Nguyen Thi-Thuy-Lien, Pham Tuan-Minh
University of Engineering and Technology, Vietnam National University, Hanoi 100000, Vietnam.
Faculty of Information Technology, Hanoi National University of Education, Hanoi 100000, Vietnam.
Sensors (Basel). 2020 Jun 4;20(11):3198. doi: 10.3390/s20113198.
The Internet of Things (IoT) is increasingly creating new market possibilities in several industries' sectors such as smart homes, smart manufacturing, and smart cities, to link the digital and physical worlds. A key challenge in an IoT system is to ensure network performance and cost-efficiency when a plethora of data is generated and proliferated. The adoption of Network Function Virtualization (NFV) technologies within an IoT environment enables a new approach of providing services in a more agile and cost-efficient way. We address the problem of traffic engineering with multiple paths for an NFV enabled IoT system (vIoT), taking into account the fluctuation of traffic volume in various time periods. We first formulate the problem as a mixed linear integer programming model for finding the optimal solution of link-weight configuration and traffic engineering. We then develop heuristic algorithms for a vIoT system with a large number of devices. Our solution enables a controller to adjust a link weight system and update a flow table at an NFV switch for directing IoT traffic through a service function chain in a vIoT system. The evaluation results under both synthetic and real-world datasets of network traffic and topologies show that our approach to traffic engineering with multiple paths remarkably improves several performance metrics for a vIoT system.
物联网（IoT）正在为智能家居、智能制造和智慧城市等多个行业领域创造越来越多的新市场可能性，以连接数字世界和物理世界。物联网系统中的一个关键挑战是，当大量数据产生并激增时，要确保网络性能和成本效益。在物联网环境中采用网络功能虚拟化（NFV）技术，能够以一种更灵活且具成本效益的方式提供服务。我们针对启用了NFV的物联网系统（vIoT），考虑不同时间段内流量的波动，解决多路径流量工程问题。我们首先将该问题表述为一个混合线性整数规划模型，以找到链路权重配置和流量工程的最优解。然后，我们为具有大量设备的vIoT系统开发启发式算法。我们的解决方案使控制器能够调整链路权重系统，并在NFV交换机上更新流表，以便在vIoT系统中通过服务功能链引导物联网流量。在网络流量和拓扑结构的合成数据集及真实世界数据集下的评估结果表明，我们的多路径流量工程方法显著改善了vIoT系统的多个性能指标。
