SYSTEMS AND METHODS FOR RANGE EXTENSION OF WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS

• US 20120263107A1
• Filed: 04/13/2012
• Published: 10/18/2012
• Est. Priority Date: 04/15/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Taghavi Nasrabadi, Mohammad Hossein, Sampath, Hemanth, Jones, Vincent K. IV
• Granted Patent: US 9,191,923 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal

Abstract

Systems, methods, and devices to enable range extension for wireless communication in sub-gigahertz bands are described herein. In some aspects, portions of packets are repeated in time and/or space when transmitting the packet in order to increase the chance that the packet can be decoded. The repetition of portions of the packet may be based, in part, on the channel characteristics of the channel over which the packet is sent. In some aspects, portions of packets are transmitted over a smaller bandwidth with increased power per frequency range.

Claims

1. A method for wireless communication, the method comprising:

determining information identifying a characteristic of a communication channel;

modifying a number of times to repeat a training sequence based on the determined information; and

transmitting a physical packet comprising the training sequence repeated the modified number of times and a data portion.

2. The method of claim 1, wherein the training sequence is repeated in the time-domain.

3. The method of claim 1, wherein the training sequence is repeated in the frequency-domain.

4. The method of claim 3, wherein the training sequence is repeated over a contiguous frequency range.

5. The method of claim 3, wherein the training sequence is repeated over a non-contiguous frequency range.

6. The method of claim 1, wherein the training sequence is repeated in the time-domain and the frequency-domain.

7. The method of claim 1, wherein the data portion is repeated based on the determined information.

8. The method of claim 1, wherein a coding rate of the physical packet is adjusted based on the determined information.

9. The method of claim 1, wherein the training sequence comprises a short training field.

10. The method of claim 1, wherein the training sequence comprises a long training field.

11. The method of claim 1, further comprising modifying a number of times to repeat a signal field based on the determined information, wherein the physical packet comprises the signal field.

12. A method for wireless communication, the method comprising:

receiving a physical packet comprising a plurality of sets of repeated training sequences and a data portion, each of the sets of repeated training sequences comprising a plurality of repeated training sequences; and

determining the number of times the sets of training sequences are repeated.

13. The method of claim 12, wherein the plurality of sets of training sequences are repeated in the time-domain.

14. The method of claim 12, wherein the plurality of sets of training sequences are repeated in the frequency-domain.

15. The method of claim 14, wherein the plurality of sets of training sequences are repeated over a contiguous frequency range.

16. The method of claim 14, wherein the plurality of sets of training sequences are repeated over a non-contiguous frequency range.

17. The method of claim 12, wherein the plurality of sets of training sequences are repeated in the time-domain and the frequency-domain.

18. The method of claim 12, wherein the plurality of sets of training sequences comprise short training fields.

19. The method of claim 12, further comprising determining a number of times a signal field, long training field, and/or the data portion is repeated based on the determined number of times the sets of training sequences are repeated.

20. The method of claim 12, further comprising determining a frequency range over which the physical packet is received based on the determined number of times the sets of training sequences are repeated.

21. The method of claim 12, further comprising transmitting a request to a wireless device that transmitted the packet, the request indicating the wireless device should repeat portions of packets transmitted.

22. The method of claim 21, wherein transmitting the request is based on determination of a channel characteristic of a channel over which the physical packet is received.

23. The method of claim 12, wherein determining the number of times the sets of training sequences are repeated comprises comparing a correlation property of the received training sequence over multiple time segments and/or frequency ranges.

24. An apparatus for wireless communication, the apparatus comprising:

a processor configured to;

determine information identifying a characteristic of a communication channel; and

modify a number of times to repeat a training sequence based on the determined information; and

a transmitter configured to transmit a physical packet comprising the training sequence repeated the modified number of times and a data portion.

25. The apparatus of claim 24, wherein the training sequence is repeated in the time-domain.

26. The apparatus of claim 24, wherein the training sequence is repeated in the frequency-domain.

27. The apparatus of claim 26, wherein the training sequence is repeated over a contiguous frequency range.

28. The apparatus of claim 26, wherein the training sequence is repeated over a non-contiguous frequency range.

29. The apparatus of claim 24, wherein the training sequence is repeated in the time-domain and the frequency-domain.

30. The apparatus of claim 24, wherein the data portion is repeated based on the determined information.

31. The apparatus of claim 24, wherein a coding rate of the physical packet is adjusted based on the determined information.

32. The apparatus of claim 24, wherein the training sequence comprises a short training field.

33. The apparatus of claim 24, wherein the training sequence comprises a long training field.

34. The apparatus of claim 24, wherein the processor is further configured to modify a number of times to repeat a signal field based on the determined information, wherein the physical packet comprises the signal field.

35. An apparatus for wireless communication, the apparatus comprising:

a receiver configured to receive a physical packet comprising a plurality of sets of repeated training sequences and a data portion, each of the sets of repeated training sequences comprising a plurality of repeated training sequences; and

a processor configured to determine the number of times the sets of training sequences are repeated.

36. The apparatus of claim 35, wherein the plurality of sets of training sequences are repeated in the time-domain.

37. The apparatus of claim 35, wherein the plurality of sets of training sequences are repeated in the frequency-domain.

40. The apparatus of claim 35, wherein the plurality of sets of training sequences are repeated in the time-domain and the frequency-domain.

41. The apparatus of claim 35, wherein the plurality of sets of training sequences comprise short training fields.

42. The apparatus of claim 35, wherein the processor is further configured to determine a number of times a signal field, long training field, and/or the data portion is repeated based on the determined number of times the sets of training sequences are repeated.

43. The apparatus of claim 35, wherein the processor is further configured to determine a frequency range over which the physical packet is received based on the determined number of times the sets of training sequences are repeated.

44. The apparatus of claim 35, further comprising a transmitter configured to transmit a request to a wireless device that transmitted the packet, the request indicating the wireless device should repeat portions of packets transmitted.

45. The apparatus of claim 44, wherein transmitting the request is based on determination of a channel characteristic of a channel over which the physical packet is received.

46. The apparatus of claim 35, wherein determining the number of times the sets of training sequences are repeated comprises comparing a correlation property of the received training sequence over multiple time segments and/or frequency ranges.

38. The apparatus of claim 38, wherein the plurality of sets of training sequences are repeated over a contiguous frequency range.

39. The apparatus of claim 38, wherein the plurality of sets of training sequences are repeated over a non-contiguous frequency range.

47. An apparatus for wireless communication, the apparatus comprising:

means for determining information identifying a characteristic of a communication channel;

means for modifying a number of times to repeat a training sequence based on the determined information; and

means for transmitting a physical packet comprising the training sequence repeated the modified number of times and a data portion.

48. The apparatus of claim 47, wherein the training sequence is repeated in the time-domain.

49. The apparatus of claim 47, wherein the training sequence is repeated in the frequency-domain.

50. The apparatus of claim 49, wherein the training sequence is repeated over a contiguous frequency range.

51. The apparatus of claim 49, wherein the training sequence is repeated over a non-contiguous frequency range.

52. The apparatus of claim 47, wherein the training sequence is repeated in the time-domain and the frequency-domain.

53. The apparatus of claim 47, wherein the data portion is repeated based on the determined information.

54. The apparatus of claim 47, wherein a coding rate of the physical packet is adjusted based on the determined information.

55. The apparatus of claim 47, wherein the training sequence comprises a short training field.

56. The apparatus of claim 47, wherein the training sequence comprises a long training field.

57. The apparatus of claim 47, further comprising means for modifying a number of times to repeat a signal field based on the determined information, wherein the physical packet comprises the signal field.

58. An apparatus for wireless communication, the apparatus comprising:

means for receiving a physical packet comprising a plurality of sets of repeated training sequences and a data portion, each of the sets of repeated training sequences comprising a plurality of repeated training sequences; and

means for determining the number of times the sets of training sequences are repeated.

59. The apparatus of claim 58, wherein the plurality of sets of training sequences are repeated in the time-domain.

60. The apparatus of claim 58, wherein the plurality of sets of training sequences are repeated in the frequency-domain.

61. The apparatus of claim 60, wherein the plurality of sets of training sequences are repeated over a contiguous frequency range.

62. The apparatus of claim 60, wherein the plurality of sets of training sequences are repeated over a non-contiguous frequency range.

63. The apparatus of claim 58, wherein the plurality of sets of training sequences are repeated in the time-domain and the frequency-domain.

64. The apparatus of claim 58, wherein the plurality of sets of training sequences comprise short training fields.

65. The apparatus of claim 58, further comprising means for determining a number of times a signal field, long training field, and/or the data portion is repeated based on the determined number of times the sets of training sequences are repeated.

66. The apparatus of claim 58, further comprising means for determining a frequency range over which the physical packet is received based on the determined number of times the sets of training sequences are repeated.

67. The apparatus of claim 58, further comprising means for transmitting a request to a wireless device that transmitted the packet, the request indicating the wireless device should repeat portions of packets transmitted.

68. The apparatus of claim 67, wherein transmitting the request is based on determination of a channel characteristic of a channel over which the physical packet is received.

69. The apparatus of claim 58, wherein determining the number of times the sets of training sequences are repeated comprises comparing a correlation property of the received training sequence over multiple time segments and/or frequency ranges.

70. A computer readable medium comprising instructions that when executed cause an apparatus to perform a method of wireless communication, the method comprising:

determining information identifying a characteristic of a communication channel;

modifying a number of times to repeat a training sequence based on the determined information; and

transmitting a physical packet comprising the training sequence repeated the modified number of times and a data portion.

71. The computer readable medium of claim 70, wherein the training sequence is repeated in the time-domain.

72. The computer readable medium of claim 70, wherein the training sequence is repeated in the frequency-domain.

73. The computer readable medium of claim 72, wherein the training sequence is repeated over a contiguous frequency range.

74. The computer readable medium of claim 72, wherein the training sequence is repeated over a non-contiguous frequency range.

75. The computer readable medium of claim 70, wherein the training sequence is repeated in the time-domain and the frequency-domain.

76. The computer readable medium of claim 70, wherein the data portion is repeated based on the determined information.

77. The computer readable medium of claim 70, wherein a coding rate of the physical packet is adjusted based on the determined information.

78. The computer readable medium of claim 70, wherein the training sequence comprises a short training field.

79. The computer readable medium of claim 70, wherein the training sequence comprises a long training field.

80. The computer readable medium of claim 70, wherein the method further comprises modifying a number of times to repeat a signal field based on the determined information, wherein the physical packet comprises the signal field.

81. A computer readable medium comprising instructions that when executed cause an apparatus to perform a method of wireless communication, the method comprising:

receiving a physical packet comprising a plurality of sets of repeated training sequences and a data portion, each of the sets of repeated training sequences comprising a plurality of repeated training sequences; and

determining the number of times the sets of training sequences are repeated.

82. The computer readable medium of claim 81, wherein the plurality of sets of training sequences are repeated in the time-domain.

83. The computer readable medium of claim 81, wherein the plurality of sets of training sequences are repeated in the frequency-domain.

84. The computer readable medium of claim 83, wherein the plurality of sets of training sequences are repeated over a contiguous frequency range.

85. The computer readable medium of claim 83, wherein the plurality of sets of training sequences are repeated over a non-contiguous frequency range.

86. The computer readable medium of claim 81, wherein the plurality of sets of training sequences are repeated in the time-domain and the frequency-domain.

87. The computer readable medium of claim 81, wherein the plurality of sets of training sequences comprise short training fields.

88. The computer readable medium of claim 81, wherein the method further comprises determining a number of times a signal field, long training field, and/or the data portion is repeated based on the determined number of times the sets of training sequences are repeated.

89. The computer readable medium of claim 81, wherein the method further comprises determining a frequency range over which the physical packet is received based on the determined number of times the sets of training sequences are repeated.

90. The computer readable medium of claim 81, wherein the method further comprises transmitting a request to a wireless device that transmitted the packet, the request indicating the wireless device should repeat portions of packets transmitted.

92. The computer readable medium of claim 81, wherein determining the number of times the sets of training sequences are repeated comprises comparing a correlation property of the received training sequence over multiple time segments and/or frequency ranges.

91. The computer readable medium of claim 91, wherein transmitting the request is based on determination of a channel characteristic of a channel over which the physical packet is received.