Method and device for selecting resource in NR V2X
A method by which a first device performs wireless communication and a device for supporting same. The method includes acquiring a media access control (MAC) protocol data unit (PDU); determining a priority value related to the MAC PDU; triggering resource selection in a slot; determining a plurality of candidate slots within a selection window determined on the basis of the slot; monitoring a plurality of slots related to the plurality of candidate slots; determining a plurality of candidate resources within the plurality of candidate slots on the basis of the monitoring; and selecting a plurality of sidelink (SL) resources from among the plurality of candidate resources, wherein the time interval between the plurality of SL resources can be determined on the basis of the priority value related to the MAC PDU.
1 . A method comprising:
obtaining, by a device, a media access control (MAC) protocol data unit (PDU);
determining, by the device, a priority value related to the MAC PDU;
triggering, by the device, resource selection in a slot;
determining, by the device, candidate slots within a selection window related to the slot;
monitoring, by the device, slots related to the candidate slots;
determining, by the device, candidate resources within the candidate slots based on the monitoring; and
selecting, by the device, a plurality of resources from the candidate resources,
wherein, based on that the priority value is less than or equal to a threshold priority value, a time interval between the plurality of resources is determined to be greater than or equal to a threshold time interval.
2 . The method of claim 1 , wherein the threshold priority value is configured for a resource pool.
3 . The method of claim 1 , wherein, based on that the priority value is less than or equal to the threshold priority value, the device selects the plurality of resources such that the time interval between the plurality of resources is greater than or equal to the threshold time interval.
4 . The method of claim 1 , wherein, based on that the priority value is greater than the threshold priority value, the time interval between the plurality of resources is determined regardless of the threshold time interval.
5 . The method of claim 1 , wherein the time interval between the plurality of resources is determined based on a resource selection method of the first device.
6 . The method of claim 1 , wherein, based on that a resource selection method is a partial sensing-based resource selection method or a random selection-based resource selection method, the time interval between the plurality of resources is determined to be less than or equal to the threshold time interval.
7 . The method of claim 6 , wherein the threshold time interval is configured to be greater than or equal to a hybrid automatic repeat request (HARQ) round-trip time (RTT) time.
8 . The method of claim 1 , wherein, based on that the time interval between the plurality of resources is less than or equal to the threshold time interval, HARQ feedback is enabled for transmission on a last resource of the plurality of resources, and HARQ feedback is disabled for transmission on remaining resources of the plurality of resources.
9 . The method of claim 8 , wherein the plurality of resources are included in a resource group for same transport block (TB) transmission.
10 . The method of claim 1 , wherein, based on that a number of the candidate slots is less than or equal to a minimum number of candidate slots, the plurality of resources are selected based on random selection from a resource pool or an exceptional resource pool.
11 . The method of claim 1 , wherein, based on that a number of candidate slots in which a result of partial sensing is available among the candidate slots is less than or equal to a minimum number of candidate slots, the plurality of resources are selected based on random selection from a resource pool or an exceptional resource pool.
12 . The method of claim 1 , wherein a time interval between an initial resource and a last resource among the plurality of resources is selected to be less than or equal to a value of a discontinuous reception (DRX) retransmission timer configured for the device or a receiving device related to the device.
13 . A device, comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the device to perform operations comprising:
obtaining a media access control (MAC) protocol data unit (PDU);
determining a priority value related to the MAC PDU;
triggering resource selection in a slot;
determining candidate slots within a selection window related to the slot;
monitoring slots related to the candidate slots;
determining candidate resources within the candidate slots based on the monitoring; and
selecting a plurality of resources from the candidate resources,
wherein, based on that the priority value is less than or equal to a threshold priority value, a time interval between the plurality of resources is determined to be greater than or equal to a threshold time interval.
14 . The device of claim 13 , wherein the threshold priority value is configured for a resource pool.
15 . The device of claim 13 , wherein, based on that the priority value is less than or equal to the threshold priority value, the device selects the plurality of resources such that the time interval between the plurality of resources is greater than or equal to the threshold time interval.
16 . A processing device, comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause a device to perform operations comprising:
obtaining a media access control (MAC) protocol data unit (PDU);
determining a priority value related to the MAC PDU;
triggering resource selection in a slot;
determining candidate slots within a selection window related to the slot;
monitoring slots related to the candidate slots;
determining candidate resources within the candidate slots based on the monitoring; and
selecting a plurality of resources from the candidate resources,
wherein, based on that the priority value is less than or equal to a threshold priority value, a time interval between the plurality of resources is determined to be greater than or equal to a threshold time interval.
17 . The processing device of claim 16 , wherein the threshold priority value is configured for a resource pool.
18 . The processing device of claim 16 , wherein, based on that the priority value is less than or equal to the threshold priority value, the device selects the plurality of resources such that the time interval between the plurality of resources is greater than or equal to the threshold time interval.