WLAN Wake-Up Packet Transmission Using OOK and Symbol Reduction
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) 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 power consumption and latency.
Innovation Solution
The method involves transmitting a wake-up packet using an On-Off Keying (OOK) scheme and a symbol reduction method, where the wake-up packet is configured with ON-signal and OFF-signal sequences, reducing symbol length while maintaining high data rates, and using a cyclic prefix to minimize Inter Symbol Interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional wake-up communication methods are used, then receiving devices can wake up reliably, but power consumption during wake-up decoding is high
Solution Approach 1:
The patent extracts and removes the cyclic prefix from the wake-up packet structure. By eliminating this redundant portion that does not carry useful information, the receiving device processes fewer symbols during wake-up decoding, directly reducing power consumption while maintaining reliable detection of the essential wake-up signal
Solution Approach 2:
The patent segments the wake-up packet into essential information-carrying symbols only, separating them from non-essential cyclic prefix symbols. This segmentation allows the receiver to focus processing resources on the critical wake-up indication symbols, reducing overall processing power while ensuring reliable wake-up detection
2Productivity
If symbol length is reduced to increase data rate, then high data rates are achieved, but Inter Symbol Interference increases
Solution Approach 1:
The patent removes the cyclic prefix that was traditionally used to mitigate Inter Symbol Interference. By extracting and eliminating this component, the system achieves higher data rates through shorter symbol processing, while the harm of Inter Symbol Interference is managed through alternative means such as optimized signal processing algorithms in the receiver
Solution Approach 2:
The patent employs periodic wake-up signals with optimized timing characteristics. By using periodic ON-OFF Keying patterns at carefully selected frequencies and durations, the system achieves high data rate transmission while the periodic nature helps manage Inter Symbol Interference through predictable signal structures that facilitate easier detection and mitigation
Data Source
AI summary
A method and a device for transmitting a wakeup packet in a wireless LAN system are suggested. Particularly, a transmission device configures a wakeup packet and transmits same to a reception device. The wakeup packet includes a sequence including first information and second information, by applying an OOK method. The first information and the second formation are configured with an on-signal and an off-signal. The on-signal is transferred via a first symbol generated by applying a first sequence to K number of successive subcarriers in the 20 MHz band and performing 64-point IFFT on the subcarriers. The offsignal is transferred via a second symbol generated by applying a second sequence to the K number of successive subcarriers in the 20 MHz band and performing 64-point IFNT on the subcarriers. Of the K number of subcarriers to which the first sequence is applied, a coefficient for m number of subcarriers as a unit is set to 1 or −1 for the subcarriers, and a coefficient for the remaining subcarriers is set to 0. The first information and the second information are transmitted via a third symbol configured with the first symbol and the second symbol, respectively.