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

1991-12-04

1994-12-20

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

4551611, 455343, H04B 700, H04B 1702, H04B 116

Patent

active

053752546

ABSTRACT:
A communications system, such as the DECT, comprises a plurality of geographically separate primary stations and a plurality of secondary stations which are able to roam relative to the primary stations. Communication between a primary and a secondary station is by way of any of a plurality of time division duplex radio channels. An idle primary station transmits an idle beacon signal. When a secondary station roams out of the coverage area of a primary station and so can longer lock to that primary station, it scans all of the radio channels for an idle beacon signal. To conserve battery power, instead of continuously rescanning all channels, the successive rescans are made less frequently as the time interval from when the secondary station was last in lock increases, until a predetermined maximum interval has been reached between successive rescans.

REFERENCES:
patent: 4281413 (1981-07-01), Forrest
patent: 4833701 (1989-05-01), Comroe et al.
patent: 4977611 (1990-12-01), Maru
patent: 5023932 (1991-06-01), Wakana
patent: 5027428 (1991-06-01), Ishiguro et al.
patent: 5109530 (1992-04-01), Stengel

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