Method and system for best-M CQI feedback together with PMI feedback

• US 8,761,790 B2
• Filed: 04/09/2012
• Issued: 06/24/2014
• Est. Priority Date: 04/30/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kent, Mark, Erceg, Vinko, Zheng, Jun
• Primary Examiner(s): LEE, JUSTIN YE
• Application Number:
  US13/442,297
• Publication Number:
  US 20120281773A1
• Time in Patent Office: 806 Days
• Field of Search: 455/452.2, 455/69, 455/68, 455/126, 455/24, 370/395.2, 370/395.21, 370/395.3, 370/395.31, 370/395.32, 370/395.4, 370/395.41, 370/395.42, 370/395.43
• US Class Current: 455/452.2
• 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: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04

Abstract

Aspects of a method and system for best-M CQI feedback together with PMI feedback may include generating a plurality of feedback messages, which may be communicated from a mobile station to a base station, wherein at least one of the generated plurality of feedback messages may be associated with each corresponding selected one of a plurality of Channel Quality Indicator (CQI) reporting units. The at least one of the generated feedback messages may comprise CQI information and Pre-coding Matrix Index (PMI) information, which may both be associated with the selected one of the plurality of CQI reporting units. At least one other of the generated plurality of feedback messages may comprise an aggregate CQI information, which is based on one or more of the plurality of CQI reporting units.

Claims

1. A method for processing communication signals, the method comprising:

generating a plurality of feedback messages, which is communicated from a mobile station to a base station, wherein;

at least one of said generated plurality of feedback messages is associated with one of a plurality of Channel Quality Indicator (CQI) reporting units, said at least one of said generated feedback messages comprising CQI information and Pre-coding Matrix Index (PMI) information which are both associated with said one of said plurality of CQI reporting units; and

at least one other of said generated plurality of feedback message comprises an aggregate CQI information, said aggregate CQI information being based on one or more of said plurality of CQI reporting units;

determining whether a scheduled transmission corresponds to a time-frequency interval of one or more of said plurality of CQI reporting units; and

selecting at least one of a modulation type, a coding type, and a pre-coding matrix for said scheduled transmission based on said determining and at least one of CQI information and PMI information associated with said one or more of said plurality of CQI reporting units.

2. The method according to claim 1, comprising selecting at least one of said modulation type, said coding type, and said pre-coding matrix for said scheduled transmission based on at least one of said CQI information and said PMI information associated with said one or more of said plurality of CQI reporting units when said scheduled transmission corresponds to said time-frequency interval of said one or more of said plurality of CQI reporting units.

3. The method according to claim 1, comprising selecting said modulation type and said coding type based on said aggregate CQI information when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

4. The method according to claim 3, comprising generating said aggregate CQI information based on an arithmetic mean of said CQI information associated with said one or more of said plurality of CQI reporting units.

5. The method according to claim 3, comprising generating said aggregate CQI information based on an arbitrary function of channel state information.

6. The method according to claim 1, comprising selecting said pre-coding matrix based on said one or more of said plurality of CQI reporting units when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

7. The method according to claim 6, comprising generating said selected pre-coding matrix, based on interpolation between a plurality of pre-coding matrices associated with a corresponding plurality of said one or more of said plurality of CQI reporting units, when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

8. The method according to claim 7, comprising selecting said plurality of said one or more of said plurality of CQI reporting units by choosing a plurality of nearest of said one or more of said plurality of CQI reporting units to said scheduled transmission, according to a distance metric, when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

9. The method according to claim 8, wherein said distance metric is based on a difference in at least one of frequency and time.

10. The method according to claim 1, comprising selecting said pre-coding matrix from a plurality of pre-coding matrices associated with said one or more of said plurality of CQI reporting units when said scheduled transmission does not correspond to said time-frequency interval.

11. The method according to claim 10, comprising selecting said pre-coding matrix by selecting a pre-coding matrix that is associated with a nearest of said one or more of said plurality of CQI reporting units to said scheduled transmission according to a distance metric.

12. The method according to claim 11, wherein said distance metric is based on a difference in at least one of frequency and time.

13. A system for processing communication signals, the system comprising:

one or more circuits configured to;

generate a plurality of feedback messages, which is communicated from a mobile station to a base station, wherein;

at least one of said generated plurality of feedback messages is associated with one of a plurality of Channel Quality Indicator (CQI) reporting units, said at least one of said generated feedback messages comprises CQI information and Pre-coding Matrix Index (PMI) information which are both associated with said one of said plurality of CQI reporting units; and

at least one other of said generated plurality of feedback message comprising an aggregate CQI information, said aggregate CQI information being based on one or more of said plurality of CQI reporting units;

determine whether a scheduled transmission corresponds to a time-frequency interval of said one or more of said plurality of CQI reporting units; and

select at least one of a modulation type, a coding type, and a pre-coding matrix for said scheduled transmission based on said determining and on CQI information and/or PMI information associated with said one or more of said plurality of CQI reporting units.

14. The system according to claim 13, wherein said one or more circuits are configured to select said at least one of said modulation type, said coding type, and said pre-coding matrix for said scheduled transmission based on at least one of said CQI information and PMI information associated with said one or more of said plurality of CQI reporting units when said scheduled transmission corresponds to said time-frequency interval of said one or more of said plurality of CQI reporting units.

15. The system according to claim 13, wherein said one or more circuits are further configured to select said modulation type and said coding type based on said aggregate CQI information when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

16. The system according to claim 15, wherein said one or more circuits are further configured to generate said aggregate CQI information based on an arithmetic mean of said CQI information associated with said one or more of said plurality of CQI reporting units.

17. The system according to claim 15, wherein said one or more circuits are further configured to generate said aggregate CQI information based on an arbitrary function of channel state information.

18. The system according to claim 13, wherein said one or more circuits are further configured to generate said pre-coding matrix, based on interpolation between a plurality of pre-coding matrices associated with said one or more of said plurality of CQI reporting units, when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

19. The system according to claim 13, wherein said one or more circuits are further configured to select said one or more of said plurality of CQI reporting units by choosing a plurality of nearest of said one or more of said plurality of CQI reporting units to said scheduled transmission, according to a distance metric, when said scheduled transmission does not correspond to said time-frequency interval of said one or more of said plurality of CQI reporting units.

20. The system according to claim 19, wherein said distance metric is based on a difference in at least one of frequency and time.