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节点相遇特征是构建机会网络节点运动模型、实现数据机会转发的基础,也是研究机会网络的动态拓扑演化规律,指导网络部署,特别是移动节点部署的重要依据.以4个实测数据集为对象,研究了基于节点度的节点相遇空间特征:节点度分布很不均衡;随着节点度的增加,任意相遇次数按照幂律递增,核心节点比孤僻节点对消息传输成功率的贡献更大;研究了基于任意相遇时间间隔的节点相遇时间特征:多数任意相遇时间间隔和相遇持续时间都很小,相遇持续时间较小的记录对消息传输成功率影响较大,而相遇持续时间达到一定值后,时间的增长对消息传输成功率的贡献可以忽略不计.这些时空特征对于构建机会数据传递方法,解决无网络覆盖或覆盖不佳区域的通信难题具有重要意义.
The characteristics of node encounter are the basis for constructing the motion model of opportunistic network node and realizing the data forwarding. It is also an important basis for studying the dynamic topology evolution of opportunistic network and guiding the deployment of the network, especially for mobile node deployment. With 4 measured data sets as the object, The spatial characteristics of node encounter based on node degree are studied. The node degree distribution is unbalanced. With the increase of node degree, the number of any encounters increases according to power law. The core node contributes more to the success rate of message transmission than that of solitary node. The meeting time characteristics of nodes based on arbitrary encounter time interval: Most of the random encounter time intervals and the duration of encountering are very small, and the records with smaller duration of encounters have a greater influence on the successful rate of message transmission. When the duration of the encounter reaches a certain value, Of the contribution to the success rate of message transmission is negligible.These spatio-temporal features are of great significance for constructing the opportunity data transmission method and solving the communication problem without network coverage or poor coverage area.