Method and device for data transmission and resource selection by means of terminal measurement in wireless communication system

1. A method of transmitting a physical sidelink shared channel (PSSCH) by a device-to-device (D2D) user equipment (UE) in a wireless communication system, the method comprising:

receiving a physical sidelink control channel (PSCCH) and the PSSCH which is transmitted in a resource area indicated by the PSCCH;

selecting a transmission resource after excluding the resource area in which the PSSCH has been transmitted, based on a measurement value of energy of the PSSCH being larger than a predetermined threshold; and

transmitting a D2D signal based on the selected transmission resource,

wherein the threshold has a different value based on at least one of the PSSCH being a retransmission or a redundancy version (RV) of the PSSCH, or whether the PSCCH and the PSSCH are received in a same subframe, and

wherein a threshold related to the PSSCH of an initial transmission is smaller than a threshold related to the PSSCH of a retransmission.

2. The method according to claim 1 , wherein a threshold related to an RV of 0 is smaller a threshold related to an RV of 1.

3. The method according to claim 1 , wherein based on a congestion level being higher than a predetermined level, a threshold having a different value, based on the PSSCH being a retransmission or the RV of the PSSCH, is applied.

4. The method according to claim 1 , wherein the PSCCH and the PSSCH are received simultaneously.

5. The method according to claim 1 , wherein the PSCCH and the PSSCH are multiplexed in frequency division multiplexing (FDM).

6. The method according to claim 1 , wherein the measurement value of energy of the PSSCH corresponds to a reception power value of a demodulation reference signal (DMRS) of the PSSCH.

7. The method according to claim 1 , wherein the measurement value of energy of the PSSCH is an energy measurement value of resources except for a resource in which the PSCCH is transmitted.

8. The method according to claim 1 , wherein the measurement value of energy of the PSSCH is a weighted average of an energy measurement result of the PSCCH and the measurement value of energy of the PSSCH.

9. The method according to claim 8 , wherein the PSCCH and the PSSCH are contiguous along a frequency axis.

10. The method according to claim 8 , wherein based on the PSCCH and the PSSCH being non-contiguous along the frequency axis, a weighting factor for the energy measurement result of the PSCCH is 0.

11. The method according to claim 1 , wherein the PSCCH and the PSSCH are multiplexed in time division multiplexing (TDM).

12. The method according to claim 4 , wherein the PSCCH and the PSSCH have different thresholds.

13. A device-to-device (D2D) user equipment (UE) for transmitting a physical sidelink shared channel (PSSCH) in a wireless communication system, the D2D UE comprising:

a transmitter and a receiver; and

a processor, wherein the processor is configured to:

receive a physical sidelink control channel (PSCCH) and the PSSCH transmitted in a resource area indicated by the PSCCH through the receiver;

select, based on a measurement value of energy of the PSSCH being larger than a predetermined threshold, a transmission resource after excluding the resource area in which the PSSCH has been transmitted; and

transmit a D2D signal based on the selected transmission resource through the transmitter,

wherein the threshold has a different value based on at least one of the PSSCH being a retransmission or a redundancy version (RV) of the PSSCH, or whether the PSCCH and the PSSCH are received in a same subframe, and

wherein a threshold related to the PSSCH of an initial transmission is smaller than a threshold related to the PSSCH of a retransmission.

14. The method according to claim 1 , wherein a threshold related to the PSCCH and the PSSCH being received in the same subframe is different from a threshold related to the PSCCH and the PSSCH being received in different subframes.