Mobile radio communication system having radio zones of sector c

Details Mobile radio communication system having radio zones of sector c Mobile radio communication system having radio zones of sector c

1994-12-20

1996-02-13

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455 332, 455 334, 455 333, 455 541, H04Q 700

Patent

active

054918332

ABSTRACT:
A method of selecting sector antenna which is capable of reducing interference and improving the efficiency of utilization of frequencies is applied to a mobile radio communication system wherein a plurality of sector antennas whose half-power beam widths are different from basically used normal sector antennas are used so as to cover the same areas in an overlapping state. A radio base station located within a corresponding zone covers a plurality of sector cells using the sector antennas provided for each of the corresponding sector cells. Further, some of the radio base stations employ a way to cover partial area overlapping a normal sector cell with a narrow sector cell using a sector antenna whose half-power beam width is small. Each radio base station has a predetermined constant according to the half-power beam width. When a radio terminal requests a call origination, the corresponding radio base station selects an antenna whose sum of a received level of a signal sent from the radio terminal and the constant is largest among the assignable sector antennas.

REFERENCES:
patent: 4144496 (1979-03-01), Cunningham et al.
patent: 5073971 (1991-12-01), Schaeffer
patent: 5193109 (1993-03-01), Chien-Yeh-Lee
patent: 5276907 (1994-01-01), Median
Yoshikawa et al., "Radio Zone Plans In Mobile Radio System", Research Practical Report, vol. 23, No. 8, (1974).
Andersson et al., "Adaptive Channel Allocation in a TIA IS-54 System", pp. 778-781, May 1992.

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