Performance Evaluation of LoRaWAN for Green Internet of Things

Zulfiqar Ali,Mohsin Raza,Sung Won Kim,Shagufta Henna,Adnan Akhunzada

doi:10.1109/access.2019.2943720

Abstract

LoRa is a long-range, low power and single-hop wireless technology that has been envisioned for Internet of Things (IoT) applications having battery driven nodes. Nevertheless, increase in number of end devices and varying throughput requirements impair the performance of pure Aloha in LoRaWAN. Considering these limitations, we evaluate the performance of slotted Aloha in LoRaWAN using extensive simulations. We employed packet error rate (PER), throughput, delay, and energy consumption of devices under different payload sizes and varying number of end devices as benchmarks. Moreover, an analytical analysis of backlogged and non-backlogged under slotted Aloha LoRaWAN environment is also performed. The simulation shows promising results in terms of PER and throughput compared to the pure Aloha. However, increase in delay has been observed during experimental evaluation.Finally, we endorse slotted aloha LoRaWAN for Green IoT Environment.

Highlights

An advent to the Internet of Things (IoT) has demonstrated significant applications in industry, healthcare, smart agriculture, smart cities, connected vehicles and environmental monitoring [1]
All the possible cases are taken in to considerations to analyze the performance of slotted Aloha in Long Range Wide Area Network (LoRaWAN)
The simulations results clearly shows for all the above scenarios that slotted Aloha is more suitable for delay tolerant applications

Summary

INTRODUCTION

An advent to the Internet of Things (IoT) has demonstrated significant applications in industry, healthcare, smart agriculture, smart cities, connected vehicles and environmental monitoring [1]. A massive increase in the number of IoT devices in the decade to come is expected to impose huge capacity requirements on the backbone connectivity provided by the low power wide area network (LPWAN) technologies. A medium access mechanism can be related to the applications and dynamics of environment operating in a low power wide area network, where a change in payload size or number of end devices can severely impair network’s performance [10]. Authors have evaluated the capacity of slotted Aloha under different transmission densities and have demonstrated almost double performance over CSMA [26]. We perform simulations to analyze the performance of slotted Aloha in terms of energy efficiency, throughput, and packet error rate, and delay under varying packet load sizes and number of end devices.

UNCOORDINATED CHANNEL ACCESS SCHEMES

CHALLENGES IN LPWAN CHANNEL ACCESS SCHEMES

MARKOV CHAIN MODEL FOR SLOTTED ALOHA

VIII. CONCLUSION