IP Library › Granted Patent US 10,187,893
Granted Patent B2
US 10,187,893 · App. 15/490,798 · Granted Jan 22, 2019

Method and apparatus for configuring long training field in wireless local network system

Inventors: Eunsung Park (Seoul, KR); Dongguk Lim (Seoul, KR); Hangyu Cho (Seoul, KR); Jinsoo Choi (Seoul, KR)
Assignee: LG ELECTRONICS INC.
H04W72/0453H04W24/02H04W84/12
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 10,187,893
App. No.
15/490,798
Granted
Jan 22, 2019
Kind
B2
Abstract

Provides are a method and apparatus for configuring an LTF sequence in a wireless LAN system. More specifically, a transmission apparatus generates an LTF sequence corresponding to a first frequency band. The transmission apparatus sends an LTF sequence corresponding to the first frequency band to a reception apparatus. In this case, an LTF sequence corresponding to the second 106-RU of a second frequency band is used as a sequence located in the second 106-RU of the second frequency band in the LTF sequence corresponding to the first frequency band. The transmission apparatus may apply a phase shift of 180° to the LTF sequence corresponding to the second 106-RU of the second frequency band.

Claims (3299)

1. A method in a wireless LAN system supporting a plurality of frequency resource units (RUs) corresponding to different frequency bands, the method comprising:

generating, by a transmission apparatus, a long training field (LTF) sequence corresponding to a first frequency band; and

sending, by the transmission apparatus, an LTF sequence corresponding to the first frequency band to a reception apparatus,

wherein an LTF sequence corresponding to a second 106-RU of a second frequency band is used as a sequence located in the second 106-RU of the second frequency band in the LTF sequence corresponding to the first frequency band, and

if a bandwidth of the first frequency band is 40 MHz and a bandwidth of the second frequency band is 20 MHz, the LTF sequence corresponding to the first frequency band is defined as follow,

{

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

0

,

0

,

0

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

}

,

and

the 106-RU comprises a frequency RU having 106 subcarriers.

2. The method of claim 1 , wherein the LTF sequence corresponding to the first frequency band is disposed at intervals of 2 tones from a lowest tone having a tone index of −244 to a highest tone having a tone index of +244.

3. The method of claim 1 , wherein the LTF sequence corresponding to the second 106-RU of the second frequency band is defined as follows.

{

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

}

.

4. The method of claim 3 , wherein if a phase shift of 180° is applied to the LTF sequence corresponding to the second 106-RU of the second frequency band, the LTF sequence corresponding to the first frequency band is defined as follows.

{

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

0

,

0

,

0

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

*

⁡

[

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

]

,

+

1

}

.

5. The method of claim 1 , wherein the reception apparatus has only a capability of the second frequency band.

6. The method of claim 1 , wherein the second frequency band is located in a second subband of the first frequency band.

7. The method of claim 1 , wherein in the LTF sequence corresponding to the first frequency band, a tone is not additionally nulled.

8. A transmission apparatus in a wireless LAN system, comprising:

an RF unit configured to send or receive a radio signal; and

a processor configured to control the RF unit,

wherein the processor is configured to:

generate a long training field (LTF) sequence corresponding to a first frequency band; and

send an LTF sequence corresponding to the first frequency band to a reception apparatus,

wherein an LTF sequence corresponding to a second 106-RU of a second frequency band is used as a sequence located in the second 106-RU of the second frequency band in the LTF sequence corresponding to the first frequency band, and

if a bandwidth of the first frequency band is 40 MHz and a bandwidth of the second frequency band is 20 MHz, the LTF sequence corresponding to the first frequency band is defined as follow,

{

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

0

,

0

,

0

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

}

,

and

the 106-RU comprises a frequency RU having 106 subcarriers.

9. The transmission apparatus of claim 8 , wherein the LTF sequence corresponding to the second 106-RU of the second frequency band is defined as follows.

{

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

}

.

10. The transmission apparatus of claim 9 , wherein if a phase shift of 180° is applied to the LTF sequence corresponding to the second 106-RU of the second frequency band, the LTF sequence corresponding to the first frequency band is defined as follows.

{

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

0

,

0

,

0

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

-

1

*

⁡

[

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

+

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

,

+

1

,

+

1

,

-

1

,

-

1

,

+

1

,

-

1

,

-

1

,

-

1

,

-

1

,

-

1

,

+

1

,

-

1

,

+

1

]

,

+

1

}

.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 28, 2017
From: PARK, EUNSUNG; LIM, DONGGUK; CHO, HANGYU; CHOI, JINSOO
To: LG ELECTRONICS INC.
Reel/Frame 042187/0255 →
Continuity (6)
Provisional Application 62352010 · Jun 19, 2016
Provisional Application 62347064 · Jun 7, 2016
Provisional Application 62344339 · Jun 1, 2016
Provisional Application 62330822 · May 2, 2016
Provisional Application 62324348 · Apr 19, 2016
Related Publication 20170303279A1 · Oct 19, 2017