| 摘要 |
A base station 10 for an inner cell part and a base station 20 for an outer cell part are disposed at the center position of the outer cell part and the inner cell part, respectively. A service area is divided into a plurality of outer cell parts. Inside the outer cell parts, inner cell parts whose diameters are smaller than those of the outer cell parts and that have respective common centers are disposed. A channel controlling circuit 30 allocates optimum channels in such a manner that a third order intermodulation does in take place in the base stations 10 and 20. The base station for the inner cell part communicates radio waves with mobile stations in the inner cell part. The base station 20 for the outer cell part communicates radio waves with mobile stations in the outer cell part.
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