Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-12-15
1999-03-02
Vo, Nguyen
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455524, 455 671, H04Q 720
Patent
active
058783423
ABSTRACT:
Methods and systems for estimating Supervisory Audio Tone (SAT) strength during data transfer and for a short time period thereafter. The SAT during this period is regarded as being identical to the strength measured just before the data transfer was started. In an alternative embodiment, a probabilistic algorithm can be used wherein previous measurements are used to predict the SAT strength during and for a period after data transfer. Where the present invention is used in a mobile radio telecommunications system of the type in which analog information is transmitted between at least one base station and a number of mobile stations, a method for supervising the quality of a connection between the base station and a mobile station includes transmitting data between the base station and the mobile station during which a SAT is not transmitted and using pre-data transfer SAT measurement for radio transmission quality supervision during at least a time period of said data transmitting step.
REFERENCES:
patent: 5001742 (1991-03-01), Wang
patent: 5008953 (1991-04-01), Dahlin et al.
Gustafson Karl Fredrik Robert
Lidfors Sven Gunnar Johnny
Lundberg Jan-Erik
Wahlstrom Lars Peter
Armstrong Darnell R.
Telefonaktiebolaget LM Ericsson
Vo Nguyen
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