EP-4742760-A1 - METHOD FOR PERFORMING RELAY COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM, AND DEVICE THEREFOR

EP4742760A1EP 4742760 A1EP4742760 A1EP 4742760A1EP-4742760-A1

Abstract

A method by which a relay terminal forwards a discovery message in a wireless communication system, and a device therefor, according to various embodiments, are disclosed. Disclosed are the method and the device therefor, the method comprising the steps of: receiving a first discovery message for a multi-hop relay; and determining whether the first discovery message is forwarded on the basis of a first time stamp and a time budget included in the first message.

Inventors

BACK, SEOYOUNG
LEE, SEUNGMIN
PARK, GIWON

Assignees

LG Electronics Inc.

Dates

Publication Date: 20260513
Application Date: 20240701

Claims (15)

A method for forwarding a discovery message by a relay user equipment (UE) in a wireless communication system, the method comprising: receiving a first discovery message for multi-hop relay; and determining whether to forward the first discovery message, based on a first time stamp and a time budget included in the first message.
The method of claim 1, wherein based on a remaining time budget, which is the time budget minus a difference value between the first time stamp and a second time stamp, being greater than a specific threshold, the relay UE forwards the first discovery message.
The method of claim 1, wherein based on a remaining time budget, which is the time budget minus a difference value between the first time stamp and a second time stamp, being equal to or less than a specific threshold, the relay UE does not forward the first discovery message.
The method of claim 1, wherein an initial value of the time budget is determined based on quality of service (QoS) related to a message to be transmitted between a first device and a second device connected through the multi-hop relay.
The method of claim 2, wherein the relay UE forwards the first discovery message after replacing the first time stamp with the second time stamp and the time budget with the remaining time budget.
The method of claim 2, wherein the first discovery message further includes a first sequence number.
The method of claim 6, further comprising receiving a second discovery message including a second sequence number after forwarding the first discovery message, wherein based on a source device and a target device being the same between the first discovery message and the second discovery message, and the second sequence number being identical to the first sequence number, the second discovery message is not forwarded.
The method of claim 2, wherein the first discovery message further includes information about a first hop count.
The method of claim 8, further comprising receiving a second discovery message including a second hop count after forwarding the first discovery message, wherein based on a source device and a target device being the same between the first discovery message and the second discovery message, and the second hop count being greater than the first hop count, the second discovery message is not forwarded.
The method of claim 1, wherein the multi-hop relay is user equipment to network (U2N) relay for transmitting and receiving data between a remote UE and a network.
A computer-readable recording medium having recorded thereon a program for performing the method of claim 1.
A relay user equipment (UE) for forwarding a discovery message in a wireless communication system, the relay UE comprising: a radio frequency (RF) transceiver; and a processor connected to the RF transceiver, wherein the processor controls the RF transceiver to receive a first discovery message for multi-hop relay, and determines whether to forward the first discovery message, based on a first time stamp and a time budget included in the first message.
A processing device for controlling a relay user equipment (UE) that forwards a discovery message in a wireless communication system, the processing device comprising: at least one processor; and at least one memory connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the relay UE to: receive a first discovery message for multi-hop relay; and determine whether to forward the first discovery message, based on a first time stamp and a time budget included in the first message.
A method for transmitting a discovery message by a first device in a wireless communication system, the method comprising: transmitting a discovery message for connection to a second device through multi-hop relay; and receiving a response message for the discovery message, wherein the discovery message includes a first time stamp and a time budget, and a value of the time budget is determined based on quality of service (QoS) related to a message to be transmitted to the second device through the multi-hop relay.
A first device for transmitting a discovery message in a wireless communication system, the first device comprising: a radio frequency (RF) transceiver; and a processor connected to the RF transceiver, wherein the processor controls the RF transceiver to transmit a discovery message for connection to a second device through multi-hop relay, and receive a response message for the discovery message, and wherein the discovery message includes a first time stamp and a first time budget, and a value of the first time budget is determined based on quality of service (QoS) related to a message to be transmitted to the second device through the multi-hop relay.

Description

TECHNICAL FIELD The present disclosure relates to a method and apparatus for forwarding a discovery message for multi-hop display by a relay user equipment (UE) in a wireless communication system. BACKGROUND Wireless communication systems have been widely deployed to provide various types of communication services such as voice or data. In general, a wireless communication system is a multiple access system that supports communication of multiple users by sharing available system resources (a bandwidth, transmission power, etc.). Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, and a multi carrier frequency division multiple access (MC-FDMA) system. A sidelink (SL) refers to a communication method in which a direct link is established between user equipment (UE), and voice or data is directly exchanged between terminals without going through a base station (BS). SL is being considered as one way to solve the burden of the base station due to the rapidly increasing data traffic. V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and infrastructure-built objects through wired/wireless communication. V2X may be divided into four types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication may be provided through a PC5 interface and/or a Uu interface. As more and more communication devices require larger communication capacities in transmitting and receiving signals, there is a need for mobile broadband communication improved from the legacy radio access technology. Accordingly, communication systems considering services/UEs sensitive to reliability and latency are under discussion. A next-generation radio access technology in consideration of enhanced mobile broadband communication, massive Machine Type Communication (MTC), and Ultra-Reliable and Low Latency Communication (URLLC) may be referred to as new radio access technology (RAT) or new radio (NR). Even in NR, vehicle-to-everything (V2X) communication may be supported. FIG. 1 is a diagram comparing RAT-based V2X communication before NR with NR-based V2X communication. Regarding V2X communication, in RAT prior to NR, a scheme for providing a safety service based on V2X messages such as a basic safety message (BSM), a cooperative awareness message (CAM), and a decentralized environmental notification message (DENM) was mainly discussed. The V2X message may include location information, dynamic information, and attribute information. For example, the UE may transmit a periodic message type CAM and/or an event triggered message type DENM to another UE. For example, the CAM may include dynamic state information about a vehicle such as direction and speed, vehicle static data such as dimensions, and basic vehicle information such as external lighting conditions and route details. For example, a UE may broadcast the CAM, and the CAM latency may be less than 100 ms. For example, when an unexpected situation such as a breakdown of the vehicle or an accident occurs, the UE may generate a DENM and transmit the same to another UE. For example, all vehicles within the transmission coverage of the UE may receive the CAM and/or DENM. In this case, the DENM may have a higher priority than the CAM. Regarding V2X communication, various V2X scenarios have been subsequently introduced in NR. For example, the various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, and remote driving. For example, based on vehicle platooning, vehicles may dynamically form a group and move together. For example, to perform platoon operations based on vehicle platooning, vehicles belonging to the group may receive periodic data from a leading vehicle. For example, the vehicles belonging to the group may reduce or increase the distance between the vehicles based on the periodic data. For example, based on advanced driving, a vehicle may be semi-automated or fully automated. For example, each vehicle may adjust trajectories or maneuvers based on data acquired from local sensors of nearby vehicles and/or nearby logical entities. Also, for example, each vehicle may share driving intention with nearby vehicles. For example, on the basis of extended sensors, raw data or processed data acquired through local sensors, or live video data may be exchanged between a vehicle, a logical entity, UEs of pedestrians and/or a V2X application server. Thus, for example, the vehicle may recognize an environment that is improved over an environment that may be detected using its own sensor. For example, for a person who cannot drive or a remote vehicle locat