Gabriele Tamea

Learn More
Wireless Metropolitan Area Networks based on IEEE 802.16d/e standards are soon to be deployed in several countries. However, there is lack of published literature with results from actual testbeds. This paper introduces the work done in the EU Sixth Framework Programme Project WEIRD to design and set up WiMAX testbeds in four EU countries. We describe the(More)
Vertical handover (VHO) techniques are applied when mobile users require service continuity and a seamless roaming between heterogeneous networks. A VHO decision can be taken on the basis of physical parameters, such as the received signal strength (RSS), data rate and signal-to-interference and noise ratio (SINR). In this paper, we compare three VHO(More)
Choosing or switching between heterogeneous networks according to the highest performance in terms of quality of service is largely inefficient in vertical handover. In fact a service may have unstable performance and require highly frequent vertical handover procedures. In this paper we consider the impact of statistical fluctuations of performance(More)
Vertical handover is a new trend for heterogeneous next generation networks, in order to assure ubiquitous and seamless connectivity to mobile users. This paper presents a novel vertical handover algorithm based on a probabilistic approach for decision strategy. The proposed technique deals with the assessment of a Wrong Decision Probability (WDP), which(More)
Handover decision algorithms are essential components for the successful implementation of mobility which is the basic concept of mobile communication. These algorithms need to be designed to provide the required Quality of Service (QoS) to a wide range of applications while allowing seamless roaming among a multitude of access network technologies. Wrong(More)
Vertical handover (VHO) procedure facilitates service continuity in a heterogeneous wireless scenario under varying network as well as channel conditions. Decision criteria for VHO are, mainly, designed to maximize a combination of network parameters in order to guarantee a satisfying quality of service and maximize network operators and/our users(More)
This paper deals with the management of application QoS and session control in next generation home networks. These networks will be realized through the integration of heterogeneous communication technologies that will coexist and interoperate thanks to the introduction of a convergence layer, namely the Inter-MAC layer, as defined, for example, within the(More)
IEEE 802.16 networks provide mechanisms for QoS support at MAC level, but end-to-end QoS issues are not addressed in detail in the standards. This paper presents an analysis and an experimental validation of a comprehensive solution that describes and implements end-to-end QoS in networks with IEEE802.16e segments. A complete QoS model has been specified,(More)
The present thesis introduces decision criteria for the handover among heterogeneous wireless networks also known as vertical handover. The goal is to select the best network that can support the required service(s) and avoid excessive switching among different networks in order to minimize service interruptions and power consumption. Firstly we address the(More)
As the number of network service provider's increases so the numbers of handoffs are increases to avail the best quality of services within affordable cost. In such scenarios fast and secure handoff is obligatory but diversification always creates worries of intruders and latency due to heterogeneous architectures with multiple access points. And(More)