The traditional overlay approach involves a bunch of full trees, and uses multiple trees as a way around dealing with leaf nodes being unutilized. My approach uses multiple groupings, which do not overlay, screams within them, and does something completely different for the last hop. They're completely different architectures. I have trouble taking seriously any paper which says that it makes heavy use of multiple description coding. If you have congestion control, skips should be an extreme and bad event.
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