The use of wireless sensor networks for gathering environmental and safety-critical data in real time is increasing at a rapid rate. Some of the main criteria in designing sensor network architectures are energy-efficiency, self-management and self-healing. However, most protocols for data gathering and routing in sensor networks implicitly assume a regular rate of data gathering by individual nodes. While this is sufficient for sensing parameters that change slowly over time, individual nodes in a small part of a network may need to increase the rate of data gathering considerably for reporting important data in real-time. Though CSMA protocols can report increasing amount of data in theory, increased contention for the wireless medium in a small part of the network usually results in increased message collision and retransmission. In this paper, we present a novel TDMA protocol for transferring time slots from one part of the network to another part to support non-uniform and reactive sensing in different parts of a network. We discuss the design of this protocol and show that it performs much better compared to CSMA protocols both in terms of energy-efficiency and supporting nonuniform sensing.
[1]
Rachel Cardell-Oliver,et al.
FlexiMAC: A flexible TDMA-based MAC protocol for fault-tolerant and energy-efficient wireless sensor networks
,
2006,
2006 14th IEEE International Conference on Networks.
[2]
Deborah Estrin,et al.
A wireless sensor network For structural monitoring
,
2004,
SenSys '04.
[3]
Nitin H. Vaidya,et al.
A MAC protocol to reduce sensor network energy consumption using a wakeup radio
,
2005,
IEEE Transactions on Mobile Computing.
[4]
Katia Obraczka,et al.
Energy-efficient collision-free medium access control for wireless sensor networks
,
2003,
SenSys '03.
[5]
Richard Zurawski,et al.
Embedded Systems Handbook
,
2004
.
[6]
Ian F. Akyildiz,et al.
Wireless sensor networks: a survey
,
2002,
Comput. Networks.