Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-02-20
1999-07-27
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 63, 455395, 370337, H04B 7212
Patent
active
059307161
ABSTRACT:
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.
REFERENCES:
patent: 5247699 (1993-09-01), Hartman
patent: 5509014 (1996-04-01), Utting
patent: 5551060 (1996-08-01), Fujii et al.
Fundamentals of Mobile Communication, Okumura et al., The Institute of Electronics, Information , and Communication Engineerts, Published by Korona-Shqa, 1986, Sections 8.2-8.2.3.
Reducing Interference on Same Channel in Mobvile Communication by Antenna Tilting, Fujii et al., 1990 Autumn National Convention of the Institute of electronics, Information, and Communication Engineers, B-247, 1990.
Intermodulation Interference in Radio Systems, Wallace C. Babcock, Aug. 25, 1952, pp. 63-73.
Eisenzopf Reinhard J.
Kincaid Lester G.
NEC Corporation
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