Enabling Green Wireless Sensor Network Using SD-MAC Protocol

Sensor MAC (S-MAC) is a single-frequency contention-based sensor network protocol defined in this paper. It is built on the notion of the listen/sleep mode cycle. However, unlike the S-MAC, where the duration of the cycle is fixed, Time-out MAC (T-MAC) introduces an adaptive duty cycle in a novel way: by dynamical ending the active part of it. This saves energy by reducing the amount of time nodes spend waiting for possibly incoming messages while yet maintaining a sufficient throughput. The T-MAC protocol's new idea is to eliminate idle listening by sending all messages in variable-length bursts and sleeping in between bursts. This paper discusses the development of a new protocol. Sensor Dynamic MAC (SD-MAC) protocol overcomes negative listening in S-MAC and T-MAC which sets a node to listen and sleep state based on traffic. Where each node will turn off the radio in the sleep period to save energy and will turn the radio back on the next listen period for exchanging packets if there was traffic.