Resource selection method in vehicle to everything communication and apparatus therefore
Embodiments of the present disclosure provide a resource selection or reselection method by a user equipment (UE) and the UE in Vehicle to vehicle/pedestrian/infrastructure/network (V2X) communication. The method comprises the steps of: detecting physical sidelink control channel (PSCCH) transmitted by other UE(s); selecting (a) single-subframe resource(s) from single-subframe resources which do not overlap with single-subframe resources reserved by the detected PSCCH; and transmitting physical sidelink shared channel (PSSCH) on the selected single-subframe resource(s).
1. A method of operating a terminal in a wireless communication system, the method comprising:
in a case that a sum of transmission power of a first sidelink signal on a first carrier and transmission power of a second sidelink signal on a second carrier exceeds a maximum transmission power threshold, adjusting transmission power of a sidelink signal corresponding to a lowest priority among the transmission power of the first sidelink signal and the transmission power of the second sidelink signal; and
transmitting, to another terminal, at least one of the first sidelink signal or the second sidelink signal based on the adjusted transmission power.
2. The method of claim 1 , wherein a time domain resource allocated for transmission of the first sidelink signal and a time domain resource allocated for transmission of the second sidelink signal overlap each other.
3. The method of claim 1 , further comprising:
in a case that the sum of the transmission power of the first sidelink signal on the first carrier and the transmission power of the second sidelink signal on the second carrier exceeds the maximum transmission power threshold after the adjusting of the transmission power, adjusting transmission power of a sidelink signal corresponding to a lowest priority among sidelink signals other than the sidelink signal whose transmission power is adjusted.
4. The method of claim 3 , wherein the adjusting of the transmission power of the sidelink signal corresponding to the lowest priority among sidelink signals other than the sidelink signal whose transmission power is adjusted is performed until the sum of the transmission power of the first sidelink signal on the first carrier and the transmission power of the second sidelink signal on the second carrier is less than the maximum transmission power threshold.
5. The method of claim 1 , further comprising:
in a case that the terminal operates in a sidelink transmission mode 3, reporting, to a base station, a channel detection result for a resource pool corresponding to the first carrier and the second carrier in a subframe of a first index that satisfies at least one of predetermined conditions.
6. The method of claim 5 , wherein the reporting of the channel detection result comprises:
in a case that a bypass Buffer Status Report (BSR) condition is satisfied in the subframe of the first index and a service corresponding to the bypass BSR is a V2X service, reporting, to the base station, the channel detection result in the subframe.
7. The method of claim 5 , wherein the reporting of the channel detection result comprises:
receiving, from the base station, parameters associated with the reporting of the channel detection result, wherein the parameters comprise information about at least one of a period or subframe offset of the reporting of the channel detection result; and
reporting, to the base station, the channel detection result in the subframe of the first index based on the received parameters.
8. The method of claim 5 , wherein the reporting of the channel detection result comprises:
in a case that the subframe of the first index is a first subframe in which an uplink scheduling resource for the terminal is allocated after a subframe of a second index, reporting, to the base station, the channel detection result in the subframe of the first index,
wherein the subframe of the second index is a latest subframe in which the terminal receives an indication of the reporting of the channel detection result from the base station.
9. The method of claim 5 , wherein the channel detection result comprises a channel condition of at least one of subchannels within subframe range determined based on the subframe of the first index.
10. The method of claim 9 , wherein the channel condition of the at least one of subchannels comprises at least one of an average Sidelink-Receiving Signal Strength Indicator (S-RSSI) of the subchannels, a Reference Signal Receiving Power of a scheduled Physical Sidelink Shared Channel (PSSCH), a priority of PSSCH transmitted by a terminal that reserves the subchannels or a resource reservation period of a terminal that reserves the subchannels.
11. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor configured to:
in a case that a sum of transmission power of a first sidelink signal on a first carrier and transmission power of a second sidelink signal on a second carrier exceeds a maximum transmission power threshold,
adjust transmission power of a sidelink signal corresponding to a lowest priority among the transmission power of the first sidelink signal and the transmission power of the second sidelink signal, and
control the transceiver to transmit, to another terminal, at least one of the first sidelink signal or the second sidelink signal based on the adjusted transmission power.
12. The terminal of claim 11 , wherein a time domain resource allocated for transmission of the first sidelink signal and a time domain resource allocated for transmission of the second sidelink signal overlap each other.
13. The terminal of claim 11 , wherein the at least one processor is further configured to:
in a case that the sum of the transmission power of the first sidelink signal on the first carrier and the transmission power of the second sidelink signal on the second carrier exceeds the maximum transmission power threshold after the adjusting of the transmission power, adjust transmission power of a sidelink signal corresponding to a lowest priority among sidelink signals other than the sidelink signal whose transmission power is adjusted.
14. The terminal of claim 13 , wherein the adjustment of the transmission power of the sidelink signal corresponding to the lowest priority among sidelink signals other than the sidelink signal whose transmission power is adjusted is performed until the sum of the transmission power of the first sidelink signal on the first carrier and the transmission power of the second sidelink signal on the second carrier is less than the maximum transmission power threshold.
15. The terminal of claim 11 , wherein the at least one processor is further configured to:
in a case that the terminal operates in a sidelink transmission mode 3, report, to a base station, a channel detection result for a resource pool corresponding the first carrier and the second carrier in a subframe of a first index that satisfies at least one of predetermined conditions.
16. The terminal of claim 15 , wherein the at least one processor is further configured to:
in a case that a bypass Buffer Status Report (BSR) condition is satisfied in the subframe of the first index and a service corresponding to the bypass BSR is a V2X service, report, to the base station, the channel detection result in the subframe.
17. The terminal of claim 15 , wherein the at least one processor is further configured to:
receive, from the base station, parameters associated with the reporting of the channel detection result, wherein the parameters comprise information about at least one of a period or subframe offset of the reporting of the channel detection result, and
report, to the base station, the channel detection result in the subframe of the first index based on the received parameters.
18. The terminal of claim 15 , wherein the at least one processor is further configured to:
in a case that the subframe of the first index is a first subframe in which an uplink scheduling resource for the terminal is allocated after a subframe of a second index, report, to the base station, the channel detection result in the subframe of the first index,
wherein the subframe of the second index is a latest subframe in which the terminal receives an indication of the reporting of the channel detection result from the base station.
19. The terminal of claim 15 , wherein the channel detection result comprises a channel condition of at least one of subchannels within subframe range determined based on the subframe of the first index.
20. The terminal of claim 19 , wherein the channel condition of the at least one of subchannels comprises at least one of an average Sidelink-Receiving Signal Strength Indicator (S-RSSI) of the subchannels, a Reference Signal Receiving Power of a scheduled Physical Sidelink Shared Channel (PSSCH), a priority of PSSCH transmitted by a terminal that reserves the subchannels or a resource reservation period of a terminal that reserves the subchannels.