SCHEDULING ASSIGNMENT CONTENT AND TRANSMISSION IN WIRELESS COMMUNICATIONS

• US 20150271840A1
• Filed: 01/29/2015
• Published: 09/24/2015
• 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
• Granted Patent: US 10,524,282 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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:

transmitting a scheduling assignment (SA) to one or more devices, the SA indicating resources for a subsequent transmission of data to the one or more devices; and

retransmitting the SA according to a predetermined retransmission pattern.

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, further comprising:

determining a first resource block within an SA resource pool for transmitting the SA; and

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 one or more of:

time diverse resources within the SA resource pool;

or

frequency diverse resources within the SA resource pool.

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 a grant for transmitting the SA from a base station.

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

determining a 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 an 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(s) 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 ID.

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

18. An apparatus for wireless communications, comprising:

means for transmitting a scheduling assignment (SA) to one or more devices, the SA indicating resources for a subsequent transmission of data to the one or more devices; and

means for retransmitting the SA according to a predetermined retransmission pattern.

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, further comprising:

means for determining a first resource block within an SA resource pool for transmitting the SA; and

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 one or more of:

time diverse resources within the SA resource pool;

or

frequency diverse resources within the SA resource pool.

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 a grant for transmitting the SA from a base station.

26. The apparatus of claim 25, wherein the means for transmitting the SA determines a 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 an 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;

transmit a scheduling assignment (SA) to one or more devices, the SA indicating resources for a subsequent transmission of data to the one or more devices; and

retransmit the SA according to a predetermined retransmission pattern.

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 instructions are further executable by the processor to determine a first resource block within an SA resource pool for transmitting the SA, and 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:

transmit a scheduling assignment (SA) to one or more devices, the SA indicating resources for a subsequent transmission of data to the one or more devices; and

retransmit the SA according to a predetermined retransmission pattern.

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 instructions are further executable by the processor to determine a first resource block within an SA resource pool for transmitting the SA, and 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; and

identifying a first resource block within the SA resource pool that is to be used for transmitting an SA to one or more receivers.

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, further comprising:

transmitting a first SA to the one or more receivers during the first resource block, the first SA indicating resources for a subsequent transmission of data to the one or more receivers; and

retransmitting the first SA according to a predetermined retransmission pattern.

43. The method of claim 42, 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 42, wherein the retransmission pattern identifies one or more of:

time diverse resources within the SA resource pool;

or

frequency diverse resources within the SA resource pool.

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; and

means for identifying a first resource block within the SA resource pool that is to be used for transmitting an SA to one or more receivers.

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, further comprising:

means for transmitting a first SA to the one or more receivers during the first resource block, the first SA indicating resources for a subsequent transmission of data to the one or more receivers; and

means for retransmitting the first SA according to a predetermined retransmission pattern.

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

58. The apparatus of claim 57, 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.

59. The apparatus of claim 56, wherein the retransmission pattern identifies one or more of:

time diverse resources within the SA resource pool;

or

frequency diverse resources within the SA resource pool.

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

61. 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.

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

63. 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.

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

65. 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.

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

67. 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; and

identify a first resource block within the SA resource pool that is to be used for transmitting an SA to one or more receivers.

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

69. The apparatus of claim 67, wherein the instructions are further executable by the processor to:

transmit a first SA to the one or more receivers during the first resource block, the first SA indicating resources for a subsequent transmission of data to the one or more receivers; and

retransmit the first SA according to a predetermined retransmission pattern.

70. The apparatus of claim 67, wherein the message comprises downlink control information (DCI) comprising an index that identifies the first resource block in the SA resource pool.

71. The apparatus of claim 67, 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.

72. 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; and

identify a first resource block within the SA resource pool that is to be used for transmitting an SA to one or more receivers.

73. The non-transitory computer-readable medium of claim 72, wherein the instructions are further executable by the processor to:

transmit a first SA to the one or more receivers during the first resource block, the first SA indicating resources for a subsequent transmission of data to the one or more receivers; and

retransmit the first SA according to a predetermined retransmission pattern.

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

75. The non-transitory computer-readable medium of claim 72, 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.

76. A method of wireless communications, comprising:

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

receiving at least one retransmission of the SA according to a predetermined retransmission pattern.

77. The method of claim 76, further comprising:

combining the SA transmission and retransmission(s) to determine the SA.

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

79. The method of claim 76, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

80. The method of claim 79, 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.

81. The method of claim 76, further comprising:

determining a first resource block where the SA transmission is received; and

wherein the retransmission pattern is based at least in part on the first resource block.

82. The method of claim 76, wherein the SA comprises a modulation and coding scheme (MCS) and a redundancy version (RV) for the subsequent transmission of data.

83. The method of claim 76, wherein the SA comprises a frequency hopping pattern for the subsequent transmission of data.

84. The method of claim 76, 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.

85. The method of claim 76, wherein the SA further comprises a cyclic redundancy check (CRC) scrambled by a target ID.

86. The method of claim 76, wherein the SA comprises an offset for a first data transmission with respect to an SA resource pool or the transmission of the SA.

87. 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; and

means for receiving at least one retransmission of the SA according to a predetermined retransmission pattern.

88. The apparatus of claim 87, further comprising:

means for combining the SA transmission and retransmission(s) to determine the SA.

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

90. The apparatus of claim 87, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

91. The apparatus of claim 90, 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.

92. The apparatus of claim 87, further comprising:

means for determining a first resource block where the SA transmission is received; and

wherein the retransmission pattern is based at least in part on the first resource block.

93. The apparatus of claim 87, 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 an SA resource pool or the transmission of the SA.

94. 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; and

receive at least one retransmission of the SA according to a predetermined retransmission pattern.

95. The apparatus of claim 94, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

96. The apparatus of claim 95, 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.

97. The apparatus of claim 94, wherein the instructions are further executable by the processor to:

determine a first resource block where the SA transmission is received; and

wherein the retransmission pattern is based at least in part on the first resource block.

98. The apparatus of claim 94, 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 an SA resource pool or the transmission of the SA.

99. 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; and

receive at least one retransmission of the SA according to a predetermined retransmission pattern.

100. The non-transitory computer-readable medium of claim 99, wherein the predetermined retransmission pattern comprises a fixed frequency hopping pattern, a fixed time pattern, or a combination thereof.

101. The non-transitory computer-readable medium of claim 100, 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.

102. The non-transitory computer-readable medium of claim 99, wherein the instructions are further executable by the processor to:

determine a first resource block where the SA transmission is received; and

wherein the retransmission pattern is based at least in part on the first resource block.

103. The non-transitory computer-readable medium of claim 99, 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 an SA resource pool or the transmission of the SA.