Method and apparatus for using HARQ in wireless communications

1. A method comprising:

receiving, by a wireless user device from a base station, one or more radio resource control (RRC) signals indicating one or more parameters associated with sidelink communication between wireless user devices;

receiving, from the base station, sidelink downlink control information (SL DCI) comprising a first indicator field that indicates a sidelink hybrid automatic repeat request (HARQ) feedback timing;

based on the SL DCI, transmitting, to one or more second wireless user devices, a plurality of sidelink signals via a first quantity of sidelink channel resources;

during a first time interval, receiving, from the one or more second wireless user devices, first sidelink HARQ feedback information responsive to the plurality of sidelink signals;

determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval;

receiving, from the base station, second SL DCI comprising a second indicator field that indicates a second sidelink HARQ feedback timing;

based on the second SL DCI, transmitting a plurality of second sidelink signals via a second quantity of second sidelink channel resources;

during a third time interval, receiving second sidelink HARQ feedback information responsive to the plurality of second sidelink signals;

determining, based on the second sidelink HARQ feedback timing and based on the third time interval, the second time interval to transmit the second sidelink HARQ feedback information;

determining, based on the first quantity and the second quantity, a sidelink HARQ codebook; and

during the second time interval and based on the sidelink HARQ codebook, transmitting, to the base station, an uplink signal indicating:

the first sidelink HARQ feedback information; and

the second sidelink HARQ feedback information.

2. The method of claim 1 , wherein the first sidelink HARQ feedback information and the second sidelink HARQ feedback information are multiplexed in the uplink signal.

3. The method of claim 1 , wherein a value of the first indicator field corresponds to a slot timing value between the first time interval and the second time interval, and wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) occasion and the second time interval corresponds to a physical uplink control channel (PUCCH) slot.

4. The method of claim 1 , wherein the one or more parameters indicates information of a set of slot timing values, K SL , wherein each slot timing value indicates a timing between a physical sidelink feedback channel (PSFCH) occasion and a physical uplink control channel (PUCCH) slot, and wherein the PUCCH slot comprises the second time interval.

5. The method of claim 4 , wherein the determining the sidelink HARQ codebook comprises determining, based on the set of slot timing values, K SL , the sidelink HARQ codebook.

6. The method of claim 1 , wherein the determining the sidelink HARQ codebook comprises determining, based on a ratio between a sidelink subcarrier spacing (SCS) configuration and an uplink SCS configuration, the sidelink HARQ codebook.

7. The method of claim 1 , wherein the determining the sidelink HARQ codebook comprises determining, based on a period of a physical sidelink feedback channel (PSFCH) time resource, the sidelink HARQ codebook.

8. The method of claim 1 , further comprising:

based on a descending order of slot timing values indicated by the one or more parameters, sorting sidelink HARQ feedback information bits; and

generating, based on the sorting, the uplink signal.

9. The method of claim 1 , wherein:

the first time interval corresponds to a physical sidelink feedback channel (PSFCH) reception slot; and

the second time interval corresponds to an uplink slot or a slot comprising one or more uplink symbols.

10. The method of claim 1 , wherein the determining the sidelink HARQ codebook comprises determining, based on a quantity of physical sidelink feedback channel (PSFCH) occasions associated with the uplink signal, the sidelink HARQ codebook.

11. The method of claim 1 , wherein the plurality of sidelink signals comprise a first sidelink signal transmitted to a wireless user device for which a sidelink HARQ feedback is disabled, and

wherein the method further comprises: based on the sidelink HARQ feedback being disabled for the wireless user device and based on a retransmission of a sidelink channel being not required, determining a positive acknowledgment for the first sidelink signal.

12. The method of claim 1 , further comprising:

determining a positive acknowledgement associated with a scheduled sidelink channel resource of the first quantity of sidelink channel resources,

wherein the wireless user device does not transmit a sideilnk signal via the scheduled sidelink channel resource.

13. A method comprising:

receiving, by a wireless user device from a base station, sidelink downlink control information (SL DCI) associated with transmission of one or more sidelink signals;

based on the SL DCI, transmitting, to one or more second wireless user devices, the one or more sidelink signals via a first quantity of sidelink channel resources;

during a first time interval, receiving, from the one or more second wireless user devices, first sidelink HARQ feedback information responsive to the one or more sidelink signals;

determining, based on a sidelink HARQ feedback timing and based on the first time interval, a second time interval;

receiving, from the base station, second SL DCI associated with transmission of one or more second sidelink signals, wherein the second SL DCI comprises an indicator field that indicates a second sidelink HARQ feedback timing;

based on the second SL DCI, transmitting one or more second sidelink signals via a second quantity of second sidelink channel resources;

during a third time interval, receiving second sidelink HARQ feedback information responsive to the one or more second sidelink signals; and

determining, based on the second sidelink HARQ feedback timing and based on the third time interval, the second time interval to transmit the second sidelink HARQ feedback information;

determining, based on the first quantity and the second quantity, a sidelink HARQ codebook; and

during the second time interval and based on the sidelink HARQ codebook, transmitting, to the base station, an uplink signal indicating:

the first sidelink HARQ feedback information; and

the second sidelink HARQ feedback information.

14. The method of claim 13 , further comprising receiving, from the base station, one or more radio resource control (RRC) signals indicating one or more parameters associated with sidelink communication between wireless user devices,

wherein the one or more parameters comprises information of a set of slot timing values, K SL , and

wherein the SL DCI comprises a first indicator field that comprises one of the set of slot timing values, K SL , to indicate the sidelink HARQ feedback timing.

15. The method of claim 13 , wherein the determining the sidelink HARQ codebook comprises determining, based on a quantity of physical sidelink feedback channel (PSFCH) occasions associated with the uplink signal, a size of the sidelink HARQ codebook.

16. The method of claim 13 , wherein the one or more sidelink signals comprise a first sidelink signal transmitted to a wireless user device for which a sidelink HARQ feedback is disabled, and

wherein the method further comprises: based on the sidelink HARQ feedback being disabled for the wireless user device and based on a retransmission of a sidelink channel being not required, determining a positive acknowledgment for the first sidelink signal.

17. The method of claim 13 , further comprising:

determining a positive acknowledgement associated with a scheduled sidelink channel resource of the first quantity of sidelink channel resources,

wherein the wireless user device does not transmit a sideilnk signal via the scheduled sidelink channel resource.

18. A method comprising:

receiving, by a wireless user device from a base station, one or more radio resource control (RRC) signals indicating one or more parameters associated with sidelink communication between wireless user devices;

receiving, from the base station, sidelink downlink control information (SL DCI) comprising a first indicator field that indicates a sidelink hybrid automatic repeat request (HARQ) feedback timing;

based on the SL DCI, transmitting, to one or more second wireless user devices, a plurality of sidelink signals via a first quantity of sidelink channel resources;

during a first time interval, receiving, from the one or more second wireless user devices, first sidelink HARQ feedback information responsive to the plurality of sidelink signals;

determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval;

determining, based on the first quantity, a sidelink HARQ codebook; and

during the second time interval and based on the sidelink HARQ codebook, transmitting, to the base station, an uplink signal indicating the first sidelink HARQ feedback information,

wherein the determining the sidelink HARQ codebook comprises determining, based on a ratio between a sidelink subcarrier spacing (SCS) configuration and an uplink SCS configuration, the sidelink HARQ codebook.

19. The method of claim 18 , wherein the first sidelink HARQ feedback information and second sidelink HARQ feedback information are multiplexed in the uplink signal.

20. The method of claim 18 , wherein a value of the first indicator field corresponds to a slot timing value between the first time interval and the second time interval, and wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) occasion and the second time interval corresponds to a physical uplink control channel (PUCCH) slot.

21. The method of claim 18 , wherein the one or more parameters indicates information of a set of slot timing values, K SL ,

wherein each slot timing value indicates a timing between a physical sidelink feedback channel (PSFCH) occasion and a physical uplink control channel (PUCCH) slot,

wherein the PUCCH slot comprises the second time interval, and

wherein the determining the sidelink HARQ codebook comprises determining, based on the set of slot timing values, K SL , the sidelink HARQ codebook.

22. The method of claim 18 , wherein the determining the sidelink HARQ codebook comprises determining, based on a period of a physical sidelink feedback channel (PSFCH) time resource, the sidelink HARQ codebook.

23. The method of claim 18 , further comprising:

based on a descending order of slot timing values indicated by the one or more parameters, sorting sidelink HARQ feedback information bits; and

generating, based on the sorting, the uplink signal.

24. The method of claim 18 , wherein:

the first time interval corresponds to a physical sidelink feedback channel (PSFCH) reception slot; and

the second time interval corresponds to an uplink slot or a slot comprising one or more uplink symbols.

25. The method of claim 18 , wherein the determining the sidelink HARQ codebook comprises determining, based on a quantity of physical sidelink feedback channel (PSFCH) occasions associated with the uplink signal, the sidelink HARQ codebook.

26. The method of claim 18 , wherein the plurality of sidelink signals comprise a first sidelink signal transmitted to a wireless user device for which a sidelink HARQ feedback is disabled, and

wherein the method further comprises: based on the sidelink HARQ feedback being disabled for the wireless user device and based on a retransmission of a sidelink channel being not required, determining a positive acknowledgment for the first sidelink signal.

27. The method of claim 18 , further comprising:

determining a positive acknowledgement associated with a scheduled sidelink channel resource of the first quantity of sidelink channel resources,

wherein the wireless user device does not transmit a sideilnk signal via the scheduled sidelink channel resource.

28. A method comprising:

receiving, by a wireless user device from a base station, one or more radio resource control (RRC) signals indicating one or more parameters associated with sidelink communication between wireless user devices;

receiving, from the base station, sidelink downlink control information (SL DCI) comprising a first indicator field that indicates a sidelink hybrid automatic repeat request (HARQ) feedback timing;

based on the SL DCI, transmitting, to one or more second wireless user devices, a plurality of sidelink signals via a first quantity of sidelink channel resources;

during a first time interval, receiving, from the one or more second wireless user devices, first sidelink HARQ feedback information responsive to the plurality of sidelink signals;

determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval;

determining, based on the first quantity, a sidelink HARQ codebook;

based on a descending order of slot timing values indicated by the one or more parameters, sorting sidelink HARQ feedback information bits;

generating, based on the sorting, an uplink signal; and

during the second time interval and based on the sidelink HARQ codebook, transmitting, to the base station, the uplink signal, wherein the uplink signal indicates the first sidelink HARQ feedback information.

29. The method of claim 28 , wherein the first sidelink HARQ feedback information and second sidelink HARQ feedback information are multiplexed in the uplink signal,

wherein a value of the first indicator field corresponds to a slot timing value between the first time interval and the second time interval,

wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) occasion and the second time interval corresponds to a physical uplink control channel (PUCCH) slot,

wherein the one or more parameters indicates information of a set of slot timing values, K SL ,

wherein each slot timing value indicates a timing between a physical sidelink feedback channel (PSFCH) occasion and a physical uplink control channel (PUCCH) slot,

wherein the PUCCH slot comprises the second time interval, and

wherein the determining the sidelink HARQ codebook comprises determining, based on the set of slot timing values, K SL , the sidelink HARQ codebook.

30. The method of claim 28 , wherein the determining the sidelink HARQ codebook comprises determining, based on a period of a physical sidelink feedback channel (PSFCH) time resource, the sidelink HARQ codebook,

wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) reception slot, and

wherein the second time interval corresponds to an uplink slot or a slot comprising one or more uplink symbols.

31. The method of claim 28 , further comprising:

determining a positive acknowledgement associated with a scheduled sidelink channel resource of the first quantity of sidelink channel resources,

wherein the wireless user device does not transmit a sideilnk signal via the scheduled sidelink channel resource, and

wherein the determining the sidelink HARQ codebook comprises determining, based on a quantity of physical sidelink feedback channel (PSFCH) occasions associated with the uplink signal, the sidelink HARQ codebook.

32. The method of claim 28 , wherein the plurality of sidelink signals comprise a first sidelink signal transmitted to a wireless user device for which a sidelink HARQ feedback is disabled, and

wherein the method further comprises: based on the sidelink HARQ feedback being disabled for the wireless user device and based on a retransmission of a sidelink channel being not required, determining a positive acknowledgment for the first sidelink signal.

33. A method comprising:

receiving, by a wireless user device from a base station, one or more radio resource control (RRC) signals indicating one or more parameters associated with sidelink communication between wireless user devices;

receiving, from the base station, sidelink downlink control information (SL DCI) comprising a first indicator field that indicates a sidelink hybrid automatic repeat request (HARQ) feedback timing;

based on the SL DCI, transmitting, to one or more second wireless user devices, a plurality of sidelink signals via a first quantity of sidelink channel resources;

during a first time interval, receiving, from the one or more second wireless user devices, first sidelink HARQ feedback information responsive to the plurality of sidelink signals;

determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval;

determining, based on the first quantity, a sidelink HARQ codebook; and

during the second time interval and based on the sidelink HARQ codebook, transmitting, to the base station, an uplink signal indicating the first sidelink HARQ feedback information,

wherein the one or more parameters indicates information of a set of slot timing values, K SL , wherein each slot timing value indicates a timing between a physical sidelink feedback channel (PSFCH) occasion and a physical uplink control channel (PUCCH) slot, wherein the PUCCH slot comprises the second time interval, and wherein the determining the sidelink HARQ codebook comprises determining, based on the set of slot timing values, K SL , the sidelink HARQ codebook.

34. The method of claim 33 , wherein the first sidelink HARQ feedback information and second sidelink HARQ feedback information are multiplexed in the uplink signal,

wherein a value of the first indicator field corresponds to a slot timing value between the first time interval and the second time interval, and wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) occasion and the second time interval corresponds to a physical uplink control channel (PUCCH) slot,

wherein the first time interval corresponds to a physical sidelink feedback channel (PSFCH) reception slot,

wherein the second time interval corresponds to an uplink slot or a slot comprising one or more uplink symbols, and

wherein the determining the sidelink HARQ codebook comprises determining, based on a quantity of physical sidelink feedback channel (PSFCH) occasions associated with the uplink signal, the sidelink HARQ codebook.