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

1997-10-07

1999-03-16

To, Doris H.

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455 121, 455436, 455440, 455450, H04B 7185

Patent

active

058841644

ABSTRACT:
Following a call set-up request transmitted 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: 5390339 (1995-02-01), Bruckert et al.
patent: 5619551 (1997-04-01), Yahagi
patent: 5642355 (1997-06-01), Smith

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