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 method for a user equipment (UE) to provide hybrid automatic repeat request acknowledgement (HARQ-ACK) information, the method comprising:
receiving a configuration for a slot offset value;
receiving a physical sidelink shared channel (PSSCH) over a number of sub-channels in a first slot, wherein the PSSCH includes a transport block (TB);
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, wherein the PSFCH includes the HARQ-ACK information that is in response to reception of the TB; and
transmitting the PSFCH in the second slot,
wherein sub-channels and slots of PSSCH receptions are mapped to resources for corresponding PSFCH transmissions first in ascending order of a slot index, starting from a first sub-channel index, and then in ascending order of a sub-channel index, starting from a first slot index.
2. The method of claim 1 , further comprising:
receiving a configuration for a number of slots,
wherein the resources for the transmission of the PSFCH exist with a periodicity equal to the number of slots.
3. The method of claim 1 , further comprising:
determining a number of resources for the transmission of the PSFCH in the second slot; and
transmitting the PSFCH in the second slot based on determining that the number of resources is larger than or equal to a value.
4. The method of claim 1 , further comprising:
receiving a first sidelink control information (SCI) format that includes an indication of time resources and frequency resources for the reception of the PSSCH;
receiving a second SCI format that includes an identity of a zone;
determining an indication whether to transmit the PSFCH based on the identity of the zone; and
transmitting the PSFCH based on the indication.
5. A user equipment (UE) comprising:
a transceiver configured to:
receive a configuration for a slot offset value, and
receive a physical sidelink shared channel (PSSCH) over a number of sub-channels in a first slot, wherein the PSSCH includes a transport block (TB);
a processor operably connected to the transceiver, the processor configured to determine 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, wherein the PSFCH includes hybrid automatic repeat request acknowledgement (HARQ-ACK) information in response to reception of the TB; and
wherein the transceiver is further configured to transmit the PSFCH in the second slot, and
wherein sub-channels and slots of PSSCH receptions are mapped to resources for corresponding PSFCH transmissions first in ascending order of a slot index, starting from a first sub-channel index, and then in ascending order of a sub-channel index, starting from a first slot index.
6. The UE of claim 5 , wherein:
the transceiver is further configured to receive a configuration for a number of slots, and
the resources for the transmission of the PSFCH exist with a periodicity equal to the number of slots.
7. The UE of claim 5 , wherein:
the processor is further configured to determine a number of resources for the transmission of the PSFCH in the second slot; and
the transceiver is further configured to transmit the PSFCH in the second slot based on determining that the number of resources is larger than or equal to a value.
8. The UE of claim 5 , wherein:
the transceiver is further configured to:
receive a first sidelink control information (SCI) format that includes an indication of time resources and of frequency resources for the reception of the PSSCH, and
receive a second SCI format that includes an identity of a zone;
the processor is further configured to determine an indication whether to transmit the PSFCH based on the identity of the zone; and
the transceiver is further configured to transmit the PSFCH based on the indication.
9. A method for a user equipment (UE) to obtain hybrid automatic repeat request acknowledgement (HARQ-ACK) information, the method comprising:
transmitting a configuration for a slot offset value;
transmitting a physical sidelink shared channel (PSSCH) over a number of sub-channels in a first slot, wherein the PSSCH includes a transport block (TB);
determining a second slot as an earliest slot with resources for reception of a physical sidelink feedback channel (PSFCH) that is after the first slot by a number of slots equal to the slot offset value; and
receiving the PSFCH in the second slot, wherein the PSFCH includes the HARQ-ACK information that is in response to transmission of the TB, and
wherein sub-channels and slots for PSSCH transmissions are mapped to resources for corresponding PSFCH receptions first in ascending order of a slot index, starting from a first sub-channel index, and then in ascending order of a sub-channel index, starting from a first slot index.
10. The method of claim 9 , further comprising:
transmitting a configuration for a number of slots,
wherein the resources for the reception of the PSFCH exist with a periodicity equal to the number of slots.
11. The method of claim 9 , further comprising:
determining a number of resources for the reception of the PSFCH in the second slot for the reception of the PSFCH; and
receiving the PSFCH in the second slot based on determining that the number of resources is larger than or equal to a value.
12. The method of claim 9 , further comprising:
transmitting a first sidelink control information (SCI) format that includes an indication of time resources and frequency resources for the transmission of the PSSCH;
transmitting a second SCI format that includes an identity of a zone;
determining an indication whether to receive the PSFCH based on the identity of the zone; and
receiving the PSFCH based on the indication.
13. A user equipment (UE) comprising:
a transceiver configured to:
transmit a configuration for a slot offset value, and
transmit a physical sidelink shared channel (PSSCH) over a number of sub-channels in a first slot, wherein the PSSCH includes a transport block (TB);
a processor operably connected to the transceiver, the processor configured to determine a second slot as an earliest slot with resources for reception of a physical sidelink feedback channel (PSFCH) that is after the first slot by a number of slots equal to the slot offset value; and
wherein the transceiver is further configured to receive the PSFCH in the second slot, wherein the PSFCH includes hybrid automatic repeat request acknowledgement (HARQ-ACK) information in response to transmission of the TB, and
wherein sub-channels and slots for PSSCH transmissions are mapped to resources for corresponding PSFCH receptions first in ascending order of a slot index, starting from a first sub-channel index, and then in ascending order of a sub-channel index, starting from a first slot index.
14. The UE of claim 13 , wherein:
the transceiver is further configured to transmit a configuration for a number of slots, and
the resources for the reception of the PSFCH exist with a periodicity equal to the number of slots.
15. The UE of claim 13 , wherein:
the processor is further configured to determine a number of resources for the reception of the PSFCH in the second slot for the reception of the PSFCH; and
the transceiver is further configured to receive the PSFCH in the second slot based on determining that the number of resources is larger than or equal to a value.
16. The UE of claim 13 , wherein:
the transceiver is further configured to:
transmit a first sidelink control information (SCI) format that includes an indication of time resources and of frequency resources for the transmission of the PSSCH, and
transmit a second SCI format that includes an identity of a zone;
the processor is further configured to determine an indication whether to receive the PSFCH based on the identity of the zone; and
the transceiver is further configured to receive the PSFCH based on the indication.