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A Clustering-tree Topology control algorithm based on Energy Forecast (CTEF) introduced for Heterogeneous Wireless Sensor Network (HWSN) to solve the problems of energy consumption and to ensure the network load balancing. In HWSN, forecasting the energy consumption per round in the network lifetime and the actual lifespan of network is difficult than homogeneous wireless sensor network. CTEF algorithm is proposed for solving this problem. A CTEF is proposed for ensuring the network load balancing and saving energy by considering the link quality and packet loss rate. Energy consumption can be predicted more accurately in each round by considering the network lifetime. The difference between the ideal and actual average residual energy can be calculated using central limit theorem and normal distribution mechanism. The best nodes are selected as per the cluster-head cost function including the energy, link quality, packet loss rate and their distance. If the distance among cluster heads is short, more nodes will be judged to join to the cluster, which will consume more energy. Several non-cluster heads in each cluster are chosen as per the relay nodes for transmitting data through multi-hop communication in order to decrease the load of each cluster-head and prolong the lifetime of the network. CTEF has longer network lifetime and receives more data packets at base station.The network lifetime of CTEF is higher than other three algorithm because more nodes deployed to increase the total energy of the network. It also brings a burden to the cluster heads during their communications which will consume more energy. The network throughput is to be increased by increasing energy heterogeneity and parameter value

ENERGY FORECAST FOR HETEROGENEOUS WIRELESS SENSOR NETWORKS USING CLUSTERING TREE TOPOLOGY SCHEME