Thirdly, higher connectivity
in the multi-hop mesh topology leads to better video streaming performance, at the expense
of complexity and network feedback requirements.
Fourthly, the study of the PLRs reported in Figure 5 in conjunction with the PSNR
results of Table 5.2 reveals that prioritization of video packets with respect to distortionreduction
incurred in the decoded video is extremely important. For example, even though
the ???Estimation based??? case has lower average PLR from the ???Highest Bandwidth??? case, it
performs worse in terms of PSNR since the latter achieves lower PLR for the most
significant classes of packets. This result emphasizes the fact that, in the case of analysis of
multimedia transmission over wireless, average PLRs that do not consider the significance
of the various packets for the application are not always relevant metrics for the system
performance.
Finally, it appears that even a limited horizon of information in the network
infrastructure can be extremely beneficial. We believe that the determination of an
appropriate ???horizon??? of information that provides the optimal trade off between the
overhead at the overlay network versus the improvement offered by utilizing dynamic
network feedback is an interesting research direction.
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