Research On Channel Switching Technology For Wireless Sensor Networks Under Contiki System

In recent years,the application scale of wireless sensor networks has been expanded,resulting in lower frequency utilization and decline in quality of wireless networks communication.These highlighted issues make it difficult to meet the needs of users of high-performance sensor networks.In order to solve the above problems,it is necessary to study further the frequency management mode of the wireless networks.According to the features of the wireless sensor networks,the channel switching technology is optimized to improve the communication quality of networks.Finally,the implementation of a lightweight and stable channel switching technology has certain practical significance for the application and development of wireless sensor networks.First of all,this article reviews the channel switching technology of wireless sensor networks.Then,the MAC layer of IEEE 802.15.4 protocol stack has been optimized and the hardware platform has been built.The optimized protocol is ported into the Contiki operating system.The channel switching technology is studied on the hardware platform after that.Finally,simulation software is used to simulate the real networks.On this basis,the performance and practicability of channel switching technology are evaluated.The main research work is as follows:1.This article demonstrates the research content of channel switching technology in wireless sensor networks.Based on the technical characteristics of the wireless sensor networks,a comprehensive analysis of the existing frequency management technology identify which mode is applicable to channel switching technology.The advantages of wireless sensor networks using channel switching technology are highlighted,which proves that it can be used to solve the problem of channel quality degradation.And studies further the related technical supports such as the network topology,which is necessary to realize the channel switching technology.2.Optimizing the MAC layer protocol of channel switching,moreover,a hardware platform is built.Combined with the characteristics of communication protocol stack and working principle,the MAC layer protocol is optimized in the real network and the channel switching technology is realized.The hardware platform is built on the existing project,including the circuit design of the terminal node,the design and performance test of the RF module.Finally,the protocol of channel switching is ported to the hardware platform,which means that a complete channel switching technology is achieved in the system.And the construction of the hardware platform provides arealistic basis for theoretical research.3.Opnet network simulation software simulates channel switching technology and performs performance testing.According to the hardware condition and protocol stack optimization,the network model is established.The channel switching technology is implemented in the simulation environment,and the performance of the network system is analyzed.Firstly,establish a simple network structure,and then increase the network topology complexity and network size gradually.The impact of these factors on the performance of channel switching technology is studied in depth.Through the analysis of the simulation results,it proves the superiority and practicability of the channel switching technology,and guarantees certain success rate under the premise of solving the degradation of the channel quality.At the same time,this paper provides guidance on the performance and application scenarios of wireless sensor networks that can use channel switching technology.