Performance Analysis and Comparison between Legacy-PSM and U-APSD



This paper evaluates the performance of the most popular power saving mechanisms defined in the IEEE 802.11 standard, namely the Power Save Mode (Legacy-PSM) and the Unscheduled Automatic Power Save Delivery (U-APSD). The assessment comprises a detailed study concerning energy efficiency and capability to guarantee the required Quality of Service (QoS) for a certain application. The results, obtained in the OMNeT++ simulator, showed that U-APSD is more energy efficient than Legacy-PSM without compromising the end-to-end delay. Both U-APSD and Legacy-PSM revealed capability to guarantee the application QoS requirements in all the studied scenarios. However, unlike U-APSD, when Legacy-PSM is used in the presence of QoS demanding applications, all the stations connected to the network through the same access point will consume noticeable additional energy.


IEEE 802.11, Energy Efficiency, Power Save Mode, U-APSD


Energy efficiency

Related Project

COST Action IC0906: WiNeMO - Wireless Networking for Moving Objects


13th Portuguese Conference on Computer Networks (CRC 2013), 14-15 November 2013, Leiria, Portugal, November 2013

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