Method for supporting various multi-antenna schemes in BWA system using multiple antennas

• US 20060098568A1
• Filed: 11/08/2005
• Published: 05/11/2006
• Est. Priority Date: 11/09/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Maeng, Seung-Joo, Jeong, Hong-Sil, Jeon, Jae-Ho, Chae, Chan-Byoung, Ko, Kyun-Byoung, Oh, Jeong-Tae, Yun, Sung-Ryul, Roh, Won-Il
• Granted Patent: US 7,660,607 B2
• Time in Patent Office: Days
• US Class Current: 370/206
• CPC Class Codes: H04B 7/0417 Feedback systems
• 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 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• 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
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 1/0662 Limited orthogonality systems
• CPC Class Codes: H04L 1/0668 Orthogonal systems, e.g. using Alamouti codes
• CPC Class Codes: H04L 1/0687 Full feedback

Abstract

Disclosed is a method for using various multiple antenna schemes in a baseband wireless access system is provided. According to the method, a downlink MAP message is constructed in order to support various multiple antenna schemes based on a multiple-input multiple output (MIMO), which is one of the multiple antenna schemes, so that compatibility with exiting MIMO technology having no MIMO feedback can be achieved and overhead occurring in transmission of an MAP information element can be reduced. Further, it is possible to efficiently support spatial multiplexing technology capable of transmitting multiple layers having different modulation and coding in a MIMO system.

Claims

1. A method for supporting various Multiple Input Multiple Output (MIMO) and precoding technologies in a Broadband Wireless Access (BWA) system employing an antenna technique of a MIMO scheme, the method comprising the steps of:

configuring a downlink MAP message including information fields for indicating the MIMO technology and information fields for indicating various precoding technologies; and

applying the MIMO technology to a mobile station by means of the downlink MAP message.

2. The method as claimed in claim 1, wherein the downlink MAP message includes a field representing coding and modulation information according to layers and a field list information for Channel Quality Information (CQI) allocation.

3. The method as claimed in claim 2, wherein the downlink MAP message includes a field representing a number of streams output from a Space Time Coding (STC) encoder, and indicates applicable MIMO technology in the field representing the coding and modulation information.

4. The method as claimed in claim 3, wherein the downlink MAP message includes a field for indicating if a supportable mode has changed, and indicates a type of the STC encoder through a number of layers included in the field representing the coding and modulation information, the number of streams, and a value of the basic information field.

5. The method as claimed in claim 1, wherein the step of applying the MIMO technology comprises the sub-steps of:

determining MIMO technology to be applied based on a number of layers and a number of streams designated in the downlink MAP message, when the information field for indicating various precoding technologies, which is included in the downlink MAP message, is designated as antenna grouping precoding technology;

determining MIMO technology to be applied by an antenna grouping index field designated in the downlink MAP message; and

applying the determined MIMO technology.

6. A method for supporting multiple antennas by a base station in a Broadband Wireless Access (BWA) communication system using a Multiple Input Multiple Output (MIMO) scheme, the method comprising the steps of:

receiving Channel Quality Information (CQI) from a mobile station;

determining the MIMO scheme according to the CQI;

encoding data according to the determined MIMO scheme; and

configuring a downlink MAP message including the encoded data and information used for the encoding, and transmitting the downlink MAP message.

7. The method as claimed in claim 6, wherein the MIMO scheme determines a transmission matrix according to a number of layers corresponding to a number of modulators and a number of modulation streams output from an encoder in a transmitter of the base station.

8. The method as claimed in claim 6, wherein the encoding includes one of a transmit diversity scheme, a vertical encoding scheme and a horizontal encoding scheme.

9. The method as claimed in claim 6, wherein the information used for the encoding includes information defining a number of layers corresponding to a number of modulators and a number of modulation streams output from an encoder in a transmitter of the base station, and transmits to the mobile station a downlink MAP message for indicating a transmission matrix determined by the number of layers and modulation streams.

10. The method as claimed in claim 6, wherein the information used for the encoding includes information defining a number of layers corresponding to a number of modulators and a number of modulation streams output from an encoder in a transmitter of the base station, and transmits to the mobile station a downlink MAP message for indicating antenna grouping/selection index information determined by the number of layers and modulation streams.

11. An apparatus of a base station for application of a Multiple Input Multiple Output (MIMO) scheme in a Broadband Wireless Access (BWA) communication system using the MIMO scheme, the apparatus comprising:

a first encoder for encoding data;

a modulator for mapping on a complex plane the encoded data output from the first encoder;

a second encoder for applying the MIMO scheme to the modulated data; and

a precoding block for receiving a modulation stream from the second encoder and performing precoding for the received modulation stream.

12. The apparatus as claimed in claim 11, wherein the second encoder includes a Space Time Coding (STC) encoder for performing space time coding.

13. The apparatus as claimed in claim 11, wherein the precoding block operates when receiving Channel Quality Information (CQI) fedback from a mobile station.

14. The apparatus as claimed in claim 11, wherein the MIMO scheme determines a transmission matrix according to a number of layers corresponding to a number of modulators and a number of modulation streams output from the second encoder in a transmitter of the base station.

15. The apparatus as claimed in claim 11, wherein the second encoder uses one of a transmit diversity scheme, a vertical encoding scheme and a horizontal encoding scheme.