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

Patent metadata

Field	Value
Publication number	US-11902068-B2
Application number	US-202117517795-A
Country	US
Kind code	B2
Filing date	Nov 3, 2021
Priority date	Nov 9, 2009
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

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. An apparatus, comprising:
at least one processor;
at least one memory including computer program code, the memory and the computer program code being configured to, when executed by the processor, cause the apparatus to perform at least the following:
receive a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU comprising:
a first field including a first symbol that is mapped onto a first binary phase shift keying (BPSK) constellation;
a second field including a second symbol and a third symbol immediately after the second symbol, the second symbol being mapped onto the first BPSK constellation, and the third symbol being mapped onto a second BPSK constellation and rotated by 90° counter-clockwise relative to the second symbol; and
a training field immediately after the second field,
wherein the second symbol includes an indicator indicating a Single User-Multiple Input Multiple Output (SU-MIMO) PPDU or a multi user-MIMO (MU-MIMO) PPDU, and the third symbol includes a cyclic redundancy check (CRC) for the second symbol and at least a portion of the third symbol.

2. The apparatus of claim 1 , wherein the second field is a Very High Throughput Signal (VHT-SIG) field and the PPDU omits a High Throughput Signal (HT-SIG) field between the first field and the VHT-SIG field.

3. An apparatus, comprising:
at least one processor;
at least one memory including computer program code, the memory and the computer program code being configured to, when executed by the processor, cause the apparatus to perform at least the following:
transmit a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU comprising:
a first field including a first symbol that is mapped onto a first binary phase shift keying (BPSK) constellation;
a second field including a second symbol and a third symbol immediately after the second symbol, the second symbol being mapped onto the first BPSK constellation, and the third symbol being mapped onto a second BPSK constellation and rotated by 90° counter-clockwise relative to the second symbol; and
a training field immediately after the second field,
wherein the second symbol includes an indicator indicating a Single User-Multiple Input Multiple Output (SU-MIMO) PPDU or a multi user-MIMO (MU-MIMO) PPDU, and the third symbol includes a cyclic redundancy check (CRC) for the second symbol and at least a portion of the third symbol.

4. The apparatus of claim 3 , wherein the second field is a Very High Throughput Signal (VHT-SIG) field and the PPDU omits a High Throughput Signal (HT-SIG) field between the first field and the VHT-SIG field.

5. A method of transmitting data in a wireless network, the method comprising:
mapping first data into a first field including a first symbol that is mapped onto a first binary phase shift keying (BPSK) constellation;
mapping second data into a second field including a second symbol and a third symbol immediately after the second symbol, the second symbol being mapped onto the first BPSK constellation, and the third symbol being mapped onto a second BPSK constellation and rotated by 90° counter-clockwise relative to the second symbol, wherein the second symbol includes an indicator indicating a Single User-Multiple Input Multiple Output (SU-MIMO) PPDU or a multi user-MIMO (MU-MIMO) PPDU, and the third symbol includes a cyclic redundancy check (CRC) for the second symbol and at least a portion of the third symbol; and
transmitting the first and second fields and a training field immediately after the second field.

6. The method of claim 5 , wherein the second field is a Very High Throughput Signal (VHT-SIG) field and the PPDU omits a High Throughput Signal (HT-SIG) field between the first field and the VHT-SIG field.

Assignees

• Ericsson Telefon Ab L M

Inventors

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

Classifications

• H04L27/261 Primary

  Details of reference signals · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04L1/0041

  Arrangements at the transmitter end · CPC title

• H04L1/0061

  Error detection codes · CPC title

• H04L27/22

  Demodulator circuits; Receiver circuits · CPC title