Definition and configuration of reliable event detection for heterogeneous WSN

This work introduces an intuitive XML-based Event Specification Language (ESL) that simplifies event configuration to a level that is even suitable for non-professionals. It features hardware independent description elements to define complex phenomena and improves these by tailor-made voting schemes and application constraints. Based on that, a novel fully decentralised mechanism to autonomously set up distributed event detection called Event Decision Tree (EDT) and a cost efficient means to maintain such EDT, is presented. EDT can be efficiently constructed on every device by using a tiny generating finite state machine requiring eight states only. It enables every node to self divide event queries according to its own resources and self-adapt to the tasks assigned. Simultaneously, the EDT provides the interface for efficient collaboration using a lease-based publish/subscribe approach, which outperforms even idealised ACK-based approaches.