Journal of Embedded Systems & Its Applications ISSN: 3139-2296 (Online)

Authors: Arjun Mishra , Riya Sinha , Mohit Bhardwaj , Sana Ali

Abstract: Smart cities are increasingly becoming an urban development priority in many countries. As city services and infrastructure depend more on digitization, connectivity technologies that can cover large areas with low power and low cost are necessary. Low Power Wide Area Networks (LPWAN) such as LoRaWAN and NB-IoT have emerged as leading options for smart city applications including environment sensing, utility metering, intelligent transportation, and public safety. However, these technologies still face challenges in scalability, energy efficiency, interference mitigation, quality of service, and network capacity. This paper reviews the state of LPWAN technologies focusing on LoRaWAN and NB-IoT, identifying their strengths and limitations in smart city contexts. We then examine current research on protocol optimization strategies, including adaptive data rate, power control, collision avoidance methods, and resource scheduling. A comparative analysis highlights how optimization techniques can enhance system reliability, increase device lifetime, and reduce operational costs. We also propose a hybrid optimization framework combining best strategies for urban deployments. Finally, the paper discusses open challenges and future research directions necessary for widespread adoption of optimized LPWAN for smart cities.

Keywords LPWAN, LoRaWAN, NB-IoT, Smart Cities, Protocol Optimization, Scalability, Energy Efficiency, Network Capacity