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Most of the wireless LANs deployed today is IEEE 802.11b/g compliant. Since IEEE 802.11 standard specifies a contention based MAC- DCF, it cannot support QoS requirements of real-time traffic like voice or video. Thus these WLANs are not suitable for supporting real-time voice traffic. In this paper, the authors propose an admission control scheme "SmartCAC", which without modifying the basic access mechanism of IEEE 802.11 tries to guarantee QoS for voice traffic. SmartCAC is a channel BW allocation scheme; in which most of the available BW is reserved for real-time voice traffic and remaining small amount is allocated to non real-time data traffic. Moreover, the BW allocation is not static; rather it can be dynamically changed depending on traffic conditions.
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