Method and device for determining sidelink transmission power in NR V2X
According to an embodiment of the present disclosure, provided is a method for a first device to perform sidelink communication. The method may include the steps of: determining sidelink transmission power, for transmission to a second device, as first transmission power on the basis of an OLPC parameter and at least one parameter pertaining to SL PL; transmitting a first PSCCH or a first PSSCH to the second device on the basis of the first transmission power; determining the sidelink transmission power as second transmission power on the basis of a transmission power control operation for the first transmission power being triggered; and transmitting a second PSCCH or a second PSSCH to the second device on the basis of the second transmission power.
1. A method for performing, by a first device, wireless communication, the method comprising:
determining an inter-device transmission power for transmission to a second device as a first transmission power, based on an open-loop power control parameter and at least one parameter related to inter-device pathloss;
transmitting a first inter-device physical control channel or a first inter-device physical shared channel to the second device, based on the first transmission power;
determining the inter-device transmission power as a second transmission power, based on a transmission power control operation for the first transmission power being triggered; and
transmitting a second inter-device physical control channel or a second inter-device physical shared channel to the second device, based on the second transmission power,
wherein the transmission power control operation for the first transmission power is triggered, based on a pre-configured number of inter-device reference signal received power values, related to the first inter-device physical control channel or the first inter-device physical shared channel, being not received from the second device.
2. The method of claim 1 , wherein the second transmission power is pre-configured.
3. The method of claim 2 , wherein the step of determining the inter-device transmission power as the second transmission power further includes:
resetting the open-loop power control parameter and the at least one parameter related to the inter-device pathloss, based on the transmission power control operation for the first transmission power being triggered; and
determining the inter-device transmission power as the second transmission power, based on the open-loop power control parameter and the at least one parameter related to the inter-device pathloss being reset.
4. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on at least one of a resource pool, a carrier, or a bandwidth part, used for inter-device communication between the first device and the second device being reconfigured.
5. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on a pre-configured number of negative feedbacks, related to the first inter-device physical shared channel or the first inter-device physical shared channel, being received from the second device based on an inter-device physical feedback channel.
6. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on a pre-configured number of negative feedbacks, related to the first inter-device physical control channel or the first inter-device physical shared channel, being continuously received from the second device based on an inter-device physical feedback channel.
7. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on a reception of a pre-configured number of inter-device feedbacks, related to the first inter-device physical control channel or the first inter-device physical shared channel, being failed, and
wherein the inter-device feedbacks are transmitted from the second device to the first device based on an inter-device physical feedback channel.
8. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on a reception of a pre-configured number of inter-device feedbacks, related to the first inter-device physical control channel or the first inter-device physical shared channel, being continuously failed, and
wherein the inter-device feedbacks are transmitted from the second device to the first device based on an inter-device physical feedback channel.
9. The method of claim 1 , wherein the transmission power control operation for the first transmission power is triggered, based on the open-loop power control parameter being reset by a base station.
10. The method of claim 1 , wherein the pre-configured number of inter-device reference signal received power values are not received from the second device, based on a pre-configured number of reference signals being not transmitted to the second device through the first inter-device physical control channel or the first inter-device physical shared channel, and
wherein the reference signals are for measurement of inter-device reference signal received power by the second device.
11. A first device for performing wireless communication, the first device comprising:
one or more memories storing instructions;
one or more transceivers; and
one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
determine an inter-device transmission power for transmission to a second device as a first transmission power, based on an open-loop power control parameter and at least one parameter related to inter-device pathloss;
transmit a first inter-device physical control channel or a first inter-device physical shared channel to the second device, based on the first transmission power;
determine the inter-device transmission power as a second transmission power, based on a transmission power control operation for the first transmission power being triggered; and
transmit a second inter-device physical control channel or a second inter-device physical shared channel to the second device, based on the second transmission power,
wherein the transmission power control operation for the first transmission power is triggered, based on a pre-configured number of inter-device reference signal received power values, related to the first inter-device physical control channel or the first inter-device physical shared channel, being not received from the second device.
12. An device configured to control a first user equipment (UE), the device comprising:
one or more processors; and
one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
determine an inter-UE transmission power for transmission to a second UE as a first transmission power, based on an open-loop power control parameter and at least one parameter related to inter-UE pathloss;
transmit a first inter-UE physical control channel or a first inter-UE physical shared channel to the second UE, based on the first transmission power;
determine the inter-UE transmission power as a second transmission power, based on a transmission power control operation for the first transmission power being triggered; and
transmit a second inter-UE physical control channel or a second inter-UE physical shared channel to the second UE, based on the second transmission power,
wherein the transmission power control operation for the first transmission power is triggered, based on a pre-configured number of inter-UE reference signal received power values, related to the first inter-UE physical control channel or the first inter-UE physical shared channel, being not received from the second UE.