Methods of Channel State Information Feedback and Transmission in Coordinated Multi-Point Wireless Communications System

• US 20130039349A1
• Filed: 07/10/2012
• Published: 02/14/2013
• Est. Priority Date: 08/12/2011
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Ebrahimi Tazeh Mahalleh, Masoud, Gao, Shiwei, Jia, Yongkang, Tabet, Tarik, Xu, Hua
• Granted Patent: US 9,025,574 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 25/03955 in combination with downlink estimations, e.g. downlink path losses
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor

Abstract

An apparatus and method for feedback solutions that function in conjunction with CoMP transmissions. The feedback solutions are applicable to joint transmission (JT) as well as coordinated scheduling (CS) and coordinated beamforming (CB). Embodiments of the present disclosure are described herein in the context of a wireless network in compliance with LTE standards.

Claims

1-26. -26. (canceled)

27. A method for configuring a feedback scheme, the feedback scheme function in conjunction with coordinated multiple-point (CoMP) transmissions in a wireless system with the plurality of transmission points, the method comprising:

configuring a wireless device to support feedback of one of a common rank indicator (RI) for all of a plurality of transmission points and a separate rank indicator for each of the plurality of transmission points; and

configuring the wireless device to support feedback of a Precoding Matrix Indicator (PMI) report for each of the plurality of transmission points; and

defining at least one of a separate Channel Quality Indicator (CQI) report for each of the plurality of transmission points, a common CQI report and both separate CQI and common CQI reports; and

wherein

the RI report, the separate CQI/PMI report and the common CQI report are fed back to a node B via a single transmission point.

28. The method of claim 27 further comprising:

transmitting one of the common RI report and the RI report for each of the plurality of transmission points, the PMI reports, and the at least one of the CQI report for each of the plurality of transmission points and the common CQI report via at least one of a Physical Uplink Control Channel (PUCCH) and a Physical Uplink Shared Channel (PUSCH); and

wherein

when at least one of the RI reports and the common RI report, the PMI reports, at least one of the CQI reports and the common CQI report are transmitted in PUCCH, different reports are transmitted in different subframes in a Time Division Multiplexed (TDM) manner; and

,

when at least one of RI reports, PMI reports, the CQI reports, and the common CQI report are transmitted in PUCCH, and at least one of RI reports, PMI reports, the CQI reports, and the common CQI report are transmitted in PUSCH.

29. The method of claim 27 wherein:

the RI for each of a plurality of transmission points is jointly encoded and transmitted in the same RI report.

30. The method of claim 27 further comprising:

extending at least one of PUCCH and PUSCH feedback modes for closed-loop transmission, the extended feedback modes corresponding to 3GPP release 8 feedback modes 1-1, 2-1 for PUCCH, and modes 3-1, 1-2 and 2-2 for PUSCH.

31. The method of claim 27 further comprising:

extending at least one of PUCCH and PUSCH feedback modes for open-loop transmission, the extended feedback modes corresponding to 3GPP release 8 feedback modes 1-0, 2-0 for PUCCH, and modes 2-0, 3-0 and 2-2 for PUSCH.

32. The method of claim 30 wherein:

joint CQI reports are derived and fed-back for at least one of the extended feedback modes.

33. The method of claim 30, wherein the feedback reports for different TPs are transmitted in an alternating manner in different subframes in the extended PUCCH feedback modes.

34. The method of claim 30, wherein the same type of feedback reports for different TPs are combined and transmitted in the same report in the extended PUCCH feedback modes.

35. The method of claim 32 wherein:

for selected sub-band reporting, selection of a best-M sub-bands is based on joint CQI from the plurality of transmission points rather than individual CQI for each transmission point.

36. The method of claim 35 wherein:

for selected sub-band reporting, a UE derives and feeds back separate CQI/PMI reporting for each transmission point based on selected sub-bands but assumes individual transmission from each transmission points.

37. The method of claim 36 wherein:

for selected sub-band reporting, the UE derives and feeds back joint CQIs for each selected sub-band by assuming joint transmission from all participating transmission points.

38. (canceled)

39. (canceled)

40. A method for configuring a transmission mode that functions in conjunction with CoMP transmissions comprising:

configuring a wireless device to support a spatial multiplexing (SM) coordinated multiple-point (CoMP) transmission mode, the transmission mode supporting feedback configuration of, rank indication (RI) reporting, separate Channel Quality Indicator/Precoding Matrix Indicator (CQI/PMI) reporting for each of a plurality of transmission points, the transmission mode supporting dynamic switching between CoMP and non-CoMP transmission; and

switching between closed-loop and open-loop SM transmission, and

configuring a joint CQI feedback.

41. The method of claim 40 further comprising:

supporting a closed-loop spatial multiplexing CoMP transmission, the closed-loop spatial multiplexing CoMP transmission mode requires the feedback of precoding matrix indicator PMI feedback from the UE.

42. The method of claim 40 further comprising:

supporting an open-loop spatial multiplexing CoMP transmission, the open-loop spatial multiplexing CoMP transmission does not need precoding matrix indicator PMI feedback from the UE.

43. The method of claim 42 wherein:

at least one of pre-defined precoding vectors and eNB determined precoding vectors are applied at the transmission points.

44. The method of claim 40 wherein:

the UE is be configured with different feedback modes to achieve a switch between the closed-loop and open-loop spatial multiplexing CoMP transmissions.

45. The method of claim 44 wherein:

when the UE is configured with CQI only feedback, the open-loop transmission is used;

when the UE is configured with PMI/CQI feedback, the closed-loop transmission is used.

46. The method of claim 40 further comprising:

supporting a single downlink control indicator (DCI) format as defined in 3GPP release 10 for transmission mode 9.

47. (canceled)

48. (canceled)

49. A method for configuring a transmission that functions in conjunction with CoMP transmissions comprising:

applying transmit diversity transmission from at least one transmission point, wherein

if two transmission points are involved, the transmit diversity applies an Alamouti type of encoding to generate pairs of coded symbols, the pairs of coded symbols being transmitted from each transmission point.

50. The method of claim 49 wherein:

a CQI calculation at the UE feedback assumes that Alamouti coding is used.

51. The method of claim 49 wherein:

transmit diversity transmission could be assumed as the fall-back transmission for SM transmission in 14.

52-61. -61. (canceled)