Hint-Based Routing in WSNs Using Scope Decay Bloom Filters

In existing query-based routing protocols in Wireless Sensor Networks (WSNs), a node either keeps precise route information to desired events, such as in event flooding, or does not keep any route to desired events such as in query flooding. This paper proposes a routing protocol, called Hint-based Routing by Scope Decay Bloom Filter (HR-SDBF) that employs probabilistic hints. In HR-SDBF, each node maintains some probabilistic hints about events and utilizes these hints to route queries intelligently. The authors also put forward a data structure, Scope Decay Bloom Filter (SDBF) to encode the probabilistic hints.