一种基于网络节点距离（节点间RTT值），将节点动态的划分在相应的聚类内，每个聚类有一个中心节点，其成员节点到它的距离不超过某一设定值-A network node based on distance (inter-node RTT value), the delineation of the dynamic nodes in the corresponding cluster, each cluster has a central node, the node of its members to