ReliableDataGathering in Tree-Based
Daniele Messina · 2006
Thispaperdescribes a routing protocol foren- hancedrobustness inIEEE 802.15.4-based sensornetworks, whichalsoaddresses typical MAC layer issues, including power management, synchronization andlinkreliability. Thealgorithm usesasingle-path strategy inerror-free scenarios andresorts to using alternative paths whencommunication errors aredetected. Ourproposal exploits implicit acknowledgement ofreception, a feature whichmay beprovided bydataaggregation when a broadcast mediumsuchasthewireless channel isused. Therefore MAC layer acknowledgements arenotusedanderrors recovery relies ona caching andretransmission strategy. The protocol requires synchronization amongthenodes, whichalso allows theimplementation ofpowersaving techniques suchas sleep/listen schedules. Theperformance oftheproposed approach isevaluated through simulations, inwhichwestudytheoverall network reliability andquantify theenergyrequirements, with different network sizes andprotocol parameters.