Battery-Free Wireless Node OTA Configuration Across Harvest Cycles
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Solution Overview
Problem
Conventional wireless sensor nodes require batteries for power, limiting their deployment, lifetime, and scalability, especially in IoT applications where maintenance-free, cost-effective, and configurable devices are needed.
Innovation Solution
The implementation of energy-autonomous, battery-free wireless sensor nodes that harvest energy from the environment and utilize an improved over-the-air (OTA) configuration, reconfiguration, and update procedure, allowing for firmware updates and configuration without the need for a stable power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If energy-autonomous battery-free wireless sensor nodes are used, then maintenance-free operation and cost-effectiveness are improved, but the ability to perform configuration, reconfiguration, and firmware updates is worsened due to insufficient energy availability
Solution Approach 1:
The system performs configuration data reception and processing in advance during specific energy harvesting cycles, preparing the device for future operational changes. Configuration data is received, validated, and stored in temporary memory before actual firmware updates are executed, ensuring that all preparatory energy-intensive operations are completed while energy is available.
Solution Approach 2:
The configuration and update process is divided into periodic phases synchronized with energy harvesting cycles. The system alternates between energy harvesting phases and configuration execution phases, with each phase occurring at predetermined intervals. This periodic structure ensures that energy-intensive operations only occur when energy thresholds are met, maintaining both maintenance-free operation and update capability.
2Adaptability or versatility
If configuration and firmware update operations are performed, then adaptability and versatility are improved, but energy consumption increases beyond what conventional energy harvesting can provide
Solution Approach 1:
The system dynamically adjusts its operational mode based on real-time energy availability. When energy thresholds are met, the system transitions from passive sensing mode to active configuration mode, enabling firmware updates and reconfiguration. This dynamic switching allows the device to perform high-energy operations only when energetically feasible, balancing adaptability with energy conservation.
Solution Approach 2:
The system changes operational parameters such as radio power levels, processing intensity, and memory usage patterns based on energy availability. During configuration operations, the system temporarily increases power consumption parameters, but only after verifying sufficient energy reserves. This parameter adjustment strategy enables configuration capability while controlling overall energy consumption within harvestable limits.
3Productivity
If configuration data is temporarily stored in wireless communication circuit memory, then configuration speed is improved, but energy consumption during data transfer increases
Solution Approach 1:
The configuration data transfer process is segmented into multiple small transactions rather than one large transfer. Configuration data is received and stored in temporary memory in discrete packets during separate energy harvesting cycles, with each packet transfer being independently managed. This segmentation reduces the peak energy demand of any single transfer operation while maintaining overall configuration speed through accumulated progress across multiple cycles.
Data Source
AI summary
A wireless device includes an energy harvester and an energy storage that operate in a sequence of energy harvesting cycles to alternately harvest energy and release energy for supplying the wireless device. The wireless device also includes a processing circuit and a wireless communication circuit. A configuration method for the wireless device includes first step where a base station receives a signal from the wireless device indicating wireless communication circuit entry into a receiving operation mode. In a second step, the base station transmits configuration data to the wireless device. The received configuration data is temporarily stored in a memory area of the wireless communication circuit. In a third step, the temporarily stored configuration data is transmitted from the wireless communication circuit to the processing circuit for storage in a memory area. The second and third steps are carried out during distinct energy harvesting cycles of the wireless device.