# US 12,192,893 B2 · Methods and arrangements for low power wireless networks

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- Number: US 12,192,893 B2
- Document ID: US12192893B2
- Status: Granted
- Kind: B2
- Application number: 18/117,001
- Filed: 2023-03-03
- Published: 2023-10-05
- Granted: 2025-01-07
- Earliest claimed: 2011-04-26
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Thomas J. Kenney; Eldad Perahia
- Web page: https://patentgrep.com/patent/US12192893B2

## CPC

- H04W 52/02: Power saving arrangements
- H04L 27/2613: {Structure of the reference signals}
- H04L 69/22: Parsing or analysis of headers
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Embodiments may comprise an orthogonal frequency division multiplexing (OFDM) system operating in the 1 GHz and lower frequency bands. In many embodiments, physical layer logic may implement a new preamble structure with a new signal field. Embodiments may store the preamble structure and/or a preamble based upon the new preamble structure on a machine-accessible medium. Some embodiments may generate and transmit a communication with the new preamble structure. Further embodiments may receive and detect communications with the new preamble structure.

## Claims

### Claim 1

An apparatus, comprising:
memory; and
a processor coupled with the memory to:
generate a preamble in a physical protocol data unit (PPDU) to transmit by a transmitter via a wireless channel of a below 1 GHz frequency band, the preamble of the PPDU to comprise a short training field (STF), a long training field (LTF), and a signal field, the processor to generate the preamble as a 1 MHz bandwidth (BW) preamble and to replicate the STF, the LTF, and the signal field of the 1 MHz BW preamble to generate a 2 MHz BW preamble for transmission of the PPDU as a 2 MHz BW PPDU, a 4 MHz BW preamble for transmission of the PPDU as a 4 MHz BW PPDU, an 8 MHz BW preamble for transmission of the PPDU as a 8 MHz BW PPDU, or a 16 MHz BW preamble for transmission of the PPDU as a 16 MHz BW PPDU; and
cause transmission of the PPDU.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising the transmitter coupled with the processor and an antenna coupled with the transmitter to transmit the PPDU.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein a duration of the signal field is 80 microseconds.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein a duration of the STF is 80 microseconds.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein a duration of the LTF is 80 microseconds and a duration of an additional LTF is 40 microseconds.

### Claim 6 (depends on 1)

The apparatus of claim 1, the preamble to comprise one or more additional LTFs following the signal field.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein a duration of a guard interval 16 microseconds.

### Claim 8 (depends on 1)

The apparatus of claim 1, wherein the signal field comprises a space-time block coding (STBC) field to comprise a STBC parameter to designate whether space-time block coding is implemented.

### Claim 9 (depends on 1)

The apparatus of claim 1, the signal field to comprise a short guard interval parameter to comprise one bit.

### Claim 10 (depends on 1)

The apparatus of claim 1, the signal field to comprise a coding parameter to designate whether binary convolutional coding (BCC) or low density parity check (LDPC) is used.

### Claim 11 (depends on 1)

The apparatus of claim 1, the signal field to comprise a modulation and coding scheme (MCS) parameter to designate a modulation format and a coding rate.

### Claim 12

A non-transitory machine-accessible product comprising code, the code to cause a processor to perform operations when executed by the processor, the operations to:
generate a preamble in a physical protocol data unit (PPDU) to transmit by a transmitter via a wireless channel of a below 1 GHz frequency band, the preamble of the PPDU to comprise a short training field (STF), a long training field (LTF), and a signal field, the processor to generate the preamble as a 1 MHz bandwidth (BW) preamble and to replicate the STF, the LTF, and the signal field of the 1 MHz BW preamble to generate a 2 MHz BW preamble for transmission of the PPDU as a 2 MHz BW PPDU, a 4 MHz BW preamble for transmission of the PPDU as a 4 MHz BW PPDU, an 8 MHz BW preamble for transmission of the PPDU as a 8 MHz BW PPDU, or a 16 MHz BW preamble for transmission of the PPDU as a 16 MHz BW PPDU.

### Claim 13 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise a short guard interval parameter to comprise one bit.

### Claim 14 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise a modulation and coding scheme (MCS) parameter to designate a modulation format and a coding rate, the MCS parameter to designate the modulation format comprising one of:
binary phase-shift keying (BPSK);
quadrature phase-shift keying (QPSK);
16-point constellation quadrature amplitude modulation (16-QAM);
64-point constellation quadrature amplitude modulation (64-QAM); and
256-point constellation quadrature amplitude modulation (256-QAM).

### Claim 15 (depends on 14)

The non-transitory machine-accessible product of claim 14, the MCS parameter designating a BPSK modulation format and a coding rate of ½.

### Claim 16 (depends on 14)

The non-transitory machine-accessible product of claim 14, the MCS parameter designating a 256-QAM modulation format and a coding rate of ¾.

### Claim 17 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise an aggregation parameter to designate whether or not to use medium access control protocol data unit (MPDU) aggregation.

### Claim 18 (depends on 17)

The non-transitory machine-accessible product of claim 17, the aggregation parameter to comprise one bit.

### Claim 19 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise a length parameter to describe a length of a transmit vector in octets.

### Claim 20 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise a cyclic redundancy check (CRC) parameter to designate a CRC for the signal field.

### Claim 21 (depends on 12)

The non-transitory machine-accessible product of claim 12, the signal field to comprise a tail parameter to designate an end of the signal field.

### Claim 22 (depends on 21)

The non-transitory machine-accessible product of claim 21, the tail parameter to comprise six bits.