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Thessaloníki, Greece

Androulidakis I.,University of Ioannina | Vlachos V.,Technological Educational Institute of Larissa | Chatzimisios P.,CSSN Research Laboratory
International Conference on Information and Digital Technologies, IDT 2015 | Year: 2015

Unlike confidentiality and privacy concerns, the preservation of mobile phone service availability has not received the same attention from researchers, albeit an important factor, especially in business but also in life threatening situations. In this paper we present a methodology for testing practical battery deprivation denial of service attacks in mobile phones. We focus on attacks against the mobile terminal and not against the network. A variety of scenarios is proposed encompassing stealth Short Message Service messages (SMS), as well as very short calls interrupted before the phone actually rings. Both techniques are invisible to the target under attack and force the mobile phone to continuously transmit, consuming energy up to the point of complete battery depletion. Current flow and thus power consumption can be measured using a hardware based logger while a thermal camera can further measure the rise in temperature. Preliminary results show that it is trivially easy to launch an effective denial of service attack, with minimal cost and resources. © 2015 IEEE. Source

Sgora A.,University of Piraeus | Vergados D.D.,University of Piraeus | Chatzimisios P.,CSSN Research Laboratory
Proceedings - IEEE Symposium on Computers and Communications | Year: 2010

Ubiquitous service delivery requires the selection of the optimal access network in a heterogeneous wireless environment. However, since the selection of an access network in such an environment depends on several parameters with different relative importance (such as the network and the application characteristics, the user preferences, the service cost), it is a difficult task to be achieved. In this paper, an effective access network selection algorithm for heterogeneous wireless networks is proposed that combines two Multi Attribute Decision Making (MADM) methods, the Analytic Hierarchy Process (AHP) method and the Total Order Preference by Similarity to the Ideal Solution (TOPSIS) method. More specifically, the AHP method is used to determine weights of the criteria and the TOPSIS method is used to obtain the final access network ranking. © 2010 IEEE. Source

Lagkas T.D.,University of Western Macedonia | Stratogiannis D.G.,National Technical University of Athens | Chatzimisios P.,CSSN Research Laboratory
Telecommunication Systems | Year: 2013

Modern wireless networks are offering a wide range of applications that require the efficient integration of multimedia and traditional data traffic along with QoS provision. The IEEE 802.11e workgroup has standardized a new QoS enhanced access scheme for wireless LANs, namely Hybrid Control Function (HCF). HCF consists of the Enhanced Distributed Channel Access (EDCA) and the Hybrid Control Channel Access (HCCA) protocols which manage to ensure QoS support. However, they exhibit specific weaknesses that limit network performance. This work analyzes an alternative protocol, called Priority Oriented Adaptive Polling (POAP). POAP is an integrated channel access mechanism, is collision free, it employs priorities to differentiate traffic in a proportional way, it provides fairness, and generally supports QoS for all types of multimedia applications, while efficiently serving background data traffic. POAP is compared to HCF in order to examine the wireless network performance when serving integrated traffic. © 2011 Springer Science+Business Media, LLC. Source

Zheng Q.,Beijing University of Posts and Telecommunications | Zheng K.,Beijing University of Posts and Telecommunications | Chatzimisios P.,CSSN Research Laboratory | Liu F.,RWTH Aachen
Eurasip Journal on Wireless Communications and Networking | Year: 2015

Vehicular networks are a cornerstone of the envisioned intelligent transportation system (ITS) by enabling vehicles to communicate with each other via vehicle-to-vehicle (V2V) communications to overcome the current and future needs for increasing traffic safety and efficiency. In this paper, we employ the knapsack problem (KP) to formulate the problem of cooperative scheduling and radio resource management in vehicular networks for non-real time services. For the sake of maximizing sum utility (MSU) of the networks, we propose two-dimensional-multi-choice knapsack problem (2D-MCKP)-based scheduling scheme to select the coordinator vehicles for the sink vehicle and allocate radio resource to V2V and vehicle-to-infrastructure (V2I) links to solve the MSU optimization problem. Simulation results indicate that the proposed scheme significantly improves the average utility and average data rates with sustainable computational complexity. Moreover, the designed cooperative communication system achieves higher spectral efficiency and better fairness. © 2015, Zheng et al. Source

Chochliouros I.,A+ Network | Chatzimisios P.,CSSN Research Laboratory
IEEE International Conference on Communications | Year: 2012

This paper focuses on the presentation of a simulation framework, prototyping environment and demonstration scenario developed in the context of the Self-NET Future Internet mechanisms. Self management mechanisms of Future Internet elements are introduced, which incorporate the Monitoring, Decision making and Execution cognitive cycles. Such functionality enables the envisaged elements to sense their environment and adapt to it dynamically. The scenario described here is the one related to coverage and capacity optimization. The cognitive framework of the network elements and the implemented Future Internet mechanisms are presented, along with the findings originated by the performance measurements on the developed prototypes. In order to enable the evaluation of the proposed schemes, a set of assessment metrics are identified and the scenario is fragmented in simpler test cases. © 2012 IEEE. Source

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