Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-08-14
1998-08-11
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455515, 455 383, 4551611, 455343, H04Q 722
Patent
active
057941467
ABSTRACT:
A method is providing for a mobile station to vary the interval between scans by a mobile station for the beacon signals of cells in a communications system, in order to save battery power, when the mobile station is searching to select a serving cell. The method increases the interval between scans in response to the time elapsed since the start of the search. Initially, the scans are conducted with a small interval between the scans in the hope of quickly acquiring a serving cell. If a serving cell is not selected during this initial period of time, then the interval between scans is calculated to increase in response to the increase in elapsed time since the start of the search. If a serving cell is not selected during this period of calculated intervals, then the interval is set to a maximum limit to save battery power. A system for a mobile station to save power by varying the intervals between beacon signal scans when searching for a serving cell is also provided. The system and method provide a plurality of functions to calculate the scan intervals, and timing controls to vary when the calculated scan interval is to be applied in the search. In addition, the minimum and maximum scan intervals are variable is response to the likelihood of selecting a serving cell.
REFERENCES:
patent: 5301225 (1994-04-01), Suzuki et al.
patent: 5507039 (1996-04-01), Honma
patent: 5524278 (1996-06-01), Williams et al.
patent: 5627882 (1997-05-01), Chien et al.
Global System for Mobile Communications (GSM), Draft, pr ETS 300 578 , Mar. 1996, Sixth Edition, entitled Digital cCellular Telecommunications System (Phase 2); Radio Subsystem Link Control (GSM 05.08) published by European Telecommunications Standards Institute.
Sevcik Peter John
Vigil Jeffrey Scott
Eisenzopf Reinhard J.
Maliszewski Gerald W.
Ripma David C.
Sharp Kabushiki Kaisha
Sharp Microelectronics Technology Inc.
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