Sensor Node State Switching for Power-Constrained Abnormality Notification
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Solution Overview
Problem
In sensor network systems, intermittent operation of sensor nodes leads to high power consumption due to continuous operation of reception circuits during idle periods, making it difficult to efficiently notify abnormalities without depleting battery power.
Innovation Solution
Sensor nodes switch between states to conserve power, using a first state for charging and a third state to receive emergency event signals with higher transmission power, and a second state for data transmission with lower power, while refraining from receiving abnormality signals in a fourth state, optimizing power usage and notification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reception circuits operate continuously during idle periods to enable abnormality notification, then notification reliability is improved, but power consumption increases
Solution Approach 1:
The reception circuits operate periodically rather than continuously. The system divides time into intervals with operation states and idle states, where reception circuits are activated only during operation states to receive abnormality notification signals, and remain inactive during idle states to conserve energy.
Solution Approach 2:
The system dynamically switches the operational state of reception circuits based on time intervals. The sensor nodes alternately enter operation states where reception circuits are active and idle states where they are inactive, adapting the system's energy consumption profile to match the periodic nature of data collection and transmission requirements.
2Use of energy by moving object
If sensor nodes operate intermittently to save power, then power consumption is reduced, but abnormality detection capability deteriorates
Solution Approach 1:
The system prepares for abnormality detection by establishing a periodic operation schedule in advance. During operation states, reception circuits are pre-configured to be active and ready to receive abnormality notification signals, ensuring detection capability is maintained whenever the system is active without requiring continuous operation.
Solution Approach 2:
The periodic operation states act as an intermediary mechanism between continuous operation and complete idle states. During these intermediate operation states, the system maintains sufficient reception capability to detect abnormalities while consuming significantly less power than continuous operation would require.
3Use of energy by moving object
If reception circuits are inactive during idle periods to reduce power consumption, then power efficiency is improved, but response time to abnormalities increases
Solution Approach 1:
The system uses periodic operation intervals strategically designed to balance power consumption and response time. By activating reception circuits at regular intervals rather than continuously, the system achieves acceptable response times for abnormality detection while dramatically improving power efficiency compared to continuous operation.
Solution Approach 2:
The system changes the operational parameters of reception circuits by switching between active and inactive states based on the periodic schedule. This parameter change allows the system to optimize the balance between response time and power consumption by adjusting the frequency and duration of operation states.
Data Source
AI summary
A sensor node among sensor nodes that synchronously switch between a first state and a second state transmits an abnormality notification signal to a collecting apparatus when in the first state and an abnormality occurs at the sensor node. The sensor node, when in the second state, transmits to the communications apparatus, a data signal that differs from the abnormality notification signal. During each interval of the first state, the sensor node enters a third state during a first partial interval of the interval of the first state, and receives and transfers an abnormality notification signal transmitted by another sensor node among the sensor nodes. During each interval of the first state, the sensor node further enters a fourth state during a second partial interval of the interval of the first state and different from the first partial interval, and refrains from receiving the abnormality notification signal.