Communication network with flexible handoff scheduling for mobil

Details Communication network with flexible handoff scheduling for mobil Communication network with flexible handoff scheduling for mobil

1994-08-01

1996-07-16

Faile, Andrew

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

455 332, 379 60, 342352, H04B 7185

Patent

active

055376797

ABSTRACT:
A communication network (10) includes a constellation (12) of mobile satellites (14) in low earth orbits and stationary gateways (24) near the surface of the earth. Data packets are routed through the network (10) using communication paths that change from moment to moment due to satellite movement. The routing paths are scheduled in advance (58) in response to predictable orbital satellite movement. The constellation (12) is configured so that only a minor amount of overlap in radio range exists between adjacent satellites (14). Gateways (24) include multiple, spaced apart antennas (30) that may be used to acquire arriving satellites (14'). When a gateway (24) has trouble quickly acquiring an arriving satellite (14'), an exception handoff time may be substituted for the scheduled normal handoff time at the gateway (24), departing satellite (14), and arriving satellite (14') involved.

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Mobile Satellite Communications Nov./1991, Author Steve Moritz, Handoff Design Consideration for the IRIDIUM.TM..

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