Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems

• US 7,218,931 B2
• Filed: 01/29/2003
• Issued: 05/15/2007
• Est. Priority Date: 09/14/2001
• Status: Expired due to Term

• Current Assignee: ATC Technology Corporation (FedEx Corporation)
• Original Assignee: ATC Technology Corporation (FedEx Corporation)
• Inventors: Karabinis, Peter D.
• Primary Examiner(s): Gesesse; Tilahun
• Application Number:
  US10/353,308
• Publication Number:
  US 20030153308A1
• Time in Patent Office: 1,567 Days
• Field of Search: 455/447, 455/446, 455/427, 455/430, 455/431, 455/422.1, 455/12.1, 455/13.4
• US Class Current: 455/427
• CPC Class Codes: G01N 35/00732 Identification of carriers, materials or components in automatic analysers
• CPC Class Codes: G01N 35/028 having reaction cells in the form of microtitration plates
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]

Abstract

A satellite radiotelephone system can include a space-based component and a plurality of ancillary terrestrial components. The space-based component is configured to provide wireless radiotelephone communications over a satellite radiotelephone frequency band. The plurality of ancillary terrestrial components are configured to terrestrially reuse at least one of the satellite radiotelephone frequencies, at least some of the ancillary terrestrial components terrestrially reusing the at least one of the satellite radiotelephone frequencies in a staggered sectorization. Related methods are also discussed.

Claims

1. A satellite radiotelephone system comprising:

a space-based component that is configured to provide wireless radiotelephone communications over a satellite radiotelephone frequency band including a plurality of satellite radiotelephone frequencies; and

a plurality of ancillary terrestrial components that are configured to terrestrially reuse at least one of the satellite radiotelephone frequencies, at least some of the ancillary terrestrial components terrestrially reusing the at least one of the satellite radiotelephone frequencies in a staggered sectorization;

wherein at least some of the ancillary terrestrial components are divided into n directional sectors and the at least one of the satellite radiotelephone frequencies is reused within the at least some of the ancillary terrestrial components so that an aggregate radiated power transmitted by the at least some of the ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies in any direction is no greater than approximately 1/n of a total radiated power transmitted by the at least some of the ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies.

2. A satellite radiotelephone system according to claim 1 wherein the space-based component is configured to provide wireless radiotelephone communications for a coverage area including the plurality of ancillary terrestrial components using at least one satellite radiotelephone frequency other than the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

3. A satellite radiotelephone system according to claim 2 wherein the space-based component is configured to provide a down-link to receiving radiotelephones in the coverage area using the at least one satellite radiotelephone frequency other than the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

4. A satellite radiotelephone system according to claim 2 wherein the space-based component is configured to provide wireless radiotelephone communications for a second coverage area not including the plurality of ancillary terrestrial components reusing the at least one of the satellite radiotelephone frequencies, wherein the space-based component provides wireless radiotelephone communications for the second coverage area using the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

5. A satellite radiotelephone system according to claim 1 wherein the at least one satellite radiotelephone frequency is used to provide radio downlinks from respective ancillary terrestrial components to receiving radiotelephones.

6. A satellite radiotelephone system comprising:

a space-based component that is configured to provide wireless radiotelephone communications over a satellite radiotelephone frequency band including a plurality of satellite radiotelephone frequencies; and

a plurality of ancillary terrestrial components that are configured to terrestrially reuse at least one of the satellite radiotelephone frequencies, at least some of the ancillary terrestrial components terrestrially reusing the at least one of the satellite radiotelephone frequencies in a staggered sectorization;

wherein each of the ancillary terrestrial components is divided into n directional sectors and the at least one of the satellite radiotelephone frequencies is reused within the plurality of ancillary terrestrial components so that an aggregate radiated power transmitted by the plurality of ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies in any direction is no greater than approximately 1/n of a total radiated power transmitted by the plurality of the ancillary terrestrial components at the at least one of the satellite-radiotelephone frequencies.

7. A satellite radiotelephone system according to claim 6 wherein n=3 so that each of the ancillary terrestrial components comprises three 120°

sectors.

8. A satellite radiotelephone system according to claim 6 wherein the plurality of ancillary terrestrial components is divided into a plurality of reuse clusters, and with each reuse cluster reusing the at least one of the satellite radiotelephone frequencies no more than once.

9. A satellite radiotelephone system comprising:

a space-based component that is configured to provide wireless radiotelephone communications over a satellite radiotelephone frequency band; and

a plurality of ancillary terrestrial components grouped into clusters of ancillary terrestrial components at least one ancillary terrestrial component of each cluster transmitting to a plurality of directional sectors, wherein the clusters reuse a satellite radiotelephone frequency from the satellite radiotelephone frequency band in a single directional sector of a single ancillary terrestrial component of the respective cluster and wherein a direction of the directional sectors reusing the satellite radiotelephone frequency is staggered;

wherein the ancillary terrestrial components transmitting to a plurality of directional sectors are divided into n directional sectors and the satellite radiotelephone frequency is reused within the clusters so that an aggregate of radiated power transmitted by the plurality of ancillary terrestrial components of the clusters at the satellite radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the ancillary terrestrial components of the clusters at the satellite radiotelephone frequency.

10. A satellite radiotelephone system according to claim 9 wherein the space-based component is configured to provide wireless radiotelephone communications for a coverage area including the plurality of ancillary terrestrial components using a satellite radiotelephone frequency other than the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered directional sectors.

11. A satellite radiotelephone system according to claim 10 wherein the space-based component is configured to provide a down-link to receiving radiotelephones in the coverage area using a satellite radiotelephone frequency other than the satellite radiotelephone frequency reused by the ancillary terrestrial components in the staggered directional sectors.

12. A satellite radiotelephone system according to claim 10 wherein the space-based component is configured to provide wireless radiotelephone communications for a second coverage area not including the plurality of ancillary terrestrial components reusing the satellite radiotelephone frequency in the staggered directional sectors, wherein the space-based component provides wireless radiotelephone communications for the second coverage area using the satellite radiotelephone frequency reused by the ancillary terrestrial components in the staggered directional sectors.

13. A satellite radiotelephone system according to claim 9 wherein the satellite radiotelephone frequency is used to provide radio downlinks from respective ancillary terrestrial components to receiving radiotelephones.

14. A satellite radiotelephone system according to claim 9 wherein n=3 so that the ancillary terrestrial components transmitting to a plurality of directional sectors comprises three 120°

sectors.

15. A satellite radiotelephone system according to claim 9 wherein each cluster reuses the satellite radiotelephone frequency no more than once.

16. A method of operating a satellite radiotelephone system comprising:

providing wireless radiotelephone communications from a space-based component over a satellite radiotelephone frequency band including a plurality of satellite radiotelephone frequencies; and

reusing at least one of the satellite radiotelephone frequencies to provide radiotelephone communications from a plurality of ancillary terrestrial components, wherein the at least one of the satellite radiotelephone frequencies is reused in a staggered sectorization;

wherein at least some of the ancillary terrestrial components are divided into n directional sectors and the at least one of the satellite radiotelephone frequencies is reused within the at least some of the ancillary terrestrial components so that an aggregate of radiated power transmitted by the at least some of the ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies in any direction is no greater than approximately 1/n of a total radiated power transmitted by the at least some of the ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies.

17. A method according to claim 16 wherein providing wireless radiotelephone communications from the space-based component further comprises providing wireless radiotelephone communications for a coverage area including the plurality of ancillary terrestrial components using at least one satellite radiotelephone frequency other than the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

18. A method according to claim 17 wherein providing wireless radiotelephone communications from the space-based component further comprises providing a down-link to receiving radiotelephones in the coverage area using the at least one satellite radiotelephone frequency other than the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

19. A method according to claim 17 wherein providing wireless radiotelephone communications from the space-based component further comprises providing wireless radiotelephone communications for a second coverage area not including the plurality of ancillary terrestrial components reusing the at least one of the satellite radiotelephone frequencies, wherein wireless radiotelephone communications for the second coverage area are provided using the at least one of the satellite radiotelephone frequencies reused by the ancillary terrestrial components in the staggered sectorization.

20. A method according to claim 16 wherein the at least one satellite radiotelephone frequency is used to provide radio downlinks from respective ancillary terrestrial components to receiving radiotelephones.

21. A method of operating a satellite radiotelephone system comprising:

providing wireless radiotelephone communications from a space-based component over a satellite radiotelephone frequency band including a plurality of satellite radiotelephone frequencies; and

reusing at least one of the satellite radiotelephone frequencies to provide radiotelephone communications from a plurality of ancillary terrestrial components, wherein the at least one of the satellite radiotelephone frequencies is reused in a staggered sectorization;

wherein each of the ancillary terrestrial components is divided into n directional sectors and the at least one of the satellite radiotelephone frequencies is reused within the plurality of ancillary terrestrial components so that an aggregate of radiated power transmitted by the plurality of ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies in any direction is no greater than approximately 1/n of a total radiated power transmitted by the plurality of the ancillary terrestrial components at the at least one of the satellite radiotelephone frequencies.

22. A method according to claim 21 wherein n=3 so that each of the ancillary terrestrial components comprises three 120°

sectors.

23. A method according to claim 21 wherein the plurality of ancillary terrestrial components is divided into a plurality of reuse clusters with each reuse cluster reusing the at least one of the satellite radiotelephone frequencies no more than once.

24. A method of operating a satellite radiotelephone system comprising:

providing wireless radiotelephone communications from a space-based component over a satellite radiotelephone frequency band; and

reusing a satellite radiotelephone frequency from the satellite radiotelephone frequency band to provide radiotelephone communications from a plurality of ancillary terrestrial components wherein the plurality of ancillary terrestrial components are grouped into clusters of terrestrial components with at least one ancillary terrestrial component of each cluster transmitting to a plurality of directional sectors and wherein a direction of the directional sectors reusing the satellite radiotelephone frequency is staggered;

wherein each of the ancillary terrestrial components transmitting to a plurality of directional sectors is divided into n directional sectors and the satellite radiotelephone frequency is reused within the clusters of ancillary terrestrial components so that an aggregate of radiated power transmitted by the clusters of ancillary terrestrial components at the satellite radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the clusters of the ancillary terrestrial components at the satellite radiotelephone frequency.

25. A method according to claim 24 wherein providing wireless radiotelephone communications from the space-based component further comprises providing wireless radiotelephone communications for a coverage area including the plurality of ancillary terrestrial components using a satellite radiotelephone frequency other than the satellite radiotelephone frequency reused by the ancillary terrestrial components in the staggered directional sectors.

26. A method according to claim 25 wherein providing wireless radiotelephone communications from the space-based component further comprises providing a down-link to receiving radiotelephones in the coverage area using the satellite radiotelephone frequency other than the satellite radiotelephone frequency reused by the clusters of ancillary terrestrial components in the staggered directional sectors.

27. A method according to claim 25 wherein providing wireless radiotelephone communications from the space-based component further comprises providing wireless radiotelephone communications for a second coverage area not including the plurality of ancillary terrestrial components reusing the satellite radiotelephone frequency in the staggered directional sectors, wherein wireless radiotelephone communications are provided for the second coverage area by the space-based component using the satellite radiotelephone frequency reused by the ancillary terrestrial components in the staggered directional sectors.

28. A method according to claim 24 wherein the satellite radiotelephone frequency is used to provide radio downlinks from respective ancillary terrestrial components to receiving radiotelephones.

29. A method according to claim 24 wherein n=3 so that the ancillary terrestrial components transmitting to a plurality of directional sectors comprises three 120°

sectors.

30. A method according to claim 24 wherein each cluster reuses the satellite radiotelephone frequency no more than once.

31. A radiotelephone system comprising:

a plurality of terrestrial components grouped into clusters of terrestrial components wherein at least one terrestrial component of each cluster transmits to a plurality of directional sectors, wherein a plurality of the clusters reuse a radiotelephone frequency in a single directional sector of a single terrestrial component of the respective cluster and wherein a direction of the directional sectors reusing the radiotelephone frequency is staggered;

wherein each of the terrestrial components transmitting to a plurality of directional sectors is divided into n directional sectors and the radiotelephone frequency is reused within the clusters of terrestrial components so that an aggregate of radiated power transmitted by the clusters of terrestrial components at the radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the clusters of terrestrial components at the radiotelephone frequency.

32. A radiotelephone system according to claim 31 wherein the radiotelephone frequency is used to provide radio downlinks from respective terrestrial components to receiving radiotelephones.

33. A radiotelephone system according to claim 31 wherein n=3 so that each of the ancillary terrestrial components transmitting to a plurality of directional sectors comprises three 120°

sectors.

34. A radiotelephone system according to claim 31 wherein each cluster reuses the radiotelephone frequency no more than once.

35. A radiotelephone system according to claim 31 wherein the radiotelephone frequency reused by the plurality of clusters is within a band of satellite frequencies transmitted by a space-based component.

36. A method of operating a radiotelephone system comprising:

reusing a radiotelephone frequency to provide radiotelephone communications from a plurality of terrestrial components wherein the plurality of terrestrial components are grouped into clusters of terrestrial components with at least one terrestrial component of each cluster transmitting to a plurality of directional sectors and wherein a direction of the directional sectors reusing the radiotelephone frequency is staggered;

wherein the terrestrial components transmitting to a plurality of directional sectors are divided into n directional sectors and the radiotelephone frequency is reused within the clusters of terrestrial components so that an aggregate of radiated power transmitted by the clusters of terrestrial components at the radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the plurality of the terrestrial components at the radiotelephone frequency.

37. A method according to claim 36 wherein the radiotelephone frequency is used to provide radio downlinks from respective terrestrial components to receiving radiotelephones.

38. A method according to claim 36 wherein n=3 so that the terrestrial components transmitting to a plurality of directional sectors comprises three 120°

sectors.

39. A method according to claim 36 wherein each cluster reuses the radiotelephone frequency no more than once.

40. A method according to claim 36 wherein the radiotelephone frequency reused by the plurality of clusters is within a band of satellite frequencies transmitted by a space-based component.

41. A method of providing communications comprising:

reusing a radiotelephone frequency among a plurality of terrestrial components to provide radiotelephone communications for a plurality of mobile terminals; and

randomizing reuse of the radiotelephone frequency among the plurality of terrestrial components;

wherein the plurality of terrestrial components are grouped into clusters of terrestrial components with at least one terrestrial component of each cluster transmitting to a plurality of directional sectors wherein randomizing reuse of the radiotelephone frequency comprises reusing the radiotelephone frequency in no more than one directional sector of a cluster of terrestrial components;

wherein the terrestrial components transmitting to a plurality of directional sectors are divided into n directional sectors and the radiotelephone frequency is reused within the clusters of terrestrial components so that an aggregate of radiated power transmitted by the clusters of terrestrial components at the radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the plurality of the terrestrial components at the radiotelephone frequency.

42. A method according to claim 41 wherein randomizing reuse of the radiotelephone frequency in no more than one directional sector of a cluster of terrestrial components comprises reusing the radiotelephone frequency so that a direction of the directional sectors reusing the radiotelephone frequency is staggered.

43. A method according to claim 41 wherein the radiotelephone frequency is used to provide downlinks from respective terrestrial components to receiving radiotelephones.

44. A method according to claim 41 wherein the radiotelephone frequency reused among the plurality of terrestrial components is within a band of satellite frequencies transmitted by a space-based component.

45. A communications system comprising:

means for reusing a radiotelephone frequency among a plurality of terrestrial components to provide radiotelephone communications for a plurality of mobile terminals; and

means for randomizing reuse of the radiotelephone frequency among the plurality of terrestrial components;

wherein the plurality of terrestrial components are grouped into clusters of terrestrial components with at least one terrestrial component of each cluster transmitting to a plurality of directional sectors wherein the means for randomizing reuse of the radiotelephone frequency comprises means for reusing the radiotelephone frequency in no more than one directional sector of a cluster of terrestrial components;

wherein the terrestrial components transmitting to a plurality of directional sectors are divided into n directional sectors and the radiotelephone frequency is reused within the clusters of terrestrial components so that an aggregate of radiated power transmitted by the clusters of terrestrial components at the radiotelephone frequency in any direction is no greater than approximately 1/n of a total radiated power transmitted by the plurality of the terrestrial components at the radiotelephone frequency.

46. A communications system according to claim 45 wherein the means for randomizing reuse of the radiotelephone frequency in no more than one directional sector of a cluster of terrestrial components comprises means for reusing the radiotelephone frequency so that a direction of the directional sectors reusing the radiotelephone frequency is staggered.

47. A communications system according to claim 45 wherein the radiotelephone frequency is used to provide downlinks from respective terrestrial components to receiving radiotelephones.

48. A communications system according to claim 45 wherein the radiotelephone frequency reused among the plurality of terrestrial components is within a band of satellite frequencies transmitted by a space-based component.