Handover control method and apparatus using fuzzy logic

Details Handover control method and apparatus using fuzzy logic Handover control method and apparatus using fuzzy logic

1998-01-20

2000-10-31

Nguyen, Lee

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455438, H04Q 720

Patent

active

061415537

ABSTRACT:
A method and an apparatus for using fuzzy logic to determine when handovers are desirable and the extent to which the radio transmission power in a cellular telephone network should be adjusted. The mobile phone and the base transceiver station measure certain system parameters, including rate of handover, quality, distance, level, call duration, and power. These measurements are input to a fuzzifier. The fuzzifier applies standard fuzzy-set-theory membership functions to the measurements, and the fuzzifier outputs a set of fuzzy variables corresponding to the measurements. The fuzzifier outputs are input to an inference engine. The inference engine contains a set of rules that, when applied to the inference engine inputs, indicate: when a handover should be performed; when a handover should not be performed; and the amount by which, if any, the transmission power should be adjusted.

REFERENCES:
patent: 5189734 (1993-02-01), Bailey et al.
patent: 5579306 (1996-11-01), Dent
patent: 5719898 (1998-02-01), Davidovici et al.

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