Method and device for connecting resources through resource reselection under SL DRX operation in NR V2X
Proposed is an operation method of a first device ( 100 ) in a wireless communication system. The method may comprise the steps of: selecting, in a resource selection window, a first resource and a second resource included in a first active time including the time when a timer, which is related to an SL DRX configuration of a second device ( 200 ) and to an active time included in the SL DRX configuration, was to have operated on the basis of reception performed on the basis of the first resource; and reselecting the first resource as a third resource in the resource selection window, wherein the third resource causes the second resource to be included in a second active time including the time when the timer related to the active time operates on the basis of reception performed on the basis of the third resource.
1 . A method for performing, by a first device, wireless communication, the method comprising:
obtaining a sidelink (SL) discontinuous reception (DRX) configuration related to a second device;
selecting a first resource included within a first active time related to the SL DRX configuration, for a transmission of a first medium access control (MAC) protocol data unit (PDU),
wherein the first active time includes a time during which a timer started based on a time of the first resource is running;
transmitting, to the second device, first sidelink control information (SCI) including information related to the first resource; and
reselecting the first resource to a third resource after the first resource within the first active time, based on pre-emption for the first resource.
2 . The method of claim 1 , wherein a second resource included within the first active time is selected along with the first resource,
wherein the second resource is included within a second active time related to the SL DRX configuration and the first active time, and
wherein the second active time includes a time during which a timer started based on a time of the third resource is running.
3 . The method of claim 2 , further comprising:
transmitting, to the second device, second SCI including information related to the second resource.
4 . The method of claim 3 , wherein the reselection is performed based on a transmission of the second SCI.
5 . The method of claim 1 , wherein the first active time includes a time during which a timer related to an active time of the SL DRX configuration is running based on a reception of a second MAC PDU different from the first MAC PDU.
6 . The method of claim 1 , further comprising:
transmitting, to the second device, second SCI for scheduling of a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on the third resource; and
transmitting, to the second device, the first MAC PDU through the PSSCH, based on the third resource.
7 . The method of claim 1 , further comprising:
determining an occurrence of discontinuous transmission (DTX) based on a hybrid automatic repeat request (HARQ) feedback related to the first SCI being not able to be received from the second device,
wherein the reselection is performed based on the DTX.
8 . The method of claim 1 , wherein the reselection is performed based on a resource reservation interval value included in the first SCI being 0.
9 . The method of claim 1 , wherein the reselection is performed based on a physical sidelink feedback channel (PSFCH) resource related to the first SCI being not included within a third active time of the first device.
10 . The method of claim 1 , wherein the reselection is performed based on an interval between resources selected based on the resource selection related to the first resource being greater than a retransmission timer value of the SL DRX configuration.
11 . The method of claim 1 , wherein a second resource included within the first active time is selected along with the first resource,
wherein the first resource is included within an on-duration timer duration of the SL DRX configuration,
wherein the second resource is not included within the on-duration timer duration, and
wherein an interval between the first resource and the second resource is less than or equal to a threshold value.
12 . The method of claim 11 , wherein the first resource is a last resource included within the on-duration timer duration among resources selected based on the resource selection related to the first resource and the second resource, and
wherein the second resource is a first resource not included within the on-duration timer duration among the resources selected based on the resource selection.
13 . The method of claim 1 , wherein the SL DRX configuration includes information for a timer related to an active time, and
wherein the timer related to an active time includes an SL DRX inactivity timer or an SL DRX retransmission timer.
14 . A first device for performing wireless communication, the first device comprising:
one or more memories storing instructions;
one or more transceivers; and
one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
obtain a sidelink (SL) discontinuous reception (DRX) configuration related to a second device;
select a first resource included within a first active time related to the SL DRX configuration, for a transmission of a first medium access control (MAC) protocol data unit (PDU),
wherein the first active time includes a time during which a timer started based on a time of the first resource is running;
transmit, to the second device, first sidelink control information (SCI) including information related to the first resource; and
reselect the first resource to a third resource after the first resource within the first active time, based on pre-emption for the first resource.
15 . A device adapted to control a first user equipment (UE), the device comprising:
one or more processors; and
one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
obtain a sidelink (SL) discontinuous reception (DRX) configuration related to a second UE;
select a first resource included within a first active time related to the SL DRX configuration, for a transmission of a first medium access control (MAC) protocol data unit (PDU),
wherein the first active time includes a time during which a timer started based on a time of the first resource is running;
transmit, to the second UE, first sidelink control information (SCI) including information related to the first resource; and
reselect the first resource to a third resource after the first resource within the first active time, based on pre-emption for the first resource.