Wake-Up Packet Transmission Using OOK Modulation
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Solution Overview
Problem
Current wireless LAN systems face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and outdoor settings, where existing technologies struggle to efficiently manage interference and user load.
Innovation Solution
The proposed method involves transmitting wake-up packets using the On-Off Keying (OOK) method in a wireless LAN system, where wake-up packets are configured with specific data rates and sync fields to reduce power consumption and complexity in the receiving device, allowing for efficient low-power communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wake-up packet transmission methods are used in wireless LAN systems, then the receiving device can detect wake-up signals, but the power consumption and complexity of the receiving device increase
Solution Approach 1:
The patent changes the modulation parameter from conventional methods to On-Off Keying (OOK), where the wake-up packet uses simple on/off signal states instead of complex modulation schemes. This parameter change enables the receiving device to detect wake-up signals while significantly reducing power consumption and decoding complexity
Solution Approach 2:
The patent applies different signal characteristics to different parts of the communication system: the wake-up packet uses OOK modulation with simple on/off states for low-power detection, while other communication data can use more sophisticated modulation. This local differentiation allows the receiving device to optimize power consumption specifically for wake-up detection without compromising overall communication performance
2Reliability
If conventional wake-up packet transmission methods are used, then communication can be maintained, but spectrum efficiency and area throughput decrease in dense environments
Solution Approach 1:
The patent segments the communication process into two distinct parts: wake-up signal transmission using OOK modulation for low-complexity detection, and subsequent data communication using conventional high-efficiency modulation. This segmentation allows wake-up packets to be transmitted efficiently without interfering with the high-throughput requirements of actual data communication, thereby improving overall spectrum efficiency in dense environments
Solution Approach 2:
The patent extracts the wake-up signal function from the main data communication stream and handles it separately using OOK modulation. This extraction allows the wake-up packets to be processed with minimal complexity while the main communication channel can operate at full spectrum efficiency, resolving the contradiction between reliability and productivity
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 enables reduced power consumption in the receiving device during wake-up decoding and indicates data rates using complementary sync fields, thereby enhancing spectrum efficiency and area throughput in dense and outdoor environments.
Implementation Method 1
The on signal or the off signal is generated by applying a third sequence to 13 consecutive subcarriers in a 20 MHz band and by performing 64-point Inverse Fast Fourier Transform (IFFT)
Implementation Method 2
The first and second wake-up packets are configured of an on signal or an off signal by applying an On-Off Keying (OOK) method
Data Source
AI summary
Presented are a method and device for transmitting a wakeup packet in a wireless LAN system. Specifically, the transmission device configures a first wakeup packet having a first data rate by using a first sync field, and a second wakeup packet having a second data rate by using a second sync field. The transmission device transmits the first and second wakeup packets to a receiving device. Here, an OOK scheme is applied to the first and second wakeup packets to configure the first and second wakeup packets as an ON signal or an OFF signal. The first sync field includes a first sequence, and the second sync field includes a second sequence which is a complementary sequence to the first sequence. The number of coefficient 1 and coefficient 0 included in the first sequence is the same. The first and second sequences have a 32 bit length, and each bit of the first and second sequences has a duration of 2 μs.