# US 10,313,169 B2 · System and method for high efficiency wireless local area network communications

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- Number: US 10,313,169 B2
- Document ID: US10313169B2
- Status: Granted
- Kind: B2
- Application number: 15/661,474
- Filed: 2017-07-27
- Published: 2017-11-09
- Granted: 2019-06-04
- Earliest claimed: 2013-11-12
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Jung Hoon Suh; Peiying Zhu; Osama Aboul-Magd; Kwok Shum Au; Sheng Sun
- Web page: https://patentgrep.com/patent/US10313169B2

## CPC

- 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)}
- H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system}
- H04L 27/2604: {Multiresolution systems (by means of multiresolution subcarriers H04L27/183, H04L27/3488)}
- H04L 27/2628: {Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence)}
- H04L 27/0012: {arrangements for identifying the type of modulation}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

System and method embodiments are provided for high efficiency wireless communications. In an embodiment, a method in a network component for transmitting a frame of two different fast Fourier transform (FFT) sizes includes generating a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a first portion and a second portion, wherein the first portion comprises a first FFT size and the second portion comprises a second FFT size; and transmitting the frame during a single transmission opportunity.

## Claims

### Claim 1

A method in a network component for transmitting a frame of two different fast Fourier transform (FFT) sizes, comprising:
generating a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, wherein the first FFT size is 64 tones per 20 MHz symbol, wherein the second FFT size is at least 512 tones per 20 MHz symbol, wherein the second FFT size is a high efficiency wireless local area network (HEW) FFT size, wherein at least a first part of the preamble portion is modulated according to a first modulation scheme and at least a second part of the preamble portion is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is a higher order modulation than BPSK modulation, wherein the preamble portion comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal (L-SIG) field, and a frame control field, wherein the frame control field comprises a downlink/uplink (DL/UL) MAP configuration, and wherein the frame control field is modulated with the second modulation scheme; and
transmitting the frame during a single transmission opportunity.

### Claim 2 (depends on 1)

The method of claim 1, wherein the second modulation scheme is quadrature phase shift keying (QPSK).

### Claim 3 (depends on 1)

The method of claim 1, wherein the preamble portion comprises a legacy format.

### Claim 4 (depends on 1)

The method of claim 1, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

### Claim 5 (depends on 1)

The method of claim 1, wherein the preamble portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

### Claim 6 (depends on 1)

The method of claim 1, wherein the frame control field causes a non-HEW device to stop decoding the frame when encountered by an auto-detection mechanism.

### Claim 7 (depends on 1)

The method of claim 1, wherein the frame comprises common reference sequences (CRS) for channel estimation.

### Claim 8 (depends on 7)

The method of claim 7, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

### Claim 9 (depends on 1)

The method of claim 1, wherein the frame comprises a data demodulation reference sequences (DMRS).

### Claim 10 (depends on 9)

The method of claim 9, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.

### Claim 11

A wirelessly enabled network component, comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
generate a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different fast Fourier transform (FFT) sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, wherein the first FFT size is 64 tones per 20 MHz symbol, wherein the second FFT size is at least 512 tones per 20 MHz symbol, wherein the second FFT size is a high efficiency wireless local area network (HEW) FFT size, wherein at least a first part of the preamble portion is modulated according to a first modulation scheme and at least a second part of the preamble portion is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is a higher order modulation than BPSK modulation, wherein the preamble portion comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal (L-SIG) field, and a frame control field, wherein the frame control field comprises a downlink/uplink (DL/UL) MAP configuration, and wherein the frame control field is modulated with the second modulation scheme; and
transmit the frame during a single transmission opportunity.

### Claim 12 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the second modulation scheme is quadrature phase shift keying (QPSK).

### Claim 13 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the preamble portion comprises a legacy format.

### Claim 14 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

### Claim 15 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the preamble portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

### Claim 16 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the frame control field causes a non-HEW device to stop decoding the frame when encountered by an auto-detection mechanism.

### Claim 17 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the frame comprises common reference sequences (CRS) for channel estimation.

### Claim 18 (depends on 17)

The wirelessly enabled network component of claim 17, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

### Claim 19 (depends on 11)

The wirelessly enabled network component of claim 11, wherein the frame comprises a data demodulation reference sequences (DMRS).

### Claim 20 (depends on 19)

The wirelessly enabled network component of claim 19, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.

### Claim 21

A method in a wireless network device, comprising:
receiving a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different FFT sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, wherein the first FFT size is 64 tones per 20 MHz symbol, wherein the second FFT size is at least 512 tones per 20 MHz symbol, wherein the second FFT size is a high efficiency wireless local area network (HEW) FFT size, wherein at least a first part of the preamble portion is modulated according to a first modulation scheme and at least a second part of the preamble portion is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is a higher order modulation than BPSK modulation, wherein the preamble portion comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal (L-SIG) field, and a frame control field, wherein the frame control field comprises a downlink/uplink (DL/UL) MAP configuration, and wherein the frame control field is modulated with the second modulation scheme;
decoding the preamble portion according to the first FFT size; and
decoding the data portion according to the second FFT size.

### Claim 22

A wireless system, comprising:
a transmitter; and
a processor coupled to the transmitter, wherein the processor is configured to generate a frame, wherein the frame comprises orthogonal frequency-division multiplexing (OFDM) symbols in two different fast Fourier transform (FFT) sizes, wherein the frame comprises a preamble portion and a data portion, wherein the preamble portion comprises a first FFT size and the data portion comprises a second FFT size, wherein the first FFT size and the second FFT size are different, wherein the first FFT size is 64 tones per 20 MHz symbol, wherein the second FFT size is at least 512 tones per 20 MHz symbol, wherein the second FFT size is a high efficiency wireless local area network (HEW) FFT size, wherein at least a first part of the preamble portion is modulated according to a first modulation scheme and at least a second part of the preamble portion is modulated according to a second modulation scheme, wherein the first modulation scheme is binary phase-shift keying (BPSK) modulation and the second modulation scheme is a higher order modulation than BPSK modulation, wherein the preamble portion comprises a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal (L-SIG) field, and a frame control field, wherein the frame control field comprises a downlink/uplink (DL/UL) MAP configuration, wherein the frame control field is modulated with the second modulation scheme, and wherein the processor is further configured to cause the transmitter to transmit the frame during a single transmission opportunity.

### Claim 23 (depends on 22)

The system of claim 22, wherein the preamble portion comprises a legacy format.

### Claim 24 (depends on 22)

The system of claim 22, wherein the frame comprises a first field and a second field, and wherein the first field provides automatic gain control (AGC) and synchronization and the second field provides synchronization and channel estimation.

### Claim 25 (depends on 22)

The system of claim 22, wherein the preamble portion comprises a first field and a second field that provide information enabling a receiver to estimate two stream channels for two stream space-time block code (STBC).

### Claim 26 (depends on 22)

The system of claim 22, wherein the frame control field causes a non-HEW device to stop decoding the frame when encountered by an auto-detection mechanism.

### Claim 27 (depends on 22)

The system of claim 22, wherein the frame comprises common reference sequences (CRS) for channel estimation.

### Claim 28 (depends on 27)

The system of claim 27, wherein a number of symbols in which the CRS is inserted is determined according to a number of physical antennas.

### Claim 29 (depends on 22)

The system of claim 22, wherein the frame comprises a data demodulation reference sequences (DMRS).

### Claim 30 (depends on 29)

The system of claim 29, wherein a number of symbols in which the DMRS is inserted is determined according to a number of transmission streams.