Method for detecting device-to-device signal, user equipment, and base station

A first user equipment, comprising:

• a receiver configured to receive:
• a first message sent by a second user equipment, wherein the first message comprises a timing advance for sending a device-to-device (D2D) signal by the second user equipment, and
• a reference signal sent from a first base station that serves the first user equipment;
• and
• at least one processor configured to:
• determine a reference time according to the reference signal,
• determine, according to the timing advance and the reference time, a first time for detecting the D2D signal, and
• detect the D2D signal at the first time.

A non-transitory, computer-readable storage medium storing one or more computer executable instructions that, when executed by one or more processors, cause the one or more processors to:

• receive a first message from a user equipment, wherein the first message comprises a timing advance for sending a device-to-device (D2D) signal by the user equipment;
• receive a reference signal from a first base station, wherein the first base station serves the first user equipment, and wherein the reference signal is a signal for determining a reference time;
• determine the reference time according to the reference signal;
• determine, according to the timing advance and the reference time, a first time for detecting the D2D signal;
• and
• detect the D2D signal at the first time.