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The Session Initiation Protocol (SIP) is nowadays widely used as the primary standard application layer signaling protocol for multimedia sessions in the Internet. Furthermore, it is considered as the core protocol for the IP Multimedia Subsystem (IMS) of Next Generation Network architectures. Resources in the Internet are, however, still committed only on a best-effort basis, which proves to be especially...
Video traffic has been growing significantly and it is expected to be a large share of the future Internet traffic, within an increasingly mobile environment with scarce resources. In this context, new challenges arise, and energy-efficiency is becoming a key factor for the successful deployment of mobile networks. The development and validation of mechanisms for energy-efficient video transmission...
This article presents an architecture for managing the identification of applications responsible for generating traffic in a network. The identification is to be explored by network auditing systems, which cooperate with surveyed systems to get the relevant information about the source applications. The ultimate goal of the system is to provide network auditors, such as NIDS, enough information about...
In Peer-to-Peer (P2P) networks, nodes (peers) have symmetric roles. They are useful in a wide range of application scenarios, especially in relation to the Internet, such as file sharing and data retrieval. This work investigates the prospects for using self-organizing P2P networking in multiparty session applications such as presence and audio/video conferencing. The proposed architecture relies...
Measuring the energy consumption of a communication device is necessary in order to develop energy-aware and energy-efficient protocols and applications. There exist various approaches to determine the energy consumption of a device. This paper gives a structured overview on the state of the art of energy measurement and provides a detailed analysis of the advantages and drawbacks of each technique...
We develop an optimization framework for Quality of Experience (QoE)-based routing in multi-service Wireless Mesh Networks (WMNs). The framework takes into account the heterogeneous requirements of different services delivered over a WMN, such that the overall end-user QoE is maximized under given resource constraints. We propose a novel QoE-aware double reinforcement learning strategy for dynamically...
With Cloud Computing technology occupying the majority of future Internet research and development work, research on deploying and extending existing capabilities onto a newly emerging infrastructure becomes more significant. For example, extending the virtual network provisioning capability onto a Geo-distributed programmable layer-2 networking environment (G-PLaNE) is a novel attempt and is different...
Traffic monitoring and control is getting more and more important as the number of vehicles and traffic jams steadily grow. Nevertheless, traffic control is still predominantly done by visual means using strategically placed video cameras. To be more effective, proposals to improve the traffic conditions should consider automated monitoring systems. This work proposes an opportunistic system for collaborative...
We investigate the statistical properties of harvested power from a human motion based harvesting device. Based on empirical measurements, during normal daily activities, we provide models for the probability density function and the autocorrelation coefficient of the harvested power. The empirical measurements are collected from an accelerometer attached to the subject's ankle. The measured acceleration...
According to statistics data, the population of many countries is aging. Moreover, there is also a small sector of the population that is affected by disabilities. Researchers should develop systems to improve their quality of life. In recent years, the development of smartphones and reduced size devices, but with high processing capacity, has increased dramatically. We can take profit of the sensors...
In this paper we present a new data collection scheme using mobile actors in a large scale wireless sensor network (WSN). A mobile actor, or for convenience, M-actor is a mobile node that has powerful energy source, computation, and communication features. The mobile node is able to move freely through the sensor deployment, traversing through the radio transmission range of wireless sensor nodes...
The measurement of an emitter's position using electronic support passive sensors is termed passive geolocation. The emitting target could be in underwater environment. In this paper, we propose a Time Difference of Arrival (TDoA) algorithm for passive geolocation in underwater environment. In underwater environment, we apply a modified UWB Saleh-Valenzuela (S-V) model to characterize the underwater...
The effect of relaying in terms of energy efficiency is an important and interesting issue in cellular communications. In this paper, two relaying schemes for uplink are analyzed and compared in the context of cellular systems: Simple relaying (SR), where a user is served either by a relay node or the base station, and Cooperative Relaying (CR), where a user is served by the relay node, the base station...
As concerns about copyright protection increased amongst multimedia owners in recent years, many watermarking algorithms proposed to protect copyright of digital images. These methods are either spatial or frequency domain techniques. It is essential for a watermarking method to have acceptable robustness. That is why many existing methods try to improve their robustness against signal processing...
Unequivocally, one of the main challenges of the arising wireless world is to support the QoS-demanding services. However, the solutions that will be considered should not only take into account the optimization of the network performance, but should also be energy efficient both for the operator and the end-user. This paper presents the concept of Opportunistic Networks (ONs) as an energy efficient...
Hard energy constraints impose huge challenges to wireless communication under the constraint of communication delay. In this paper, we consider the problem of energy-efficient point-to-point transmission scheduling of delay sensitive multimedia data over a fading channel. We first formulate the transmission scheduling problem as a Markov Decision Process (MDP) and systematically unravel it by the...
The paper describes different research concepts of which the combination leads to an improvement of the power consumption per subscriber in a wireline access network by 10× and the energy efficiency per transferred bit by 100×.
The rapid developments in Internet-of-Things (IoT) and Machine-to-Machine (M2M) communication make it necessary to design communication systems operating in different wireless spectrum as an alternative to highly congested wireless access systems. In addition, the deployment of wireless smart meter devices is ramping up and it is expected that such devices will flood the market in the near future...
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