Comprehensive design methodology for control and d

Authors: Gitanjali Chandwani Rajat Sen Debasish Datta

Publish Date: 2016/06/30

Volume: 33, Issue: 3, Pages: 243-257

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Abstract

We propose a comprehensive design methodology for control and data planes of wavelengthrouted optical networks WRONs employing mixedlinerate MLR transmission for costeffective resource provisioning The proposed approach attempts to minimize the maximum lightpath capacity demand in Gbps representing the measure of lightpath congestion in network for a given traffic matrix by using a mix of a heuristic scheme and linear programming LP In the first step of the proposed threestep design some lightpaths are set up on a set of judiciously selected fiber links with pointtopoint lightpaths between neighboring nodes on a specific wavelength throughout the network and an appropriate fraction of the same set of lightpaths is utilized for carrying control information forming therefore the control plane CP of the WRON The remaining bandwidth of these lightpaths is utilized to carry the data traffic along with all other designed lightpaths of the WRON using appropriate algorithm forming the overall data plane DP of the WRON In the second step traffic routing is carried out through LP to minimize lightpath congestion in the network In the third step we utilize the results of LP to assign rates to lightpaths such that the cost considering only the transceiver cost of the network is minimized This design leads to congestionaware MLR network with due consideration to costeffectiveness without compromising the network restoration response against link failures We carry out simulation studies employing possible CPs using both symmetric CP topology being same as the physical topology as well as asymmetric using fewer fiber links than the symmetric case topology The results of our simulations indicate that the proposed design of CP with symmetric/asymmetric topology and inband transmission with sublightpath capacity can bring down network congestion and cost with respect to symmetric outofband transmission using fully reserved lightpaths for CP without any perceptible sacrifice in respect of the network restoration time Failure can occur either in CP or DP or in both the planes We investigate the effect of design of CP with symmetric/asymmetric topology on network restoration time for single and doublelink failures We further present DP design methodology with hybrid restoration scheme ie combination of dedicated 11 path protection and path restoration We analyze the effect of symmetric CP topology and degree of protection on the congestion of the network Some lightpaths that support more traffic are protected against failures while the others are left for path restoration in the event of failures As more lightpaths are protected the congestion and power consumption of network increase We provide an analysis of the factors that come into play while altering the degree of protection and observe how the choice for the degree of protection in DP can be arrived at using an appropriate design methodology

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