Abstract
A pairwise key establishment strategy based clusters for hierarchical wireless heterogeneous sensor networks (HWHSNs) is presented in this paper through investigating how heterogeneous sensor nodes enhance network performance. The HWHSNs have some sensor nodes that have greater power and transmission capability than other nodes. All kinds of nodes are evenly deployed in sensing cube respectively. The three-dimension sensing cube is divided into a number of small same cubes for all kinds of nodes and then eight of those small cubes comprise a logical group for heterogeneous nodes. The structure of HWHSNs is a two-layer structure. The upper layer contains all cluster heads, namely heterogeneous sensor nodes, and the lower layer contains all ordinary sensors managed by corresponding cluster heads. The pairwise keys between all kinds of nodes are set up through utilizing the concept of the overlap key sharing and the random key predistribution scheme. Analysis shows the heterogeneous nodes improve both the security and connectivity of the wireless sensor networks and prolong the WSNs lifetime.
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