Patent ID: 9743249
Date: 2017-08-22
CPC Classifications: G01S,H04W

Claim:
1. A user equipment (UE) for a mobile communication system, the mobile communication system comprising the UE, a device to device (D2D) UE, a base station (BS) and a backhaul device and defining an uplink resource and a downlink resource, the uplink resource being used by the UE and the D2D UE for an uplink signal transmission, the downlink resource being used by the BS for a downlink signal transmission, the D2D UE being capable of D2D transmission through the uplink resource, the UE being incapable of the D2D transmission through the uplink resource, the D2D UE being near to the UE, and the BS connecting to the backhaul device, the UE comprising: a transceiver connecting to the BS, being configured to receive a signal transmitting request message from the BS, the signal transmitting request message indicating an uplink resource region of the uplink resource; and a processor electrically connected to the transceiver, being configured to generate an uplink reference signal according to the signal transmitting request message and enable the transceiver to transmit the uplink reference signal in the uplink resource region; wherein the D2D UE receives the uplink reference signal from the uplink resource region, measures the uplink reference signal to generate a D2D uplink measurement report message, and transmits the D2D uplink measurement report message to the backhaul device so that the backhaul device decides location information of at least one of the UE and the D2D UE according to the D2D uplink measurement report message.