Uniform versus non-uniform band switching in WDM networks
Computer Networks: The International Journal of Computer and Telecommunications Networking - Optical networks
Coupled-layer type waveband path design method corresponding to traffic demand fluctuation
Computer Communications
Waveband switching for dynamic traffic demands in multigranular optical networks
IEEE/ACM Transactions on Networking (TON)
WDM optical interconnects: a balanced design approach
IEEE/ACM Transactions on Networking (TON)
Exact planning of GMPLS-based transport networks with conversion and regeneration capabilities
Proceedings of the 11th communications and networking simulation symposium
Uniform versus non-uniform band switching in WDM networks
Computer Networks: The International Journal of Computer and Telecommunications Networking - Optical networks
Band-segment protection in multi-granular optical networks
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Alternate multihop routing in limited reconfigurable optical networks
INFOCOM'09 Proceedings of the 28th IEEE international conference on Computer Communications Workshops
Non-uniform waveband switching in multi-granular optical networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Optimal waveband switching in optical ring networks
INFOCOM'10 Proceedings of the 29th conference on Information communications
On the benefits of traffic bifurcation in multi-granular optical transport networks
ONDM'10 Proceedings of the 14th conference on Optical network design and modeling
Towards the realistic planning of GMPLS-based optical transport networks
Photonic Network Communications
Performance analysis of an optical network employing waveband and traffic grooming
Photonic Network Communications
Uniform waveband assignment in optical mesh networks
Photonic Network Communications
Cost-effective heuristics for planning GMPLS-based transport networks
Optical Switching and Networking
Optimal Wavebanding in WDM Ring Networks
IEEE/ACM Transactions on Networking (TON)
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Waveband switching (WBS) has attracted attention from the optical networking industry for its practical importance in reducing port count, the associated control complexity, and cost of optical cross-connects (OXCs). However, WBS-related problems of theoretical interest have not been addressed thoroughly by the research community and many issues are still wide open. In particular, WBS is different from wavelength routing and, thus, techniques developed for wavelength-routed networks (including for example, those for traffic grooming) cannot be directly applied to effectively address WBS-related problems. In this paper, we first develop an integer linear programming (ILP) model, which for a given set of lightpath requests, determines the routes and assigns wavelengths to the lightpaths so as to minimize the number of ports needed. Since the optimal WBS problem of minimizing the port count in WBS networks contains an instance of routing and wavelength assignment (RWA), which is NP-complete, we adopt a powerful waveband assignment strategy and develop an efficient heuristic algorithm called balanced path routing with heavy-traffic first waveband assignment (BPHT). Both the ILP and the heuristic algorithm can handle the case with multiple fibers per link. We conduct a comprehensive evaluation of the benefits of WBS through detailed analysis and simulations. For small networks, our results indicate that the performance of the BPHT heuristic is close to that achievable by using the ILP model and, hence verifying its near-optimality. We show that for larger networks, BPHT can perform better than its variation called balanced traffic routing with maximum-hop first waveband assignment and much better than another heuristic based on optimal (but waveband oblivious) RWA that minimizes wavelength resources. We also show that WBS using BPHT is even more beneficial in multifiber networks than in single-fiber networks in terms of reducing the port count. Our analytical and simulation results provide valuable insights into the effect of wavelength band granularity, as well as the tradeoffs between the wavelength-hop and the port count required in WBS networks.