Method and device for controlling power in wireless communication system
The present disclosure relates to: a communication technique combining a 5G communication system, for supporting a higher data transfer rate than 4G systems, with IoT technology; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. According to an embodiment of the present invention, a method of a terminal side link communication is characterized by further comprising: determining a first path attenuation between a second terminal and a first terminal; determining a second path attenuation between a base station and the first terminal; determining the transmission power of the first terminal based on at least one among the first pathloss and the second pathloss; and transmitting a signal based on the transmission power of the first terminal.
1. A method of power control performed by a first user equipment (UE) in a communication system, the method comprising:
identifying a downlink pathloss associated with a base station and a sidelink pathloss associated with a second UE;
identifying a first transmission power based on the downlink pathloss, at least one first parameter configured for downlink pathloss based power control, and a first subcarrier spacing (SCS) configuration;
identifying a second transmission power based on the sidelink pathloss, at least one second parameter configured for sidelink pathloss based power control, and a second SCS configuration;
identifying a third transmission power based on a maximum transmission power of the first UE, the first transmission power, and the second transmission power; and
transmitting a sidelink data based on the third transmission power,
wherein a power headroom report, including a power headroom, associated with the sidelink transmission is transmitted from the first UE to the second UE, and
wherein the power headroom is determined based on subtracting the first transmission power and the second transmission power from the maximum transmission power of the first UE.
2. The method of claim 1 ,
wherein the third transmission power is identified as a minimum value among the maximum transmission power, the first transmission power, and the second transmission power.
3. The method of claim 1 ,
wherein the downlink pathloss is identified based on a transmission power of a first reference signal transmitted from the base station and a reference signal received power (RSRP) of the first reference signal.
4. The method of claim 3 ,
wherein the RSRP of the first reference signal is an average power of resource elements that carry the first reference signal, and
wherein the first reference signal includes a secondary synchronization signal (SSS).
5. The method of claim 1 ,
wherein the sidelink pathloss is identified based on a transmission power of a second reference signal transmitted between the first UE and the second UE, and a reference signal received power (RSRP) of the second reference signal.
6. The method of claim 1 ,
wherein the at least one first parameter and the at least one second parameter are configured via a radio resource control (RRC) signaling.
7. A first user equipment (UE) in a communication system, comprising:
a transceiver; and
a controller configured to control to:
identify a downlink pathloss associated with a base station and a sidelink pathloss associated with a second UE,
identify a first transmission power based on the downlink pathloss, at least one first parameter configured for downlink pathloss based power control, and a first subcarrier spacing (SCS) configuration,
identify a second transmission power based on the sidelink pathloss, at least one second parameter configured for sidelink pathloss based power control, and a second SCS configuration,
identify a third transmission power based on a maximum transmission power of the first UE, the first transmission power, and the second transmission power, and
transmit, via the transceiver, a sidelink data based on the third transmission power,
wherein a power headroom report, including a power headroom, associated with the sidelink transmission is transmitted from the first UE to the second UE, and
wherein the power headroom is determined based on subtracting the first transmission power and the second transmission power from the maximum transmission power of the first UE.
8. The first UE of claim 7 ,
wherein the third transmission power is identified as a minimum value among the maximum transmission power, the first transmission power, and the second transmission power.
9. The first UE of claim 7 ,
wherein the downlink pathloss is identified based on a transmission power of a first reference signal transmitted from the base station and a reference signal received power (RSRP) of the first reference signal.
10. The first UE of claim 9 ,
wherein the RSRP of the first reference signal is an average power of resource elements that carry the first reference signal, and
wherein the first reference signal includes a secondary synchronization signal (SSS).
11. The first UE of claim 7 ,
wherein the sidelink pathloss is identified based on a transmission power of a second reference signal transmitted between the first UE and the second UE, and a reference signal received power (RSRP) of the second reference signal.
12. The first UE of claim 7 ,
wherein the at least one first parameter and the at least one second parameter are configured via a radio resource control (RRC) signaling.