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arXiv 2108.09176cs.NI
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支持SDN的5G星地网络中的控制器放置

Controller Placement in SDN-enabled 5G Satellite-Terrestrial Networks

Nariman Torkzaban, John S. Baras

摘要:

支持SDN的综合卫星-地面网络(ISTN)可以提供包括全球无缝覆盖、高可靠性、低延迟等在内的若干优点,并且可以成为下一代网络的关键推动者。为了应对集成网络的控制和管理的复杂性,利用软件定义网络(SDN)的概念将是有帮助的。在这方面,SDN使能的ISTN中的SDN控制器放置问题变得至关重要。在本文中,我们制定了一个优化问题的SDN控制器的位置,目标是最小化的平均故障概率的SDN控制路径,以确保SDN交换机接收的指令在最可靠的方式。同时,我们的目标是将SDN控制器部署在靠近卫星网关的地方,以确保两层之间的连接具有最低的延迟。我们首先将问题建模为混合整数线性规划(MILP)。为了降低MILP模型的时间复杂度,我们使用子模块优化技术,以时间有效的方式产生接近最优的解决方案。最后,我们通过仿真验证了我们的方法的有效性,表明近似方法的结果在一个合理的最优性差距方面的确切MILP解决方案。

英文摘要:

SDN-enabled Integrated satellite-terrestrial networks (ISTNs), can provide several advantages including global seamless coverage, high reliability, low latency, etc. and can be a key enabler towards next generation networks. To deal with the complexity of the control and management of the integrated network, leveraging the concept of software-defined networking (SDN) will be helpful. In this regard, the SDN controller placement problem in SDN-enabled ISTNs becomes of paramount importance. In this paper, we formulate an optimization problem for the SDN controller placement with the objective of minimizing the average failure probability of SDN control paths to ensure the SDN switches receive the instructions in the most reliable fashion. Simultaneously, we aim at deploying the SDN controllers close to the satellite gateways to ensure the connection between the two layers occurs with the lowest latency. We first model the problem as a mixed integer linear program (MILP). To reduce the time complexity of the MILP model, we use submodular optimization techniques to generate near-optimal solutions in a time-efficient manner. Finally, we verify the effectiveness of our approach by means of simulation, showing that the approximation method results in a reasonable optimality gap with respect to the exact MILP solution.

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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