Time, clocks, and the ordering of events in a distributed system
Communications of the ACM
Operating System Concepts
Distributed Systems: Concepts and Design
Distributed Systems: Concepts and Design
Computer architecture: a quantitative approach
Computer architecture: a quantitative approach
PSFQ: a reliable transport protocol for wireless sensor networks
WSNA '02 Proceedings of the 1st ACM international workshop on Wireless sensor networks and applications
Energy-efficient broadcast and multicast trees in wireless networks
Mobile Networks and Applications
Energy-efficient broadcast and multicast trees in wireless networks
Mobile Networks and Applications
Time Synchronization for Wireless Sensor Networks
IPDPS '01 Proceedings of the 15th International Parallel & Distributed Processing Symposium
ESRT: event-to-sink reliable transport in wireless sensor networks
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
Connected sensor cover: self-organization of sensor networks for efficient query execution
Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing
ICDCS '01 Proceedings of the The 21st International Conference on Distributed Computing Systems
A scalable approach for reliable downstream data delivery in wireless sensor networks
Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Fine-grained network time synchronization using reference broadcasts
OSDI '02 Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading
IEEE Communications Magazine
CEDAR: a core-extraction distributed ad hoc routing algorithm
IEEE Journal on Selected Areas in Communications
Communication and Coordination in Wireless Sensor and Actor Networks
IEEE Transactions on Mobile Computing
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A typical wireless sensor network performs only one action: sensing the environment. Our requirement for intelligent interaction with the environment has led to the emergence of Wireless Sensor and Actor Networks (WSANs), where a group of sensors, actors, and a central coordination entity (sink) linked by wireless medium perform distributed sensing and acting tasks. In order to provide tight coupling between sensing and acting, an effective coordination mechanism is required among sensors and actors. In this context, we identify the problem of ''hazards'', which is the out-of-order execution of queries and commands due to a lack of coordination between sensors and actors. We identify four types of hazards and show with an example application, the undesirable consequences of these hazards. We also identify and enumerate the associated challenges in addressing hazards. In this context, we discuss the basic design needed to address this problem efficiently. We propose a distributed and fully localized hazard-free approach that addresses the problem and the associated challenges based on the design. Through analytical studies and simulations we study the performance of the proposed solution and two basic strategies, and show that the proposed solution is efficient for a variety of network conditions.