Techniques for utilization of bandwidth space assets

• US 6,606,307 B1
• Filed: 11/02/1999
• Issued: 08/12/2003
• Est. Priority Date: 03/23/1999
• Status: Expired due to Term

• Current Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Chang, Donald C. D., Chang, Ming U., Novak, John I. III, Yung, Kar W., Taormina, Frank A., Von Der Embse, Urban A., Cheng, David C.
• Primary Examiner(s): Kincaid, Lester G.
• Assistant Examiner(s): Mehrpour, Naghmeh
• Application Number:
  US09/432,439
• Time in Patent Office: 1,379 Days
• Field of Search: 370/316, 370/310, 370/315, 370/319, 370/322, 370/323, 370/320, 455/12.1, 455/427, 455/430, 455/431, 455/447, 455/448, 455/450, 455/452, 455/464, 455/13.2
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18521 Systems of inter linked satellites, i.e. inter satellite service for optical links between satellites H04B10/118

Abstract

Methods for operating a satellite constellation are disclosed that utilize spatial diversity and directional gain antennas at ground terminal locations to provide multiple data rate services on a single frequency channel. One method comprises receiving a signal at a first and second satellite in the satellite constellation from a first communications device. A communications channel at a first frequency from the first satellite is used to communicate with the first communications device. A signal from a second communications device is received only at the second satellite at the first frequency, and the second satellite is used to communicate with the second communications device at the first frequency without substantially interfering with the communications with the first communications device.

Claims

1. A method for operating a communications satellite constellation, comprising:

receiving a first signal at a first data rate at a first satellite and a second satellite in the satellite constellation from a first communications device within a region, the region being simultaneously serviced by the first satellite and the second satellite;

using a first communications channel to communicate a second signal at a second data rate different than the first data rate from the first satellite to a second communications device within the region; and

using the first communications channel to communicate a third signal at the second data rate from the second satellite to a third communications device within the region without substantially interfering with the communications with the first communications device.

2. The method of claim 1, wherein the first satellite and the second satellite are in Middle Earth Orbit (MEO).

3. The method of claim 1, wherein the signal from the second communications device comprises a higher power density than the signal from the first communications device.

4. The method of claim 1, wherein the step of using the first communications channel to communicate a third signal at the second data rate from the second satellite to a third communications device within the region without substantially interfering with the communications with the first communications device comprises the step of using a lower power density signal from the second satellite to communicate with the second communications device.

5. The method of claim 1, wherein the step of using the first communications channel to communicate a third signal at the second data rate from the second satellite to a third communications device within the region without substantially interfering with the communications with the first communications device comprises the step of using spatial diversity to communicate with the second communications device.

21. The method of claim 1, wherein the second data rate is higher than the first data rate.

6. A method for operating a satellite at an increased efficiency, comprising the steps of:

calculating the maximum number of communications signals that the satellite can generate for a first communications service;

determining an operational constraint on the satellite, the operational constraint limiting the number of communications signals that the satellite can radiate substantially simultaneously;

defining a second communications service, the second communications service using the same communications signals as the first communications service;

determining, using the operational constraint and an operational space, the increased efficiency for the communications signals, the operational space defined using the first and the second communications services;

determining a limit on the increased efficiency using the operational constraints;

determining an operational point for the satellite using the limited increased efficiency;

operating the satellite at the operational point.

7. The method of claim 6, wherein the operational point increases the use of transponder bandwidth.

8. The method of claim 6, wherein the operational constraints are selected as one or more elements selected from a group comprising power limitation, available subbands, available channels, and data rate requirements.

9. The method of claim 6, wherein the increased efficiency operational point is determined using at least one element selected from a group comprising revenue generation, bandwidth availability, available power, number of users within a region, and available subbands.

10. The method of claim 6, wherein the step of defining the second communications service includes defining a different data rate for the second communications service.

11. A method for increasing the efficiency of usage for a satellite space asset, comprising the steps of:

dynamically determining an amount of the satellite space asset that is available at a current operational point;

determining the limits of usage of the satellite space asset using operational constraints;

dynamically creating an operational space for the satellite space asset wherein the operational space is defined using the availability of the satellite space asset and the operational constraints;

determining an increased efficiency operational point for the satellite space assets within the operational space, wherein the increased efficiency operational point for the based on the limiting step; and

operating the satellite space asset at the increased efficiency operational point.

12. The method of claim 11, wherein the satellite space asset is selected from a group comprising transponder bandwidth and subbands.

13. The method of claim 11, wherein the operational constraints are selected as one or more elements selected from a group comprising power limitation, available subbands, available channels, and data rate requirements.

14. The method of claim 11, wherein the increased efficiency operational point is determined using at least one element selected from a group comprising revenue generation, bandwidth availability, available power, number of users within a region, and available subbands.

15. The method of claim 11, wherein the step of creating the operational space comprises the steps of generating a different usage for the satellite space asset and including the different usage of the satellite space asset in the creating step.

16. The method of claim 11, wherein the step of determining the increased efficiency operational point for the satellite space assets comprises the step of allocating a frequency subband of the satellite space asset to support a first application and a second application substantially simultaneously.

17. The method of claim 11, wherein the step of determining the increased efficiency operational point for the satellite space assets is determined by a region of service.

18. A method for operating a communications satellite constellation, comprising:

receiving a first signal at a first data rate at a first satellite from a first communications device within a region,

receiving a second signal at the first data rate at a second satellite in the satellite constellation from a second communications device within the region;

using a first communications channel to communicate a third signal at a second data rate higher than the first data rate from the first satellite to a third communications device; and

using the first communications channel to communicate a fourth signal at the second data rate from the second satellite to a fourth communications device within the region without substantially interfering with the communications with the first communications device, the second communications device, and the third communications device.

19. The method of claim 18, wherein the step of using the first communications channel to communicate a fourth signal at the second data rate from the second satellite to a fourth communications device within the region without substantially interfering with the communications with the first communications device, the second communications device, and the third communications device comprises the step of using spatial diversity.

20. The method of claim 18, wherein the third and fourth signals comprise a higher power density than the first and second signals.

22. A method of communicating information, comprising the steps of:

communicating a first signal from one of a plurality of satellites to one or more of a first set of communications devices disposed within a region at a first data rate using one of a first set of one or more channels;

communicating a second signal from the one of the plurality of satellites to a first of a second set of communications devices disposed within the region at a second data rate higher than the first data rate using a first of a second set of one or more channels; and

communicating a third signal from another of the plurality of satellites to a second of the second set of communications devices disposed within the region at the second data rate using the first of the second set of one or more channels.

23. The method of claim 22, wherein the first, second and third signals are communicated simultaneously.

24. The method of claim 23, wherein each of the first, second and third signals are communicated without substantially interfering with the other of the first, second, and third signals.

25. The method of claim 24, wherein the first of the second set of communications devices is spatially diverse from the second of the second set of communications devices.

26. The method of claim 24, wherein:

the first set of communications devices each include an antenna having a first beamwidth; and

the second set of communications devices each include an antenna having a second beamwidth more restricted than the first beamwidth.

27. The method of claim 24, wherein:

the first beamwidth is disposed to receive signals from more than one of the plurality of satellites; and

the second beamwidth is disposed to receive signals from only one of the plurality of satellites.

28. The method of claim 24, wherein:

the first signal is of greater signal strength than the second signal and the third signal;

the first set of communications devices each include an antenna having a first gain; and

the second set of communications devices each include an antenna having a second gain greater than the first gain.

29. A method of communicating information, comprising the steps of:

communicating a first signal having a first signal strength from one of a plurality of satellites to one or more of a first set of communications devices coupled to a first antenna having a first gain disposed within a region using one of a first set of one or more channels; and

communicating a second signal having a second signal strength less than the first signal strength from the one of the plurality of satellites to one or more of a second set of communications devices using the one of the first set of one or more channels, said one or more of the second set of communication devices each comprising a second antenna having a second gain greater than the first gain disposed within the region.

30. The method of claim 29, wherein the first signal and the second signal are communicated simultaneously.

31. The method of claim 30, wherein the second signal strength is undetectable by the first set of communications devices and detectable by the second set of communications devices.

32. The method of claim 29, further comprising the steps of:

communicating a third signal from another one of the plurality of satellites to another of the second set of communications devices disposed within the region, the another of the second set of communications devices comprising a third antenna having the second gain.

33. The method of claim 29, wherein:

the first antenna has a first beamwidth;

the second antenna has a second beamwidth more restricted than the first beamwidth.

34. The method of claim 29, wherein the plurality of satellites are in Middle Earth Orbit.