IP Library › Granted Patent US 11,496,244

Granted Patent B2

US 11,496,244 · App. 17/264,259 · Granted Nov 8, 2022

Method and apparatus for transmitting PPDU in broadband having preamble puncturing performed in wireless LAN system

Inventors: Eunsung Park (Seoul, KR); Jinmin Kim (Seoul, KR); Dongguk Lim (Seoul, KR); Jinsoo Choi (Seoul, KR)

Assignee: LG ELECTRONICS INC.

H04L1/0068 H04L1/0061 H04L27/2614 H04L27/3872 H04W84/12

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Quick Facts

Patent No.: US 11,496,244
App. No.: 17/264,259
Granted: Nov 8, 2022
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

A method and apparatus for transmitting PPDU in a wireless LAN system are proposed. Specifically, a transmitter generates the PPDU, and transmits the PPDU to a receiver through a 320 MHz band in which some bands are punctured. The PPDU includes a legacy preamble and an EHT field. The legacy preamble includes L-STF and L-LTF. The legacy preamble is generated by applying a first phase rotation value or a second phase rotation value. The first phase rotation value is obtained on the basis of a third phase rotation value and a fourth phase rotation value. The third phase rotation value is a phase rotation value having repeated a phase rotation value defined for an 80 MHz band in an 802.11ax system. The fourth phase rotation value is a phase rotation value defined in units of the 80 MHz band in the 320 MHZ band on the basis of an optimal PAPR of the L-LTF.

Claims (126)

1. A method of transmitting a physical protocol data unit (PPDU) in a WLAN system, comprising:

generating, by a transmission apparatus, the PPDU; and

transmitting, by the transmission apparatus, the PPDU to a reception apparatus through a 320 MHz band having some band punctured,

wherein the PPDU comprises a legacy preamble and an extreme high throughput (EHT) field,

the legacy preamble comprises a legacy-short training field (L-STF) and a legacy-long training field (L-LTF),

the legacy preamble is generated by applying a first phase rotation value or a second phase rotation value,

the first phase rotation value is obtained based on a third phase rotation value and a fourth phase rotation value,

the third phase rotation value is a phase rotation value obtained by repeating a phase rotation value defined for an 80 MHz band in an 802.11ax system,

the fourth phase rotation value is a phase rotation value defined in units of an 80 MHz band in the 320 MHz band based on an optimal PAPR of the L-LTF,

the 320 MHz band are composed of subcarriers having subcarrier indices from −512 to 511,

the third phase rotation value is [1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1 1 −1 −1 −1],

a first 1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −512 to −449,

a second −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −448 to −385,

a third −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −384 to −321,

a fourth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −320 to −257,

a fifth 1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −256 to −193,

a sixth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −192 to −129,

a seventh −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −128 to −65,

an eighth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from −64 to −1,

a ninth 1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 0 to 63,

a tenth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 64 to 127,

an eleventh −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 128 to 191,

a twelfth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 192 to 255,

a thirteenth 1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 256 to 319,

a fourteenth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 320 to 383,

a fifteenth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 384 to 447, and

a sixteenth −1 of the third phase rotation value is applied to subcarriers having subcarrier indices from 448 to 511.

2. The method of claim 1 , wherein:

the fourth phase rotation value is [1 j 1 j],

a first 1 of the fourth phase rotation value is applied to a first 80 MHz band of the 320 MHz,

a second j of the fourth phase rotation value is applied to a second 80 MHz band of the 320 MHz band,

a third 1 of the fourth phase rotation value is applied to a third 80 MHz band of the 320 MHz band, and

a fourth j of the fourth phase rotation value is applied to a fourth 80 MHz band of the 320 MHz band.

3. The method of claim 2 , wherein:

the first phase rotation value is obtained based on a product of the third phase rotation value and the fourth phase rotation value, and

the first phase rotation value is [1 −1 −1 −1 j −j −j −j 1 −1 −1 −1 j −j −j −j].

4. The method of claim 1 , wherein:

the fourth phase rotation value is [1 −j 1 −j],

a first 1 of the fourth phase rotation value is applied to a first 80 MHz band of the 320 MHz band,

a second −j of the fourth phase rotation value is applied to a second 80 MHz band of the 320 MHz band,

a third 1 of the fourth phase rotation value is applied to a third 80 MHz band of the 320 MHz band, and

a fourth −j of the fourth phase rotation value is applied to a fourth 80 MHz band of the 320 MHz band.

5. The method of claim 4 , wherein:

the first phase rotation value is obtained based on a product of the third phase rotation value and the fourth phase rotation value, and

the first phase rotation value is [1 −1 −1 −1 −j j j j 1 −1 −1 −1 −j j j j].

6. The method of claim 1 , wherein:

the second phase rotation value is obtained based on the third phase rotation value and the fifth phase rotation value, and

the fifth phase rotation value is a phase rotation value defined in units of an 80 MHz band in the 320 MHz band based on an optimal PAPR of the L-STF.

7. The method of claim 6 , wherein:

the fifth phase rotation value is [1 j 1 j],

a first 1 of the fifth phase rotation value is applied to a first 80 MHz band of the 320 MHz band,

a second j of the fifth phase rotation value is applied to a second 80 MHz band of the 320 MHz band,

a third 1 of the fifth phase rotation value is applied to a third 80 MHz band of the 320 MHz band, and

a fourth j of the fifth phase rotation value is applied to a fourth 80 MHz band of the 320 MHz band.

8. The method of claim 7 , wherein:

the second phase rotation value is obtained based on a product of the third phase rotation value and the fifth phase rotation value, and

the second phase rotation value is [1 −1 −1 −1 j −j −j −j 1 −1 −1 −1 j −j −j −j].

9. The method of claim 6 , wherein:

the some band comprises all 20 MHz bands except a primary 20 MHz band,

the first phase rotation value is obtained based on a preamble puncturing pattern, and

the preamble puncturing pattern is a band pattern obtained by puncturing at least one 20 MHz band of all the 20 MHz bands except the primary 20 MHz band in the 320 MHz band.

10. A transmission apparatus transmitting a physical protocol data unit (PPDU) in a WLAN system, the transmission apparatus comprising:

a memory;

a transceiver; and

a processor operatively coupled to the memory and the transceiver, wherein the processor generates the PPDU, and

transmits the PPDU to a reception apparatus through a 320 MHz band having some bands punctured,