Patent ID: 6963754
Filing Date: 2005-11-08
Classification: H04W

Abstract:
1. A base station for transmitting a power control signal for controlling transmission power of a terminal station in a wireless communication system including a plurality of base stations and a plurality of terminal stations, each of the base stations, for measuring received powers of radio waves transmitted from said plurality of terminal stations, when there is a radio wave having received power being higher than a first threshold value, transmits a power-down control signal for instructing the terminal station which has transmitted the radio wave having received power being higher than the first threshold value to decrease the transmission power, and each of the terminal stations for decreasing the transmission power when there is said power-down control signal in at least one signal sent from the base stations, increasing the transmission power when said power-down control signal does not exist, comparing received powers of radio waves transmitted from the base stations with each other, selecting the base station which has transmitted the radio waves with the highest power, and transmitting a signal on which an identification code for identifying the base station is superimposed, wherein the base station for use in a transmission power control system comprises: a received power measuring part for measuring a received power of radio waves transmitted from a specific terminal station; a threshold memorizing part for holding said first threshold value and a second threshold value higher than said first threshold value; a comparing part for comparing the received power measured by said received power measuring part with said first and second threshold value; power control signal generating means for generating, in accordance with a result of said comparing part, a power-down control signal for instructing said specific terminal station to decrease the transmission power when said identification code transmitted from said specific terminal station indicates the own station and said measured received power is higher than said first threshold value, or when said identification code sent from said specific terminal station indicates another station and the received power of the radio wave transmitted from said specific terminal station is higher than said second threshold value, and generating a power-up control signal for giving an instruction to increase the transmission power of said specific terminal station or stop to transmit a power control signal for giving an instruction to increase the transmission power of said specific terminal station when said identification code transmitted from said specific terminal station indicates the own station and said measured received power is lower than said first threshold, or when said identification code sent from said specific terminal station indicates another station and said received power is lower than said second threshold value.