Method and device for resource in sidelink communication
Disclosed are a method and device for resource selection in sidelink communication. An operation method of a first transmission terminal comprises the steps of: checking the congestion level in one or more measurement areas; selecting a first resource selection area from among a plurality of resource selection areas when the congestion level is at least a first reference value; selecting a transmission resource within the first resource selection area; and performing sidelink communication with a reception terminal by using the transmission resource.
1 . An operation method of a first transmitting terminal in a communication system, the operation method comprising:
identifying a congestion level in one or more measurement regions;
selecting a first resource selection region from among a plurality of resource selection regions, when the congestion level is greater than or equal to a first reference value;
selecting a transmission resource within the first resource selection region; and
performing sidelink communication with a receiving terminal using the transmission resource,
wherein a size of the first resource selection region is different from a size of a second resource selection region selected from among the plurality of resource selection regions when the congestion level is less than the first reference value.
2 . The operation method according to claim 1 , further comprising receiving, from a base station, mapping relationship information between congestion levels and the plurality of resource selection regions, wherein each of the first resource selection region and the second resource selection region is selected based on the mapping relationship information.
3 . The operation method according to claim 1 , wherein the congestion level is determined based on a ratio between the one or more measurement regions and at least one measurement region determined to be congested among the one or more measurement regions.
4 . The operation method according to claim 1 , wherein a degree of congestion when the congestion level is equal to or greater than the first reference value is higher than a degree of congestion when the congestion level is less than the first reference value, and the size of the first resource selection region is greater than the size of the second resource selection region.
5 . The operation method according to claim 1 , wherein the first resource selection region includes a first part that does not overlap with the second resource selection region and a second part that overlaps with the second resource selection region, and a probability of selecting the transmission resource from the first part is configured to be higher than a probability of selecting the transmission resource from the second part.
6 . The operation method according to claim 1 , further comprising receiving, from a base station, configuration information of the one or more measurement regions and configuration information of the plurality of resource selection regions.
7 . The operation method according to claim 1 , wherein the plurality of resource selection regions for the first transmitting terminal are configured independently of a plurality of resource selection regions for a second transmitting terminal.
8 . An operation method of a transmitting terminal in a communication system, the operation method comprising:
performing a first sidelink communication procedure with a receiving terminal by using a resource selection region #n among a plurality of resource selection regions;
changing a resource selection region from the resource selection region #n to a resource selection region #k based on one or more hybrid automatic repeat request (HARQ) responses received in the first sidelink communication procedure; and
performing a second sidelink communication procedure with the receiving terminal using the resource selection region #k among the plurality of resource selection regions,
wherein a size of the resource selection region #n is different from a size of the resource selection region #k, and each of n and k is a natural number.
9 . The operation method according to claim 8 , wherein when the one or more HARQ responses are p consecutive acknowledgments (ACKs), a resource selection region used for the second sidelink communication procedure is determined as the resource selection region #k smaller than the resource selection region #n, wherein p is a natural number.
10 . The operation method according to claim 8 , wherein when the one or more HARQ responses are j consecutive negative ACKs (NACKs), a resource selection region used for the second sidelink communication procedure is determined as the resource selection region #k greater than the resource selection region #n, wherein j is a natural number.
11 . The operation method according to claim 8 , further comprising receiving, from a base station, mapping relationship information between the one or more HARQ responses and the plurality of resource selection regions, wherein the resource selection region #k is determined based on the mapping relationship information.
12 . The operation method according to claim 8 , wherein the second sidelink communication procedure is performed using a transmission resource selected within the resource selection region #k, the resource selection region #k includes a first part that does not overlap with the resource selection region #n and a second part that overlaps the resource selection region #n, and a probability of selecting the transmission resource from the first part is configured to be higher than a probability of selecting the transmission resource from the second part.
13 . An operation method of a transmitting terminal in a communication system, the operation method comprising:
selecting a first resource selection region mapped to a first cast type from among a plurality of resource selection regions;
selecting a transmission resource within the first resource selection region; and
performing sidelink communication with a receiving terminal based on the first cast type using the transmission resource,
wherein a size of the first resource selection region is different from a size of a second resource selection region mapped to a second cast type among the plurality of resource selection regions.
14 . The operation method according to claim 13 , further comprising receiving, from a base station, mapping relationship information between a plurality of cast types including the first cast type and the second cast type and the plurality of resource selection regions, wherein the first resource selection region is determined based on the mapping relationship information.
15 . The operation method according to claim 13 , wherein the first cast type is broadcast, groupcast, or unicast, and the second cast type is different from the first cast type.
16 . The operation method according to claim 15 , wherein a resource selection region for broadcast is a largest resource selection region among the plurality of resource selection regions, and a resource selection region for unicast is a smallest resource selection region among the plurality of resource selection regions.
17 . The operation method according to claim 13 , further comprising receiving, from a base station, configuration information of the plurality of resource selection regions, wherein the configuration information includes at least one of an identifier of each of the plurality of resource selection regions, information of a resource pool in which the plurality of resource selection regions are configured, time resource information of the plurality of resource selection regions, frequency resource information of the plurality of resource selection regions, or combinations thereof.
18 . An operation method of a transmitting terminal in a communication system, the operation method comprising:
selecting a first resource selection region mapped to a first priority of first data from among a plurality of resource selection regions;
selecting a transmission resource within the first resource selection region; and
transmitting the first data to a receiving terminal using the transmission resource,
wherein a size of the first resource selection region is different from a size of a second resource selection region mapped to a second priority of second data among the plurality of resource selection regions.
19 . The operation method according to claim 18 , further comprising receiving, from a base station, mapping relationship information between a plurality of priorities including the first priority and the second priority and the plurality of resource selection regions, wherein the first resource selection region is determined based on the mapping relationship information.
20 . The operation method according to claim 18 , wherein when the first priority is higher than the second priority, the size of the first resource selection region mapped to the first priority is greater than the size of the second resource selection region mapped to the second priority.