Wireless communication method, user equipment and network device

Abstract

Provided are a wireless communication method, a user equipment (UE) and a network device. The method comprises: a remote UE sending a request message to a first relay UE, wherein the request message is used for requesting, from the first relay UE, a first message which is sent by a network device. The introduction of a request message facilitates a remote UE in obtaining a message, which is sent by a network device.

Description

Wireless communication method, user equipment, and network equipment Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a wireless communication method, user equipment (UE) and network equipment. Background Art

[0002] In a UE-to-network relay (U2N relay) scenario, how a remote UE should obtain a message sent by a network device is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method, user equipment, and network equipment. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, comprising: a remote UE sends a request message to a first relay UE, wherein the request message is used to request a first message sent by a network device to the first relay UE.

[0006] In a second aspect, a method for wireless communication is provided, including: a first relay UE receives a request message sent by a remote UE, where the request message is used to request a first message sent by a network device to the first relay UE.

[0007] According to a third aspect, a method for wireless communication is provided, comprising: a network device receives a request message sent by a remote UE through one or more relay UEs, wherein the request message is used to request a first message sent by the network device to a first relay UE among the one or more relay UEs.

[0008] According to a fourth aspect, a UE is provided, which is a remote UE and includes: a communication module for sending a request message to a first relay UE, wherein the request message is used to request a first message sent by a network device to the first relay UE.

[0009] In a fifth aspect, a UE is provided, which is a first relay UE, and the first relay UE includes: a communication module, used to receive a request message sent by a remote UE, and the request message is used to request the first relay UE to send a first message from a network device.

[0010] In the sixth aspect, a network device is provided, including: a communication module, used to receive a request message sent by a remote UE through one or more relay UEs, and the request message is used to request the first relay UE among the one or more relay UEs to send a first message sent by the network device.

[0011] In the seventh aspect, a UE is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send a signal so that the UE executes the method described in the first aspect or the second aspect.

[0012] In an eighth aspect, a network device is provided, comprising a transceiver, a memory, and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the network device executes the method described in the third aspect.

[0013] In a ninth aspect, a device is provided, comprising a processor for calling a program from a memory so that the device executes the method described in the first aspect, the second aspect or the third aspect.

[0014] In a tenth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect, the second aspect or the third aspect.

[0015] In an eleventh aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect, the second aspect or the third aspect.

[0016] In the twelfth aspect, a computer program product is provided, characterized in that it includes a program, and the program enables a computer to execute the method described in the first aspect, the second aspect or the third aspect.

[0017] In a thirteenth aspect, a computer program is provided, wherein the computer program enables a computer to execute the method as described in the first aspect, the second aspect or the third aspect.

[0018] In the embodiment of the present application, the remote UE sends a request message to the relay UE to request the message sent by the network device. The introduction of the request message helps the remote UE obtain the message sent by the network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0020] FIG2A is an example diagram of a possible resource allocation method in a sideline communication scenario.

[0021] FIG2B is an example diagram of another possible resource allocation method in a sideline communication scenario.

[0022] FIG3 is a flow chart of a wireless communication method according to an embodiment of the present application.

[0023] FIG4 is a flow chart of a possible implementation of the method shown in FIG3 .

[0024] FIG5 is a flow chart of another possible implementation of the method shown in FIG3 .

[0025] FIG6 is a flow chart of another possible implementation of the method shown in FIG3 .

[0026] FIG7 is a schematic structural diagram of a UE provided in one embodiment of the present application.

[0027] FIG8 is a schematic structural diagram of a UE provided in another embodiment of the present application.

[0028] FIG9 is a schematic diagram of the structure of a network device provided in an embodiment of the present application.

[0029] FIG10 is a schematic diagram of a device according to an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solution in this application will be described below with reference to the accompanying drawings.

[0031] Wireless communication systems

[0032] FIG1 is a diagram illustrating an example system architecture of a wireless communication system 100 to which an embodiment of the present application may be applied. The wireless communication system 100 may include a network device 110 and a UE 120. The network device 110 may be a device that communicates with the UE 120. The network device 110 may provide network coverage for a specific geographic area and may communicate with the UE 120 located within the coverage area. The UE 120 may access a network (e.g., a wireless network) through the network device 110. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0033] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the fifth generation (5G) system or NR, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0034] The UE in the embodiments of the present application may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The UE in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device or an in-vehicle device with wireless connection capabilities. The UE in the embodiments of the present application can be a mobile phone, a tablet, a laptop, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in vehicle to everything (V2X) or device to device (D2D). For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through a base station.

[0035] The network device in the embodiment of the present application may be a device for communicating with a UE. The network device may be, for example, an access network device or a wireless access network device. For example, the network device may be a base station. The base station may broadly cover the following various names, or be replaced with the following names: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmitting point (TP), home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof.

[0036] LTE D2D / V2X

[0037] UEs can communicate with each other via sidelinks, which are also known as proximity services (ProSe) communication, unilateral communication, sidelink communication, and device-to-device (D2D) communication.

[0038] D2D communication is different from the way in which communication data is received or sent through network devices in traditional cellular systems. Instead, it adopts the method of direct UE-to-UE communication, so it has higher spectrum efficiency and lower transmission delay. The 3rd generation partnership project (3GPP) defines two transmission modes: Mode A and Mode B. Figure 2A exemplarily shows Mode A of the sidelink transmission technology. In Mode A, the transmission resources of UE 120 are allocated by the network device 110, and UE 120 sends data on the sidelink according to the resources allocated by the network device. The network device 110 can allocate resources for a single transmission to UE 120, or allocate resources for semi-static transmission to UE 120. Figure 2B exemplarily shows Mode B of the sidelink transmission technology. In Mode B, UE 120 selects resources from the resource pool for data transmission.

[0039] In 3GPP, D2D is divided into the following different phases for research.

[0040] Phase 1: ProSe. In Rel-12 / 13, D2D communication was studied within the ProSe project. ProSe primarily targets public safety services. In ProSe, resource pools can be configured in the time domain. For example, by discontinuously arranging resource pools in the time domain, this allows the UE to transmit and receive data discontinuously on the sidelink, thereby saving power.

[0041] Phase 2: V2X. Rel-14 / 15 research focused on vehicle-to-everything (V2X) communication scenarios, primarily targeting relatively high-speed vehicle-to-vehicle and vehicle-to-pedestrian communications. In V2X systems, UE power efficiency is less of a concern due to the continuous power supply provided by the onboard systems. The primary challenge is data transmission latency, which necessitates continuous transmission and reception by the UE in the system design.

[0042] Phase 3: Wearable Devices to Devices (FeD2D). In Rel-14, research was conducted on scenarios where wearable devices access network equipment through UEs (such as mobile phones). This research primarily focused on low-speed and low-power access scenarios. During the pre-research phase of FeD2D, 3GPP concluded that network equipment could configure discontinuous reception (DRX) parameters for remote UEs through a relay UE. However, 3GPP did not elaborate on the details of how DRX configuration would be performed.

[0043] Phase 4: Multi-carrier. Rel-15 LTE V2X introduces a multi-carrier mechanism. This mechanism allows the UE to support packet segmentation, transmitting packets across multiple carriers to improve data transmission rates. Alternatively, the UE can replicate packets, splitting the same packet into multiple (e.g., two) packets. The UE can then transmit these packets separately across multiple carriers, improving transmission reliability.

[0044] For data packet duplication, V2X supports UE to perform sidelink data packet duplication (or sidelink packet duplication) at the packet data convergence protocol (PDCP) layer. For example, a PDCP packet data unit (PDU) can be duplicated (PDCP duplication) at the PDCP entity. Then, two packet data protocol (PDP) PDUs duplicated by the same PDCP entity are submitted to two different radio link control (RLC) entities and associated with two different sidelink logical channels. Different PDP PDUs duplicated by the same PDCP entity are only allowed to be transmitted on different sidelink carriers.

[0045] The UE may activate or deactivate the packet replication functionality of the sidelink based on (pre-)configuration. Sidelink packet replication is not applicable to transmissions with the Rel-14 transmission profile (see TS 23.285). The ProSe per-packet reliability (PPPR) value for proximity services supporting sidelink packet replication may be (pre-)configured via a PPPR threshold. For both the UE autonomous resource selection mode and the network device scheduling-based resource allocation mode, the UE shall perform sidelink packet replication for packets with the configured PPPR value until the configuration of the packet replication corresponding to the PPPR value is canceled. In addition, for the network device scheduling-based resource allocation mode, the UE may report the data volume of packets associated with one or more PPPR values ​​and the destinations of these packets via a sidelink buffer status report (BSR). The mapping of PPPR values ​​to logical channel groups may be configured by the network device, and the PPPR value is reflected by the logical channel group identity (ID) associated with the PPPR value contained in the sidelink BSR. A list of one or more PPPR values ​​may be reported by a UE in a radio resource control (RRC) connection in sidelink UE information.

[0046] NR V2X

[0047] Based on LTE V2X, NR V2X is not limited to broadcast scenarios, but has been further expanded to unicast and multicast scenarios, and the application of V2X is studied in these scenarios.

[0048] Similar to LTE V2X, NR V2X also defines two resource allocation modes: Mode 1 and Mode 2. Furthermore, the UE may be in a mixed mode. That is, the UE can acquire resources based on Mode 1 as well as Mode 2. The resource acquisition method can be indicated by a sidelink authorization. For example, the sidelink authorization can be used to indicate the time-frequency position of the physical sidelink control channel (PSCCH) and the physical sidelink shared channel (PSSCH) resources.

[0049] Unlike LTE V2X, NR V2X introduces feedback-based HARQ retransmissions in addition to the UE-initiated, feedback-free hybrid automatic repeat request (HARQ) retransmissions. Feedback-based HARQ retransmissions can be applied to both unicast and multicast communications.

[0050] Similar to LTE V2X, power efficiency is not a major issue for NR V2X due to the continuous power supply capability of the onboard system. The main issue for NR V2X is data transmission latency. Therefore, the NR V2X system design requires the UE to continuously transmit and receive data.

[0051] The UE in sidelink communication will trigger the RRC reconfiguration process of the sidelink in one or more of the following scenarios: releasing the sidelink data bearer in unicast communication; establishing the sidelink data bearer in unicast communication; modifying the relevant configuration of the sidelink data bearer in unicast communication; releasing the PC5 relay RLC channel between the layer 2 relay UE and the remote UE in the U2N relay scenario; establishing the PC5 relay RLC channel between the layer 2 relay UE and the remote UE in the U2N relay scenario; modifying the configuration parameters related to the PC5 relay RLC channel between the layer 2 relay UE and the remote UE in the U2N relay scenario; reconfiguration of NR sidelink measurement reporting related parameters; reconfiguration of sidelink channel state information (CSI) reference signal resources and CSI reporting delay boundaries; reconfiguration of sidelink DRX for the opposite UE.

[0052] U2N relay

[0053] The remote UE performs measurement reporting and includes information such as the relay UE identifier, serving cell identifier, and reference signal receiving power (RSRP) measurement value in the measurement reporting information. When the remote UE performs a link switch from a non-direct path to a direct path, the sidelink reference signal receiving power (SL-RSRP) can be used to perform measurements on the sidelink. When the remote UE performs a link switch from a direct path to a non-direct path, the sidelink discovery reference signal receiving power (SL-RSRP) can be used to perform measurements on the sidelink. In addition, when performing measurement reporting, two new measurement reporting triggering events are defined for the switch from the UE to the relay UE of the network:

[0054] Event 1: When the link quality of the relay UE is lower than the configured threshold, and, optionally, the link quality of the neighboring cell is higher than the configured threshold, the remote UE performs measurement reporting;

[0055] Event 2: When the link quality of the serving cell is lower than the configured threshold, and, optionally, the link quality of the relay UE is higher than the configured threshold, the remote UE performs measurement reporting.

[0056] In addition, to assist the remote UE in performing a direct-to-indirect link handover, a new timer is introduced. When the remote UE receives an RRC reconfiguration message indicating a direct-to-indirect link handover, it starts the timer. When the timer expires, the remote UE performs an RRC re-establishment.

[0057] In U2N relay, the network device will configure the bearer identifier for the remote UE and the relay UE for end-to-end data transmission of the relay UE. In addition, the network device will additionally configure the bearer parameters on the PC5 interface between the relay UE and the remote UE. At the same time, in the configuration of the sidelink relay adaptation protocol (SRAP) layer, the network device will map the bearer identifier with the PC5 RLC channel identifier (PC5 RLC channel ID) (see SL-SRAP-Config information element and SL-RLC-ChannelConfig information element below). The relay UE can understand the specific configuration information used by the remote UE through the PC5 RLC channel identifier. However, the relay UE cannot understand the specific information of the QoS of the corresponding service transmitted by the remote UE using this configuration information.

[0058] In a U2N relay scenario, a remote UE sometimes wishes to obtain messages (such as system messages and / or paging messages) sent by a network device. However, there is currently no suitable solution for how the remote UE should obtain the messages sent by the network device.

[0059] To address the above issues, in an embodiment of the present application, referring to step S310 in Figure 3 , the remote UE sends a request message to the first relay UE to request the message sent by the network device. The introduction of the request message helps the remote UE obtain the message sent by the network device.

[0060] In some embodiments, the first message may include one or more of the following: a first system message and a first paging message.

[0061] In some embodiments, if the first message includes a first system message, the request message may include indication information for indicating the type of the system message. For example, the indication information may indicate that the first system message is a system information block 1 (SIB1) or SIB2.

[0062] In some embodiments, if the first message includes a first paging message, the request message may include indication information for indicating one or more of the following: an identifier of a UE associated with the first paging message; and a length of a paging cycle of the first paging message.

[0063] In some embodiments, the method of Figure 3 may further include step S320, where the remote UE receives a first message sent by the first relay UE. For example, the first relay UE may obtain the first message from the network device and then forward the first message to the remote UE.

[0064] In some embodiments, the remote UE may be connected to the network device via a relay UE.

[0065] In some embodiments, the remote UE may be connected to the network device via a multi-hop relay UE. This connection scenario is hereinafter referred to as a multi-hop relay scenario.

[0066] In some embodiments, the remote UE may establish multiple connections with a network device (which may be one network device or multiple network devices) through multiple relay UEs. This connection scenario is hereinafter referred to as a multi-path relay scenario.

[0067] In some embodiments, the network device may receive the request message sent by the remote UE through one or more relay UEs. The one or more relay UEs may include not only the first relay UE mentioned above, but also other relay UEs.

[0068] In combination with the first embodiment and the second embodiment, detailed examples are given below to illustrate how the remote UE obtains the first message in a multi-hop relay scenario and a multi-path relay scenario, respectively.

[0069] Example 1: Multi-hop relay scenario

[0070] Example 1.1: The first relay UE is a relay UE adjacent to the remote UE in a multi-hop relay UE

[0071] The first relay UE may refer to a directly connected relay UE of the remote UE. In other words, the first relay UE may refer to a UE that establishes a direct connection or a PC5 connection with the remote UE.

[0072] In some embodiments, after receiving the request message sent by the remote UE, the first relay UE may continue to forward the request message to the second relay UE.

[0073] In some embodiments, the request message sent by the first relay UE may include an identifier of the remote UE and / or the first relay UE.

[0074] In some embodiments, the second relay UE may be a relay UE adjacent to the first relay UE in a multi-hop relay UE. That is, the multi-hop relay UE may forward the request message to the network device hop by hop. Furthermore, in some embodiments, during the forwarding of the request message, each relay UE may, based on the request message sent by the previous relay UE, further include the identifier of the relay UE in the request message.

[0075] In some embodiments, the second relay UE may be a relay UE in a multi-hop relay UE that is directly connected to the network device via an air interface. If the multi-hop relay UE also includes other relay UEs located between the first relay UE and the second relay UE, the first relay UE may transmit a request message to the second relay UE based on the end-to-end connection between the first relay UE and the second relay UE. Transmitting the request message based on the end-to-end connection can reduce the number of hops through which the request message is forwarded, facilitating rapid forwarding of the request message to the network device.

[0076] The multi-hop relay UE also includes a third relay UE directly connected to the network device (the third relay UE and the second relay UE may be the same relay UE or may not be the same relay UE). The third relay UE is a relay UE in the multi-hop relay UE that is directly connected to the network device via an air interface. The third relay UE can send the request message to the network device (e.g., via the air interface). For example, the third relay UE can send the request message to the network device via message 1 (msg1), message 3 (msg3), or RRC signaling (e.g., proprietary RRC signaling).

[0077] In some embodiments, after receiving the request message, the network device may send a first message to the third relay UE. Furthermore, in some embodiments, when sending the first message, the network device may further carry one or more of the following information: an identifier of the remote UE, an identifier of the first relay UE, and identifiers of relay UEs between the first relay UE and the third relay UE.

[0078] Furthermore, after the third relay UE receives the first message sent by the network device, the third relay UE may send the first message to the first relay UE. If there are other relay UEs between the third relay UE and the first relay UE, the third relay UE may forward the first message hop by hop, or send the first message through the end-to-end connection between the third relay UE and the first relay UE.

[0079] If the third relay UE forwards the first message hop by hop, it may carry one or more of the following information during the forwarding of the first message: the identifier of the remote UE, the identifier of the first relay UE, and the identifier of the relay UE between the first relay UE and the third relay UE.

[0080] A more specific example of Example 1.1 is provided below in conjunction with Figure 4. In the example below, the first relay UE mentioned above is relay UE 2, which is directly connected to the remote UE; the second relay UE and the third relay UE mentioned above are both relay UE 1, which is directly connected to the network device via an air interface.

[0081] Referring to Figure 4, in step S410, the remote UE sends a request message to relay UE 2. This request message is used to request a first system message and / or a first paging message. In some implementations, the request message may include one or more of the following information: the type of the first system message; the identifier of the UE to be paged by the first paging message; and the length of the paging cycle of the first paging message.

[0082] In step S420, relay UE 2 sends the request message to relay UE 1. Optionally, the request message may further include one or more of the following information: an identifier of the remote UE; and an identifier of relay UE 2.

[0083] If there are other relay UEs (not shown in the figure) between relay UE 2 and relay UE 1, relay UE 2 may select one of the following methods for processing:

[0084] Mode 1: The relay UE 2 sends the request message hop by hop, and the request message sent by the relay UE at each hop may further include the identifier of the relay UE at this hop.

[0085] Mode 2: Relay UE 2 sends the request message through the end-to-end connection between relay UE 1 (a relay directly connected to the network).

[0086] In step S430, relay UE 1 sends the request message to the network device. For example, relay UE 1 can send the request message to the network device via message 1, message 3, or dedicated RRC signaling.

[0087] In step S440, the network device sends a first system message and / or a first paging message to relay UE 1. Optionally, when sending the first system message and / or the first paging message, the network device may also carry one or more of the following information: an identifier of the remote UE; an identifier of relay UE 1; and an identifier of relay UE 2.

[0088] In step S450, relay UE 1 sends a first system message and / or a first paging message to relay UE 2. If there are other relay UEs between relay UE 2 and relay UE 1, relay UE 1 may choose one of the following methods to handle the situation:

[0089] Mode 1: Relay UE 1 sends a request message hop by hop, and the request message sent in each hop includes one or more of the following information: the identifier of the remote UE; the identifier of relay UE 1; and the identifier of relay UE 2;

[0090] Mode 2: Relay UE 1 sends the request message through the end-to-end connection between it and relay UE 2.

[0091] In step S460, relay UE 2 forwards the message to the remote UE.

[0092] Example 1.2: The first relay UE is a relay UE in a multi-hop relay UE that is connected to the network device via an air interface

[0093] In embodiment 1.2, the first relay UE may be a relay UE directly connected to the network device. The remote UE directly requests the first message from the relay UE directly connected to the network device, which can reduce the number of forwarding hops of the first message in the multi-hop relay UE, helping the remote UE to quickly obtain the first message.

[0094] In some embodiments, the request message may be transmitted based on an end-to-end connection between the remote UE and the first relay UE. Transmitting the request message based on the end-to-end connection can reduce the number of hops through which the request message is forwarded, thereby facilitating rapid forwarding of the request message to the network device.

[0095] In some embodiments, the first relay UE may send the request message to the network device (e.g., via an air interface). For example, the first relay UE may send the request message to the network device via message 1, message 3, or RRC signaling (e.g., proprietary RRC signaling).

[0096] In some embodiments, the network device may send a first message to the first relay UE.

[0097] Furthermore, after the first relay UE receives the first message sent by the network device, the first relay UE may send the first message to the remote UE. For example, the first relay UE may send the first message to the remote UE via an end-to-end connection between the first relay UE and the remote UE.

[0098] A more specific example of embodiment 1.2 is given below in conjunction with Figure 5. In the example below, the first relay UE mentioned above is relay UE 1, an end-to-end connection is established between the remote UE and relay UE 1, and relay UE 1 is directly connected to the network device via an air interface.

[0099] Referring to Figure 5, in step S510, the remote UE sends a request message to relay UE 1. This request message may be used to request a first system message and / or a first paging message. In some implementations, the request message may include one or more of the following information: the type of the first system message; the identifier of the UE to be paged by the first paging message; and the length of the paging cycle of the first paging message.

[0100] In step S520, relay UE 1 sends the request message to the network device. For example, relay UE 1 can send the request message to the network device via message 1, message 3, or dedicated RRC signaling.

[0101] In step S530 , the network device sends a first system message and / or a first paging message to the relay UE 1 .

[0102] In step S540, relay UE 1 sends a first system message and / or a first paging message to the remote UE through the end-to-end connection between relay UE 1 and the remote UE.

[0103] Example 2: Multipath relay scenario

[0104] In some embodiments, the first relay UE (or the connection or relay path where the first relay UE is located) can be determined based on first indication information sent by an upper layer of the access layer of the remote UE.

[0105] In some embodiments, the upper layer of the access layer may be, for example, a non-access stratum (NAS) layer, a V2X layer, a Prose layer, or an application layer.

[0106] In some embodiments, the first indication information may include indication information for a service. For example, the first indication information may include indication information for a service type.

[0107] As a possible implementation, the first indication information may indicate whether to transmit the request message based on the relay UE corresponding to the emergency service. For example, if the multiple relay UEs include relay UEs that support emergency services and relay UEs that support non-emergency services, and the first indication information indicates that the request message is transmitted based on the relay UE corresponding to the emergency service, the remote UE may select the relay UE that supports the emergency service from the multiple relay UEs as the first relay UE.

[0108] As another possible implementation, the first indication information may indicate a service priority (or a service priority corresponding to a relay UE). For example, relay 1 among multiple relay UEs corresponds to service 1, and relay 2 among multiple relay UEs corresponds to service 2. If the priority of service 1 is higher than the priority of service 2, relay 1 may be used as the first relay UE; if the priority of service 2 is higher than the priority of service 1, relay 2 may be used as the first relay UE.

[0109] In some embodiments, the first indication information may include indication information for the network slice. For example, the first indication information may include indication information for the network slice type.

[0110] As a possible implementation, the first indication information may indicate a network slice (or a network slice corresponding to a relay UE). For example, relay 1 among multiple relay UEs corresponds to network slice 1, and relay 2 among multiple relay UEs corresponds to network slice 2. If the first indication information indicates network slice 1, the remote UE may determine the first relay UE as relay 1; if the first indication information indicates network slice 2, the remote UE may determine the first relay UE as relay 2.

[0111] As another possible implementation, the first indication information may indicate the priority of the network slice (or the priority of the network slice corresponding to the relay UE). For example, relay 1 among multiple relay UEs corresponds to network slice 1, and relay 2 among multiple relay UEs corresponds to network slice 2. If the priority of network slice 1 is higher than the priority of network slice 2, relay 1 may be used as the first relay UE; if the priority of network slice 2 is higher than the priority of network slice 1, relay 2 may be used as the first relay UE.

[0112] In some embodiments, the first relay UE may be determined based on access stratum information of the remote UE. The access stratum information may be associated with one or more of the following information: link quality between the remote UE and multiple relay UEs; and link quality between multiple relay UEs and the network device.

[0113] For example, the access stratum information may indicate the link quality between the remote UE and multiple relay UEs. The remote UE may select a first relay UE from the multiple relay UEs based on the link quality between the remote UE and the multiple relay UEs. Exemplarily, the remote UE may select a relay UE with the best link quality with the remote UE as the first relay UE.

[0114] For another example, the access layer information may indicate the link quality between multiple relay UEs and the network device. The remote UE may select a first relay UE from the multiple relay UEs based on the link quality between the multiple relay UEs and the network device. Exemplarily, the remote UE may select the relay UE with the best link quality with the network device from the multiple relay UEs as the first relay UE.

[0115] For another example, the access stratum information may include access stratum configuration information. The access stratum configuration information may be a threshold value for the link quality between the remote UE and the relay UE. The remote UE may compare the link quality between the remote UE and multiple relay UEs with the threshold value to select a first relay UE.

[0116] For another example, the access layer information may include access layer configuration information. The access layer configuration information may be a threshold value for the link quality between the relay UE and the network device. The remote UE may compare the link qualities between multiple relay UEs and the network device with the threshold value to select a first relay UE.

[0117] In some embodiments, the first relay UE may be determined based on protocol predefined information. For example, the protocol predefined information may be used to instruct the relay UE to transmit a request message based on an emergency service. For another example, the protocol predefined information may be used to instruct the relay UE to transmit a request message based on a non-emergency service.

[0118] In some embodiments, the first relay UE can be determined based on the order in which multiple relay UEs are connected to the remote UE. For example, the remote UE can use the relay UE among the multiple relay UEs that first establishes a connection with the remote UE (such as a PC5 connection or a direct connection) as the first relay UE. For another example, the remote UE can use the relay UE among the multiple relay UEs that last establishes a connection with the remote UE (such as a PC5 connection or a direct connection) as the first relay UE.

[0119] In some implementations, the first relay UE may be determined based on a cell group associated with multiple relay UEs. For example, the remote UE may select a relay UE associated with a master cell group (MCG) as the first relay UE.

[0120] In some implementations, the first relay UE may be determined based on cells associated with multiple relay UEs. For example, the remote UE may use a relay UE associated with a primary cell (pcell) as the first relay UE.

[0121] In some embodiments, the first relay UE may be determined based on the implementation of the remote UE. That is, the remote UE may autonomously select the first relay UE from a plurality of relay UEs.

[0122] In some embodiments, if the first relay UE and the target relay UE (the target relay UE is the relay UE where the remote UE resides before sending the request message) are in different tracking areas (TAs), the remote UE may perform a mobility registration update before sending the request message to the first relay UE; in other words, the remote UE performs a registration update process.

[0123] In some embodiments, the first relay UE may send the request message to the network device (e.g., via an air interface). For example, the first relay UE may send the request message to the network device via message 1, message 3, or RRC signaling (e.g., proprietary RRC signaling).

[0124] In some embodiments, the network device may send the first message to the first relay UE. Further, in some embodiments, after the first relay UE receives the first message sent by the network device, the first relay UE may send the first message to the remote UE.

[0125] Figure 6 provides a more specific example of Embodiment 2. In the example of Figure 6 , a remote UE is connected to network device 1 via relay UE 1, and is connected to network device 2 via relay UE 2. Relay UE 1 is a relay UE supporting emergency services, and relay UE 2 is a relay UE supporting non-emergency services.

[0126] In step S610, the remote UE determines to send a request message to relay UE 1 based on first indication information sent by an upper layer of the access stratum (e.g., the NAS layer). If the first indication information indicates that the remote UE is requesting the first system message and / or the first paging message through a relay UE that supports emergency services, the process proceeds to step S620a. If the first indication information indicates that the remote UE is requesting the first system message and / or the first paging message through a relay UE that supports non-emergency services, the process proceeds to step S620b.

[0127] In step S620a, the remote UE sends a request message to the relay UE 1 (in this case, the relay UE 1 corresponds to the first relay UE mentioned above).

[0128] In step S630a, relay UE 1 sends the request message to network device 1. For example, relay UE 1 may send the request message to network device 1 via message 1, message 3, or dedicated RRC signaling.

[0129] In step S640a , the network device 1 sends a first system message and / or a first paging message to the relay UE 1 .

[0130] In step S650a, relay UE 1 sends a first system message and / or a first paging message to the remote UE.

[0131] In step S620b, the remote UE sends a request message to the relay UE 2 (in this case, the relay UE 2 corresponds to the first relay UE mentioned above).

[0132] In step S630b, relay UE 2 sends the request message to network device 2. For example, relay UE 1 may send the request message to network device 2 via message 1, message 3, or dedicated RRC signaling.

[0133] In step S640a , the network device 2 sends a first system message and / or a first paging message to the relay UE 2 .

[0134] In step S650a, relay UE 2 sends a first system message and / or a first paging message to the remote UE.

[0135] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 6 . The device embodiment of the present application is described in detail below in conjunction with Figures 7 to 10 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0136] FIG7 is a diagram illustrating an exemplary structure of a UE according to one embodiment of the present application. The UE 700 shown in FIG7 may be the remote UE mentioned above. The UE 700 may include a communication module 710. The communication module 710 may be configured to send a request message to a first relay UE, wherein the request message is configured to request a first message sent by a network device to the first relay UE.

[0137] In some embodiments, there is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

[0138] In some embodiments, the first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

[0139] In some embodiments, the first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

[0140] In some embodiments, the request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

[0141] In some embodiments, the remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

[0142] In some embodiments, the first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; access layer information of the remote UE; protocol predefined information; the order in which the multiple relay UEs are connected to the remote UE; cell groups or cells associated with multiple relay UEs; and the implementation of the remote UE.

[0143] In some embodiments, the first indication information includes indication information for the service and / or indication information for the network slice.

[0144] In some embodiments, the first indication information is used to indicate one or more of the following information: whether the request message is transmitted based on the relay UE corresponding to the emergency service; the service priority corresponding to the relay UE; the type of network slice corresponding to the relay UE; and the priority of the network slice corresponding to the relay UE.

[0145] In some embodiments, the access layer information is used to indicate one or more of the following: link quality between the remote UE and the multiple relay UEs; and link quality between the multiple relay UEs and network devices.

[0146] In some embodiments, the protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

[0147] In some embodiments, if the first relay UE and the target relay UE are in different tracking areas, before the remote UE sends a request message to the first relay UE, the remote UE also includes: an update module for performing mobility registration update; wherein the target relay UE is the relay UE where the remote UE resides before sending the request message.

[0148] In some embodiments, the first message includes one or more of: a first system message; and a first paging message.

[0149] In some embodiments, the first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

[0150] In some embodiments, the first message includes the first paging message, the request message includes third indication information, and the third indication information is used to indicate one or more of the following: an identifier of the UE associated with the first paging message; and the length of the paging cycle of the first paging message.

[0151] In some embodiments, the communication module 710 is further configured to receive the first message sent by the first relay UE.

[0152] FIG8 is a diagram illustrating an exemplary structure of a UE according to another embodiment of the present application. UE 800 shown in FIG8 may be the first relay UE mentioned above. UE 800 may include a communication module 810. Communication module 810 may be configured to receive a request message sent by a remote UE, the request message being used to request a first message sent by a network device to the first relay UE.

[0153] In some embodiments, there is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

[0154] In some embodiments, the first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

[0155] In some embodiments, the communication module is further configured to send the request message to the second relay UE.

[0156] In some embodiments, the request message sent by the first relay UE includes an identifier of the remote UE and / or the first relay UE.

[0157] In some embodiments, the second relay UE is a relay UE adjacent to the first relay UE among the multi-hop relay UEs.

[0158] In some embodiments, the second relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

[0159] In some embodiments, the multi-hop relay UE includes a relay UE located between the first relay UE and the second relay UE, and the first relay UE transmits the request message to the second relay UE based on an end-to-end connection between the first relay UE and the second relay UE.

[0160] In some embodiments, the first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

[0161] In some embodiments, the request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

[0162] In some embodiments, the remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

[0163] In some embodiments, the first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; access layer information of the remote UE; protocol predefined information; the order in which the multiple relay UEs are connected to the remote UE; cell groups or cells associated with multiple relay UEs; and the implementation of the remote UE.

[0164] In some embodiments, the first indication information includes indication information for the service and / or indication information for the network slice.

[0165] In some embodiments, the first indication information is used to indicate one or more of the following information: whether the request message is transmitted based on the relay UE corresponding to the emergency service; the service priority corresponding to the relay UE; the type of network slice corresponding to the relay UE; and the priority of the network slice corresponding to the relay UE.

[0166] In some embodiments, the access layer information is used to indicate one or more of the following: link quality between the remote UE and the multiple relay UEs; and link quality between the multiple relay UEs and network devices.

[0167] In some embodiments, the protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

[0168] In some embodiments, the first message includes one or more of: a first system message; and a first paging message.

[0169] In some embodiments, the first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

[0170] In some embodiments, the first message includes the first paging message, the request message includes third indication information, and the third indication information is used to indicate one or more of the following: an identifier of the UE associated with the first paging message; and the length of the paging cycle of the first paging message.

[0171] In some embodiments, the communication module is further configured to send the first message to the remote UE.

[0172] FIG9 is a diagram illustrating an exemplary structure of a network device according to an embodiment of the present application. The network device 900 shown in FIG9 may include a communication module 910. The communication module 910 may be configured to receive, via one or more relay UEs, a request message sent by a remote UE, the request message being configured to request a first relay UE among the one or more relay UEs to transmit a first message from the network device.

[0173] In some embodiments, there is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

[0174] In some embodiments, the first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

[0175] In some embodiments, the first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

[0176] In some embodiments, the request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

[0177] In some embodiments, the request message received by the network device further includes identifiers of the one or more relay UEs and the remote UE.

[0178] In some embodiments, the remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

[0179] In some embodiments, the first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; access layer information of the remote UE; protocol predefined information; the order in which the multiple relay UEs are connected to the remote UE; cell groups or cells associated with multiple relay UEs; and the implementation of the remote UE.

[0180] In some embodiments, the first indication information includes indication information for the service and / or indication information for the network slice.

[0181] In some embodiments, the first indication information is used to indicate one or more of the following information: whether the request message is transmitted based on the relay UE corresponding to the emergency service; the service priority corresponding to the relay UE; the type of network slice corresponding to the relay UE; and the priority of the network slice corresponding to the relay UE.

[0182] In some embodiments, the access layer information is used to indicate one or more of the following: link quality between the remote UE and the multiple relay UEs; and link quality between the multiple relay UEs and network devices.

[0183] In some embodiments, the protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

[0184] In some embodiments, the first message includes one or more of: a first system message; and a first paging message.

[0185] In some embodiments, the first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

[0186] In some embodiments, the first message includes the first paging message, the request message includes third indication information, and the third indication information is used to indicate one or more of the following: an identifier of the UE associated with the first paging message; and the length of the paging cycle of the first paging message.

[0187] In some embodiments, the communication module is further configured to send the first message to the remote UE via the one or more relay UEs, and the first message includes identifiers of the one or more relay UEs.

[0188] Figure 10 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 10 indicate that the unit or module is optional. The device 1000 may be used to implement the method described in the above method embodiment. The device 1000 may be a chip, a UE, or a network device.

[0189] The device 1000 may include one or more processors 1010. The processor 1010 may support the device 1000 to implement the method described in the method embodiment above. The processor 1010 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0190] The apparatus 1000 may further include one or more memories 1020. The memories 1020 store programs that can be executed by the processor 1010, causing the processor 1010 to perform the methods described in the above method embodiments. The memories 1020 may be independent of the processor 1010 or integrated into the processor 1010.

[0191] The apparatus 1000 may further include a transceiver 1030. The processor 1010 may communicate with other devices or chips via the transceiver 1030. For example, the processor 1010 may transmit and receive data with other devices or chips via the transceiver 1030.

[0192] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a UE or network device provided in the present application, and the program enables a computer to execute the method performed by the UE or network device in each embodiment of the present application.

[0193] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the UE or network device provided in the embodiments of the present application, and the program causes a computer to execute the method performed by the UE or network device in each embodiment of the present application.

[0194] The embodiments of the present application also provide a computer program. The computer program can be applied to the UE or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the methods performed by the UE or network device in various embodiments of the present application.

[0195] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0196] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0197] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0198] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0199] In the embodiments of the present application, "pre-defined" or "pre-configured" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a UE and a network device). The present application does not limit the specific implementation method. For example, pre-defined may refer to a definition in a protocol.

[0200] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0201] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0202] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0203] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0205] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0206] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using 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 process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0207] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: The remote user equipment UE sends a request message to the first relay UE, where the request message is used to request the first relay UE to send a first message from a network device.

2. The method according to claim 1, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

3. The method according to claim 2, characterized in that The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

4. The method according to claim 2, characterized in that: The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

5. The method according to claim 4, characterized in that The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

6. The method according to claim 1, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

7. The method according to claim 6, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

8. The method according to claim 7, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

9. The method according to claim 8, characterized in that The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

10. The method according to any one of claims 7 to 9, characterized in that: The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

11. The method according to any one of claims 7 to 10, characterized in that: The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

12. The method according to any one of claims 7 to 11, characterized in that: If the first relay UE and the target relay UE are in different tracking areas, before the remote UE sends a request message to the first relay UE, the method further includes: The remote UE performs mobility registration update; The target relay UE is the relay UE where the remote UE resides before sending the request message.

13. The method according to any one of claims 1 to 12, characterized in that The first message includes one or more of the following: A first system message; and First paging message.

14. The method according to claim 13, characterized in that The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

15. The method according to claim 13 or 14, characterized in that The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

16. The method according to any one of claims 1 to 15, characterized in that The method further comprises: The remote UE receives the first message sent by the first relay UE.

17. A wireless communication method, characterized in that: include: The first relay user equipment UE receives a request message sent by a remote UE, where the request message is used to request the first relay UE to send a first message from a network device.

18. The method according to claim 17, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

19. The method according to claim 18, characterized in that The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

20. The method according to claim 19, characterized in that The method further comprises: The first relay UE sends the request message to the second relay UE.

21. The method according to claim 20, characterized in that The request message sent by the first relay UE includes an identifier of the remote UE and / or the first relay UE.

22. The method according to claim 20 or 21, characterized in that The second relay UE is a relay UE adjacent to the first relay UE among the multi-hop relay UEs.

23. The method according to claim 20 or 21, characterized in that The second relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

24. The method according to claim 23, characterized in that The multi-hop relay UE includes a relay UE located between the first relay UE and the second relay UE, and the first relay UE transmits the request message to the second relay UE based on an end-to-end connection between the first relay UE and the second relay UE.

25. The method according to claim 18, characterized in that The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

26. The method according to claim 25, characterized in that The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

27. The method according to claim 17, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

28. The method according to claim 27, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

29. The method according to claim 28, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

30. The method according to claim 29, characterized in that The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

31. The method according to any one of claims 28 to 30, characterized in that The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

32. The method according to any one of claims 28 to 31, characterized in that The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

33. The method according to any one of claims 17 to 32, characterized in that The first message includes one or more of the following: A first system message; and First paging message.

34. The method according to claim 33, characterized in that The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

35. The method according to claim 33 or 34, characterized in that The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

36. The method according to any one of claims 17 to 35, characterized in that The method further comprises: The first relay UE sends the first message to the remote UE.

37. A method of wireless communication, characterized in that: include: The network device receives a request message sent by a remote UE through one or more relay user equipments UE, where the request message is used to request a first relay UE among the one or more relay UEs to send a first message sent by the network device.

38. The method according to claim 37, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

39. The method according to claim 38, characterized in that The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

40. The method according to claim 38, characterized in that The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

41. The method according to claim 40, characterized in that The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

42. The method according to any one of claims 38 to 40, characterized in that The request message received by the network device also includes identifiers of the one or more relay UEs and the remote UE.

43. The method according to claim 37, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

44. The method according to claim 43, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

45. The method according to claim 44, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

46. ​​The method according to claim 45, characterized in that The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

47. The method according to any one of claims 44 to 46, characterized in that The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

48. The method according to any one of claims 44 to 47, characterized in that The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

49. The method according to any one of claims 37-48, characterized in that The first message includes one or more of the following: A first system message; and First paging message.

50. The method according to claim 49, characterized in that The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

51. The method according to claim 49 or 50, characterized in that The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

52. The method according to any one of claims 37 to 51, characterized in that The method further comprises: The network device sends the first message to the remote UE through the one or more relay UEs, and the first message includes identifiers of the one or more relay UEs.

53. A user equipment UE, characterized in that: The UE is a remote UE, and the remote UE includes: The communication module is used to send a request message to the first relay UE, where the request message is used to request the first relay UE to send a first message from a network device.

54. The UE according to claim 53, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

55. The UE according to claim 54, characterized in that The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

56. The UE according to claim 54, characterized in that The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

57. The UE according to claim 56, characterized in that The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

58. The UE according to claim 53, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

59. The UE according to claim 58, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

60. The UE according to claim 59, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

61. The UE according to claim 60, characterized in that The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

62. The UE according to any one of claims 59 to 61, characterized in that: The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

63. The UE according to any one of claims 59 to 62, characterized in that: The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

64. The UE according to any one of claims 59 to 63, characterized in that: If the first relay UE and the target relay UE are in different tracking areas, before the remote UE sends a request message to the first relay UE, the remote UE further includes: An update module, used for performing mobility registration update; The target relay UE is the relay UE where the remote UE resides before sending the request message.

65. The UE according to any one of claims 53 to 64, characterized in that: The first message includes one or more of the following: A first system message; and First paging message.

66. The UE according to claim 65, characterized in that The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

67. The UE according to claim 65 or 66, characterized in that The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

68. The UE according to any one of claims 53 to 67, characterized in that: The communication module is also used to receive the first message sent by the first relay UE.

69. A user equipment UE, characterized in that: The UE is a first relay UE, and the first relay UE includes: The communication module is used to receive a request message sent by a remote UE, where the request message is used to request the first relay UE to send a first message from a network device.

70. The UE according to claim 69, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

71. The UE according to claim 70, characterized in that The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

72. The UE according to claim 71, characterized in that The communication module is further configured to send the request message to the second relay UE.

73. The UE according to claim 72, characterized in that The request message sent by the first relay UE includes an identifier of the remote UE and / or the first relay UE.

74. The UE according to claim 72 or 73, characterized in that The second relay UE is a relay UE adjacent to the first relay UE among the multi-hop relay UEs.

75. The UE according to claim 72 or 73, characterized in that The second relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

76. The UE according to claim 75, characterized in that The multi-hop relay UE includes a relay UE located between the first relay UE and the second relay UE, and the first relay UE transmits the request message to the second relay UE based on an end-to-end connection between the first relay UE and the second relay UE.

77. The UE according to claim 70, characterized in that The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

78. The UE according to claim 77, characterized in that The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

79. The UE according to claim 69, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

80. The UE according to claim 79, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

81. The UE according to claim 80, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

82. The UE according to claim 81, characterized in that The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

83. The UE according to any one of claims 80 to 82, characterized in that: The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

84. The UE according to any one of claims 80 to 83, characterized in that The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

85. The UE according to any one of claims 69 to 84, characterized in that: The first message includes one or more of the following: A first system message; and First paging message.

86. The UE according to claim 85, characterized in that The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

87. The UE according to claim 85 or 86, characterized in that The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

88. The UE according to any one of claims 69 to 87, characterized in that: The communication module is also used to send the first message to the remote UE.

89. A network device, characterized in that: include: The communication module is used to receive a request message sent by a remote UE through one or more relay UEs, where the request message is used to request a first message sent by the network device to a first relay UE among the one or more relay UEs.

90. The network device according to claim 89, characterized in that There is a multi-hop relay UE between the remote UE and the network device, and the first relay UE is one of the multi-hop relay UEs.

91. The network device according to claim 90, characterized in that: The first relay UE is a relay UE adjacent to the remote UE among the multi-hop relay UEs.

92. The network device according to claim 90, characterized in that: The first relay UE is a relay UE among the multi-hop relay UEs that is connected to the network device via an air interface.

93. The network device according to claim 92, characterized in that: The request message is transmitted based on an end-to-end connection between the remote UE and the first relay UE.

94. The network device according to any one of claims 90-92, characterized in that: The request message received by the network device also includes identifiers of the one or more relay UEs and the remote UE.

95. The network device according to claim 89, characterized in that The remote UE establishes multiple connections with the network device through multiple relay UEs, and the first relay UE is one of the multiple relay UEs.

96. The network device according to claim 95, characterized in that The first relay UE is determined based on one of the following: first indication information sent by an upper layer of the access layer of the remote UE; Access layer information of the remote UE; Protocol predefined information; The order in which the multiple relay UEs are connected to the remote UE; The cell groups or cells associated with the multiple relay UEs; and Implementation of the remote UE.

97. The network device according to claim 96, characterized in that The first indication information includes indication information for the service and / or indication information for the network slice.

98. The network device according to claim 97, characterized in that: The first indication information is used to indicate one or more of the following information: Whether to transmit the request message based on the relay UE corresponding to the emergency service; Service priority corresponding to the relay UE; The type of network slice corresponding to the relay UE; as well as The priority of the network slice corresponding to the relay UE.

99. The network device according to any one of claims 96-98, characterized in that: The access layer information is used to indicate one or more of the following: Link quality between the remote UE and the plurality of relay UEs; and The link qualities between the multiple relay UEs and the network device.

100. The network device according to any one of claims 96-99, characterized in that: The protocol predefined information is used to instruct the relay UE corresponding to the emergency service to transmit the request message.

101. The network device according to any one of claims 89-100, characterized in that: The first message includes one or more of the following: A first system message; and First paging message.

102. The network device according to claim 101, characterized in that: The first message includes the first system message, the request message includes second indication information, and the second indication information is used to indicate a type of the system message.

103. The network device according to claim 101 or 102, characterized in that: The first message includes the first paging message, and the request message includes third indication information, where the third indication information is used to indicate one or more of the following: an identifier of a UE associated with the first paging message; and The length of the paging cycle of the first paging message.

104. The network device according to any one of claims 89-103, characterized in that: The communication module is further configured to send the first message to the remote UE via the one or more relay UEs, and the first message includes identifiers of the one or more relay UEs.

105. A user equipment UE, characterized in that: It includes a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send a signal so that the UE executes the method as described in any one of claims 1-16 or 17-36.

106. A network device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the network device executes the method as described in any one of claims 37-52.

107. A device, characterized in that: It comprises a processor, which is used to call a program from a memory so that the device executes the method as described in any one of claims 1-16, 17-36 or 37-52.

108. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory so that a device equipped with the chip executes a method as described in any one of claims 1-16, 17-36 or 37-52.

109. A computer-readable storage medium, characterized in that: A program is stored thereon, the program causing the computer to execute the method as described in any one of claims 1-16, 17-36 or 37-52.

110. A computer program product, characterized in that Comprising a program, the program causing a computer to execute the method as described in any one of claims 1-16, 17-36 or 37-52.

111. A computer program, characterized in that The computer program causes a computer to execute the method of any one of claims 1-16, 17-36 or 37-52.

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