Efficient Design of Elastic and WDM Optical Networks Meeting VNE Demands and Their Service Requirements

Project: Research

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Optical networks with their tremendous bandwidth capacity, energy efficiency and security advantages have been widely used to power the Internet. Their deployment ranges in size from multi-continental networks to intra-datacenter networks. According to a recent Cisco's White paper [1], the current IP traffic volume is about 4.1 Exabytes/day and is expected to increase to 9.3 Exabytes/day by 2021, a volume that can only be carried by optical networks.Significant research efforts have been directed in recent years towards the development of elastic optical networks (EONs) to improve the efficiency of future networks beyond current WDM networks. Meanwhile, there has been a significant increase in the number of heterogeneous network applications with enormous complexity and resilience requirements supported by optical networks. This turns the management of optical networks into a formidable technical challenge. One key approach to address this challenge is through network virtualization whereby a virtual network operates like a real substrate network, hosted by the virtualized optical networks, in order to offer customized end-to-end services. This enables multiple virtual networks to be accommodated by the same (physical) optical network, thus allowing efficient, robust, reliable and cost effective network management and operations.This project will provide novel network resilience design methodologies to achieve cost effective and energy efficient operations while still meeting the service requirements of future optical networks. For the first time, we will develop methodologies and algorithms for optimizing models that incorporate the integration of substrate optical networks, protection, virtual network embedding (VNE), and EONs. This will provide capabilities necessary for efficient and reliable network operations. Given the enormous complexity and system interdependence associated with virtualization, resilience and reliability are especially important. The project will also compare the benefits of VNE in EONs and in WDM networks.The proposed solutions will scale to realistic network sizes. They will combine new rigorous approaches to iterative LP relaxation with column generation algorithms, and will derive provable bounds on the quality of solutions. We will also provide designs that optimize dynamic network operations loaded by virtual network demands. The project will address both legacy and greenfield scenarios. Under legacy scenarios, a topology is given, and the aim is to optimize the traffic routing and wavelength/spectrum assignment of light paths that support VNE service requirements including performance and service protection. In the greenfield scenarios, the topology is also optimized by minimizing cost subject to meeting VNE service requirements.


Project number9042628
Grant typeGRF
Effective start/end date1/07/18 → …