Method and device for transmitting and receiving signal for device-to-device communication in wireless communication system

A first user equipment (UE) for transmitting and receiving a signal for device-to-device (D2D) communication in a communication system, the first UE comprising:

• a transmit module;
• a receive module comprising a first receiver module for a primary serving cell of the first UE and a second receiver module for a secondary serving cell of the first UE;
• and
• a processor that controls the transmit module and the receive module to:
• transmit a request for a measurement period and a request for carrier aggregation reconfiguration,
• switch a frequency band of the second receiver module to a frequency band of a serving cell of a second UE while maintaining a frequency band of the first receiver module during the measurement period,
• acquire downlink synchronization of the serving cell of the second UE through the frequency band of the serving cell of the second UE, using the second receiver,
• transmit a random access preamble,
• receive a random access response containing timing advance in response to transmission of the random access preamble through the frequency band of the serving cell of the second UE, using the second receiver, and
• receive a beacon signal transmitted by the second UE on the basis of the timing advance through the frequency band of the serving cell of the second UE, using the second receiver,
• wherein the request for the carrier aggregation reconfiguration includes a request for deactivation of the secondary cell during the measurement period.