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This paper proposes a packet scheduling scheme for QoS support in audio-video transmission with IEEE 802.11e HCCA. In the proposed scheme, the Access Point (AP) basically allocates Transmission OPportunity (TXOP) for each station like the reference scheduler of the IEEE 802.11e standard, which is referred to as the TGe scheme in this paper. However, the AP with the proposed scheme can allocate additional TXOP in a Service Interval (SI) if the AP has received corrupted MAC Protocol Data Units (MPDUs) in the previous SI. In addition, the proposed scheme calculates the number of MAC Service Data Units (MSDUs) arrived in an SI, considering the inter-arrival time of audio samples and that of video frames, which are referred to as Media Units (MUs), at the application-layer.
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