Aiming at the ââ?¬Å?hotspotsââ?¬Â problem in energy heterogeneous wireless sensor networks, a routing algorithm of heterogeneous sensor\nnetwork withmultilevel energies based on uneven clustering is proposed. In this algorithm, the energy heterogeneity of the nodes is\nfully reflected in the mechanism of cluster-headsââ?¬â?¢ election. It optimizes the competition radius of the cluster-heads according to the\nresidual energy of the nodes. This kind of uneven clustering prolongs the lifetime of the cluster-heads with lower residual energies\nor near the sink nodes. In data transmission stage, the hybrid multihop transmission mode is adopted, and the next-hop routing\nelection fully takes account of the factors of residual energies and the distances among the nodes. The simulation results show that\nthe introduction of an uneven clustering mechanism and the optimization of competition radius of the cluster-heads significantly\nprolonged the lifetime of the network and improved the efficiency of data transmission.
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