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Most of IoT applications include large number of distributed sensors which are interesting in specific geographical area. A large number of IoT entities have multiple relations and dynamic connections with each other. And there are many group communication requirements. Flexible multicast mechanism will be essential in such environments but it is difficult to satisfy verious requirements by means...
Reliability, interoperability and efficiency are fundamental in Wireless Sensor Network deployment. Herein we look at how transmission power control may be used to reduce interference, which is particularly problematic in high-density conditions. We adopt a distributed approach where every node has the ability to learn which transmission power is most appropriate, given the network conditions and...
One of the major challenges in Dynamic Spectrum Access (DSA) systems is to guarantee a required level of Quality of Service (QoS) to secondary users of the spectrum. In this paper, we propose efficient algorithms for deriving optimal policies for the sensing / transmitting trade-off in hardware-constrained DSA systems. Unlike previous approaches which seek to maximize mean data rate for the secondary...
We consider the problem of serving a set of sensors/end-users at multi-level quality of service. Consider for example the problem, which arises in augmented reality applications, of single-hop radio broadcasting a common content from a provider. Each end-user requires a minimal quality level of the common content. The provider must satisfy all end-users at their required minimal quality level with...
Wireless Sensor Networks are gaining more and more importance in present era. Recent Advances in WSN have extended the applicability of these to wide range of real time applications. In these applications, energy is one of the scarce resources. Hence, the main goal of any application using WSN is to spend less energy and extend the lifetime of the WSN. For any type of network communication, quality...
Secondary Users (SUs) in a Cognitive Radio Network (CRN) face unpredictable interruptions in transmission due to the random arrival of Primary Users (PUs), leading to spectrum handoff or dropping instances. An efficient spectrum handoff algorithm, thus, becomes one of the indispensable components in CRN, especially for real-time communication like Voice over IP (VoIP). In this regard, this paper investigates...
Cloud computing is a key enabler for the development and deployment of large-scale IoT service platforms. The integration into such platforms of different sensing and actuating systems will imply the availability of many similar IoT services with common functionalities though with different QoS and cost. A cloud-based IoT platform can then benefit from implementing QoS-aware service selection algorithms...
In a mobile crowd sensing system, a smartphone undertakes many different sensing tasks that demand data from various sensors. In this paper, we consider the problem of scheduling different sensing tasks assigned to a smartphone with the objective of minimizing sensing energy consumption while ensuring Quality of SenSing (QoSS). First, we consider a simple case in which each sensing task only requests...
The realization of the Internet of Things (IoT) paradigm relies on the implementation of systems of cooperative intelligent objects with key interoperability capabilities. In order for objects to dynamically cooperate to IoT applications' execution, they need to make their resources available in a flexible way. However, available resources such as electrical energy, memory, processing, and object...
This paper studies how to manage a cognitive radio network (CRN) by trading off the cost of spectrum acquisition and the quality of service (QoS) in serving secondary users. Due to bursty nature of primary users' traffic and random realization of spectrum holes, it is difficult for a CRN operator to guarantee the QoS to its users by using the cheap but unreliable spectrum sensing only. Once the sensed...
A new control strategy based on dynamic matrix control algorithm is proposed in this paper to deal with delay and data packet dropout from sensor to controller as well as from controller to actuator in the networked control system. Through the port setting and sequence controlling at the controller and actuator, the new output of predictive model and the new sequence of predictive control are utilized...
Routing is critical in wireless sensor networks (WSNs). It has been widely studied in recent years and many new protocols have been proposed. In this paper, based on observations on event-driven wireless sensor networks, we propose algorithms to reduce power consumption and improve data quality in wireless sensor networks. In our algorithms, sensor nodes reduce the sampling frequency and number of...
Previously the cost and extremely limited capabilities of sensors prohibited quality of service (QoS) implementations in wireless sensor networks. With advances in technology, sensors are becoming significantly less expensive and the increases in computational and storage capabilities are opening the door for new, sophisticated algorithms to be implemented. Newer sensor network applications require...
We adopt the second-price auction mechanisms to solve the channel allocation as well as the out-band sensing assignment problems in cognitive radio. We introduce a cheating-proof operating method by realizing the pricing scheme in a real time format. To adapt to the dynamic environment, we also study the optimization problem in terms of strategic budget setting, bidding slot duration setting and supplementary...
A novel dynamic service architecture used to integrate radio-frequency identification (RFID) and wireless sensor networks (WSNs) is proposed according to requirements on the ubiquitous computing. An infrastructure used to monitor devices and collect data at real time is proposed, which constitutes with monitor service and container service. The monitor service provides the mechanism based on service...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
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