Passive IoT Attachment Control for Energy-Harvesting Duty Cycles
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Solution Overview
Problem
Passive IoT devices with limited energy capabilities, such as those using energy harvesting, face challenges in unreliable communication with 5G NR networks due to unpredictable energy availability and continuous monitoring requirements, leading to inefficiencies in data transmission and energy consumption.
Innovation Solution
A system where a reader node receives association information from a RAN node, including energy thresholds and monitoring time periods, to dynamically manage the operation duty cycle and extend data transmission periods based on energy levels and received data, optimizing energy use and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reader node continuously monitors for data transmission from passive IoT devices, then the reliability of data communication is improved, but the energy consumption of the reader node increases
Solution Approach 1:
The reader node transitions from continuous monitoring to periodic monitoring by implementing an operation duty cycle with alternating active and inactive periods. During active periods, the reader monitors for data transmissions from passive IoT devices, while during inactive periods, the reader enters a low-power state. This periodic action maintains communication reliability by ensuring regular monitoring intervals while significantly reducing overall energy consumption of the reader node.
2Loss of energy
If the reader node operates with a configured duty cycle to reduce energy consumption, then the energy efficiency is improved, but the monitoring coverage and data transmission reliability deteriorate
Solution Approach 1:
The system implements feedback mechanisms where passive IoT devices detect reader node activity through downlink signals and provide uplink feedback indicating their data transmission status. When devices detect the reader is in inactive mode, they can signal whether they have data ready for transmission. This feedback allows the reader to extend its active monitoring period when needed, maintaining data transmission reliability while minimizing unnecessary monitoring during low-activity periods.
3Productivity
If passive IoT devices with limited energy capabilities transmit data continuously, then the data availability to the network is improved, but the energy depletion of the devices accelerates
Solution Approach 1:
Passive IoT devices utilize periodic transmission opportunities aligned with the reader node's duty cycle. Instead of continuous transmission attempts, devices wait for reader active periods to transmit data, then enter low-power states. This periodic transmission approach maintains data productivity by ensuring regular data delivery windows while significantly reducing the energy consumption of passive IoT devices with limited power capabilities.
4Loss of information
If the reader node extends the monitoring time period to capture more data transmissions, then the data collection completeness is improved, but the energy consumption during active periods increases
Solution Approach 1:
The reader node implements dynamic monitoring period adjustment based on observed data transmission patterns and feedback from passive IoT devices. Rather than using a fixed extended monitoring period, the reader dynamically adapts its active monitoring duration - extending it when data transmission activity is detected and reducing it during low-activity periods. This dynamic approach ensures complete data collection when needed while minimizing energy consumption during extended active periods.
Data Source
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AI summary
In a system, apparatus, method, and non-transitory computer readable medium related to attachment procedures for passive Internet of Things (IoT) device communication with ambient energy sources, wherein a reader node is caused to, receive an association response message from a radio access network (RAN) node, the association response message including attachment information corresponding to at least one associated energy-harvesting (EH) user equipment (UE) device and the reader node, and transmit an attachment acknowledgement message to the RAN node in response to the association response message.