Method and apparatus of handling time gap for sidelink hybrid automatic request (HARQ) in network scheduling mode in a wireless communication system

A method of a device to perform sidelink communication, comprising:

• the device receives a sidelink grant from a network node, wherein the sidelink grant schedules or assigns multiple sidelink resources, and the multiple sidelink resources comprise two or more sidelink resources;
• the device generates a data packet comprising or multiplexing sidelink data from one or more Sidelink (SL) logical channels, wherein the one or more SL logical channels is determined or selected at least based on time gap(s) of any two adjacent sidelink resources among the multiple sidelink resources and associated minimum time gap;
• and
• the device performs one or more sidelink transmissions on one or more of the multiple sidelink resources, wherein the one or more sidelink transmissions delivers or comprises the data packet.

A communication device, comprising:

• a control circuit;
• a processor installed in the control circuit;
• and
• a memory installed in the control circuit and operatively coupled to the processor;
• wherein the processor is configured to execute a program code stored in the memory to:
• receive a sidelink grant from a network node, wherein the sidelink grant schedules or assigns multiple sidelink resources;
• generate a data packet comprising or multiplexing sidelink data from Sidelink (SL) logical channel(s) with SL Hybrid Automatic Request (HARQ) feedback enabled;
• perform two sidelink transmissions for the data packet on two adjacent or consecutive sidelink resources among the multiple sidelink resources when a time gap of the two adjacent or consecutive sidelink resources is larger than or equal to a minimum time gap;
• and
• determine to drop, skip, or cancel a sidelink transmission on one sidelink resource of the two adjacent or consecutive sidelink resources among the multiple sidelink resources when the time gap of the two adjacent or consecutive sidelink resources is less than the minimum time gap.