METHOD AND SYSTEM FOR ADAPTIVE ALLOCATION OF FEEDBACK RESOURCES FOR CQI AND TRANSMIT PRE-CODING

• US 20080233965A1
• Filed: 09/28/2007
• Published: 09/25/2008
• Est. Priority Date: 03/21/2007
• 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, Ariyavisitakul, Sirikiat
• Granted Patent: US 8,086,242 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA

Abstract

Aspects of a method and system for adaptive allocation of feedback resources for CQI and transmit pre-coding may include assigning a bandwidth and a feedback period to one or more CQI reporting units and a bandwidth and a feedback period to one or more PMI reporting units. One or more feedback messages may be generated based at least on channel state information associated with the bandwidth and the feedback period assigned to the one or more CQI reporting units and with the bandwidth and the feedback period assigned to the one or more PMI reporting units. The bandwidth and the feedback period of the CQI reporting units and/or the PMI reporting units may be adjusted dynamically and/or adaptively. Based on the channel state information or as a function of a feedback rate, the bandwidth and/or the feedback period may be assigned.

Claims

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

assigning a bandwidth and a feedback period to one or more CQI reporting units and a bandwidth and a feedback period to one or more PMI reporting units; and

generating one or more feedback messages based at least on channel state information associated with said bandwidth and said feedback period assigned to said one or more CQI reporting units and with said bandwidth and said feedback period assigned to said one or more PMI reporting units.

2. The method according to claim 1, comprising dynamically adjusting said bandwidth and said feedback period of said CQI reporting units and/or said PMI reporting units.

3. The method according to claim 1, comprising adaptively adjusting said bandwidth and said feedback period of said CQI reporting units and/or said PMI reporting units.

4. The method according to claim 1, comprising assigning said bandwidth and/or said feedback period based on channel state information.

5. The method according to claim 1, comprising assigning said bandwidth and/or said feedback period as a function of a feedback rate.

6. The method according to claim 1, wherein said associated channel state information comprises channel measurements associated with said assigned bandwidth and said assigned feedback period.

7. The method according to claim 6, comprising processing said channel state information by averaging said channel measurements.

8. The method according to claim 6, comprising processing said channel state information by an arbitrary function of said channel measurements.

9. The method according to claim 1, wherein said one or more feedback messages for said one or more CQI reporting units comprise modulation and coding levels.

10. The method according to claim 1, wherein said one or more feedback messages for said one or more CQI reporting units comprise Signal-to-Noise-and-Interference Ratios (SINR).

11. The method according to claim 1, wherein said one or more feedback messages for said one or more PMI reporting units comprise one or more indices into a codebook.

12. The method according to claim 1, wherein said one or more feedback messages for said one or more PMI reporting units comprise one or more matrices.

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

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

assignment of a bandwidth and of a feedback period to one or more CQI reporting units and a bandwidth and a feedback period to one or more PMI reporting units; and

generation of one or more feedback messages based at least on channel state information associated with said bandwidth and said feedback period assigned to said one or more CQI reporting units and with said bandwidth and said feedback period assigned to said one or more PMI reporting units.

14. The system according to claim 13, wherein said one or more circuits dynamically adjust said bandwidth and said feedback period of said CQI reporting units and/or said PMI reporting units.

15. The system according to claim 13, wherein said one or more circuits adaptively adjust said bandwidth and said feedback period of said CQI reporting units and/or said PMI reporting units.

16. The system according to claim 13, wherein said one or more circuits assign said bandwidth and/or said feedback period based on channel state information.

17. The system according to claim 13, wherein said one or more circuits assign said bandwidth and/or said feedback period as a function of a feedback rate.

18. The system according to claim 13, wherein said associated channel state information comprises channel measurements associated with said assigned bandwidth and said assigned feedback period.

19. The system according to claim 18, wherein said one or more circuits process said channel state information by averaging said channel measurements.

20. The system according to claim 18, wherein said one or more circuits process said channel state information by an arbitrary function of said channel measurements.

21. The system according to claim 13, wherein said one or more feedback messages for said one or more CQI reporting units comprise modulation and coding levels.

22. The system according to claim 13, wherein said one or more feedback messages for said one or more CQI reporting units comprise Signal-to-Noise-and-Interference Ratios (SINR).

23. The system according to claim 13, wherein said one or more feedback messages for said one or more PMI reporting units comprise one or more indices into a codebook.

24. The system according to claim 13, wherein said one or more feedback messages for said one or more PMI reporting units comprise one or more matrices.