Designing energy efficient access points with Wi-Fi Direct

1389-1286/$ see front matter 2011 Elsevier B.V doi:10.1016/j.comnet.2011.06.012 ⇑ Corresponding author. E-mail addresses: [email protected] [email protected] (X. Pérez-Costa), seba (S. Sallent-Ribes). 1 In this paper we refer indistinctly to the set of from the work of the IEEE 802.11 group as Wi-Fi or Wi-Fi Direct is a new technology defined by the Wi-Fi Alliance in order to enable efficient device-to-device communication. Portable devices are a main target of this technology and hence, power saving is a key objective. In this paper we analyze the power saving protocols defined in Wi-Fi Direct and design two algorithms to efficiently use them: Adaptive Single Presence Period (ASPP) and Adaptive Multiple Presence Periods (AMPP). Operating only with layer two information, our proposed algorithms allow Wi-Fi Direct mobile devices to address the trade-off between performance and energy consumption in a configurable manner when offering access to an external network. The two algorithms presented, ASPP and AMPP, are evaluated by OPNET simulations. 2011 Elsevier B.V. All rights reserved.