USER DEVICE AND COLLISION DETECTION METHOD

摘要

A user device for transmitting/receiving a discovery signal is equipped with: a collision detection means for detecting a collision in a received discovery signal; a collision notification means for transmitting collision information expressing a collision has occurred in the received discovery signal, when the collision detection means detects a collision in the received discovery signal; a collision-information receiving means for receiving collision information; and a collision determination means for determining whether or not a collision has occurred in a transmitted discovery signal which was transmitted by the user device, on the basis of the collision information received by the collision-information receiving means.