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| Browser system |
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| Reconfiguration of protocol stacks and/or frame type assignments in a network interface device |
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Multiple satellite repeater capacity loading with multiple spread spectrum gateway antennas
| Details |
Inventors: Wiedeman, Robert A.; Monte, Paul A.; Carter, Stephen S.; Ames, William;
Assignee: Globalstar L.P. (San Jose, CA); Qualcomm Incorporated (San Diego, CA)
Primary Examiner: Olms; Douglas W.
Assistant Examiner: Phillips; Matthew C.
Attorney, Agent or Firm:
A communication system (10), and a method executed by same, for allocating communications traffic through a plurality of satellites (12) of a constellation of low earth orbit satellites. Each of the plurality of satellites is oriented, at any given time when in view of a ground station (18), at a particular elevation angle. The method comprises the steps of: (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite. A number of different criteria can be employed in determining if a satellite can be assigned a new communication link, including: determining if the associated satellite has already been assigned a predetermined maximum number of communication links; and determining if the associated satellite, or a particular beam, is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth. Each of the steps of assigning is preferably accomplished such that the communication link is simultaneously established through at least two of the satellites to provide for diversity reception at a user's terminal (13). |
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DETAILED DESCRIPTION This invention is directed to a communication system, and to a method executed by same, for allocating communications traffic through a plurality of satellites of a constellation of low earth orbit satellites.
Each of the plurality of satellites is oriented, at any given time when in view of a ground station, at a particular elevation angle.
The method comprises the steps of (a) providing each of the plurality of satellites with a receiver for receiving communication links from the ground station and a transmitter for transmitting received communication links to user terminals; (b) in response to a request for service, determining if a highest elevation angle satellite can be assigned a new communications link; (c) if yes, assigning a new communication link to the highest elevation angle satellite; (d) if no, determining if a second highest elevation angle satellite can be assigned a new communications link; and (e) if yes, assigning a new communication link to the second highest elevation angle satellite.
Alternatively, a plurality of the satellites can be employed to transmit the communication link to the user terminal.
A number of criteria can be employed in determining if a satellite can be assigned a new communication link.
For example, each of the steps of determining may each include a step of determining if the associated satellite has already been assigned a predetermined maximum number of communication links.
Also by example, each of the steps of determining may each include a step of determining if the associated satellite is transmitting at or near to a power level that corresponds to a maximum peak flux density at the surface of the earth.
Further by example, it can be determined if a given satellite is transmitting at or near the satellite's peak transmit power.
A further determination can be based on which satellite will be in view of both the user and the gateway for some predetermined period of time.
In a presently preferred embodiment of this invention each satellite transmits a plurality of beams to the earth
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