Feedback resource

A destination wireless device comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the destination wireless device to:
• receive, from a base station, configuration parameters of physical sidelink feedback channel (PSFCH) radio resources;
• receive, from a source wireless device, sidelink control information comprising an identity (ID) of the source wireless device;
• determine an index of a PSFCH radio resource, among the PSFCH radio resources, based on:
• the ID of the source wireless device;
• an ID of the destination wireless device;
• and
• a modulo operation performed on a quantity of the PSFCH radio resources;
• and
• transmit, to the source wireless device, an acknowledgement for a transport block via the PSFCH radio resource having the index.

A system, comprising:

• a base station comprising:
• one or more processors and memory storing instructions that, when executed by the one or more processors, cause the base station to transmit configuration parameters of physical sidelink feedback channel (PSFCH) radio resources;
• a destination wireless device comprising:
• one or more first processors and first memory storing first instructions that, when executed by the one or more first processors, cause the destination wireless device to:
• receive, from the base station, the configuration parameters of the PSFCH radio resources;
• receive, from a source wireless device, sidelink control information comprising an identity (ID) of the source wireless device;
• determine an index of a PSFCH radio resource, among the PSFCH radio resources, based on:
• the ID of the source wireless device;
• an ID of the destination wireless device;
• and
• a modulo operation performed on a quantity of the PSFCH radio resources;
• and
• transmit, to the source wireless device, an acknowledgement for a transport block via the PSFCH radio resource having the index;
• and
• the source wireless device, wherein the source wireless device comprises:
• one or more second processors and second memory storing second instructions that, when executed by the one or more second processors, cause the source wireless device to:
• receive, from the base station, the configuration parameters of the PSFCH radio resources;
• transmit the sidelink control information comprising the ID of the source wireless device;
• and
• receive the acknowledgement via the PSFCH radio resource.