Abstract
In this paper a method for video packets retransmission management on 802.11e WLANs and Enhanced Distributed Channel Access (EDCA) mechanism namely Smoothed Playout Delay-base Retry Adaptation (SPD-RA) has been offered. It estimate deadline of video packets based on maximum playout delay in receiver and with regards to some effective parameters in deadline. Since this approach requires the knowledge of Data-link layer from Application layer information, regarded as a Cross-layer approach. The methods is presented till now, didn't consist of these concepts and formulas which we notified. It is also demonstrated that the method which we presented improves the simplification and calculation speed. Results of simulations show that correct setting of SPD-RA parameters without statistical information collection make improvement of received video quality at receiver in bad network condition is possible up to 5 percent rather than previous approaches and more than 10 percent rather than EDCA standard.
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