Abstract
Wireless Sensor Networks (WSNs) unlike IP based networks are data centric. The information can be requested based on the attributes such as, whether a node has observed a temperature above a certain threshold, or a luminosity below a certain range and, so on. A request for data is flooded by the WSN gateway as a query across the network and reaches all or certain sections of the nodes. Then the nodes with requisite data respond back. Thus, routing in a WSN is very different from that in a conventional address centric network. Besides the flow of information, elimination of errors, detection of abnormalities in data and minimization of redundancies are few other key aspects of gathering data in a WSN. Several mathematically rich data fusion techniques are employed in conjunction with information flow to minimize the data flow. These fusion techniques additionally help in reasoning about data and extraction of contextual data. The discussion in this chapter is centered on routing and data fusion in sensor network. However, an additional aspect of discussion in this chapter is interoperability with IP networks. Though zigBee IP and 6LoWPAN stack deal with interoperability, the deployment of zigBee without IP support is wide spread and most of the sensor nodes do not implement newer standards. So, interoperability remains a requirement for all legacy deployments.
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