International Journal of Computer Networks and Applications

N’takpe N’guessan Christian ¹, Adepo Joel Christian ², Babri Michel ³

Affiliations
1 Computer and Telecommunications Research Laboratory, National Institut Félix Houphouët Boigny, Yamoussoukro, CI
2 Digital Research and Development Unit, Virtual University of Ivory Coast, Abidjan, CI
3 National Institut Félix Houphouët Boigny, Yamoussoukro, CI

Abstract

Reconfiguration is one of the most important capabilities of optical networks. This task is performed by operators to re-optimize network resource utilization. Multicast applications such as videoconference online learning, etc., emerge rapidly and cause an increase in bandwidth demand. A multicast connection in an optical network is provided by a light-tree. Due to physical link failures, light-trees are protected by backup paths. Thus, our study focuses on the reconfiguration of a protected light-tree. The reconfiguration problem studied here is to migrate rapidly an optical flow from an old light-tree to a new light-tree without service disruption. To solve this problem, we propose a mechanism based on dependencies graphs. This method establishes simultaneously groups of the final light-tree branches by using shared backup paths spectrum resources. The numerical results show that our approach avoids flow interruptions and reduce significantly the number of steps required to achieve the reconfiguration process more than existing methods.

Keywords

Optical Network, Reconfiguration, Multicast, Protection, Survivable, Light-Tree.

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KIE Eba Victoire ¹, ANOH Nogbou Georges ², ADEPO Joel Christian ³, BABRI Michel ¹

Affiliations
1 Computer and Telecommunications Research Laboratory, National Institute Felix Houphouet Boigny, Yamoussoukro, Ivory Coast, CI
2 Research and Digital Expertise Unit, Virtual University of Cote d’Ivoire, Abidjan, Cote d’Ivoire, CI
3 Research and Digital Expertise Unit, Virtual University of Cote d’Ivoire, Abidjan, Cote d’Ivoire., CI

Abstract

At the national level, Telecommunications systems are generally organized into several interconnected autonomous domains. When transmitting data between interconnected domains, the blocking probability of network can be high due to the complexity of management and management policies at the domain level. Therefore, the question it raises is how to optimize inter-domain routing between different autonomous systems? The optimization of the inter-domain routing can be realized from several criteria related to the interconnection links, namely: the fragmentation rate, the energy consumed, the link quality, the transmission delay, the blocking probability, and the service quality. In this work, we propose an interdomain routing algorithm for multi-domain elastic optical networks, and a model for managing fragmentation in the network to optimize resources utilization. The implementation of inter-domain routing requires the construction of sub-topologies from existing domain topologies and parameters such as fragmentation rate, link quality, energy consumption contrary to blocking probability which used in literature. These different contributions (CA-IL, CIL-TFM and CIL-CEM) based on parameters have allowed to optimize the use of the network resources, to reduce the consumed energy as well as the blocking probability of the network compared to existing model in the literature through the simulations that have been conducted. However, the CIL-TFM approach provides a better blocking probability than other approaches with less resources used, and more energy consumed. In the future, we intend to integrate an end-to-end delay management model to achieve optimal inter-domain routing with the parameters already used.

Keywords

Multidomain, Elastic Optical Network, Inter-Domain Routing, Fragmentation, Energy Consumption, Sub-Topology, Inter-Link.

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