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In this paper, the authors propose an adaptive system for improving videophone transmission over EDCA. They consider that a videophone contains a Constant Bit Rate (CBR) voice source and a rate-adaptive video source. Two issues are addressed in this research. Firstly, how to solve the AP bottleneck problem, and secondly, how to adjust video source rate to improve the network performance. For the first issue, they propose the adjustment of the Transmission OPportunity (TXOP) to give AP a higher priority in voice transmission in order to eliminate the AC3 transmission bottleneck at the AP. For the second issue, their principle is to guarantee the throughput of voice traffic while transmitting as much video traffic as possible.
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