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In this paper, the authors study the issue of scalable video streaming over IEEE 802.11e EDCA WLANs. Their basic idea is to control the number of "Active" nodes on the channel in order to reduce collisions under heavy traffic conditions. Specifically, they propose a distributed On-Off Queue Control (OOQC) mechanism, which is designed to maintain high network throughput while keeping packet loss due to collision as low as possible. A Low Priority Early Drop (LPED) method is also employed to drop the packets at the queue according to packet Relative Priority Index (RPI) provided by scalable video coding. Simulation results show that their proposed OOQC scheme significantly outperforms EDCA in received video quality.
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