Method for reserving finite number of resources used for performing V2X communication in wireless communication system, and terminal using same
The present invention provides a vehicle-to-X (V2X) operation method performed by a V2X terminal in a wireless communication system, the method comprising: reserving a finite number of resources used for performing a V2X communication; and performing the V2X communication on the finite number of reserved resources.
1. A method of performing, by a device, vehicle-to-everything (V2X) communication in a wireless communication system, the method comprising:
determining a first plurality of V2X resources with which to perform the V2X communication;
determining that a threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources; and
based on the threshold period of time having elapsed in which the device has not performed V2X communication using the first plurality of V2X resources, selecting a second plurality of V2X resources with which to perform the V2X communication,
wherein selecting the second plurality of V2X resources comprises:
selecting a finite number of the second plurality of V2X resources that is proportional to a counter value that is randomly selected from a range of values.
2. The method of claim 1 , wherein the counter value is randomly selected in the range of values that is greater than or equal to 5 and less than or equal to 15.
3. The method of claim 1 , wherein the finite number of the second plurality of V2X resources is ten times the counter value.
4. The method of claim 1 , wherein selecting the second plurality of V2X resources with which to perform the V2X communication comprises:
randomly selecting the second plurality of V2X resources from among a resource pool with equal probability.
5. The method of claim 1 , further comprising:
performing a plurality of V2X communications using the first plurality of V2X resources,
wherein determining that the threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources comprises:
determining that the threshold period of time has elapsed in which the device has not performed any of the plurality of V2X communications using the first plurality of V2X resources.
6. The method of claim 5 , wherein performing the plurality of V2X communications using the first plurality of V2X resources comprises:
performing the plurality of V2X communications using a subset of the first plurality of V2X resources.
7. The method of claim 1 , wherein determining that the threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources comprises:
determining that a transmission buffer for the V2X communication has been empty during the threshold period of time.
8. The method of claim 1 , further comprising:
based on (i) a sidelink grant not having been configured for the V2X communication for the device, or (ii) a number of consecutive unused V2X communication opportunities reaching a threshold number:
selecting a third plurality of V2X resources with which to perform the V2X communication.
9. The method of claim 1 , wherein selecting the second plurality of V2X resources comprises:
sensing, during a sensing duration, an availability of the second plurality of V2X resources to perform V2X communication; and
selecting, during a selection duration that follows the sensing duration, the second plurality of V2X resources to perform the V2X communication.
10. A device configured to perform vehicle-to-everything (V2X) communication in a wireless communication system, the device comprising:
a radio frequency (RF) transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
determining a first plurality of V2X resources with which to perform V2X communication;
determining that a threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources; and
based on the threshold period of time having elapsed in which the device has not performed V2X communication using the first plurality of V2X resources, selecting a second plurality of V2X resources with which to perform the V2X communication,
wherein selecting the second plurality of V2X resources comprises:
selecting a finite number of the second plurality of V2X resources that is proportional to a counter value that is randomly selected from a range of values.
11. The device of claim 10 , wherein the counter value is randomly selected in the range of values that is greater than or equal to 5 and less than or equal to 15.
12. The device of claim 10 , wherein the finite number of the second plurality of V2X resources is ten times the counter value.
13. The device of claim 10 , wherein selecting the second plurality of V2X resources with which to perform the V2X communication comprises:
randomly selecting the second plurality of V2X resources from among a resource pool with equal probability.
14. The device of claim 10 , wherein the operations further comprise:
performing a plurality of V2X communications using the first plurality of V2X resources,
wherein determining that the threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources comprises:
determining that the threshold period of time has elapsed in which the device has not performed any of the plurality of V2X communications using the first plurality of V2X resources.
15. The device of claim 14 , wherein performing the plurality of V2X communications using the first plurality of V2X resources comprises:
performing the plurality of V2X communications using a subset of the first plurality of V2X resources.
16. The device of claim 10 , wherein determining that the threshold period of time has elapsed in which the device has not performed V2X communication using the first plurality of V2X resources comprises:
determining that a transmission buffer for the V2X communication has been empty during the threshold period of time.
17. The device of claim 10 , wherein the operations further comprise:
based on (i) a sidelink grant not having been configured for the V2X communication for the device, or (ii) a number of consecutive unused V2X communication opportunities reaching a threshold number:
selecting a third plurality of V2X resources with which to perform the V2X communication.
18. The device of claim 10 , wherein selecting the second plurality of V2X resources comprises:
sensing, during a sensing duration, an availability of the second plurality of V2X resources to perform V2X communication; and
selecting, during a selection duration that follows the sensing duration, the second plurality of V2X resources to perform the V2X communication.