关键词: 无线局域网，IEEE 802. 11标准，电源管理，节能，时延

Abstract: Most nodes in a wireless local area networks (WLAN) arc powered by battery due to mobility requirement. Power conservation is significant for the nodes to prolong their run-time. Power management (PM) is presented in the IEEE 802. 11 standard, which allows nodes to enter dozing mode to save power when they are not engaged in data deli- very. I}he PM was modeled and analyzed so that the packet delay, the number of successive dozes, the active time, and the number of switches between active and doze modes were all derived. A delay aware power management (DAPM) scheme, which is suitable for IEEE 802. 11 infrastructure WI_ANs, was proposed and analyzed. hhe DAPM was able to help nodes seek the optimal dozing period so that the power consumption is minimized while the given delay requirement is met.

Key words: WLAN, IEEE 802. 11 standard, Power management, Energy conservation, Delay