WO2022032539A1

WO2022032539A1 - Relay method and terminal

Info

Publication number: WO2022032539A1
Application number: PCT/CN2020/108737
Authority: WO
Inventors: 杨皓睿
Original assignee: Oppo广东移动通信有限公司
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2022-02-17
Also published as: CN115669211A

Abstract

The present application relates to a relay method and a terminal. The relay method comprises: a first terminal receives a first indication, the first indication being used for indicating whether a second terminal supports or is in an energy-saving mode. In embodiments of the present application, by indicating whether a terminal supports or is in an energy-saving mode, a relay service in the energy-saving mode can be achieved, thereby achieving the purpose of energy saving of the terminal.

Description

Relay method and terminal

technical field

The present application relates to the field of communications, and more particularly, to a relay method and terminal.

Background technique

With the continuous development of 5th-Generation (5G) applications, the Network Controlled Interactive Services (NCIS) business has been introduced into the standard as a new business form for related standardized services.

NCIS services are mainly aimed at applications such as Augmented Reality (AR), Virtual Reality (VR), and games, and have high requirements for service quality such as rate, delay, packet loss rate, and high-speed codec. For example: for VR games, the rate needs to be 10Gbps, and the packet loss rate cannot exceed 10E-4 (10 to the power of -4). A session established for an NCIS service is an NCIS session, and user equipment (User Equipment, UE) in the same NCIS session can be considered to form an NCIS group, for example, a team in a game.

The communication of remote UE is served through UE-to-network relay to provide higher-speed, more reliable services, and to expand coverage. For example, a remote UE that is not in coverage can obtain service by relaying the UE. How to save energy in the relay process needs to be solved urgently.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a relay method and a terminal, which can realize energy saving of the terminal.

The embodiment of the present application provides a relay method, including:

The first terminal receives a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

The embodiment of the present application provides a relay method, including:

The second terminal sends a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

An embodiment of the present application provides a first terminal, including:

A receiving unit, configured to receive a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

An embodiment of the present application provides a first terminal, wherein the receiving unit is further configured to receive a discovery message from the second terminal, where the discovery message includes the first indication and the first timer.

An embodiment of the present application provides a terminal device, including a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, so that the terminal device executes the above-mentioned relay method.

An embodiment of the present application provides a chip for implementing the above-mentioned relay method.

Specifically, the chip includes: a processor for invoking and running a computer program from the memory, so that the device installed with the chip executes the above-mentioned relay method.

Embodiments of the present application provide a computer-readable storage medium for storing a computer program, and when the computer program is run by a device, the device enables the device to execute the above-mentioned relay method.

An embodiment of the present application provides a computer program product, including computer program instructions, and the computer program instructions cause a computer to execute the above-mentioned relay method.

The embodiments of the present application provide a computer program, which, when running on a computer, enables the computer to execute the above-mentioned relay method.

In this embodiment of the present application, by indicating whether the terminal supports or is in the energy-saving mode, the relay service in the energy-saving mode can be implemented, and the purpose of saving energy of the terminal can be achieved.

Description of drawings

FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a system architecture of a ProSe UE-to-Network Relay (ProSe UE-to-Network Relay).

FIG. 3 is a schematic flowchart of a relay method according to an embodiment of the present application.

FIG. 4 is a schematic flowchart of a relay method according to another embodiment of the present application.

FIG. 5 is a schematic flowchart of Example 1 of a relay method according to another embodiment of the present application.

FIG. 6 is a schematic flowchart of Example 2 of a relay method according to another embodiment of the present application.

FIG. 7 is a schematic block diagram of a first terminal according to an embodiment of the present application.

FIG. 8 is a schematic block diagram of a first terminal according to another embodiment of the present application.

FIG. 9 is a schematic block diagram of a second terminal according to an embodiment of the present application.

FIG. 10 is a schematic block diagram of a second terminal according to another embodiment of the present application.

FIG. 11 is a schematic block diagram of a communication device according to an embodiment of the present application.

FIG. 12 is a schematic block diagram of a chip according to an embodiment of the present application.

FIG. 13 is a schematic block diagram of a communication system according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a wideband Code Division Multiple Access (CDMA) system (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (General Packet Radio Service, GPRS), Long Term Evolution (Long Term Evolution, LTE) system, Advanced Long Term Evolution (Advanced long term evolution, LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) unlicensed spectrum, NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application can also be applied to these communication systems.

Optionally, the communication system in this embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a standalone (Standalone, SA) distribution. web scene.

Optionally, the communication system in the embodiment of the present application may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; or, the communication system in the embodiment of the present application may also be applied to a licensed spectrum, where, Licensed spectrum can also be considered unshared spectrum.

The embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, where the terminal equipment may also be referred to as user equipment (User Equipment, UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

The terminal device can be a station (STAION, ST) in the WLAN, can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, next-generation communication systems such as end devices in NR networks, or future Terminal equipment in the evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.

In this embodiment of the present application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, and satellites) superior).

In this embodiment of the present application, the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, and an augmented reality (Augmented Reality, AR) terminal Equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city or wireless terminal equipment in smart home, etc.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices, which are the general term for the intelligent design of daily wear and the development of wearable devices using wearable technology, such as glasses, gloves, watches, clothing and shoes. 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. In a broad sense, 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 jewelry, etc. for physical sign monitoring.

In this embodiment of the present application, the network device may be a device for communicating with a mobile device, and the network device may be an access point (Access Point, AP) in WLAN, or a base station (Base Transceiver Station, BTS) in GSM or CDMA , it can also be a base station (NodeB, NB) in WCDMA, it can also be an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or in-vehicle equipment, wearable devices and NR networks The network equipment (gNB) in the PLMN network in the future evolution or the network equipment in the NTN network, etc.

As an example and not a limitation, in this embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a High Elliptical Orbit (HEO) ) satellite etc. Optionally, the network device may also be a base station set in a location such as land or water.

In this embodiment of the present application, a network device may provide services for a cell, and a terminal device communicates with the network device through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device ( For example, the cell corresponding to the base station), the cell can belong to the macro base station, or it can belong to the base station corresponding to the small cell (Small cell). Pico cell), Femto cell (Femto cell), etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

FIG. 1 exemplarily shows a communication system 100 . The communication system includes one network device 110 and two terminal devices 120 . Optionally, the communication system 100 may include multiple network devices 110, and the coverage of each network device 110 may include other numbers of terminal devices 120, which are not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include a mobility management entity (Mobility Management Entity, MME), an access and mobility management function (Access and Mobility Management Function, AMF) and other network entities, to which the embodiments of the present application Not limited.

Wherein, the network equipment may further include access network equipment and core network equipment. That is, the wireless communication system further includes a plurality of core networks for communicating with the access network equipment. The access network equipment may be a long-term evolution (long-term evolution, LTE) system, a next-generation (mobile communication system) (next radio, NR) system, or an authorized auxiliary access long-term evolution (authorized auxiliary access long-term evolution, LAA- The evolved base station (evolutional node B, may be referred to as eNB or e-NodeB for short) in the LTE) system is a macro base station, a micro base station (also called a "small base station"), a pico base station, an access point (AP), Transmission site (transmission point, TP) or new generation base station (new generation Node B, gNodeB), etc.

It should be understood that, in the embodiments of the present application, a device having a communication function in the network/system may be referred to as a communication device. Taking the communication system shown in FIG. 1 as an example, the communication device may include a network device and a terminal device with a communication function, and the network device and the terminal device may be specific devices in this embodiment of the application, which will not be repeated here; It may include other devices in the communication system, for example, other network entities such as a network controller and a mobility management entity, which are not limited in this embodiment of the present application.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

It should be understood that the "instruction" mentioned in the embodiments of the present application may be a direct instruction, an indirect instruction, or an associated relationship. For example, if A indicates B, it can indicate that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indicates B indirectly, such as A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.

In the description of the embodiments of the present application, the term "corresponding" may indicate that there is a direct or indirect corresponding relationship between the two, or may indicate that there is an associated relationship between the two, or indicate and be instructed, configure and be instructed configuration, etc.

In order to facilitate the understanding of the technical solutions of the embodiments of the present application, the related technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, which all belong to the embodiments of the present application. protected range.

As shown in Figure 2, it is a (Proximity-Services, ProSe) UE-to-network relay (ProSe UE-to-network relay) system architecture in a 4G network. The remote terminal (Remote UE) is connected to the network relay (ProSe UE-to-Network Relay) through the PC5 interface, and the relay terminal is connected to the RAN (such as E-UTRA or NR base station, etc.) through the Uu interface. The UE accesses the EPC (Evolved Packet Core, evolved packet core network)/5GC (5G core network) through the N1 interface.

For the UE-to-network relay architecture of 5G, there are two possible architectures, L3 (Layer-3, Layer 3) architecture or L2 (Layer-2, Layer 2) architecture.

The main differences between L3 architecture and L2 architecture are as follows:

Under the L3 architecture, the remote (Remote) UE does not need to register with the network, and can only transmit data through a relay (Relay UE), such as a ProSe UE-to-network relay (ProSe UE-to-network relay), similar to Architecture under 4G network.

Under the L2 architecture, the remote UE is similar to the common UE, and the required procedures (eg, registration, session establishment) are all performed. However, data and signaling under the L2 architecture are transmitted to a base station such as an eNB through the relay UE.

In the process of ProSe UE to network relay in EPS (Evolved Packet System, Evolved Packet System), the relay UE can establish a new PDN connection for relay. In order to transmit the relay data of the remote UE, the relay UE needs to use a suitable public data network (Public Data Network, PDN) connection (connection). Which PDN connection to use to transmit relay data is decided by the relay UE. For example, the relay UE may use a dedicated PDN connection to transmit all relay data.

In the L3 architecture under the 5G network, the remote UE can also use a similar method to establish an appropriate PDU session (session) for transmitting the data of the remote UE. Exemplarily, the flow of uplink data may include: remote UE->relay UE->RAN->5GC->DNN->application server (Application server). Downward reverse.

In the 5G network, in order to save the power of the UE, the MICO (Mobile Initiated Connection Only, only the connection initiated by the mobile terminal) mode is introduced. The MICO mode is mainly for services that only have uplink data and no downlink data. In MICO mode, after the UE enters the idle state, the network will not page the UE, and the UE no longer needs to monitor the paging channel all the time, thereby achieving the effect of power saving.

When the UE needs to enter the MICO mode, the UE sends a registration request (Registration request) message to the AMF carrying the MICO indication (indication). An example of the format indicated by MICO is shown in Table 1 below. When the AMF agrees that the UE enters the MICO mode, the AMF carries the MICO indication in the Registration Accept message. Because the network is no longer paging the UE, the Registration Area (RA) no longer needs to be limited to the paging area and can become the entire PLMN. The UE does not need to perform a registration update (Registration update) with the AMF when it moves within the RA.

Table 1 MICO instructions

Among them, MICO indication IEI is the information element identification (Information Element Identification) indicated by MICO, RAAI is the registration area allocation indication (Registration Area Allocation Indication), when the value of RAAI is 1, it means that the registration area is the entire PLMN, and SPRTI is strictly periodic Registration Timer Indication (Strictly Periodic Registration Timer Indication), indicating whether strict periodic registration timer is supported, Spare means spare.

In addition, because some services need to reply a response message to the UE within a certain period of time after receiving the uplink data of the UE, it needs to be able to page to the UE within a certain period of time. In this case, the UE also provides an active time when requesting the MICO mode. The AMF determines the final activity time in combination with the UE's subscription information, local configuration information, etc., and sends it to the UE in the Registration Accept. After the UE enters the idle state, the active time starts and needs to monitor the paging channel before it expires. The network also considers the UE reachable during the active time.

If the Relay UE enters the MICO mode, the Remote UE can only send uplink data through the Relay UE, and the Remote UE may not be found by the network after the Relay UE enters the idle state. The relay method in the embodiment of the present application can implement relaying for the Remote UE through the Relay UE in the MICO mode.

FIG. 3 is a schematic flowchart of a relay method 200 according to an embodiment of the present application. The method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following.

S210. The first terminal receives a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the first terminal is a remote (Remote) terminal, and the second terminal is a relay (Relay) terminal. A power saving mode can also be a power saving mode. For example, the power saving mode may include a MICO mode, an eDRX (Extended DRX, enhanced discontinuous reception) mode, and the like.

Among them, in the MICO mode, after the terminal enters the idle state, if there is an active time (active time), after the active time expires, the network will not paging the terminal, and the terminal no longer needs to monitor the paging channel all the time, so as to save time. effect of electricity.

Optionally, in this embodiment of the present application, the first terminal receives the first indication, including:

The first terminal receives a discovery message from the second terminal, where the discovery message includes the first indication and the first timer.

Exemplarily, in a relay discovery mode, the second terminal may broadcast a discovery message, or may send a discovery message to one or more target terminals. After receiving the discovery message, the first terminal may determine whether to select the second terminal as a relay according to the discovery message.

Exemplarily, the first indication may indicate whether the second terminal supports or is in a power saving mode. The discovery message may also carry the first timer. If the first indication indicates whether the second terminal supports or is in MICO, the first timer may be an active time of the second terminal. If the first indication indicates whether the second terminal supports or is in eDRX, the first timer may be a paging time window (paging time window) of the second terminal.

Optionally, in this embodiment of the present application, the method further includes:

The first terminal sends a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the first terminal sends the second indication, including:

The first terminal sends a message for finding a relay, where the message for finding a relay includes the second indication and a second timer;

The first terminal receiving the first indication includes: the first terminal receiving a response message from the second terminal, where the response message includes the first indication and the first timer;

The second indication indicates that the first terminal is looking for a relay that supports or is in an energy-saving mode, and the first indication indicates that the second terminal supports or is in an energy-saving mode.

Exemplarily, in another relay discovery mode, the first terminal may broadcast a relay search message, and the first terminal may also send a relay search message to one or more target terminals. The Find Relay message may carry a second indication for indicating that the first terminal is looking for a relay that supports or is in a power saving mode. The second timer may also be carried in the Find Relay message. After receiving the relay search message, the second terminal can send a response message to the first terminal, and the first indication carried in the response message can inform the first terminal that the second terminal supports or is in an energy saving mode. The response message may also carry the first timer. After receiving the response message, the first terminal may determine whether to select the second terminal as a relay according to the response message.

Exemplarily, if the first indication is a MICO indication, the first timer may be an active time of the second terminal. If the second indication is a MICO indication, the second timer may be an active time of the first terminal. If the first indication is an eDRX indication, the first timer may be a paging time window of the second terminal. If the second indication is an eDRX indication, the second timer may be a paging time window of the first terminal.

The first terminal determines whether to select the second terminal as a relay based on at least one of the following:

whether the second terminal supports or is in an energy saving mode;

first timer;

second timer.

Exemplarily, based on whether the second terminal indicated by the first indication supports or is in an energy saving mode, the first terminal may determine whether to select the second terminal as a relay according to its own service requirements. For example, the first indication may indicate that the second terminal supports or is in the MICO mode, and the first terminal can select the second terminal as a relay when it does not need to perform downlink data transmission; In this case, the second terminal is not selected as the relay.

Exemplarily, if the first terminal has multiple second terminals that can be selected as relays, the selection can be made according to its own second timer and the first timer of each second terminal. For example, the second terminal to which the first timer that is closest to the second timer of the first terminal belongs is selected as the relay.

The first terminal sends a third indication to the second terminal selected as the relay, where the third indication is used to indicate whether to use the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the first terminal sends a third indication to the second terminal selected as the relay, including:

The first terminal sends a message for establishing a connection to the second terminal selected as a relay, where the message for establishing a connection includes the third indication.

Optionally, in this embodiment of the present application, the message for establishing a connection further includes the second timer.

Exemplarily, the first terminal sends a connection establishment request message to the second terminal selected as the relay, which includes a third indication indicating whether to use the PC5MICO mode. The second timer included in the connection establishment request message may be the activity time of the first terminal.

The first terminal receives a fourth indication from the second terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the first terminal receives a fourth indication from the second terminal, including:

The first terminal receives a message for accepting connection from the second terminal, where the message for accepting connection includes the fourth indication.

Exemplarily, the first terminal receives a connection establishment accept message from the second terminal, which includes a fourth indication indicating that the second terminal accepts the PC5MICO mode.

The first terminal sends a fifth indication to the second terminal, where the fifth indication is used to indicate that the first terminal enters the energy saving mode, and the fifth indication is that the first terminal uses its own non-access stratum (Non-Access Stratum) , NAS) is obtained by connecting the first access and the mobility management network element (AMF).

Optionally, in this embodiment of the present application, the first terminal sends a fifth indication to the second terminal, including:

The first terminal sends a message including the fifth indication and a third timer to the second terminal, where the third timer is obtained by the first terminal connecting to the first AMF through its own NAS.

Exemplarily, the first terminal may send an update message to the second terminal, where the update message carries a fifth indication for indicating that the first terminal enters the energy saving mode. The update message may also carry a third timer obtained by the first terminal from the AMF connected to itself. If the first terminal does not carry the second timer of the first terminal in the above-mentioned finding relay message, the update message may carry the third timer of the first terminal.

Exemplarily, at layer 2 (L2relay), the first terminal may connect to the AMF (ie, the first AMF) through its own NAS to acquire the third timer. For example, the first terminal connecting to the AMF can obtain the activity time of the first terminal in the MICO mode, or the first terminal connecting to the AMF can obtain the eDRX paging time window of the first terminal. At layer 3 (L2relay), the first terminal is not directly connected to the AMF, and the process of acquiring and sending the third timer may not be included.

The first terminal receives a message from the second terminal for accepting to update the fifth indication and the third timer.

Exemplarily, after receiving the update message, if the second terminal locally updates the fifth indication and the third timer, then returns an update accept message to the first terminal. For example, if the fifth indication is used to indicate that the first terminal enters the MICO mode, the third timer may be the active time of the first terminal.

The first terminal receives a sixth indication from the second terminal, where the sixth indication is used to indicate that the second terminal enters the energy saving mode, and the sixth indication is obtained by the second terminal from the second AMF.

Optionally, in this embodiment of the present application, the first terminal receives a sixth indication from the second terminal, including:

The first terminal receives a message including the sixth indication and the fourth timer from the second terminal, where the fourth timer is acquired by the second terminal from the second AMF.

Exemplarily, the second terminal can connect to the AMF (ie, the second AMF) as a relay. The second terminal may acquire the sixth indication from the second AMF through the registration process. During the registration process, the second terminal may send a registration request message to the AMF, and the registration request message may carry an indication of requesting to enter the energy saving mode. The registration request message may also carry a timer for requesting to enter the energy saving mode. The timer may be the maximum value of the first timer and the second timer, or the maximum value of the second timer and the third timer. If the AMF accepts the request of the second terminal, it may return a registration acceptance message to the second terminal, where the registration acceptance message may carry a sixth indication for indicating that the second terminal enters the energy saving mode. A fourth timer may also be carried in the registration acceptance message. The fourth timer and the timer carried in the registration request message may be the same or different, and are determined by the AMF.

Exemplarily, if the sixth indication is used to indicate that the second terminal enters the MICO mode, the fourth timer may indicate the activity time of the second terminal.

FIG. 4 is a schematic flowchart of a relay method 300 according to an embodiment of the present application. The method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least some of the following.

S310. The second terminal sends a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the second terminal sends the first indication, including:

The second terminal sends a discovery message, where the discovery message includes the first indication and the first timer.

The second terminal receives a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the second terminal receives the second indication, including:

The second terminal receives a message for finding a relay from the first terminal, where the message for finding a relay includes the second indication and a second timer;

Sending the first indication by the second terminal includes: the second terminal sending a response message to the first terminal, where the response message includes the first indication and the first timer;

Optionally, in the embodiments of the present application, the method further includes:

The second terminal receives a third indication from the first terminal, where the third indication is used to indicate whether to use the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the second terminal receives a third indication from the first terminal, including:

The second terminal receives a message for establishing a connection from the first terminal, where the message for establishing a connection includes the third indication.

The second terminal sends a fourth indication to the first terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the second terminal sends a fourth indication to the first terminal, including:

The second terminal sends a message for accepting connection to the first terminal, where the message for accepting connection includes the fourth indication.

The second terminal receives a fifth indication from the first terminal, where the fifth indication is used to indicate that the first terminal enters an energy saving mode, and the fifth indication is obtained by the first terminal connecting to the first AMF through its own NAS.

Optionally, in this embodiment of the present application, the second terminal receives a fifth indication from the first terminal, including:

The second terminal receives a message including the fifth indication and the third timer from the first terminal, where the third timer is obtained by the first terminal connecting to the first AMF through its own NAS.

The second terminal sends a message for registration when it needs to enter the power saving mode, where the message for registration includes a MICO indication and a maximum timer, or the message for registration includes enhanced discontinuous reception Extended DRX parameter.

Exemplarily, the second terminal can connect to the AMF (ie, the second AMF) as a relay. The second terminal may acquire the sixth indication from the second AMF through the registration process. During the registration process, the second terminal may send a registration request message to the AMF, and the registration request message may carry an indication of requesting to enter the energy saving mode. The registration request message may also carry a timer for requesting to enter the energy saving mode. If the AMF accepts the request of the second terminal, it may return a registration acceptance message to the second terminal, and the registration acceptance message may carry a sixth indication for indicating that the second terminal enters the energy saving mode. A fourth timer may also be carried in the registration acceptance message. The fourth timer and the timer carried in the registration request message may be the same or different, and are determined by the AMF.

Exemplarily, the registration request message includes the MICO indication and the maximum active time. The sixth indication included in the registration reception message returned by the AMF is used to indicate that the second terminal enters the MICO mode, and the fourth timer may indicate the activity time of the second terminal.

Exemplarily, the message for registration includes an enhanced discontinuous reception Extended DRX (may be referred to as eDRX for short) parameter, see Table 2 below for an example of IE (information element, information element) of the Extended DRX parameter.

Table 2 Extended DRX parameters

Optionally, in this embodiment of the present application, the maximum timer is the maximum value of the first timer and the second timer, or the maximum value of the second timer and the third timer.

Exemplarily, at layer 3, the maximum value of the first timer and the second timer may be used as the maximum timer. At layer 2, the maximum value of the first timer and the third timer may be taken as the maximum timer.

Optionally, in this embodiment of the present application, when the second terminal needs to enter the energy-saving mode, a message for registration is sent, including:

The second terminal sends the message for registration to the second AMF when it needs to enter the energy saving mode.

The second terminal receives a message for accepting registration from the second AMF, where the message for accepting registration includes a sixth indication and the fourth timer, where the sixth indication indicates that the second terminal enters an energy saving mode.

The second terminal sends the sixth indication to the first terminal, where the sixth indication is used to indicate that the second terminal enters the energy saving mode.

Optionally, in this embodiment of the present application, the second terminal sends the sixth indication to the first terminal, including:

The second terminal sends a message including the sixth indication and the fourth timer to the first terminal.

Optionally, in this embodiment of the present application, the first terminal may be a remote terminal, and the second terminal may be a relay terminal.

For a specific example of the second terminal executing method 300 in this embodiment, reference may be made to the relevant description of the second terminal, such as a relay terminal, in the foregoing method 200, which is not repeated here for brevity.

Example 1: The scheme of layer 3 (L3relay) is shown in FIG. 5 .

S11. The remote UE can use the following mode A or mode B to select the relay UE.

Mode A (Model A):

S11-1. The relay (Relay) UE sends a discovery message, which includes a MICO mode indication (first indication), which is used to indicate whether the Relay UE is in the MICO mode. The discovery message optionally contains the active time of the relay UE. The relay UE can use MICO by default, otherwise, the relay UE also includes whether to support MICO.

Mode B (Model B):

S11-21. The remote UE sends a Find Relay message. The search for relay message optionally includes whether to search for a relay in MICO mode (second indication), and its own activity time.

S11-22. The relay UE that supports MICO or is in MICO sends response information, which includes a MICO mode indication (the first indication), which is used to indicate whether the relay UE is in the MICO mode. Wherein, the response information optionally includes the activity time of the relay UE. The relay UE can use MICO by default, otherwise, the relay UE also includes whether to support MICO.

S12. The remote (Remote) UE decides whether to select the relay UE and establish a connection according to whether the relay UE is in the MICO mode and the active time. For example, if the remote UE needs to perform downlink data transmission, the relay UE that supports MICO or is in MICO is not selected. If the remote UE can accept the relay UE in MICO mode, and if there are multiple relay UEs to choose from, the active time of the relay UE can be selected to be the closest to its own.

The remote UE sends a connection establishment request message to the selected relay UE, which includes whether to use the PC5 MICO mode (third indication) and the activity time of the remote UE. Among them, the PC5 connection only transmits uplink data, and there is no downlink data from Relay to the remote.

S13. The relay UE sends a connection establishment accept message. Wherein the accept message optionally includes accepting the PC5 MICO mode indication (the fourth indication). If the relay UE accepts PC5MICO, the acceptance message does not contain QoS flow-related parameters, because the QoS flow parameters sent by the relay UE to the remote UE are used for downlink data transmission and are not required in PC5MICO mode.

S14. The relay UE takes the maximum value of the activity time of one or more remote UEs and its own activity time.

S15. When the relay UE needs to enter the MICO, it sends a registration request (Registration request) message to the AMF, where the registration request message includes the MICO indication and the activity time. The MICO indication is used to indicate that the relay UE requests to enter the MICO, and the active time can be the active time determined in step S14. If a new remote UE access results in a change in the activity time, the relay UE repeats this step.

S16. AMF replies with a Registration accept message. The registration acceptance message may contain the MICO indication (the sixth indication) and the activity time. The MICO indication may indicate that the AMF accepts the relay UE to enter the MICO. The activity time may be determined by the AMF based on the activity time received in the previous step and related configuration information.

S17. The relay UE sends a notification message to the remote UE to notify the remote UE that the relay UE enters the MICO mode.

In this example, the relay UE implements the relay service in the MICO mode, so as to achieve power saving of the relay UE and the remote UE.

Example 2: The scheme of layer 2 (L2relay) is shown in FIG. 6 .

S21 to S23 may be similar to S11 to S13 in the above example 1, and details are not described here. Wherein, in mode B, if the relay search message does not carry the activity time of the remote UE, the activity time of the remote UE may be carried in the subsequent update process.

S24. Since in layer 2 (L2relay), the remote UE needs to access the network and must first establish a PC5 connection with the relay UE, so the MICO mode cannot be entered when the connection establishment request is made, and the relay UE needs to be notified through subsequent signaling.

The remote UE can connect to the AMF through its own NAS. Therefore, when the remote UE needs to enter the MICO, the remote UE implements the interaction in the related technology, and can obtain the MICO indication and activity time from the AMF.

The remote UE sends an update request message to the relay UE, and the update request message includes an indication of requesting to enter the MICO mode and the active time obtained from the AMF.

S25. The relay UE replies with update acceptance information.

S26 to S29 may be similar to S14 to S17 in the above example 1, and will not be repeated here.

The embodiments of the present application are also applicable to terminal-to-terminal relay (UE-to-UE relay). Based on the above solution, a third terminal can be added as the destination terminal that the first terminal actually wants to transmit data. The second terminal determines its own timer according to the timers of the first and third terminals, and transmits it to its own AMF together with the instruction to enter the energy saving mode, and the AMF returns the sixth instruction and the fourth timer of the second terminal. The second terminal then notifies the first terminal and the third terminal of the fourth timer.

FIG. 7 is a schematic block diagram of a first terminal 400 according to an embodiment of the present application. The first terminal 400 may include:

The receiving unit 410 is configured to receive a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the receiving unit is further configured to receive a discovery message from the second terminal, where the discovery message includes the first indication and the first timer.

Optionally, in this embodiment of the present application, as shown in FIG. 8 , the first terminal further includes:

The sending unit 420 is configured to send a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the sending unit is further configured to send a message for finding a relay, where the message for finding a relay includes the second indication and the second timer;

The receiving unit is further configured to receive a response message from the second terminal, where the response message includes the first indication and the first timer;

Optionally, in this embodiment of the present application, the first terminal further includes:

A selection unit 430, configured to determine whether to select the second terminal as a relay based on at least one of the following:

whether the second terminal supports or is in an energy saving mode;

first timer;

second timer.

The connecting unit 440 is configured to send a third indication to the second terminal selected as the relay, where the third indication is used to indicate whether to use the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the connection unit is further configured to send a message for establishing a connection to the second terminal selected as the relay, where the message for establishing a connection includes the third indication.

Optionally, in this embodiment of the present application, the connection unit is further configured to receive a fourth indication from the second terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the connection unit is further configured to receive a message for accepting a connection from the second terminal, where the message for accepting a connection includes the fourth indication.

The updating unit 450 is configured to send a fifth indication to the second terminal, where the fifth indication is used to indicate that the first terminal enters the energy saving mode, and the fifth indication is that the first terminal connects to the first terminal through its own non-access stratum NAS. Obtained by the access and mobility management network element AMF.

Optionally, in this embodiment of the present application, the update unit is further configured to send a message including the fifth indication and a third timer to the second terminal, where the third timer is the first terminal through its own NAS Obtained by connecting to the first AMF.

Optionally, in this embodiment of the present application, the updating unit is further configured to receive a message from the second terminal for accepting to update the fifth indication and the third timer.

The notification unit 460 is configured to receive a sixth indication from the second terminal, where the sixth indication is used to indicate that the second terminal enters an energy saving mode, and the sixth indication is obtained by the second terminal from the second AMF.

Optionally, in this embodiment of the present application, the notification unit is further configured to receive a message from the second terminal including the sixth indication and the fourth timer, where the fourth timer is the second terminal from the second terminal. Acquired by the second AMF.

The first terminal 400 in this embodiment of the present application can implement the corresponding functions of the first terminal in the foregoing method embodiments. For the corresponding processes, functions, implementations, and beneficial effects of each module (sub-module, unit, or component, etc.) in the first terminal 400, reference may be made to the corresponding descriptions in the foregoing method embodiments, which will not be repeated here. It should be noted that the functions described by each module (submodule, unit, or component, etc.) in the first terminal 400 of the application embodiment may be implemented by different modules (submodule, unit, or component, etc.), or by the same module. A module (submodule, unit or component, etc.) implementation.

FIG. 9 is a schematic block diagram of a second terminal 500 according to an embodiment of the present application. The second terminal 500 may include:

The sending unit 510 is configured to send a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the sending unit is further configured to send a discovery message, where the discovery message includes the first indication and the first timer.

Optionally, in this embodiment of the present application, as shown in FIG. 10 , the second terminal further includes:

The receiving unit 520 is configured to receive a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.

Optionally, in this embodiment of the present application, the receiving unit 520 is further configured to receive a message for finding a relay from the first terminal, where the message for finding a relay includes the second indication and the second timer;

The sending unit is further configured to send a response message to the first terminal, where the response message includes the first indication and the first timer;

Optionally, in this embodiment of the present application, the second terminal further includes:

The connection unit 530 is configured to receive a third indication from the first terminal, where the third indication is used to indicate whether to use the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the connection unit is further configured to receive a message for establishing a connection from the first terminal, where the message for establishing a connection includes the third indication.

Optionally, in this embodiment of the present application, the connection unit is further configured to send a fourth indication to the first terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.

Optionally, in this embodiment of the present application, the connection unit is further configured to send a message for accepting connection to the first terminal, where the message for accepting connection includes the fourth indication.

The updating unit 540 is configured to receive a fifth indication from the first terminal, where the fifth indication is used to indicate that the first terminal enters an energy saving mode, and the fifth indication is obtained by the first terminal connecting to the first AMF through its own NAS of.

Optionally, in this embodiment of the present application, the update unit is further configured to receive a message from the first terminal including the fifth indication and the third timer, where the third timer is the first terminal through its own The NAS is connected to the first AMF obtained.

The registration unit 550 is configured to send a message for registration when it is necessary to enter the energy saving mode, where the message for registration includes MICO indication and a maximum timer, or the message for registration includes enhanced discontinuous reception Extended DRX parameter.

Optionally, in this embodiment of the present application, the maximum timer is the maximum value of the first timer and the second timer, or the maximum value of the first timer and the third timer.

Optionally, in this embodiment of the present application, the registration unit is further configured to send the message for registration to the second AMF when the energy saving mode needs to be entered.

Optionally, in this embodiment of the present application, the registration unit is further configured to receive a message for accepting registration from the second AMF, where the message for accepting registration includes a sixth indication and the fourth timer, The sixth indication indicates that the second terminal enters the energy saving mode.

The notification unit 560 is configured to send the sixth indication to the first terminal, where the sixth indication is used to indicate that the second terminal enters the energy saving mode.

Optionally, in this embodiment of the present application, the notification unit is further configured to send a message including the sixth indication and the fourth timer to the first terminal.

The second terminal 500 in this embodiment of the present application can implement the corresponding functions of the second terminal in the foregoing method embodiments. For the corresponding processes, functions, implementations, and beneficial effects of each module (sub-module, unit, or component, etc.) in the second terminal 500, reference may be made to the corresponding descriptions in the foregoing method embodiments, which will not be repeated here. It should be noted that the functions described by each module (submodule, unit, or component, etc.) in the second terminal 500 of the application embodiment may be implemented by different modules (submodule, unit, or component, etc.), or by the same module. A module (submodule, unit or component, etc.) implementation.

FIG. 11 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application. The communication device 600 includes a processor 610, and the processor 610 can call and run a computer program from a memory, so that the communication device 600 implements the methods in the embodiments of the present application.

Optionally, as shown in FIG. 11 , the communication device 600 may further include a memory 620 . The processor 610 may call and run a computer program from the memory 620, so that the communication device 600 implements the methods in the embodiments of the present application.

The memory 620 may be a separate device independent of the processor 610 , or may be integrated in the processor 610 .

Optionally, as shown in FIG. 11 , the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send information or data to other devices, or receive other devices Information or data sent by a device.

Among them, the transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include antennas, and the number of the antennas may be one or more.

Optionally, the communication device 600 may be a terminal device in an embodiment of the present application, such as the above-mentioned first terminal or second terminal, and the communication device 600 may implement the corresponding processes implemented by the terminal device in each method in the embodiments of the present application. , and are not repeated here for brevity.

Optionally, the communication device 600 may be the network device of this embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application, which is not repeated here for brevity.

FIG. 12 is a schematic structural diagram of a chip 700 according to an embodiment of the present application. The chip 700 includes a processor 710, and the processor 710 can call and run a computer program from a memory, so as to implement the method in the embodiments of the present application.

Optionally, as shown in FIG. 12 , the chip 700 may further include a memory 720 . The processor 710 may call and run a computer program from the memory 720 to implement the method executed by the terminal device or the network device in the embodiment of the present application.

The memory 720 may be a separate device independent of the processor 710 , or may be integrated in the processor 710 .

Optionally, the chip 700 may further include an input interface 730 . The processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may acquire information or data sent by other devices or chips.

Optionally, the chip 700 may further include an output interface 740 . The processor 710 can control the output interface 740 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.

Optionally, the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiment of the present application, which is not repeated here for brevity.

Optionally, the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application, which is not repeated here for brevity.

Chips applied to network equipment and terminal equipment can be the same chip or different chips.

It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip, a system-on-chip, or a system-on-a-chip, or the like.

The above-mentioned processor may be a general-purpose processor, a digital signal processor (DSP), an off-the-shelf programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC) or Other programmable logic devices, transistor logic devices, discrete hardware components, etc. The general-purpose processor mentioned above may be a microprocessor or any conventional processor or the like.

The memory mentioned above may be either volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM).

It should be understood that the above memory is an example but not a limitative description, for example, the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

FIG. 13 is a schematic block diagram of a communication system 800 according to an embodiment of the present application. The communication system 800 includes a first terminal 810 and a second terminal 820 .

The first terminal 810 is configured to receive a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

The second terminal 820 is configured to send a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.

The first terminal 810 may be a remote terminal, and the second terminal 820 may be a relay terminal. The first terminal 810 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the second terminal 820 can be used to implement the corresponding functions implemented by the network device in the above method. For brevity, details are not repeated here.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. 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, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored on or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted over a wire from a website site, computer, server or data center (eg coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (eg infrared, wireless, microwave, etc.) means to another website site, computer, server or data center. The computer-readable storage medium can be any available medium 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 available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a Solid State Disk (SSD)), and the like.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above may refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art who is familiar with the technical scope disclosed in the present application can easily think of changes or substitutions. Covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A relay method comprising:

The first terminal receives a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.
The method of claim 1, wherein receiving the first indication by the first terminal comprises:

The first terminal receives a discovery message from the second terminal, where the discovery message includes the first indication and the first timer.
The method of claim 1, further comprising:

The first terminal sends a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.
The method according to claim 3, wherein the first terminal sends the second indication, comprising:

sending, by the first terminal, a message for finding a relay, where the message for finding a relay includes the second indication and a second timer;

The first terminal receiving the first indication includes: the first terminal receiving a response message from the second terminal, where the response message includes the first indication and a first timer;

The second indication indicates that the first terminal is looking for a relay that supports or is in an energy-saving mode, and the first indication indicates that the second terminal supports or is in an energy-saving mode.
The method of any one of claims 1 to 4, wherein the method further comprises:

The first terminal determines whether to select the second terminal as a relay based on at least one of the following:

whether the second terminal supports or is in an energy saving mode;

first timer;

second timer.
The method of claim 5, wherein the method further comprises:

The first terminal sends a third indication to the second terminal selected as the relay, where the third indication is used to indicate whether to use the PC5 energy saving mode.
The method according to claim 6, wherein the first terminal sends a third indication to the second terminal selected as the relay, comprising:

The first terminal sends a message for establishing a connection to the second terminal selected as a relay, where the message for establishing a connection includes the third indication.
The method of claim 7, wherein the message for establishing a connection further includes the second timer.
The method of any one of claims 6 to 8, wherein the method further comprises:

The first terminal receives a fourth indication from the second terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.
The method of claim 9, wherein the first terminal receives a fourth indication from the second terminal, comprising:

The first terminal receives a message for accepting connection from the second terminal, where the message for accepting connection includes the fourth indication.
The method according to claim 6 or 7, wherein the method further comprises:

The first terminal sends a fifth indication to the second terminal, where the fifth indication is used to indicate that the first terminal enters the energy-saving mode, and the fifth indication is that the first terminal uses its own non-access The layer NAS is obtained by connecting the first access and the mobility management network element AMF.
The method of claim 11, wherein the first terminal sends a fifth indication to the second terminal, comprising:

The first terminal sends a message including the fifth indication and a third timer to the second terminal, where the third timer is obtained by the first terminal connecting to the first AMF through its own NAS.
The method of claim 12, wherein the method further comprises:

The first terminal receives a message from the second terminal for accepting to update the fifth indication and the third timer.
The method of any one of claims 6 to 13, wherein the method further comprises:

The first terminal receives a sixth indication from the second terminal, where the sixth indication is used to indicate that the second terminal enters an energy saving mode, and the sixth indication is obtained by the second terminal from the second AMF of.
The method of claim 14, wherein the first terminal receives a sixth indication from the second terminal, comprising:

The first terminal receives a message from the second terminal including the sixth indication and a fourth timer, where the fourth timer is acquired by the second terminal from the second AMF.
A relay method comprising:

The second terminal sends a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.
The method according to claim 16, wherein sending the first indication by the second terminal comprises:

The second terminal sends a discovery message, where the discovery message includes the first indication and the first timer.
The method of claim 16, further comprising:

The second terminal receives a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy saving mode.
The method according to claim 18, wherein the second terminal receiving the second indication comprises: the first terminal receiving a message for finding a relay from the first terminal, the message for finding a relay The message includes the second indication and the second timer;

Sending the first indication by the second terminal includes: the second terminal sending a response message to the first terminal, where the response message includes the first indication and a first timer;

The second indication indicates that the first terminal is looking for a relay that supports or is in an energy-saving mode, and the first indication indicates that the second terminal supports or is in an energy-saving mode.
The method of any one of claims 16 to 19, wherein the method further comprises:

The second terminal receives a third indication from the first terminal, where the third indication is used to indicate whether to use the PC5 energy saving mode.
The method of claim 20, wherein the second terminal receives a third indication from the first terminal, comprising:

The second terminal receives a message for establishing a connection from the first terminal, where the message for establishing a connection includes the third indication.
The method of claim 21, wherein the message for establishing a connection further includes a second timer.
The method of claim 21 or 22, wherein the method further comprises:

The second terminal sends a fourth indication to the first terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode.
The method of claim 23, wherein the second terminal sends a fourth indication to the first terminal, comprising:

The second terminal sends a message for accepting connection to the first terminal, where the message for accepting connection includes the fourth indication.
The method of claim 24, wherein the method further comprises:

The second terminal receives a fifth indication from the first terminal, where the fifth indication is used to indicate that the first terminal enters an energy-saving mode, and the fifth indication is that the first terminal is connected through its own NAS Obtained by the first AMF.
The method of claim 25, wherein the second terminal receives a fifth indication from the first terminal, comprising:

The second terminal receives a message including the fifth indication and a third timer from the first terminal, where the third timer is obtained by the first terminal connecting to the first AMF through its own NAS.
The method of any one of claims 20 to 26, wherein the method further comprises:

The second terminal sends a message for registration when it needs to enter the energy saving mode, the message for registration includes MICO indication and a maximum timer, or the message for registration includes enhanced discontinuous Receive Extended DRX parameters.
The method of claim 27, wherein the maximum timer is the maximum value of the first timer and the second timer, or the first timer and the third timer the maximum value in .
The method according to claim 27 or 28, wherein the second terminal sends a message for registration when it needs to enter an energy saving mode, comprising:

The second terminal sends the message for registration to the second AMF when it needs to enter the energy saving mode.
The method of claim 29, wherein the method further comprises:

The second terminal receives a message for accepting registration from the second AMF, the message for accepting registration includes a sixth indication and a fourth timer, and the sixth indication indicates that the second terminal Enter energy saving mode.
The method of claim 30, wherein the method further comprises:

The second terminal sends the sixth indication to the first terminal, where the sixth indication is used to indicate that the second terminal enters an energy saving mode.
The method of claim 31, wherein the second terminal sends the sixth indication to the first terminal, comprising:

The second terminal sends a message including the sixth indication and a fourth timer to the first terminal.
A first terminal, comprising:

A receiving unit, configured to receive a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.
The first terminal according to claim 33, wherein the receiving unit is further configured to receive a discovery message from the second terminal, wherein the discovery message includes the first indication and the first timer.
The first terminal of claim 33, wherein the first terminal further comprises:

A sending unit, configured to send a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy-saving mode.
The first terminal according to claim 35, wherein the sending unit is further configured to send a message for finding a relay, and the message for finding a relay includes the second indication and a second timer ;

The receiving unit is further configured to receive a response message from the second terminal, where the response message includes the first indication and the first timer;

The second indication indicates that the first terminal is looking for a relay that supports or is in an energy-saving mode, and the first indication indicates that the second terminal supports or is in an energy-saving mode.
The first terminal according to any one of claims 33 to 36, wherein the first terminal further comprises:

A selection unit, configured to determine whether to select the second terminal as a relay based on at least one of the following:

whether the second terminal supports or is in an energy saving mode;

first timer;

second timer.
The first terminal of claim 37, wherein the first terminal further comprises:

The connection unit is configured to send a third indication to the second terminal selected as the relay, where the third indication is used to indicate whether to use the PC5 energy saving mode.
The first terminal according to claim 38, wherein the connecting unit is further configured to send a message for establishing a connection to the second terminal selected as a relay, wherein the message for establishing a connection includes the first Three instructions.
The first terminal of claim 39, wherein the message for establishing a connection further includes the second timer.
The first terminal according to any one of claims 38 to 40, wherein the connecting unit is further configured to receive a fourth indication from the second terminal, wherein the fourth indication is used to indicate the second The terminal accepts the PC5 power saving mode.
The first terminal according to claim 41, wherein the connecting unit is further configured to receive a message for accepting connection from the second terminal, the message for accepting connection including the fourth indication .
The first terminal according to claim 38 or 37, wherein the first terminal further comprises:

an update unit, configured to send a fifth indication to the second terminal, where the fifth indication is used to indicate that the first terminal enters an energy saving mode, and the fifth indication is that the first terminal uses its own non-access The layer NAS is obtained by connecting the first access and the mobility management network element AMF.
The first terminal according to claim 43, wherein the updating unit is further configured to send a message including the fifth indication and a third timer to the second terminal, the third timer being the Obtained by the first terminal connecting to the first AMF through its own NAS.
The first terminal according to claim 44, wherein the updating unit is further configured to receive a message from the second terminal for accepting to update the fifth indication and the third timer.
The first terminal according to any one of claims 38 to 45, wherein the first terminal further comprises:

a notification unit, configured to receive a sixth indication from the second terminal, where the sixth indication is used to indicate that the second terminal enters an energy saving mode, and the sixth indication is obtained by the second terminal from the second AMF of.
The first terminal according to claim 46, wherein the notification unit is further configured to receive a message including the sixth indication and a fourth timer from the second terminal, the fourth timer being the obtained by the second terminal from the second AMF.
A second terminal, comprising:

A sending unit, configured to send a first indication, where the first indication is used to indicate whether the second terminal supports or is in an energy saving mode.
The second terminal according to claim 48, wherein the sending unit is further configured to send a discovery message, wherein the discovery message includes the first indication and the first timer.
The second terminal of claim 48, the second terminal further comprising:

A receiving unit, configured to receive a second indication, where the second indication is used to indicate whether the first terminal is looking for a relay that supports or is in an energy-saving mode.
The second terminal according to claim 50, wherein the receiving unit is further configured to receive a message for finding a relay from the first terminal, wherein the message for finding a relay includes the second indication and the second timer;

The sending unit is further configured to send a response message to the first terminal, where the response message includes the first indication and the first timer;

The second indication indicates that the first terminal is looking for a relay that supports or is in an energy-saving mode, and the first indication indicates that the second terminal supports or is in an energy-saving mode.
The second terminal according to any one of claims 48 to 51, wherein the second terminal further comprises:

The connection unit is configured to receive a third indication from the first terminal, where the third indication is used to indicate whether to use the PC5 energy saving mode.
The second terminal according to claim 52, wherein the connecting unit is further configured to receive a message for establishing a connection from the first terminal, wherein the message for establishing a connection includes the third indication .
The second terminal according to claim 53, wherein the message for establishing a connection further includes a second timer.
The second terminal according to claim 53 or 54, wherein the connecting unit is further configured to send a fourth indication to the first terminal, where the fourth indication is used to indicate that the second terminal accepts the PC5 energy saving mode .
The second terminal according to claim 55, wherein the connecting unit is further configured to send a message for accepting connection to the first terminal, wherein the message for accepting connection includes the fourth indication.
The second terminal of claim 56, wherein the second terminal further comprises:

an update unit, configured to receive a fifth indication from the first terminal, where the fifth indication is used to indicate that the first terminal enters an energy-saving mode, and the fifth indication is that the first terminal is connected through its own NAS Obtained by the first AMF.
The second terminal according to claim 57, wherein the updating unit is further configured to receive a message including the fifth indication and a third timer from the first terminal, the third timer being the The first terminal is obtained by connecting to the first AMF through its own NAS.
The second terminal according to any one of claims 52 to 58, wherein the second terminal further comprises:

a registration unit, configured to send a message for registration when it is necessary to enter the energy saving mode, the message for registration includes MICO indication and a maximum timer, or the message for registration includes enhanced discontinuous Receive Extended DRX parameters.
The second terminal according to claim 59, wherein the maximum timer is a maximum value of the first timer and the second timer, or the first timer and the third timer The maximum value in the timer.
The second terminal according to claim 59 or 60, wherein the registration unit is further configured to send the message for registration to the second AMF under the condition that the energy saving mode needs to be entered.
The second terminal according to claim 61, wherein the registration unit is further configured to receive a message for accepting registration from the second AMF, wherein the message for accepting registration includes a sixth indication and a first Four timers, and the sixth indication indicates that the second terminal enters an energy saving mode.
The second terminal of claim 62, wherein the second terminal further comprises:

a notification unit, configured to send the sixth indication to the first terminal, where the sixth indication is used to indicate that the second terminal enters an energy saving mode.
The second terminal according to claim 63, wherein the notification unit is further configured to send a message including the sixth indication and the fourth timer to the first terminal.
A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, so that the terminal device performs the execution of claims 1 to 15 The method of any of the above.
A terminal device, comprising: a processor and a memory, the memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory, so that the terminal device executes the computer program as claimed in claims 16 to 32 The method of any of the above.
A chip, comprising: a processor for invoking and running a computer program from a memory, so that a device on which the chip is installed executes the method according to any one of claims 1 to 15.
A chip, comprising: a processor for invoking and running a computer program from a memory, so that a device on which the chip is installed executes the method as claimed in any one of claims 16 to 32.
A computer-readable storage medium for storing a computer program which, when executed by a device, causes the device to perform the method of any one of claims 1 to 15.
A computer-readable storage medium for storing a computer program which, when executed by a device, causes the device to perform the method of any one of claims 16 to 32.
A computer program product comprising computer program instructions that cause a computer to perform the method of any one of claims 1 to 15.
A computer program product comprising computer program instructions that cause a computer to perform the method of any of claims 16 to 32.
A computer program that causes a computer to perform the method of any one of claims 1 to 15.
A computer program that causes a computer to perform the method of any one of claims 16 to 32.