| 摘要 |
PURPOSE:To utilize a directivity of a base station antenna sufficiently and to build up a cellar system with less interference by arranging a channel of the same frequency to a location apart by (6n-3)R/2 in terms of X coordinate in the direction of maximum gain. CONSTITUTION:A channel of the same frequency is arranged to a sector covered by a directive antenna in which a maximum radiation direction of a radio base station whose orthogonal coordinate is given (0,3<1/2>Rk) (k is an optional integral number and R is a prescribed real number) is 0 deg. with respect to the positive direction of the X axis and a sector covered by a directive antenna in which a maximum radiation direction of a radio base station whose orthogonal coordinate is given (-3R/2,3<1/2>R(2k-1)/2)) is 180 deg. with respect to the positive direction of the X axis. Radio base stations 10, 20 are sectors arranged with channels of the same frequency and number of repetitive sectors is 18, and in order to cover the entire service area, channels of different frequencies require at minimum 18 channels.
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