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BitTorrent is currently the most popular peer-to-peer network for file sharing. However, experience has shown that BitTorrent is often used to distribute copyright protected movie and music files illegally. Consequently, copyright enforcement agencies currently monitor BitTorrent swarms to identify users participating in the illegal distribution of copyright-protected files. These investigations rely...
In order to plan the network construction reasonable and ensure the quality of network service, it is important to measure the Link-bandwidth utilization and get the flow information. One of the methods to monitor network efficiently is based on flow-conservation, and the problem of searching a solution for this method could be deduced to solving weak vertex cover problem, which has been proved NP-hard...
Traffic anomaly detection is one of the most important technologies that should be considered in network security and administration. In this paper, we propose a traffic anomaly detection mechanism that includes traffic monitoring and traffic analysis. We develop an analytical system called WISE-Mon that inspects the traffic behavior by monitoring and analyzing the traffic. We establish a criterion...
With today's widespread deployment of wireless technologies, it is often the case that a single communication device can select from a variety of access networks. At the same time, there is an ongoing trend towards integration of multiple network interfaces into end-hosts, such as cell phones with HSDPA, Bluetooth and WLAN. By using multiple Internet connections concurrently, network applications...
The increasing popularity of P2P and multimedia applications around the world has resulted in significant global increases in network traffic. This paper investigates the traffic changes in our enterprise network by analyzing the day-long traffic traces from 2007 to 2009. We observe that there has been a substantial increase in traffic in the past few years; however, no single application type is...
Since their emergence peer-to-peer (P2P) applications have been generating a considerable fraction of the overall transferred bandwidth in broadband networks. Residential broadband service has been moving from one geared towards technology enthusiasts and early adopters to a commodity for a large fraction of households. Thus, the question whether P2P is still the dominant application in terms of bandwidth...
There is growing evidence that a new generation of potentially high-revenue applications are emerging that can benefit from widespread multicast support in large IP networks. These applications, such as streaming video and interactive games, have inherent quality of service (QoS) requirements. Current methods of QoS provisioning have either scalability concerns or cannot guarantee end-to-end delay...
This paper presents an adaptive real-time video streaming (AVS) system that delivers real-time video stream from a network camera to multiple video receivers. The system provides an application layer rate-adaptation mechanism that adapts video quality and bit rate according to the network congestion conditions and the available bandwidth. The goal of the system is to improve the smoothness of the...
Quality of service requirements for IP networks are becoming higher. Accordingly, managing, measuring, and monitoring IP networks are also becoming more important. In particular, for real-time communication, the quality of packet transmission (packet loss, delay, and delay variation) needs to be carefully maintained. In managing these performance parameters, active measurements have been often used,...
Today more and more video is transmitted over IP network and mainly peer-to-peer network. But peer-to-peer solutions can not transmit high quality and high resolution video stream as HDTV. For this we have to create reliable architecture and solve different problems. Our main idea is using manager server in the top of the tree construction for smartly providing alternative parent peers for a case...
This paper investigates the stability characteristics of overlay networks performing switching between multiple virtual paths. A global stability condition for switched-control-systems has been applied to overlay path switching frequency, that can be incorporated into design of better routing protocols for overlay networks. Further, NS-2 based simulations have been carried out on an overlay network...
Network measurements always play a vital role for good network management purposes and are essential for quality of service (QoS) requirements. Packet delay derivations are critical measurement parameters in diagnosing simple network performance measures. The traditional ping tool is popular for target host connectivity testing and average delay measurements. However, ping is a poor indicator of round...
In this paper we introduce XLayer, a cross-layer communications substrate for tactical Information Management Systems which enable nodes on a radio network to seamlessly communicate with nodes on different heterogeneous networks. While conventional cross-layer strategies for tactical environments tend to focus on the localized optimization between neighbor layers of the communications stack, our approach...
Ship dynamic and video monitoring system at sea aims at improving safety of ship sailing and providing help for salvage. In this system, wireless communication technology of CDMA1X is used to transfer GPS dynamic positioning information and ship video. As to the special communications at sea, the actual bandwidth of single channel CDMA1X is too low to transfer video. In order to cope with this problem,...
End to end available bandwidth is often constrained by IEEE 802.11 hops in the access network. Available bandwidth measurement is particularly challenging in the wireless environment because of adaptive data rates, a time varying channel, and CSMA/CA based contention instead of simple FIFO queueing. We present a novel estimation scheme for IEEE 802.11 networks in infrastructure mode, based on passive...
A new network transmission framework highlighting the concept of cross-layer co-design for packet loss reduction is presented in this article. The proposed framework takes into account the correlation between the packet loss rate and the packet size under a given channel condition, and assigns different tasks to layers involved: physical/ MAC layer for monitoring current channel statuses, IP layer...
In this paper we investigate the dynamics of one-way delays in an operational mobile core network. Our final goal is to develop anomaly detection schemes for the packet delay process in order to reveal network and equipment problems. This requires a preliminary exploration of the delay distribution in the core network, which we undertake in this study. We present one-way delay measurements extracted...
Due to the advanced and unique features of multi-homing and multi-streaming, Stream Control Transmission Protocol is suitable for data communications over satellite network, however, the satellite network are characterized by long-propagation delays, large-bandwidth product, and corruption losses. Thus, these protocols (TCP, UDP, SCTP) doesnpsilat work better over the satellite link. In this paper,...
Packet losses are a critical metric for network performance assessment. In this paper we present a novel methodology to accurately estimate the packet loss ratio in realtime in a fully distributed scenario. The constraint such systems must face is the large amount of resources required for keeping live performance assessment. Our contribution has two main parts. On the one hand we study the behaviour...
The increasing diffusion of home area networks (HANs), intended for the delivery of multimedia contents (e.g. TV programs, movies, music) as well as home automation data (e.g. household appliances, lighting and surveillance controls), represents a new challenge for networking. However, at present, most of the available domotic and building automation solutions provide single answers to the market...
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