Hand-off filter for cellular mobile radio

Details Hand-off filter for cellular mobile radio Hand-off filter for cellular mobile radio

H - Electricity

04

B

325/31

H04B 7/26 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 1224528

Abstract of the Invention A cellular mobile radio-telephone system incorpor- ates hand-off equipment for effecting a hand off of communication links coupled to a mobile subscriber transceiver as the trans- ceiver travels from one cell to an adjoining cell. The hand- off equipment includes a filter which smooths voice channel signals received from the mobile transceivers so as to permit a more precise determination as to when a reduction in signal amplitude indicates the need for a hand-off. The operation of the filter includes long and short term averaging of a sequence of signal samples. Circuitry is also provided for predicting a time of signal fade-out based on differences in the amplitude of successive samples or groups of samples. Also disclosed is circuitry for commanding a change in transmitter gain in a transceiver as a function of signal fade-out.

483536

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