Method and apparatus for transmitting signal by sidelink terminal in wireless communication system

1. A method for transmitting a signal by a sidelink UE in a wireless communications system, the method comprising the steps of:

determining, a first transmission power used for a physical sidelink control channel (PSCCH) and a second transmission power per RE (Resource Element) of a physical sidelink shared channel (PSSCH);

transmitting the PSCCH by using a plurality of symbols in a slot; and

transmitting the PSSCH related to the PSCCH,

wherein the number of symbols used for the PSCCH transmission is changed based on a change in the number of symbols included in the slot, and

wherein based on that the PSCCH is FDMed (Frequency-division multiplexed) with the PSSCH in at least a portion of the slot, the first transmission power is excluded from a total available transmission power and then the second transmission power per RE is determined.

2. The method of claim 1 , wherein a relationship between the number of symbols included in the slot and the number of symbols used for the PSCCH transmission is preconfigured, delivered through physical layer signaling or delivered through higher layer signaling.

3. The method of claim 1 , wherein a payload size of the PSCCH or a size of a resource block (RB) to which the PSCCH is transmitted is changed based on the change in the number of symbols included in the slot.

4. The method of claim 1 , wherein the determined transmission power is also used for a transmission power per RE of PSSCH which is not subjected to FDM with the PSCCH in at least a portion of the slot.

5. The method of claim 1 , wherein MPR (Maximum Power Reduction) applied when the PSCCH is subjected to FDM with the PSSCH in at least a portion of the slot is applied even in the case that the PSCCH is not subjected to FDM with the PSSCH.

6. The method of claim 1 , wherein the PSCCH is repeatedly transmitted through at least one symbol in the slot.

7. The method of claim 6 , wherein the repeated transmission of the PSCCH is performed when the symbols used for the PSCCH transmission are smaller than those used for the PSSCH transmission related to the PSCCH.

8. The method of claim 6 , wherein the repeatedly transmitted PSCCH has a redundancy version (RV) of a preconfigured pattern.

9. The method of claim 8 , wherein the repeated transmission of the PSCCH or the preconfigured pattern is indicated by a demodulation reference signal (DMRS) for the PSCCH.

10. The method of claim 9 , wherein the repeated transmission of the PSCCH or the preconfigured pattern is indicated by DMRS base sequence set to a predetermined value or initialization ID.

11. The method of claim 6 , wherein the number of times for the repeated transmission is determined by a UE that transmits the PSCCH, by considering one or more of packet priority and packet arrival coverage.

12. A sidelink UE for transmitting or receiving a signal in a wireless communication system, the sidelink UE comprising:

a memory; and

a processor coupled to the memory,

wherein the processor:

determines a first transmission power used for a physical sidelink control channel (PSCCH) and a second transmission power per RE (Resource Element) of a physical sidelink shared channel (PSSCH),

transmits the PSCCH by using a plurality of symbols in a slot, and

transmits the PSSCH related to the PSCCH, and

wherein the number of symbols used for the PSCCH transmission is changed based on a change in the number of symbols included in the slot, and

wherein based on that the PSCCH is FDMed (Frequency-division multiplexed) with the PSSCH in at least a portion of the slot, the first transmission power is excluded from a total available transmission power and then the second transmission power per RE is determined.