In Internet of Things (IoT) sensory environment Wireless Sensor Networks (WSNs) are connected to the Internet through gateways and this gives birth to many real time sensor based applications. Applications from Internet querying for Spatio-temporal information within WSN may require query decomposition. Decomposition of queries may result in tasks having similar functional and Quality of Servic...

The performance evaluation of large multihop networks in terms of the standard quality of service parameters such as latency, throughput, network utilization, etc., is often performed with the use of discrete-event simulation tools which would require substantial computational resources with the increase of the number of nodes in the network. An alternative approach is considered in this contri...

The increasing demand for real-time applications has made the Quality of Service (Qos) support for wireless sensor networks (WSN) a fairly new research framework. In this paper, we propose an extended model of the Beacon enabled IEEE 802.15.4 including the Guaranteed Time Slot GTS allocation mechanism in the aim to analyze and evaluate network performances. Series of extensive simulations were ...

Traac models are at the heart of any performance evaluation of telecommunications networks. An accurate estimation of network performance is critical for the success of broadband networks. Such networks need to guarantee an acceptable quality of service (QoS) level to the users. Therefore, traac models need to be accurate and able to capture the statistical characteristics of the actual traac. ...

Traac models are at the heart of any performance evaluation of telecommunications networks. An accurate estimation of network performance is critical for the success of broadband networks. Such networks need to guarantee an acceptable quality of service (QoS) level to the users. Therefore, traac models need to be accurate and able to capture the statistical characteristics of the actual traac. ...

The provisioning of Quality-of-Service and the interworking between heterogeneous mobile environments will be of vital importance for the future economic success of mobile telecommunications. This paper presents a strictly practical performance evaluation of live and lab UMTS/GPRS/WLAN networks as performed within the project WISQY – Wireless Inter-System Quality-ofService. We report on experim...

In this paper, we propos e a new algorithm in reversible data hiding, with the applications of copyright and privacy protection for natural image s. Security issues for digital images have long been an important topic in research and practical applications, and reversible data hiding has attracted more and more attention. Unlike conventional schemes, we take the prediction of luminance values a...

Wireless networks providing QoS guarantees need to estimate the increase in peak allocated capacity when considering admitting a new resource reservation in the system. In this paper we analyze different available approaches to compute this capacity increase and, based on their limitations, propose the E-Diophantine solution along with two heuristics of polynomial complexity: E-Diophantine-W an...

This paper demonstrates a distributed on-line service selection(probe/access) scheme: optimal stopping web service selection scheme based on the rate of return problem from optimal stopping theory. There are three differences between our scheme and the conventional schemes. Firstly, it does not need to probe all web services, and only probe a few web services. Secondly, our scheme focuses on ma...

Heterogeneous cellular networks may be defined by several parameters that determine their performance, being known as the Key Performance Indicators (KPIs).. In order to guarantee a desired Quality of Service (QoS) a proper balance of these parameters is required. An approach to integrate a set of KPIs into a single one, is presented by using a Cost Function (CF). The CF takes these KPIs into a...