Wake-Up Packet Transmission Using OOK and Manchester Coding

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Solution Overview

Problem

Next-generation wireless LAN systems face challenges in improving spectrum efficiency and area throughput, especially in dense environments with high user loads and interference, and require efficient power management for low-power communication.

Innovation Solution

The method involves transmitting a wake-up packet using an OOK scheme and Manchester coding, which reduces power consumption by employing an envelope detector for decoding and minimizing consecutive OFF-symbols, ensuring coexistence with legacy Wi-Fi devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional wake-up packet transmission is used, then receiving devices can wake up, but power consumption during decoding is high

Engineering Contradiction:

Improvepower consumption during wake-up decodingVSAvoidwake-up decoding reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent extracts and applies Manchester coding specifically to wake-up packet transmissions, separating this function from general data transmission protocols. This dedicated approach allows optimization for low-power envelope detector decoding while maintaining reliability, as the coding scheme is specifically designed for this purpose rather than being a general-purpose protocol

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the modulation parameter by using Manchester coding which ensures signal transitions at mid-point, making the signal inherently detectable by simple envelope detectors. This parameter change from conventional modulation schemes enables low-power decoding while maintaining decoding reliability through the guaranteed signal transitions

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If OOK scheme with Manchester coding is used, then power consumption is reduced, but signal complexity increases

Engineering Contradiction:

Improvepower consumptionVSAvoidsignal encoding complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent employs simple envelope detectors at the receiving end that are computationally inexpensive and low-power, trading off some decoding robustness for dramatically reduced power consumption. The Manchester coding provides sufficient reliability for wake-up signals while keeping the receiver complexity minimal

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

Manchester coding introduces periodic signal transitions at mid-point of each symbol, creating a regular pattern that is easily detectable by simple envelope detectors. This periodic structure reduces the need for complex synchronization and decoding logic while maintaining reliable detection

Inventive Principle:

Principle #19Periodic action

3Speed

If wake-up packets are transmitted frequently, then devices can respond quickly, but spectrum efficiency decreases

Engineering Contradiction:

Improvewake-up response speedVSAvoidspectrum efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent extracts wake-up packet transmission as a separate, dedicated function using OOK modulation with Manchester coding, distinct from general data transmission. This separation allows wake-up signals to be transmitted efficiently without consuming spectrum resources allocated for high-rate data transmission, thereby maintaining spectrum efficiency while enabling fast wake-up response

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses partial spectrum utilization by employing OOK modulation that occupies only the necessary bandwidth for wake-up signals, rather than using full spectrum resources. This partial action approach provides sufficient wake-up capability with minimal spectrum consumption, leaving resources available for data transmission

Inventive Principle:

Principle #16Partial or excessive action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for reduced power consumption in receiving devices during wake-up decoding and prevents consecutive OFF-symbols, enhancing system performance and compatibility with legacy devices.

Implementation Method 1

The transmitting device transmits the wake-up packet to the receiving device

Methodology Applied

Scientific EffectElectromagnetic wave propagation: Electromagnetic Induction

Data Source

PatentUS10924998B2Method and apparatus for transmitting wake-up packet in wireless LAN system

Publication Date: 2021.02.16 LG ELECTRONICS INC

AI summary

Disclosed are a method and apparatus for transmitting a wake-up packet in a wireless LAN system. Specifically, a transmission apparatus composes a wake-up packet and transmits same to a receiving apparatus. An OOK scheme and Manchester coding are applied to the wake-up packet. The wake-up packet comprises a sequence containing first information and second information. The first information and second information comprise on and off signals. The on signal applies a first sequence on K number of successive subcarriers in a 20 MHz band, and is transmitted by means of a first symbol generated by carrying out a 64-point IFFT. In the first sequence, one from among a subcarrier having a subcarrier index that is an even number and subcarrier having a subcarrier index that is an odd number is nulled.