Patent ID: 8560000
Filing Date: 2013-10-15
Classification: H04W

Abstract:
1. A base station device for making radio communications with one or a plurality of mobile stations, comprising: a pilot signal transmitter module for transmitting a pilot signal; a receiver module for receiving a response to the pilot signal from a mobile station; a transmit power determination module for comparing received pilot signal quality data included in the responses from mobile stations and determining transmit power for transmission to each mobile station depending on a result of the comparison; and a mobile station signal transmitter module for transmitting a signal to the mobile station or mobile stations at the determined transmit power; wherein the transmit power determination module: holds first criterion value indicating minimum channel quality for mobile stations within a communication range of the base station; creates quality data based on reports from one or a plurality of mobile stations and stores the quality data; creates a first index indicating channel quality difference between mobile stations from the stored quality data; and determines transmit power depending on a result of comparison between the first index and the first criterion value; wherein the transmit power determination module changes transmit power when the first index is larger than the first criterion value; wherein the transmit power determination module holds a second criterion value indicating channel quality difference allowed between mobile stations within a communication range of the base station, selects a mobile station having the first index larger than the first criterion value and determines transmit power so as to make a channel quality value of the mobile station not larger than the second criterion value.