Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-05-13
1999-08-10
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455429, 455428, 455 121, H04Q 720
Patent
active
059373520
ABSTRACT:
The present invention includes a satellite based telecommunications system having an earth station network which enables user terminals to remain registered with a single visitor location register independent of satellite movement so long as the terminal remains within a fixed geographic location area. The preferred embodiment includes multiple earth stations which communicate with user terminals via coverage satellites. Each user terminal is registered with a single visitor location register. As the user passes between location areas, the user terminal re-registers at a new associated visitor location register. Earth stations and mobile-services switching center/visitor location registers (MSC/VLRs) are interconnected along a dedicated earth station network link. Communications data is passed along the earth station network link between MSC/VLRs and earth stations in a compressed and/or encoded format. Each MSC/VLR is interconnected along a terrestrial network link with a gateway and the public switching telephone network. Communications data is passed along the terrestrial network link in a decompressed and/or decoded format. Optionally, MSC/VLRs may be located physically remote from earth stations. When MSC/VLRs and earth stations are provided at a common physical site, a modem switch is provided to selectively interconnect the earth station and MSC/VLR and the earth station network link. Earth stations and MSC/VLRs communicate along the earth station network through wide area network interfaces.
REFERENCES:
patent: 5260987 (1993-11-01), Mauger
patent: 5303286 (1994-04-01), Wiedeman
patent: 5619209 (1997-04-01), Horstein et al.
patent: 5664006 (1997-09-01), Monte et al.
patent: 5710805 (1998-01-01), Armbruster
Courtney William F.
Wiher Christian H.
Armstrong Darnell R.
Eisenzopf Reinhard J.
TRW Inc.
Yatsko Michael S.
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