Architecture utilizing frequency reuse in accommodating user-link and feeder-link transmissions

• US 6,751,458 B1
• Filed: 07/07/2000
• Issued: 06/15/2004
• Est. Priority Date: 07/07/2000
• 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., Cha, Alan, Chang, Ming U., Feria, Ying, Wang, Weizheng
• Primary Examiner(s): Maung, Nay
• Assistant Examiner(s): Orgad, Edan
• Application Number:
  US09/612,465
• Time in Patent Office: 1,439 Days
• Field of Search: 455/3.02, 455/12.1, 455/3.05, 455/427, 455/428, 455/429, 455/430, 455/443, 455/444, 455/446, 455/447, 455/448, 455/449, 455/452, 455/453, 455/452.1, 455/452.2, 455/13.2
• US Class Current: 455/427
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform
• CPC Class Codes: H04B 7/18539 Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A communication system has a high altitude communication device generating a plurality of user link beams having a first communication characteristic and a feeder link having a first communication characteristic. A gateway terminal receives the user link beam. A user terminal receives at least one of the user link beams. The plurality of user link beams comprises a first user link beam within a first cell and a first isolation zone outside the first cell. The plurality of user link beams comprises a second user link beam having the first communication characteristic and positioned within a second cell and a second isolation zone outside said second cell. The second isolation zone overlaps the first isolation zone. The feeder link is positioned within the first isolation zone and the second isolation zone. The feeder link has the first communication characteristic.

Claims

1. A communication system comprising:

a high altitude communication device generating a plurality of user link beams having a first communication characteristic and a feeder link beam having the first communication characteristic;

a gateway terminal receiving the feeder link beam;

a user terminal receiving at least one of said user link beams;

wherein said plurality of user link beams comprises a first user link beam within a first cell and a first isolation zone outside said first cell, and a second user link beam having a second isolation zone overlapping said first isolation zone, said feeder link positioned within said first isolation zone and said second isolation zone.

2. A communication system as recited in claim 1 wherein said first communication characteristics comprises a code.

3. A communication system as recited in claim 1 wherein said first communication characteristic comprises a frequency.

4. A communication system as recited in claim 1 wherein said high altitude communication device comprises a stratospheric platform.

5. A communication system as recited in claim 1 wherein said high altitude communication device comprises a satellite.

6. A communication system as recited in claim 1 wherein said feeder link has a third isolation zone within said first isolation zone and said second isolation zone.

7. A communication system as recited in claim 1 further comprising of plurality of gateway terminals, said high altitude communication device comprises a reflector having a plurality of feed horns corresponding to a respective one of the plurality of gateway terminals.

8. A communication system as recited in claim 1 wherein said gateway terminal is coupled to a terrestrial network.

9. A method of operating a communication system comprises the steps of:

generating a first user link beam having a first communication characteristic and a first isolation zone;

generating a second user link beam having the first communication characteristic and a second isolation zone at least partially overlapping said first isolation zone; and

,

generating a first feeder link beam having said first communication characteristic and positioned within said first isolation zone and said second isolation zone.

10. A method as recited in claim 9 further comprising the steps of generating a third user link having the first communication characteristic and a third isolation zone at least partially overlapping said second isolation zone;

and,

generating a second feeder link beam having the first communication characteristic and positioned within the second and third isolation zone.

11. A method as recited in claim 9 wherein the first communication characteristic comprises a code.

12. A method as recited in claim 9 wherein the first communication characteristic comprises a frequency.

13. A communication system having a first cell, a second cell and a third cell comprising:

a high altitude communication device generating a first user link beam having a first communication characteristic having a first center portion located within first cell and a first isolation zone located within the second cell, a second user link beam having the first communication characteristic having a second center portion located within a third cell and a second isolation zone located within the second cell and a first feeder link beam having the first communication characteristic located within the second cell.

14. A communication system as recited in claim 13 wherein said high altitude communication device comprises a stratospheric platform.

15. A communication system as recited in claim 13 wherein said high altitude communication device comprises a satellite.

16. A communication system as recited in claim 13 wherein said first communication characteristic comprises a code.

17. A communication system as recited in claim 13 wherein said first characteristic comprises a frequency.

18. A communication system as recited in claim 13 wherein said first feeder link beam has a third isolation zone within the second cell.

19. A communication system as recited in claim 13 wherein said first feeder link has a power greater than the first user link and the second user link.

20. A communication system as recited in claim 13 further comprising a second feeder link beam having the first communication characteristic located within the second cell.

21. A communication system as recited in claim 20 wherein said high altitude device comprises a reflector having a plurality of feed horns corresponding to said first feeder link coupled to said reflector and said second feeder link coupled to said reflector.