US-12627956-B2 - Method for terminal to transmit first signal and device for same in wireless communication system

Abstract

Disclosed are a method for a first vehicle to everything (V2X) terminal to transmit a first signal and a device for same in a wireless communication system according to various embodiments. The method comprises the steps of: receiving second signals from neighboring devices; and transmitting the first signal on the basis of the second signals, wherein the second signals are sound signals generated from the neighboring devices, and the first V2X terminal calculates a danger level on the basis of signal characteristics of the sound signals and determines the transmission interval of the first signal on the basis of the danger level.

Inventors

• Jaeho Hwang
• Hakseong Kim
• Hanbyul Seo

Assignees

• LG ELECTRONICS INC.

Dates

Publication Date

20260512

Application Date

20220114

Priority Date

20210114

Claims (13)

1. 1 . A method of a first user equipment (UE) comprising: collecting acoustic signals generated by neighboring devices using an acoustic sensor; determining a transmission period of a first radio signal based on a risk level determined by an intensity of the acoustic signals; and transmitting a first radio signal including status information of the first UE based on the transmission period of the first radio signal.
2. 2 . The method of claim 1 , wherein the intensity of the acoustic signals is calculated based on second acoustic signals extracted from the acoustic signals within at least one predetermined frequency bandwidth, wherein the first UE calculates a number of first acoustic signals determined to be blue-shifted among the acoustic signals based on the Doppler effect, and wherein the transmission period of the first radio signal is determined based on the number of the first acoustic signals and the risk level.
3. 3 . The method of claim 1 , wherein the transmission period is determined based on at least one transmission period configured for a first transmission mode related to the risk level among a plurality of transmission modes having different transmission and reception periods, and wherein a message type of the first radio signal is determined based on a message type configured for the first transmission mode related to the risk level among the plurality of transmission modes.
4. 4 . The method of claim 3 , wherein an application sleep timing, a display brightness level, a location measurement scheme, and a black box operation mode of the first UE are determined based on the first transmission mode.
5. 5 . The method of claim 3 , wherein the first UE is further configured to: measure a Doppler frequency shift for each of the acoustic signals; and calculate an approach level based on the measured Doppler frequency shift, and wherein based on that the approach level is more than or equal to a first predetermined threshold, the first transmission mode is switched to a second transmission mode having a shorter transmission period.
6. 6 . The method of claim 5 , wherein the second transmission mode is a transmission mode having a shortest transmission and reception period among the plurality of transmission modes.
7. 7 . The method of claim 5 , wherein detection of an acoustic signal having a positive Doppler frequency shift related to a blue shift increases the approach level compared to detection of an acoustic signal having a negative Doppler frequency shift related to a red shift.
8. 8 . The method of claim 3 , wherein the first UE is further configured to: predict an acoustic signal direction of each of the acoustic signals based on a difference between arrival times at which each acoustic signal arrives at two or more acoustic signal receivers spaced apart at a predetermined distance; and calculate an emergency level based on the acoustic signal direction, and wherein based on that the emergency level is more than or equal to a second predetermined threshold, the first transmission mode is switched to a second transmission mode having a shorter transmission period.
9. 9 . The method of claim 8 , wherein the second transmission mode is a transmission mode having a shortest transmission and reception period among the plurality of transmission modes.
10. 10 . The method of claim 8 , wherein the first UE is configured to predict directions of the acoustic signals among a first direction, a second direction, and a third direction, and wherein detection of an acoustic signal predicted to be in the first direction corresponding to a traveling direction of the first UE increases the emergency level compared to detection of an acoustic signal predicted to be in the second or third direction.
11. 11 . The method of claim 10 , wherein the first UE is configured to aggregate an excess intensity for each direction, where the excess intensity is an extent to which a peak value of a intensity of each of the acoustic signals exceeds a predetermined threshold, and wherein the emergency level is calculated by adding a product of excess intensities aggregated for the second direction and excess intensities aggregated for the third direction to excess intensities aggregated for the first direction.
12. 12 . A method of a second user equipment (UE) comprising: receiving a first radio signal including status information of a first UE from the first UE; and obtaining a risk level for the first UE based on the status information, wherein the second UE is configured to determine a reception period of the first radio signal based on the risk level, and wherein the risk level is determined based on an intensity of acoustic signals collected by the first UE.
13. 13 . A first user equipment (UE) comprising: a radio frequency (RF) transceiver; an acoustic sensor; and a processor connected to the RF transceiver and the acoustic sensor, wherein the processor is configured to: control the acoustic sensor to collect acoustic signals generated by neighboring devices; determine a transmission period of a first radio signal based on a risk level determined by an intensity of the acoustic signals; and control the RF transceiver to transmit the first radio signal including status information of the first UE based on the transmission period of the first radio signal.

Description

This application is a continuation application of International Application No. PCT/KR2022/000755, filed on Jan. 14, 2022, which claims the benefit of Korean Patent Application No. 10-2021-0005398 filed on Jan. 14, 2021, the contents of which are all hereby incorporated by reference herein in their entirety. TECHNICAL FIELD The present disclosure relates to a method of transmitting a first signal by a vehicle-to-everything (V2X) user equipment (UE) in a wireless communication system and 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