The industrial Internet of Things(IIoT)is a new indus-trial idea that combines the latest information and communica-tion technologies with the industrial economy.In this paper,a cloud control structure is designed for...The industrial Internet of Things(IIoT)is a new indus-trial idea that combines the latest information and communica-tion technologies with the industrial economy.In this paper,a cloud control structure is designed for IIoT in cloud-edge envi-ronment with three modes of 5G.For 5G based IIoT,the time sensitive network(TSN)service is introduced in transmission network.A 5G logical TSN bridge is designed to transport TSN streams over 5G framework to achieve end-to-end configuration.For a transmission control protocol(TCP)model with nonlinear disturbance,time delay and uncertainties,a robust adaptive fuzzy sliding mode controller(AFSMC)is given with control rule parameters.IIoT workflows are made up of a series of subtasks that are linked by the dependencies between sensor datasets and task flows.IIoT workflow scheduling is a non-deterministic polynomial(NP)-hard problem in cloud-edge environment.An adaptive and non-local-convergent particle swarm optimization(ANCPSO)is designed with nonlinear inertia weight to avoid falling into local optimum,which can reduce the makespan and cost dramatically.Simulation and experiments demonstrate that ANCPSO has better performances than other classical algo-rithms.展开更多
Satellite link characteristics drastically degrade transport control protocol （TCP） performance. An efficient performance enhancing scheme is proposed. The improvement of TCP performance over satellite-based Interue...Satellite link characteristics drastically degrade transport control protocol （TCP） performance. An efficient performance enhancing scheme is proposed. The improvement of TCP performance over satellite-based Interuet is accomplished by protocol transition gateways at each end of a satellite link. The protocol which runs over a satellite link executes the receiver-driven flow control and acknowledgements- and timeouts-based error control strategies. The validity of this TCP performance enhancing scheme is verified by a series of simulation experiments. Results show that the proposed scheme can efficiently enhance the TCP performance over satellite-based Internet and ensure that the available bandwidth resources of the satellite link are fully utilized.展开更多
近年来,关于因特网业务量多重分形性的研究已成为网络通信研究领域的一个热点.目前,在关于这一多重分形性的成因方面已经有了一些研究成果,大部分都认为这是由现代网络分层的体系结构造成的.然而这些结论对现代因特网的负载极重这一事...近年来,关于因特网业务量多重分形性的研究已成为网络通信研究领域的一个热点.目前,在关于这一多重分形性的成因方面已经有了一些研究成果,大部分都认为这是由现代网络分层的体系结构造成的.然而这些结论对现代因特网的负载极重这一事实及其对网络业务量性质的影响没有给予充分的重视.通过对已有成果的研究,结果表明,在网络处于重负载的条件下,业务量多重分形性是由于TCP(transmission control protocol)独特的发送行为和多个TCP连接的汇聚造成的.为了支持这一结论,利用小波分析、模型模拟分析、实际数据计算等手段,从多个方面进行了论证.由于该发现是由现代因特网的实际情况得出的,因而比某些现有的结论更加接近实际,并且对因特网的网络设计和性能估计等方面具有重要的理论指导意义和实际使用价值.展开更多
文摘The industrial Internet of Things(IIoT)is a new indus-trial idea that combines the latest information and communica-tion technologies with the industrial economy.In this paper,a cloud control structure is designed for IIoT in cloud-edge envi-ronment with three modes of 5G.For 5G based IIoT,the time sensitive network(TSN)service is introduced in transmission network.A 5G logical TSN bridge is designed to transport TSN streams over 5G framework to achieve end-to-end configuration.For a transmission control protocol(TCP)model with nonlinear disturbance,time delay and uncertainties,a robust adaptive fuzzy sliding mode controller(AFSMC)is given with control rule parameters.IIoT workflows are made up of a series of subtasks that are linked by the dependencies between sensor datasets and task flows.IIoT workflow scheduling is a non-deterministic polynomial(NP)-hard problem in cloud-edge environment.An adaptive and non-local-convergent particle swarm optimization(ANCPSO)is designed with nonlinear inertia weight to avoid falling into local optimum,which can reduce the makespan and cost dramatically.Simulation and experiments demonstrate that ANCPSO has better performances than other classical algo-rithms.
文摘Satellite link characteristics drastically degrade transport control protocol （TCP） performance. An efficient performance enhancing scheme is proposed. The improvement of TCP performance over satellite-based Interuet is accomplished by protocol transition gateways at each end of a satellite link. The protocol which runs over a satellite link executes the receiver-driven flow control and acknowledgements- and timeouts-based error control strategies. The validity of this TCP performance enhancing scheme is verified by a series of simulation experiments. Results show that the proposed scheme can efficiently enhance the TCP performance over satellite-based Internet and ensure that the available bandwidth resources of the satellite link are fully utilized.
文摘近年来,关于因特网业务量多重分形性的研究已成为网络通信研究领域的一个热点.目前,在关于这一多重分形性的成因方面已经有了一些研究成果,大部分都认为这是由现代网络分层的体系结构造成的.然而这些结论对现代因特网的负载极重这一事实及其对网络业务量性质的影响没有给予充分的重视.通过对已有成果的研究,结果表明,在网络处于重负载的条件下,业务量多重分形性是由于TCP(transmission control protocol)独特的发送行为和多个TCP连接的汇聚造成的.为了支持这一结论,利用小波分析、模型模拟分析、实际数据计算等手段,从多个方面进行了论证.由于该发现是由现代因特网的实际情况得出的,因而比某些现有的结论更加接近实际,并且对因特网的网络设计和性能估计等方面具有重要的理论指导意义和实际使用价值.
