UPLINK TRANSMISSION POWER CONTROL METHOD IN A WIRELESS COMMUNICATION SYSTEM
Provided is an uplink transmission power control method in a wireless communication system. Said method includes preferentially determining the transmission power of an uplink control channel, and determining the transmission power of an uplink data channel within the difference between the maximum transmittable power of a terminal and the transmission power of the uplink control channel, wherein the transmission of the uplink control signal through the uplink control channel and the transmission of the uplink data through the uplink data channel are performed at the same time using wireless resources different from one another. The present invention preferentially allocates the transmission power required for the transmission of an uplink control channel, and allocates residual power to an uplink data channel, thereby improving the effectiveness of power allocation when an uplink control signal and an uplink data signal are transmitted at the same time using physical resources different from one another.
1 . A method of controlling uplink transmission power in a wireless communication system, the method comprising:
determining preferentially transmission power of an uplink control channel; and
determining transmission power of an uplink data channel within a difference between maximum transmissible power of a user equipment and the transmission power of the uplink control channel,
wherein an uplink control signal transmitted through the uplink control channel and uplink data transmitted through the uplink data channel are simultaneously transmitted by using different radio resources.
2 . The method of claim 1 , wherein the transmission power of the uplink control channel is determined by the equation:
P ctrl =min( P PSD — total ,P PSD — ctrl )
where P ctrl is to-be-determined transmission power of the uplink control channel, P PSD — total is a predetermined maximum transmissible power level of the user equipment, and P PSD — ctrl is a temporary transmission power level of the uplink control channel.
3 . The method of claim 2 , wherein the temporary transmission power level of the uplink control channel is determined by the equation:
P PSD — ctrl (dBm)= L +SINR Target — ctrl +NI+OffsetAMS perAMS +OffsetABS perAMS
where P PSD — ctrl is the to-be-determined temporary transmission power level of the uplink control channel, L is an average estimation value of an uplink propagation loss, SINR Target — ctrl is a target signal-to-interference plus noise ratio (SINR) value of the uplink control channel received by a base station, noise and interference (NI) is an average estimation value between noise and an interference level, and OffsetAMS perAMS and OffsetABS perAMS are offset values controlled respectively by the user equipment and the base station.
4 . The method of claim 1 , wherein the transmission power of the uplink control channel is determined by the predetermined transmission power level.
5 . The method of claim 4 , wherein the transmission power of the uplink control channel is determined to a smaller value between the predetermined transmission power level and a transmission power level calculated by a power control formula.
6 . The method of claim 4 ,
wherein the uplink control channel is divided into a plurality of regions, and
wherein the transmission power level is preferentially determined for a region having a high priority by assigning priorities to the plurality of regions.
7 . The method of claim 1 , wherein the transmission power of the uplink data channel is determined by the equation:
P data =min( P PSD — total −P ctrl ,P PSD — data ),
where P data is to-be-determined transmission power of the uplink data channel, P PSD — total is a maximum transmissible power level of the user equipment, P ctrl is transmission power of the uplink control channel, and P PSD — data is a temporary transmission power level of the uplink data channel.
8 . The method of claim 7 , wherein the temporary transmission power level of the uplink data channel is determined by the equation:
P PSD — data (dBm)= L +SINR Target — data +NI+OffsetAMS perAMS +OffsetABS perAMS
where P PSD — data is a to-be-determined temporary transmission power level of the uplink data channel, L is an average estimation value of an uplink propagation loss, SINR Target — data is a target SINR value of the uplink data channel received by a base station, NI is an average estimation value between noise and an interference level, and OffsetAMS perAMS and OffsetABS perAMS are offset values controlled respectively by the user equipment and the base station.
9 . The method of claim 1 , wherein the transmission power of the uplink data channel is determined by a predetermined transmission power level.
10 . The method of claim 9 , wherein the transmission power of the uplink data channel is determined to a smaller value between the predetermined transmission power level and a transmission power level calculated by a power control formula.
11 . The method of claim 1 , wherein the uplink control channel and the uplink data channel belong to different regions divided according to a frequency.
12 . The method of claim 11 , wherein a region to which the uplink control channel belongs is a common region of a cell.
13 . The method of claim 12 , wherein a region to which the uplink data channel belongs is any one of a part of the common region remaining after the uplink control channel is allocated, an active region, and an inactive region.
14 . A user equipment in a wireless communication system, comprising:
a data processor for processing an uplink control signal and uplink data;
a power controller for controlling a power resource to be allocated to an uplink control channel and an uplink data channel; and
a radio frequency (RF) unit for transmitting the uplink control signal through the uplink control channel and for transmitting the uplink data through the uplink data channel,
wherein the power controller determines preferentially transmission power of an uplink control channel, and determines transmission power of an uplink data channel within a difference between maximum transmissible power of a user equipment and the transmission power of the uplink control channel.