TIMING MANAGEMENT IN UPLINK (UL) COORDINATED MULTIPOINT (COMP) TRANSMISSION

• US 20130195086A1
• Filed: 01/31/2013
• Published: 08/01/2013
• Est. Priority Date: 02/01/2012
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xu, Hao, Gaal, Peter, Chen, Wanshi, Wei, Yongbin
• Application Number:
  US13/755,382
• Publication Number:
  US 20130195086A1
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04L 1/0077 Cooperative coding
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

According to example embodiments, a method for wireless communications by a user equipment (UE) includes receiving signaling indicating multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points, and applying at least one of the multiple TAs when transmitting on at least one of the uplink channels. According to example embodiments, a method for wireless communications by a base station includes determining multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points, and transmitting signaling indicating the multiple timing adjustments (TAs) to the UE.

Claims

1. A method for wireless communications by a user equipment (UE), comprising:

receiving signaling indicating multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

applying at least one of the multiple TAs when transmitting on at least one of the uplink channels.

2. The method of claim 1, wherein:

the multiple TAs comprise TAs for different channels of different cells.

3. The method of claim 1, wherein the applying comprises:

applying at least two different TAs within the same subframe for different channels.

4. The method of claim 1, wherein the applying comprises:

applying a single one of the multiple TAs when transmitting different channels intended for different transmission points within the same subframe.

5. The method of claim 4, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

6. The method of claim 5, wherein applying a single one of the multiple TAs comprises applying a TA for the SRS channel when transmitting at least one of the PUSCH or PUCCH.

7. The method of claim 5, wherein applying a single one of the multiple TAs comprises applying a TA for at least one of the PUSCH or PUCCH when transmitting the SRS channel.

8. The method of claim 1, wherein the UE receives different TAs for different channels on different subframes.

9. The method of claim 1, further comprising:

determining if different TAs for at least two uplink channels to be transmitted in a common subframe differ by a threshold amount; and

if so, refraining from transmitting one of the at least two uplink channels in the common subframe.

10. The method of claim 9, wherein the UE refrains from transmitting SRS in a common subframe and transmits at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

11. The method of claim 1, further comprising:

determining if different TAs for a sounding reference signal (SRS) channel and physical uplink shared channel (PUSCH) to be transmitted in a common subframe differ by a threshold amount; and

if so, erasing at least a portion of one of the SRS channel or the PUSCH.

12. The method of claim 11, further comprising receiving signaling indicating whether to erase at least a portion of the SRS channel or the PUSCH.

13. A method for wireless communications by a base station, comprising:

determining multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

transmitting signaling indicating the multiple timing adjustments (TAs) to the UE.

14. The method of claim 13, wherein:

the multiple TAs comprise TAs for different channels of different cells.

15. The method of claim 14, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

16. The method of claim 13, wherein the TAs comprise different TAs for different channels on different subframes.

17. The method of claim 16, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

18. The method of claim 17, wherein the UE applies a single one of the multiple TAs when transmitting both SRS and at least one of the PUSCH or PUCCH.

19. The method of claim 18, further comprising:

processing received signals in a manner that accounts for the UE applying a single one of the multiple TAs.

20. The method of claim 19, further comprising:

transmitting signaling to the UE indicating whether the UE should erase a portion of a sounding reference signal (SRS) channel or a portion of a physical uplink shared channel (PUSCH) if the UE has been provided different TAs for the SRS channel and PUSCH to be transmitted in a common subframe.

21. An apparatus for wireless communications, comprising:

means for receiving signaling indicating multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

means for applying at least one of the multiple TAs when transmitting on at least one of the uplink channels.

23. The apparatus of claim 21, wherein the applying comprises:

applying at least two different TAs within the same subframe for different channels.

24. The apparatus of claim 21, wherein the applying comprises:

applying a single one of the multiple TAs when transmitting different channels intended for different transmission points within the same subframe.

25. The apparatus of claim 24, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

26. The apparatus of claim 25, wherein applying a single one of the multiple TAs comprises applying a TA for the SRS channel when transmitting at least one of the PUSCH or PUCCH.

27. The apparatus of claim 25, wherein applying a single one of the multiple TAs comprises applying a TA for at least one of the PUSCH or PUCCH when transmitting the SRS channel.

28. The apparatus of claim 21, wherein the UE receives different TAs for different channels on different subframes.

29. The apparatus of claim 21, further comprising:

means for determining if different TAs for at least two uplink channels to be transmitted in a common subframe differ by a threshold amount; and

means for, if so, refraining from transmitting one of the at least two uplink channels in the common subframe.

30. The apparatus of claim 29, wherein the UE refrains from transmitting SRS in a common subframe and transmits at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

31. The apparatus of claim 21, further comprising:

means for determining if different TAs for a sounding reference signal (SRS) channel and physical uplink shared channel (PUSCH) to be transmitted in a common subframe differ by a threshold amount; and

means for, if so, erasing at least a portion of one of the SRS channel or the PUSCH.

32. The method of claim 31, further comprising means for receiving signaling indicating whether to erase at least a portion of the SRS channel or the PUSCH.

22. The apparatus of claim 22, wherein:

the multiple TAs comprise TAs for different channels of different cells.

33. An apparatus for wireless communications, comprising:

means for determining multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

means for transmitting signaling indicating the multiple timing adjustments (TAs) to the UE.

34. The apparatus of claim 33, wherein:

the multiple TAs comprise TAs for different channels of different cells.

35. The apparatus of claim 34, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

36. The apparatus of claim 33, wherein the TAs comprise different TAs for different channels on different subframes.

37. The apparatus of claim 36, wherein:

the different uplink channels comprise at least a sounding reference signal (SRS) channel and at least one of a physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH).

38. The apparatus of claim 37, wherein the UE applies a single one of the multiple TAs when transmitting both SRS and at least one of the PUSCH or PUCCH.

39. The apparatus of claim 38, further comprising:

means for processing received signals in a manner that accounts for the UE applying a single one of the multiple TAs.

40. The apparatus of claim 39, further comprising:

means for transmitting signaling to the UE indicating whether the UE should erase a portion of a sounding reference signal (SRS) channel or a portion of a physical uplink shared channel (PUSCH) if the UE has been provided different TAs for the SRS channel and PUSCH to be transmitted in a common subframe.

41. An apparatus for wireless communication, comprising:

at least one processor configured to receive signaling indicating multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points, and apply at least one of the multiple TAs when transmitting on at least one of the uplink channels; and

a memory coupled with the at least one processor.

42. An apparatus for wireless communication, comprising:

at least one processor configured to determine multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points, and transmit signaling indicating the multiple timing adjustments (TAs) to the UE; and

a memory coupled with the at least one processor.

43. A program product comprising a computer readable medium having instructions stored thereon, the instructions generally executable by one or more processors for:

receiving signaling indicating multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

applying at least one of the multiple TAs when transmitting on at least one of the uplink channels.

44. A program product comprising a computer readable medium having instructions stored thereon, the instructions generally executable by one or more processors for:

determining multiple timing adjustments (TAs) for different uplink channels between the user equipment (UE) and one or more transmission points; and

transmitting signaling indicating the multiple timing adjustments (TAs) to the UE.