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Abstract-In this paper, we address the physical-layer security of two-way (bi-directional) transmissions of two terminals with the help of multiple relay nodes in the presence of an eavesdropper, where each node in the network is only equipped with single antenna. The secrecy sum rate is used as the metric of security, which is the rate difference between the legitimate information exchange between...
In this paper we study the quality of service (QoS) and energy performance of the carrier sense multiple access with collision avoidance (CSMA/CA) based 802.11p scheme, and our previously proposed modified version of packet reservation multiple access (M- PRMA) scheme for a vehicle-to-roadside (V2R) network in a motorway environment. The simulation results illustrate the deficiency of the 802.11p...
In this paper, we determine packet scheduling policies for efficient power management in Energy Harvesting Sensors (EHS) which have to transmit packets of high and low priorities over a fading channel. We assume that incoming packets are stored in a buffer and the quality of service for a particular type of message is determined by the expected waiting time of packets of that type of message. The...
Wireless mesh networks (WMNs) are expected to be a next step toward future generation of wireless networks due to their rapidly deployable nature and to the wide variety of their potential use. On the other hand, the daily increase of multimedia applications over wireless networks has generated a vital need to provide Quality of Service (QoS) support in WMNs, and works in this area are not sufficient...
Accurately measuring the available bandwidth information is critical for providing QoS assurance, especially for the bandwidth-limited 802.11-based wireless networks. However, the shared nature of wireless medium and IEEE 802.11 MAC pose great challenges for estimating the bandwidth accurately. This paper tends to tackle this issue. In particular, we first formally define the available bandwidth in...
In this paper, we investigate the impact of relay cooperation for maintaining coverage area against aggregate interference from incumbent underlaid interferers. We employ a guard zone for uplink so that non-urgent interferers are inhibited and urgent ones are admitted with a controlled access probability as long as the primary receiver can tolerate. Numerical results show the outage probability of...
Traffic Engineering application to the cross-layer design of Multiple Access Interference (MAI)-affected powerlimited wireless networks, when Quality of Service constraints are also present, leads to deal with nonconvex resource allocation problems. Although several manageable-complexity solutions have been proposed, they are based on specific capacity functions and, generally, fail to provide reliable...
In this paper, we propose the use of network decomposition under an optimal resource allocation framework. We develop a methodology where recursive formulas can be utilized for calculating the desired end-to-end performance bounds (i.e., backlog bound violation probability) of flows traversing tandem, acyclic queueing networks. We use those performance metrics in an optimization framework that allocates...
Energy harvesting is increasingly gaining importance as a means to charge battery powered devices such as sensor nodes. Efficient transmission strategies must be developed taking into account both the availability of energy and data in the node. In this paper, the best data transmission strategy is found by taking into account that the node has a finite battery capacity and that the data and energy...
The IPTV services represents one of the main pillars in the development of Internet multimedia content sources worldwide and is the main driver of growth in Internet data traffic in terms of volume. In the last two years (2009–2010) we can see an explosive growth in the usage of ultra-mobile terminals having various sizes and operating systems: smartphones, tablets, Google Android, Apple iOS, Microsoft...
Current network architectures and solutions are about to reach the limits of sustainable developments. Research with respect to a Future Internet tackles many different aspects of networking. On one hand, with the evolution of virtualization techniques, a machine can be connected to several networks concurrently and on the other hand, the number of existing applications never stops increasing. Therefore,...
In recent years, publish/subscribe (pub/sub) systems have evolved as serious candidates for the implementation of multicast communication. However, to date they have not been properly analysed with respect to the critical dimension of robustness. Indeed, the robustness evaluations found in the literature only cover a subset of the types of failure situations and generally lack a comprehensive architectural...
Wireless body area network (WBAN) is paving the way for the deployment of a variety of medical and non-medical applications. This class of networks has emerged in the recent years and much of the research in the area of body area networks has focused on issues related to ultra low-power processing and communication, lightweight wireless sensor nodes in order to control the human body functions and...
Recently, there has been significant progress in incorporating using the human sense of touch in the virtual world (Haptics) as well as in transmitting this kind of data. Moreover, all types of networks, including the Internet, have been designed to mainly support only the traditional multi-modal media such as voice and video. Therefore, haptic traffic transmission over these networks will have different...
Opportunistic networks enable users to communicate in the absence of network infrastructure. But forwarding messages in such a network incurs costs for nodes in terms of energy and storage. This may lead to nodes being selfish and not forwarding messages for other nodes, resulting in degraded network performance. This paper presents a novel incentive mechanism for opportunistic networks that uses...
Distributed environments hosting specific and dedicated computing resources are serving nowadays more and more scientific and commercial applications. Finding the right resource in distributed environments in term of performance is not an obvious task. This paper is addressing the issue of selecting the right service deployed in a distributed environment for any applications or workflow engines that...
This paper describes the design and implementation of a new cooperative network measurement platform, which can be used for network management tasks such as distributed quality of service (QoS) measurement, cooperative network troubleshooting. The platform is based on a hybrid peer-to-peer (P2P) structure to realize node management and task coordination, in which the P2P communication protocol and...
The free-riding problem is widely accepted to be retarding the deployment and growth of P2P networks. In order to solve this problem, we give a strict definition of the peer's contribution, utility and incentive reputation and model a P2P network with heterogeneous peers as an incomplete information static game. We use incentive reputation to incentivize peers to share their resources and provide...
The paper deals with a study of probabilistic methods to manage the dependability of a networked distributed system, in the presence of inaccuracies and partial knowledge of system models pertaining to failures. A distributed networked system (DIS) that collects raw data from sensors deployed in the field and delivers a composite data to an end-user is faced with two types of uncertainties: at 'information...
In this paper, we propose a P2P-based live streaming system called PcubeCast. Different from conventional P2P systems, PcubeCast utilizes servers to ensure end-user QoS. Thus, the proposed PcubeCast takes advantage of traditional systems: 1) Quality-of-Service(QoS) from client-server systems and 2) scalability and cost reduction from P2P systems. Through the experiments with real-world application...
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