A method performed by a wireless user device, comprising: receiving, 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, wherein a bitwidth of the first indicator field is based on at least one of the one or more parameters; based on the SL DCI, transmitting, to a second wireless user device via a physical sidelink shared channel, PSSCH, a first sidelink signal; during a first time interval, receiving, from the second wireless user device via a physical sidelink feedback channel, PSFCH, first sidelink HARQ feedback information responsive to the first sidelink signal; determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval to transmit the first sidelink HARQ feedback information; 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 second sidelink signal; during a third time interval, receiving second sidelink HARQ feedback information responsive to the second sidelink signal; 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; and during the second time interval, transmitting, to the base station, the first sidelink HARQ feedback information and the second sidelink HARQ feedback information, wherein the first sidelink HARQ feedback information and the second sidelink HARQ feedback information are multiplexed. receiving, 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, wherein a bitwidth of the first indicator field is based on at least one of the one or more parameters; based on the SL DCI, transmitting, to a second wireless user device via a physical sidelink shared channel, PSSCH, a first sidelink signal; during a first time interval, receiving, from the second wireless user device via a physical sidelink feedback channel, PSFCH, first sidelink HARQ feedback information responsive to the first sidelink signal; determining, based on the sidelink HARQ feedback timing and based on the first time interval, a second time interval to transmit the first sidelink HARQ feedback information; 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 second sidelink signal; 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 second sidelink signal; during a third time interval, receiving second sidelink HARQ feedback information responsive to the second sidelink signal; 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; and during the second time interval, transmitting, to the base station, the first sidelink HARQ feedback information and the second sidelink HARQ feedback information, wherein the first sidelink HARQ feedback information and the second sidelink HARQ feedback information are multiplexed. <EOS>