Virtual gateway redundancy

• US 8,195,090 B2
• Filed: 08/11/2008
• Issued: 06/05/2012
• Est. Priority Date: 08/09/2007
• Status: Active Grant

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Treesh, Frederick, Miller, Mark J.
• Primary Examiner(s): LE, DANH C
• Application Number:
  US12/189,333
• Publication Number:
  US 20090042562A1
• Time in Patent Office: 1,394 Days
• Field of Search: 455/427, 455/12.1, 455/13.1, 342/354, 370/316
• US Class Current: 455/13.2
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A method and system are presented for providing satellite communications coverage for a geographical area involving operating a plurality of gateways including a first gateway and a second gateway, wherein the first gateway is configured to utilize at least one first spot beam associated with at least one first coverage area within the geographic area to provide relayed satellite communications to a plurality of first subscriber terminals located in the at least one first coverage area, wherein the second gateway is configured to utilize at least one second spot beam associated with at least one second coverage area within the geographic area to provide relayed satellite communications to a plurality of second subscriber terminals located in the at least one second coverage area, and upon a failure condition associated with the at least one first spot beam, expanding the at least one second coverage area to include a portion of the at least one first coverage area, to provide relayed satellite communications to at least some of the first subscriber terminals without utilizing the at least one first spot beam.

Claims

1. A method for providing satellite communications coverage for a geographical area comprising:

operating a satellite to generate at least one first spot beam and at least one second spot beam;

operating a plurality of gateways including a first gateway and a second gateway;

wherein the first gateway is configured to utilize the at least one first spot beam, the at least one first spot beam associated with at least one first coverage area within the geographic area to provide relayed satellite communications to a plurality of first subscriber terminals located in the at least one first coverage area;

wherein the second gateway is configured to utilize the at least one second spot beam, the at least one second spot beam associated with at least one second coverage area within the geographic area to provide relayed satellite communications to a plurality of second subscriber terminals located in the at least one second coverage area;

upon a failure condition associated with the at least one first spot beam, expanding the at least one second coverage area of the at least one second spot beam to include a portion of the at least one first coverage area, to provide relayed satellite communications to at least some of the first subscriber terminals without utilizing the at least one first spot beam,

wherein the at least one first coverage area is different from the at least one second coverage area,

wherein the plurality of first subscriber terminals are different from the plurality of second subscriber terminals, and

wherein the at least one second coverage area is expanded to included the at least one second coverage area and a portion of the at least one first coverage area.

2. The method of claim 1,

wherein the at least one second spot beam comprises at least two second spot beams associated with at least two second coverage areas that are expanded upon the failure condition,

wherein prior to expanding the at least two second coverage areas, the at least two second spot beams are configure to utilize a common color of frequency and polarization;

and

wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to utilize distinct colors of frequency and polarization to reduce effects of interference with one another.

3. The method of claim 2 wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to use separate frequency bands.

4. The method of claim 2 wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to use different polarizations.

5. The method of claim 1 wherein adaptive coding and modulation (ACM) is used to expand the at least one second coverage area.

6. The method of claim 1 wherein increased transmission power is used to expand the at least one second coverage area.

7. The method of claim 1 wherein the at least one first coverage area is adjacent to the at least one second coverage area.

8. The method of claim 1 wherein the first and second gateways are interconnected through a communication network.

9. The method of claim 1 wherein upon the failure condition associated with the at least one first spot beam, packets originally destined for the at least one first spot beam are routed to the second gateway to be transmitted using the at least second spot beam.

10. The method of claim 1 wherein the failure condition associated with the at least one first spot beam represents a failure at the first gateway causing no meaningful information to be transmitted through the at least one first spot beam.

11. A satellite communications system for providing coverage for a geographical area comprising:

a satellite configured to generate at least one first spot beam and at least one second spot beam;

a plurality of gateways including a first gateway and a second gateway;

wherein the first gateway is configured to utilize the at least one first spot beam the at least one first spot beam associated with at least one first coverage area within the geographic area to provide relayed satellite communications to a plurality of first subscriber terminals located in the at least one first coverage area;

wherein the second gateway is configured to utilize the at least one second spot beam, the at least one second spot beam associated with at least one second coverage area within the geographic area to provide relayed satellite communications to a plurality of second subscriber terminals located in the at least one second coverage area; and

wherein upon a failure condition associated with the at least one first spot beam, the second gateway is configurable to utilize the at least one second spot beam, the at least one second coverage area being expanded to include a portion of the at least one first coverage area, to provide relayed satellite communications to at least some of the first subscriber terminals without utilizing the at least one first spot beam,

wherein the at least one first coverage area is different from the at least one second coverage area,

wherein the plurality of first subscriber terminals are different from the plurality of second subscriber terminals,

wherein the at least one second coverage area is expanded to included the at least one second coverage area and a portion of the at least one first coverage area.

12. The satellite communications system of claim 11,

wherein the at least one second spot beam comprises at least two second spot beams associated with at least two second coverage areas that are expanded upon the failure condition,

wherein prior to expanding the at least two second coverage areas, the at least two second spot beams are configure to utilize a common color of frequency and polarization;

and

wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to utilize distinct colors of frequency and polarization to reduce effects of interference with one another.

13. The satellite communications system of claim 12 wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to use separate frequency bands.

14. The satellite communications system of claim 12 wherein upon expanding the at least two second coverage areas, the at least two second spot beams are configured to use different polarizations.

15. The satellite communications system of claim 11 wherein adaptive coding and modulation (ACM) is used to expand the at least one second coverage area.

16. The satellite communications system of claim 11 wherein increased transmission power is used to expand the at least one second coverage area.

17. The satellite communications system of claim 11 wherein the at least one first coverage area is adjacent to the at least one second coverage area.

18. The satellite communications system of claim 11 wherein the first and second gateways are interconnected through a communication network.

19. The satellite communications system of claim 11 wherein upon the failure condition associated with the at least one first spot beam, packets originally destined for the at least one first spot beam are routed to the second gateway to be transmitted using the at least second spot beam.

20. The satellite communications system of claim 11 wherein the failure condition associated with the at least one first spot beam represents a failure at the first gateway causing no meaningful information to be transmitted through the at least one first spot beam.