Abstract Given the importance of multicast traffic in current optical networks, many effective multicast routing and spectrum assignment (MRSA) algorithms have been proposed to achieve efficient multicast transmission in elastic optical networks (EONs). However, most of these MRSA algorithms were focus on optimizing only the spectrum resources allocated to multicast service requests, but ignored some fragmented spectrum resources remained after spectrum allocation. Although some fragment-aware MRSA algorithms were proposed for EONs to restrain the fragmented spectrum generated in provisioning multicast transmission, they could hardly precisely compute the amount of the fragmented resources while optimizing the allocated resources for the multicast transmission in EONs. This is because that the fragmented and the allocated spectrum resources always have different duration characteristics. In this paper, we propose a time-based composite-consumption-aware (TCCA) MRSA algorithm to optimize both the fragmented and the allocated resources consumed by the multicast transmission in EONs. By additionally taking the holding time of each multicast service request into account, the proposed algorithm can comprehensively optimize both the fragmented and the allocated resource consumption for the multicast transmission in EONs. Since the comprehensive resource consumption, including both the fragmented and the allocated resource consumption, is optimized by the proposed TCCA algorithm, more available resources can be remained for the subsequent multicast requests, which can increase the request blocking performance in EONs. Simulation results verify that the proposed algorithm can reduce the comprehensive resource consumption for the multicast transmission in EONs with low request blocking probability.

中文翻译：

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弹性光网络中多播流量的基于时间的资源消耗感知频谱分配

摘要 鉴于组播流量在当前光网络中的重要性，已经提出了许多有效的组播路由和频谱分配（MRSA）算法来实现弹性光网络（EON）中的高效组播传输。然而，这些MRSA算法大多只专注于优化分配给组播服务请求的频谱资源，而忽略了频谱分配后剩余的一些碎片化频谱资源。虽然针对EONs提出了一些分片感知的MRSA算法来抑制在提供多播传输时产生的碎片化频谱，但它们在优化EONs中为多播传输分配的资源时难以精确计算碎片化资源的数量。这是因为碎片化和分配的频谱资源总是具有不同的持续时间特性。在本文中，我们提出了一种基于时间的复合消费感知 (TCCA) MRSA 算法，以优化 EON 中多播传输所消耗的碎片和分配资源。通过额外考虑每个组播服务请求的保持时间，该算法可以综合优化EON中组播传输的碎片化和分配资源消耗。由于TCCA算法优化了包括分片和分配资源消耗在内的综合资源消耗，可以为后续多播请求保留更多可用资源，从而提高EON中的请求阻塞性能。