Hierarchical routing in layered ring and mesh optical networks

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

2005

Abstract-Waveband switching (WBS) is an importanttechnique to save switching and transmission cost in wavelength -division multiplexed (WDM) optical networks. A cost-efficient WBS scheme would enable network carriers to increase the network throughput (revenue) while achieving significant cost savings. We identify the critical factors that determine the WBS network throughput and switching cost and propose a novel intermediate waveband switching (IT-WBS) algorithm, called the minimizing-weighted-cost (MWC) algorithm. The MWC algorithm defines a cost for each candidate route of a call. By selecting the route with the smallest weighted cost, MWC balances between minimizing the call blocking probability and minimizing the network switching cost. Our simulations show that MWC outperforms other wavelength/waveband switching algorithms and can enhance the network throughput at a reduced cost.

“…Previous studies verified the benefits of adopting the WBS technique [1]- [3]. Some other studies aimed at achieving maximum cost savings with WBS [4]- [7].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel cost-efficient on-line intermediate waveband-switching scheme in WDM mesh networks

Wang

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

2005

“…The waveband switched along a route as a single bundle forms a waveband-route. In this way, a wavebandroute can reduce the number of ports used compared with the corresponding wavelength-routes (lightpaths) as discussed in [1], [2], and [3]. Thus, adopting the waveband switching (WBS) technique can generate more revenue by minimizing the switching and transmission costs in the optical domain of WDM networks.…”

Section: Introductionmentioning

confidence: 99%

“…ETE-WBS only groups wavelengths for calls with the same source-destination pair into a waveband, as shown in [1]- [4]. Thus, a waveband-route for a call is generated from its source node and terminated at its destination node.…”

Section: Introductionmentioning

confidence: 99%

Same-destination-intermediate grouping vs. end-to-end grouping for waveband switching in WDM mesh networks

Wang

IEEE International Conference on Communications, 2005. ICC 2005. 2005

Dynamic Waveband Switching in WDM Mesh Networks Based on a Generic Auxiliary Graph Model

2005

Photon Netw Commun

Waveband switching (WBS) is a promising technique to reduce the switching and transmission costs in the optical domain of a wavelength-division multiplexing (WDM) network. This paper considers the problem of provisioning dynamic traffic using WBS in a WDM mesh network. The network of interest is a homogeneous WBS network, where each node has the functionality of WBS. The problem is called the dynamic WBS problem, which involves searching waveband-routes or wavelength-routes for the dynamically arriving traffic requests. The objective is to minimize the total switching and transmission costs in the optical domain. To solve the dynamic WBS problem, an auxiliary graph model capturing the network state is proposed. Based on the auxiliary graph, two heuristic on-line WBS algorithms with different waveband grouping policies are proposed, namely the wavelength-first WBS algorithm based on the auxiliary graph (WFAUG) and the waveband-first WBS algorithm based on the auxiliary graph (BFAUG). Simulation results indicate that WBS is an attractive technique which reduces the overall switching and transmission costs by up to 30% in the network. The results also show that the WFAUG algorithm outperforms the BFAUG algorithm in terms of port savings and cost savings.