Satellite fleet deployment

• US 9,912,399 B2
• Filed: 03/27/2015
• Issued: 03/06/2018
• Est. Priority Date: 01/07/2013
• Status: Active Grant

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Dankberg, Mark
• Primary Examiner(s): DEAN, RAYMOND S
• Application Number:
  US14/671,779
• Publication Number:
  US 20150263802A1
• Time in Patent Office: 1,075 Days
• Field of Search: 455 121- 133, 455427-430, 370316
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance
• CPC Class Codes: H04B 7/18541 for handover of resources
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

Methods, systems, and devices are described for managing satellite communications through the deployment of a fleet of multi-beam satellites serving overlapping and non-overlapping spot beams. In these methods, systems, and devices, a first communication service associated with a relatively wider spot beam of a first satellite is provided to a first coverage area having multiple terminals. A second communication service associated with a relatively narrower spot beam (e.g., high-gain spot beam) of a second satellite is provided to a second coverage area located within the first coverage area. A subset of terminals located within the second coverage area is identified, and the terminals of the identified subset are transitioned from the first communication service of the wide spot beam of the first satellite to the second communication service of the high-gain spot beam of the second satellite.

Claims

1. A method for capacity enhancement of a satellite communication system comprising a first geostationary spot-beam satellite providing a communication service via a first set of fixed-location spot beams and a second geostationary spot beam satellite providing the communication service via a second set of fixed-location spot beams, the method comprising:

determining a demand profile for the communication service for a coverage region, the coverage region having a total demand for the communication service including one or more elevated demand regions, wherein the first set of fixed-location spot beams is positioned, such that providing the communication service by the first geostationary spot-beam satellite satisfies a first portion of the demand profile that is less than the total demand; and

determining a positioning of the second set of fixed-location spot beams that at least partially overlaps with the first set of fixed-location spot beams to form a multi-level spot beam service configuration for the coverage region based on the demand profile, wherein the determining the positioning is performed subsequent to deployment of the first geostationary spot-beam satellite and prior to deployment of the second geostationary spot-beam satellite, wherein at least a first spot beam of the first set of fixed-location spot beams has a first beam gain and a second spot beam of the second set of fixed-location spot beams has a second beam gain that is different from the first beam gain, the second spot beam at least partially overlapping with the first spot beam, such that providing the communication service by the second geostationary spot-beam satellite satisfies a second portion of the demand profile that is different from the first portion.

2. The method of claim 1, wherein determining the positioning of the second set of fixed-location spot beams comprises positioning the second spot beam in relation to the one or more elevated demand regions.

3. The method of claim 1, wherein a frequency range for the first set of fixed-location spot beams spans a system bandwidth, and wherein a frequency range for the second set of fixed-location spot beams also spans the system bandwidth.

4. The method of claim 3, wherein the first set of fixed-location spot beams are configured according to a tiled re-use pattern such that respective beams of the first set of fixed-location spot beams that are proximate with respect to each other are assigned to different beam colors of a first set of beam colors.

5. The method of claim 4, wherein the first set of beam colors comprises more than two orthogonal colors.

6. The method of claim 4, wherein the second set of fixed-location spot beams are configured according to a second set of beam colors.

7. The method of claim 6, wherein the second set of beam colors comprises two or fewer orthogonal colors.

8. The method of claim 6, wherein each color of the first set of beam colors and the second set of beam colors comprises a subset of the system bandwidth or a polarization, or a combination thereof.

9. The method of claim 3, wherein a first beam bandwidth allocated to the first spot beam comprises a first portion of the system bandwidth and a second beam bandwidth allocated to the second spot beam comprises at least the first portion of the system bandwidth.

10. The method of claim 1, further comprising:

identifying a change in demand for at least a portion of the coverage region.

11. The method of claim 10, wherein determining the positioning of the second set of fixed-location spot beams comprises adjusting the positioning based at least in part on the identified change in demand.

12. The method of claim 10, further comprising:

deploying a third spot beam in the multi-level spot beam service configuration based at least in part on the identified change in demand, wherein the third spot beam at least partially overlaps with at least one of the first spot beam or the second spot beam.

13. The method of claim 12, wherein the third spot beam is deployed via a third geostationary satellite providing the communication service via a third set of fixed-location spot beams comprising the third spot beam.

14. The method of claim 12, wherein the third spot beam has a third beam gain that is different from the first and second beam gains.

15. The method of claim 12, wherein the second spot beam and the third spot beam are directed to provide service to a same elevated demand region of the one or more elevated demand regions.

16. The method of claim 10, further comprising:

adjusting assignments of subscriber terminals within the coverage region to spot beams of the multi-level spot beam service configuration based at least in part on the identified change in demand.

17. The method of claim 1, further comprising:

assigning subscriber terminals within the coverage region to one of the first spot beam or the second spot beam based on the demand profile and capacities of the first spot beam and the second spot beam.

18. The method of claim 1, further comprising:

provisioning the communication service according to a determined capacity of the multi-level spot beam service configuration and the demand profile.

19. The method of claim 1, wherein the demand profile is determined based on one or more of density of subscriber terminals in the coverage region, population density in the coverage region, or demand for data throughput in the coverage region.

20. The method of claim 1, wherein determining the positioning of the second set of fixed-location spot beams comprises determining an amount of overlap between the second spot beam and the first spot beam.

21. The method of claim 1, wherein determining the positioning of the second set of fixed-location spot beams comprises determining an allocation of resources to the first spot beam, or an allocation of resources to the second spot beam.

22. The method of claim 3, wherein:

a first portion of the system bandwidth is allocated to the first spot beam of the first set of fixed-location spot beams and a second portion of the system bandwidth different from the first portion is allocated to a different spot beam of the first set of fixed-location spot beams; and

both the first and second portions of the system bandwidth are allocated to the second spot beam of the second set of fixed-location spot beams.

23. The method of claim 22, wherein the second spot beam of the second set of fixed-location spot beams at least partially overlaps with the different spot beam of the first set of fixed-location spot beams.

24. The method of claim 22, wherein the first portion and the second portion comprise an entirety of the system bandwidth.

25. The method of claim 22, wherein:

both the first portion and the second portion of the system bandwidth are allocated to a different spot beam of the second set of fixed-location spot beams;

the second spot beam and the different spot beam of the second set of fixed-location spot beams each at least partially overlap the first spot beam of the first set of fixed-location spot beams.

26. The method of claim 25, wherein the second spot beam and the different spot beam of the second set of fixed-location spot beams are assigned to a same color.

27. The method of claim 25, wherein the second spot beam and the different spot beam of the second set of fixed-location spot beams at least partially overlap and are assigned to different colors.

28. The method of claim 4, wherein coverage of a service area for the communications service provided by the tiled reuse pattern of the first set of fixed-location spot beams is substantially contiguous.

29. The method of claim 28, wherein the second set of fixed-location spot beams provide the communications service to elevated demand regions within the service area.

30. The method of claim 1, further comprising:

constructing the second geostationary spot-beam satellite to produce the second set of fixed-location spot beams to be positioned on orbit as defined by the positioning.