Method for transmitting control information and apparatus for the same

• US 9,300,512 B2
• Filed: 03/27/2014
• Issued: 03/29/2016
• Est. Priority Date: 02/12/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Dae Won, Noh, Yu Jin, Kang, Byeong Woo, Seok, Yong Ho
• Primary Examiner(s): Masur, Paul H
• Application Number:
  US14/227,993
• Publication Number:
  US 20140286327A1
• Time in Patent Office: 733 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 27/28 with simultaneous transmission of different frequencies each representing one code element
• CPC Class Codes: H04L 69/323 in the physical layer [OSI layer 1]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Methods and devices for transmitting or receiving data in a wireless local area network are provided. The method in one embodiment includes transmitting, by a transmitter, a first long training field (LTF) to a receiver; transmitting, by the transmitter, a very high throughput (VHT)-SIG-A field to the receiver; transmitting, by a transmitter, a second LTF for multiple input multiple output (MIMO) channel estimation to the receiver; transmitting, by the transmitter, a VHT-SIG-B field to the receiver; and transmitting, by the transmitter, a data field to the receiver, wherein the first LTF, the VHT-SIG-A field, the second LTF, the VHT-SIG-B field and the data field are sequentially transmitted, and wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix but the first LTF and the VHT SIG-A field are not mapped to the at least one spatial stream.

Claims

1. A method for transmitting data in a wireless local area network, the method comprising:

transmitting, by a transmitter, a very high throughput (VHT)-SIG-A field in first subcarriers over first orthogonal frequency division multiplexing (OFDM) symbols to a receiver;

transmitting, by the transmitter, a VHT-SIG-B field in second subcarriers over a single second OFDM symbol to the receiver; and

transmitting, by the transmitter, a data field in third subcarriers to the receiver,

wherein the VHT-SIG-A field, the VHT-SIG-B field and the data field are sequentially transmitted,

wherein a number of the second subcarriers is greater than a number of the first subcarriers, and

wherein

the VHT-SIG-B field is applied by a single column vector and the precoding matrix,

the data field is applied by the precoding matrix, and

the VHT-SIG-A field is not applied by any of the single column vector and the precoding matrix.

2. The method of claim 1, wherein the number of the first subcarriers is 48.

3. The method of claim 1, wherein a number of the first OFDM symbols is two.

4. The method of claim 1, wherein the VHT-SIG-A field includes information indicating a number of the at least one spatial stream used for transmitting the VHT-SIG-B field and the data field.

5. The method of claim 4, wherein the single column vector is determined based on the number of the at least one spatial stream.

6. A device for a wireless local area network, the device comprising:

a transceiver configured to transmit and receive radio signals; and

a processor operatively coupled to the transceiver and configured to;

instruct the transceiver to transmit a very high throughput (VHT)-SIG-A field in first subcarrier over first orthogonal frequency division multiplexing (OFDM) symbols to a receiver;

instruct the transceiver to transmit a VHT-SIG-B field in second subcarriers over a single second OFDM symbol to the receiver; and

instruct the transceiver to transmit a data field in third subcarriers to the receiver,

wherein the VHT-SIG-A field, the VHT-SIG-B field and the data field are sequentially transmitted,

wherein a number of the second subcarriers is greater than a number of the first subcarriers, and

wherein

the VHT-SIG-B field is applied by a single column vector and the precoding matrix,

the data field is applied by the precoding matrix, and

the VHT-SIG-A field is not applied by any of the single column vector and the precoding matrix.

7. The device of claim 6, wherein the number of the first subcarriers is 48.

8. The device of claim 6, wherein a number of the first OFDM symbols is two.

9. The device of claim 6, wherein the VHT-SIG-A field includes information indicating a number of the at least one spatial stream used for transmitting the VHT-SIG-B field and the data field.

10. The device of claim 9, wherein the single column vector is determined based on the number of the at least one spatial stream.

11. A method for receiving data in a wireless local area network, the method comprising:

receiving, by a receiver, a very high throughput (VHT)-SIG-A field in first subcarrier over first orthogonal frequency division multiplexing (OFDM) symbols from a transmitter;

receiving, by the receiver, a VHT-SIG-B field in second subcarriers over a single second OFDM symbol from the transmitter; and

receiving, by the receiver, a data field in third subcarriers from the transmitter,

wherein the VHT-SIG-A field, the VHT-SIG-B field and the data field are sequentially received,

wherein a number of the second subcarriers is greater than a number of the first subcarriers, and

wherein

the VHT-SIG-B field is applied by a single column vector and the precoding matrix,

the data field is applied by the precoding matrix, and

the VHT-SIG-A field is not applied by any of the single column vector and the precoding matrix.

12. A device for a wireless local area network, the device comprising:

a transceiver configured to transmit and receive radio signals; and

a processor operatively coupled to the transceiver and configured to;

instruct the transceiver to receive a very high throughput (VHT)-SIG-A field in first subcarrier over first orthogonal frequency division multiplexing (OFDM) symbols from a transmitter;

instruct the transceiver to receive a VHT-SIG-B field in second subcarriers over a single second OFDM symbol from the transmitter; and

instruct the transceiver to receive a data field in third subcarriers from the transmitter,

wherein the VHT-SIG-A field, the VHT-SIG-B field and the data field are sequentially received,

wherein a number of the second subcarriers is greater than a number of the first subcarriers, and

wherein

the VHT-SIG-B field is applied by a single column vector and the precoding matrix,

the data field is applied by the precoding matrix, and

the VHT-SIG-A field is not applied by any of the single column vector and the precoding matrix.