Call handover in a non-geostationary satellite constellation

Details Call handover in a non-geostationary satellite constellation Call handover in a non-geostationary satellite constellation

1998-02-23

2000-09-19

Nguyen, Lee

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455436, 455 121, 455429, 455427, H04Q 736

Patent

active

06122507&

ABSTRACT:
Following a call set-up request emitted by a terminal of a given user of a telecommunications system using a constellation of non-geostationary satellites, the terminal reserves a channel in the cell in which it is located and in neighboring cells not including all the cells it will have to cross during a predetermined time period. For each cell where a channel has not been reserved, the given user's terminal waits until it is at a predetermined distance from its point of handover into the cell, equal to the greatest distance a user can travel in the cell, before transmitting a reservation request. The call set-up request is accepted only if a condition relating to the number of other users near the given user at the time of the call set-up request is satisfied.

REFERENCES:
patent: 4718081 (1988-01-01), Brenig
patent: 5678184 (1997-10-01), Cutler, Jr. et al.
patent: 5777577 (1998-07-01), Kumar
patent: 5867765 (1999-02-01), Nilsson
patent: 5884164 (1999-03-01), Gerard et al.
"Mobile and Personal Satellite Communication 2" Proceedings of the Second European Workshop on Mobile/Personal Satcoms (EMPS '96), F. Vatalaro and F. Anassaso (eds.) Abstract, "Providing Appropriate Service Quality to Fixed and Mobile Users in Non-Geo Satellite-Fixed Cell System" Joaquin Restrepo et al. pp. 79-96.
Proceedings of the fourth International Mobile Satellite Conference 1995, Ottawa, Canada, Jun. 6-8, 1995, "A UT Positioning Approach for Dynamic Satellite Constellations" W.Zhao et al.pp. 35-40.

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