Integrating coverage areas of multiple transponder platforms

• US 6,868,269 B1
• Filed: 08/28/2000
• Issued: 03/15/2005
• Est. Priority Date: 08/28/2000
• Status: Expired due to Term

• Current Assignee: DIRECTV, LLC (AT&T, Inc.)
• Original Assignee: The DIRECTV Group, Inc. (AT&T, Inc.)
• Inventors: Chang, Donald C. D., Feria, Ying, Hagen, Frank A., Wang, Weizheng, Yung, Kar
• Primary Examiner(s): APPIAH, CHARLES NANA
• Application Number:
  US09/649,355
• Time in Patent Office: 1,660 Days
• Field of Search: 455/446, 455/447, 455/450, 455/422, 455/562, 455/25, 455/427, 455/431, 455/13.1, 455/429, 455/67.7, 455/67.11, 370/316
• US Class Current: 455/429
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures

Abstract

A method for integrating coverage areas of multiple transponder platforms includes the step of arranging a plurality of coverage areas in a cluster wherein each of the plurality of coverage areas is assigned a color that differs from that of every other coverage area in a same cluster and wherein each of the plurality of coverage areas overlaps at least one other coverage area in the same cluster for maximizing utilization of multiple system resources.

Claims

1. A method for integrating coverage areas for multiple transponder platforms comprising the step of arranging a plurality of coverage areas in a cluster wherein each of the plurality of coverage areas is assigned a color that differs from that of every other coverage area in the cluster and wherein each of the plurality of coverage areas overlaps at least one other coverage area in the cluster for maximizing utilization of multiple system resources.

2. The method of claim 1 wherein each of the plurality of coverage areas has a center that defines a vertex of an N-sided polygon.

3. The method of claim 2 wherein N is one of 3 and 4.

4. The method of claim 1 wherein every point in the lattice is covered by at least one of the plurality of coverage areas.

5. The method of claim 1 further including the step of shaping at least one of the plurality of coverage areas so that the at least one of the plurality of coverage areas is defined by a circle having a radius r.

6. The method of claim 1 further including the step of maintaining an exclusion band around at least one of the plurality of coverage areas wherein the exclusion band has an outer perimeter that does not intersect any other of the plurality of coverage areas assigned the same color.

7. The method of claim 6 wherein the width of the exclusion band is substantially equal to a diameter of a spot beam.

8. The method of claim 6 further including the step of assigning a color outside the at least one of the plurality of coverage areas, the color not being excluded by the exclusion band around the at least one of the plurality of coverage areas.

9. The method of claim 1 wherein at least one of the plurality of coverage areas comprises a plurality of spot beams.

10. The method of claim 9 further including the step of shaping the at least one of the plurality of coverage areas by illuminating a selected group of the plurality of spot beams within the at least one of the plurality of coverage areas to maintain a desired separation among the plurality of coverage areas assigned a same color.

11. A method as recited in claim 9 further comprising forming a reuse pattern within the same color with the plurality of spot beams.

12. A method as recited in claim 1 wherein the cluster comprises more than two colors.

13. An apparatus for integrating coverage areas comprising:

a plurality of transponder platforms; and

an antenna coupled to each of the plurality of transponder platforms wherein;

each antenna illuminates one of a plurality of coverage areas;

the plurality of coverage areas are grouped into at least one cluster,

each of the plurality of coverage areas in each cluster of the at least one cluster is assigned a color that differs from that of every other coverage area in each cluster of the at least one cluster, and

each of the plurality of coverage areas in each cluster of the at least one cluster overlaps at least one other coverage area in each cluster of the at least one cluster for maximizing utilization of multiple system resources.

14. The apparatus of claim 13 wherein each of the plurality of coverage areas has a center that defines a vertex of an N-sided polygon.

15. The apparatus of claim 14 wherein N is one of 3 and 4.

16. The apparatus of claim 13 wherein the at least one cluster is arranged in a lattice wherein none of the plurality of coverage areas assigned a same color overlaps another of the plurality of coverage areas assigned the same color.

17. The apparatus of claim 16 wherein every point in the lattice is covered by at least one of the plurality of coverage areas.

18. The apparatus of claim 16 wherein at least one of the plurality of coverage areas has a shape defined by a circle having a radius r.

19. The apparatus of claim 16 wherein an exclusion band is maintained around at least one of the plurality of coverage areas wherein the exclusion band has an outer perimeter that does not intersect any other coverage area assigned the same color.

20. The apparatus of claim 19 wherein the width of the exclusion band is substantially equal to a diameter of a spot beam.

21. The apparatus of claim 19 wherein a color is assigned outside the at least one of the plurality of coverage areas, the color not being excluded by the exclusion band around the at least one of the plurality of coverage areas assigned the same color.

22. The apparatus of claim 13 wherein at least one of the plurality of coverage areas comprises a plurality of spot beams.

23. The apparatus of claim 22 wherein at least one of the plurality of coverage areas is shaped by illuminating a selected group of the plurality of spot beams within the at least one of the plurality of coverage areas to maintain a desired separation among the plurality of coverage areas assigned a same color.

24. The apparatus of claim 22 further comprising a beamformer for forming the spot beams.

25. The apparatus of claim 13 wherein at least one of the plurality of transponder platforms is one of a satellite, an antenna tower, and an aircraft.

26. A method for integrating coverage areas for a plurality of transponder platforms comprising the steps of:

forming a plurality of coverage areas each from a respective one of the plurality of transponder platforms;

arranging a plurality of coverage areas in a cluster wherein each of the plurality of coverage areas is formed from a plurality of spot beams, and out of a total number of colors, each of the plurality of coverage areas is assigned only one color, said only one color differing from that of every other coverage area in the same cluster and wherein each of the plurality of coverage areas overlaps at least one other coverage area in the same cluster.

27. A method as recited in claim 26 further comprising illuminating only specific spot beams of the plurality of spot beams to maintain a desired separation between coverage areas.

28. A method as recited in claim 26 further comprising adjusting the sizes of the plurality of coverage areas.

29. A method as recited in claim 26 further comprising increasing power to a user by adjusting the sizes of the plurality of coverage areas.

30. A method as recited in claim 26 further comprising adjusting the shapes of the plurality of coverage areas.

31. A method as recited in claim 26 further comprising assigning only one transponder to a platform.

32. A method as recited in claim 26 wherein the total number of colors is greater than 2.

33. A method as recited in claim 26 wherein the total number of colors is greater than 3.

34. A method as recited in claim 26 wherein the cluster is arranged in a lattice where none of the plurality of coverage areas is assigned a same color or overlaps another of the plurality of coverage areas assigned the same color.

35. A method as recited in claim 34 wherein every point in the lattice is covered by at least one of the plurality of coverage areas.

36. A method as recited in claim 34 wherein at least one of the plurality of coverage areas has a shape defined by a circle having a radius r.

37. A method as recited in claim 34 further comprising maintaining an exclusion band around at least one of the plurality of coverage areas wherein the exclusion band has an outer perimeter that does not intersect any other of the plurality of coverage areas assigned the same color.

38. A method as recited in claim 37 wherein the width of the exclusion band is substantially equal to the diameter of one spot beam of the plurality of spot beams.

39. A method of providing coverage in a communication system comprising:

forming a cluster by overlapping a plurality of coverage areas corresponding to a respective transponder;

from a total number of colors, assigning only one color for a plurality of spot beams associated with each transponder of the communication system;

forming a resource reuse pattern for the plurality of spot beams within each of the plurality of coverage areas and wherein the cluster is arranged in a lattice where none of the plurality of coverage areas is assigned a same color or overlaps another of the plurality of coverage areas assigned the same color.

40. A method as recited in claim 39 wherein every point in the lattice is covered by at least one of the plurality of coverage areas.

41. A method as recited in claim 39 wherein at least one of the plurality of coverage areas has a shape defined by a circle having a radius r.

42. A method as recited in claim 39 further comprising maintaining an exclusion band around at least one of the plurality of coverage areas wherein the exclusion band has an outer perimeter that does not intersect any other of the plurality of coverage areas assigned the same color.

43. A method as recited in claim 39 wherein the width of the exclusion band is substantially equal to the diameter of one spot beam of the plurality of spot beams.

44. A method as recited in claim 39 further comprising illuminating only specific spot beams of the plurality of spot beams to maintain a desired separation between coverage areas.

45. A method as recited in claim 39 further comprising adjusting the sizes of the plurality of coverage areas.

46. A method as recited in claim 39 further comprising increasing power to a user by adjusting the sizes of the plurality of coverage areas.

47. A method as recited in claim 39 further comprising adjusting the shapes of the plurality of coverage areas.

48. A method as recited in claim 39 further comprising only one transponder to a platform.

49. A method as recited in claim 39 wherein the total number of colors is greater than 2.

50. A method as recited in claim 39 wherein the total number of colors is greater than 3.