Method and apparatus for operating resource selection and HARQ operation in NR V2X
A method for performing wireless communication by a first apparatus is proposed. The method may comprise the steps of: receiving a configured grant (CG) from a base station, wherein the CG includes information about a physical uplink control channel (PUCCH) resource associated with a sidelink; on the basis of the CG, transmitting a physical sidelink control channel (PSCCH) to a second apparatus; on the basis of the CG, transmitting, to the second apparatus, a physical sidelink shared channel (PSSCH) associated with the PSCCH, wherein SL hybrid automatic repeat request (HARQ) feedback is disabled; and on the basis of a retransmission associated with the PSSCH, having not been requested, transmitting an acknowledgement (ACK) to the base station via the PUCCH resource.
1. A method for performing wireless communication by a first device, the method comprising:
transmitting, to a second device, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH); and
transmitting, to the second device, data through the PSSCH,
wherein the SCI includes a field related to a first resource reservation period,
wherein the first resource reservation period is time period,
wherein the first resource reservation period is one of a plurality of candidate resource reservation periods related to a resource pool configured to the first device,
wherein a bit size of the field corresponds to a number of the candidate resource reservation periods related to the resource pool configured to the first device according to a log 2 relationship, and
wherein the log 2 relationship is X=log 2 N, wherein X is the bit size of the field and N is the number of the candidate resource reservation periods related to the resource pool configured to the first device.
2. The method of claim 1 ,
wherein a number of the plurality of candidate resource reservation periods is less than or equal to a maximum number of candidate resource reservation periods.
3. The method of claim 1 ,
wherein the first resource reservation period is one of a plurality of the candidate resource reservation periods related to the pool in a predetermined order, and
wherein the predetermined order is an ascending order from a smallest candidate resource reservation period related to the resource pool to a largest candidate resource reservation period related to the resource pool.
4. The method of claim 1 , further comprising:
sensing transmission resources based on a first priority;
selecting a first transmission resource to a second transmission resource based on the sensing; and
reselecting the first transmission resource based on the first transmission resource being overlapped with a third transmission resource to be used by the second device,
wherein the SCI includes information for sharing the first transmission resource with other devices.
5. The method of claim 4 , wherein a second priority of a first packet to be transmitted in the third transmission resource is higher than a pre-configured priority.
6. The method of claim 5 , further comprising:
comparing the second priority of the first packet to be transmitted in the third transmission resource with the first priority when a second packet to be transmitted in the first transmission resource is not transmitted,
wherein the second priority of the first packet to be transmitted in the third transmission resource is higher than the first priority.
7. A first device configured to perform wireless communication by a first device and comprising:
a transceiver; and
control circuitry configured to:
control the transceiver to transmit, to a second device, sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH); and
control the transceiver to transmit, to the second device, data through the PSSCH,
wherein the SCI includes a field related to a first resource reservation period,
wherein the first resource reservation period is time period,
wherein the first resource reservation period is one of a plurality of candidate resource reservation periods related to a resource pool configured to the first device,
wherein a bit size of the field corresponds to a number of the candidate resource reservation periods related to the resource pool configured to the first device according to a log 2 relationship, and
wherein the log 2 relationship is X=log 2 N, wherein X is the bit size of the field and N is the number of the candidate resource reservation periods related to the resource pool configured to the first device.
8. The first device of claim 7 ,
wherein the first resource reservation period is one of a plurality of the candidate resource reservation periods related to the pool in a predetermined order, and
wherein the predetermined order is an ascending order from a smallest candidate resource reservation period related to the resource pool to a largest candidate resource reservation period related to the resource pool.