Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-08-31
1998-03-24
Eisenzopi, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455427, 455443, 370321, 370331, 370337, H04B 700, H04B 7185, H04Q 720, H04J 316
Patent
active
057323518
ABSTRACT:
In a satellite communication system (10), a subscriber unit (26) is assigned a communication channel (17). The channel is used in the present cell (54) as well as subsequent cells (54) as the cells move relative to the earth. The channel is assigned using a cost function which includes a distance factor and an isolation factor. The distance factor which is based on a geographic distance between the nearest use of an interfering channel and the subscriber unit's cell. The isolation factor includes an interference potential between two channels. As a result of this channel assignment process, channels become associated with the geographic location of the subscriber unit. Accordingly, subscriber unit communications on the same satellite are handed-off between cells using the same channel making hand-offs invisible to the subscriber unit (26). When a hand-off is needed to another satellite, the same channel may also be used, or a new channel assigned using the cost function.
REFERENCES:
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5109528 (1992-04-01), Uddenfeldt
patent: 5408237 (1995-04-01), Patterson et al.
patent: 5483664 (1996-01-01), Moritz et al.
patent: 5491717 (1996-02-01), Hall
patent: 5559806 (1996-09-01), Kurby et al.
Davieau Gerald Joseph
Olds Keith Andrew
Redden James Powers
Bhattachavya Sam
Eisenzopi Reinhard J.
Gorrie Gregory J.
Motorola Inc.
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