MOBILE COMMUNICATION SYSTEM, USER TERMINAL AND PROCESSOR

摘要

In a mobile communication system according to the present embodiment, a discovery resource pool in which a discovery resource for a D2D discovery procedure for discovering a proximal terminal is arranged is provided in a frequency band for uplink cellular communication. The discovery resource pool includes a first discovery resource pool in which a first discovery resource not uniquely assigned to a user terminal is arranged and a second discovery resource pool in which a second discovery resource uniquely assigned to each user terminal is arranged. The first discovery resource pool and the second discovery resource pool are arranged alternately in a time direction in a time interval shorter than a retransmission interval of the uplink cellular communication.