US 5,499,395 A · Cellular mobile communication system having apparatus for changing boundaries of cells according to traffic condition

Abstract

Cellular mobile communication system includes a plurality of base stations connected to a relay station, each base station having adaptability for coping with change in traffic volume within a relevant cell covered thereby. Each base station includes a variable gain power amplifier for amplifying a pilot signal and a power control circuit for controlling the gain of the power amplifier. The power control circuit controls gain of a pilot signal sending power in accordance with a control signal supplied from a device installed in a relay station for monitoring traffic states of the individual base stations. The relay station issues a command for lowering the power gain for the base station which covers a traffic-concentrated cell while raising the power gain for the base stations covering the neighboring cells, to thereby contract the size of the traffic-concentrated cell. With a smaller number of base stations, communication demand can be controlled over a broad area.

Claims15

Dependent claims

A cellular mobile communication system, comprising:

a relay station connected to a network;
a plurality of base stations connected to said relay station via communication channels and defining cells, respectively;
first means for monitoring volume of traffic between mobile terminals resident within each of said cells and the base station located within each of said cells;
and
second means for controlling a boundary between a given one of said cells and a plurality of the cells adjacent to said given one in accordance with the traffic volume;
wherein said second means comprises means for changing the sending power of a pilot signal emitted from a given base station located within a given one of said cells and the sending power of a pilot signal emitted from a neighboring base station located within the cell adjacent to said given cell relative to each other in accordance with an output signal of said first means, the sending power of pilot signals emitted from the base stations being controlled independent of the sending power of transmission data from the base stations to the mobile terminals, said second means controlling the boundary between mutually adjacent cells based on the power level of a pilot signal received from each of said base stations.

3 more elements

Dependencies are inferred from the claim text.

Cellular mobile communication system having apparatus for changing boundaries of cells according to traffic condition

Life of this patent

Cellular mobile communication system having apparatus for changing boundaries of cells according to traffic condition

Life of this patent

Abstract

Claims15