Method for electricity measurement for V2V communications in wireless communication system, and device for same
The present invention relates to a method for electricity measurement by a vehicle-to-vehicle (V2V) device for V2V communications in a wireless communication system and to a device therefor. In particular, the present invention comprises the steps of: receiving at least one synchronization signal for V2V through a physical sidelink broadcast channel (PSBCH); and measuring received electricity from said at least one synchronization signal if the ID of said at least one synchronization signal is linked to a demodulation reference signal (DMRS) sequence having, applied thereto, an orthogonal cover code (OCC) having one fixed value, wherein the measurement is performed by means of averaging for each ID of said at least one synchronization signal.
1. A method for a device communicating for vehicle-to-everything (V2X) communication, the method comprising:
mapping a synchronization signal and a demodulation reference signal (DMRS) associated with a physical sidelink broadcast channel (PSBCH) in a time domain unit for the V2X communication; and
transmitting a signal comprising the synchronization signal and the DMRS to a receiving end,
wherein the DMRS is mapped to resource elements on three symbols in the time domain unit,
wherein the DMRS uses two orthogonal cover codes (OCCs) each having three components,
wherein the two OCCs comprise a first OCC and a second OCC,
wherein the DMRS uses the first OCC when an identifier of the synchronization signal is even, and
wherein the DMRS uses the second OCC when the identifier of the synchronization signal is odd.
2. The method of claim 1 ,
wherein the first OCC corresponds to [1 1 1], and
wherein the second OCC corresponds to a phase shifted code of the first OCC.
3. The method of claim 1 , wherein the time domain unit corresponds to a subframe.
4. The method of claim 1 , wherein the three components of the first OCC or the second OCC are respectively applied to the three symbols in the time domain unit.
5. The method of claim 1 , wherein the PSBCH is mapped with the DMRS in the time domain unit.
6. A device communicating for vehicle-to-everything (V2X) communication, the device comprising:
a processor;
a memory coupled with the processor and storing information to operate the processor; and
a RF unit coupled with the processor,
wherein the processor is configured for:
mapping a synchronization signal and a demodulation reference signal (DMRS) associated with a physical sidelink broadcast channel (PSBCH) in a time domain unit for the V2X communication; and
transmitting a signal comprising the synchronization signal and the DMRS to a receiving end,
wherein the DMRS is mapped to resource elements on three symbols in the time domain unit,
wherein the DMRS uses two orthogonal cover codes (OCCs) each having three components,
wherein the two OCCs comprise a first OCC and a second OCC,
wherein the DMRS uses the first OCC when an identifier of the synchronization signal is even, and
wherein the DMRS uses the second OCC when the identifier of the synchronization signal is odd.
7. The device of claim 6 ,
wherein the first OCC corresponds to [1 1 1], and
wherein the second OCC corresponds to a phase shifted code of the first OCC.
8. The device of claim 6 , wherein the time domain unit corresponds to a subframe.
9. The device of claim 6 , wherein the three components of the first OCC or the second OCC are respectively applied to the three symbols in the time domain unit.
10. The device of claim 6 , wherein the PSBCH is mapped with the DMRS in the time domain unit.