Methods and apparatus for resource selection of sidelink
Embodiments of the present application relate to a method and an apparatus for resource selection on NR sidelink. According to an embodiment of the present application, a method can include: receiving resource selection controlling information; and determining one or more candidate resources in a resource selection window of a resource pool for a physical sidelink control channel (PSCCH) transmission and/or a physical sidelink shared channel (PSSCH) transmission based on the resource selection controlling information. Embodiments of the present application can save power for VRUs as well as decrease resource collision between the traffics affected by the resource selection controlling information.
1 . A method performed by a user equipment (UE), the method comprising:
receiving resource selection controlling information;
receiving an indication of a set of candidate resources for at least one of a physical sidelink control channel (PSCCH) transmission or a physical sidelink shared channel (PSSCH) transmission, a resource selection method, and a traffic priority of a second UE, wherein the indication is received when triggering a resource selection or a resource reselection at a time instance of a resource selection window of a resource pool, wherein the resource pool is overlapping with one or more resources for sidelink communication;
when the resource selection method of the second UE is a partial sensing based resource selection method, comparing the traffic priority of the second UE with a traffic priority of the UE;
when the traffic priority of the second UE is higher than the traffic priority of the UE, decreasing a selection opportunity for the set of candidate resources indicated in the indication; and
determining one or more candidate resources from the set of candidate resources in the resource selection window of the resource pool for at least one of the PSCCH transmission or the PSSCH transmission based on the resource selection controlling information.
2 . The method of claim 1 , wherein the resource selection controlling information is included in resource selection configuration information for configuring the resource pool.
3 . The method of claim 1 , wherein the resource selection controlling information is included in zone configuration information.
4 . The method of claim 1 , wherein the resource selection controlling information is transmitted by system information, a radio resource control (RRC) signaling, a medium access control (MAC) control element (CE), or a physical layer signalling.
5 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive resource selection controlling information;
receive an indication of a set of candidate resources for at least one of a physical sidelink control channel (PSCCH) transmission or a physical sidelink shared channel (PSSCH) transmission, a resource selection method, and a traffic priority of a second UE, wherein the indication is received when triggering a resource selection or a resource reselection at a time instance of a resource selection window of a resource pool, wherein the resource pool is overlapping with one or more resources for sidelink communication;
when the resource selection method of the second UE is a partial sensing based resource selection method, compare the traffic priority of the second UE with a traffic priority of the UE;
when the traffic priority of the second UE is higher than the traffic priority of the UE, decrease a selection opportunity for the set of candidate resources indicated in the indication; and
determine one or more candidate resources from the set of candidate resources in the resource selection window of the resource pool for at least one of the PSCCH transmission or the PSSCH transmission based on the resource selection controlling information.
6 . The UE of claim 5 , wherein the resource selection controlling information indicates at least one resource selection probability, wherein each of the at least one resource selection probability is associated with at least one of: a traffic type, a traffic priority, a transmission type, a resource selection method, and a resource.
7 . The UE of claim 6 , wherein the traffic type is one of:
a periodic traffic type, an aperiodic traffic type, a pedestrian to everything (P2X) traffic type, and a vehicle to everything (V2X) traffic type.
8 . The UE of claim 6 , wherein the traffic priority is one of:
a ProSe Per-Packet Priority (PPPP) defined in long term evolution (LTE) sidelink and a priority defined in PC5 5G QoS Identifier (PQI).
9 . The UE of claim 6 , wherein the transmission type is one of an initial transmission type and a retransmission type.
10 . The UE of claim 6 , wherein the resource includes at least one of:
one or more single-subframe resources;
one or more subframes; and
one or more sets of subframes.
11 . The UE of claim 6 , wherein the at least one processor is further configured to cause the UE to:
for each resource:
generate a random probability value between 0 and 1;
in a case that the random probability value is larger than or equal to a value of a resource selection probability associated with the resource, include the resource in the one or more candidate resources; and
in a case that the random probability value is less than the value of the resource selection probability, exclude the resource from the one or more candidate resources.
12 . The UE of claim 5 , wherein the resource selection controlling information indicates a resource selection sequence for a group of resources, wherein the resource selection sequence is associated with at least one of: a traffic type, a traffic priority, a transmission type, or a resource selection method.
13 . The UE of claim 12 , wherein the resource selection sequence comprises an ordered sequence of indices, wherein each index corresponds to a resource of the group of resources.
14 . The UE of claim 12 , wherein the at least one processor is further configured to cause the UE to:
order the one or more candidate resources according to the resource selection sequence; and
select resource for at least one of the PSCCH transmission or the PSSCH transmission according to the ordered one or more candidate resources.
15 . The UE of claim 5 , wherein the indication indicates the traffic priority of the UE.
16 . The UE of claim 5 , wherein the at least one processor is further configured to cause the UE to:
use the resource selection controlling information associated with the set of candidate resources to determine the one or more candidate resources.
17 . A base station for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
generate resource selection controlling information for a user equipment (UE), wherein the resource selection controlling information is used for the UE to determine one or more candidate resources in a resource selection window of a resource pool for at least one of a physical sidelink control channel (PSCCH) transmission or a physical sidelink shared channel (PSSCH) transmission, and wherein the resource pool is overlapping with one or more resources for sidelink communication; and
transmit the resource selection controlling information to the UE, wherein, when a resource selection method of a second UE is a partial sensing based resource selection method, a traffic priority of the second UE with a traffic priority of the UE, and when the resource selection method of the second UE is the partial sensing based resource selection method and the traffic priority of the second UE is higher than the traffic priority of the UE, a selection opportunity for the one or more candidate resources by the UE is decreased.
18 . The base station of claim 17 , wherein the resource selection controlling information is included in resource selection configuration information for configuring the resource pool.
19 . The base station of claim 17 , wherein the resource selection controlling information is included in zone configuration information.
20 . A method performed by a base station, the method comprising:
generating resource selection controlling information for a user equipment (UE), wherein the resource selection controlling information is used for the UE to determine one or more candidate resources in a resource selection window of a resource pool for at least one of a physical sidelink control channel (PSCCH) transmission or a physical sidelink shared channel (PSSCH) transmission, and wherein the resource pool is overlapping with one or more resources for sidelink communication; and
transmitting the resource selection controlling information to the UE, wherein, when the resource selection method of a second UE is a partial sensing based resource selection method, a traffic priority of the second UE with a traffic priority of the UE, and when a resource selection method of the second UE is the partial sensing based resource selection method and the traffic priority of the second UE is higher than the traffic priority of the UE, a selection opportunity for the one or more candidate resources by the UE is decreased.