Enhanced Sensor Medium Access Control (ESMAC) Protocol for Wireless Sensor Network

Abstract

Wireless sensor networks have been attracting significant research and commercial interest recently. Since data dissemination is different from traditional ad-hock networks new challenge arises. The challenges are due to resource constraint nature of wireless sensor networks. Wise use of wireless sensor nodes resources such as energy, storage and communication capacity will increase performance of wireless sensor network. The most effective way of saving sensor node energy in wireless sensor networks is through sleep wakeup scheduling. Existing Medium access control layer contention based scheduling technique such as 802.11 IEEE has short coming for wireless sensor networks. Contention based protocol with features such as idle listening and overhearing waste sensor nodes energy. This thesis discusses best feature of existing Medium access control protocols for wireless sensor networks. We develop network size and remaining energy of sensor nodes based Medium access control protocol for saving sensor node energy while minimizing communication delay between sensor nodes. Enhancement is made to SMAC (Sensor Medium access control) protocol by introducing network size as a configurable parameter to adjust contention window instead of fixed contention window of SMAC (Sensor Medium access control). To reduce energy consumption of SMAC (Sensor Medium access control) the duty-cycle adjustment based on remaining energy of nodes is proposed. Performance of SMAC (Sensor Medium access control) and ESMAC (Enhanced Sensor Medium access control) is evaluated on Network simulator-2. The combined effect of those two parameters enables as to enhance the performance of SMAC (Sensor Medium access control) in power efficiency, delay and throughput.