An adaptive energy-efficient MAC protocol for wireless sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Energy-efficient collision-free medium access control for wireless sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
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In this paper, S-MAC(Sensor MAC) is based on the concept of the 'listen/sleep mode cycle' and is single-frequency contention-based protocol for sensor networks. This applies message passing to reduce contention latency for sensor-network applications that require store-and-forward processing as data moves through the network. However, unlike the S-MAC, where the duration of the cycle is fixed, T-MAC(Time-out MAC) introduces an adaptive duty cycle in a novel way: by dynamical ending the active part of it. This reduces the amount of energy wasted on idle listening, in which nodes wait for potentially incoming messages while still maintaining a reasonable throughput. The novel idea of the T-MAC protocol is to reduce idle listening by transmitting all messages in bursts of variable length, and sleeping between bursts. In this paper we discuss the design of these two Protocols. We analyze them from the aspect of power savings using the OMNET++ simulator and real environment with MICA Mote2 kit on MIB510 Sensor board with simulation application, Surge-View.