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The IEEE802.11e defines a MAC protocol, which provides EDCA (enhanced distributed channel access) and HCCA (HCF controlled channel access) to support differentiation service over WLAN (wireless LAN). In IEEE802.11e WLAN, real-time application such as VoIP (Voice over IP) can have more chance to access the WM (wireless medium) than non realtime application. In addition to QoS support in WLAN, power consumption is a critical issue when WLAN is used in handheld devices. For power saving in the usedoi:10.1109/wcnc.2006.1696495 dblp:conf/wcnc/TakeuchiSY06a fatcat:tw3ilgimhfcexcysy2wckya2na