ENHANCED TTI BUNDLING WITH FLEXIBLE HARQ MERGING

• US 20130343273A1
• Filed: 06/06/2013
• Published: 12/26/2013
• Est. Priority Date: 06/26/2012
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: BARBIERI, Alan, XU, Hao
• Application Number:
  US13/912,161
• Publication Number:
  US 20130343273A1
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided in which mandated retransmission of data packets according to a compressed timeline provide an alternative to TTI bundling. A first data unit is transmitted in a first subframe and automatically retransmitted in one or more non-consecutive subframes before a response to a preceding transmission or retransmission of the first data unit has been processed. The retransmissions are terminated after an acknowledgement is processed. The automatic retransmissions occur periodically with a predetermined number of intervening subframes transmitted before each retransmission of the first data unit.

Claims

1. A method of wireless communication, comprising:

transmitting a first data unit in a first subframe using one of a plurality of redundancy versions of the first data unit;

automatically retransmitting the first data unit in non-consecutive subframes using the plurality of redundancy versions of the first data unit, wherein the first data unit is retransmitted before a hybrid automatic repeat request (HARQ) response to a preceding transmission or retransmission of the first data unit has been processed; and

terminating retransmissions of the first data unit after a processed HARQ response is determined to comprise an acknowledgement (ACK).

2. The method of claim 1, wherein the automatic retransmissions occur periodically.

3. The method of claim 2, wherein a predetermined number of intervening subframes are transmitted before each retransmission of the first data unit.

4. The method of claim 3, further comprising transmitting and automatically retransmitting a second data unit using redundancy versions of the second data unit in a plurality of the intervening subframes until a processed HARQ response to the transmission or the retransmission of the second data unit is determined to comprise an ACK.

5. The method of claim 4, wherein the second data unit is transmitted and retransmitted in non-consecutive subframes.

6. The method of claim 5, wherein a number of intervening subframes are transmitted before each retransmission of the second data unit.

7. The method of claim 6, wherein the same number of intervening subframes is transmitted before retransmissions of the first and second data units.

8. The method of claim 6, wherein a different number of intervening subframes is transmitted before retransmissions of the first and second data units.

9. The method of claim 1, further comprising terminating retransmissions of the first data unit after a predetermined maximum number of retransmissions.

10. The method of claim 9, wherein a maximum delay is defined for the first data unit, and wherein the maximum number of retransmissions is determined based on the maximum delay.

11. The method of claim 10, wherein the maximum number of retransmissions is determined based on a number of intervening subframes that are transmitted before each retransmission of the first data unit.

12. The method of claim 10, wherein the first data unit comprises voice data.

13. The method of claim 10, wherein the first data unit comprises voice over IP (VoIP) data.

14. An apparatus for wireless communication, comprising:

means for transmitting a first data unit in a first subframe using one of a plurality of redundancy versions of the first data unit;

means for automatically retransmitting the first data unit in non-consecutive subframes using the plurality of redundancy versions of the first data unit, wherein the first data unit is retransmitted before a hybrid automatic repeat request (HARQ) response to a preceding transmission or retransmission of the first data unit has been processed; and

means for terminating retransmissions of the first data unit after a processed HARQ response is determined to comprise an acknowledgement (ACK).

15. The apparatus of claim 14, wherein the automatic retransmissions occur periodically.

16. The apparatus of claim 15, wherein a predetermined number of intervening subframes are transmitted before each retransmission of the first data unit.

17. The apparatus of claim 16, wherein the means for transmitting and means for automatically retransmitting transmit and retransmit a second data unit using redundancy versions of the second data unit in a plurality of the intervening subframes until a processed HARQ response to the transmission or the retransmission of the second data unit is determined to comprise an ACK.

18. The apparatus of claim 17, wherein the second data unit is transmitted and retransmitted in non-consecutive subframes.

19. The apparatus of claim 18, wherein a number of intervening subframes are transmitted before each retransmission of the second data unit.

20. The apparatus of claim 19, wherein the same number of intervening subframes is transmitted before retransmissions of the first and second data units.

21. The apparatus of claim 19, wherein a different number of intervening subframes is transmitted before retransmissions of the first and second data units.

22. The apparatus of claim 14, wherein the means for terminating retransmissions of the first data unit is further configured to terminate the retransmissions after a predetermined maximum number of retransmissions.

23. The apparatus of claim 22, wherein a maximum delay is defined for the first data unit, and wherein the maximum number of retransmissions is determined based on the maximum delay.

24. The apparatus of claim 23, wherein the maximum number of retransmissions is determined based on a number of intervening subframes that are transmitted before each retransmission of the first data unit.

25. The apparatus of claim 23, wherein the first data unit comprises voice data.

26. The apparatus of claim 23, wherein the first data unit comprises voice over IP (VoIP) data.

27. An apparatus for wireless communication, comprising:

a processing system configured to;

transmit a first data unit in a first subframe using one of a plurality of redundancy versions of the first data unit;

automatically retransmit the first data unit in non-consecutive subframes using the plurality of redundancy versions of the first data unit, wherein the first data unit is retransmitted before a hybrid automatic repeat request (HARQ) response to a preceding transmission or retransmission of the first data unit has been processed; and

terminate retransmissions of the first data unit after a processed HARQ response is determined to comprise an acknowledgement (ACK).

28. A computer program product, comprising:

a computer-readable medium comprising code for;

transmitting a first data unit in a first subframe using one of a plurality of redundancy versions of the first data unit;

automatically retransmitting the first data unit in non-consecutive subframes using the plurality of redundancy versions of the first data unit, wherein the first data unit is retransmitted before a hybrid automatic repeat request (HARQ) response to a preceding transmission or retransmission of the first data unit has been processed; and

terminating retransmissions of the first data unit after a processed HARQ response is determined to comprise an acknowledgement (ACK).

29. A method of wireless communication, comprising:

providing a grant to a user equipment (UE), the grant providing resources for automatic retransmission of a data unit;

receiving a first redundancy version of the data unit;

transmitting a hybrid automatic repeat request (HARQ) response to the first redundancy version of the data unit; and

receiving a second redundancy version of the data unit while concurrently transmitting the HARQ response.

30. The method of claim 29, further comprising transmitting a negative acknowledgement (NACK) as a HARQ response to each of a plurality of redundancy versions of the data unit, the plurality of redundancy version including the first and second redundancy versions of the data unit.

31. The method of claim 30, further comprising transmitting an acknowledgement (ACK) as a HARQ response when the data unit can be derived from the plurality of redundancy versions of the data unit.

32. The method of claim 30, wherein the grant defines a number of intervening subframes to be transmitted by the UE before each transmission of a redundancy version of the data unit.

33. The method of claim 29, wherein the grant defines a maximum number of transmissions of redundancy versions of the data unit.

34. The method of claim 33, wherein the maximum number of transmissions is based on a maximum delay permitted for the data unit.

35. The method of claim 34, wherein the first data unit comprises voice data.

36. The method of claim 34, wherein the first data unit comprises voice over IP data.

37. The method of claim 29, further comprising:

determining a probability that the data unit can be derived from a next redundancy version of the data unit; and

transmitting an ACK as a HARQ response when the probability exceeds a threshold and before the next redundancy version of the data unit is processed.

38. The method of claim 37, wherein the probability is determined based on previously received log-likelihood ratios (LLRs).

39. The method of claim 37, wherein the probability is determined based on one or more of LLR average energy, LLR average magnitude, intrinsic information in a plurality of LLRs, a number of errors determined after turbo decoding, and an average combined signal-to-interference-and-noise ratio.

40. An apparatus for wireless communication, comprising:

means for providing a grant to a user equipment (UE), the grant providing resources for automatic retransmission of a data unit;

means for receiving a first redundancy version of the data unit;

means for transmitting a hybrid automatic repeat request (HARQ) response to the first redundancy version of the data unit; and

means for receiving a second redundancy version of the data unit while concurrently transmitting the HARQ response.

41. The apparatus of claim 40, further comprising transmitting a negative acknowledgement (NACK) as a HARQ response to each of a plurality of redundancy versions of the data unit, the plurality of redundancy version including the first and second redundancy versions of the data unit.

42. The apparatus of claim 41, further comprising transmitting an acknowledgement (ACK) as a HARQ response when the data unit can be derived from the plurality of redundancy versions of the data unit.

43. The apparatus of claim 40, wherein the grant defines a number of intervening subframes to be transmitted by the UE before each transmission of a redundancy version of the data unit.

44. The apparatus of claim 40, wherein the grant defines a maximum number of transmissions of redundancy versions of the data unit.

45. The apparatus of claim 44, wherein the maximum number of transmissions is based on a maximum delay permitted for the data unit.

46. The apparatus of claim 45, wherein the first data unit comprises voice data.

47. The apparatus of claim 45, wherein the first data unit comprises voice over IP data.

48. The apparatus of claim 40, further comprising:

determining a probability that the data unit can be derived from a next redundancy version of the data unit; and

transmitting an ACK as a HARQ response when the probability exceeds a threshold and before the next redundancy version of the data unit is processed.

49. The apparatus of claim 48, wherein the probability is determined based on previously received log-likelihood ratios (LLRs).

50. The apparatus of claim 48, wherein the probability is determined based on one or more of LLR average energy, LLR average magnitude, intrinsic information in a plurality of LLRs, a number of errors determined after turbo decoding, and an average combined signal-to-interference-and-noise ratio.

51. An apparatus for wireless communication, comprising:

a processing system configured to;

provide a grant to a user equipment (UE), the grant providing resources for automatic retransmission of a data unit;

receive a first redundancy version of the data unit;

transmit a hybrid automatic repeat request (HARQ) response to the first redundancy version of the data unit; and

receive a second redundancy version of the data unit while concurrently transmitting the HARQ response.

52. A computer program product, comprising:

a computer-readable medium comprising code for;

providing a grant to a user equipment (UE), the grant providing resources for automatic retransmission of a data unit;

receiving a first redundancy version of the data unit;

transmitting a hybrid automatic repeat request (HARQ) response to the first redundancy version of the data unit; and

receiving a second redundancy version of the data unit while concurrently transmitting the HARQ response.