IoT Connectivity Technologies and Applications: A Survey

Abstract

The Internet of Things (IoT) is rapidly becoming an integral part of our life and also multiple industries. We expect to see the number of IoT connected devices explosively grows and will reach hundreds of billions during the next few years. To support such a massive connectivity, various wireless technologies are investigated. In this survey, we provide a broad view of the existing wireless IoT connectivity technologies and discuss several new emerging technologies and solutions that can be effectively used to enable massive connectivity for IoT. In particular, we categorize the existing wireless IoT connectivity technologies based on coverage range and review diverse types of connectivity technologies with different specifications. We also point out key technical challenges of the existing connectivity technologies for enabling massive IoT connectivity. To address the challenges, we further review and discuss some examples of promising technologies such as compressive sensing (CS) random access, non-orthogonal multiple access (NOMA), and massive multiple input multiple output (mMIMO) based random access that could be employed in future standards for supporting IoT connectivity. Finally, a classification of IoT applications is considered in terms of various service requirements. For each group of classified applications, we outline its suitable IoT connectivity options.

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• RIS-Assisted Coverage Enhancement in Millimeter-Wave Cellular Networks
• Energy-Efficient MAC for Cellular IoT: State-of-the-Art, Challenges, and Standardization
• Energy-Efficient Wake-Up Signalling for Machine-Type Devices Based on Traffic-Aware Long-Short Term Memory Prediction
• Subcarrier-wise Backscatter Communications over Ambient OFDM for Low Power IoT
• IoT-based Analysis for Smart Energy Management
• Joint User and Data Detection in Grant-Free NOMA with Attention-based BiLSTM Network
• A Federated Learning-enabled Smart Street Light Monitoring Application: Benefits and Future Challenges
• Modeling RIS Empowered Outdoor-to-Indoor Communication in mmWave Cellular Networks
• Internet of Mirrors for Connected Healthcare and Beauty: A Prospective Vision
• Introduction to IoT
• Communication-Efficient Distributed SGD using Preamble-based Random Access
• Data-aided Sensing for Gaussian Process Regression in IoT Systems