Abstract
Wireless sensors are battery-limited sensing and computing devices. How to prolong the lifetime of wireless sensors becomes an important issue. In order to reduce the energy consumptions when nodes are in idle listening, duty-cycle-based MAC protocols are introduced to let node go into sleep mode periodically or aperiodically. The long duty cycle makes sensors increase the transmission throughput but consumes more energy. The short duty cycle makes sensors have low energy consumption rate but increases the transmission delay. In this paper, a dynamic traffic-aware MAC protocol for energy conserving in wireless sensor networks is proposed. The proposed MAC protocol can provide better data transmission rate when sensors are with high traffic loading. On the other hand, the proposed MAC protocol can save energy when sensors are with low traffic loading. Simulation results show that the proposed protocol has better data throughput than other duty-cycle-based MAC protocols, for example, S-MAC and U-MAC. We also developed a set of comprehensive experiments based on the well-known OMNET++ simulator and revealed that our proposed TA-MAC performs significantly outstanding than related schemes under various situations.
Highlights
A wireless sensor network (WSN) is composed of hundreds or thousands of autonomous and compact sensing devices, gathering and delivering information about events of interest to observers
In order to reduce the energy consumptions when nodes are in idle listening, duty-cycle-based MAC protocols are introduced to let node go into sleep mode periodically or aperiodically
A dynamic traffic-aware MAC protocol for energy conserving in wireless sensor networks is proposed
Summary
A wireless sensor network (WSN) is composed of hundreds or thousands of autonomous and compact sensing devices, gathering and delivering information about events of interest to observers. If the uniform duty cycle is set too long, it may cause energy wastage on nodes with low data traffic because the nodes are in idle listening. U-MAC protocol tunes duty cycle according to the traffic loads of sensor nodes. In wireless sensor networks, making nodes asleep for a long time to lower the energy consumption may result in higher transmission latency [11]. We propose a dynamic traffic-aware duty cycle adjustment MAC protocol named “TA-MAC” which can adjust sensor’s duty cycle adaptively according to status of sending/receiving buffer, traffic loading, and battery life. The goals of the proposed MAC protocol are twofold: (i) to conserve energy on sensors with low traffic loading and (ii) to decrease transmission latency and increase data throughput on sensors with heavy traffic loading.
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