Method for transmitting preamble in wireless LAN system

• US 10,454,732 B2
• Filed: 04/07/2015
• Issued: 10/22/2019
• Est. Priority Date: 08/21/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Dongguk, Chun, Jinyoung, Choi, Jinsoo, Lee, Wookbong, Cho, Hangyu, Park, Eunsung
• Primary Examiner(s): Sefcheck, Gregory B
• Assistant Examiner(s): Ulysse, Jael M
• Application Number:
  US15/504,639
• Publication Number:
  US 20170230217A1
• Time in Patent Office: 1,659 Days
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Disclosed is a method for transmitting a preamble in a wireless LAN system, and a station device for performing the same. To this end, a station for transmitting a preamble configures a wireless frame including a first type terminal frame portion, and a second type terminal frame portion. The first type terminal frame portion includes a first type terminal preamble including a first type terminal short training field (STF) and a first type terminal long training field (LTF), and the second type terminal frame portion includes a second type terminal preamble including a second type terminal SFT and a second type terminal LTF. Here, the station configures the second type terminal preamble by allocating sequence components at an interval of an integer number of tones in a frequency domain and transmits the configured wireless frame to another station.

Claims

1. A method for a first station (STA) to transmit a preamble in a wireless local area network (WLAN), the method comprising:

configuring a frame comprising a first part of the frame for a first type STA and a second part of the frame for a second type STA,

wherein the first type STA is a legacy STA in view of the second type STA,

wherein the first part of the frame comprises a STF (Short Training Field) for the first type STA and a LTF (Long Training Field) for the first type STA,

wherein the second part of the frame comprises a STF for the second type STA and a LTF for the second type STA,

wherein a first tone spacing between first tones in a frequency domain for the first part is M times larger than a second tone spacing between second tones in the frequency domain for the second part, the M being an inter greater than 1, and

wherein one or more of the STF for the second type STA and the LTF for the second type STA is configured;

by mapping each of components of a sequence for the one or more of the STF for the second type STA and the LTF for the second type STA in every N tones with an interval of N tones among the second tones in the frequency domain, and

by setting a remainder of the second tones, to which the components of the sequence are not mapped, to zero, the N being an integer representable as power of 2; and

transmitting the frame to a second STA.

2. The method of claim 1, wherein the N is differently determined based on a length of each symbol for the LTF for the second type STA in a time domain.

3. The method of claim 1, wherein the N is determined as one of 4, 2 or 1.

4. The method of claim 1, wherein the N is differently determined based on a length of the STF for the second type STA in a time domain.

5. A station (STA) configured to transmit a preamble in a wireless local area network (WLAN), the STA comprising:

a processor for configuring a frame comprising a first part of the frame for a first type STA and a second part of the frame for a second type STA,

wherein the first type STA is a legacy STA in view of the second type STA,

wherein the first part of the frame comprises a STF (Short Training Field) for the first type STA and a LTF (Long Training Field) for the first type STA,

wherein the second part of the frame comprises a STF for the second type STA and a LTF for the second type STA,

wherein a first tone spacing between first tones in a frequency domain for the first part is M times larger than a second tone spacing between second tones in the frequency domain for the second part, the M being an inter greater than 1, and

wherein one or more of the STF for the second type STA and the LTF for the second type STA is configured;

by mapping each of components of a sequence for the one or more of the STF for the second type STA and the LTF for the second type STA in every N tones with an interval of N tones among the second tones in the frequency domain, and

by setting a remainder of the second tones, to which the components of the sequence are not mapped, to zero, the N being an integer representable as power of 2; and

a transceiver for transmitting the frame to a second STA.

6. The STA of claim 5, wherein the N is differently determined based on a length of the LTF for the second type STA in a time domain.

7. The STA of claim 5, wherein the N is determined as one of 4, 2 or 1.

8. The STA of claim 5, wherein the N is differently determined based on a length of the STF for the second type STA in a time domain.