Wireless Local Area Network (WLAN) has become ubiquitous owing to the great demands of pervasive mobile applications. It has been shown that a cross-layer design can improve the overall performance for a wireless communication system. Recently, joint multiuser video source coding and communication has drawn attention since it can leverage the diversity of video contents and radio resources to achieve more desired quality. In this paper, a real-time video conferencing framework is proposed for multiple conferencing pairs by joint considering the uplink and downlink conditions within IEEE802.11 networks. This system is formulated as to minimize the maximal end-to-end expected distortion received by all users by selecting the PHY modes and transmission time.
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