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In this paper, we use machine learning technique at the routers to study the link state protocol data to predict the existence of shared risk link groups (SRLG) in the network. In particular, we use the correlation between different link state updates (LSUs) issued by different network nodes (routers) upon failure. The concerned network router then runs a novel Bayesian network based statistical learning...
In this paper, a prediction tool for wireless reception quality at 2.4 GHz that avoids the problems of both methods mentioned above is presented and validated. Path loss measurements have been executed in an office building in Ghent, Belgium and a dominant path loss model which is the basis of the prediction tool, is constructed based on the results. To avoid that the application of the model is restricted...
Nowadays, wireless access networks are a large contributor to the CO2 emissions of ICT. Today, ICT is responsible for 4 % of the annual energy consumption and this number is expected to grow drastically in the coming years. The power consumption of these wireless access networks will thus become an important issue in the coming years. In this paper, the power consumption of wireless base stations...
Wireless sensor networks (WSNs) have a variety of purposes. They are mainly used for monitoring environmental factors, like CO2 concentrations, temperature and humidity. Other applications of sensor networks focus on detecting traffic parameters, e.g. passenger flows, damaged roads and traffic lights. This paper extends the current research with an economic feasibility of a real case, deploying a...
High-bandwidth QoS sensitive services such as large scale video surveillance generally depend on provisioned capacity delivered by circuit-switched technology such as SONET/SDH. Yet development in layer 2 protocol sets and manageability extensions to Ethernet standards propose layer 2 packet switching technology as a viable, cheaper alternative to SONET/SDH. Layer 2 switched networks traditionally...
The large share of energy consumption in telecommunication networks is expected to shift from access networks to core networks. Estimating the power consumption of core networks is not easy, as they vary a lot in size and topology. Using an exemplary but realistic core network, we estimate its power consumption for both a link-by-link grooming and an optical end-to-end grooming scenario. We show that...
Power consumption of ICT equipment has a growing impact, both on economic and environmental level. To reduce its energy footprint, drastic actions will be required on four fronts: energy-efficient components, power management techniques, new network paradigms and policy supporting actions. This paper outlines the current trends and research for each category.
In this paper we propose a new architecture and a novel media access protocol based on IEEE 802.11 for the home network. We use radio over fiber technology for our architecture where data multiplexing is considered in both wireless and wavelength domain. Our solution enhances the wireless bandwidth usage capability and can provide dynamic bandwidth allocation among users according to the user demands...
DSL aggregation networks are evolving to the standard platform for the delivery of multimedia services such as television and network based personal video recording. These multimedia services introduce large challenges for network operators as they are sensitive to packet loss. Therefore, admission control mechanisms are required to avoid congestion caused by allowing too many sessions. However, as...
Wireless sensor networks consist of several hundredths of simple sensing devices, equipped with a radio. They are typically used for monitoring and automation purposes of large areas. Due to their simplicity, these networks quickly run out of energy, and often have problems regarding scalability and available bandwidth. To solve these issues, current research is mostly limited to the addition of extra...
Ethernet is transforming from a LAN network solution into a technology which can be used within a carrier network. Ethernet is currently especially envisaged within the metro part of the network as a cost efficient replacement of ATM/FR and SDH. This step requires additional functionality built into the Ethernet technology in order to maintain operability and reliability of the network. Considering...
The update process in an IP router after a failure is detected, is a complex process involving more than just recalculating shortest paths. When statistics related to forwarded traffic are not taken into account, which is generally the case, we show that packet loss can be significantly higher than is strictly needed. In this paper we present a combined control and traffic-driven routing table update...
Resource discovery is an important aspect of many modern large-scale distributed systems. In the past, this problem has been solved using many different approaches, such as a central registry server, flooding-based protocols, and distributed hash tables. In this paper, these three widely used architectures are compared, using measurement results obtained from real implementations run on an Emulab...
Today's trend is to create and share personal content, such as music files, digital photos and digital movies. The result is an explosive growth of a user's personal content archive. Managing such an often distributed collection becomes a complex and time consuming task, which indicates the need for a personal content management system that provides storage space transparently, is quality-aware, and...
Carrier networks are gradually adopting a network model that consists of MPLS capable routers and OXCs interconnected by high bandwidth WDM links for transporting IP and Ethernet traffic. Globalization drives the quest for end-to-end QoS guarantees over different carrier networks. Recovery mechanisms are crucial to reach the high availability requirements of critical services. In this paper we investigate...
This paper presents a model for assessing the impact of introducing nationwide road charging systems on supporting mobile data networks. It defines a model based on real traffic measurements, and establishes appropriate parameter values for capturing specific application characteristics such as the importance of data compression, truck-only versus all traffic charging, and dimensioning margins for...
The scalable video coding extension of the H.264/MPEG-4 AVC standard allows encoding a video sequence once and streaming it over heterogeneous networks to a variety of end devices. Different scalability techniques can be employed in order to deliver the most appropriate video bitstream based on network and device characteristics. However, users' Quality of Experience should be maximized at all time...
Massively online virtual environments (MOVEs) have been gaining popularity for several years. Today, these complex networked applications are serving thousands of clients simultaneously. However, these MOVEs are typically hosted on specialized server clusters and rely on internal knowledge of the services to optimize the load balancing. This makes running MOVEs an expensive undertaking as it cannot...
Transparent networks promise a cost efficient solution for future core and metro networks, due to the high efficiency for switching trunk traffic. Network availability is an important performance parameter for network operators, who are incorporating protection and restoration mechanisms in the network to achieve competitive advantages. This talk will focus on the CAPEX reductions expected from implementing...
Automatically switched multilayer IP-over-optical networks offer extensive flexibility in coping with offered traffic. Multilayer traffic engineering (MLTE) takes advantage of this through online IP logical topology reconfiguration in addition to the more traditional rerouting. Although MLTE typically optimizes towards resource usage, bandwidth throughput and QoS performance, energy efficiency has...
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