Method for processing plurality of signals in communication system supporting direct communication between terminals and apparatus therefor
The present document relates to a method for processing a signal when a plurality of signals are to be received or transmitted in a specific time interval (e.g., a sub-frame) in a wireless communication system supporting direct communication between terminals, i.e., D2D communication, and an apparatus therefor. To this end, when a terminal is to receive a plurality of signals including a discovery signal, a D2D synchronization signal, a resource allocation signal, and a D2D communication signal at a specific time point, the corresponding terminal may preferentially select and process a specific signal from among the plurality of signals.
1. A method of transmitting and receiving a signal in a wireless communication system supporting D2D (device-to-device) communication, the method performed by a user equipment (UE) and comprising:
receiving an RRC (radio resource control) signal related to the D2D communication from an eNB;
transceiving a discovery signal with at least one other UE;
transceiving a D2D synchronization signal for the D2D communication with the at least one other UE;
transceiving a resource allocation signal with the at least one other UE; and
transceiving a D2D communication signal with the at least one other UE based on the transceived resource allocation signal,
wherein transmission of the D2D synchronization signal is prioritized over transmission of the discovery signal when the D2D synchronization signal and the discovery signal are scheduled for transmission in a same time unit such that the discovery signal is not transmitted in the same time unit, and
wherein a first discovery signal from a UE of a smaller TA (timing advanced) is prioritized over a second discovery signal from a UE of a larger TA when the discovery signal from the UE of the smaller TA and the discovery signal from the UE of the larger TA are received in the same time unit.
2. The method of claim 1 , wherein a signal using an extended CP (cyclic prefix) is prioritized over a signal using a normal CP when the signal using the normal CP and the signal using the extended CP are received in the same time unit.
3. A user equipment (UE) transmitting and receiving a signal in a wireless communication system supporting D2D (device-to-device) communication, the UE comprising:
a transceiver configured to receive and transmit signals; and
a processor connected with the transceiver and configured to control the transceiver to:
receive an RRC (radio resource control) signal related to the D2D communication from an eNB;
transceive a discovery signal with at least one other UE;
transceive a D2D synchronization signal for the D2D communication with the at least one other UE;
transceive a resource allocation signal with the at least one other UE; and
transceive a D2D communication signal with the at least one other UE based on the transceived resource allocation signal,
wherein transmission of the D2D synchronization signal is prioritized over transmission of the discovery signal when the D2D synchronization signal and the discovery signal are scheduled for transmission in a same time unit such that the discovery signal is not transmitted in the same time unit, and
wherein a first discovery signal from a UE of a smaller TA (timing advanced) is prioritized over a second discovery signal from a UE of a larger TA when the discovery signal from the UE of the smaller TA and the discovery signal from the UE of the larger TA are received in the same time unit.
4. The UE of claim 3 , wherein a signal using an extended CP (cyclic prefix) is prioritized over a signal using a normal CP when the signal using the normal CP and the signal using the extended CP are received in the same time unit.