Lucent Technologies Inc.

James E Hoch

Alex Lawrence Wierzbicki

Martine Madelaine Herpers

Farid Hacena

Christopher Lawrence Fernandez

Prashant Janardhan Kurdukar

Masoor Ramesh

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.

Handover control method and apparatus using fuzzy logic

A system and method, associated with a wireless base station system ('BSS') coupled to a mobile service center ('MSC') via a plurality of trunk lines, that allow the BSS to hunt the plurality of trunk lines for available channels to carry calls from the BSS to the MSC and a Groupe Speciale Mobile ('GSM') wireless infrastructure employing the system or the method. The system includes: (1) a signaling controller, associated with the BSS, that sends a command signal to the MSC to cause the MSC to bypass hunting for the available channels, the MSC acknowledging bypassing of the hunting to the signaling controller and (2) a trunk hunting controller, associated with the BSS, that is enabled when the MSC acknowledges the bypassing of the hunting to allow the BSS to hunt the plurality of trunk lines for the available channels to carry the calls from the BSS to the MSC, the trunk hunting controller capable of utilizing the trunk lines more efficiently than the MSC.

System and method for hunting trunk lines with a GSM wireless base

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Warrenville, IL, United States of America

James E Hoch