METHOD AND APPARATUS FOR ALLOCATING FEEDBACK CHANNEL IN MULTIPLE ANTENNA COMMUNICATION SYSTEM

• US 20090190687A1
• Filed: 01/22/2009
• Published: 07/30/2009
• Est. Priority Date: 01/25/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: HWANG, Keun-Chul, YOON, Soon-Young, PARK, Sung-Woo, MOON, June
• Granted Patent: US 8,279,962 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• 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 7/0645 Variable feedback
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A method and apparatus for allocating a feedback channel in a multiple antenna communication system are provided. In a method of operating a Base Station (BS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method includes measuring a MIMO transmission environment, determining an amount of feedback according to the MIMO transmission environment, and allocating a feedback channel according to an amount of the feedback.

Claims

1. A method of operating a Base Station (BS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method comprising:

measuring a MIMO transmission environment;

determining a feedback amount according to the MIMO transmission environment; and

allocating a feedback channel according to the feedback amount.

2. The method of claim 1, wherein, the measuring of the MIMO transmission environment comprises measuring at least one of a number of Mobile Stations (MSs), a Quality of Service (QoS) of each MS, and interference.

3. A method of operating a Base Station (BS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method comprising:

measuring a number of Mobile Stations (MSs); and

if the number of MSs is greater than a preset threshold, allocating a feedback channel for a single data stream.

4. The method of claim 3, wherein, if the number of MSs is less than the preset threshold, allocating the feedback channel for a plurality of data streams.

5. A method of operating a Base Station (BS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method comprising:

measuring a Quality of Service (QoS) of a Mobile Station (MS); and

if the QoS of the MS is greater than a preset threshold, allocating a feedback channel for a single data stream.

6. The method of claim 5, wherein, if a transfer rate required by the MS is less than the preset threshold, allocating the feedback channel for a plurality of data streams.

7. A method of operating a Base Station (BS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method comprising:

measuring an interference level; and

if the interference level is greater than a present threshold, allocating a feedback channel for a single data stream.

8. The method of claim 7, wherein, if the interference level is less than the preset threshold, allocating the feedback channel for a plurality of data streams.

9. The method of claim 7, wherein the measured interference level comprises an Interference Over Thermal (IOT).

10. A method of operating a Mobile Station (MS) for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the method comprising:

allocating a feedback channel by a Base Station (BS); and

feeding back channel information depending on a MIMO transmission environment through the allocated feedback channel.

11. The method of claim 10, further comprising configuring the feedback information.

12. The method of claim 11, wherein, the configuring of the feedback information comprises:

determining a feedback format;

if the feedback format supports MU-MIMO, transmitting at least one of a Channel Quality Indicator (CQI), a column index, and a codebook index; and

transmitting additional information for dynamically operating Single User (SU)/MU-MIMO and an additional CQI for SU.

13. A Base Station (BS) apparatus for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the apparatus comprising:

a transmission environment measuring unit for measuring a MIMO transmission environment;

a feedback determining unit for determining a feedback amount according to the MIMO transmission environment; and

a feedback channel allocating unit for allocating a feedback channel according to the feedback amount.

14. The apparatus of claim 13, wherein the feedback channel allocating unit measures at least one of a number of Mobile Stations (MSs), a Quality of Service (QoS) of each MS, and interference.

15. A Base Station (BS) apparatus for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the apparatus comprising:

a transmission environment measuring unit for measuring a number of Mobile Stations (MSs); and

a feedback channel allocating unit for allocating a feedback channel for a single data stream if the number of MSs is greater than a preset threshold.

16. The apparatus of claim 15, wherein the feedback channel allocating unit allocates the feedback channel for a plurality of data streams if the number of MSs is less than the preset threshold.

17. A Base Station (BS) apparatus for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the apparatus comprising:

a transmission environment measuring unit for measuring a Quality of Service (QoS) of a Mobile Station (MS); and

a feedback channel allocating unit for allocating a feedback channel for a single data stream if the QoS of the MS is greater than a preset threshold.

18. The apparatus of claim 17, wherein the feedback channel allocating unit allocates the feedback channel for a plurality of data streams if a transfer rate required by the MS is less than the preset threshold.

19. A Base Station (BS) apparatus for allocating a feedback channel in a Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication system, the apparatus comprising:

a transmission environment measuring unit for measuring an interference environment; and

a feedback channel allocating unit for allocating a feedback channel for a single data stream if the interference level is greater than a present threshold.

20. The apparatus of claim 19, wherein the feedback channel allocating unit allocates the feedback channel for a plurality of data streams if the interference level is less than the preset threshold.

21. The apparatus of claim 19, wherein the measured interference level is an Interference Over Thermal (IOT).