Method and apparatus for transmitting PLCP frame in wireless local area network system

Patent metadata

Field	Value
Publication number	US-8937933-B2
Application number	US-201313943572-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Nov 9, 2009
Publication date	Jan 20, 2015
Grant date	Jan 20, 2015

Abstract

A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field.

First claim

What is claimed is:

1. A method of transmitting data in a wireless local area network, performed by a transmitter, the method comprising:
mapping a signal field onto a first binary phase shift keying (BPSK) constellation;
mapping a first Very High Throughput Signal (VHT-SIG) field onto the first BPSK constellation;
mapping a second VHT-SIG field onto a second BPSK constellation;
transmitting the mapped signal field in a first Orthogonal Frequency Division Multiplex (OFDM) symbol;
transmitting the mapped first VHT-SIG field in a second OFDM symbol; and
transmitting the mapped second VHT-SIG field in a third OFDM symbol,
wherein the second OFDM symbol is contiguous with the third OFDM symbol,
wherein the second BSPK constellation is rotated by 90° counter-clockwise relative to the first BPSK constellation, and
wherein the first VHT-SIG field includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the second VHT-SIG field includes a cyclic redundancy check (CRC) for the first and second VHT-SIG fields.

2. The method of claim 1 , wherein the signal field, the first VHT-SIG field and the second VHT-SIG field are included in a physical layer convergence procedure (PLCP) header.

3. The method of claim 1 , wherein the first VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.

4. A wireless apparatus configured for transmitting data in a wireless local area network, the wireless apparatus comprising:
a frame generation unit configured for mapping a signal field onto a first binary phase shift keying (BPSK) constellation, mapping a first Very High Throughput Signal (VHT-SIG) field onto the first BPSK constellation and mapping a second VHT-SIG field onto a second BPSK constellation; and
a frame transmission unit configured for transmitting the mapped signal field in a first Orthogonal Frequency Division Multiplex (OFDM) symbol, transmitting the mapped first VHT-SIG field in a second OFDM symbol and transmitting the mapped second VHT-SIG field in a third OFDM symbol,
wherein the second OFDM symbol is contiguous with the third OFDM symbol,
wherein the second BSPK constellation is rotated by 90° counter-clockwise relative to the first BPSK constellation, and
wherein the first VHT-SIG field includes an indicator indicating Single User-Multiple Input Multiple Output (SU-MIMO) transmission or multi user-MIMO (MU-MIMO) transmission, and the second VHT-SIG field includes a cyclic redundancy check (CRC) for the first and second VHT-SIG fields.

5. The wireless apparatus of claim 4 , wherein the first VHT-SIG field further includes a multiplexing number indicating a number of spatial streams.

Assignees

• Lg Electronics Inc

Inventors

• Lee Dae Won
• Roh Dong Wook
• Kang Byeong Woo
• Seok Yong Ho
• Noh Yu Jin
• Kim Bong Hoe

Classifications

• H03M5/12

  Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code · CPC title

• H04L1/0061

  Error detection codes · CPC title

• H04L25/4904

  using self-synchronising codes, e.g. split-phase codes · CPC title

• H04L1/0041

  Arrangements at the transmitter end · CPC title

• H04W28/06

  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 title