在容迟网络环境下,文中提出一种基于动态半马尔可夫路径搜索模型的分簇路由方法 CRSMP(Clustering Routing method based on Semi-Markov process and Path-finding strategy),该方法既考虑了节点拥有的社会属性所导致的分簇问题,又考...在容迟网络环境下,文中提出一种基于动态半马尔可夫路径搜索模型的分簇路由方法 CRSMP(Clustering Routing method based on Semi-Markov process and Path-finding strategy),该方法既考虑了节点拥有的社会属性所导致的分簇问题,又考虑到节点间未来一段时间内的最大相遇概率以及对应的相遇时间,结合分簇结果和相遇情况生成动态路由表,完成一种单副本的路由方法.该方法首先依据节点间路径的相似程度进行分簇,然后运用半马尔可夫模型预测节点间未来某一时刻的相遇概率,依据源节点和目的节点所在的分簇确定可以应用到路由中的节点集合,最后根据路径搜索策略找到最优路径,生成与当前时刻有关的动态路由表.仿真结果表明CRSMP在缓存较小的情况下投递成功率远高于DirectDeliveryRouter、FirstContactRouter和SimBetRouter三种单副本路由方式以及Spray and Wait、Epidemic和Prophet三种多副本路由协议.在10M缓存下的CRSMP有着与500M缓存下的Epidemic相近的路由性能.进一步在真实数据集上进行测试,测试结果表明CRSMP算法依然有着较好的路由性能.展开更多
An evolution model of KAD Dynamic Model Network(KDMN) is proposed to study the reason of hot node and simulate the process of network evolution based on node behavior from a holistic perspective.First,some symbols and...An evolution model of KAD Dynamic Model Network(KDMN) is proposed to study the reason of hot node and simulate the process of network evolution based on node behavior from a holistic perspective.First,some symbols and meanings are introduced to describe nodes relationship and network states at a time step.Second,some evolution rules for network are formulated when node behaviors of join,exit,routing table update,data retrieval and content index distribution happen with different contextual scene in KAD network.In addition,a lightweight simulator is designed to implement the KDMN model.Moreover,an example of how to use the simulator to simulate the network changes in order to observe the result is described in detail.Finally,the KDMN is applied to analyze the reason for the formation of hot nodes in the BT and eMule network in the experiment.The different evolution principles of local priority,global priority and hybrid random are adopted based on the provision of network protocol of BT and eMule.The result of this experiment demonstrates that there are some hot nodes exist in the KAD network.However,the principle of hybrid random can effectively alleviate the phenomenon that a node is widely linked with others compared with global and local priority.展开更多
文摘在容迟网络环境下,文中提出一种基于动态半马尔可夫路径搜索模型的分簇路由方法 CRSMP(Clustering Routing method based on Semi-Markov process and Path-finding strategy),该方法既考虑了节点拥有的社会属性所导致的分簇问题,又考虑到节点间未来一段时间内的最大相遇概率以及对应的相遇时间,结合分簇结果和相遇情况生成动态路由表,完成一种单副本的路由方法.该方法首先依据节点间路径的相似程度进行分簇,然后运用半马尔可夫模型预测节点间未来某一时刻的相遇概率,依据源节点和目的节点所在的分簇确定可以应用到路由中的节点集合,最后根据路径搜索策略找到最优路径,生成与当前时刻有关的动态路由表.仿真结果表明CRSMP在缓存较小的情况下投递成功率远高于DirectDeliveryRouter、FirstContactRouter和SimBetRouter三种单副本路由方式以及Spray and Wait、Epidemic和Prophet三种多副本路由协议.在10M缓存下的CRSMP有着与500M缓存下的Epidemic相近的路由性能.进一步在真实数据集上进行测试,测试结果表明CRSMP算法依然有着较好的路由性能.
文摘An evolution model of KAD Dynamic Model Network(KDMN) is proposed to study the reason of hot node and simulate the process of network evolution based on node behavior from a holistic perspective.First,some symbols and meanings are introduced to describe nodes relationship and network states at a time step.Second,some evolution rules for network are formulated when node behaviors of join,exit,routing table update,data retrieval and content index distribution happen with different contextual scene in KAD network.In addition,a lightweight simulator is designed to implement the KDMN model.Moreover,an example of how to use the simulator to simulate the network changes in order to observe the result is described in detail.Finally,the KDMN is applied to analyze the reason for the formation of hot nodes in the BT and eMule network in the experiment.The different evolution principles of local priority,global priority and hybrid random are adopted based on the provision of network protocol of BT and eMule.The result of this experiment demonstrates that there are some hot nodes exist in the KAD network.However,the principle of hybrid random can effectively alleviate the phenomenon that a node is widely linked with others compared with global and local priority.
