Narrowband Internet of Things (NB-IoT) is a new cellular technology introduced in 3GPP Release 13 for providing wide-area coverage for the Internet of Things (IoT). This article provides an overview of the air interface of NB-IoT. It describes how NB-IoT addresses key IoT requirements such as deployment flexibility, low device complexity, long battery life time, support of massive number of devices in a cell, and significant coverage extension beyond existing cellular technologies.
In this paper, we provide an overview of recent developments in the domain of Machine-Type Communications (MTC) for current and next-generation wireless cellular systems. We describe existing MTC standards and discuss in more detail the necessity of novel solutions for massive access of machine-type devices to the mobile cellular network. In particular, we focus on recent developments in the domain of ALOHA-based random access, known as Coded Slotted ALOHA (CSA). We review recent results that show CSA is capable of dramatically increasing the throughput of ALOHA-based schemes, both in single base-station and multi-base station scenarios, making CSA one of the suitable candidates for future MTC.
Milos JOVANOVIĆ, Marko TAJDIĆ, Jovan KON
The system for public observation, informing and alerting represent alarm station capable to control several electromechanical systems and collect and transfer data to supervisory system. Some of the basic functions of alarm stations are the following: used to broadcast warning signals and/or voice messages and informing and alerting the population in case of danger, as well as the termination of hazard. System can be activated remotely and/or locally with the same station, if necessary, it can serve for monitoring the area where it is located. System has the function of self-diagnostic work and has autonomous power supply safety equipment. This control system, as its name suggests, is used to manage the alarm station and supervision. It is based on a microcontroller control board BeagleBoneBlack. Options of the control system are: local activation of electronic horns and broadcasting selected warning signals, broadcast voice from a microphone, which is located within the cabinet alarm station, broadcasting recorded voice messages from MicroSD card, local diagnostics of work alarm station and displaying on the touch screen display of signage correctness of work. I case of possible failure in the alarm station, system can inform a master control center about the problem. System also can realize commands to activate alert cues or speech signal from the master control center. The control system also supports remote communication; it has an Ethernet port, USB port, SPI communication protocol, RS-485 and RS-232 communication standards.
Education, as almost every other aspect of our lives, has not been immune to advancements in Information and Communication Technology (ICT). With the evolution of the Internet of Things (IoT), the vision of completely smart classroom has never been closer to reality. However, despite diverse benefits of novel technology solutions, manufacturing, distribution, and utilization of IoT products and systems are energy and resource intensive and accompanied by escalating volumes of waste and toxic pollutions. Hence, in order to maximize benefits and minimize harm to people and the environment, Green IoT (G-IoT) appears as the adequate solution. This paper analyzes the possibilities of the G-IoT utilization in the engineering education. Therefore, the main benefits, as well as challenges for the appliance of G-IoT vision in a smart classroom, have been discussed.