Method for transmitting control information and apparatus for the same

• US 9,876,882 B2
• Filed: 01/03/2017
• Issued: 01/23/2018
• 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:
  US15/397,453
• Publication Number:
  US 20170118316A1
• Time in Patent Office: 385 Days
• 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

A method for transmitting data in a wireless local area network, the method comprising: receiving, by a receiving station, a physical layer protocol data unit (PPDU) from a transmitting station, the PPDU including a signal-A field, the signal-A field including a bandwidth in which the PPDU is received, decoding the PPDU, wherein, when the PPDU is used for single-user (SU) transmission, the PPDU is decoded with assuming that the PPDU does not include a signal-B field, and, when the PPDU is used for multi-user (MU) transmission, the PPDU is decoded with assuming that the PPDU include the signal-B field, and wherein the signal-B field includes a modulation and coding scheme (MCS) used for the receiving station.

Claims

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

receiving, by a receiving station, a physical layer protocol data unit (PPDU) from a transmitting station, the PPDU including a first signal field, the first signal field including a bandwidth in which the PPDU is received;

decoding the PPDU,

wherein, when the PPDU is used for single-user (SU) transmission, the PPDU is decoded by assuming that the PPDU does not include a second signal field, and, when the PPDU is used for multi-user (MU) transmission, the PPDU is decoded by assuming that the PPDU includes the second signal field,

wherein the second signal field includes a modulation and coding scheme (MCS) used for the receiving station, and

wherein a size of the second signal field is determined based on the bandwidth indicated by the first signal field.

2. The method of claim 1, wherein the PPDU further includes a long training symbol (LTF) for multiple-input multiple-output (MIMO) channel estimation, and

wherein the first signal field includes information on a guard interval of the LTF.

3. The method of claim 1, wherein the first signal field further includes information on at least one spatial stream allocated to the receiving station.

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 receive a physical layer protocol data unit (PPDU) from a transmitting station, the PPDU including a first signal field, the first signal field including a bandwidth in which the PPDU is received,

decode the PPDU,

wherein, when the PPDU is used for single-user (SU) transmission, the PPDU is decoded by assuming that the PPDU does not include a second signal field, and, when the PPDU is used for multi-user (MU) transmission, the PPDU is decoded by assuming that the PPDU includes the second signal field,

wherein the second signal field includes a modulation and coding scheme (MCS) used for the device, and

wherein a size of the second signal field is determined based on the bandwidth indicated by the first signal field.

5. The device of claim 4, wherein the PPDU further includes a long training symbol (LTF) for multiple-input multiple-output (MIMO) channel estimation, and

wherein the first signal field includes information on a guard interval of the LTF.

6. The device of claim 4, wherein the first signal field further includes information on at least one spatial stream allocated to the device.