基于耦合强度的双层网络数据传输能力  

Data traffic capability of double-layer network based on coupling strength

作　　者：马金龙 杜长峰 隋伟 许向阳[1] Ma Jin-Long;Du Chang-Feng;Sui Wei;Xu Xiang-Yang(School of Information Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Science and Technology on Communication Networks Laboratory,Shijiazhuang 050081,China)

机构地区：[1]河北科技大学信息科学与工程学院,石家庄050018 [2]通信网信息传输与分发技术重点实验室,石家庄050081

出　　处：《物理学报》2020年第18期341-352,共12页Acta Physica Sinica

基　　金：河北省高等学校科学技术研究项目(批准号:QN2019081);石家庄市科学技术研究与发展计划(批准号:195790055A);河北省社会科学发展研究项目(批准号:2019041201007)资助的课题.

摘　　要：为了降低网络拥塞,提升网络传输性能,对双层网络之间的耦合机理进行研究,层间关系依据度度相关性分成三种耦合方式:随机耦合、异配耦合、同配耦合.在基于最短路径路由策略和基于度的权重路由策略条件下,分析网络数据包的传输过程,并研究双层网络的耦合方式及其适合的路由策略对网络传输容量的影响.采用双层无标度网络进行仿真实验,分析在路由策略约束下传输容量和耦合方式之间的关系,依据双层网络之间耦合方式的特点,找出适合每一种路由策略的最佳耦合方式以提升网络的传输容量.经过仿真发现,采用最短路径路由策略时,异配耦合方式最佳;采用基于度的静态权重路由策略时,同配耦合方式最佳.路由策略在匹配的耦合方式下使得网络流量分配均匀,有利于网络传输容量的提升.本研究为实际网络设计和传输性能优化提供了理论基础.The two-layer network model offers us a new viewpoint to observe the traffic dynamics of multilayer network systems.An efficient coupling mechanism is of great importance for alleviating the traffic congestion on two-layer networks.In order to reduce the network congestion and improve network transmission performance,the coupling mechanism between two layers of network and three coupling methods,which are random coupling,disassortative coupling and assortative coupling,are studied based on degree correlation.The packet transmission process is analyzed with both the shortest path routing strategy and degree-based weight routing strategy.The influences of the coupling mode and its corresponding routing strategy on the traffic capacity of the two-layer network are studied.In this paper,two scale-free networks are used to construct the two-layer network for simulation experiments.The network scale is in a range from 200 to 2400 with the value of average degree being 8.We focus on the traffic dynamics of two-layer network,and analyze the relationship between the traffic capacity and the three coupling modes,which are random coupling,disassortative coupling and assortative coupling,under the constraints of the shortest path routing strategy and the weight-based routing strategy.According to the characteristics of the coupling connection between the two layers of network,the best coupling method which is suitable for a certain routing strategy should be investigated.The suitable coupling connection between the two layers can effectively increase the traffic capacity.Both numerical result and analytical result show that the packet generation rate,average transmission time,and average throughput can be obviously improved under the shortest path routing strategy with the disassortative coupling method.When the degree-based static weight routing strategy is used,the traffic performance parameters such as packet generation rate,average transmission time,and average throughput can reach the optimal values with the assortative

关 键 词：耦合网络 传输容量 耦合强度 平均路径长度 

分 类 号：TN919.3[电子电信—通信与信息系统]