Method and apparatus for NR V2X sidelink HARQ procedure
Apparatuses and methods for obtaining and providing hybrid automatic repeat request acknowledgement (HARQ-ACK) information. A method for providing HARQ-ACK information includes receiving a configuration for a slot offset value and receiving a physical sidelink shared channel (PSSCH) over a number of sub-channels in a first slot. The PSSCH includes a transport block (TB). The method includes determining a second slot as an earliest slot with resources for transmission of a physical sidelink feedback channel (PSFCH) that is after the first slot by a number of slots equal to the slot offset value. The PSFCH includes the HARQ-ACK information that is in response to reception of the TB. The method further includes transmitting the PSFCH in the second slot.
1. A first user equipment (UE) comprising:
a transceiver configured to:
receive a first stage sidelink control information (SCI) format;
receive a second stage SCI format including a zone identifier (ID); and
receive, from a second UE, a physical sidelink shared channel (PSSCH);
a processor operably coupled with the transceiver, the processor configured to determine at least one physical sidelink feedback channel (PSFCH) resource, for a PSFCH transmission as a response to the PSSCH, based on a modulo operation including an ID of a first UE and a number of the at least one PSFCH resource,
wherein the transceiver is further configured to transmit, to the second UE, a PSFCH using the at least one PSFCH resource, and
wherein a presence of the second stage SCI format including the zone ID is indicated by the first stage SCI format.
2. The first UE of claim 1 , wherein:
in a resource pool and within slots associated with the resource pool, the at least one PSFCH resource is configured periodically with a period of N number of slots, and
the at least one PSFCH resource in the resource pool is disabled in case that the N is zero.
3. The first UE of claim 2 , wherein, in case that the N is zero, a PSFCH transmission from the first UE in the resource pool is disabled.
4. The first UE of claim 1 , wherein the at least one PSFCH resource includes a resource in a first slot after a last slot for a reception of a PSSCH.
5. The first UE of claim 1 , wherein the first or second stage SCI format includes information indicating whether the PSSCH is: unicast, groupcast related to hybrid automatic repeat request acknowledgement (HARQ-ACK) information reporting of a first option, or groupcast related to a HARQ-ACK information reporting of a second option.
6. A second user equipment (UE) comprising:
a transceiver configured to:
transmit a first stage sidelink control information (SCI) format;
transmit a second stage SCI format including a zone identifier (ID);
transmit, to a first UE, a physical sidelink shared channel (PSSCH); and
receive, from the first UE, a physical sidelink feedback channel (PSFCH) using at least one PSFCH resource,
wherein the at least one PSFCH resource for the PSFCH reception is determined based on a modulo operation including an ID of the first UE and a number of the at least one PSFCH resource,
wherein a presence of the second stage SCI format including the zone ID is indicated by the first stage SCI format.
7. The second UE of claim 6 , wherein:
in a resource pool and within slots associated with the resource pool, the at least one PSFCH resource is configured periodically with a period of N number of slots, and
the at least one PSFCH resource in the resource pool is disabled in case that the N is zero.
8. The second UE of claim 7 , wherein, in case that the N is zero, a PSFCH reception from the first UE in the resource pool is disabled.
9. The second UE of claim 6 , wherein the at least one PSFCH resource includes a resource in a first slot after a last slot for a transmission of a PSSCH.
10. The second UE of claim 6 , wherein the first or second stage SCI format includes information indicating whether the PSSCH is: unicast, groupcast related to hybrid automatic repeat request acknowledgement (HARQ-ACK) information reporting of a first option, or groupcast related to a HARQ-ACK information reporting of a second option.
11. The second UE of claim 6 , further comprising:
a processor operably coupled to the transceiver, the processor configured to:
determine whether a total transmission power of the second UE exceeds a configured maximum transmission power of the second UE, wherein the total transmission power includes an uplink transmission power of an uplink transmission for a base station and a sidelink transmission power of a sidelink transmission for the first UE; and
if the total transmission power of the second UE exceeds the configured maximum transmission power of the second UE, determine to reduce the uplink transmission power or the sidelink transmission power so that the total transmission power does not exceed the configured maximum transmission power based on a priority of the sidelink transmission;
wherein the transceiver is further configured to perform the uplink transmission and the sidelink transmission simultaneously based on the uplink transmission power and the sidelink transmission power.
12. A method for operating a second user equipment (UE) in a wireless communication system, the method comprising:
transmitting a first stage sidelink control information (SCI) format;
transmitting a second stage SCI format including a zone identifier (ID);
transmitting, to a first UE, a physical sidelink shared channel (PSSCH); and
receiving, from the first UE, a physical sidelink feedback channel (PSFCH) using at least one PSFCH resource,
wherein the at least one PSFCH resource for the PSFCH reception is determined based on a modulo operation including an ID of the first UE and a number of the at least one PSFCH resource,
wherein a presence of the second stage SCI format including the zone ID is indicated by the first stage SCI format.
13. The method of claim 12 , wherein:
in a resource pool and within slots associated with the resource pool, the at least one PSFCH resource is configured periodically with a period of N number of slots, and
the at least one PSFCH resource in the resource pool is disabled in case that the N is zero.
14. The method of claim 13 , wherein, in case that the N is zero, a PSFCH reception from the first UE in the resource pool is disabled.
15. The method of claim 12 , wherein the at least one PSFCH resource includes a resource in a first slot after a last slot for a transmission of a PSSCH.
16. The method of claim 12 , wherein the first or second stage SCI format includes information indicating whether the PSSCH is: unicast, groupcast related to hybrid automatic repeat request acknowledgement (HARQ-ACK) information reporting of a first option, or groupcast related to a HARQ-ACK information reporting of a second option.
17. The method of claim 12 , further comprising:
determining whether a total transmission power of the second UE exceeds a configured maximum transmission power of the second UE, wherein the total transmission power includes an uplink transmission power of an uplink transmission for a base station and a sidelink transmission power of a sidelink transmission for the first UE;
if the total transmission power of the second UE exceeds the configured maximum transmission power of the second UE, reducing the uplink transmission power or the sidelink transmission power so that the total transmission power does not exceed the configured maximum transmission power based on a priority of the sidelink transmission; and
performing the uplink transmission and the sidelink transmission simultaneously based on the uplink transmission power and the sidelink transmission power.