METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A MIMO SYSTEM

• US 20140119327A1
• Filed: 01/03/2014
• Published: 05/01/2014
• Est. Priority Date: 03/12/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: OH, Jong-Ee, CHEONG, Minho, LEE, Sok-Kyu
• Granted Patent: US 9,900,067 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently.

Claims

1. A method for wireless local area network, the method comprising,

receiving, by a receiver, a first signal field over an operating band in two orthogonal frequency division multiplexing (OFDM) symbols, a bandwidth of the operating band being a multiple of 20 MHz;

and

receiving, by the receiver, a second signal field over the operating band in one OFDM symbol for a multi user multiple input multiple output (MU-MIMO) transmission,

wherein the second signal field includes information that is obtained by repeating a SIG-B a predetermined number of times in accordance with the bandwidth of the operating band,

wherein the predetermined number of times increases as the bandwidth of the operating band increases,

wherein the first signal signal includes first information common to a plurality of receivers that are destined for the MU-MIMO transmission and the SIG-B includes second information specific to the receiver and,

wherein the second signal field is received via at least one spatial stream selected from a plurality of spatial streams, the at least one spatial stream corresponding to the receiver.

2. The method of claim 1, wherein the first signal field is received without applying the MU-MIMO transmission.

3. The method of claim 1, wherein the first signal field is repeatedly transmitted over each 20 MHz bandwidth of the operating band.

4. The method of claim 1, wherein the first signal field includes a Very High Throughput Signal A (VHT-SIG-A) field and the second signal field includes VHT Signal B (VHT-SIG-B) field.

5. The method of claim 1, wherein a bit number of the SIG-B is 26 bits if the bandwidth of the operating band is 20 MHz.

6. The method of claim 1, wherein a bit number of the SIG-B is 27 bits if the bandwidth of the operating band is 40 MHz.

7. The method of claim 1, wherein a bit number of the SIG-B is 29 bits if the bandwidth of the operating band is larger than 40 MHz.

8. The method of claim 1, further comprising:

receiving a data field, the data field including a cyclic redundancy check (CRC) field used for detecting an error of the second signal field.

9. The method of claim 8, wherein the first signal field, the second field and the data field are transmitted as a physical layer convergence procedure (PLCP) protocol data unit (PPDU).

10. An apparatus for wireless local area network, the apparatus comprising:

a reception unit configured to;

receive a first signal field over an operating band in two orthogonal frequency division multiplexing (OFDM) symbols, a bandwidth of the operating band being a multiple of 20 MHz; and

receive a second signal field over the operating band in one OFDM symbol for a multi user multiple input multiple output (MU-MIMO) transmission,

a data obtaining unit configured to obtain data based on the first signal field and a second signal field,

wherein the second signal field includes information that is obtained by repeating a SIG-B a predetermined number of times in accordance with the bandwidth of the operating band,

wherein the predetermined number of times increases as the bandwidth of the operating band increases,

wherein the first signal field includes first information common to a plurality of receivers that are destined for the MU-MIMO transmission and the SIG-B includes second information specific to the apparatus,

wherein the second signal field is received via at least one spatial stream selected from a plurality of spatial streams, the at least one spatial stream corresponding to the apparatus.

11. The apparatus of claim 10, wherein the first signal field is received without applying the MU-MIMO transmission.

12. The apparatus of claim 10, wherein the first signal field is repeatedly transmitted over each 20 MHz bandwidth of the operating band.

13. The apparatus of claim 10, wherein the first signal field includes a Very High Throughput Signal A (VHT-SIG-A) field and the second signal field includes VHT Signal B (VHT-SIG-B) field.