Patent ID: 8831665

Claim:
A power control method for controlling data transmission power of a mobile communication terminal or a base station by using an Adaptive Modulation and Coding (AMC) table in a mobile communication network employing an AMC scheme, the AMC table defining a plurality of modulation levels for data transmission, the power control method comprising the sequential steps of: (a) adaptively allocating a modulation level according to the AMC scheme based on changes in downlink conditions for the mobile communication terminal, and initializing the data transmission power, wherein the AMC table defines a plurality of power requests defined according to at least a movement speed of the mobile communication terminal for each of the plurality of the modulation levels, and the data transmission power is determined as a power corresponding to a maximum value from among the plurality of power requests associated with the allocated modulation level; (b) confirming start of data transmission and comparing a Bit Error Rate (BER) occurring in the data transmission with a preset critical BER; (c) at the allocated modulation level, decreasing the data transmission power by a predetermined value when the BER is smaller than the preset critical BER to reduce excessive transmission power; (d) at the allocated modulation level, increasing the data transmission power by a predetermined value when the BER is larger than the preset critical BER; and (e) at the allocated modulation level, maintaining the data transmission power at a current state when the BER is equal to the preset critical BER.