Communication system, communication method for the same and mobile station and base station used for the same

Abstract

A mobile station selecting one of a plurality of bands, obtaining two restored value candidates for respective adjacent bands in higher and lower directions by increasing or decreasing a predetermined step size by using the selected value as a reference, and generating relative value information on a restored value indicating which restored value candidate increased or decreased by the step size is the restored value candidate closer to the measured value as a bitmap. The mobile station transmits the communication channel quality information of the one band and the bitmap. The mobile station measures a communication channel quality of each of the plurality of bands obtained by dividing a communication band of a downlink.

1 . A communication system, in which a mobile station measures a communication channel quality of each of a plurality of bands obtained by dividing a communication band of a downlink and transmits, a result of the measurement to a base station via an uplink, wherein said mobile station comprises:
 first means for selecting one of the plurality of bands and obtaining two restored value candidates for respective adjacent bands in higher and lower directions by increasing or decreasing a predetermined step size by using the selected value as a reference, and generating relative value information on a restored value indicating which restored value candidate increased or decreased by said step size is the restored value candidate closer to the measured value as a bitmap; and   second means for transmitting at least the communication channel quality information of said one band and said bitmap.   
     
     
         2 . A communication system, in which a mobile station measures a communication channel quality of each of a plurality of bands obtained by dividing a communication band of a downlink and transmits, a result of the measurement to a base station via an uplink, wherein said mobile station comprises:
 first means for selecting one of said plurality of bands, setting a measured value of the selected band to a restored value, obtaining relative value information of each adjacent band by comparing said restored value and measured values of both of the adjacent bands in a higher and lower directions of said one band respectively, and generating said relative value information as a bitmap by performing the same procedure as obtaining a restored value of said each adjacent band by increasing or decreasing by a predetermined step size according to said relative value information also for the adjacent bands thereafter; and   second means for transmitting at least the communication channel quality information of said one band and said bitmap.   
     
     
         3 . The communication system according to  claim 1 , wherein said first means obtains a restored value by using said relative value information for each of a plurality of step sizes, and makes a step size by which the restored value is closer to the measured value said predetermined step size, and wherein said second means also transmits said step size. 
     
     
         4 . The communication system according to  claim 1 , wherein said first means replaces said measured value equal to or less than a predetermined value by the predetermined value.