In this paper, the authors proposed a novel hybrid tree-mesh design that leverages both overlays. The key ideas is to identify a set of stable nodes to construct a tree-based backbone, called tree bone. These stables trees form a mesh overlay which can accommodate node dynamics and exploit the available bandwidth between overlay nodes.
Tree optimization
(1)High degree preemption
(2)low delay jump
Limitations:
(1) how to find the stable nodes? In optimal stable node identification. the stability of a node is proportional to its duration in the overlay. The longer the node stays in the system, the node is more stable?
(2) The overlays setup protocol is not discussed in detail.
(3)how about there is not enough stable nodes to support a large number of out-skirt nodes?
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