Method of operating a communications system, a communications sy

Details Method of operating a communications system, a communications sy Method of operating a communications system, a communications sy

1991-11-08

1993-11-02

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 29, H04J 316

Patent

active

052589811

ABSTRACT:
In a cellular communication system an out-of-lock secondary station scans the physical channels of each of the respective carrier channels in order to find a carrier channel onto which to lock. In order to expedite such scanning, the secondary station follows a scanning sequence such that each scan is of consecutive physical channels of one of a series of non-adjacent carrier channels. Due to spill-over of transmitted beacon signals which may be present in the non-scanned adjoining carrier channels, it is possible during each scan to detect the presence of beacon signals in an adjoining non-scanned carrier channel as well as in the scanned channel. This achieves more rapid identification of an available physical channel in a carrier channel selected by the secondary station, thereby reducing the time to establish lock-on and so saving battery power. During each scan the secondary station may also monitor the signal strength in the respective physical channels for only a fraction of the duration of each channel, thereby reducing the time to select an available carrier channel having the best transmission characteristics.

REFERENCES:
patent: 4799219 (1989-01-01), Calvignac et al.
patent: 4914649 (1990-04-01), Schwendeman et al.
patent: 5014314 (1991-05-01), Mulford et al.
patent: 5042082 (1991-08-01), Dahlin
patent: 5088094 (1992-02-01), Grauel et al.
patent: 5095480 (1992-03-01), Fenner
patent: 5117423 (1992-05-01), Shepherd et al.
patent: 5150362 (1992-09-01), Akerberg

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