Research On Clustering, Multi-channel Dynamic Allocation And Channel Occupancy Methods In Wireless Sensor Network

Wireless sensor networks(WSN)is a distributed and self-organizing wireless communication sensor network.It has flexible network settings,equipment location can be changed at any time,and can be connected with the Internet in wired or wireless ways.It has been widely used in industrial monitoring,national defense,military,environmental monitoring,medical and health care,intelligent transportation and other fields.Aiming at the problems of existing wireless sensor network clustering methods that do not consider node residual energy,low energy consumption efficiency,short network life cycle,resulting in premature node death,insufficient utilization of channel resources,large transmission delay and low throughput,this paper carries out the research on wireless sensor network clustering,multi-channel dynamic allocation and channel occupation methods.The main research contents are as follows:1.The clustering method of wireless sensor networks is studied,and a clustering method of wireless sensor networks based on node residual energy and location(relchp)is proposed.This method first uses LEACH protocol for clustering,and then clusters after stable stage;In the re clustering,the node residual energy and position threshold model are established.The cluster head is selected according to the model.After the cluster head node is selected,it informs the whole network through broadcasting.Other nodes in the network decide the dependent cluster according to the signal strength of the received information,and notify the corresponding cluster head node.After the clustering is completed,it is re clustered according to the model after the stable stage.Through the simulation experiment on OPNET simulation platform,the results show that compared with leach and leach-f clustering methods,the energy consumption efficiency of this clustering method is 19.4% higher than leach method and 8.3% higher than leach-f method;The network life cycle is 28.6%higher than leach method and 9.5% higher than leach-f method.2.The multi-channel dynamic allocation and channel occupation methods of wireless sensor networks are studied,and a multi-channel dynamic allocation and channel occupation method based on CSMA / CA is proposed.The communication channel between cluster heads is divided into multiple subchannels through frequency division multiplexing technology,and the packet loss rate of each subchannel is dynamically detected in the process of communication between cluster heads,Select the subchannel with the lowest packet loss rate as the communication channel between cluster heads;When cluster heads are assigned to the same subchannel at the same time,the backoff algorithm of CSMA / CA is improved to ensure that the communication between cluster heads occupies the channel fairly.Through the simulation experiment on OPNET simulation platform,the results show that compared with the method based on CSMA / CA and CT-MAC protocol,the delay of this method is significantly less than that of CSMA / CA and CT-MAC methods,and the volatility is the smallest and the most stable;The throughput is 20.9% higher than CSMA / CA and 41.4% higher than CT-MAC;The channel competition fairness index is 4.3 higher than CSMA / CA methods and 1.2 higher than CT-MAC methods,and the overall stability is the best.