Doru Todinca

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The goal of this paper is to investigate the efficiency of different algorithms used for resource allocation in data transfer over EGPRS networks. The focus is on the efficiency during congested periods in order to ensure reduced file transfer delay. A number of algorithms are presented for the resource allocation, and some generic mathematical results are(More)
In the component based software engineering approach, a software system is viewed as an assembly of reusable independently developed components. In order to produce automated tools to support the selection and assembly of components, rigorous specifications of components and performant retrieval and selection strategies based on these specifications are(More)
—It is generally considered that the wireless networks of the future will consist of several radio access technologies. In this context, the vertical handover (VHO) decision algorithms will increase in importance and in complexity, and the study of these algorithms becomes a hot research topics. In this work we propose a high-level OMNeT++ framework that(More)
—This article proposes an approach for including user preferences and quality of service characteristics in the selection process of services. Our approach consists of a Domain ontology for the service description vocabulary, and a trader that facilitates user-preference-based service selection, combining imperfect service matching and ranking algorithm.(More)
– This work proposes a new admission control algorithm for GPRS/EGPRS networks. The cellular networks are evolving from the 2 nd generation voice systems to 3 rd generation data and voice systems, and the classical admission control methods used for voice systems cannot efficiently cope with the new problems posed by the complex nature of data traffic and(More)
Recent technological improvements have made the deployment of small, inexpensive, low-power devices (nodes), which are capable of local processing and wireless communication, a reality. Such structure is called Wireless Sensor Network (WSN). Nowadays, a WSN node may include complex sensing devices like video cameras. This paper proposes a new routing(More)
As users in a GPRS/EGPRS network have different Quality of Service (QoS) demands, the network aims to satisfy their demands while maximizing the utilization of the existing resources. A crucial aspect of the resource allocation problem in cellular data networks is the admission control (AC). We propose a new session admission control algorithm that(More)
Many of the admission control strategies for cellular data networks proposed in the literature allow the network operator to use different policies, depending on the network load, the number of users from each quality of service class, etc. Each policy is applied in a certain region, the regions being separated by thresholds. Those approaches suffer from a(More)