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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.
In recent years, many logical topology designing methods in IP over WDM networks have been researched in which HLDA (Heuristic Logical Topology Design Algorithm) and MLDA (Minimum-Delay Logical Topology Design Algorithm) are considered as basic algorithms using overlay architecture model in IP over WDM networks. HLDA and MLDA set up the lightpath between the pair of nodes based on only its traffic...
In IP over WDM networks, lightpath bypass is an effective method of decreasing the power consumed by IP routers since this technology can multiplex many requests into one high-capacity lightpath and switch these requests as a single entity in all-optical layer. However, the power consumed by individual lightpaths should also be considered in IP over WDM networks. Therefore, the power efficiency has...
Recent studies have shown that the Information and Communication Technology (ICT) industry is responsible for about 2% of the global emission of CO2 and this percentage is expected to increase as the Internet expands in bandwidth and reach. In this paper, we propose the use of renewable energy in IP over WDM networks to minimize CO2 emissions. A Linear Programming (LP) model is proposed to optimize...
Network operators are migrating their networks to IP over WDM architectures. In such multilayer networks, it is necessary to define mechanisms that efficiently use the resources available from both layers in a coordinated manner. Thanks to the development of the control plane (GMPLS), it is feasible to both set up and tear down lightpaths automatically. Thus the WDM layer can now adapt its configuration...
In this paper, we present a novel distributed algorithm to solve the logical topology reconfiguration problem for IP over WDM networks under dynamic traffic. From the optimization model proposed in, we apply the Lagrangian relaxation to eliminate the capacity constraint and form a dual problem whose optimal solution is the lower bound of the original one. The dual problem is then decomposed into subproblems,...
A new alien wavelength architecture used in long-haul IP over WDM networks is compared against traditional transponder-based WDM. Operational impact and network economics are provided, showing minimal network benefit.
Dual homing lightpath service is considered to support survivable IP over WDM networks, where a prescribed fraction of network bandwidth must survive fiber-link faults. Network costs can decrease by as much as 32%.
Traffic grooming continues to be a rich area of research in the context of WDM optical networks. We provide an overview of the optical and electronic grooming techniques available with focus on IP as the client layer. We discuss the various architectural alternatives available: peer, overlay and augmented models. We first provide a survey on the research work in the area of traffic grooming in optical...
The fault restoration technique based on n:m scheme can improve system availability with small cost increases for WDM networks, where it is possible that n faults occur synchronously in a protection domain or a protection entity, but it has rarely been implemented or standardized. In this paper, an analytical model for mean restoration time of restoration mechanism based on n:m scheme is developed...
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