Date Added: Apr 2011
Event aggregation in WSNs is a process of combining several low-level events into a high-level event to eliminate redundant information to be transmitted and thus save energy. Existing works on event aggregation consider either latency constraint or aggregation function, but not both. Moreover, existing works only consider optimal aggregation for single high-level event, but many applications are composed of multiple high-level events. This paper studies the problem of aggregating multiple high-level events in WSNs with different latency constraints and aggregation functions. The authors propose relation matrix to define aggregation function, which describes the similarity among limited number of primitive events rather than the growing number of high-level events.