Date Added: Apr 2011
In wireless sensor network the efficient use of energy leads to enhance the network lifetime. As idle listening, collision, control overhead and over hearing are the main reasons of energy waste. Many typical MAC protocols are designed to conserve energy and enhance network lifetime. In this paper the authors propose a new contention based energy efficient protocol called Extended S-MAC (EX-SMAC) for wireless sensor networks. It is designed with three main features namely Low duty cycle, less number of collisions and minimum overhearing.