Method for terminal to transmit and receive sidelink signal in wireless communication system supporting sidelink, and device for same
Disclosed are: a method for a terminal to transmit a sidelink signal in a wireless communication system that supports sidelink according to various embodiments; and a device for same. Disclosed are a method for a terminal to transmit a sidelink signal and a device for same, the method including: a step for determining a plurality of candidate resources on the basis of reserved resources sensed in a predetermined resource pool and the reception intensities of received signals; a step for determining, on the basis of the attributes of a sidelink signal or the attributes of packets included in the sidelink signal, whether to perform additional carrier sensing for selecting a transmission resource from among the plurality of candidate resources; a step in which if the carrier sensing is performed, the transmission resource is selected after performing the carrier sensing on the plurality of candidate resources until a prescribed timing; and a step in which the sidelink signal is transmitted from the selected transmission resource.
1. A method of transmitting a sidelink signal by a user equipment (UE) in a wireless communication system supporting sidelink, the method comprising:
performing a synchronization for a sidelink communication;
receiving configuration information for configuring a resource pool including a plurality of sub-channels for sidelink communication;
determining a plurality of candidate resources based on reserved resources sensed from the resource pool and a received strength of a signal;
based on an attribute of a packet included in the sidelink signal, determining to perform additional carrier sensing for selecting a transmission resource from among the plural candidate resources;
based on performing the carrier sensing, selecting the transmission resource; and
transmitting the sidelink signal based on the selected transmission resource,
wherein the additional carrier sensing is performed based on a back-off counter that is backed off by a detection of a reception strength below a specific threshold for each of the plurality of sub-channels, and
wherein a counter value of the back-off counter is selected within a differently configured a counter range based on the attribute of the packet.
2. The method of claim 1 ,
wherein the attribute of the packet is at least one of periodicity of the packet, priority of the packet, or a latency requirement and reliability demanded for the packet.
3. The method of claim 2 ,
wherein whether to perform the carrier sensing is determined based on a result of comparing a preset threshold time with a time from a specific timing to a timing at which latency of transmission of the packet according to the latency requirement is permitted.
4. The method of claim 1 ,
wherein the resource pool is determined based on the attribute of the packet among a plurality of resource pools.
5. The method of claim 1 ,
wherein, based on non-demand for periodic transmission of the packet, the transmission resource is selected after the carrier sensing is performed until the predetermined timing based on the back-off counter.
6. The method of claim 1 ,
wherein, based on priority of the packet equal to or higher than a preset threshold, the transmission resource is selected after the carrier sensing is performed based on the back-off counter.
7. The method of claim 1 ,
wherein, based on a latency requirement for the packet less than a preset latency time, the transmission resource is selected after the carrier sensing is performed based on the back-off counter.
8. An apparatus for transmitting a sidelink signal in a wireless communication system supporting sidelink, the apparatus comprising:
a processor; and
a memory connected to the processor,
wherein the processor is configured to:
perform a synchronization for a sidelink communication;
receive configuration information for configuring a resource pool including a plurality of sub-channels for sidelink communication;
determine a plurality of candidate resources based on reserved resources sensed from the resource pool and a received strength of a signal,
based on an attribute of a packet included in the sidelink signal, determine to perform additional carrier sensing for selecting a transmission resource from among the plural candidate resources,
based on performing the carrier sensing, select the transmission resource after performing the carrier sensing for the plural candidate resources until a predetermined timing,
transmit the sidelink signal based on the selected transmission resource,
wherein the additional carrier sensing is performed based on a back-off counter that is backed off by a detection of a reception strength below a specific threshold for each of the plurality of sub-channels, and
wherein a counter value of the back-off counter is selected within a differently configured a counter range based on the attribute of the packet.