Method for transmitting control information and apparatus for the same

• US 9,071,491 B2
• Filed: 03/27/2014
• Issued: 06/30/2015
• 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): KASSA, ZEWDU A
• Application Number:
  US14/227,353
• Publication Number:
  US 20140241451A1
• Time in Patent Office: 460 Days
• Field of Search: 375/267, 375/260, 375/259
• 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 the 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 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,

wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix,

wherein the first LTF and the VHT SIG-A field are not applied by the mapping matrix, and

wherein the VHT-SIG-B field is mapped to the at least one spatial stream based on a single column vector and the mapping matrix.

2. The method of claim 1, wherein the single column vector is determined based on a number of the at least one spatial stream.

3. The method of claim 2, wherein the VHT-SIG-A field includes information indicating the number of the at least one spatial stream.

4. 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 first long training field (LTF) to a receiver;

instruct the transceiver to transmit a very high throughput (VHT)-SIG-A field to the receiver;

instruct the transceiver to transmit a second LTF for multiple input multiple output (MIMO) channel estimation to the receiver;

instruct the transceiver to transmit a VHT-SIG-B field to the receiver; and

instruct the transceiver to transmit 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,

wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix,

whererin the first LTF and the VHT SIG-A field are not applied by the mapping matrix, and

wherein the VHT-SIG-B field is mapped to the at least one spatial stream based on a single column vector and the mapping matrix.

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

6. The device of claim 5, wherein the VHT-SIG-A field includes information indicating the number of the at least one spatial stream.

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

receiving, by a receiver, a first long training field (LTF) from to a transmitter;

receiving, by the receiver, a very high throughput (VHT)-SIG-A field from the transmitter;

receiving, by the receiver, a second LTF for multiple input multiple output (MIMO) channel estimation from the transmitter;

receiving, by the receiver, a VHT-SIG-B field from the transmitter; and

receiving, by the receiver, a data field from the transmitter,

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

wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix,

wherein the first LTF and the VHT SIG-A field are not applied by the mapping matrix, and

wherein the VHT-SIG-B field is mapped to the at least one spatial stream based on a single column vector and the mapping matrix.

8. 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 first long training field (LTF) from a transmitter;

instruct the transceiver to receive a very high throughput (VHT)-SIG-A field from the transmitter;

instruct the transceiver to receive a second LTF for multiple input multiple output (MIMO) channel estimation from the transmitter;

instruct the transceiver to receive a VHT-SIG-B field from the transmitter; and

instruct the transceiver to receive a data field from the transmitter,

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

wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix,

wherein the first LTF and the VHT SIG-A field are not applied by the mapping matrix, and

wherein the VHT-SIG-B field is mapped to the at least one spatial stream based on a single column vector and the mapping matrix.