METHOD AND SYSTEM FOR BEST-M CQI FEEDBACK TOGETHER WITH PMI FEEDBACK

• US 20080268862A1
• Filed: 09/28/2007
• Published: 10/30/2008
• 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, Zheng, Jun, Erceg, Vinko
• Granted Patent: US 8,195,184 B2
• Time in Patent Office: Days
• 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 each corresponding selected 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 selected 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 based on one or more of said plurality of CQI reporting units.

2. The method according to claim 1, comprising generating said aggregate CQI information based on an arithmetic mean of CQI information associated with said plurality of CQI reporting units.

3. The method according to claim 1, comprising generating said aggregate CQI information based on an arbitrary function of channel state information.

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

determining whether a scheduled transmission corresponds to a time-frequency interval of selected one or more Channel Quality Indicator (CQI) reporting units; and

selecting a modulation type and/or a coding type, and a pre-coding matrix, for said scheduled transmission based on said determining and on CQI information and/or Pre-coding Matrix Index (PMI) information associated with a plurality of CQI reporting units.

5. The method according to claim 4, comprising selecting said modulation type, and/or said coding type, and said pre-coding matrix, for said scheduled transmission based on CQI information and/or PMI information associated with said selected CQI reporting unit when said scheduled transmission corresponds to said time-frequency interval of said selected one or more CQI reporting unit.

6. The method according to claim 4, comprising selecting said modulation type and said coding type based on an aggregate CQI information when said scheduled transmission does not correspond to said time-frequency interval of said selected one or more CQI reporting unit.

7. The method according to claim 4, comprising selecting said pre-coding matrix based on one or more of said plurality of CQI reporting units when said scheduled transmission does not correspond to said time-frequency interval of said selected one or more CQI reporting units.

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

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

10. The method according to claim 9, wherein said distance metric is a difference in frequency and/or time.

11. The method according to claim 7, comprising selecting said pre-coding matrix from pre-coding matrices associated with said selected one or more CQI reporting units, when said scheduled transmission does not correspond to said time-frequency interval.

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

13. The method according to claim 12, wherein said distance metric is a difference in frequency and/or time.

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

one or more circuits, said one or more circuits enable;

generation of 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 each corresponding selected 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 selected 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 based on one or more of said plurality of CQI reporting units.

15. The system according to claim 14, wherein said one or more circuits generate said aggregate CQI information based on an arithmetic mean of CQI information associated with said plurality of CQI reporting units.

16. The system according to claim 14, wherein said one or more circuits generate said aggregate CQI information based on an arbitrary function of channel state information.

20. The system according to claim 14, wherein said one or more circuits select said pre-coding matrix based on one or more of said plurality of CQI reporting units when said scheduled transmission does not correspond to said time-frequency interval of said selected one or more CQI reporting units.

21. The system according to claim 20, wherein said one or more circuits generate said selected pre-coding matrix, based on interpolation between a plurality of pre-coding matrices associated with a corresponding plurality of said selected one or more CQI reporting units, when said scheduled transmission does not correspond to said time-frequency interval.

22. The system according to claim 21, wherein said one or more circuits select said plurality of said selected one or more CQI reporting units by choosing a plurality of nearest of said selected one or more CQI reporting units to said scheduled transmission, according to a distance metric, when said scheduled transmission does not correspond to said time-frequency interval.

23. The system according to claim 22, wherein said distance metric is a difference in frequency and/or time.

24. The system according to claim 20, wherein said one or more circuits select said pre-coding matrix from pre-coding matrices associated with said selected one or more CQI reporting units, when said scheduled transmission does not correspond to said time-frequency interval.

25. The system according to claim 24, wherein said one or more circuits select said pre-coding matrix by selecting a pre-coding matrix that is associated with nearest of selected one or more CQI reporting unit to said scheduled transmission, according to a distance metric.

26. The system according to claim 25, wherein said distance metric is a difference in frequency and/or time.

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

one or more circuits, said one or more circuits enable;

determination of whether a scheduled transmission corresponds to a time-frequency interval of selected one or more Channel Quality Indicator (CQI) reporting units; and

selection of a modulation type and/or a coding type, and of a pre-coding matrix, for said scheduled transmission based on said determining and on CQI information and/or Pre-coding Matrix Index (PMI) information associated with a plurality of CQI reporting units.

18. The system according to claim 17, wherein said one or more circuits select said modulation type, and/or said coding type, and said pre-coding matrix, for said scheduled transmission based on CQI information and/or PMI information associated with said selected CQI reporting unit when said scheduled transmission corresponds to said time-frequency interval of said selected one or more CQI reporting unit.

19. The system according to claim 17, wherein said one or more circuits select said modulation type and said coding type based on an aggregate CQI information when said scheduled transmission does not correspond to said time-frequency interval of said selected one or more CQI reporting unit.