23 / 2016-06-30 11:14:42

Media Access Control in Wireless Sensor Networks using Priority IndexMAC, message length, energy efficiency

MAC, message length, energy efficiency,message urgency

As the nodes in Wireless Sensor Networks (WSNs) have limited power resource, energy conservation
is essential at different layers of the protocol stack to prolong the lifetime of WSNs. For instance, at Medium Access Control (MAC) layer, the sensor can turn off its radio when there is nothing to communicate. In our previous work, Priority based Slot Allocation for media access in Wireless Sensor Networks (PSAWSN), the probability based priority scheme is used to allocate slots to competing nodes.
Limitations of this work include 1) It does not handle dynamic and variable slot allocation based on the varying requirements of nodes. 2) Error control and flow control are not taken into account. To overcome some of these limitations, we propose MAC Scheme in WSN using Priority Index (MACPI) that generates Priority Index (PI) to allocate varying slots based on parameters: message length, node
energy, number of requests and message urgency. Models have been designed for all these parameters and an expert system is proposed that makes decisions based on collective knowledge about these parameters. Simulation study and result analysis for energy efficiency, throughput and dynamic slot allocation show an improved performance compared to PSAWSN for various message sizes and error conditions.