Micro implementation of join operation at clustering nodes of heterogenous sensor networks
A wireless sensor network is an information technology infrastructure capable of processing theoretically unlimited sequences of data commonly called as data streams. dA heterogeneous sensor network consists of sensing nodes creating the streams of atomic data items and clustering nodes joining several data streams into one stream of complex data items and performing the preliminary data processing. This work investigates the microprogramming implementation of join operation at the clustering nodes. We define a data stream join operation and we prove that it can be computed in an incremental way. Then, we propose a number of optimisation techniques for its processing. The micro implementation of join operation on 8-bit microprocessor controller with memory and interfacing ports is derived from the incremental processing algorithm. We describe architecture of firmware implementation of join operation and we propose a network implementation of a number of join modules. The experimental results include testing of join operation on two and many data streams
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