Method and apparatus for handling sidelink feedback collision in a wireless communication system

A first user equipment (UE) configured to perform one or more sidelink transmissions on a plurality of carriers and configured with a first number of carriers corresponding to a maximum number of carriers that the first UE is able to at least one of use concurrently or transmit on concurrently, the first UE 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 perform operations, the operations comprising:
• receiving a first sidelink transmission on a first carrier of the plurality of carriers;
• deriving a first slot for transmitting a first Physical Sidelink Feedback Channel (PSFCH) based upon a first resource associated with the first sidelink transmission;
• receiving a second sidelink transmission on a second carrier of the plurality of carriers;
• deriving a second slot for transmitting a second PSFCH based upon a second resource associated with the second sidelink transmission, wherein at least a part of the first slot overlaps with at least a part of the second slot in a time domain;
• and
• responsive to determining that a number of carriers of a second plurality of carriers associated with derived transmissions of a plurality of PSFCHs exceeds the first number of carriers, prioritizing the first PSFCH or the second PSFCH based upon a rule, wherein:
• the plurality of PSFCHs comprises the first PSFCH and the second PSFCH;
• and
• a plurality of slots for transmitting the derived transmissions of the plurality of PSFCHs are at least partially overlapped in the time domain.