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This paper introduces a MAC-layer Active Dropping (AD) scheme for achieving effective resource utilization and maintaining application-level quality of services in real-time video streaming over the emerging wireless broadband access networks based on Time-Division Multiple Access (TDMA). By proactively dropping the MAC-layer Protocol Data Units (MPDUs) of a video frames that are unlikely to meet its application-layer delay bound, the proposed scheme releases the precious transmission resources to the subsequent frames or other competing service streams. This leads to more efficient resource utilization than that by the conventional prioritization-based cross-layer approaches which simply manipulate transmission and/or retransmission priority of each MPDU.
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