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In this paper, the authors propose a scheme, called Video Packet Adaptation Layer (VPAL), for reliable video multicast over the IEEE 802.11n WLAN. VPAL is composed of raptor coding for reliable video transmission, header compression and packet aggregation, both for efficient video transmission. Most of the VPAL functionalities reside above the emerging IEEE 802.11n Medium Access Control (MAC) layer while the packet aggregation requires some changes in the MAC functionalities. The reliability of the video multicast under a strict delay requirement is provided by achieving the target error probability of video packets, which is done by controlling both the Raptor code rate and the PHYsical (PHY) layer transmission rate.
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