Network Virtualization for Smart Grid Communications
Network Virtualization for Smart Grid Communications
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DOI：
10.1109/jsyst.2013.2260695
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发表时间：
2014-06
影响因子：
4.4
通讯作者：
Pin Lv;Xudong Wang;Yang Yang-Yang;Ming Xu
中科院分区：
文献类型：
--
作者：
Pin Lv;Xudong Wang;Yang Yang-Yang;Ming Xu
信息交换是智能电网系统控制和管理的关键。光纤广泛应用于输电网和变电站，以提供高容量和高可靠性的通信。然而，由于成本高和可扩展性，光纤不适合用于配电网中的信息传输。无线网状网（WMN）和电力线通信（PLC）网络更适合于配电网通信。尽管如此，WMN和PLC技术都倾向于遭受由于干扰和衰减而导致的比特错误和分组丢失。在这两种情况下都很难提供低延迟和高可靠性的实时服务。网络虚拟化（NV）是一种很有前途的技术，用于支持各种服务的定制端到端性能。在本文中，提出了一种基于NV的智能电网通信框架。在该框架中，实时服务由同时映射到两个物理网络的虚拟网络（VN）支持，即，WMN和PLC网络。用于NV的WMN被设计为采用正交频分多址作为多址方案。以这种方式，不同的VN被分配不同的子载波。多个子载波中的并发传输带来额外分集的益处。通过两个网络和分配的子载波的增强的传输分集有助于实时服务的可靠性保证。由于VN映射和子载波分配问题是非确定性多项式时间困难的，一个启发式的解决方案被开发，以解决问题的效率和有效的。仿真结果表明，我们提出的框架的有效性。
Information exchange is critical in smart grid for system control and management. Optical fibers are widely used in transmission grid and substations to provide high-capacity and high-reliability communications. However, due to high cost and inflexibility, optical fibers are not suitable for information transmission in distribution grid. Wireless mesh network (WMN) and power line communication (PLC) network are more appropriate for distribution grid communications. Nonetheless, both WMN and PLC technologies tend to suffer from bit error and packet loss due to interference and attenuation. It is extremely difficult to provide real-time services with low delay and high reliability in both of them. Network virtualization (NV) is a promising technology to support customized end-to-end performance of various services. In this paper, an NV-based framework is proposed for smart grid communications. In the framework, real-time services are supported by virtual networks (VNs) that are mapped to two physical networks simultaneously, i.e., WMN and PLC network. The WMN for NV is designed to adopt orthogonal frequency division multiple access as the multiple access scheme. In this way, different VNs are allocated distinct subcarriers. Concurrent transmissions in multiple subcarriers bring the benefit of additional diversity. The enhanced transmission diversity through the two networks and the allocated subcarriers contributes to the reliability guarantee of the real-time services. Since the VN mapping and subcarrier assignment problem is nondeterministic polynomial-time hard, a heuristic solution is developed to solve the problem efficiently and effectively. Simulation results reveal the effectiveness of our proposed framework.