Analysis And Simulation On Cluster-Based Routing Protocols For Wireless Sensor Networks

Routing technology at the network layer is vital to the lifecycle of wireless sensor network during the configuration of wireless sensor networks. As an active branch of routing technology, cluster-based routing protocols have many advantages, such as network topology management, energy minimization, data aggregation and so on. In this thesis, the author analyzed cluster-based routing mechanisms for wireless sensor networks at first. Secondly, the author emphasized Cluster head selection, cluster formation and data transmission in cluster-based routing protocols. From these techniques perspective systemically, recent representative cluster-based routing protocols are presented,and compared with their characteristics and application areas.And then a transmission protocol based on unequal clustering size for wireless sensor networks is presented. Wireless sensor networks can be organized by clusters , which are enable to the efficient utilization of the limited energy resources of the deployed sensor nodes. LEACH is a kind of typical protocol. But the former research usually adopts random strategy on cluster formation after cluster head selection, and then build a routing tree among cluster heads, so the cluster heads near the base consume more energy than other cluster heads, because its need to transfer data for cluster heads far away from the base. According to this characteristic, the author presented UCP, a distributed energy efficient protocol via unequal clustering size in this paper. We will allocate more node in cluster head far away from the base than cluster head near the base while cluster formation. Thus, the cluster heads far away from the base consume more energy than cluster heads near the base; however, the cluster heads near the base not only gather the data but also transfer the data to other cluster heads far away from the base, so the energy dissipation of every cluster head nodes will be balanced. The total energy dissipation will more less. Simulation results show that UCP's performance is far better than LEACH's performance by 13% -16%.At last, a transmission protocol based on cover set for wireless sensor networks is presented. Generally speaking,Wireless Sensor Network is commonly possessed with these characterstics,such as highly denseand and the node limitation of energy resource. In order to reduce energy consumption and to prolong the life of wireless sensor network ,the node density controlalgorithm and node state mechanism are adopted. the core idea is that it is shut down the node in the cluster which is redundant enable to save energy and prolong the lifecycle of wireless sensor network , under guaranteeing the coverage fraction ratio.on the other hand ,in order to guaranteeing the eletion of cluster head efficient,the Self -adaptive Clustering Algorithm are adopted.Simulation results show that CSP's performance is far better than LEACH's performance by 36%.