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—Radio Frequency Identification (RFID) is an emerging wireless technology that poses new fundamental challenges. Coverage in RFID networks, which is one of these challenges, is the ability to accurately read a set of RFID tags. Accurate coverage is of utmost importance in RFID networks as missing some tags may result in missing important events and, for(More)
The proliferation of wireless sensors has given rise to public sensing (PS) as a vibrant data-sharing model. This vision can be extended under the umbrella of the Internet of Things (IoT) to include versatile data sources within smart cities such as cell phones, radio frequency identification tags and sensors on roads, and buildings and living spaces. The(More)
—Deployments of Radio Frequency Identification (RFID) networks are anticipated to be dense and ad-hoc. These deployments usually involve redundant readers having overlapping interrogation zones and, hence, causing immense reader collisions. Elimination of redundant readers, from the network, is of utmost importance as otherwise they affect the lifetime and(More)
The Internet of Things (IoT) represents an evolutionary vision that promises to identify and connect physical objects and devices. This vision faces many challenges in terms of integrating technologies, especially RFID-sensor networks (RSNs). In this paper, we introduce a framework for node deployment and delay-tolerance in RSNs under the IoT paradigm. Our(More)
Enabling high performance, persistent mobile computing has recently become a very active research area. The widespread popularity of mobile computing devices, such as laptops, handheld devices and cell phones, as well as the recent advances in wireless communication technologies are the principal motivators of this research area. However, battery energy(More)
—Radio Frequency IDentification (RFID) is a wireless technology that promises to facilitate many identification and tracking solutions. The placement problem, i.e. choosing the optimal locations for RFID readers, tags or both in a given RFID layout, is reviewed in this paper. Placement approaches are generally coverage-driven and vary according to the(More)
Advances in sensing and wireless communication technologies have enabled a wide spectrum of Outdoor Environment Monitoring applications. In such applications, several wireless sensor network sectors tend to collaborate to achieve more sophisticated missions that require the existence of a communication backbone connecting (federating) different sectors.(More)
A major challenge affecting the lifetime of Wireless Sensor Networks (WSNs) comes from the unbalanced energy consumption over different parts of the network. This unbalanced energy consumption is a direct result of having a stationary sink: nodes near the sink are intensively used to relay data for other nodes to the sink. A natural solution to such a(More)