Method and apparatus for configuration of resource sensing in NR V2X resource allocation
A method for a user equipment (UE) to provide hybrid automatic repeat request acknowledgement (HARQ-ACK) information includes transmitting physical sidelink shared channels (PSSCHs), where each of the PSSCH transmissions provides a transport block (TB); receiving physical sidelink feedback channels (PSFCHs); and generating values for HARQ-ACK information bits from the PSFCH receptions. The PSFCH receptions correspond to the PSSCH transmissions and the values of the HARQ-ACK information bits correspond to the TBs in the PSSCH transmissions. The method further includes generating a HARQ-ACK codeword that includes the values of the HARQ-ACK information bits arranged in a predetermined order and transmitting the HARQ-ACK codeword in a physical uplink control channel (PUCCH).
1. A method for a user equipment (UE) to transmit first physical sidelink shared channels (PSSCHs), the method comprising:
receiving a first physical downlink control channel (PDCCH) in a first slot according to a first radio access technology (RAT), wherein the first PDCCH provides a first downlink control information (DCI) format activating transmissions of first PSSCHs;
determining a first subframe after the first slot based on a time offset indicated by a value of a timing offset field in the first DCI format, wherein the time offset is in milliseconds; and
transmitting a first of the first PSSCHs in the first subframe according to a second RAT that is different from the first RAT.
2. The method of claim 1 , further comprising:
receiving information for a set of time offsets, wherein values of the timing offset field map to time offsets from the set of time offsets.
3. The method of claim 1 , further comprising:
transmitting information for a minimum time offset, wherein the time offset is larger than or equal to the minimum time offset.
4. The method of claim 1 , further comprising:
determining a second subframe after the first subframe; and
transmitting a second PSSCH from the first PSSCHs in the second subframe, wherein:
the second subframe is determined based on a time period between successive transmissions of the first PSSCHs when the second PSSCH provides a different transport block than the first PSSCH, and
the second subframe is determined based on a time gap indicated by a value of a time gap field in the first DCI format when the second PSSCH provides a same transport block as the first PSSCH.
5. The method of claim 1 , further comprising:
determining frequency domain resources for the first PSSCH transmissions based on a frequency resource field in the first DCI format; and
transmitting the first PSSCHs in the frequency domain resources.
6. The method of claim 1 , wherein the first RAT is a new radio (NR) RAT and the second RAT is a long term evolution (LTE) RAT.
7. The method of claim 1 , further comprising:
receiving a second PDCCH according to the first RAT in a second slot, wherein the second PDCCH provides a second DCI format activating transmissions of second PSSCHs;
determining a third slot after the second slot based on a time gap indicated by a value of a time gap field in the second DCI format, wherein the value of the time gap field is a number of slots; and
transmitting a first of the second PSSCHs in the third slot according to the first RAT.
8. The method of claim 7 , wherein slots for successive transmissions of the second PSSCHs are separated by the time gap.
9. The method of claim 7 , wherein the first of the second PSSCHs includes a medium access control (MAC) control element providing a rank indicator (RI) or a channel quality indicator (CQI).
10. The method of claim 7 , further comprising:
determining a resource for a physical uplink control channel (PUCCH) providing acknowledgement information associated with transport blocks provided by PSSCHs from the second PSSCHs based on a resource indicator field in the second DCI format; and
transmitting the PUCCH using the resource.
11. A user equipment (UE) comprising:
a transceiver configured to receive a first physical downlink control channel (PDCCH) in a first slot according to a first radio access technology (RAT), wherein the first PDCCH provides a first downlink control information (DCI) format activating transmissions of first physical sidelink shared channels (PSSCHs); and
a processor operably coupled to the transceiver, the processor configured to determine a first subframe after the first slot based on a time offset indicated by a value of a timing offset field in the first DCI format, wherein the time offset is in milliseconds,
wherein the transceiver is further configured to transmit a first of the first PSSCHs in the first subframe according to a second RAT that is different from the first RAT.
12. The UE of claim 11 , wherein:
the transceiver is further configured to receive information for a set of time offsets, and
values of the timing offset field map to time offsets from the set of time offsets.
13. The UE of claim 11 , wherein:
the transceiver is further configured to transmit information for a minimum time offset, and
the time offset is larger than or equal to the minimum time offset.
14. The UE of claim 11 , wherein:
the processor is further configured to determine a second subframe after the first subframe,
the transceiver is further configured to transmit a second PSSCH from the first PSSCHs in the second subframe,
the second subframe is determined based on a time period between successive transmissions of the first PSSCHs when the second PSSCH provides a different transport block than the first PSSCH, and
the second subframe is determined based on a time gap indicated by a value of a time gap field in the first DCI format when the second PSSCH provides a same transport block as the first PSSCH.
15. The UE of claim 11 , wherein:
the processor is further configured to determine frequency domain resources for the first PSSCH transmissions based on a frequency resource field in the first DCI format; and
the transceiver is further configured to transmit the first PSSCHs in the frequency domain resources.
16. The UE of claim 11 , wherein the first RAT is a new radio (NR) RAT and the second RAT is a long term evolution (LTE) RAT.
17. The UE of claim 11 , wherein:
the transceiver is further configured to receive a second PDCCH according to the first RAT in a second slot,
the second PDCCH provides a second DCI format activating transmissions of second PSSCHs,
the processor is further configured to determine a third slot after the second slot based on a time gap indicated by a value of a time gap field in the second DCI format,
the value of the time gap field is a number of slots, and
the transceiver is further configured to transmit a first of the second PSSCHs in the third slot according to the first RAT.
18. The UE of claim 17 , wherein slots for successive transmissions of the second PSSCHs are separated by the time gap.
19. The UE of claim 17 , wherein the first of the second PSSCHs includes a medium access control (MAC) control element providing a rank indicator (RI) or a channel quality indicator (CQI).
20. The UE of claim 17 , wherein:
the processor is further configured to determine a resource for a physical uplink control channel (PUCCH) providing acknowledgement information associated with transport blocks provided by PSSCHs from the second PSSCHs based on a resource indicator field in the second DCI format; and
the transceiver is further configured to transmit the PUCCH using the resource.