Measurement method and device for activating interfrequency...

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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C455S437000, C455S440000, C455S443000, C455S438000, C455S442000, C370S331000, C370S332000, C370S333000

Reexamination Certificate

active

07043242

ABSTRACT:
A method and device for avoiding adjacent channel interference and reducing disconnections caused thereby, during communication between a mobile device and a base station in a wireless telecommunications network. The mobile device measures the strength of a received signal before the signal enters one or more selected filters, and compares the strength of the signal after the filtering, in order to estimate a power ratio of the adjacent channel interference to communication channel power. If the power ratio is greater than a threshold, then a handover is requested to an alternative communication channel available between the mobile device and either the base station or another base station.

REFERENCES:
patent: 5918184 (1999-06-01), Wang
patent: 5999816 (1999-12-01), Tiedemann, Jr. et al.
patent: 6157668 (2000-12-01), Gilhousen et al.
patent: 0946076 (1999-09-01), None
patent: 0948231 (1999-10-01), None
patent: 2314734 (1998-01-01), None
patent: 0036867 (2000-06-01), None
Copy of co-pending U.S. Appl. No. 09/457,918, filed Dec. 9, 1999, entitled “Timing of Handover”.

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