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Understanding the real performance of a proposed algorithm is a basic requirement for both algorithm designers and implementers. However, this is sometimes difficult to achieve. Each new algorithm published is evaluated from different perspectives and based on different assumptions. Without a common ground, it is almost impossible to compare different algorithms directly. Choosing an incompetent algorithm...
Numerous studies based on complex measurement platforms have been carried out for over ten years now in order to discover the Internet topology on domain level. It turns out that this topology exhibits certain invariant properties such as a distribution of node degree. This distribution follows a power law. Moreover, the revealed topology is hierarchical. The hierarchy is caused by commercial contracts...
The design of a Wireless Sensor Network suitable to meet the applications requirements is particularly relevant in environments where it is not possible to operate after the deployment, modifying the network to respect the desired behavior. This paper proposes a model to allow performance evaluation of the network before its deployment, helping its design and the choice of the right value of the network...
In this work, we analyze the design of green routing algorithms and evaluate the achievable energy savings that such mechanisms could allow in several realistic network scenarios. We formulate the problem as a minimum energy routing optimization, which we numerically solve considering a core-network scenario, which can be seen as a worst-case for energy saving performance (as nodes cannot be switched...
Wireless mesh networks (WMNs) have emerged to support applications on various domains, such as military, financial and healthcare, that claim for high level of both security and performance. Since WMNs are susceptible to security issues, and their devices own limitations that can compromise network performance, this paper presents SECOM, a framework for self-configuration of WMNs to provide simultaneously...
Multiprotocol Label Switching (MPLS) is an Internet Engineering Task Force (IETF) specified framework that provides for the efficient designation, routing, forwarding and switching of traffic flows through the network. MPLS is a versatile solution to address the problems faced by present-day networks like speed, scalability, quality-of-service (QoS) management, and traffic engineering. MPLS carries...
This paper evaluates the performance evaluation by combining Network layer and MAC layer protocols with Transport layer congestion control mechanisms operating in a mobile adhoc network. In Adhoc networks, certain QoS parameters like error rate, delay and packet loss are increased and certain parameters like throughput and delivery ratio are decreased in Transport layer is due to MAC problems and...
Quality-of-service aware packet protection is demonstrated using cross-layer signaling from a delay-line-interferometer-assisted optical-signal-to-noise-ratio monitor. 8??10 Gb/s wavelength-striped optical messages are successfully rerouted based on performance monitoring measurements communicated between the physical and networking layers.
The following topics are dealt with: mobile ad-hoc network; sensor network; data management; network management; routing; localization; power awareness; energy efficiency; performance evaluation; QoS; MAC; coding application; network security; network privacy; target tracking; and performance enhancement.
Traditional approaches for testing MANET protocols and applications prior to field experimentation often involve simulation tools or small-sized physical testbeds. However, simulation tools typically do not run in real-time and rely on simplified models rather than a real system, while physical testbeds are prohibitively expensive to build and operate. A more practical method is to use emulation tools...
The following topics are dealt with: performance modelling; performance evaluation; routing mechanisms; broadcast mechanisms; distributed systems; parallel systems; service oriented architecture; trust management; agent computing; video communication technology; communication protocol; automatic network systems; advanced network systems; Internet computing; ad hoc networks; wireless sensor networks;...
Optical packet switching (OPS) technologies are among the most promising solutions for next generation network architectures. Resource contention resolution and Quality of Service (QoS) management mechanisms have been developed in order to remedy the lack of optical buffering and implement multi-service support in OPS networks. In this paper we propose an analytical model for the access and core nodes...
Localized Quality of Service (QoS) routing is a viable alternative to the QoS routing algorithms that use global network state information to make routing decisions. In localized QoS routing algorithms each source maintains a predetermined set of candidate paths for each destination and avoids the problems associated with the maintenance of global network state by using locally collected flow statistics...
Network operators have understood the importance of migrating their backbone networks to IP over WDM architectures, whereby an underlying optical infrastructure can automatically set up and tear down direct optical connections (lightpaths), yet keeping electronic IP routers on top of it. In such multi-layer networks, it is necessary to efficiently combine the resources available in both electronic...
WiBro (Mobile WiMAX) is a broadband wireless internet service supporting for fixed, portable and mobile users, but enhancement of service quality in indoor environment is still necessary. WiBro femtocell is developed to expand cell coverage, increase system capacity and offer various multimedia service with high throughput in indoor environment. Three types of femtocell are designed according to the...
This paper discusses and evaluates the behaviour o fa DS-TE algorithm (DiffSev aware MPLS traffic Engineering) called PEMS, and a dynamic multipath routing algorithm for load balancing (LBWDP), applied on a huge topology that correspond to real network. To clarify network topologies and routing algorithms that are suitable for MPLS traffic engineering, we evaluate them from the viewpoint of network...
Packet classification enables network routers to provide advanced network services including network security, quality of service (QoS) routing, and multimedia communications. In order to classify a packet, network nodes must perform a search over a set of filters using multiple fields of the packet as the search key. Viewing the classification problem geometrically, classifying an arriving packet...
In this research, the performance evaluation of two class priority Delta Multistage Interconnection Networks (MINs) is analyzed, using a discrete priority queuing model. All Delta Networks are constructed by special switching elements (SEs) based on an architecture which natively supports two classes of routing traffic. The proposed analytical method which was developed for performance metrics investigation...
Grid networks have captured a lot of attention in recent years because of their potential to generate new applications thanks to network, computing and storage resources virtualization. Quality of service (QoS) is a key issue for grid services provisioning. Current grid services are provided on multi service networks such as the Internet. Thus, QoS architectures originally developed for the Internet...
The goal of this paper is to present a system able to support the network delivery of live events in an expected, future Digital Cinema scenario. This service can consume a large amount of network bandwidth, due to the large volume of transmitted data and to the number of receivers, thus multicast transmission proves to be very useful. Consequently, a key issue of the system is the request routing...
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