Batteryless Device Transmission Feedback via Physical Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Batteryless devices in wireless networks face limitations due to energy constraints, leading to reduced device lifetime, labor-intensive battery replacement, and inefficient energy use, as well as inability to adapt to configuration changes and channel shifts, resulting in packet collisions and corrupted communication.
Innovation Solution
A method for batteryless devices to receive feedback on transmission success or failure through means differing from the communication interface, allowing them to skip unnecessary retransmissions and conserve energy, using an energy-harvesting circuit and storage for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If batteryless devices perform multiple fixed retransmissions to ensure communication reliability, then transmission reliability is improved, but energy consumption increases and collision probability increases
Solution Approach 1:
The patent implements a feedback mechanism where the batteryless device senses physical changes (light, temperature, etc.) resulting from the controlled device's operation to determine whether the control frame was successfully received. This feedback allows the device to adapt its retransmission behavior dynamically, performing retransmissions only when necessary, thereby reducing energy consumption while maintaining communication reliability.
Solution Approach 2:
The patent transforms the static, fixed retransmission count into a dynamic parameter that adjusts based on actual communication outcomes. The device determines the number of retransmissions needed by sensing physical changes, making the retransmission strategy adaptive rather than predetermined, thus optimizing energy usage while ensuring reliability.
2Reliability
If batteryless devices perform multiple fixed retransmissions without acknowledgment, then transmission reliability is improved, but device complexity increases due to inability to adapt to configuration changes
Solution Approach 1:
The feedback mechanism enables the batteryless device to detect whether its control frames are being successfully received by sensing physical changes. This information allows the device to adapt to network configuration changes and channel conditions dynamically, improving both reliability and adaptability simultaneously.
Solution Approach 2:
The batteryless device autonomously determines its own retransmission needs by sensing physical changes, without requiring complex external acknowledgment protocols. This self-service approach simplifies the system while enabling adaptive behavior in response to configuration changes and channel conditions.
3Use of energy by moving object
If retransmissions are sent without CSMA/CA mechanism for energy saving, then energy consumption is reduced, but packet collisions increase and communication is corrupted
Solution Approach 1:
The patent applies CSMA/CA mechanism selectively rather than universally - it is used when the device determines retransmission is necessary based on physical sensing feedback, but not for every transmission attempt. This partial application of the channel access mechanism reduces overall energy consumption while preventing collisions when they would be harmful.
Data Source
AI summary
The present invention relates to a method for controlling transmissions of a batteryless device (1) operating in a wireless network, the method comprising the following steps: the batteryless device (1) transmitting a frame including elements for controlling operation of a remote device (2a), or controlled device, the batteryless device being configured with a predetermined number of planned retransmissions of the control frame, the batteryless device sensing a change in the physical phenomenon induced by operation of the controlled device (2a), the batteryless device determining, based on the sensing step, the success or failure of the frame transmission, in case the transmission has succeeded, the batteryless device omitting further retransmissions of the control frame. The present invention also relates to a batteryless device carrying out such method.