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Congestion Avoidance Energy Efficient MAC Protocol

Congestion Avoidance Energy Efficient MAC Protocol

Alex Sundling’s Thesis Defense

July 30, 2012
10:00am – 12:30pm
MEC 301

Advisor:

Dr. Sirisha Medidi

Committee:

Dr. Murali Medidi

Dr. Amit Jain

ABSTRACT:

Wireless Sensor Network (WSNs) are generally energy-constrained and resource-constrained. When multiple simultaneous events occur in densely deployed WSNs, nodes near the base station can become congested decreasing the network performance. Additionally, multiple nodes may sense an event leading to spatially-correlated contention further increasing congestion. In order to mitigate the effects of congestion near the base station, an energy-efficient MAC protocol that can handle multiple simultaneous events and spatially-correlated contention. Energy efficiency is important and can be achieved using duty cycles but they could degrade the network performance in terms of latency. Existing protocols either provide support for congestion near the base station or for managing spatially-correlated contention is needed. To provide energy-efficiency while maintaining the network’s performance under higher traffic load, we propose an energy-efficient congestion-aware MAC protocol. This protocol provides support for congestion near the base station and spatially correlated contention by employing a traffic shaping approach to manage the arrival times of packets to the layers close to the base station. We implemented our protocol using the NS2 simulator for evaluating its performance. Results show that our protocol has an improvement in the number of packets received at the base station while consuming less energy.

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