Methods and apparatus for transmitting and/or controlling device-to-device discovery signals

An apparatus for a wireless device, the apparatus comprising:

• at least one processor;
• and at least one memory including computer program code;
• the at least one memory and the computer program code being configured to, with the at least one processor, cause the wireless device at least to:
• transmit a device-to-device discovery signal using the same transmission resource that is used by a second wireless device for transmitting uplink retransmissions to a base station, the device-to-device discovery signal being transmitted at a power that is determined in accordance with a control signal received by the wireless device from the base station and at a frequency determined as a function of the distance of the wireless device from the base station.

An apparatus for a base station, the apparatus comprising:

• at least one processor;
• and at least one memory including computer program code;
• the at least one memory and the computer program code being configured to, with the at least one processor, cause the base station at least to:
• signal to a wireless device, which is served by the base station, a control signal that determines the transmission power used by the wireless device to transmit a device-to-device discovery signal using a Long Term Evolution Physical Uplink Shared Channel or a Long Term Evolution Physical Uplink Control Channel that is used by a second wireless device for transmitting uplink retransmissions to the base station.