EP-4742707-A1 - METHOD AND APPARATUS FOR TRANSMITTING MESSAGE BY TERMINAL IN WIRELESS COMMUNICATION SYSTEM

Abstract

Disclosed are a method and an apparatus for transmitting a message by a first terminal in a wireless communication system according to various embodiments. Disclosed are a method and an apparatus therefor, the method comprising the steps of: periodically transmitting a first message including first mobility information to a second terminal via a first link for direct device-to-device communication; and periodically transmitting a second message including second mobility information to the second terminal via a second link for communication with a network.

Inventors

• HWANG, JAEHO
• SEO, HANBYUL

Assignees

• LG Electronics Inc.

Dates

Publication Date

20260513

Application Date

20240702

Claims (15)

1. A method of transmitting a message by a first User Equipment (UE) in a wireless communication system, the method comprising: periodically transmitting a first message comprising first mobility information to a second UE through a first link for direct communication between UEs; and periodically transmitting a second message comprising second mobility information to the second UE through a second link for communication with a network, wherein the second message is generated and transmitted after an offset time from a transmission time of the first message, and wherein a transmission period of the second message is changed based on a channel quality of the first link.
2. The method of claim 1, wherein the transmission period of the second message is decreased based on the channel quality of the first link being less than a first threshold quality.
3. The method of claim 1, wherein the transmission period of the second message is decreased based on an increase in a transmission period of the first message due to the channel quality of the first link.
4. The method of claim 1, wherein the first UE changes the transmission period of the second message in further consideration of at least one of mobility change and risk detection.
5. The method of claim 1, wherein, based on a transmission period of the first message being identical to the transmission period of the second message, the offset time is set to a value obtained by dividing the transmission period of the second message by two.
6. The method of claim 1, wherein the offset time is determined based on a difference between reception delay of the first message and reception delay of the second message and based on the transmission period of the second message.
7. The method of claim 1, wherein the channel quality of the first link is a Channel Busy Ratio (CBR).
8. The method of claim 1, wherein the first link is a link based on a PC5 interface, and wherein the second link is a link based on a Uu interface.
9. A computer-readable recording medium having recorded thereon a program for executing the method of claim 1.
10. A first User Equipment (UE) configured to transmit a message in a wireless communication system, the first UE comprising: a Radio Frequency (RF) transceiver; and a processor connected to the RF transceiver, wherein the processor is configured to control the RF transceiver to: periodically transmit a first message comprising first mobility information to a second UE through a first link for direct communication between UEs; and periodically receive a second message comprising second mobility information to the second UE through a second link for communication with a network, wherein the second message is generated and transmitted after an offset time from a transmission time of the first message, and wherein a transmission period of the second message is changed based on a channel quality of the first link.
11. A processing device configured to control a first User Equipment (UE) transmitting a 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 configured to store instructions that, based on execution by the at least one processor, cause the first UE to: periodically transmit a first message comprising first mobility information to a second UE through a first link for direct communication between UEs; and periodically receive a second message comprising second mobility information to the second UE through a second link for communication with a network, wherein the second message is generated and transmitted after an offset time from a transmission time of the first message, and wherein a transmission period of the second message is changed based on a channel quality of the first link.
12. A method of receiving a message by a second User Equipment (UE) in a wireless communication system, the method comprising: periodically receiving a first message comprising first mobility information from a first UE through a first link for direct communication between UEs; and periodically receiving a second message comprising second mobility information from the first UE through a second link for communication with a network, wherein the second message is a message generated after an offset time from a reception time of the first message, and wherein a reception period of the second message is changed based on a channel quality of the first link.
13. A computer-readable recording medium having recorded thereon a program for executing the method of claim 12.
14. A second User Equipment (UE) configured to receive a message in a wireless communication system, the second UE comprising: a Radio Frequency (RF) transceiver; and a processor connected to the RF transceiver, wherein the processor is configured to control the RF transceiver to: periodically receive a first message comprising first mobility information from a first UE through a first link for direct communication between UEs; and periodically receive a second message comprising second mobility information from the first UE through a second link for communication with a network, wherein the second message is a message generated after an offset time from a reception time of the first message, and wherein a reception period of the second message is changed based on a channel quality of the first link.
15. A processing device configured to control a second User Equipment (UE) receiving a 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 configured to store instructions that, based on execution by the at least one processor, cause the second UE to: periodically receive a first message comprising first mobility information from a first UE through a first link for direct communication between UEs; and periodically receive a second message comprising second mobility information from the first UE through a second link for communication with a network, wherein the second message is a message generated after an offset time from a reception time of the first message, and wherein a reception period of the second message is changed based on a channel quality of the first link.

Description

TECHNICAL FIELD The present disclosure relates to a method for a User Equipment (UE) to transmit a Vehicle-to-Everything (V2X) message and a Vehicle-to-Network (V2N) message in a wireless communication system, and an apparatus therefor. 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 wh