Method and apparatus for using HARQ in wireless communications

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.

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.

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.

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, KSL, 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, KSL, the sidelink HARQ codebook.