Scheduling with reverse direction grant in wireless communication systems

• US 9,198,194 B2
• Filed: 04/05/2012
• Issued: 11/24/2015
• Est. Priority Date: 09/12/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Meylan, Arnaud, Nanda, Sanjiv
• Primary Examiner(s): Karikari, Kwasi
• Application Number:
  US13/440,666
• Publication Number:
  US 20120188973A1
• Time in Patent Office: 1,328 Days
• Field of Search: 455/343.2, 455/41.2, 455/507, 370/338
• US Class Current: 1/1
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/06 using polling

Abstract

Systems and methodologies are described that facilitate increased communication channel bandwidth efficiency in association with scheduled time periods that allocate channel access to particular stations. According to various aspects, systems and methods are described that facilitate providing and/or utilizing reverse direction grants in connection with scheduled channel access. Such systems and/or method can mitigate an amount of unused channel access time after a station completes data transmission prior to an end of the allocated period.

Claims

1. A method comprising:

receiving, by a receiver device, data communicated from a transmitter station during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

receiving a reverse direction grant, from the transmitter station by the receiver device, during the particular transmission opportunity in the first direction; and

transmitting data in a second direction from the receiver device to the transmitter station during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant.

2. The method of claim 1, further comprising:

identifying a time at which the receiver device is scheduled to perform at least one of receive and transmit data via a communication channel.

3. The method of claim 1, wherein transmitting the data in the second direction from the receiver device to the transmitter station in response to the evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant comprises:

evaluating at the receiver device whether to employ the received reverse direction grant during at least a portion of a remainder of a scheduled time period associated with the particular transmission opportunity.

4. The method of claim 3, wherein evaluating whether to the employ the received reverse direction grant comprises:

evaluating at least one of an amount of time remaining in the scheduled time period and an amount of data to be transmitted in the second direction upon obtaining channel access.

5. The method of claim 1, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

6. The method of claim 5, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the receiver device.

7. The method of claim 6, wherein the scheduler comprises an access point.

8. The method of claim 5, the multi-poll frame schedule is a SCHED frame.

9. The method of claim 1, wherein the receiver device includes a user terminal and the transmitter station includes another user terminal.

10. The method of claim 1, wherein the receiver device includes an access point and the transmitter station includes a transmitter user terminal.

11. The method of claim 1, wherein the receiver device includes a receiver user terminal and the transmitter station includes an access point.

12. The method of claim 1, wherein the reverse direction grant is indicated with one bit.

13. The method of claim 1, further comprising:

receiving by the receiver device three bits of data from the transmitter station to indicate the quality of service (QoS) class of the reverse direction grant.

14. An apparatus to facilitate utilizing a reverse direction grant in a wireless communication system, the apparatus comprising:

a memory to store information associated with at least one transmission opportunity related to access of a channel, the information received in a multi-poll frame schedule; and

a processor, coupled to the memory, configured to;

receive data communicated from a transmitter station during a particular transmission opportunity in a first direction according to the multi-poll frame schedule;

receive the reverse direction grant, from the transmitter station, during the particular transmission opportunity in the first direction; and

transmit data in a second direction to the transmitter station during the particular transmission opportunity in response to an evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant.

15. The apparatus of claim 14, wherein the processor is further configured to:

identify a time at which the apparatus is scheduled to perform at least one of receive and transmit data via the channel.

16. The apparatus of claim 14, wherein the processor configured to transmit the data in the second direction to the transmitter station in response to the evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant is configured to:

evaluate whether to employ the received reverse direction grant during at least a portion of a remainder of a scheduled time period associated with the particular transmission opportunity.

17. The apparatus of claim 14, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

18. The apparatus of claim 17, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the apparatus.

19. The apparatus of claim 18, wherein the scheduler comprises an access point.

21. The apparatus of claim 14, wherein the apparatus includes an access point and the transmitter station includes a transmitter user terminal.

22. The apparatus of claim 14, wherein the apparatus includes a receiver user terminal and the transmitter station includes an access point.

23. The apparatus of claim 14, wherein the reverse direction grant is indicated with one bit.

24. The apparatus of claim 14, wherein the processor is further configured to:

receive three bits of data from the transmitter station to indicate the quality of service (QoS) class of the reverse direction grant.

20. The apparatus of 14, wherein the apparatus includes a user terminal and the transmitter station includes another user terminal.

25. A wireless communication apparatus, comprising:

means for receiving data communicated from a transmitter station during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

means for receiving a reverse direction grant, from the transmitter station, during the particular transmission opportunity in the first direction; and

means for transmitting data in a second direction to the transmitter station during the particular transmission opportunity in response to an evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant.

26. The apparatus of claim 25, further comprising:

means for identifying a time at which the apparatus is scheduled to perform at least one of receive and transmit data via the channel.

27. The apparatus of claim 25, wherein the means for transmitting the data in the second direction to the transmitter station in response to the evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant comprise:

means for evaluating whether to employ the received reverse direction grant during at least a portion of a remainder of a scheduled time period associated with the particular transmission opportunity.

28. The apparatus of claim 25, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

29. The apparatus of claim 28, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the apparatus.

30. The apparatus of claim 29, wherein the scheduler comprises an access point.

32. The apparatus of claim 25, wherein the apparatus includes an access point and the transmitter station includes a transmitter user terminal.

33. The apparatus of claim 25, wherein the apparatus includes a receiver user terminal and the transmitter station includes an access point.

34. The apparatus of claim 25, wherein the reverse direction grant is indicated with one bit.

35. The apparatus of claim 25, further comprising:

means for receiving three bits of data from the transmitter station to indicate the quality of service (QoS) class of the reverse direction grant.

31. The apparatus of 25, wherein the apparatus includes a user terminal and the transmitter station includes another user terminal.

36. A non-transitory computer-readable medium with computer-executable instructions stored thereon for:

receiving, by a receiver device, data communicated from a transmitter station during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

receiving a reverse direction grant, from the transmitter station by the receiver device, during the particular transmission opportunity in the first direction; and

transmitting data in a second direction from the receiver device to the transmitter station during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant.

37. The computer-readable medium of claim 36, wherein the computer-executable instructions comprise instructions for:

identifying a time at which the receiver device is scheduled to perform at least one of receive and transmit data via a communication channel.

38. The computer-readable medium of claim 36, wherein the computer instructions for transmitting the data in the second direction from the receiver device to the transmitter station in response to the evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the received reverse direction grant comprise instructions for:

evaluating at the receiver device whether to employ the received reverse direction grant during at least a portion of a remainder of a scheduled time period associated with the particular transmission opportunity.

39. The computer-readable medium of claim 36, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

40. The computer-readable medium of claim 36, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the receiver device.

41. The computer-readable medium of claim 40, wherein the scheduler comprises an access point.

42. The computer-readable medium of claim 36, wherein the receiver device includes a user terminal and the transmitter station includes another user terminal.

43. The computer-readable medium of claim 36, wherein the receiver device includes an access point and the transmitter station includes a transmitter user terminal.

44. The computer-readable medium of claim 36, wherein the receiver device includes a receiver user terminal and the transmitter station includes an access point.

45. The computer-readable medium of claim 36, wherein the reverse direction grant is indicated with one bit.

46. The computer-readable medium of claim 36, wherein the computer-executable instructions comprise instructions for:

receiving by the receiver device three bits of data from the transmitter station to indicate the quality of service (QoS) class of the reverse direction grant.

47. A method comprising:

transmitting data from a transmitter station to a receiver device during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

transmitting a reverse direction grant, by the transmitter station to the receiver device, during the particular transmission opportunity in the first direction; and

receiving data in a second direction by the transmitter station from the receiver device during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the transmitted reverse direction grant.

48. The method of claim 47, further comprising:

evaluating whether to transmit the reverse direction grant.

49. The method of claim 48, wherein evaluating whether to transmit the reverse direction grant comprises:

determining an amount of time remaining in a scheduled time period associated with the particular transmission opportunity.

50. The method of claim 47, further comprising:

determining, based on the multi-poll frame schedule, whether the transmitter station completed an associated transmission.

51. The method of claim 47, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

52. The method of claim 47, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the receiver device.

53. The method of claim 47, wherein the receiver device includes a user terminal and the transmitter station includes another user terminal.

54. The method of claim 47, wherein the receiver device includes an access point and the transmitter station includes a transmitter user terminal.

55. The method of claim 47, wherein the receiver device includes a receiver user terminal and the transmitter station includes an access point.

56. The method of claim 47, wherein the reverse direction grant is indicated with one bit.

57. The method of claim 47, further comprising:

transmitting by the transmitter station to the receiver device three bits of data to indicate the quality of service (QoS) class of the reverse direction grant.

58. An apparatus to facilitate utilizing reverse direction grants in a wireless communication system, the apparatus comprising:

a memory to store information associated with at least one transmission opportunity related to access of a channel, the information received in a multi-poll frame schedule; and

a processor, coupled to the memory, configured to;

transmit data to a receiver device during a particular transmission opportunity in a first direction according to the multi-poll frame schedule;

transmit a reverse direction grant during the particular transmission opportunity in the first direction; and

receiving data in a second direction from the receiver device during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the transmitted reverse direction grant.

59. The apparatus of claim 58, wherein the processor is further configured to:

evaluate whether to transmit the reverse direction grant.

60. The apparatus of claim 59, wherein the processor configured to evaluate whether to transmit the reverse direction grant is configured to:

determine an amount of time remaining in a scheduled time period associated with the particular transmission opportunity.

61. The apparatus of claim 58, wherein the processor is further configured to:

determine, based on the multi-poll frame schedule, whether an associated transmission has been completed.

62. The apparatus of claim 58, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

63. The apparatus of claim 58, wherein the multi-poll frame schedule is transmitted from a scheduler to the apparatus and to the receiver device.

64. The apparatus of claim 58, wherein the receiver device includes a user terminal and the apparatus includes another user terminal.

65. The apparatus of claim 58, wherein the receiver device includes an access point and the apparatus includes a transmitter user terminal.

66. The apparatus of claim 58, wherein the receiver device includes a receiver user terminal and the apparatus includes an access point.

67. The apparatus of claim 58, wherein the reverse direction grant is indicated with one bit.

68. The apparatus of claim 58, wherein the processor is further configured to:

transmit to the receiver device three bits of data to indicate the quality of service (QoS) class of the reverse direction grant.

69. A wireless communication apparatus, comprising:

means for transmitting data to a receiver device during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

means for transmitting a reverse direction grant during the particular transmission opportunity in the first direction; and

means for receiving data in a second direction from the receiver device during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the transmitted reverse direction grant.

70. The apparatus of claim 69, further comprising:

means for evaluating whether to transmit the reverse direction grant.

71. The apparatus of claim 70, wherein the means for evaluating whether to transmit the reverse direction grant comprise:

means for determining an amount of time remaining in a scheduled time period associated with the particular transmission opportunity.

72. The apparatus of claim 69, further comprising:

means for determining, based on the multi-poll frame schedule, whether an associated transmission has been completed.

73. The apparatus of claim 69, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

74. The apparatus of claim 69, wherein the multi-poll frame schedule is transmitted from a scheduler to the apparatus and to the receiver device.

75. The apparatus of claim 69, wherein the receiver device includes a user terminal and the apparatus includes another user terminal.

76. The apparatus of claim 69, wherein the receiver device includes an access point and the apparatus includes a transmitter user terminal.

77. The apparatus of claim 69, wherein the receiver device includes a receiver user terminal and the apparatus includes an access point.

78. The apparatus of claim 69, wherein the reverse direction grant is indicated with one bit.

79. The apparatus of claim 69, further comprising:

means for transmitting to the receiver device three bits of data to indicate the quality of service (QoS) class of the reverse direction grant.

80. A non-transitory computer-readable medium with computer-executable instructions stored thereon for:

transmitting data from a transmitter station to a receiver device during a particular transmission opportunity in a first direction according to a multi-poll frame schedule;

transmitting a reverse direction grant, by the transmitter station to the receiver device, during the particular transmission opportunity in the first direction; and

receiving data in a second direction by the transmitter station from the receiver device during the particular transmission opportunity in response to an evaluation at the receiver device, based at least in part on the multi-poll frame schedule, of whether to use the transmitted reverse direction grant.

81. The computer-readable medium of claim 80, wherein the computer instructions further comprise computer instructions for:

evaluating whether to transmit the reverse direction grant.

82. The computer-readable medium of claim 81, wherein the computer instructions for evaluating whether to transmit the reverse direction grant comprise computer instructions for:

determining an amount of time remaining in a scheduled time period associated with the particular transmission opportunity.

83. The computer-readable medium of claim 80, wherein the computer instructions further comprise computer instructions for:

determining, based on the multi-poll frame schedule, whether the transmitter station completed an associated transmission.

84. The computer-readable medium of claim 80, wherein the multi-poll frame schedule includes, for each of a number of time periods, information associated with a corresponding transmission opportunity, the information including at least one of:

a corresponding transmitter station identity, a corresponding receiver device identity, a corresponding start time, and a corresponding duration.

85. The computer-readable medium of claim 80, wherein the multi-poll frame schedule is transmitted from a scheduler to the transmitter station and to the receiver device.

86. The computer-readable medium of claim 80, wherein the receiver device includes a user terminal and the transmitter station includes another user terminal.

87. The computer-readable medium of claim 80, wherein the receiver device includes an access point and the transmitter station includes a transmitter user terminal.

88. The computer-readable medium of claim 80, wherein the receiver device includes a receiver user terminal and the transmitter station includes an access point.

89. The computer-readable medium of claim 80, wherein the reverse direction grant is indicated with one bit.

90. The computer-readable medium of claim 80, wherein the computer instructions further comprise computer instructions for:

transmitting by the transmitter station to the receiver device three bits of data to indicate the quality of service (QoS) class of the reverse direction grant.

91. An apparatus comprising:

a memory to store information associated with at least one transmission opportunity related to access of a channel, the information received in a multi-poll frame schedule; and

a processor, coupled to the memory, configured to;

receive a reverse direction grant, from a station, during a transmission opportunity,

utilize the received reverse direction grant in response to an evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the reverse direction grant to alter the apparatus from receiving data during a current transmission opportunity to transmitting data during the current transmission opportunity.

92. The apparatus of claim 91, wherein the processor configured to utilize the received reverse direction grant in response to the evaluation at the apparatus, based at least in part on the multi-poll frame schedule, of whether to use the reverse direction grant to alter the apparatus is further configured to:

determine whether to employ the reverse direction grant to alter the apparatus from receiving data to transmitting data based, at least in part, on one or more of an amount of time remaining in the current transmission opportunity and an amount of data to be transmitted by the apparatus.

93. The apparatus of claim 91, wherein the processor is further configured to:

cause transmission of data from the apparatus to the station via employing the received reverse direction grant.