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Computing approximate blocking probabilities for transparent waveband switching based WDM networks using hierarchical cross-connects |
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| Affiliation: | 1. Lebanese University, Faculty of Science I, LPE Research Center, Beirut, Lebanon;2. ENIB/CNRS UMR 6285 Lab-STICC, Brest, France;3. CRITC Research Center, Arts Sciences and Technology University in Lebanon (AUL), Lebanon;1. Electrical Engineering Department, Khaje Nasir Toosi University, Tehran, Iran;2. Electrical Engineering Department, Shahid Beheshti University, Tehran, Iran;3. School of New Technologies, Iran University of Science and Tech., Tehran, Iran;4. Electrical and Electronics Engineering Department, University of Qom, Qom, Iran;1. EHF Key Lab of Science, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China;2. Center of Communication and Tracking Telemetering Command, Chongqing University, Chongqing 400044, China;3. Sichuan Jiuzhou Electric Group co., Ltd., Mianyang, Sichuan 621000, China |
| Abstract: | An analytical model is presented to study the dynamics of wavelength division multiplexing (WDM) networks with waveband switching (WBS). The reduced load approximation method is considered to compute approximated network blocking probabilities in WBS-based WDM networks. The analytical model considers the link blocking probability due to insufficient link capacity and an impact of the waveband granularity (G). The analytical model also considers the node blocking probability due to unavailability of a switch port at the wavelength cross connect (WXC) layer of an Hierarchical cross connect (HXC) switch node. The set of nonlinear equations is obtained with the link independence assumption and solved using repeated substitutions. The accuracy of the analytical model is examined by comparing with simulation results considering the random-fit algorithm for waveband and wavelength assignments in different network scenarios. Lightpaths are routed between source and destination (s-d) HXC switch nodes using shortest path first (SPF) routing. An impact of the switch parameter to limit the input and the output WXC switch ports of an HXC switching node is also being investigated using the analytical model as well as through simulation results. |
| Keywords: | Hierarchical cross-connect Analytical model Dynamic traffic Waveband switching Wavelength division multiplexing Blocking probability analysis Reduced load approximation |
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