Improving capacity and reducing delay are the most challenging topics in wireless ad hoc networks. Nodes that equip multiple radios working on different channels simultaneously permit ef-fective utility of frequency spectrum and can also reduce interference. In this paper, after analyzing several current protocols in Multi-Radio Multi-Channel (MR-MC) ad hoc networks, a new multi-channel routing metric called Integrative Route Metric (IRM) is designed. It takes channel load, inter-flow, and intra-flow interference into consideration. In addition, an MR-MC routing protocol based on Interference-Aware and Channel-Load (MR-IACL) is also presented. The MR-IACL can assign channels and routings for nodes according to channel load and interference degree of links, and optimize channel distribution dynamically to satisfy the features of topology changing and traffic frequent fluctuation during network running. The simulation results show that the new protocol outperforms others in terms of network throughput, end-to-end delay, routing overhead, and network lifetime.
在物联网的概念提出之前,射频识别(radio frequency identification,RFID)和无线传感器网络(wireless sensor network,WSN)均沿着各自的技术路线发展,它们之间的兼容性问题尚未被考虑。而在物联网中,这两种技术需不断地进行融合,研究它们在物联网中的工作机制和协作方式将具有十分重要的意义。通过对相关应用中RFID与WSN协作机制进行深入分析,将RFID与WSN在物联网下的协作分为四种融合方式,并对这四种融合方式的设计原理与工作过程进行了分析与探讨,最后指出了RFID与WSN协同工作机制目前需要解决的关键问题。
