Method and apparatus for reporting HARQ feedback in NR V2X
A first apparatus performs wireless communication by receiving an RRC message including information related to a first sidelink (SL) resource; receiving first DCI related to activation of the first SL resource via a first PDCCH at a first time, the first DCI including information related to a first PUCCH resource for reporting HARQ feedback; receiving second DCI related to release of the first SL resource via a second PDCCH at a second time; transmitting, to a second apparatus, a transport block (TB) via a physical sidelink shared channel (PSSCH) based on the first SL resource between the second time and a third time; and transmitting, to a base station, the HARQ feedback for the TB based on the first PUCCH resource. The first SL resource is released from the third time, the first time is before the second time, and the second time is before the third time.
1. A method for performing, by a first apparatus, wireless communication, the method comprising:
receiving a radio resource control (RRC) message including information related to a first sidelink (SL) resource from a base station;
receiving first downlink control information (DCI) related to an activation of the first SL resource at a first time point from the base station, through a first physical downlink control channel (PDCCH), wherein the first DCI includes information related to a first physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information;
receiving second DCI related to a release of the first SL resource at a second time point from the base station, through a second PDCCH;
transmitting a transport block (TB) between the second time point and a third time point, to a second apparatus through a physical sidelink shared channel (PSSCH) based on the first SL resource; and
transmitting HARQ feedback information for the TB to the base station based on the first PUCCH resource,
wherein the first SL resource is released from the third time point,
wherein the first time point is before the second time point, and wherein the second time point is before the third time point,
wherein the HARQ feedback information for the TB is NACK information, regardless of whether the first apparatus succeeds in the transmission of the TB, and
wherein a second SL resource for retransmitting the TB in response to the NACK information is not allocated by the base station, from a fourth time point when the base station determines that the first apparatus has received the second DCI.
2. The method of claim 1 , wherein the second DCI doesn't include information related to a PUCCH resource for reporting HARQ feedback information.
3. The method of claim 1 , wherein the first SL resource is a resource allocated periodically, and
wherein a transmission of a different TB on a plurality of resources included in one period, among the first SL resource is not allowed.
4. The method of claim 1 , wherein the first SL resource is a resource allocated periodically, and
wherein a transmission of a different TB on a plurality of resources included in one period, among the first SL resource is allowed.
5. A first apparatus for performing wireless communication, the first apparatus 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:
receive a radio resource control (RRC) message including information related to a first sidelink (SL) resource from a base station;
receive first downlink control information (DCI) related to an activation of the first SL resource at a first time point from the base station, through a first physical downlink control channel (PDCCH), wherein the first DCI includes information related to a first physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information;
receive second DCI related to a release of the first SL resource at a second time point from the base station, through a second PDCCH;
transmit a transport block (TB) between the second time point and a third time point, to a second apparatus through a physical sidelink shared channel (PSSCH) based on the first SL resource; and
transmit HARQ feedback information for the TB to the base station based on the first PUCCH resource,
wherein the first SL resource is released from the third time point,
wherein the first time point is before the second time point, and wherein the second time point is before the third time point,
wherein the HARQ feedback information for the TB is NACK information, regardless of whether the first apparatus succeeds in the transmission of the TB, and
wherein a second SL resource for retransmitting the TB in response to the NACK information is not allocated by the base station, from a fourth time point when the base station determines that the first apparatus has received the second DCI.
6. An apparatus configured to control a first user equipment (UE), the apparatus 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:
receive a radio resource control (RRC) message including information related to a first sidelink (SL) resource from a base station;
receive first downlink control information (DCI) related to an activation of the first SL resource at a first time point from the base station, through a first physical downlink control channel (PDCCH), wherein the first DCI includes information related to a first physical uplink control channel (PUCCH) resource for reporting hybrid automatic repeat request (HARQ) feedback information;
receive second DCI related to a release of the first SL resource at a second time point from the base station, through a second PDCCH;
transmit a transport block (TB) between the second time point and a third time point, to a second UE through a physical sidelink shared channel (PSSCH) based on the first SL resource; and
transmit HARQ feedback information for the TB to the base station based on the first PUCCH resource,
wherein the first SL resource is released from the third time point,
wherein the first time point is before the second time point, and wherein the second time point is before the third time point,
wherein the HARQ feedback information for the TB is NACK information, regardless of whether the first UE succeeds in the transmission of the TB, and
wherein a second SL resource for retransmitting the TB in response to the NACK information is not allocated by the base station, from a fourth time point when the base station determines that the first UE has received the second DCI.