Method for selecting of sidelink grant for a d2d ue in a d2d communication system and device therefor

A User Equipment (UE) transmitting sidelink data in a wireless communication system, the UE comprising:

• a transceiver;
• and
• a processor configured to:
• determine whether more sidelink data is available in a Sidelink Traffic Channel (STCH) than can be transmitted in a current Sidelink Control (SC) period,
• select a sidelink grant from a resource pool when more sidelink data is available in the STCH than can be transmitted in the current SC period, and
• control the transceiver to transmit sidelink data available in the STCH based on the selected sidelink grant,
• wherein the processor considers the selected sidelink grant to be a configured sidelink grant occurring in those time intervals starting at the beginning of an available SC period which starts at least N time intervals after a time interval in which the sidelink grant was selected, where N is a positive integer.

A device for performing sidelink communication in a wireless communication system, the device comprising:

• at least one processor;
• and
• at least one computer memory that is operably connectable to the at least one processor and that has stored thereon instructions which, when executed, cause the at least one processor to perform operations comprising:
• determining whether more sidelink data is available in a Sidelink Traffic Channel (STCH) than can be transmitted in a current Sidelink Control (SC) period,
• selecting a sidelink grant from a resource pool when more sidelink data is available in the STCH than can be transmitted in the current SC period, and
• transmitting sidelink data available in the STCH based on the selected sidelink grant,
• wherein the at least one processor considers the selected sidelink grant to be a configured sidelink grant occurring in those time intervals starting at the beginning of an available SC period which starts at least N time intervals after a time interval in which the sidelink grant was selected, where N is a positive integer.