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Optical routing technologies will surely be the key to creating future bandwidth abundant and green networks. Considering future services and the need to create virtual fiber networks, the introduction of wavebands is a next important step.
Network coding has been proven with the capability to improve the network bandwidth efficiency for multicast communications. Streaming based IPTV services provided by network operators match the paradigm of using network coding. However, the major research works in the literature focus on the selection of network codes under given routing paths. Few research work jointly considers routing and network...
Tor (The Onion Router) is a popular anonymity overlay network that seeks to provide anonymity without significant cost to performance. Tor's support for anonymity is indeed strong, but its network performance is a problem, and one that is widely recognized. While there are some studies that investigate changing the structure of the Tor network to improve performance, we focus on investigating different...
This paper addresses the Multi-Layer (ML)/Multi-Region (MR) optimal path computation problem in Generalized Multiprotocol Label Switching (GMPLS) networks. Within the context of traffic engineering, path computation consists of routing Label Switched Paths (LSPs) under a multitude of constraints while optimizing resource utilization. One such problem consists of finding a shortest path in a heterogeneous...
QoS Routing Algorithm is a routing algorithm for finding the shortest path that satisfies the QoS requirements of the end users. While finding the shortest path this uses some of improved ideas for effectively finding the shortest path with required QoS measures. Exactly the QoS routing algorithm is a kind of multi constrained routing algorithm where more than one link components are taken into considerations...
In order to design the congestion control scheme in the routers, an Active Queue Management (AQM) is proposed. This is used to control congestion at the router, where packets are dropped before queue becomes full. A new framework of AQM, namely NEWQUE with Per-flow Scheduling (PerNEWQUE) active queue management algorithm supporting explicit congestion notification (ECN), is proposed by extending scheduling...
Ever increasing demand for more bandwidth over the Internet has lead to the development of many new technologies and architectures. Among these, Hybrid of Wireless and Optical networks have become increasingly important because of their “mobility” and “flexibility” in the wireless part and “robustness” and “high capacity”...
The number of elderly in industrialized countries is increasing, and the home healthcare applications are widespread. The routing of healthcare traffic is important with no doubt. This study investigates the problem of unfairness when QoS routing does not consider the mix of traffic classes. Unfairness is mainly caused by routing different traffic flows of the same class through paths with extremely...
Wireless Mesh Networks (WMNs) have emerged as an important technology in building next generation fixed wireless broadband networks that provide low cost Internet access for fixed and mobile users. An orthogonal evolution in computer networking has been the rise of Peer-to-Peer (P2P) applications such as P2P file sharing. It is of interest to enable effective P2P file sharing in this type of networks...
A lot of attention has been devoted to flow routing in networks by the past. Usually, each commodity to be routed is characterized by a single deterministic traffic value. However, telecommunication traffic is well known to be highly variable in time. The current paper revisits usual network routing models, in considering traffic stochasticity, with the aim of better modeling traffic multiplexing...
Fiber-wireless (FiWi) access mesh networks have been proposed as flexible and cost-effective solutions for future access networks. However, for FiWi access mesh networks to provide end-to-end QoS guarantees to its customers, efficient QoS routing schemes and scheduling policies become necessary. Here we provide a model, using repeated game theory, that creates ground for scheduling policies to be...
In this paper, we consider migration of virtual machines in a data center to minimize network power consumption. Network power is consumed when switches are turned on, and conserved when they are turned off; the optimization problem then is to site virtual machines within the data center to achieve connectivity and desired bandwidth while turning on as few switches as possible. Depending upon specifics...
Advance reservation of connection requests is a growing focus area and a range of solutions have been proposed. However, most efforts here have focused on scheduling algorithm design and have not addressed related implementation concerns in distributed settings. As a result, most schemes imply the use of a centralized controller, posing many scalability and reliability challenges. In order to address...
Most of today's high capacity switches and Internet routers do not provide performance guarantees. This is attributed to their underlaying interconnection topology (i.e. the crossbar) and/or to their impractically complex scheduling algorithms. This paper derives a study for a Partially Buffered Crossbar (PBC) switch to practically provide throughput and fairness guarantees. We show how a PBC switch...
Traditional multicast routing algorithms such as shortest path tree (SPT) and minimum Steiner tree (MST) do not consider the wireless broadcast advantage or the underlying channel assignments in a multi-channel multi-radio (MCMR) wireless mesh network (WMN). We propose a multicast routing algorithm for MCMR WMNs that takes into account the above factors in order to minimize the amount of network bandwidth...
We propose a dynamic RWA method for optical path networks that pre-computes route candidates to attain better load-balancing. Numerical experiments elucidate that the proposed method can accommodate 1.3-1.8 times more traffic than the conventional method that ignores load-balancing.
Cost function is an essential part in Application Layer Multicast (ALM) routing algorithms. It is from a cost function that we can calculate links' costs and then build the data delivery tree for multicasting. Unfortunately, cost function remains an almost untouched research area in ALM routing. In this research, we propose a new multi-variable cost function considering various end-to-end QoS parameters...
This paper proposes an intelligent rate controller for the Internet traffic. Called the IntelRate (Intelligent Rate), it is a router-based controller and uses the fuzzy logic control approach to adjust the source sending rate based on the instantaneous queue size of the router. Unlike other explicit congestion control protocols, the IntelRate controller need not evaluate the link states (such as bottleneck...
In multihop wireless networks, end-to-end throughput is often hard to predict and is even harder to optimize due to the effect of interference. To date there is no precise result other than asymptotic bounds for this question: if there is no routing information given, what is the maximum throughput of a network using uncoordinated transmission such as IEEE 802.11 MAC? This paper attempts to address...
Multimedia applications present new challenges to the current networking technology. One of them is Quality of Service (QoS) requirement. Due to the increasing dynamics of traffic introduced by multimedia applications, dynamic and flexible QoS (Quality of Service) control is needed to ensure both QoS satisfaction and resource efficiency. Because integrated service networks are designed to support...
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