Feedback to support restrictive reuse

• US 20060135169A1
• Filed: 12/22/2004
• Published: 06/22/2006
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sampath, Hemanth, Ji, Tingfang
• Granted Patent: US 7,548,752 B2
• Time in Patent Office: Days
• US Class Current: 455/447
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0222 Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

The scheduler in a base station needs CQI information from a terminal for all reuse sets every 5 ms. to decide on which re-use set to schedule a given terminal. For MIMO users, the problem is that the CQI cannot be reconstructed for all re-use sets, using the current design. Solution: (1) For Multiple Code Word MIMO users, a MIMO VCQI connection layer message enables the base station to reconstruct the MIMO-CQI for all reuse sets on a packet-by-packet basis. This will enable dynamic scheduling (RESTRICTIVE REUSE) gains. (2) For Single Code Word users, dynamic RESTRICTIVE REUSE can be obtained by changing the CQI reporting format, and also sending a MIMO-VCQI connection layer message. (3) For Single Code Word design, quasi-static scheduling gains can be obtained by sending a MIMO-VCQI connection layer message.

Claims

1. A method of providing feedback to support restrictive reuse in a single-input single-output (SISO) system, comprising:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for reuse sets other than the non-restrictive reuse set.

2. The method of claim 1, wherein the quality indicator is a CQI and the vectored quality indicator is a vectored CQI (VCQI).

3. The method of claim 1, wherein the non-restrictive reuse set is set (111).

4. The method of claim 1, wherein the quality indicator from the non-restrictive reuse set is sent after a first period of time and the vectored quality indicator is sent after a second period of time, the second period of time being longer than the first period of time.

5. The method of claim 4, wherein the first period of time is about 5 milliseconds and the second period of time is about 100 milliseconds.

6. The method of claim 1, further comprising calculating a quality indicator for all reuse sets based on the quality indicator for the non-restrictive reuse set and the vectored quality indicator.

7. The method of claim 6, further comprising scheduling a terminal in a reuse set based on the quality indicator, the vectored quality indicator, and the quality indicator for all reuse sets.

8. A method of providing feedback to support restrictive reuse in a multiple code word (MCW) multiple-input multiple-output (MIMO) system, comprising:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for at least two reuse sets other than the non-restrictive reuse set for all layers.

9. The method of claim 8, wherein the quality indicator is a CQI and the vectored quality indicator is a vectored CQI (VCQI).

10. The method of claim 8, wherein the quality indicator from the non-restrictive reuse set is sent after a first period of time and the vectored quality indicator is sent after a second period of time, the second period of time being longer than the first period of time.

11. The method of claim 8, further comprising calculating a quality indicator for all reuse sets based on the quality indicator for the non-restrictive reuse set and the vectored quality indicator.

12. The method of claim 11, further comprising scheduling a terminal in a reuse set based on the quality indicator, the vectored quality indicator, and the quality indicator for all reuse sets.

13. A method of providing feedback to support restrictive reuse in a single code word (SCW) multiple-input multiple-output (MIMO) system, comprising:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for all reuse sets other than the non-restrictive reuse set for all layers.

14. The method of claim 13, wherein the quality indicator includes two bits for rank and six bits for CQI for the non-restrictive reuse set.

15. The method of claim 14, wherein the quality indicator from the non-restrictive reuse set is sent after a first period of time and the vectored quality indicator is sent after a second period of time, the second period of time being longer than the first period of time.

16. The method of claim 14, further comprising calculating a quality indicator for all reuse sets based on the quality indicator for the non-restrictive reuse set and the vectored quality indicator.

17. The method of claim 16, further comprising scheduling a terminal in a reuse set based on the quality indicator, the vectored quality indicator, and the quality indicator for all reuse sets.

18. The method of claim 13, wherein the quality indicator includes four bits for the CQI for each rank for the non-restrictive reuse set.

19. A method of providing feedback to support restrictive reuse in a single code word (SCW) multiple-input multiple-output (MIMO) system, comprising:

sending a quality indicator for a reuse set with an optimum quality indicator for each layer; and

sending a vectored quality indicator for all reuse sets for all layers.

20. The method of claim 19, wherein the quality indicator includes two bits for rank and six bits for CQI for the reuse set.

21. An apparatus for wireless communications, comprising:

means for sending a quality indicator for a non-restrictive reuse set; and

means for, sending a vectored quality indicator for reuse sets other than the non-restrictive reuse set.

22. An apparatus for wireless communications, comprising a controller operative to:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for reuse sets other than the non-restrictive reuse set.

23. A controller in a wireless device operative to:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for reuse sets other than the non-restrictive reuse set.

24. A readable media embodying a method for wireless communications, the method comprising:

sending a quality indicator for a non-restrictive reuse set; and

sending a vectored quality indicator for reuse sets other than the non-restrictive reuse set.