We propose Tug-of-War (ToW) for data storage and query mechanism in sensor networks. ToW is based on the concept of data-centric storage where events and queries meet on some rendezvous node so that queries for the events can be sent directly to the node without being flooded to the network. However, rather than fixing the rendezvous point, we dynamically replicate the point and float them in between query nodes and event sensor nodes according to the relative frequencies of events and queries. By carefully calculating the optimal setting, we are able to minimize the total communication costs while adapting to the environment.
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