METHODS AND APPARATUS FOR TDD RECONFIGURATION

• US 20130286904A1
• Filed: 04/25/2013
• Published: 10/31/2013
• Est. Priority Date: 04/27/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Hao, Chen, Wanshi, Gaal, Peter, Geirhofer, Stefan
• Granted Patent: US 9,451,595 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Transmission of control data by a user equipment (UE) in circumstances following a TDD subframe reconfiguration from an evolved node B (eNB) may result in a conflict with a scheduled transmission of the control data. In one example, a UE may modify periodicity, content, priority, or other aspects of channel state information (CSI) or sounding reference signals (SRS) to resolve any conflicts resulting from a TDD subframe reconfiguration and to ensure transmission of the CSI or SRS. In another example, a UE may detect a hybrid automatic repeat request (HARQ) conflict resulting from a TDD subframe reconfiguration. In such example, the UE may determine and apply a HARQ soft buffer size for a HARQ process or determine and apply a codebook size for a HARQ process in carrier aggregation to resolve such HARQ conflict.

Claims

1. A method for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

detecting a TDD subframe reconfiguration; and

modifying at least one aspect of a channel state information (CSI) or a sounding reference signal (SRS) transmission based on the TDD subframe reconfiguration.

2. The method of claim 1, wherein the modifying comprises modifying a periodicity of the CSI or the SRS transmission.

3. The method of claim 2, wherein the modifying the periodicity comprises at least one of receiving a configuration index related to a new periodicity for the CSI or SRS transmission, dropping at least one instance of the CSI or SRS transmission based on a scheduling conflict with the TDD subframe reconfiguration, or utilizing a configuration corresponding to a next lowest or highest configuration index related to the CSI or the SRS transmission.

4. The method of claim 1, wherein the modifying comprises modifying a content of the CSI or the SRS transmission.

5. The method of claim 4, wherein the modifying the content comprises computing a subband for transmitting the CSI or the SRS transmission based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration.

6. The method of claim 1, wherein the modifying comprises modifying a rank indicator (RI) or a precoding type indicator (PTI) related to the CSI or the SRS transmission.

7. The method of claim 6, wherein the modifying the RI or the PTI comprises using at least one of a previous RI or PTI from a TDD subframe configuration before the TDD subframe reconfiguration, a previous RI or PTI from a TDD subframe configuration after the TDD subframe reconfiguration, a common RI or PTI for the TDD subframe reconfiguration, or a lowest allowed RI or PTI.

8. The method of claim 1, wherein the modifying comprises selecting a next TDD subframe reconfiguration in a set of received TDD subframe reconfigurations based on detecting a conflict between the CSI or the SRS transmission and the TDD subframe reconfiguration.

9. The method of claim 1, further comprising:

detecting a different TDD subframe reconfiguration for a data transmission; and

modifying the data transmission based on the different TDD subframe reconfiguration.

10. A method for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

detecting a TDD subframe reconfiguration; and

modifying at least a hybrid automatic repeat request (HARQ) soft buffer size or a codebook size for a HARQ process based on the TDD subframe reconfiguration.

11. The method of claim 10, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

12. The method of claim 10, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on a static or semi-static value during transition to the TDD subframe reconfiguration, or based on a dynamic value outside of the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

13. The method of claim 10, wherein the modifying comprises:

determining the codebook size for the HARQ process in carrier aggregation; and

applying the determined codebook size.

14. An apparatus for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

means for detecting a TDD subframe reconfiguration; and

means for modifying at least one aspect of a channel state information (CSI) or a sounding reference signal (SRS) transmission based on the TDD subframe reconfiguration.

15. The apparatus of claim 14, wherein the modifying comprises modifying a periodicity of the CSI or the SRS transmission.

16. The apparatus of claim 15, wherein the modifying the periodicity comprises at least one of receiving a configuration index related to a new periodicity for the CSI or SRS transmission, dropping at least one instance of the CSI or SRS transmission based on a scheduling conflict with the TDD subframe reconfiguration, or utilizing a configuration corresponding to a next lowest or highest configuration index related to the CSI or the SRS transmission.

17. The apparatus of claim 14, wherein the modifying comprises modifying a content of the CSI or the SRS transmission.

18. The apparatus of claim 17, wherein the modifying the content comprises computing a subband for transmitting the CSI or the SRS transmission based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration.

19. The apparatus of claim 14, wherein the modifying comprises modifying a rank indicator (RI) or a precoding type indicator (PTI) related to the CSI or the SRS transmission.

20. The apparatus of claim 19, wherein the modifying the RI or the PTI comprises using at least one of a previous RI or PTI from a TDD subframe configuration before the TDD subframe reconfiguration, a previous RI or PTI from a TDD subframe configuration after the TDD subframe reconfiguration, a common RI or PTI for the TDD subframe reconfiguration, or a lowest allowed RI or PTI.

21. The apparatus of claim 14, wherein the modifying comprises selecting a next TDD subframe reconfiguration in a set of received TDD subframe reconfigurations based on detecting a conflict between the CSI or the SRS transmission and the TDD subframe reconfiguration.

22. The apparatus of claim 14, further comprising:

means for detecting a different TDD subframe reconfiguration for a data transmission; and

means for modifying the data transmission based on the different TDD subframe reconfiguration.

23. An apparatus for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

means for detecting a TDD subframe reconfiguration; and

means for modifying at least a hybrid automatic repeat request (HARQ) soft buffer size or a codebook size for a HARQ process based on the TDD subframe reconfiguration.

24. The apparatus of claim 23, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

25. The apparatus of claim 23, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on a static or semi-static value during transition to the TDD subframe reconfiguration, or based on a dynamic value outside of the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

26. The apparatus of claim 23, wherein the modifying comprises:

determining the codebook size for the HARQ process in carrier aggregation; and

applying the determined codebook size.

27. An apparatus for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

a processing system configured to;

detect a TDD subframe reconfiguration; and

modify at least one aspect of a channel state information (CSI) or a sounding reference signal (SRS) transmission based on the TDD subframe reconfiguration.

28. The apparatus of claim 27, wherein the modifying comprises modifying a periodicity of the CSI or the SRS transmission.

29. The apparatus of claim 28, wherein the modifying the periodicity comprises at least one of receiving a configuration index related to a new periodicity for the CSI or SRS transmission, dropping at least one instance of the CSI or SRS transmission based on a scheduling conflict with the TDD subframe reconfiguration, or utilizing a configuration corresponding to a next lowest or highest configuration index related to the CSI or the SRS transmission.

30. The apparatus of claim 27, wherein the modifying comprises modifying a content of the CSI or the SRS transmission.

31. The apparatus of claim 30, wherein the modifying the content comprises computing a subband for transmitting the CSI or the SRS transmission based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration.

32. The apparatus of claim 27, wherein the modifying comprises modifying a rank indicator (RI) or a precoding type indicator (PTI) related to the CSI or the SRS transmission.

33. The apparatus of claim 32, wherein the modifying the RI or the PTI comprises using at least one of a previous RI or PTI from a TDD subframe configuration before the TDD subframe reconfiguration, a previous RI or PTI from a TDD subframe configuration after the TDD subframe reconfiguration, a common RI or PTI for the TDD subframe reconfiguration, or a lowest allowed RI or PTI.

34. The apparatus of claim 27, wherein the modifying comprises selecting a next TDD subframe reconfiguration in a set of received TDD subframe reconfigurations based on detecting a conflict between the CSI or the SRS transmission and the TDD subframe reconfiguration.

35. The apparatus of claim 27, further comprising:

detecting a different TDD subframe reconfiguration for a data transmission; and

modifying the data transmission based on the different TDD subframe reconfiguration.

36. An apparatus for configuring control data communications based on a time division duplexing (TDD) subframe reconfiguration, comprising:

a processing system configured to;

detect a TDD subframe reconfiguration; and

modify at least a hybrid automatic repeat request (HARQ) soft buffer size or a codebook size for a HARQ process based on the TDD subframe reconfiguration.

37. The apparatus of claim 36, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

38. The apparatus of claim 36, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on a static or semi-static value during transition to the TDD subframe reconfiguration, or based on a dynamic value outside of the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

39. The apparatus of claim 36, wherein the modifying comprises:

determining the codebook size for the HARQ process in carrier aggregation; and

applying the determined codebook size.

40. A computer program product, comprising:

a computer-readable medium comprising code for;

detecting a time division duplexing (TDD) subframe reconfiguration; and

modifying at least one aspect of a channel state information (CSI) or a sounding reference signal (SRS) transmission based on the TDD subframe reconfiguration.

41. The computer program product of claim 40, wherein the modifying comprises modifying a periodicity of the CSI or the SRS transmission.

42. The computer program product of claim 41, wherein the modifying the periodicity comprises at least one of receiving a configuration index related to a new periodicity for the CSI or SRS transmission, dropping at least one instance of the CSI or SRS transmission based on a scheduling conflict with the TDD subframe reconfiguration, or utilizing a configuration corresponding to a next lowest or highest configuration index related to the CSI or the SRS transmission.

43. The computer program product of claim 40, wherein the modifying comprises modifying a content of the CSI or the SRS transmission.

44. The computer program product of claim 43, wherein the modifying the content comprises computing a subband for transmitting the CSI or the SRS transmission based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration.

45. The computer program product of claim 40, wherein the modifying comprises modifying a rank indicator (RI) or a precoding type indicator (PTI) related to the CSI or the SRS transmission.

46. The computer program product of claim 45, wherein the modifying the RI or the PTI comprises using at least one of a previous RI or PTI from a TDD subframe configuration before the TDD subframe reconfiguration, a previous RI or PTI from a TDD subframe configuration after the TDD subframe reconfiguration, a common RI or PTI for the TDD subframe reconfiguration, or a lowest allowed RI or PTI.

47. The computer program product of claim 40, wherein the modifying comprises selecting a next TDD subframe reconfiguration in a set of received TDD subframe reconfigurations based on detecting a conflict between the CSI or the SRS transmission and the TDD subframe reconfiguration.

48. The computer program product of claim 40, further comprising:

detecting a different TDD subframe reconfiguration for a data transmission; and

modifying the data transmission based on the different TDD subframe reconfiguration.

49. A computer program product, comprising:

a computer-readable medium comprising code for;

detecting a time division duplexing (TDD) subframe reconfiguration; and

modifying at least a hybrid automatic repeat request (HARQ) soft buffer size or a codebook size for a HARQ process based on the TDD subframe reconfiguration.

50. The computer program product of claim 49, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on at least one of a TDD subframe configuration before the TDD subframe reconfiguration or a TDD subframe configuration after the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

51. The computer program product of claim 49, wherein the modifying comprises:

determining the HARQ soft buffer size for the HARQ process based on a static or semi-static value during transition to the TDD subframe reconfiguration, or based on a dynamic value outside of the TDD subframe reconfiguration; and

applying the determined HARQ soft buffer size.

52. The computer program product of claim 49, wherein the modifying comprises:

determining the codebook size for the HARQ process in carrier aggregation; and

applying the determined codebook size.