Research And Implementation Of Clustering Routing System In Wireless Sensor Network

With rapid development of wireless communication technology,low-power consumption of sensor nodes,deployment of wireless sensor network(WSN)technology has been greatly advanced.As there is no need to construct fixed communication infrastructures,WSN has been widely used in many applications,such as industrial automation,military,environment monitoring and so on.Although sensor nodes are able to sense information and conduct wireless communication in a self-organized way,battery powered sensor nodes are limited by small storage,processing ability.Sensor nodes are often randomly deployed in the field and it is difficult to replenish energy for them.Hence traditional Ad-Hoc network routing technology is not directly applicable to wireless sensor networks.For resource-constrained WSN,an important research problem is how to establish a suitable routing path to transmit information sensed by nodes in order to prolong life cycle of WSN as much as possible.For routing of wireless sensor networks,clustering technology has the advantage of being energy-efficient,scalable.So it is in favor of coordinated distributed network management,even energy consumption of nodes to improve energy efficiency as well as prolong network life cycle.This thesis will focus on research of energy-efficient WSN clustering routing technology and consider designing WSN routing protocols under the unreliable wireless communication in a reasonable way.Main work of this thesis are listed as follows:(1)LEACH protocol has the problem that nodes close to base station are prone to deplete energy when selecting cluster heads.This thesis puts forward a WSN clustering algorithm based on threshold value partition.The presented algorithm design a hybrid hierarchical routing algorithm to divide the deployment area into two parts based on the specified threshold value:inner area and outer area.Compared with outer area,our protocol uses a larger parameter to generate cluster head among inner area.Finally we compare performance of the put forward protocol with that of LEACH protocol by simulation experiment.Results show that the put forward protocol can effectively prolong life cycle of WSN when considering the round that the first node exits.(2)Taking into account that packet loss events on wireless links,data loss will reduce precision of data aggregation and retransmission will incur more energy consumption.To reduce data loss rate within life cycle of WSN,this thesis puts forward an adaptive cluster head election protocol based on reliability of wireless links.When a node selects cluster head nodes among neighbor candidates,it will consider factors such as link reliability and energy of nodes in order to adaptively select the best cluster head node.To measure the neighbors' link reliability,we introduce ACK and sliding window to record communication status of the latest rounds with neighbor nodes.Simulation results show that when compared with LEACH protocol,our protocol can effectively reduce data loss rate to realize effective and reliable data transmission,improve the efficiency of data transmission of wireless sensor network by dynamic selecting neighbor cluster head nodes.