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arXiv 2102.09426cs.NI
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5G中的动态VNF放置、资源分配和业务路由

Dynamic VNF Placement, Resource Allocation and Traffic Routing in 5G

Morteza Golkarifard, Carla Fabiana Chiasserini, Francesco Malandrino, Ali Movaghar

摘要:

5G网络将通过使用软件定义网络和网络功能虚拟化等使能技术,支持各种垂直服务,并具有各种关键性能指标(KPI)。网络运营商的责任是以满足KPI要求的方式将可用资源有效地分配给服务请求,同时考虑有限数量的可用资源及其成本。一个关键的挑战是,请求可能会随着时间的推移而高度变化,需要一个解决方案来解决它们的动态生成和终止。有了这个动机,我们寻求对请求准入、资源激活、VNF放置、资源分配和流量路由做出联合决策。我们通过考虑虚拟机的设置时间等现实方面来做到这一点,目标是最大限度地提高移动网络运营商的利润。为此,首先,我们制定了一个一次性的优化问题,它可以达到最佳的解决方案,为小规模的问题给出了完整的知识,在整个系统寿命的到达和离开时间的请求。然后,我们提出了一个有效和实用的启发式解决方案,只需要这些知识的下一个时间段和工程的实际规模的情况。最后,我们使用真实世界的服务和大规模的网络拓扑来评估这些解决方案的性能。{结果表明,我们的启发式解决方案的性能优于最先进的在线方法,接近最优。

英文摘要:

5G networks are going to support a variety of vertical services, with a diverse set of key performance indicators (KPIs), by using enabling technologies such as software-defined networking and network function virtualization. It is the responsibility of the network operator to efficiently allocate the available resources to the service requests in such a way to honor KPI requirements, while accounting for the limited quantity of available resources and their cost. A critical challenge is that requests may be highly varying over time, requiring a solution that accounts for their dynamic generation and termination. With this motivation, we seek to make joint decisions for request admission, resource activation, VNF placement, resource allocation, and traffic routing. We do so by considering real-world aspects such as the setup times of virtual machines, with the goal of maximizing the mobile network operator profit. To this end, first, we formulate a one-shot optimization problem which can attain the optimum solution for small size problems given the complete knowledge of arrival and departure times of requests over the entire system lifespan. We then propose an efficient and practical heuristic solution that only requires this knowledge for the next time period and works for realistically-sized scenarios. Finally, we evaluate the performance of these solutions using real-world services and large-scale network topologies. {Results demonstrate that our heuristic solution performs better than a state-of-the-art online approach and close to the optimum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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