或者能够执行本 申请通篇所描述的各种功能的电路的任意组合。
本申请实施例提供的方法中，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指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明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、网络设备、用户设备或者其他可编程装置。所述计算机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(例如同轴电缆、光纤、数字用户线(digital subscriber line，简称DSL))或无线(例如红外、无线、微波等)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可以存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、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)、光介质(例如，数字视频光盘(digital video disc，简称DVD))、或者半导体介质(例如，SSD)等。
结合以上，本申请还提供如下实施例：
实施例1、一种通信方法，包括：
第一终端设备建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与所述第一终端设备通信、且所述PC5-S连接用于所述第二终端设备与网络设备通信；
第一终端设备接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例2、根据实施例1所述的方法，所述方法还包括：
所述第一终端设备接收第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接。
实施例3、根据实施例1或2所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例4、根据实施例1至3任一项所述的方法，所述第一终端设备接收第一指示信息，包括：
所述第一终端设备接收来自所述第二终端设备的所述第一指示信息；和/或，
所述第一终端设备接收来自所述网络设备的所述第一指示信息。
实施例5、一种通信方法，包括：
第二终端设备建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述第二终端设备与所述第一终端设备通信、且所述PC5-S连接用于所述第二终端设备与网络设备 通信；
所述第二终端设备与所述网络设备的通信结束；
所述第二终端设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例6、根据实施例5所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例7、根据实施例5或6所述的方法，还包括：
所述第二终端设备接收来自所述网络设备的第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例8、一种通信方法，包括：
网络设备通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信，且所述PC5-S连接用于所述第一终端设备与所述第二终端设备通信；
所述网络设备与所述第二终端设备的通信结束；
所述网络设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例9、根据实施例8所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例10、根据实施例8或9所述的方法，还包括：
所述网络设备接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接。
实施例11、根据实施例8至10任一项所述的方法，还包括：
所述网络设备向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例12、一种通信方法，包括：
第一终端设备建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与网络设备通信；
第一终端设备接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例13、根据实施例12所述的方法，还包括：
所述第一终端设备接收所述第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接；或者，
所述第一终端设备接收所述第一指示信息后，监听所述第二终端设备的寻呼时机PO。
实施例14、根据实施例12或13所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例15、根据实施例12至14任一项所述的方法，所述第一终端设备接收第一指示信息，包括：
所述第一终端设备接收来自所述第二终端设备的所述第一指示信息；和/或，
所述第一终端设备接收来自所述网络设备的所述第一指示信息。
实施例16、一种通信方法，包括：
第二终端设备建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述第二终端设备与网络设备通信；
所述第二终端设备与所述网络设备通信结束；
所述第二终端设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例17、根据实施例16所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例18、根据实施例16或17所述的方法，还包括：
所述第二终端设备接收所述网络设备发送的第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例19、一种通信方法，包括：
网络设备通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信；
所述网络设备与所述第二终端设备的通信结束；
所述网络设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例20、根据实施例19所述的方法，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的寻呼时机PO。
实施例21、根据实施例19或20所述的方法，还包括：
所述网络设备接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所 述第一终端设备与所述网络设备之间的RRC连接。
实施例22、根据实施例19至21任一项所述的方法，还包括：
所述网络设备向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例23、一种通信装置，该通信装置可以为第一终端设备或者第一终端设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与所述通信装置通信、且所述PC5-S连接用于所述第二终端设备与网络设备通信；
接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例24、根据实施例23所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置还执行以下步骤：
接收第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述通信装置与所述网络设备之间的RRC连接。
实施例25、根据实施例23或24所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例26、根据实施例23至25任一项所述的通信装置，所述接收第一指示信息，包括：
接收来自所述第二终端设备的所述第一指示信息；和/或，
接收来自所述网络设备的所述第一指示信息。
实施例27、一种通信装置，该通信装置可以为第二终端设备或者第二终端设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述通信装置与所述第一终端设备通信、且所述PC5-S连接用于所述通信装置与网络设备通信；
与所述网络设备的通信结束；
向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述通信装置与所述网络设备的通信结束。
实施例28、根据实施例27所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或 者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例29、根据实施例27或28所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
接收来自所述网络设备的第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例30、一种通信装置，该通信装置可以为网络设备或者网络设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信，且所述PC5-S连接用于所述第一终端设备与所述第二终端设备通信；
与所述第二终端设备的通信结束；
向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束。
实施例31、根据实施例30所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例32、根据实施例30或31所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述通信装置之间的RRC连接。
实施例33、根据实施例30至32任一项所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述通信装置之间的RRC连接。
实施例34、一种通信装置，该通信装置可以为第一终端设备或者第一终端设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与网络设备通信；
接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例35、根据实施例34所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
接收所述第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述通信装置与所述网络设备之间的RRC连接；或者，
接收所述第一指示信息后，监听所述第二终端设备的寻呼时机PO。
实施例36、根据实施例34或35所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例37、根据实施例34至36任一项所述的通信装置，所述接收第一指示信息，包括：
接收来自所述第二终端设备的所述第一指示信息；和/或，
接收来自所述通信装置的所述第一指示信息。
实施例38、一种通信装置，该通信装置可以为第二终端设备或者第二终端设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述通信装置与网络设备通信；
与所述网络设备通信结束；
向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束。
实施例39、根据实施例38所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例40、根据实施例38或39所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置还执行以下步骤：
接收所述网络设备发送的第一消息，所述第一消息用于指示所述通信装置释放与所述网络设备之间的RRC连接。
实施例41、一种通信装置，该通信装置可以为网络设备或者网络设备中的芯片或者片上系统，该通信装置包括：处理器和存储器，存储器存储有计算机程序或指令，当计算机程序或指令被处理器执行时，使得通信装置执行以下步骤：
通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信；
与所述第二终端设备的通信结束；
向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束。
实施例42、根据实施例41所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的寻呼时机PO。
实施例43、根据实施例40或42所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置还执行以下步骤：
接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述通信装置之间的RRC连接。
实施例44、根据实施例41至43任一项所述的通信装置，当计算机程序或指令被处理器执行时，使得通信装置还执行以下步骤：
向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述通信装置之间的RRC连接。
实施例45、一种通信装置，包括处理模块和收发模块；
所述处理模块，用于建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与所述通信装置通信、且所述PC5-S连接用于所述第二终端设备与网络设备通信；
所述收发模块，用于接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例46、根据实施例45所述的通信装置，所述收发模块，还用于：
接收第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述通信装置与所述网络设备之间的RRC连接。
实施例47、根据实施例45或46所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例48、根据实施例45至47任一项所述的通信装置，所述收发模块，用于接收第一指示信息，具体包括：
所述收发模块，用于：接收来自所述第二终端设备的所述第一指示信息，和/或接收来自所述网络设备的所述第一指示信息。
实施例49、一种通信装置，包括：处理模块和收发模块；
所述处理模块，用于建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述通信装置与所述第一终端设备通信、且所述PC5-S连接用于所述通信装置与网络设备通信；
与所述网络设备的通信结束；
向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述通信装置与所述网络设备的通信结束。
实施例50、根据实施例49所述的通信装置，所述第一指示信息用于指示所述通信装置与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述通信装置与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述通信装置的鉴权流程结束；或者，
所述第一指示信息用于指示所述通信装置进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述通信装置进入空闲(idle)态。
实施例51、根据实施例49或50所述的通信装置，所述收发模块，还用于：
接收来自所述网络设备的第一消息，所述第一消息用于指示所述通信装置释放与所述网络设备之间的RRC连接。
实施例52、一种通信装置，包括：处理模块和收发模块；
所述收发模块，用于通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信，且所述PC5-S连接用于所述第一终端设备与所述第二终端设备通信；
所述处理模块，用于所述收发模块与所述第二终端设备的通信结束，触发所述收发模块向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束。
实施例53、根据实施例52所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述通信装置之间的中继业务结束；或者，
所述第一指示信息用于指示所述通信装置针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例54、根据实施例52或53所述的通信装置，所述收发模块，还用于：
接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述通信装置之间的RRC连接。
实施例55、根据实施例52至54任一项所述的通信装置，所述收发模块，还用于：
向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述通信装置之间的RRC连接。
实施例56、一种通信装置，包括：处理模块和收发模块；
所述处理模块，用于建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与网络设备通信；
所述收发模块，用于接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例57、根据实施例56所述的通信装置，所述收发模块，还用于：
接收所述第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述通信装置与所述网络设备之间的RRC连接；或者，
接收所述第一指示信息后，监听所述第二终端设备的PO。
实施例58、根据实施例56或57所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例59、根据实施例56至58任一项所述的通信装置，所述收发模块，用于接收第一指示信息，具体包括：
所述收发模块，用于接收来自所述第二终端设备的所述第一指示信息，和/或，接收来自所述网络设备的所述第一指示信息。
实施例60、一种通信装置，包括处理模块和收发模块；
所述处理模块，用于建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述通信装置与网络设备通信；
所述收发模块，用于与所述网络设备通信结束，向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述通信装置与所述网络设备的通信结束。
实施例61、根据实施例60所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述通信装置进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述通信装置进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述通信装置的PO。
实施例62、根据实施例60或61所述的通信装置，所述收发模块，还用于：
接收所述网络设备发送的第一消息，所述第一消息用于指示所述通信装置释放与所述网络设备之间的RRC连接。
实施例63、一种通信装置，包括：处理模块和收发模块；
所述收发模块，用于通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信；
所述处理模块，用于所述收发模块与所述第二终端设备的通信结束，触发所述收发模块向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束。
实施例64、根据实施例63所述的通信装置，所述第一指示信息用于指示所述第二终端设备与所述通信装置的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的寻呼时机PO。
实施例65、根据实施例63或64所述的通信装置，所述收发模块还用于：
接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述通信装置之间的RRC连接。
实施例66、根据实施例63至65任一项所述的通信装置，所述收发模块还用于：
向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述通信装置的RRC之间连接。
实施例67、一种通信系统，包括：第一终端设备、第二终端设备和网络设备；
所述第一终端设备与所述第二终端设备建立PC5-S连接；所述PC5-S连接为所述第一终端设备和所述第二终端设备之间的PC5-S连接，用于所述第二终端设备与所述第一终端设备通信；
所述网络设备和所述第二终端设备通过所述PC5-S连接通信；
所述网络设备和/或所述第二终端设备向所述第一终端设备发送第一指示信息，所述第 一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
实施例68、根据实施例67所述的通信系统，所述第一终端设备接收所述第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接。
实施例69、根据实施例66或67所述的通信系统，所述网络设备还向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例70、根据实施例66至69任一所述的通信系统，所述网络设备和/或所述第二终端设备向所述第一终端设备发送第一指示信息之前，所述网络设备与所述第二终端设备的通信结束。
实施例71、根据实施例66至70任一所述的通信系统，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
实施例72、一种通信系统，包括：第一终端设备、第二终端设备和网络设备；
所述第一终端设备与所述第二终端设备建立PC5-S连接；所述PC5-S连接为所述第一终端设备和所述第二终端设备之间的PC5-S连接；
所述网络设备和所述第二终端设备通过所述PC5-S连接通信；
所述网络设备和/或所述第二终端设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束、或者说是第一指示信息用于指示说是第一终端设备监听所述第二终端设备的PO。
实施例73、根据实施例72所述的通信系统，所述第一终端设备接收所述第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接；或者，
所述第一终端设备接收所述第一指示信息后，监听所述第二终端设备的寻呼时机PO。
实施例74、根据实施例72或73所述的通信系统，所述网络设备还向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
实施例75、根据实施例72至74任一所述的通信系统，所述网络设备和/或所述第二终端设备向所述第一终端设备发送第一指示信息之前，所述网络设备和所述第二终端设备的通信结束。
实施例76、根据实施例72至75任一所述的通信系统，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态；或者，
所述第一指示信息用于指示所述第一终端设备监听所述第二终端设备的PO。
实施例76、一种计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述实施例1至实施例4任一实施例所涉及的方法、或者执行上述实施例5至7任一所涉及的方法、或者执行实施例8至11任一所涉及的方法、或者执行实施例12至15任一所涉及的方法、或者执行实施例16至18任一所涉及的方法、或者执行实施例19至22任一所涉及的方法。
实施例77、一种计算机可读存储介质，该计算机可读存储介质中存储有计算机程序或指令，当其在计算机上运行时，使得计算机可以执行上述实施例1至实施例4任一实施例所涉及的方法、或者执行上述实施例5至7任一所涉及的方法、或者执行实施例8至11任一所涉及的方法、或者执行实施例12至15任一所涉及的方法、或者执行实施例16至18任一所涉及的方法、或者执行实施例19至22任一所涉及的方法。
实施例78、一种芯片，该芯片包括处理器，当该处理器执行计算机程序或指令时，处理器用于执行上述实施例1至实施例4任一实施例所涉及的方法、或者执行上述实施例5至7任一所涉及的方法、或者执行实施例8至11任一所涉及的方法、或者执行实施例12至15任一所涉及的方法、或者执行实施例16至18任一所涉及的方法、或者执行实施例19至22任一所涉及的方法。该计算机程序或指令可以来自芯片内部的存储器，也可以来自芯片外部的存储器。可选的，该芯片还包括输入输出电路。
尽管在此结合各实施例对本申请进行了描述，然而，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。

Claims (14)

  1. 一种通信方法，其特征在于，所述方法包括：
    第一终端设备建立与第二终端设备之间的PC5-S连接；所述PC5-S连接用于所述第二终端设备与所述第一终端设备通信、且所述PC5-S连接用于所述第二终端设备与网络设备通信；
    第一终端设备接收第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备接收第一指示信息后，向所述网络设备发送辅助信息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接。
  3. 如权利要求1或2所述的方法，其特征在于，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
    所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
    所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
    所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
    所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
  4. 如权利要求1至3任一项所述的方法，其特征在于，所述第一终端设备接收第一指示信息，包括：
    所述第一终端设备接收来自所述第二终端设备的所述第一指示信息；和/或，
    所述第一终端设备接收来自所述网络设备的所述第一指示信息。
  5. 一种通信方法，其特征在于，所述方法包括：
    第二终端设备建立与第一终端设备之间的PC5-S连接，所述PC5-S连接用于所述第二终端设备与所述第一终端设备通信、且所述PC5-S连接用于所述第二终端设备与网络设备通信；
    所述第二终端设备与所述网络设备的通信结束；
    所述第二终端设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
  6. 如权利要求5所述的方法，其特征在于，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
    所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
    所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
    所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
    所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
  7. 如权利要求5或6所述的方法，其特征在于，所述方法还包括：
    所述第二终端设备接收来自所述网络设备的第一消息，所述第一消息用于指示所述第 二终端设备释放与所述网络设备之间的RRC连接。
  8. 一种通信方法，其特征在于，包括：
    网络设备通过第一终端设备与第二终端设备之间的PC5-S连接，与所述第二终端设备通信，且所述PC5-S连接用于所述第一终端设备与所述第二终端设备通信；
    所述网络设备与所述第二终端设备的通信结束；
    所述网络设备向所述第一终端设备发送第一指示信息，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束。
  9. 如权利要求8所述的方法，其特征在于，所述第一指示信息用于指示所述第二终端设备与所述网络设备的通信结束，包括：
    所述第一指示信息用于指示所述第二终端设备与所述网络设备之间的中继业务结束；或者，
    所述第一指示信息用于指示所述网络设备针对所述第二终端设备的鉴权流程结束；或者，
    所述第一指示信息用于指示所述第二终端设备进入非激活(inactive)态；或者，
    所述第一指示信息用于指示所述第二终端设备进入空闲(idle)态。
  10. 如权利要求8或9所述的方法，其特征在于，所述方法还包括：
    所述网络设备接收所述第一终端设备发送的辅助消息，所述辅助信息用于请求释放所述第一终端设备与所述网络设备之间的RRC连接。
  11. 如权利要求8至10任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备向所述第二终端设备发送第一消息，所述第一消息用于指示所述第二终端设备释放与所述网络设备之间的RRC连接。
  12. 一种通信装置，其特征在于，包括处理器和存储器，所述处理器和存储器耦合，所述存储器用于存储计算机程序或指令，当所述处理器执行所述计算机程序或指令时，使得所述通信装置执行权利要求1至4中任一所述的通信方法、或者执行权利要求5至7中任一所述的通信方法、或者执行权利要求8至11中任一所述的通信方法。
  13. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括计算机程序或指令，当所述计算机程序或指令在计算机上运行时，执行权利要求1至4中任一所述的通信方法、或者权利要求5至7中任一所述的通信方法、或者权利要求8至11中任一所述的通信方法。
  14. 一种芯片，其特征在于，包括处理器，当所述处理器执行计算机程序或指令时，所述处理器执行权利要求1至4中任一所述的通信方法、或者权利要求5至7中任一所述的通信方法、或者权利要求8至11中任一所述的通信方法。
PCT/CN2021/103548 2020-06-30 2021-06-30 一种通信方法及装置 WO2022002134A1 (zh)

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