At present,the research of blockchain is very popular,but the practical application of blockchain is very few.The main reason is that the concurrency of blockchain is not enough to support application scenarios.After ...At present,the research of blockchain is very popular,but the practical application of blockchain is very few.The main reason is that the concurrency of blockchain is not enough to support application scenarios.After that,applications such as Intervalue increase the concurrency of blockchain transactions.However,due to the problems of network bandwidth and algorithm performance,there is always a broadcast storm,which affects the normal use of nodes in the whole network.However,the emergence of broadcast storms needs to rely on the node itself,which may be very slow.Even if developers debug the corresponding code,they cannot conduct an effective test in the whole network.Broadcast storm problem mainly occurs in scenarios with large transaction volume,such as the financial industry.Due to its characteristics,the concurrency of transactions in the financial industry will increase at a certain time.If there is no effective algorithm to deal with it,the broadcast storm will be triggered and the whole network will be paralyzed.To solve the problem of the broadcast storm,this paper combines blockchain,peer-to-peer network,artificial intelligence,and other technologies,and proposes a broadcast storm detection and processing method based on situation awareness.The purpose is to cut off the further spread of broadcast storms from the node itself and maintain the normal operation of the whole network nodes.展开更多
An improved internetworking approach is proposed to enhance the Internet connectivity which is deteriorated due to unidirectional links and blind rebroadcasting of gateway discovery packets for mobile ad hoc networks....An improved internetworking approach is proposed to enhance the Internet connectivity which is deteriorated due to unidirectional links and blind rebroadcasting of gateway discovery packets for mobile ad hoc networks. The hybrid gateway discovery scheme that combined the advantages of a proactive and reactive gateway discovery approach is used to achieve high connectivity while keeping overhead costs low. By exchanging ad hoc on-demand distance vector （AODV） hello packet which includes additional fields named symmetric neighbor list and asymmetric neighbor list, unidirectional links are removed from route computation and broadcast storm can also be relieved simultaneously. Performance results using ns-2 simulations, under varying numbers of unidirectional links and node speeds, show that this improved Internet connectivity approach can provide better performance than others.展开更多
典型的按需路由协议AODV(Ad Hoc on-demand distance vector)易产生大量冗余包,可能导致广播风暴问题,降低MANET(mobile Ad Hoc networks)路由协议性能。为此,提出基于概率广播路由请求RREQ(route REQuest)控制包的AODV的改进协议,记为P...典型的按需路由协议AODV(Ad Hoc on-demand distance vector)易产生大量冗余包,可能导致广播风暴问题,降低MANET(mobile Ad Hoc networks)路由协议性能。为此,提出基于概率广播路由请求RREQ(route REQuest)控制包的AODV的改进协议,记为P_RREQ+AODV。依据信干扰比SINR(signal to interference plus noise ratio)和节点密度计算节点转发RREQ的概率,降低路由开销和传输时延,提高吞吐量。仿真结果表明,与传统的AODV协议相比,P_RREQ+AODV协议的路由开销降低了近50%,吞吐量提高了23%。展开更多
在车载网络VANETs（Vehicle Ad Hoc Networks）中,采用广播技术分发数据包。为此,提出基于概率和时延的混合的车载网络广播PDHB（Probabilistic and Delay-based Hybrid Broadcast）协议。PDHB协议主要由转发概率计算阶段和定时时延2个...在车载网络VANETs（Vehicle Ad Hoc Networks）中,采用广播技术分发数据包。为此,提出基于概率和时延的混合的车载网络广播PDHB（Probabilistic and Delay-based Hybrid Broadcast）协议。PDHB协议主要由转发概率计算阶段和定时时延2个阶段。首先,利用车辆密度和距离信息计算转发概率,然后再利用转发概率设置定时,进而减少冗余数据包,缓解广播风暴问题。仿真结果表明,与泛洪广播协议相比,PDHB协议的冗余数据包下降近20%,数据包投递成功率提高了23%。展开更多
Named Data Network(NDN) has caused wide concerns in VANET community because NDN uses a content-centric mechanism that naming content rather than the host. However, integrating NDN into VANET(NDN-VANET) also faces seve...Named Data Network(NDN) has caused wide concerns in VANET community because NDN uses a content-centric mechanism that naming content rather than the host. However, integrating NDN into VANET(NDN-VANET) also faces several challenges including consumer/provider mobile, broadcast storm problem and so on. In this paper, we propose a Bayesian-based Receiver Forwarding Decision(BRFD) scheme to mitigate the broadcast storm problem incurred by interest packets in NDN-VANET. In the BRFD, vehicles received an interest packet are required to make forwarding decisions based on Bayesian decision theory according to current network conditions obtained by neighbor interaction. However, the receiver-forwarding decision in BRFD can also cause a conflict issue because multiple vehicles forward copies of the same packet at the same time. So a back-off mechanism is introduced in BRFD. Experimental results show that the BRFD algorithm has better performance in several aspects in contrast to probability-based forwarding scheme and "bread crumb" routing.展开更多
针对IP网络设备在使用过程中产生的广播风暴、传输数据丢包、MP-group(Multilink-group,复用链路组)接口链路层运行PPP(Point to Point Protocol,点对点协议)异常等问题,结合华为S9300交换机设备、NE40E路由器设备的工作原理,对策略路...针对IP网络设备在使用过程中产生的广播风暴、传输数据丢包、MP-group(Multilink-group,复用链路组)接口链路层运行PPP(Point to Point Protocol,点对点协议)异常等问题,结合华为S9300交换机设备、NE40E路由器设备的工作原理,对策略路由机理、STP(Spanning Tree Protocol生成树协议)、广播数据帧复制过程进行了研究和分析。并通过分析问题产生的机理,发现了目前网络数据配置存在的不足,提出了在核心层交换机上配置流过滤策略等应对措施和快速处理故障的方法,对系统进行了完善与改进,并优化了相关领域的应用,为维护人员在任务中迅速、合理地实施应急处置提供了参考。展开更多
泛洪被作为实现广播通信的最简单的技术,广泛应用于车联网VANET(vehicular Ad Hoc network)路由。然而,由于VANET中节点的快速移动以及网络拓扑动态变化,简单的泛洪容易导致大量的冗余数据包,并引发广播风暴。为此,以典型的按需式距离...泛洪被作为实现广播通信的最简单的技术,广泛应用于车联网VANET(vehicular Ad Hoc network)路由。然而,由于VANET中节点的快速移动以及网络拓扑动态变化,简单的泛洪容易导致大量的冗余数据包,并引发广播风暴。为此,以典型的按需式距离矢量路由协议AODV(Ad Hoc on-demand distance vector)为基础,提出基于概率转发的AODV路由协议,记为AODV_P。AODV_P协议利用概率转发机制替代AODV中的泛洪。节点利用距离、密度信息计算转发概率,并依据转发概率设置计时器。计时器时间越短,成为下一跳转发节点的可能性越大。仿真结果表明,提出的AODV_P能够有效降低冗余数据包,缓解广播风暴问题。与AODV协议相比,AODV_P在传输时延、数据包传输率方面得到了有效提高。展开更多
基金Supported by the Open Research Fund of Key Laboratory of Network Crime Investigation of Hunan Provincial Colleges,Grant No.2018WLFZZC003.
文摘At present,the research of blockchain is very popular,but the practical application of blockchain is very few.The main reason is that the concurrency of blockchain is not enough to support application scenarios.After that,applications such as Intervalue increase the concurrency of blockchain transactions.However,due to the problems of network bandwidth and algorithm performance,there is always a broadcast storm,which affects the normal use of nodes in the whole network.However,the emergence of broadcast storms needs to rely on the node itself,which may be very slow.Even if developers debug the corresponding code,they cannot conduct an effective test in the whole network.Broadcast storm problem mainly occurs in scenarios with large transaction volume,such as the financial industry.Due to its characteristics,the concurrency of transactions in the financial industry will increase at a certain time.If there is no effective algorithm to deal with it,the broadcast storm will be triggered and the whole network will be paralyzed.To solve the problem of the broadcast storm,this paper combines blockchain,peer-to-peer network,artificial intelligence,and other technologies,and proposes a broadcast storm detection and processing method based on situation awareness.The purpose is to cut off the further spread of broadcast storms from the node itself and maintain the normal operation of the whole network nodes.
基金The National Natural Science Foundation of China(No60362001)
文摘An improved internetworking approach is proposed to enhance the Internet connectivity which is deteriorated due to unidirectional links and blind rebroadcasting of gateway discovery packets for mobile ad hoc networks. The hybrid gateway discovery scheme that combined the advantages of a proactive and reactive gateway discovery approach is used to achieve high connectivity while keeping overhead costs low. By exchanging ad hoc on-demand distance vector （AODV） hello packet which includes additional fields named symmetric neighbor list and asymmetric neighbor list, unidirectional links are removed from route computation and broadcast storm can also be relieved simultaneously. Performance results using ns-2 simulations, under varying numbers of unidirectional links and node speeds, show that this improved Internet connectivity approach can provide better performance than others.
文摘典型的按需路由协议AODV(Ad Hoc on-demand distance vector)易产生大量冗余包,可能导致广播风暴问题,降低MANET(mobile Ad Hoc networks)路由协议性能。为此,提出基于概率广播路由请求RREQ(route REQuest)控制包的AODV的改进协议,记为P_RREQ+AODV。依据信干扰比SINR(signal to interference plus noise ratio)和节点密度计算节点转发RREQ的概率,降低路由开销和传输时延,提高吞吐量。仿真结果表明,与传统的AODV协议相比,P_RREQ+AODV协议的路由开销降低了近50%,吞吐量提高了23%。
文摘在车载网络VANETs（Vehicle Ad Hoc Networks）中,采用广播技术分发数据包。为此,提出基于概率和时延的混合的车载网络广播PDHB（Probabilistic and Delay-based Hybrid Broadcast）协议。PDHB协议主要由转发概率计算阶段和定时时延2个阶段。首先,利用车辆密度和距离信息计算转发概率,然后再利用转发概率设置定时,进而减少冗余数据包,缓解广播风暴问题。仿真结果表明,与泛洪广播协议相比,PDHB协议的冗余数据包下降近20%,数据包投递成功率提高了23%。
基金supported by NSFC No.61461027,No.61562059Innovation Promotion Education Fund of Ministry of Education 2018A05003Overseas exchange fund for faculty of the Lanzhou University of Technology12。
文摘Named Data Network(NDN) has caused wide concerns in VANET community because NDN uses a content-centric mechanism that naming content rather than the host. However, integrating NDN into VANET(NDN-VANET) also faces several challenges including consumer/provider mobile, broadcast storm problem and so on. In this paper, we propose a Bayesian-based Receiver Forwarding Decision(BRFD) scheme to mitigate the broadcast storm problem incurred by interest packets in NDN-VANET. In the BRFD, vehicles received an interest packet are required to make forwarding decisions based on Bayesian decision theory according to current network conditions obtained by neighbor interaction. However, the receiver-forwarding decision in BRFD can also cause a conflict issue because multiple vehicles forward copies of the same packet at the same time. So a back-off mechanism is introduced in BRFD. Experimental results show that the BRFD algorithm has better performance in several aspects in contrast to probability-based forwarding scheme and "bread crumb" routing.
文摘针对IP网络设备在使用过程中产生的广播风暴、传输数据丢包、MP-group(Multilink-group,复用链路组)接口链路层运行PPP(Point to Point Protocol,点对点协议)异常等问题,结合华为S9300交换机设备、NE40E路由器设备的工作原理,对策略路由机理、STP(Spanning Tree Protocol生成树协议)、广播数据帧复制过程进行了研究和分析。并通过分析问题产生的机理,发现了目前网络数据配置存在的不足,提出了在核心层交换机上配置流过滤策略等应对措施和快速处理故障的方法,对系统进行了完善与改进,并优化了相关领域的应用,为维护人员在任务中迅速、合理地实施应急处置提供了参考。
文摘泛洪被作为实现广播通信的最简单的技术,广泛应用于车联网VANET(vehicular Ad Hoc network)路由。然而,由于VANET中节点的快速移动以及网络拓扑动态变化,简单的泛洪容易导致大量的冗余数据包,并引发广播风暴。为此,以典型的按需式距离矢量路由协议AODV(Ad Hoc on-demand distance vector)为基础,提出基于概率转发的AODV路由协议,记为AODV_P。AODV_P协议利用概率转发机制替代AODV中的泛洪。节点利用距离、密度信息计算转发概率,并依据转发概率设置计时器。计时器时间越短,成为下一跳转发节点的可能性越大。仿真结果表明,提出的AODV_P能够有效降低冗余数据包,缓解广播风暴问题。与AODV协议相比,AODV_P在传输时延、数据包传输率方面得到了有效提高。
