Study and Analysis of Performance of IEEE 802.11 Power Saving Mode

The nodes need to be turned into low-power states when they are not in use to conserve energy and power for battery- powered wireless devices. One of the most important techniques in wireless LAN and multi-hop wireless networks is the IEEE 802.11 power saving mode which is used to coordinate the power states of communication devices [1]. Energy performance and bandwidth resource limitations are the backbone of any ad hoc network design. Multi-rate adaptation architectures had been proposed to increase bandwidth utilization efficiency and to reduce the control overhead [4]. Simulations were performed in order to see how specific parameters influence the performance of the power saving mechanism for the wireless Local Area Networks in IEEE 802.11. Simulations were made for an ad hoc-network with 25 stations. The throughput were obtained for specific window size and beacon interval and then an optimal ratio between ATIM window interval and beacon interval is recommended. It is found that the ratio between ATIM window interval and beacon interval should be between 30 to 40 percent