Satellite/terrestrial wireless communications systems and methods using disparate channel separation codes

• US 7,596,111 B2
• Filed: 01/27/2005
• Issued: 09/29/2009
• Est. Priority Date: 01/27/2005
• Status: Active Grant

• Current Assignee: ATC Technology Corporation (FedEx Corporation)
• Original Assignee: ATC Technology Corporation (FedEx Corporation)
• Inventors: Karabinis, Peter D.
• Primary Examiner(s): Pérez-Gutiérrez; Rafael
• Assistant Examiner(s): Arevalo; Joseph
• Application Number:
  US11/044,477
• Publication Number:
  US 20060165120A1
• Time in Patent Office: 1,706 Days
• Field of Search: 455/12.1, 455/427, 455/429, 455/11.1, 455/466, 455/13.1, 455/428, 455/515, 455/13.4, 455/3.01, 455/516, 455/456.1, 455/540, 455/447, 455/450, 370/320, 370/329, 370/465, 370/466, 370/642, 370/147, 370/322, 370/529, 370/335, 370/342, 370/337, 370/140, 370/441, 370/316, 370/319, 370/229, 370/536, 370/542, 122/12.1, 701/213
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00

Abstract

A wireless communications system includes a space-based component (SBC) and an ancillary terrestrial component (ATC) configured to communicate with radioterminals using a common satellite service link frequency band and respective first and second different sets of channel separation codes. The first and second sets of channel separation codes may include, for example, respective sets of scrambling codes, respective sets of frequency assignment codes, respective sets of channel assignment codes, respective sets of sub-channel assignment codes and/or respective sets of spreading codes.

Claims

1. A wireless communications system comprising an ancillary terrestrial component (ATC) that is associated with a space based component (SBC) and is configured to communicate with first radioterminals using first frequencies of a satellite frequency band while the SBC communicates with second radioterminals using second frequencies of the satellite frequency band, wherein the ATC is farther configured to communicate with the first radioterminals using an OFDM/OFDMA air interface protocol and a first set of channel separation codes that differs from a second set of channel separation codes that is used by the SBC to communicate with the second radioterminals and wherein the ATC uses a first controller that is autonomous and independent from a second controller that is used by the SBC.

2. A system according to claim 1, wherein the SBC and the ATC communicate with radioterminals using respective first and second different air interface protocols.

3. A system according to claim 1, wherein the first and second sets of channel separation codes comprise respective sets of scrambling codes, respective sets of frequency assignment codes, respective sets of channel assignment codes, respective sets of sub-channel assignment codes and/or respective sets of spreading codes.

4. A system according to claim 1, wherein the first and second sets of channel separation codes comprise respective different sets of spreading codes, respective different sets of frequency assignment codes, respective different sets of channel assignment codes and/or respective different sets of sub-channel assignment codes.

5. A system according to claim 1, wherein the first and second sets of channel separation codes comprise respective different sets of Walsh codes, respective different sets of OFDM/OFDMA frequency assignment codes, respective different sets of OFDM/OFDMA channel assignment codes and/or respective different sets of OFDM/OFDMA sub-channel assignment codes.

6. A system according to claim 1, wherein the first and second sets of channel separation codes comprise respective different first and second sets of code phases of the same code.

7. A system according to claim 6, wherein the first and/or second sets of code phases are functions of first and/or second radioterminal identifiers.

8. A system according to claim 1, wherein the first and second sets of channel separation codes comprise respective first and second sets of long codes and/or short codes.

9. A system according to claim 1, wherein the SBC and the ATC employ the same chip rate, wherein the SBC employs a symbol period that is an integer multiple of a symbol period used by the ATC, wherein the first set of channel separation codes comprises a first set of spreading codes having a first length, wherein the second set of channel separation codes comprises a second set of spreading codes having a second length, and wherein the second length is an integer multiple of the first length.

10. A system according to claim 1, wherein the first and/or second sets of channel separation codes are functions of at least one radioterminal identifier.

11. A system according to claim 1, wherein the SBC and/or the ATC are operative to generate the respective first and second sets of channel separation codes responsive to at least one radioterminal identifier.

12. A system according to claim 1 wherein the SBC is configured to communicate with radioterminals using a FDD air interface protocol and wherein the ATC is configured to communicate with the radiotenninals using a TDD air interface protocol.

13. A system according to claim 12 wherein the TDD and/or the FDD air interface protocol is an OFDM and/or OFDMA air interface protocol.

14. A system according to claim 1, wherein the SBC communicates with radioterminals using a first sub-band of the satellite frequency band, and wherein the ATC communicates with the radioterminals using a second sub-band of the satellite frequency band.

15. A system according to claim 14, wherein the first and second sub-bands do not overlap.

16. A system according to claim 14, wherein the first and second sub-bands at least partially overlap.

17. A method of operating a wireless communications system comprising an ancillary terrestrial component (ATC) that is associated with a space based component (SBC), the method comprising:

communicating between the ATC and first radioterminals using an OFDM/OFDMA air interface protocol and first frequencies of a satellite frequency band while the SBC communicates with second radioterminals using second frequencies of the satellite frequency band;

communicating between the ATC and the first radioterminals using a first set of channel separation codes that differs from a second set of channel separation codes that is used by the SBC to communicate with the second radioterminals; and

using by the ATC a first controller that is autonomous and independent from a second controller that is used by the SBC.

18. A method according to claim 17:

wherein communicating between the ATC and the first radiotenninals using a first set of channel separation codes that differs from a second set of channel separation codes that is used by the SBC to communicate with the second radioterminals comprises communicating between the first radioterminals and the ATC using an air interface protocol that is different from an air interface protocol that is used by the second radioterminals to communicate with the SBC.

19. A method according to claim 17, wherein the first and second sets of channel separation codes comprise respective sets of scrambling codes, respective sets of frequency assignment codes, respective sets of channel assignment codes, respective sets of sub-channel assignment codes and/or respective sets of spreading codes.

20. A method according to claim 17, wherein the first and second sets of channel separation codes comprise respective different sets of spreading codes, respective different sets of frequency assignment codes, respective different sets of channel assignment codes, and/or respective different sets of sub-channel assignment codes.

21. A method according to claim 17, wherein the first and second sets of channel separation codes comprise respective different sets of Walsh codes, respective different sets of OFDM/OFDIVIA frequency assignment codes, respective different sets of channel assignment codes, and/or respective different sets of sub-channel assignment codes.

22. A method according to claim 17, wherein the first and second sets of channel separation codes comprise respective different first and second sets of code phases of the same code.

23. A method according to claim 22, wherein the first and/or second sets of code phases are functions of first and/or second radioterminal identifiers.

24. A method according to claim 17, wherein the first and second sets of channel separation codes comprise respective first and second sets of long codes and/or short codes.

25. A method according to claim 17, further comprising using the same chip rate for communications between the SBC and the second radioterminals and for communications between the ATC and the first radioterminals, wherein communications between the second radioterminals and the SBC employ a symbol period that is an integer multiple of a symbol period used for communications between the first radioterminals and the ATC, wherein the first set of channel separation codes comprises a first set of spreading codes having a first length, wherein the second set of channel separation codes comprises a second set of spreading codes having a second length, and wherein the second length is an integer multiple of the first length.

26. A method according to claim 17, further comprising generating and/or selecting codes from the first and/or second sets of channel separation codes responsive to at least one radioterminal identifier.

27. A method according to claim 17:

wherein communicating between the ATC and first radioterminals using first frequencies of a satellite frequency band while the SBC communicates with second radioterminals using second frequencies of the satellite frequency band comprises the ATC using a first sub-band of the of the satellite frequency band while the SBC is using a second sub-band of the satellite frequency band.

28. A method according to claim 27, wherein the first and second sub-bands do not overlap.

29. A method according to claim 25, wherein the first and second sub-bands at least partially overlap.

30. A radioterminal comprising:

a radio transceiver configured to communicate with a space-based component (SBC) of a mobile satellite communications system using first frequencies of a satellite frequency band and to communicate with an ancillary terrestrial component (ATC) of the mobile satellite communications system using second frequencies of the satellite frequency band, wherein the radio transceiver is further configured to use an OFDM/OFDMA air interface protocol to communicate with the ATC and respective different first and second channel separation codes to communicate with the SBC and the ATC and wherein the SBC and the ATC use respective first and second controllers that are configured to operate autonomously and independently therebetween.

31. A radioterminal according to claim 30, wherein the radio transceiver is further configured to communicate with the SBC using a first air interface protocol and to communicate with the ATC using a second air interface protocol that is different than the first air interface protocol.

32. A radioterminal according to claim 30, wherein the first and second channel separation codes comprise respective scrambling codes, respective frequency assignment codes, respective channel assignment codes, respective sub-channel assignment codes and/or respective spreading codes.

33. A radioterminal according to claim 30, wherein the first and second channel separation codes comprise respective different spreading codes, respective different frequency assignment codes, respective different channel assignment codes and/or respective different sub-channel assignment codes.

34. A radioterminal according to claim 30, wherein the first and second channel separation codes comprise respective different Walsh codes, respective different OFDM/OFDMA frequency assignment codes, respective different OFDM/OFDMA channel assignment codes, and/or respective different OFDM/OFDMA sub-channel assignment codes.

35. A radioterminal according to claim 30, wherein the first and second channel separation codes comprise respective first and second code phases of the same code.

36. A radioterminal according to claim 35, comprising a code generator configured to generate a code responsive to first and/or second identifiers for the radioterminal.

37. A radioterminal according to claim 30, wherein the radio transceiver uses the same chip rate when communicating with the SBC and the ATC, wherein the radio transceiver employs a symbol period when communicating with the SBC that is an integer multiple of a symbol period used when the radioterminal is communicating with the ATC, wherein the first channel separation code comprises a first spreading code having a first length, wherein the second channel separation code comprises a second spreading code having a second length, and wherein the first length is an integer multiple of the second length.

38. A radioterminal according to claim 30, wherein the first and/or second channel separation codes are functions of at least one radioterininal identifier.

39. A radioterminal according to claim 30, wherein the radioterminal is operative to generate and/or select a code responsive to at least one radioterminal identifier.

40. A radioterminal according to claim 30, wherein the radioterrninal is configured to communicate with the ATC using a TDD air interface protocol and wherein the radioterminal is further configured to communicate with the SBC using a FDD air interface protocol.

41. A radioterminal according to claim 40, wherein the TDD and/or the FDD air interface protocol is an OFDM and/or an OFDMA air interface protocol.

42. A radioterminal according to claim 30, wherein the radioterminal communicates with the SBC using a first sub-band of a satellite service link frequency band, and wherein the radioterminal communicates with the ATC using a second sub-band of the satellite service link frequency band.

43. A space-based component (SBC) of a wireless communications system, the SBC configured to communicate with first radioterminals using first frequencies of a satellite frequency band, second frequencies of which are used by an ancillary terrestrial component (ATC) to communicate with second radioterminals using an OFDM/OFDMA air interface protocol, the SBC using a first set of channel separation codes to communicate with the first radioterminals that is different than a second set of channel separation codes used by the ATC to communicate with the second radioterminals, and wherein the SBC and the ATC use respective first and second controllers that are configured to operate autonomously and independently therebetween.

44. An SBC according to claim 43, wherein the SBC is configured to communicate with radiotenninals using a first air interface protocol that is different than a second air interface protocol used by the ATC.

45. An SBC according to claim 43, wherein the first and second sets of channel separation codes comprise respective sets of scrambling codes, respective sets of frequency assignment codes, respective sets of channel assignment codes, respective sets of sub-channel assigmnent codes and/or respective sets of spreading codes.

46. An SBC according to claim 43, wherein the first and second sets of channel separation codes comprise respective different sets of spreading codes, respective different sets of frequency assignment codes, respective different sets of channel assignment codes, and/or respective different sets of sub-channel assignment codes.

47. An SBC according to claim 43, wherein the first and second sets of channel separation codes comprise respective different sets of Walsh codes, respective different sets of OFDM/OFDMA frequency assignment codes, respective different sets of OFDM/OFDMA channel assignment codes and/or respective different sets of OFDM/OFDMA sub-channel assignment codes.

48. An SBC according to claim 43, wherein the first and second sets of channel separation codes comprise respective different first and second sets of code phases of the same code.

49. An SBC according to claim 48, wherein the first and/or second sets of code phases are functions of first and/or second radioterminal identifiers.

50. An SBC according to claim 43, wherein the first and second sets of channel separation codes comprise respective first and second sets of long codes, frequency, channel and/or sub-channel assignment codes and/or short codes.

51. An SBC according to claim 43, wherein the SBC and the ATC employ the same chip rate, wherein the SBC employs a symbol period that is an integer multiple of a symbol period used by the ATC, wherein the first set of channel separation codes comprises a first set of spreading codes having a first length, wherein the second set of channel separation codes comprises a second set of spreading codes having a second length, and wherein the first length is an integer multiple of the second length.

52. An SBC according to claim 43, wherein the first set of channel separation codes are functions of at least one radioterminal identifier.

53. An SBC according to claim 43, wherein the SBC is operative to generate the first set of channel separation codes responsive to at least one radioterminal identifier.