Wireless LAN Wake-Up Packet Transmission via OOK Modulation
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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 multiple access points and stations, and require efficient low-power communication methods to reduce interference and enhance performance.
Innovation Solution
The proposed method involves transmitting a wake-up packet using an HE PPDU with an OOK modulation scheme, allowing for simultaneous data frame transmission and wake-up frame transmission through different frequency bands, optimizing resource allocation and reducing power consumption in low-power wake-up receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wake-up frames are transmitted using traditional methods, then low-power receiving is achieved, but resource efficiency is reduced due to dedicated wake-up receiver resources
Solution Approach 1:
The patent makes the main receiver perform both wake-up frame reception and data frame reception functions by configuring it to detect OOK-modulated wake-up frames in addition to its primary function of receiving OFDM-modulated data frames. This eliminates the need for a separate dedicated wake-up receiver, improving resource efficiency while maintaining low-power operation.
Solution Approach 2:
The patent combines the wake-up frame reception function with the main receiver by allowing the main receiver to handle both wake-up frames (OOK-modulated) and data frames (OFDM-modulated). This merging of functions into a single receiver improves resource utilization while preserving the energy-saving benefits of wake-up frame technology.
2Use of energy by moving object
If separate wake-up receiver is used, then low-power communication is achieved, but device complexity increases due to multiple receivers
Solution Approach 1:
The main receiver is configured to perform multiple functions: detecting OOK-modulated wake-up frames and receiving OFDM-modulated data frames. This multi-functionality eliminates the need for a separate wake-up receiver, reducing device complexity while maintaining low-power communication capabilities.
3Productivity
If main receiver handles both wake-up and data frames, then resource efficiency improves, but detection accuracy may worsen due to different modulation schemes
Solution Approach 1:
The patent segments the reception process into two distinct phases: first, the main receiver detects OOK-modulated wake-up frames using envelope detection; second, upon wake-up signal detection, the receiver switches to OFDM demodulation for data frame reception. This segmentation allows each modulation scheme to be processed with its optimal detection method, maintaining detection accuracy while improving resource efficiency.
Solution Approach 2:
The main receiver operates in periodic cycles, alternating between wake-up frame detection mode (OOK demodulation) and data frame reception mode (OFDM demodulation). This periodic switching between different reception modes allows the receiver to handle both types of frames with appropriate detection methods, maintaining accuracy for each while improving overall resource utilization.
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 maximizes resource efficiency by utilizing unallocated resource units and enables low-power wake-up decoding, reducing power consumption and enhancing system performance in dense wireless LAN environments.
Implementation Method 1
An on-off keying (OOK) method is applied the wake-up frame, which is configured with an on signal and an off signal.
Data Source
AI summary
A method and a device for transmitting a wake-up frame in a wireless LAN system are proposed. In particular, the transmission device configures a PPDU to which a first wireless LAN system is applied. The transmission device transmits, via the PPDU, a wake-up frame to which a second wireless LAN system is applied. The PPDU is transmitted via a first frequency band. The PPDU comprises a signal field and a data field. The signal field indicates that a data frame is transmitted in at least one RU excluding three 26-RUs located at the center of a second frequency band included in the first frequency band. The wake-up frame is transmitted via a 4 MHz band located at the center of the three 26-RUs. A coefficient is inserted in a first subcarrier constituting the 4 MHz band. The wake-up frame has an OOK scheme applied thereto and thus comprises an on signal and an off signal.