Method by which VRU transmits safety message in wireless communication system supporting sidelink, and apparatus therefor
Disclosed are a method by which a VRU transmits a safety message in a wireless communication system, and an apparatus therefor, the method comprising the steps of: transmitting state information to a base station on the basis of mobility information; receiving reconfiguration information about transmission parameters from the base station; and transmitting a safety message on the basis of the reconfiguration information, wherein the state information is included in a UEAssistanceInformation message and transmitted if a collision risk is predicted according to peripheral information and the mobility information, and the safety message is transmitted on the basis of transmission power and a transmission period that are changed according to the reconfiguration information.
1 . A method for transmitting a safety message by a vulnerable road user (VRU) device in a wireless communication system supporting sidelink, the method comprising:
transmitting state information to a device based on mobility information;
receiving reconfiguration information about transmission parameters from the device; and
transmitting a safety message based on the reconfiguration information, wherein the state information is included and transmitted in a UEAssistanceInformation message based on a prediction of a risk of collision according to surrounding information and the mobility information,
wherein the safety message is transmitted at a transmission power and transmission interval changed by the reconfiguration information.
2 . The method of claim 1 , wherein the transmission interval is reduced by the reconfiguration information, and
wherein the transmission power is increased by the reconfiguration information.
3 . The method of claim 1 , wherein the reconfiguration information increases a minimum value of the transmission power for the safety message.
4 . The method of claim 1 , wherein a minimum value of the transmission power for the safety message is changed to a value corresponding to a maximum value of the transmission power for the safety message by the reconfiguration information.
5 . The method of claim 1 , wherein the safety message is transmitted at a maximum transmission power by p0-UE-PUSCH-Persistent and p0-NominalPUSCH-Persistent included in the reconfiguration information.
6 . The method of claim 1 , wherein the safety message is transmitted at a maximum transmission power according to values of p0SL-V2V and alphaSL-V2V included in the reconfiguration information.
7 . The method of claim 1 , wherein the reconfiguration information is included in an RRCConnectionReconfiguration message and transmitted through RRC signaling.
8 . The method of claim 1 , wherein the transmission interval of the safety message is set to a shortest transmission interval among a plurality of transmission intervals configurable for the VRU by the device according to the reconfiguration information.
9 . The method of claim 1 , wherein the surrounding information is acquired from at least one of a cooperative awareness message (CAM), a decentralised environmental notification message (DENM), or a threat notification message (TNM).
10 . The method of claim 1 , wherein the surrounding information is acquired from a VRU public safety service center.
11 . The method of claim 1 , wherein the VRU device transmits the UEAssistanceInformation message including information indicating release of the risk situation to the device when the detected risk situation ends.
12 . A method for reconfiguring a transmission parameter for a safety message by a device in a wireless communication system supporting sidelink, the method comprising:
receiving, from a first vulnerable road user (VRU) device, state information indicating detection of a risk situation;
transmitting, to the first VRU device, first reconfiguration information for reconfiguring a transmission parameter for a safety message of the first VRU device based on the state information; and
transmitting, to a second VRU device, second reconfiguration information for reconfiguring a transmission parameter for a safety message of a second VRU device, the second VRU device not having transmitted the state information,
wherein the state information is received through a UEAssistanceInformation message,
wherein the first reconfiguration information decreases a transmission interval for the safety message of the first VRU device while increasing a transmission power for the safety message of the first VRU device, and
wherein the second reconfiguration information increases a transmission interval for the safety message of the second VRU device while decreasing a transmission power for the safety message of the second VRU device.
13 . A vulnerable road user (VRU) device for transmitting a safety message in a wireless communication system supporting sidelink, the VRU device comprising:
a radio frequency (RF) transceiver; and
a processor connected to the RF transceiver,
wherein the processor is configured to:
transmit state information to a device based on mobility information;
receive reconfiguration information about transmission parameters from the device; and
transmit a safety message based on the reconfiguration information,
wherein the state information is included and transmitted in a UEAssistanceInformation message based on a prediction of a risk of collision according to surrounding information and the mobility information,
wherein the safety message is transmitted at a transmission power and transmission interval changed by the reconfiguration information.