A Comparative Analysis on Benefits of Unscheduled Automatic Power Save Delivery Over Legacy Power Save Mode in IEEE 802.11 Wireless Networks

IEEE 802.11 is a standard that provides a basis for the world's most used wireless computer networks. For battery-based wireless stations saving the power is essential in Wi-Fi networks. In IEEE 802.11 power save mode, there is a minimal power consumption at wireless stations. This is done by deactivating stations occasionally and allowing the access point to buffer all the incoming packets in due time. The reason IEEE 802.11 introduced Unscheduled Automatic Power Save Delivery is to address the issues of legacies with the WMM classification. In our work, the benefits of time-driven Legacy Power Save Mode over event-driven Unscheduled Automatic Power Save Delivery are compared and discussed. Moreover, experimental analysis for Unscheduled Automatic Power Save Delivery is performed under various parameters to cover several cases for improving better battery life and longer performance. The results obtained with wire shark simulator predict that Unscheduled Automatic Power Save Delivery is better energy efficient than legacy Power Save Mode with a low Jitter and a low Latency across all Wireless Devices.