Date Added: Jul 2009
In order to support the Quality of Service (QoS) requirements at the Medium Access Control (MAC) layer, the Enhanced Distributed Channel Access (EDCA) has been developed in IEEE 802.11e standard. However, it cannot guarantee the stringent real-time constraints of multimedia applications such as voice and video without an efficient method of controlling network loads. In this paper, the authors propose a measurement-based admission control scheme, which is made up of two parts: priority access and admission control. First, in order to measure the channel status per traffic type, they propose a priority access mechanism in which each priority traffic is distinguished by a busy tone, and separately performs its own packet transmission operation.