Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Reexamination Certificate
2000-04-10
2004-01-27
Tran, Sinh (Department: 2681)
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
C455S013100, C455S016000, C455S427000, C455S428000, C455S426100, C455S430000, C455S003050, C455S517000, C455S450000, C704S221000
Reexamination Certificate
active
06684056
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates generally to satellite communications, and more particularly to a system and technique for combining MEO and LEO satellite constellations in a communication system for improved communications performance.
2. Discussion
Presently known satellite communication networks use either low-earth orbit (LEO), medium-earth orbit (MEO) or geosynchronous (GEO) satellite constellations to transfer voice, data or video signals from a source to a destination. Such satellite constellations have distinct advantages and disadvantages. For example, MEO orbits are optimized for multiple satellite diversity systems with low link margins. On the other hand, LEO satellites provide a higher link margin and support higher data rates into a given size subscriber unit because of their reduced path loss. However, a LEO based satellite communication system typically requires more satellites for a given coverage area. Accordingly, it is desirable to provide a satellite based communication system which utilizes LEO and MEO satellites for optimizing communication performance and services to the system subscribers. It is further desirable to provide a technique for deciding whether the LEO satellite or the MEO satellite is better for carrying the communication session with a particular subscriber.
REFERENCES:
patent: 5812968 (1998-09-01), Hassan et al.
patent: 5887257 (1999-03-01), Olds
patent: 5896558 (1999-04-01), Wiedeman
patent: 6078810 (2000-06-01), Olds et al.
Emmons, Jr. Thomas Peter
Erlick John R.
Fullerton Craig L.
Gross Jonathan H.
Harris Susan L.
Borsch Bradley J.
Motorola Inc.
Nguyen David
Tran Sinh
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