IoT Terminal Device Activation Detection Reliability
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Solution Overview
Problem
Existing wireless communication systems for IoT devices face challenges in preventing erroneous detection of activation instruction frames, leading to unnecessary power consumption and reduced device lifespan due to the difficulty in managing the duty ratio when multiple receivers are activated simultaneously.
Innovation Solution
A wireless communication system where terminal devices include an instruction frame detection unit and a control unit that shift operation modes based on the number of successful detections of the activation instruction frame, allowing for optimized detection intervals and reducing erroneous activations by transitioning to a transmission mode only after consecutive successful detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device transitions to detection mode frequently to detect activation instruction frames, then the reliability of activation detection is improved, but the power consumption increases and device lifespan decreases
Solution Approach 1:
The terminal device performs detection processing at periodic detection timings rather than continuously. The gateway device transmits activation instruction frames at periodic transmission intervals. This periodic operation allows the device to remain in low-power sleep mode between detection cycles, significantly reducing power consumption while maintaining reliable detection capability when needed.
Solution Approach 2:
The terminal device autonomously determines whether to transition from sleep mode to detection mode based on its own detection needs and the received signal characteristics. The device self-manages its power state transitions without requiring continuous external control, optimizing its own power consumption while maintaining detection reliability.
2Speed
If the terminal device transitions to communication mode upon detecting a signal similar to the activation instruction frame, then the responsiveness to activation requests is improved, but erroneous activations occur leading to unnecessary power consumption
Solution Approach 1:
The terminal device performs detection processing to evaluate received signals against the expected activation instruction frame format and characteristics. This feedback mechanism allows the device to distinguish between valid activation frames and similar-looking interference signals, preventing erroneous activations while maintaining fast response to legitimate requests.
Solution Approach 2:
The detection processing examines multiple parameters of the received signal including frame format, signal characteristics, and timing properties. By checking multiple parameters rather than relying on a single feature, the system achieves high detection accuracy that distinguishes valid activation frames from similar interference signals.
3Speed
If the gateway device transmits activation instruction frames at short intervals, then the activation speed is improved, but the duty ratio management becomes difficult and power consumption increases
Solution Approach 1:
The gateway device transmits activation instruction frames at optimized periodic intervals rather than continuously or at fixed short intervals. This periodic transmission strategy achieves fast activation when needed while maintaining efficient duty ratio management, reducing unnecessary transmissions that would waste power and interfere with multiple receiver coordination.
Data Source
AI summary
One aspect of the present invention is a wireless communication system including: one or more terminal devices of which operation mode transitions between a first mode in which a wireless signal can be intermittently detected and a second mode in which data can be transmitted or received; and a gateway device that transmits, at a predetermined transmission interval, an instruction frame instructing the one or more terminal devices to shift to the second mode, wherein the one or more terminal devices each include an instruction frame detection unit that performs detection processing on the instruction frame, and a control unit that shifts an operation mode of the device from the first mode to the second mode on the basis of the number of times the instruction frame is detected.