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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...
Core networks are increasingly supporting overlay networks on top of an IP-WDM network. As network reliability is a growing concern, a major challenge in the survivable layered network design is the crosslayer survivable mapping problem that deals with QoS parameters such as availability, lightpath length, and many others. This work directly studies this problem and proposes matrix formulations of...
With services provided by mobile operators enriching and demands on quality of service increasing, to provide better services and make full use of the underlying network has become an urgent task. To solve these problems, the overlay network is proposed, it can make a virtual network on the basis of different physical networks. In this paper we make a discussion on the QoS framework of IMS overlay...
Wireless sensor networks (WSNs) often operate in severe surroundings and may suffer simultaneous failure of multiple nodes which gets the network partitioned into distinct segments. Restoring connectivity among these segments is crucial in order to prevent the negative effects on the application. This paper investigates effective approaches for recovering from the failure for scenarios where the distance...
The interest for providing services with performance guarantees across different connected networks has given new technical solutions allowing the computation of constrained inter-domain paths. Thus, the present paper treats the problem of computing inter-domain paths subject to multiple constraints. We study here existing algorithms for inter-domain computations, and describe new approach approximating...
The present paper proposes a novel method for computing inter-domain paths subject to multiple independent additive constraints in MPLS-TE networks. An efficient solution to this problem is a key element for providing services with guaranteed performance across domain boundaries. However, the inherent hardness of the multi-constrained path computation as well as inter-domain scalability and security...
According to several studies, the power consumption of the Internet accounts for up to 10% of the worldwide energy consumption, and several initiatives are being put into place to reduce the power consumption of the ICT sector in general. To this goal, we propose a novel approach to switch off network nodes and links while still guaranteeing full connectivity and maximum link utilization. After showing...
The fulfilment of guaranteed multiple criteria based quality of service (QoS) for multimedia applications servicing multiple subscribers is known to be a NP complete problem. Moreover, finding the multicast graph respecting the defined QoS requirements and minimizing network resources is also a NP-complete optimization task. The well-known greedy algorithm Mamcra, proposed in the literature, computes...
Topology aggregation in hierarchical networks has been recognized as an effective way for the purpose of reducing the storage of state information. However, it also introduces deviation from original information. To find the optimal tradeoff between information reduction and accuracy for topology aggregation, two novel approximation approaches based on the conception of approximation staircase was...
Most network operators have considered reducing Label Switched Routers (LSR) label spaces (i.e. the number of labels that can be used) as a means of simplifying management of underlaying Virtual Private Networks (VPNs) and, hence, reducing operational expenditure (OPEX). This letter discusses the problem of reducing the label spaces in Multiprotocol Label Switched (MPLS) networks using label merging...
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