An Efficient Energy Conserving Scheme for IEEE 802.11 ADHOC Networks

Battery power is one of the major and limited resources in wireless communication. In the distributed coordination function (DCF) of IEEE 802.11 power saving mechanism (PSM), energy consumption can be reduced by turning off the radio during idle times. However, IEEE 802.11 PSM is known to cause unnecessary energy consumption due to the problems of an overhearing, a back-off time delay and possible packet collisions. To overcome these problems, we present a new MAC protocol called ´slot based PSM (static and dynamic)´ for IEEE 802.11 WLANs. In our proposed scheme, the beyond-ATIM window is divided into a number of time slots, and any node that participates in communication wakes up in its slot times only and other nodes can enter to doze mode during the slot times.