Method for transmitting synchronization signal and synchronization channel in wireless communication system supporting device-to-device communication and apparatus for the same

1. A method for transmitting a sidelink synchronization signal and a Physical Sidelink Broadcast Channel (PSBCH) in a wireless communication system supporting Device-to-Device (D2D) communication, comprising:

mapping the sidelink synchronization signal and the PSBCH to a physical resource; and

transmitting the mapped sidelink synchronization signal and the PSBCH to a UE (user equipment),

wherein the sidelink synchronization signal is mapped to 62 subcarriers in the frequency domain, and the PSBCH is mapped to same resource blocks as the sidelink synchronization signal.

2. The method of claim 1 , wherein one resource block comprises 12 subcarriers in the frequency domain, and the sidelink synchronization signal is mapped to 62 subcarriers located in the center of 6 resource blocks.

3. The method of claim 2 , wherein the PSBCH is mapped to the six resource blocks in the frequency domain.

4. The method of claim 2 , wherein the PSBCH is mapped in units of resource blocks in the frequency domain.

5. The method of claim 2 , wherein the PSBCH is mapped to the 62 subcarriers in the same way with the sidelink synchronization signal in the frequency domain.

6. The method of claim 2 , wherein, in a symbol to which the sidelink synchronization signal is mapped, 5 subcarriers at both ends of the symbol to which the sidelink synchronization signal is not mapped are padded with zeros.

7. The method of claim 1 , wherein the sidelink synchronization signal comprises a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS); and the PSSS is mapped to the symbol preceding the SSSS in the time domain.

8. The method of claim 7 , wherein mapping is performed in the order of the PSSS, the PSBCH, and the SSSS in the time domain.

9. The method of claim 1 , wherein the PSBCH transmits at least one of identifier of a device transmitting the sidelink synchronization signal, type of a device transmitting the sidelink synchronization signal, and resource allocation information for data channel, control channel, and discovery channel.

10. The method of claim 1 , wherein the PSBCH transmits an indicator indicating whether a UE receiving the PSBCH uses transmission resources from a pre-configured resource pool, whether a UE receiving the PSBCH uses resources indicated by the PSBCH, or whether a UE receiving the PSBCH uses a predetermined resource unit.

11. The method of claim 1 , wherein the PSBCH delivers information about resources to which a scheduling assignment about a data channel, control channel, and discovery channel is transmitted.

12. The method of claim 1 , wherein the PSBCH delivers information about resources used for transmitting a scheduling assignment for requesting resources for a data channel, control channel, and discovery channel.

13. In a wireless communication system supporting D2D communication, a UE (user equipment) for transmitting a sidelink synchronization signal and a Physical Sidelink Broadcast Channel (PSBCH), comprising:

a Radio Frequency (RF) unit for transmitting and receiving a radio signal; and

a processor, wherein the processor is configured

to map the sidelink synchronization signal and the PSBCH to a physical resource; and

to transmit the mapped sidelink synchronization signal and the PSBCH to a UE, wherein the sidelink synchronization signal is mapped to 62 subcarriers in the frequency domain, and the PSBCH is mapped to same resource blocks as the sidelink synchronization signal.