# US 2021/0242998 A1 · Method and device for transmitting ppdu in wireless lan system

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- Number: US 2021/0242998 A1
- Document ID: US20210242998A1
- Status: Published application
- Kind: A1
- Application number: 16/972,275
- Filed: 2019-06-10
- Published: 2021-08-05
- Earliest claimed: 2018-06-15
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Eunsung PARK; Sunwoong YUN; Dongguk LIM; Jinsoo CHOI
- Web page: https://patentgrep.com/patent/US20210242998A1

## CPC

- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 27/2613: {Structure of the reference signals}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 80/02: Data link layer protocols
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and a device for transmitting a PPDU in a WLAN system are proposed. Specifically, an AP generates a PPDU and transmits the PPDU to a STA through a broadband. The PPDU includes an EHT-LTF and a data field. The data field includes a pilot tone. The coefficient of the pilot tone is set to a second pilot sequence in which a first pilot sequence is repeated. The first pilot sequence is {1 1 1 −1 −1 1 1 1}.

## Claims

### Claim 1

A method for transmitting a physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the method comprising:
generating, by an access point (AP), a PPDU; and
transmitting, by the AP, the PPDU to a station (STA) through a broadband,
wherein the PPDU comprises an extremely high throughput (EHT)-LTF and a data field,
the data field comprises a pilot tone,
a coefficient of the pilot tone is set to a second pilot sequence in which a first pilot sequence is repeated, and
the first pilot sequence is {1 1 1 −1 −1 1 1 1}.

### Claim 2 (depends on 1)

The method of claim 1, wherein the pilot tone is configured based on resource unit (RU) information about the broadband,
the first pilot sequence is determined to be a coefficient of a pilot tone used in a 242-tone RU, and
the 242-tone RU is allocated based on the RU information.

### Claim 3 (depends on 1)

The method of claim 1, wherein the broadband is a 240 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence six times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 4 (depends on 1)

The method of claim 1, wherein the broadband is a 240 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence three times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 5 (depends on 1)

The method of claim 1, wherein the broadband is a 320 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence eight times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 6 (depends on 1)

The method of claim 1, wherein the broadband is a 320 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence four times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 7 (depends on 2)

The method of claim 2, wherein the PPDU further comprises a legacy preamble, an EHT-signal (SIG)-A, an EHT-SIG-B, and an EHT-short training field (STF), and
the RU information is comprised in the EHT-SIG-B.

### Claim 8

An access point (AP) for transmitting a physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the AP comprising:
a memory;
a transceiver; and
a processor operatively connected with the memory and the transceiver,
wherein the processor generates a PPDU and transmits the PPDU to a station (STA) through a broadband,
the PPDU comprises an extremely high throughput (EHT)-LTF and a data field,
the data field comprises a pilot tone,
a coefficient of the pilot tone is set to a second pilot sequence in which a first pilot sequence is repeated, and
the first pilot sequence is {1 1 1 −1 −1 1 1 1}.

### Claim 9 (depends on 8)

The AP of claim 8, wherein the pilot tone is configured based on resource unit (RU) information about the broadband,
the first pilot sequence is determined to be a coefficient of a pilot tone used in a 242-tone RU, and
the 242-tone RU is allocated based on the RU information.

### Claim 10 (depends on 8)

The AP of claim 8, wherein the broadband is a 240 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence six times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 11 (depends on 8)

The AP of claim 8, the broadband is a 240 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence three times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 12 (depends on 8)

The AP of claim 8, wherein the broadband is a 320 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence eight times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 13 (depends on 8)

The AP of claim 8, wherein the broadband is a 320 MHz band,
the second pilot sequence is generated by repeating the first pilot sequence four times, and
the second pilot sequence is {1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1 1 1 1 −1 −1 1 1 1}.

### Claim 14 (depends on 9)

The AP of claim 9, wherein the PPDU further comprises a legacy preamble, an EHT-signal (SIG)-A, an EHT-SIG-B, and an EHT-short training field (STF), and
the RU information is comprised in the EHT-SIG-B.

### Claim 15

A method for receiving a physical protocol data unit (PPDU) in a wireless local area network (WLAN) system, the method comprising:
receiving, by a station (STA), a PPDU from an access point (AP) through a broadband; and
decoding, by the STA, the PPDU,
wherein the PPDU comprises an extremely high throughput (EHT)-LTF and a data field,
the data field comprises a pilot tone,
a coefficient of the pilot tone is set to a second pilot sequence in which a first pilot sequence is repeated, and
the first pilot sequence is {1 1 1 −1 −1 1 1 1}.