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On-Demand LoRa: Asynchronous TDMA for Energy Efficient and Low Latency Communication in IoT
Rajeev Piyare1, Amy L Murphy2, Michele Magno3
1Fondazione Bruno Kessler, Via Sommarive 18, Povo, 38123 Trento, Italy. piyare@fbk.eu.
Sensors (Basel, Switzerland)
|November 4, 2018
Summary
This study introduces an energy-efficient network for the Internet of Things (IoT) using LoRaWAN and a novel Time-Division Multiple Access (TDMA) protocol. The new system significantly reduces latency and eliminates packet collisions for reliable, long-range communication.
Area of Science:
- Computer Science
- Electrical Engineering
- Wireless Communication
Background:
- Energy efficiency is critical for battery-powered Internet of Things (IoT) devices, especially for long-range wireless communication.
- Existing Low-power Wide-Area Network (LPWAN) technologies like LoRaWAN face challenges including data latency, limited device control, and packet collisions in dense networks.
Purpose of the Study:
- To develop an energy-efficient network architecture and communication protocol for IoT applications.
- To improve the energy efficiency and reduce latency compared to standard LoRaWAN networks.
- To address drawbacks of LoRaWAN such as latency, device control, and packet collisions.
Main Methods:
- Proposed an energy-efficient network architecture integrating short-range wake-up radios with long-range LoRa connectivity.
- Developed a high-efficiency, on-demand Time-Division Multiple Access (TDMA) communication protocol.
- Combined asynchronous communication with wake-up radios for ultra-low power states and TDMA for efficient LoRa usage.
Main Results:
- Achieved a 100% packet delivery ratio by eliminating packet collisions through the on-demand TDMA protocol.
- Demonstrated round-trip latency on the order of milliseconds.
- Sensing devices consume less than 46 mJ when active and 1.83 μW during inactivity, enabling up to three years of battery life.
Conclusions:
- The proposed network architecture and on-demand TDMA protocol significantly enhance energy efficiency and reduce latency in IoT applications.
- The system overcomes key limitations of standard LoRaWAN, offering a robust solution for long-range, low-power IoT deployments.
- The approach ensures reliable data transmission and extended device operational lifespan, suitable for various IoT scenarios.
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