Abstract
This paper investigates the quality-of-service (QoS)-driven multicast routing problem in a sparse-splitting optical network. The main objective is to minimize the total cost of wavelength channels utilized by the light-tree while satisfying required QoS parameters. In this paper, both the optical-layer constraints (e.g., optical signal power) and application-layer requirements (e.g., end-to-end delay and inter-destination delay variation) are considered as the QoS parameters. First, integer linear programming (ILP) formulations to solve the optimal multicast routing problem with the given QoS parameters are presented. Solving the ILP formulations for large-scale networks can easily overwhelm the capabilities of state-of-the-art computing facilities, and hence, a heuristic algorithm is proposed to construct a feasible light-tree that satisfies the required QoS parameters in large-scale networks. Simulation results demonstrate the performance of the proposed heuristic algorithm in terms of the cost of utilized wavelength channels.
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Notes
If all the nodes are multicast capable, the network is said to be full splitting.
In this paper, the cost is defined as the number of wavelength channel. It is important to minimize the number of utilized wavelength channel for a multicast session since the number of wavelength channel carried by each fiber is limited. Therefore, in this paper, we focus on constructing light-tree that minimizes the number of utilized wavelength channels required.
It is the difference between the end-to-end delays among the paths from the source to any two destinations.
In this paper, it is assumed that the processing and O/E/O conversion delay is negligible, and propagation delay is the dominate factor of end-to-end delay.
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A2A01014687). We also would like to appreciate the helpful discussion with Wanjun Huang and Prof. Andrea Fumagalli who are with Open Networking Advanced Research Laboratory, Erik Jonsson School of Engineering and Computer Science, the University of Texas at Dallas, Richardson, TX 75080, USA.
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Park, JW., Kim, J. QoS-driven multicast routing in sparse-splitting optical networks. Photon Netw Commun 25, 178–188 (2013). https://doi.org/10.1007/s11107-013-0401-7
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DOI: https://doi.org/10.1007/s11107-013-0401-7