Research On Congestion Detection And Intelligent Adjustment Of Wireless Sensor Network

In recent years, with the rapid development of system on chip and networking technology, wireless sensor network as one of its key technology obtained the rapid development, therefore, in the 2.4GHz ISM band gathered a lot of short distance wireless communication technology and gained popularity in the real life, make the coexistence and interference between different wireless technology communication problems become very serious, especially the interference of ZigBee and Wi-Fi, Bluetooth, microwave and wireless communication technology, ZigBee technology is a kind of short distance, low power consumption, low rate wireless communication technology. It consists of a large number of sensor nodes through the self-organizing way constitute a wireless sensor network, is a kind of non-infrastructure network, the communication bandwidth is limited, and in a cluster, multi-hop mode of wireless communication, when it coexists with other wireless communication technology, especially in the Wi-Fi interference, ZigBee wireless sensor network is disturbed by the larger part, serious when can make the whole ZigBee wireless sensor network paralysis.In order to solve the ZigBee and other protocols coexist, the congestion of ZigBee wireless sensor networks in the intelligent detection and adjustment are studied deeply, the first interference characteristics of ZigBee wireless sensor network itself are studied, such as energy detection, packet loss rate, link quality index, received signal strength index. Then the ZigBee wireless sensor network in Wi-Fi interference were studied under the coexistence problem, proposes a communication channel to switch between ZigBee wireless sensor network interference prediction based on the way. Because in the past a period of time, the use of wireless communication technology all the time, has certain regularity, so this paper through the degree of interference on ZigBee each channel statistics within a period of time, other wireless communication technology, and through the historical data of each channel congestion degree forecast, select a communication channel a group of optimal scheme for ZigBee wireless sensor network to adjust, this way can effectively alleviate the problem of coexistence and interference of ZigBee wireless sensor networks and other wireless communication technology, to improve the communication efficiency of ZigBee wireless sensor network, ZigBee wireless sensor network in have laid a solid foundation for application of the coexistence problem.