Terminal Device Wake-Up via Probe Request Frame Length Encoding
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Solution Overview
Problem
Wireless communication systems face challenges in waking up a wireless device that is not allocated to an access point, preventing the transmission of wake-up signals for controlling other devices.
Innovation Solution
A terminal device generates and transmits control probe requests with varying frame lengths representing an identifier, allowing control even when it cannot transmit a radio frame, using active scanning in a wireless LAN to wake up another device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device is not allocated to an access point, then it cannot transmit wake-up signals to control other devices, but this limitation prevents remote control functionality
Solution Approach 1:
The patent uses probe requests as an intermediary mechanism to transmit control signals. Instead of requiring direct allocation to an access point for control transmission, the terminal device embeds control information within probe request frames that are naturally exchanged during wireless scanning. This intermediary approach allows control functionality without traditional allocation requirements.
Solution Approach 2:
The probe request frame is made multi-functional by incorporating both its traditional role in wireless scanning and a new control signal transmission role. By encoding control information within the existing probe request structure, the same wireless mechanism serves dual purposes: network discovery and device control, eliminating the need for separate control channel allocation.
2Adaptability or versatility
If control information is embedded in probe requests with varying frame lengths, then control can be achieved without radio frame transmission allocation, but frame length variation increases detection complexity
Solution Approach 1:
The patent applies local quality by making specific portions of the probe request frame variable in length depending on the control information being transmitted. Rather than making the entire frame structure variable, only specific fields are adjusted to accommodate control data, allowing the receiver to detect and process control signals while maintaining overall frame structure recognition.
Solution Approach 2:
The probe request frame length is made dynamic rather than static, allowing it to adapt based on the amount of control information being transmitted. The frame structure can expand or contract to accommodate different control messages, enabling flexible control signal transmission while the receiver dynamically adjusts its detection parameters accordingly.
Data Source
AI summary
When a terminal device initiates a wireless communication when it has not established a wireless link between itself and another wireless device, it transmits, as a management frames in active scanning, a plurality of activation probe requests having frame lengths representing an identifier of a wireless base station to which connection is being made and which is intended to transition from sleep mode to operating mode. Then, the wireless base station receives the plurality of activation probe requests transmitted by the terminal device as management frames in active scanning in a wireless LAN, and, when a plurality of dummy network identifiers detected based on the received plurality of activation probe requests represent the identifier of its own, transitions from sleep mode to operating mode.