Scheduling assignment content and transmission in wireless communications

• US 10,524,282 B2
• Filed: 01/29/2015
• Issued: 12/31/2019
• Est. Priority Date: 03/19/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tavildar, Saurabha Rangrao, Baghel, Sudhir Kumar, Patil, Shailesh, Gulati, Kapil
• Primary Examiner(s): Crutchfield, Christopher M
• Application Number:
  US14/608,851
• Publication Number:
  US 20150271840A1
• Time in Patent Office: 1,797 Days
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1893 Physical mapping arrangements physical resource mapping in general H04L5/00
• CPC Class Codes: H04W 28/021 in wireless networks with changing topologies, e.g. ad-hoc networks self-organizing networks H04W84/18
• CPC Class Codes: H04W 72/1263 Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Methods, systems, and devices are described for transmissions and retransmissions of scheduling assignment (SA) information, and for content of SA transmissions. SAs may be transmitted during an initial communications period, followed by data transmissions for a certain time period. A device may monitor for transmissions during the SA period and then monitor for data transmissions during periods indicated in a received SA. SAs may be retransmitted according to a retransmission pattern that may provide time or frequency diversity patterns in order to enhance reception of SAs at a receiving device. Retransmission patterns may be determined based on a resource from an SA resource pool that is used for an initial transmission of the SA.

Claims

1. A method of wireless communications, comprising:

determining a first resource block within a first subframe of a scheduling assignment (SA) resource pool for transmitting an SA, the SA indicating resources for a subsequent transmission of data to one or more devices;

transmitting the SA to the one or more devices during the first resource block; and

retransmitting, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

2. The method of claim 1, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

3. The method of claim 1, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

4. The method of claim 3, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) or is a predefined pattern.

5. The method of claim 1, wherein the retransmission pattern is based at least in part on the first resource block.

6. The method of claim 5, wherein the retransmission pattern identifies time diverse resources within the SA resource pool, or frequency diverse resources within the SA resource pool, or a combination thereof.

7. The method of claim 5, wherein the SA resource pool comprises a plurality of Long Term Evolution (LTE) subframes.

8. The method of claim 1, further comprising:

receiving, from a base station, a grant for transmitting the SA.

9. The method of claim 8, wherein transmitting the SA comprises:

determining the first resource block for transmitting the SA based at least in part on the grant.

10. The method of claim 9, wherein the grant comprises downlink control information (DCI) comprising an index that identifies the first resource block within the SA resource pool.

11. The method of claim 10, wherein the index is included in a resource block assignment field of the DCI.

12. The method of claim 1, wherein the SA comprises a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data.

13. The method of claim 1, wherein the SA comprises a frequency hopping pattern for the subsequent transmission of data.

14. The method of claim 1, wherein the SA comprises a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID.

15. The method of claim 1, wherein the SA comprises an offset for a first data transmission with respect to the transmission of the SA.

16. The method of claim 1, wherein the SA further comprises a cyclic redundancy check (CRC) scrambled by a target identification (ID).

17. The method of claim 1, wherein the SA comprises an indicator of a last SA transmission.

102. The method of claim 1, further comprising:

determining, prior to transmitting the SA, to retransmit the SA.

18. An apparatus for wireless communications, comprising:

means for determining a first resource block within a first subframe of scheduling assignment (SA) resource pool for transmitting an SA, the SA indicating resources for a subsequent transmission of data to one or more devices;

means for transmitting the SA to the one or more devices during the first resource block; and

means for retransmitting, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

19. The apparatus of claim 18, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

20. The apparatus of claim 18, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

21. The apparatus of claim 20, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) or is a predefined pattern.

22. The apparatus of claim 18, wherein the retransmission pattern is based at least in part on the first resource block.

23. The apparatus of claim 22, wherein the retransmission pattern identifies time diverse resources within the SA resource pool, or frequency diverse resources within the SA resource pool, or a combination thereof.

24. The apparatus of claim 22, wherein the SA resource pool comprises a plurality of Long Term Evolution (LTE) subframes.

25. The apparatus of claim 18, further comprising:

means for receiving, from a base station, a grant for transmitting the SA.

26. The apparatus of claim 25, wherein the means for transmitting the SA determines the first resource block for transmitting the SA based at least in part on the grant.

27. The apparatus of claim 26, wherein the grant comprises downlink control information (DCI) comprising an index that identifies the first resource block within the SA resource pool.

28. The apparatus of claim 27, wherein the index is included in a resource block assignment field of the DCI.

29. The apparatus of claim 18, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission(s) of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data;

an offset for a first data transmission with respect to the transmission of the SA;

a cyclic redundancy check (CRC) scrambled by the target ID;

or

an indicator of a last SA transmission.

30. An apparatus for wireless communications, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

determine a first resource block within a first subframe of a scheduling assignment (SA) resource pool for transmitting an SA, the SA indicating resources for a subsequent transmission of data to one or more devices;

transmit the SA to the one or more devices during the first resource block; and

retransmit, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

31. The apparatus of claim 30, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

32. The apparatus of claim 31, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) or is a predefined pattern.

33. The apparatus of claim 30, wherein the retransmission pattern is based at least in part on the first resource block.

34. The apparatus of claim 30, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission(s) of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data;

or

an offset for a first data transmission with respect to the transmission of the SA.

35. A non-transitory computer-readable medium storing instructions executable by a processor to:

determine a first resource block within a first subframe of a scheduling assignment (SA) resource pool for transmitting an SA, the SA indicating resources for a subsequent transmission of data to one or more devices;

transmit the SA to the one or more devices during the first resource block; and

retransmit, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

36. The non-transitory computer-readable medium of claim 35, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

37. The non-transitory computer-readable medium of claim 35, wherein the retransmission pattern is based at least in part on the first resource block.

38. The non-transitory computer-readable medium of claim 35, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission(s) of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data;

or

an offset for a first data transmission with respect to the transmission of the SA.

39. A method of wireless communications, comprising:

receiving a message from a base station;

determining a scheduling assignment (SA) resource pool based at least in part on the message;

identifying a first resource block within a first subframe of the SA resource pool that is to be used for transmitting an SA to one or more receivers, the SA indicating resources for a subsequent transmission of data to the one or more receivers;

transmitting the SA to the one or more receivers during the first resource block; and

retransmitting, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

40. The method of claim 39, wherein the SA indicates resources for a subsequent transmission of data to the one or more receivers.

41. The method of claim 39, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

42. The method of claim 39, wherein the SA indicates resources for a subsequent transmission of data to the one or more receivers.

43. The method of claim 39, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

44. The method of claim 43, wherein the fixed frequency hopping pattern, the fixed time pattern, or combination thereof, is indicated in a system information block (SIB) or is a predefined pattern.

45. The method of claim 39, wherein the retransmission pattern identifies time diverse resources within the SA resource pool, or frequency diverse resources within the SA resource pool, or a combination thereof.

46. The method of claim 39, wherein SA resource pool comprises a plurality of Long Term Evolution (LTE) subframes.

47. The method of claim 39, wherein the message comprises downlink control information (DCI) comprising an index that identifies the first resource block in the SA resource pool.

48. The method of claim 47, wherein the index is included in a resource block assignment field of the DCI.

49. The method of claim 39, wherein the SA comprises a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data.

50. The method of claim 39, wherein the SA comprises a frequency hopping pattern for the subsequent transmission of data.

51. The method of claim 39, wherein the SA comprises a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID.

52. The method of claim 39, wherein the SA comprises an offset for a first data transmission with respect to the transmission of the SA.

53. An apparatus for wireless communications, comprising:

means for receiving a message from a base station;

means for determining a scheduling assignment (SA) resource pool based at least in part on the message;

means for identifying a first resource block within a first subframe of the SA resource pool that is to be used for transmitting an SA to one or more receivers, the SA indicating resources for a subsequent transmission of data to the one or more receivers;

means for transmitting the SA to the one or more receivers during the first resource block; and

means for retransmitting, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

54. The apparatus of claim 53, wherein the SA indicates resources for a subsequent transmission of data to the one or more receivers.

55. The apparatus of claim 53, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

56. The apparatus of claim 53, wherein the retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

57. The apparatus of claim 56, wherein the fixed frequency hopping pattern, the fixed time pattern, or combination thereof, is indicated in a system information block (SIB) or is a predefined pattern.

58. The apparatus of claim 53, wherein the retransmission pattern identifies time diverse resources within the SA resource pool, or frequency diverse resources within the SA resource pool, or a combination thereof.

59. The apparatus of claim 53, wherein SA resource pool comprises a plurality of Long Term Evolution (LTE) subframes.

60. The apparatus of claim 53, wherein the message comprises downlink control information (DCI) comprising an index that identifies the first resource block in the SA resource pool.

61. The apparatus of claim 60, wherein the index is included in a resource block assignment field of the DCI.

62. The apparatus of claim 53, wherein the SA comprises a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data.

63. The apparatus of claim 53, wherein the SA comprises a frequency hopping pattern for the subsequent transmission of data.

64. The apparatus of claim 53, wherein the SA comprises a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID.

65. The apparatus of claim 53, wherein the SA comprises an offset for a first data transmission with respect to the transmission of the SA.

66. An apparatus for wireless communications, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

receive a message from a base station;

determine a scheduling assignment (SA) resource pool based at least in part on the message;

identify a first resource block within a first subframe of the SA resource pool that is to be used for transmitting an SA to one or more receivers, the SA indicating resources for a subsequent transmission of data to the one or more receivers;

transmit the SA to the one or more receivers during the first resource block; and

retransmit, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

67. The apparatus of claim 66, wherein the SA indicates resources for a subsequent transmission of data to the one or more receivers.

68. The apparatus of claim 66, wherein the message comprises downlink control information (DCI) comprising an index that identifies the first resource block in the SA resource pool.

69. The apparatus of claim 66, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data;

or

an offset for a first data transmission with respect to the transmission of the SA.

70. A non-transitory computer-readable medium storing instructions executable by a processor to:

receive a message from a base station;

determine a scheduling assignment (SA) resource pool based at least in part on the message;

identify a first resource block within a first subframe of the SA resource pool that is to be used for transmitting an SA to one or more receivers, the SA indicating resources for a subsequent transmission of data to the one or more receivers;

transmit the SA to the one or more receivers during the first resource block; and

retransmit, independent of feedback for the SA transmission and before the subsequent transmission of data, the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern such that a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

71. The non-transitory computer-readable medium of claim 70, wherein the SA indicates resources for a subsequent transmission of data to the one or more receivers.

72. The non-transitory computer-readable medium of claim 70, wherein the message comprises downlink control information (DCI) comprising an index that identifies the first resource block in the SA resource pool.

73. The non-transitory computer-readable medium of claim 70, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data;

or

an offset for a first data transmission with respect to the transmission of the SA.

74. A method of wireless communications, comprising:

receiving a scheduling assignment (SA) transmission, the SA indicating resources for receiving a subsequent transmission of data;

determining a first resource block within a first subframe of an SA resource pool during which the SA transmission is received; and

receiving, independent of feedback for the SA transmission and before receiving the subsequent transmission of data, at least one retransmission of the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern, wherein a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

75. The method of claim 74, further comprising:

combining the SA transmission and the at least one retransmission to determine the SA.

76. The method of claim 74, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

77. The method of claim 74, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

78. The method of claim 77, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) received from a transmitting device, or is a predefined pattern.

79. The method of claim 74, wherein the retransmission pattern is based at least in part on the first resource block.

80. The method of claim 74, wherein the SA comprises a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data.

81. The method of claim 74, wherein the SA comprises a frequency hopping pattern for the subsequent transmission of data.

82. The method of claim 74, wherein the SA comprises a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID.

83. The method of claim 74, wherein the SA further comprises a cyclic redundancy check (CRC) scrambled by a target identification (ID).

84. The method of claim 74, wherein the SA comprises an offset for a first data transmission with respect to the SA resource pool or the transmission of the SA.

85. An apparatus for wireless communications, comprising:

means for receiving a scheduling assignment (SA) transmission, the SA indicating resources for receiving a subsequent transmission of data;

means for determining a first resource block within a first subframe of an SA resource pool during which the SA transmission is received; and

means for receiving, independent of feedback for the SA transmission and before receiving the subsequent transmission of data, at least one retransmission of the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern, wherein a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

86. The apparatus of claim 85, further comprising:

means for combining the SA transmission and the at least one retransmission to determine the SA.

87. The apparatus of claim 85, wherein the SA is transmitted in a device-to-device (D2D) broadcast transmission.

88. The apparatus of claim 85, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

89. The apparatus of claim 88, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) received from a transmitting device, or is a predefined pattern.

90. The apparatus of claim 85, wherein the retransmission pattern is based at least in part on the first resource block.

91. The apparatus of claim 85, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID;

or

an offset for a first data transmission with respect to the SA resource pool or the transmission of the SA.

92. An apparatus for wireless communications, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to;

receive a scheduling assignment (SA) transmission, the SA indicating resources for receiving a subsequent transmission of data;

determine a first resource block within a first subframe of an SA resource pool during which the SA transmission is received; and

receive, independent of feedback for the SA transmission and before receiving the subsequent transmission of data, at least one retransmission of the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern, wherein a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

93. The apparatus of claim 92, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

94. The apparatus of claim 93, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) received from a transmitting device, or is a predefined pattern.

95. The apparatus of claim 92, wherein the retransmission pattern is based at least in part on the first resource block.

96. The apparatus of claim 92, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID;

or

an offset for a first data transmission with respect to the SA resource pool or the transmission of the SA.

97. A non-transitory computer-readable medium storing instructions executable by a processor to:

receive a scheduling assignment (SA) transmission, the SA indicating resources for receiving a subsequent transmission of data;

determine a first resource block within a first subframe of an SA resource pool during which the SA transmission is received; and

receive, independent of feedback for the SA transmission and before receiving the subsequent transmission of data, at least one retransmission of the SA during a second resource block within a second subframe of the same SA resource pool according to a predetermined retransmission pattern, wherein a position of the second resource block within the second subframe is different from and based at least in part on a position of the first resource block within the first subframe.

98. The non-transitory computer-readable medium of claim 97, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

99. The non-transitory computer-readable medium of claim 98, wherein the fixed frequency hopping pattern, fixed time pattern, or combination thereof is indicated in a system information block (SIB) received from a transmitting device, or is a predefined pattern.

100. The non-transitory computer-readable medium of claim 97, wherein the retransmission pattern is based at least in part on the first resource block.

101. The non-transitory computer-readable medium of claim 97, wherein the SA comprises one or more of:

a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data;

a frequency hopping pattern for the subsequent transmission of data;

a target identification (ID) for the subsequent transmission of data, and wherein the subsequent transmission of data is scrambled using the target ID;

or

an offset for a first data transmission with respect to the SA resource pool or the transmission of the SA.