Abstract: A method for performing location functions in a wireless communications using user equipment devices which communicate using a sidelink communication link is provided. Information may be transmitted from a transmit user equipment to a receive user equipment, and the information may be utilised to establish a locality of the transmit user equipment. If it is determined that the transmit user locality coincides with a communication area of the receive user equipment HARQ feedback may be enabled.

Abstract: There is provided a method of building a Hybrid automatic repeat request (HARQ) process set. The method comprises adding each new sequence of HARQ processes to a group of all the HARQ process sequences, and iterating the adding step Ji times for each possible number of Transport Blocks to be transmitted. Each HARQ process sequence may be correlated to a bit sequence which may transmitted in a DCI message to request re-transmission of certain TBs corresponding to the sequence numbers.