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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1,  Number 1,  May 2009

Issue on Computer Science

Page(s): 299-306

An Adaptive Energy Efficient MACProtocol: S-MAC, Its Performance Analysis and improvements

           Venkatesh, SH Manjula, Smitha Shekar B.

Full text:  PDF


In wireless sensor networks and ad hoc networks, energy uses are in many cases the most important constraint since it corresponds directly to operational lifetime. It’s due to their remoteness; it makes inability to resupply power to these energy-constrained devices. Therefore to extend a wireless sensor network’s effectiveness, the lifetime of the network must be increased by making them as energy efficient as possible. An energy-efficient medium access control (MAC) and routing protocol can maximize the whole network lifetime. This paper focuses on a protocol stack solution that deals with MAC layer and Network layer, which minimizes the energy consumption and delay required to transmit packets across the network.

Our work is based on Adaptive S-MAC protocol designed for sensor networks. We first illustrate the main drawback of the adaptive S-MAC, and then a solution, proposed solution enables low duty cycle operation, common sleep schedules to reduce control overhead, low latency and traffic adaptive wakeup. To reduce control overhead and latency, it introduces coordinated sleeping among neighboring nodes. It is a contention based protocol based on CSMA/CA mechanism. This protocol is simulated in NS-2 and performance evaluated using various topologies under various traffic conditions. In addition to this, we use information from the MAC-layer to select few nodes concerned with actual data transmission.

Index Terms

Wireless sensor networks, energy -efficient MAC protocol, Energy conservation, traffic adaptive wakeup, latency

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