Cellular network assisted device to device (d2d) discovery

In a wireless communications network including a base station and a plurality of device-to-device (D2D) capable user equipments (D2D-UEs), a method implemented in a D2D-UE in the plurality of D2D-UEs, the method comprising:

• receiving a D2D discovery system information block (D2D-SIB) indicating one or more frames or one or more subframes for the D2D-UEs to transmit or monitor a D2D discovery request signal and to transmit or monitor a D2D discovery response signal;
• and
• transmitting, to another D2D-UE in the plurality of D2D-UEs, the D2D discovery request signal in said one or more frames or said one or more subframes,
• wherein, upon receipt of the D2D discovery request signal, said another D2D-UE transmits, to the D2D-UE, the D2D discovery response signal in said one or more frames or said one or more subframes.

A method implemented in a wireless communications network including a base station and a plurality of device-to-device (D2D) capable user equipments (D2D-UEs), the method comprising:

• broadcasting, from the base station, a D2D discovery system information block (D2D-SIB) indicating one or more frames or one or more subframes for the D2D-UEs to transmit or monitor a D2D discovery request signal and to transmit or monitor a D2D discovery response signal;
• transmitting, from a first D2D-UE in the plurality of D2D-UEs to a second D2D-UE in the plurality of D2D-UEs, the D2D discovery request signal in said one or more frames or said one or more subframes;
• and
• upon receipt of the D2D discovery request signal, transmitting, from the second D2D-UE to the first D2D-UE, the D2D discovery response signal in said one or more frames or said one or more subframes.