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This paper proposes a distributed lightpath protection scheme for diverse routing in multi-domain optical networks with correlated and probabilistic failures. This novel solution jointly considers traffic engineering and failure risk reduction objectives.
Traditionally in wavelength division multiplexed (WDM) networks, multicasting is accomplished by splitting the signals all-optically, thereby establishing a tree of lightpaths (light-tree) from the source to every destination. To provision for this functionality in a Multicast-Incapable environment, in which the switches are not capable of directing an incoming signal to more than one output interface,...
We examine the energy consumption of content delivery architectures, with a focus on the benefit of content centric networking (CCN) and dynamic optical bypass. For each case, we build energy models based on the energy consumption of current network equipment and devices. We further analyze the energy tradeoff among key networking resources. By optimizing the placement of content according to its...
The Internet explosion has drastically increased the bandwidth demand of modern telecommunication networks and as optical networks provide an opportunity for the future Internet, it is expected that Internet providers will gradually replace their infrastructures with optical networks. The Internet is a decentralized set of networks (more than 29.000) known as domains or Autonomous Systems on a well-known...
In IP over WDM networks, a single failure in the WDM layer breaks down multiple IP links and may leave the virtual topology disconnected. This will make the restoration by the IP layer impossible, which must be avoided by suitable virtual topology design. In this paper, we focus on single-node failure and develop a Remove-Node Algorithm to map IP links on lightpaths in such a way that the IP topology...
Satellites communication networks by means of optical WDM intersatellite links (ISLs) with wavelength routing is demonstrated. A method has been described for dimensioning their required wavelengths. Using this method, satellite network with the proposal to include WDM ISLs is investigated and discussed to estimate the bounds of its wavelength requirements based on considering the regular Bi-directional...
We propose a novel outer-ROADM-ring (ORR) based multi-domain routing scheme in optical WDM networks. Results show that this scheme has both high scalability and low blocking probability, while preserving inter-domain confidentiality as well.
We propose a dynamic routing and frequency slot assignment algorithm for SLICE networks that employ distance adaptive modulation. We verify that the spectrum utilization penalty that stems from non-uniform bandwidth allocation is marginal.
With the increase of SRLGs, availability of shared-path protection deteriorates significantly. We propose availability-aware SRLG failure protection and heuristics by satisfying availability requirements while minimizing spare capacity usage.
A unified control plane is necessary to be designed for multi-layer optical networks, especially for IP over WDM networks to improve the performance and efficiency of the entire networks. This paper focuses on the framework of PCE-based unified control plane, and proposes some strategies for different optimization objectives.
This paper addresses multi-domain lightpath provisioning within the context of correlated multi-failure events. The work jointly incorporates both risk minimization and traffic engineering objectives, and develops a novel graph theoretic scheme for distributed operation in realistic optical network settings. Detailed performance evaluation results are then presented to gauge the effectiveness of the...
We study the m-trail (monitoring trail) allocation problem in all-optical WDM mesh networks for achieving fast and unambiguous link failure localization. The existing ILP is not feasible for solving the problem in large-size networks. A heuristic RCA+RCS can find feasible solutions in a shorter running time, but it is a randomized algorithm. More importantly, RCA+RCS suffers from the disjoint trail...
Tremendously increasing bandwidth demands on the Internet require high transmission capacity and reliable end-to-end connections which are offered by optical WDM networks. Huge bandwidth demands of the applications cause rising energy consumption at the optical cross-connects which contributes a significant portion of the total electricity consumption. In this paper, we study the availability design...
We discuss the power-aware Logical Topology Design problem in wavelength routing networks, and analyze the economical impacts of power-efficiency. Results show that energy-optimized logical topologies can bring significant economical savings.
In this paper, we address the problem of survivable traffic grooming in optical WDM networks in which lightpaths are hop constrained. Survivability is provisioned at the wavelength granularity through either dedicated or shared path protection schemes. We propose an auxiliary-graph-based algorithm that addresses grooming, protection, and impairment constraints in a combined manner and that determines...
The transport traffic in WDM optical networks are provided to the networks customers in the form of lightpath via virtual topology reconfiguration (VTR), thus the algorithm to perform such an VTR has crucial impact on the resource usage efficiency. This paper proposes the routing algorithm of the Virtual Topology Reconfiguration based on the Genetic Algorithm (VTR-GA) for static traffic in the IP/WDM...
Most works about all-optical circuit-switched WDM networks considers a shortest path algorithm for fixed routing, like the Dijkstra' algorithm. However, recently, two new algorithms, searching for better load balancing and presenting superior performance than Dijkstra's when submitted to an uniform traffic load, were proposed, the Restricted Routing Technique (RRT) and the Best among the Shortest...
This paper studies the impact of node degree distribution to availability and capital and deployment expenditure of optical WDM transport networks. Three structured degree-3 graphs with fair node degree distribution are proposed in this context. Using a realistic network optimization framework based on genetic algorithms, we evaluate the performance of structured topologies and compare it against...
We propose to use an iterative heuristic for the shortest path routing in static RWA problem of optical networks. The heuristic's performance is compared, in terms of number of wavelengths, with the shortest Dijkstra's path algorithm. The results suggest that it is feasible to choose routes, among the shortest paths, minimizing the number of wavelengths. For all studied scenarios, the heuristic achieved...
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