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Current centralized cloud datacenters provide scalable computation- and storage resources in a virtualized infrastructure and employ a use-based "pay-as-you-go" model. But current mobile devices and their resource-hungry applications (e.g., Speech-or face recognition) demand for these resources on the spot, though a mobile device's intrinsic characteristic is its limited availability of...
Consumption of multimedia content is moving from a residential environment to mobile phones. Optimizing Quality of Experience -- smooth, quick, and high quality playback -- is more difficult in this setting, due to the highly dynamic nature of wireless links. A key requirement for achieving this goal is estimating the available bandwidth of mobile devices. Ideally, this should be done quickly and...
As mobile ad-hoc networks (MANETs) continue to receive an increasing attention in research due to its vast amount of applications, security is becoming one of the main research challenges. Most of the proposed research in MANET security focused on secure routing and key management. In this paper, we propose an access control mechanism with features that is inherited to produce a secure address auto-configuration...
Many of the models used to analyze the performance of wireless networks assume stationary traffic behaviors where the average state-changing event times are constant. Various analysis of real traffic traces have shown that such behaviors in mobile wireless networks vary periodically during the day and night. Other systems also exhibit a similar behavior. A better analysis of the network's performance...
A reputation system for MANETs is described that attempts to deduce nodal trustworthiness (forwarding behaviour) from observed end-to-end path performance. The trustworthiness deduction algorithm produces interval estimates and works well if node misbehaviour is not selective with respect to traversing paths. Nodal reputation levels are next calculated in the spirit of generous tit-for-tat so as to...
In this paper, we present a data collection protocol for wireless sensor networks employing a number of mobile sinks. For satisfying timely delivery of sensory data to mobile sinks, sinks are forced to visit only an appropriate number of rendezvous nodes while the remaining nodes send their data through multi-hop communication toward these nodes. The proposed approach achieves prolonged network lifetime...
In future generation mobile systems information about social networking structures of users will be fundamental, being a key element for social networking applications, and a crucial contextual information for personalising the behaviour of mobile applications/services. In this paper, we focus specifically on the detection of ego networks. They are networks formed by an individual (ego) and all the...
Multimedia services are currently commonly available on mobile devices. Due to networks' convergence and migration to all-IP networks, mobility management at network layer is required. Moreover, nowadays it is popular to equip mobile devices with more than one wireless interface. Thus, soft handovers can be implemented, which means that an existing connection is removed after a new one is established...
Introducing an IP-based communication system into the mountain rescue domain would enable carrying out search and rescue missions in an effective way. With efficient mobility and multihoming support, a Mountain Rescue Team would be able to establish more effective and reliable Internet communication. In this paper, we present the Multihomed Mobile Network Architecture (MMNA), a comprehensive multihomed...
Mobile operators are today facing the daunting challenge of providing cheap and valuable services to ever more demanding customers. As a matter of fact, mobile standards have not yet really addressed this expectation of open, cheap and flexible web oriented internet access. As an alternative, we introduced an IP-centric QoS model mainly inspired by IP policies commonly found in fixed networks. In...
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