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Abstract
Wireless Sensor Networks(WSNs) contain nodes which generally will never be attended after they are deployed into either hostile or remote areas. These nodes are supposed to work with their limited as well as non-rechargeable resources (i.e., Batteries). Once the battery has been discharged, it is very difficult to recharge or replace the battery. Hence, that node is considered dead. This makes energy efficiency one of the most important design objectives for the sensor networks. These sensor nodes stay asleep for a long period and are supposed to become active as soon as something is detected. This characteristic and/or application motivates for a MAC that is not the same as the traditional wireless MAC such as IEEE 802.11