Date Added: Jan 2013
Due to their ease of deployment, reliability, scalability, flexibility, and self-organization, the existing and potential applications of Wireless Sensor Networks (WSN's) span a wide spectrum in various domains, the environmental and technical requirements of which may differ significantly. The major bottle neck in WSN based data collection is the limited power back up. Due to some hostile environments periodic charging of wireless nodes is also not possible. The purpose of deploying a WSN is to collect relevant data for processing and reporting. In particular, based on data reporting, WSNs can be classified as time-driven, event-driven and data driven. In this paper, a hybrid data-gathering protocol that dynamically switches between the event-driven data-reporting and data-driven data-reporting schemes is proposed.