Data Transmission Method and Apparatus

Patent metadata

Field	Value
Publication number	US-2017207944-A1
Application number	US-201715473269-A
Country	US
Kind code	A1
Filing date	Mar 29, 2017
Priority date	Sep 30, 2014
Publication date	Jul 20, 2017
Grant date	—

Abstract

A method includes generating a preamble for a protocol version of a wireless local area network, where the preamble includes a legacy signal L-SIG field and a high efficiency signal HE-SIG field that are arranged in order, the HE-SIG field includes a first orthogonal frequency division multiplexing OFDM symbol and a second OFDM symbol that are arranged in order, and an input information bit of the first OFDM symbol is the same as that of the second OFDM symbol, and sending the preamble to a receive end device, so that the receive end device restores the preamble, and when determining that input information bits obtained after restoring the first OFDM symbol and the second OFDM symbol are the same, determines that the preamble is the preamble of the protocol version.

First claim

What is claimed is:

1 . A data transmission method, comprising:
generating a preamble for a protocol version of a wireless local area network, wherein the preamble comprises at least one of a legacy signal (L-SIG) field and a high efficiency signal (HE-SIG) field, wherein at least one of the L-SIG field or the HE-SIG field comprises four symbols including a first orthogonal frequency division multiplexing (OFDM) symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein the four symbols are arranged in order, and an input information bit of the first OFDM symbol is the same as that of the second OFDM symbol, and wherein an input information bit of the third OFDM symbol is the same as that of the fourth OFDM symbol; and sending the preamble to a receive end device.

2 . The method according to claim 1 , wherein a time domain signal of the first OFDM symbol is different from a time domain signal of the second OFDM symbol.

3 . The method according to claim 1 , wherein the generating the preamble for the protocol version of a wireless local area network comprises:
processing the input information bit using a channel encoder, an interleaver, and a first modulator to generate the first OFDM symbol; and processing the input information bit by using the channel encoder and a second modulator to generate the second OFDM symbol, wherein the first modulator and the second modulator are the same or different.

4 . The method according to claim 3 , wherein the first modulator is a binary phase-shift keying (BPSK) modulator, and the second modulator is a quaternary binary phase shift keying (QBPSK) modulator.

5 . The method according to claim 1 , wherein the generating the preamble for the protocol version of a wireless local area network comprises:
processing the input information bit by using a channel encoder, an interleaver, and a third modulator to generate the third OFDM symbol; and processing the input information bit by using the channel encoder and a fourth modulator to generate the fourth OFDM symbol, wherein the third modulator and the fourth modulator are the same or different.

6 . The method according to claim 5 , wherein the third modulator is a BPSK modulator.

7 . A data transmission method, comprising:
receiving a preamble sent by a transmit end device for a protocol version of a wireless local area network, wherein the preamble comprises at least one of a legacy signal (L-SIG) field and a high efficiency signal (HE-SIG) field, wherein at least one of the L-SIG field or the HE-SIG field comprises four symbols including a first orthogonal frequency division multiplexing (OFDM) symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein the four symbols are arranged in order, and wherein an input information bit of the second OFDM symbol is the same as that of the first OFDM symbol, and an input information bit of the third OFDM symbol is the same as that of the fourth OFDM symbol; and processing the first OFDM symbol, the second OFDM symbol, the third OFDM symbol and the fourth OFDM symbol in the preamble.

8 . The method according to claim 7 , wherein a time domain signal of the first OFDM symbol is different from a time domain signal of the second OFDM symbol.

9 . The method according to claim 7 , wherein the processing the first OFDM symbol and the second OFDM symbol comprises:
obtaining the input information bit by using a channel decoder, an de-interleaver, and a first de-modulator to parse the first OFDM symbol; and obtaining the input information bit by using the channel decoder and a second de-modulator to parse the second OFDM symbol, wherein the first de-modulator and the second de-modulator are the same or different.

10 . The method according to claim 9 , wherein the first de-modulator is a binary phase-shift keying (BPSK) de-modulator, the second de-modulator is a quaternary binary phase shift keying (QBPSK) de-modulator.

11 . The method according to claim 7 , wherein the processing the third OFDM symbol and the fourth OFDM symbol comprises:
processing the input information bit by using a channel decoder, an interleaver, and a third de-modulator to parse the third OFDM symbol; and processing the input information bit by using the channel decoder and a fourth de-modulator to parse the fourth OFDM symbol, wherein the third de-modulator and the fourth de-modulator are the same or different.

12 . The method according to claim 11 , wherein the third de-modulator is a BPSK de-modulator.

13 . A transmit end device, comprising:
a generation unit, configured to generate a preamble for a protocol version of a wireless local area network, wherein the preamble comprises one or a combination of a legacy signal (L-SIG) field and a high efficiency signal (HE-SIG) field, the L-SIG field or the HE-SIG field comprises four symbols including a first orthogonal frequency division multiplexing (OFDM) symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein the four symbols are arranged in order, and an input information bit of the first OFDM symbol is the same as that of the second OFDM symbol, and an input information bit of the third OFDM symbol is the same as that of the fourth OFDM symbol; and a sending unit, configured to send the preamble to a receive end device.

14 . The device according to claim 13 , wherein a time domain signal of the first OFDM symbol is different from a time domain signal of the second OFDM symbol.

15 . The device according to claim 13 , wherein the generation unit is configured to:
process the input information bit by using a channel encoder, an interleaver, and a first modulator to generate the first OFDM symbol; and process the input information bit by using the channel encoder and a second modulator to generate the second OFDM symbol, wherein the first modulator and the second modulator are the same or different.

16 . The device according to claim 15 , wherein the first modulator is a binary phase-shift keying (BPSK) modulator, the second modulator is a quaternary binary phase shift keying (QBPSK) modulator.

17 . The device according to claim 13 , wherein the generating unit is configured to generate the preamble for the protocol version of the wireless local area network by:
processing the input information bit by using a channel encoder, an interleaver, and a third modulator to generate the third OFDM symbol; and processing the input information bit by using the channel encoder and a fourth modulator to generate the fourth OFDM symbol, wherein the third modulator and the fourth modulator are the same or different.

18 . The device according to claim 17 , wherein the third modulator is a BPSK modulator.

19 . A receive end device, comprising:
a receiving unit, configured to receive a preamble sent by a transmit end device for a protocol version of a wireless local area network, wherein the preamble comprises one or a combination of a legacy signal (L-SIG) field and a high efficiency signal (HE-SIG) field, the L-SIG field or the HE-SIG field comprises four symbols including a first orthogonal frequency division multiplexing (OFDM) symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein the four symbols are arranged in order, and an input information bit of the second OFDM symbol is the same as that of the first OFDM symbol, and an input information bit of the third OFDM symbol is the same as that of the fourth OFDM symbol; a processing unit, configured to proc

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Jiayin
• Zhu Jun
• Liu Yalin
• Lin Yingpei

Classifications

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L9/40

  Network security protocols · CPC title

• H04L27/2608 Primary

  Electricity · mapped topic