Patent ID: 9521641
Filing Date: 2016-12-13
CPC Classification: H04W

Claim Text:
1. A user terminal located inside the coverage area of a first cell, the first cell operating at a first frequency in a mobile communication system that supports a D2D (Device to Device) proximity service, the user terminal comprising: a processor configured to transmit a D2D interest indication to a base station operating in the first cell, the D2D interest indication indicating that the user terminal has an interest in the D2D proximity service, wherein the transmission of the D2D interest indication enables the base station to determine one of the first cell and the second cell where the user terminal will operate to obtain the D2D proximity service, wherein the D2D proximity service includes a D2D discovery signal step for discovering other user terminals located in one of the first cell operating at the first frequency and a second cell operating at a second frequency; and transmit a D2D discovery signal of the D2D discovery signal step to another user terminal in one of the first cell or the second cell where the D2D resources are available.