Method and apparatus for E-TFC selection for uplink MIMO communication

• US 9,055,604 B2
• Filed: 02/06/2013
• Issued: 06/09/2015
• Est. Priority Date: 02/08/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhang, Danlu, Sambhwani, Sharad Deepak, Bharadwaj, Arjun, Agarwal, Ravi, Akkarakaran, Sony J.
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): LOPATA, ROBERT J
• Application Number:
  US13/760,275
• Publication Number:
  US 20130201816A1
• Time in Patent Office: 853 Days
• Field of Search: 370/216, 370/310, 370/328, 370/329
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

One or more scheduling grants may be received from a Node B related to a plurality of uplink MIMO streams. A determination may be made as to a primary transport power and a primary transport block size for a primary stream. A secondary transmit power and a secondary transport block size for a secondary stream may also be determined.

Claims

1. A method for communicating using multiple-input multiple-output (MIMO) in a wireless network, comprising:

receiving one or more scheduling grants from a Node B relating to a plurality of uplink streams in MIMO;

determining a primary transmit power and a primary transport block size (TBS) for a primary stream of the plurality of uplink streams;

determining a secondary transmit power and a secondary TBS for a secondary stream of the plurality of uplink streams; and

selecting an enhanced traffic format combination (E-TFC) for transmitting over a configuration of the plurality of uplink streams based on the one or more scheduling grants, wherein the E-TFC has a set of associated states indicating whether a plurality of possible payloads are each supported or blocked over the configuration of the plurality of uplink streams, wherein the determining the primary TBS and the secondary TBS is based in part on the set of associated states,

wherein the set of associated states comprise;

a first state indicating whether the E-TFC is supported on the primary stream when both the primary stream and the secondary stream are transmitted;

a second state indicating whether the E-TFC is supported on the secondary stream; and

a third state indicating whether the E-TFC is supported on the primary stream when only the primary stream is transmitted.

2. The method of claim 1, wherein if the secondary stream is not transmitted, the power allocated to the secondary stream is usable by the primary stream.

3. The method of claim 1, wherein if the secondary stream is not transmitted, the power allocated to the secondary stream is not usable by the primary stream.

4. The method of claim 1, further comprising determining to transmit data over the primary stream and not the secondary stream, wherein the set of associated states indicates the secondary stream is blocked.

5. The method of claim 4, wherein the set of associated states indicates the secondary stream is blocked based on a determination that the secondary TBS is less than a minimum secondary TBS for the secondary stream.

6. The method of claim 4, further comprising transmitting a secondary pilot for the secondary stream at a power which is offset to a pilot power of the primary stream.

7. The method of claim 1, further comprising maintaining a minimum E-TFC set for the primary stream wherein all of the E-TFCs in the minimum E-TFC set are supported.

8. The method of claim 1, further comprising transmitting data for the secondary stream on a hybrid automatic repeat/request (HARQ) index k+N, where k is a HARQ index for the primary stream, and N is a number of HARQ processes in a frame.

9. The method of claim 8, wherein the retransmitting the data for the primary stream uses the same TBS.

10. The method of claim 8, further comprising transmitting new data over the primary stream while retransmitting the data for the secondary stream, wherein the retransmitting the data for the secondary stream uses the same secondary TBS.

11. The method of claim 8, further comprising updating the scheduled grant for at least the secondary stream based on the retransmitting.

12. The method of claim 8, further comprising applying hybrid automatic repeat/request (HARQ) interlace activation or deactivation for the primary stream and the secondary stream.

13. The method of claim 8, further comprising receiving a primary serving grant update for the primary stream related to the data retransmitted over HARQ index k+N, and a secondary serving grant update for the secondary stream related to other data retransmitted over HARQ index k.

14. The method of claim 13, further comprising:

determining that the secondary stream is smaller than a minimum TBS; and

applying a zero grant to the secondary stream.

15. The method of claim 1, further comprising applying a non-scheduled grant across the primary stream and the secondary stream.

16. The method of claim 15, wherein the applying comprises allocating a portion of the non-scheduled grant up to the primary TBS to the primary stream before allocating a remaining portion of the non-scheduled grant to the secondary stream.

17. The method of claim 15, wherein the determining the primary transmit power for the primary stream is based on the portion of the non-scheduled grant, and the determining the secondary transmit power for the secondary stream is based on the remaining portion of the non-scheduled grant.

18. The method of claim 1, further comprising:

determining to transmit data over the primary stream and applying the same power to the secondary stream; and

implementing power scaling on the primary stream.

19. The method of claim 1, further comprising:

determining to transmit data over the primary stream and the secondary stream;

computing a power need for each of the primary stream and the secondary stream; and

implementing power scaling based on the computed power need.

20. The method of claim 19, further comprising:

giving priority to one of the primary stream or the secondary stream that is performing a retransmission.

21. The method of claim 19, further comprising:

giving equal priority to the primary stream and the secondary stream.

22. The method of claim 19, further comprising:

computing the power need for both the primary stream and the secondary stream based on at least one of a T2P/TBS of a retransmission on the primary stream and a related scheduling grant on the primary stream.

23. The method of claim 19, wherein implementing the power scaling is based on the larger power across the primary stream and the secondary stream.

24. The method of claim 23, wherein implementing the power scaling comprising:

computing a power scaling for the primary stream based on the T2P/TBS for retransmission or on a related scheduling grant;

computing a power scaling for the secondary stream based on the T2P/TBBS of a scheduling grant for a new transmission or based on a previous power or previous scheduling grant when the data started for a retransmission; and

selecting a maximum of the computed power scaling for the primary stream and the computed power scaling of the secondary stream as the power scaling for both streams.

25. An apparatus for communicating using multiple-input multiple-output (MIMO) in a wireless network, comprising:

means for receiving one or more scheduling grants from a Node B relating to a plurality of uplink streams in MIMO;

means for determining a primary transmit power and a primary transport block size (TBS) for a primary stream of the plurality of uplink streams;

means for determining a secondary transmit power and a secondary TBS for a secondary stream of the plurality of uplink streams; and

means for selecting an enhanced traffic format combination (E-TFC) for transmitting over a configuration of the plurality of uplink streams based on the one or more scheduling grants, wherein the E-TFC has a set of associated states indicating whether a plurality of possible payloads are each supported or blocked over the configuration of the plurality of uplink streams, wherein the determining the primary TBS and the secondary TBS is based in part on the set of associated states,

wherein the set of associated states comprise;

a first state indicating whether the E-TFC is supported on the primary stream when both the primary stream and the secondary stream are transmitted;

a second state indicating whether the E-TFC is supported on the secondary stream; and

a third state indicating whether the E-TFC is supported on the primary stream when only the primary stream is transmitted.

26. A non-transitory computer-readable medium for communicating using multiple-input multiple-output (MIMO) in a wireless network comprising code for causing a computer to:

receive one or more scheduling grants from a Node B relating to a plurality of uplink streams in MIMO;

determine a primary transmit power and a primary transport block size (TBS) for a primary stream of the plurality of uplink streams;

determine a secondary transmit power and a secondary TBS for a secondary stream of the plurality of uplink streams; and

select an enhanced traffic format combination (E-TFC) for transmitting over a configuration of the plurality of uplink streams based on the one or more scheduling grants, wherein the E-TFC has a set of associated states indicating whether a plurality of possible payloads are each supported or blocked over the configuration of the plurality of uplink streams, wherein the determining the primary TBS and the secondary TBS is based in part on the set of associated states,

wherein the set of associated states comprise;

a first state indicating whether the E-TFC is supported on the primary stream when both the primary stream and the secondary stream are transmitted;

a second state indicating whether the E-TFC is supported on the secondary stream; and

a third state indicating whether the E-TFC is supported on the primary stream when only the primary stream is transmitted.

27. An apparatus for communicating using multiple-input multiple-output (MIMO) in a wireless network, comprising:

at least one processor configured to;

receive one or more scheduling grants from a Node B relating to a plurality of uplink streams in MIMO;

determine a primary transmit power and a primary transport block size (TBS) for a primary stream of the plurality of uplink streams;

determine a secondary transmit power and a secondary TBS for a secondary stream of the plurality of uplink streams; and

select an enhanced traffic format combination (E-TFC) for transmitting over a configuration of the plurality of uplink streams based on the one or more scheduling grants, wherein the E-TFC has a set of associated states indicating whether a plurality of possible payloads are each supported or blocked over the configuration of the plurality of uplink streams, wherein the determining the primary TBS and the secondary TBS is based in part on the set of associated states,

wherein the set of associated states comprise;

a first state indicating whether the E-TFC is supported on the primary stream when both the primary stream and the secondary stream are transmitted;

a second state indicating whether the E-TFC is supported on the secondary stream; and

a third state indicating whether the E-TFC is supported on the primary stream when only the primary stream is transmitted.

28. The apparatus of claim 27, wherein if the secondary stream is not transmitted, the power allocated to the secondary stream is usable by the primary stream.

29. The apparatus of claim 27, wherein if the secondary stream is not transmitted, the power allocated to the secondary stream is not usable by the primary stream.

30. The apparatus of claim 27, wherein the at least one processor is further configured to determine to transmit data over the primary stream and not the secondary stream, wherein the set of associated states indicates the secondary stream is blocked.

31. The apparatus of claim 30, wherein the set of associated states indicates the secondary stream is blocked based on a determination that the secondary TBS is less than a minimum secondary TBS for the secondary stream.

32. The apparatus of claim 30, wherein the at least one processor is further configured to transmit a secondary pilot for the secondary stream at a power which is offset to a pilot power of the primary stream.

33. The apparatus of claim 27, wherein the at least one processor is further configured to maintain a minimum E-TFC set for the primary stream wherein all of the E-TFCs in the minimum E-TFC set are supported.

34. The apparatus of claim 27, wherein the at least one processor is further configured to transmit data for the secondary stream on a hybrid automatic repeat/request (HARQ) index k+N, where k is a HARQ index for the primary stream, and N is a number of HARQ processes in a frame.

35. The apparatus of claim 34, wherein the retransmitting the data for the primary stream uses the same TBS.

36. The apparatus of claim 34, wherein the at least one processor is further configured to transmit new data over the primary stream while retransmitting the data for the secondary stream, wherein the retransmitting the data for the secondary stream uses the same secondary TBS.

37. The apparatus of claim 34, wherein the at least one processor is further configured to update the scheduled grant for at least the secondary stream based on the retransmitting.

38. The apparatus of claim 34, wherein the at least one processor is further configured to apply hybrid automatic repeat/request (HARQ) interlace activation or deactivation for the primary stream and the secondary stream.

39. The apparatus of claim 34, wherein the at least one processor is further configured to receive a primary serving grant update for the primary stream related to the data retransmitted over HARQ index k+N, and a secondary serving grant update for the secondary stream related to other data retransmitted over HARQ index k.

40. The apparatus of claim 39, wherein the at least one processor is further configured to:

determine that the secondary stream is smaller than a minimum TBS; and

apply a zero grant to the secondary stream.

41. The apparatus of claim 27, wherein the at least one processor is further configured to apply a non-scheduled grant across the primary stream and the secondary stream.

42. The apparatus of claim 41, wherein the applying comprises allocating a portion of the non-scheduled grant up to the primary TBS to the primary stream before allocating a remaining portion of the non-scheduled grant to the secondary stream.

43. The apparatus of claim 41, wherein the determining the primary transmit power for the primary stream is based on the portion of the non-scheduled grant, and the determining the secondary transmit power for the secondary stream is based on the remaining portion of the non-scheduled grant.

44. The apparatus of claim 27, wherein the at least one processor is further configured to:

determine to transmit data over the primary stream and applying the same power to the secondary stream; and

implement power scaling on the primary stream.

45. The apparatus of claim 27, wherein the at least one processor is further configured to:

determine to transmit data over the primary stream and the secondary stream;

compute a power need for each of the primary stream and the secondary stream; and

implement power scaling based on the computed power need.

46. The apparatus of claim 45, wherein the at least one processor is further configured to:

give priority to one of the primary stream or the secondary stream that is performing a retransmission.

47. The apparatus of claim 45, wherein the at least one processor is further configured to:

give equal priority to the primary stream and the secondary stream.

48. The apparatus of claim 45, wherein the at least one processor is further configured to:

compute the power need for both the primary stream and the secondary stream based on at least one of a T2P/TBS of a retransmission on the primary stream and a related scheduling grant on the primary stream.

49. The apparatus of claim 45, wherein implementing the power scaling is based on the larger power across the primary stream and the secondary stream.

50. The apparatus of claim 49, wherein when implementing the power scaling the at least one processor is further configured to:

compute a power scaling for the primary stream based on the T2P/TBS for retransmission or on a related scheduling grant;

compute a power scaling for the secondary stream based on the T2P/TBBS of a scheduling grant for a new transmission or based on a previous power or previous scheduling grant when the data started for a retransmission; and

select a maximum of the computed power scaling for the primary stream and the computed power scaling of the secondary stream as the power scaling for both streams.