A novel cell dropping mechanism named adaptive early slice discard (adaptive-ESD) scheme is proposed to minimize the video quality degradation in a situation of losses due to buffer overflow. The mechanism runs at the video slice level and adaptively and selectively adjusts the discard level to switch buffer occupancy and video cell payload types. To evaluate its performance, we have designed an extended priority assignation scheme (ExPAS) which permits the definition of up to three priority classes per virtual connection. In comparison with previous space priority techniques based on the CLP mechanism, the adaptive-ESD associated with ExPAS shows better results in minimizing the probability of reception of corrupted video slices, as well as a significant improvement of the effective network throughput.
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