# US 12,015,980 B2 · Methods and arrangements to support wake-up radio packet transmission

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- Number: US 12,015,980 B2
- Document ID: US12015980B2
- Status: Granted
- Kind: B2
- Application number: 18/085,156
- Filed: 2022-12-20
- Published: 2023-04-20
- Granted: 2024-06-18
- Earliest claimed: 2018-01-12
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Vinod Kristem; Shahrnaz Azizi; Thomas J. Kenney
- Web page: https://patentgrep.com/patent/US12015980B2

## CPC

- H04W 52/0232: {according to average transmission signal activity}
- H04L 5/0092: {Indication of how the channel is divided}
- H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]}
- H04L 27/2613: {Structure of the reference signals}
- H04B 7/0413: MIMO systems
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 80/02: Data link layer protocols
- 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)
- H04B: TRANSMISSION
- 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

Logic may define one or more wake-up preambles suitable for high data rates for a wake-up radio (WUR) packet. Logic may define wake-up preamble with different counts of symbols. Logic may generate a wake-up preamble as two microsecond pulses of orthogonal frequency-division multiplexing (OFDM) symbols in a four megahertz (MHz) bandwidth. Logic may generate and receive a high data rate (HDR) WUR preamble or a low data rate (LDR) WUR preamble. The HDR preamble may signal a data rate of 250 kilobits per second and the LDR preamble may signal a data rate of 62.5 kilobits per second. The HDR preamble bit count may be twice a bit count of the LDR preamble. The HDR preamble may be 32 bits. The duration of transmission of the HDR may be 64 microseconds and duration of transmission of the LDR may be 128 microseconds.

## Claims

### Claim 1

An apparatus to communicate a wake-up radio (WUR) medium access control (MAC) frame, the apparatus comprising:
a memory; and
logic circuitry coupled with the memory to:
generate a WUR physical layer protocol data unit (PPDU) comprising a legacy preamble followed by more than one binary phase-shift keying (BPSK) modulated orthogonal frequency-division multiplexing (OFDM) symbols, a WUR preamble, and WUR data, wherein the more than one BPSK symbols of the WUR PPDU are followed by the WUR preamble and the WUR data, wherein the WUR preamble comprises a high data rate (HDR) preamble, wherein the WUR data comprises the WUR MAC frame, the HDR preamble to indicate a rate of transmission of the WUR MAC frame, the HDR preamble comprising 32 bits for transmission via 2 microsecond pulses of OFDM symbols to signal a data rate of 250 kilobits per second, the WUR MAC frame comprising a MAC header and a payload, the payload comprising an action identifier and an action payload, the action identifier to identify a structure of the action payload; and
cause transmission of the WUR PPDU with the WUR MAC frame.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the logic circuitry comprises a baseband processor coupled with the memory, and further comprising a radio coupled with the logic circuitry and one or more antennas coupled with the radio to transmit the WUR PPDU with the WUR MAC frame.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the WUR preamble and the WUR data are centered in a 20 MHz subchannel of a frequency division multiple access (FDMA) WUR PPDU.

### Claim 4 (depends on 1)

The apparatus of claim 1, the logic circuitry to cause transmission of the WUR MAC frame via 2 microsecond pulses per OFDM symbol at the data rate of 250 kilobits per second, wherein a duration of the HDR preamble is 64 microseconds.

### Claim 5 (depends on 1)

The apparatus of claim 1, the logic circuitry to generate a second WUR preamble and a second WUR MAC frame, wherein the second WUR preamble comprises a low data rate (LDR) preamble.

### Claim 6 (depends on 5)

The apparatus of claim 5, the LDR preamble to signal a rate of transmission of the second WUR MAC frame of 62.5 kilobits per second.

### Claim 7 (depends on 5)

The apparatus of claim 5, the LDR preamble comprising a bit count that is twice a bit count of the HDR preamble.

### Claim 8 (depends on 5)

The apparatus of claim 5, wherein a duration of the LDR preamble is 128 microseconds.

### Claim 9 (depends on 5)

The apparatus of claim 5, the logic circuitry, after causing transmission of the LDR preamble, to cause transmission of the second WUR MAC frame via 4 microsecond pulses of OFDM symbols.

### Claim 10

A non-transitory computer-readable medium, comprising instructions to communicate a wake-up radio (WUR) medium access control (MAC) frame, which when executed by a processor, cause the processor to perform operations to:
generate a WUR physical layer protocol data unit (PPDU) comprising a legacy preamble followed by more than one binary phase-shift keying (BPSK) modulated orthogonal frequency-division multiplexing (OFDM) symbols, a WUR preamble, and WUR data, wherein the more than one BPSK symbols of the WUR PPDU are followed by the WUR preamble and the WUR data, wherein the WUR preamble comprises a high data rate (HDR) preamble and the WUR data comprises the WUR MAC frame, the HDR preamble to indicate a rate of transmission of the WUR MAC frame, the HDR preamble comprising 32 bits for transmission via 2 microsecond pulses of OFDM symbols to signal a data rate of 250 kilobits per second, the WUR MAC frame comprising a MAC header and a payload, the payload comprising an action identifier and an action payload, the action identifier to identify a structure of the action payload; and
cause transmission of the WUR PPDU with the WUR MAC frame.

### Claim 11 (depends on 10)

The non-transitory computer-readable medium of claim 10, the operations to generate the HDR preamble for transmission with a duration of 64 microseconds.

### Claim 12 (depends on 10)

The non-transitory computer-readable medium of claim 10, the operations to cause transmission of the WUR MAC frame via 2 microsecond pulses per OFDM symbol at the data rate of 250 kilobits per second.

### Claim 13 (depends on 10)

The non-transitory computer-readable medium of claim 10, the operations to generate a second WUR preamble and a second WUR MAC frame, wherein the second WUR preamble comprises a low data rate (LDR) preamble.

### Claim 14 (depends on 13)

The non-transitory computer-readable medium of claim 13, the LDR preamble comprising a bit count that is twice a bit count of the HDR preamble.

### Claim 15

An apparatus to communicate a wake-up radio (WUR) medium access control (MAC) frame, the apparatus comprising:
memory; and
a logic circuitry coupled with the memory to:
receive the WUR MAC frame of a WUR physical layer protocol data unit (PPDU), the WUR PPDU comprising a legacy preamble followed by more than one binary phase-shift keying (BPSK) modulated orthogonal frequency-division multiplexing (OFDM) symbols, a WUR preamble, and the WUR MAC frame; and
decode the WUR preamble and the WUR MAC frame, wherein the WUR preamble comprises a high data rate (HDR) preamble, the HDR preamble to indicate a rate of transmission of the WUR MAC frame, the HDR preamble comprising 32 bits to transmit using 2 microsecond pulses of OFDM symbols to signal a data rate of 250 kilobits per second, the WUR MAC frame comprising a MAC header and a payload, the payload comprising an action identifier and an action payload, the action identifier to identify a structure of the action payload.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein the logic circuitry comprises a baseband processor coupled with the memory, and further comprising a radio coupled with the logic circuitry and one or more antennas coupled with the radio to receive the WUR MAC frame.

### Claim 17 (depends on 15)

The apparatus of claim 15, the HDR preamble having a duration of 64 microseconds and the WUR MAC frame having 2 microsecond pulses per OFDM symbol at the data rate of 250 kilobits per second.

### Claim 18 (depends on 15)

The apparatus of claim 15, a low data rate (LDR) preamble comprising a bit count that is twice a bit count of the HDR preamble.

### Claim 19

A non-transitory computer-readable medium, comprising instructions to communicate a wake-up radio (WUR) medium access control (MAC) frame, which when executed by a processor, cause the processor to perform operations to:
receive the WUR MAC frame of a WUR physical layer protocol data unit (PPDU), the WUR PPDU comprising a legacy preamble followed by more than one binary phase-shift keying (BPSK) modulated orthogonal frequency-division multiplexing (OFDM) symbols, a WUR preamble, and WUR data; and
decode the WUR preamble and the WUR data, wherein the WUR preamble comprises a high data rate (HDR) preamble and the WUR data comprises the WUR MAC frame, the HDR preamble to indicate a rate of transmission of the WUR MAC frame, the HDR preamble comprising 32 bits with 2 microsecond pulses of OFDM symbols to signal a data rate of 250 kilobits per second, the WUR MAC frame comprising a MAC header and a payload, the payload comprising an action identifier and an action payload, the action identifier to identify a structure of the action payload.

### Claim 20 (depends on 19)

The non-transitory computer-readable medium of claim 19, the HDR preamble having a duration of 64 microseconds and the WUR MAC frame having 2 microsecond pulses per OFDM symbol at the data rate of 250 kilobits per second.

### Claim 21 (depends on 19)

The non-transitory computer-readable medium of claim 19, a low data rate (LDR) preamble comprising a bit count that is twice a bit count of the HDR preamble.