Method of handing off traffic in a low orbit satellite communication system serving terminals and communication system using a method of this kind
First Claim
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1. A terrestrial connection station for a low orbit satellite telecommunication system, comprising:
- means for receiving and transmitting signals to and from satellites in low orbit to connect them to a terrestrial central office; and
means for locating the satellite providing radio coverage of a satellite cell served by said station, said satellites being free of intersatellite links.
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Abstract
In a method of handing off traffic in a low orbit satellite communication system serving terminals, a terminal being connected to a terrestrial communication network by means of a connection station, handing off of the satellite-terminal and satellite-connection station links is possible only within a particular area. The decision to hand off the traffic is based on deterioration of the quality of service and of the radio environment for a group of terminals of said area. The system for implementing this method includes transmit/receive terminals and terrestrial connection stations.
5 Citations
7 Claims
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1. A terrestrial connection station for a low orbit satellite telecommunication system, comprising:
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means for receiving and transmitting signals to and from satellites in low orbit to connect them to a terrestrial central office; and means for locating the satellite providing radio coverage of a satellite cell served by said station, said satellites being free of intersatellite links. - View Dependent Claims (2, 3, 4)
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5. A terrestrial connection station for a low orbit satellite telecommunication system and comprising:
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means for receiving and transmitting signals to and from satellites in low orbit to connect them to a terrestrial central office; means for locating the satellite providing radio coverage of a satellite cell served by said station; and at least two main tracking antennas with their associated radio frequency and pointing subsystems, whereby said antennas can be oriented precisely towards the corresponding number of respective satellites on the basis of a satellite location function and the calculated ephemerides of said satellites. - View Dependent Claims (6)
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7. A terrestrial connection station for a low orbit satellite telecommunication system, comprising:
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a radio communication unit which receives and transmits signals to and from satellites in low orbit to connect them to a terrestrial central office; and a signal processing unit which calculates the location of the satellite providing radio coverage of a satellite cell served by said station, said satellites being free of intersatellite links.
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Specification