Managing satellite fixed beam uplink using virtual channel assignments

• US 6,993,288 B2
• Filed: 07/17/2002
• Issued: 01/31/2006
• Est. Priority Date: 07/17/2002
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Quadracci, Leonard J., de La Chapelle, Michael, Morse, David C.
• Primary Examiner(s): LE, DANH C
• Application Number:
  US10/197,146
• Publication Number:
  US 20040014472A1
• Time in Patent Office: 1,294 Days
• Field of Search: 455/429, 455/447, 455/446, 455/450, 455/427, 455/431, 455/13.1, 455/25, 455/12.1, 370/316, 370/315, 342/352, 342/354
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A method of coordinating communications between ground stations and fixed beam satellites is provided, wherein each beam of a satellite antenna is assigned a color to create a color pattern that matches a frequency reuse pattern for the antenna, thereby using the same frequencies in a different beam with the same color. In operation, a ground station requests a virtual channel number from a resource manager, which sends a virtual channel number that is not used by another ground station within a beam diameter of the requesting ground station. The ground station then determines the position of the satellite, the beam and beam color, and further computes the frequency, polarization, and time slot, among other information, to communicate with the satellite. A method is also provided for managing virtual channels that comprises a network manager that groups ground stations and limits the number of virtual channels per group.

Claims

1. A method of coordinating communications between ground stations and fixed beam satellites, the method comprising the steps of:

(a) assigning a color to each beam of an antenna on a satellite to create a color pattern, wherein the color pattern matches a frequency reuse pattern for the antenna;

(b) dividing a number of user channels allocated to the satellite into equal groups that equal the number of beam colors within the color pattern;

(c) requesting a virtual channel from a resource manager;

(d) searching for available channels and sending a virtual channel number to the ground station, wherein the virtual channel number is assigned to the ground station when the same virtual channel number is not used by another ground station within a beam diameter of the requesting ground station;

(e) receiving the virtual channel number and satellite parameters; and

(f) determining an uplink frequency and polarization based on the virtual channel number and satellite parameters by the ground station,

wherein identical frequencies are reused in a different beam with the same color and the ground station moves between beam colors over time.

2. The method of claim 1, wherein the satellite parameters comprise satellite location and satellite attitude.

3. The method of claim 1, wherein the beam colors are divided by TDMA blocks.

4. The method of claim 1, wherein the beam colors are divided by CDMA blocks.

5. The method of claim 1, wherein the beam colors are divided into virtual beamlets having different colors.

6. The method of claim 1, wherein the satellites maintain a list of ground stations with uplink capacity, wherein the list comprises a virtual channel number and a location for each ground station.

7. The method of claim 1, wherein the reuse pattern is defined by distances from the center of a beam to the edge of a beam with the same color.

8. The method of claim 1, wherein the virtual channel number of the ground station passes from satellite to satellite such that a footprint overlap area is less than one uplink cell.

9. The method of claim 1, wherein the virtual channel number of the ground station passes from satellite to satellite independent of phasing.

10. The method of claim 1, wherein the virtual channel number of the ground station passes from satellite to satellite independent of matching orientations.

11. The method of claim 1, wherein the ground stations are registered with a network manager that assigns the virtual channel numbers to classes of ground stations.

12. A method of coordinating communications between ground stations and fixed beam satellites, the method comprising the steps of:

(a) assigning a color to each beam of an antenna on a satellite to create a color pattern, wherein the color pattern matches a frequency reuse pattern for the antenna;

(b) dividing a number of user channels allocated to the satellite into equal groups that equal the number of beam colors within the color pattern;

(c) allocating virtual channel numbers to ground stations, wherein the virtual channel number is assigned to the ground station when the same virtual channel number is not used by another ground station within a beam diameter of the requesting ground station; and

(d) computing uplink frequency and polarization based on the virtual channel number and satellite parameters by the ground station,

wherein identical frequencies are reused in a different beam with the same color and the ground station moves between beam colors over time.

13. The method of claim 12, wherein the satellite parameters comprise satellite location and satellite attitude.

14. The method of claim 12, wherein the beam colors are divided by TDMA blocks.

15. The method of claim 12, wherein the beam colors are divided by CDMA blocks.

16. The method of claim 12, wherein the beam colors are divided into virtual beamlets having different colors.

17. The method of claim 12, wherein the satellites maintain a list of ground stations with uplink capacity, wherein the list comprises a virtual channel number and a location for each ground station.

18. The method of claim 12, wherein the reuse pattern is defined by distances from the center of a beam to the edge of a beam with the same color.

19. The method of claim 12, wherein the virtual channel number of the ground station passes from a satellite to a resource manager such that a footprint overlap area is less than one uplink cell.

20. The method of claim 12, wherein the virtual channel number of the ground station passes from satellite to satellite independent of phasing.

21. The method of claim 12, wherein the virtual channel number of the ground station passes from satellite to satellite independent of matching orientations.

22. The method of claim 12, wherein the ground stations are registered with a network manager that assigns the virtual channel numbers to classes of ground stations.

23. A method of coordinating communications between base stations and fixed beam satellites, the method comprising the steps of:

(a) assigning a color to each beam of an antenna on a satellite to create a color pattern, wherein the color pattern matches a frequency reuse pattern for the antenna;

(b) dividing a number of user channels allocated to the satellite into groups in relation to the number of beam colors used;

(c) allocating virtual channel numbers to base stations, wherein the virtual channel number is assigned to the base station when the same virtual channel number is not used by another base station within a beam diameter of the requesting base station; and

(d) computing uplink frequency and polarization based on the virtual channel number and satellite parameters by the base station,

wherein identical frequencies are reused in a different beam with the same color and the base station moves between beam colors over time.

24. A method of coordinating communications between ground stations and fixed beam satellites, the method comprising the steps of:

(a) assigning an indicia to each beam of an antenna on a satellite to create an indicia pattern, wherein the indicia pattern matches a frequency reuse pattern for the antenna;

(b) dividing a number of user channels allocated to the satellite into equal groups that equal the number of beam indicia within the indicia pattern;

(c) requesting a virtual channel from a resource manager;

(d) searching for available channels and sending a virtual channel number to the ground station, wherein the virtual channel number is assigned to the ground station when the same virtual channel number is not used by another ground station within a beam diameter of the requesting ground station;

(e) receiving the virtual channel number and satellite parameters; and

(f) determining an uplink frequency and polarization based on the virtual channel number and satellite parameters by the ground station,

wherein identical frequencies are reused in a different beam with the same indicia and the ground station moves between beam indicia over time.

25. The method according to claim 24, wherein the indicia is a color.

26. The method according to claim 24, wherein the indicia is a number.

27. The method according to claim 24, wherein the indicia is an alphabetic designation.