Method for dropping communication based on priority by wireless device supporting WAN communication and V2X communication and, the wireless device performing the method

A wireless device configured to support both of wide area network (WAN) communication and V2X (vehicle-to-X) communication, wherein the device comprises:

• a transceiver configured to transmit data using the WAN communication and the V2X communication;
• and
• a processor operatively coupled to the transceiver,
• wherein the processor is configured to:
• schedule a first transmission to be performed in an N-th subframe,
• wherein the first transmission is performed based on the WAN communication, the N is an integer number equal to or greater than one;
• schedule a second transmission to be performed in an (N−1)-th subframe,
• wherein the second transmission is performed based on the V2X communication, and
• wherein the (N−1)-th subframe for the second transmission overlaps with the N-th subframe for the first transmission,
• wherein an end point of the (N−1)-th subframe for the second transmission is located after a start point of the N-th subframe for the first transmission by a DFN (Direct Frame Number) offset;
• and
• determine which one of the first transmission or the second transmission to be dropped, based on a priority between the WAN communication and V2X communication and (ii) a comparison between a length of a last symbol in the (N−1)-th subframe for the second transmission and a length of the DFN offset,
• wherein the second transmission is not dropped in the (N−1)-th subframe when the WAN communication has a higher priority than the V2X communication, and the length of the DFN offset is smaller than or equal to the length of the last symbol in the (N−1)-th subframe for the second transmission, and
• wherein the last symbol in the (N−1)-th subframe for the second transmission is a punctured symbol, which is not used for data transmission.