Service Oriented Architecture has gained significant attention as programming model for heterogeneous wireless sensor networks. Its key idea is to exploit the decoupling of service providers and consumers to enable platform independent applications that are dynamically bound to platform specific services. The promise of service oriented architecture is to enable the composition of new distributed applications/solutions: when no available service can satisfy a client request, available services can be composed in order to satisfy such a request. In this paper we explore a simple approach for service composition in service oriented wireless sensor networks. Service composition solution includes algorithms for service graph generation, service selection, service merging and routing. An evaluation of the proposed system was conducted. That included a comparison with related works. The obtained simulation results show that the proposed system achieves significant improvements on aspects including query success ratio, latency, energy consumption and quality of service.

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