The exploitation of Wireless Sensor Networks (WSN) is constrained by limited power, low computing power and storage and short-range radio transmission. Many routing protocols respecting these constraints were develope...The exploitation of Wireless Sensor Networks (WSN) is constrained by limited power, low computing power and storage and short-range radio transmission. Many routing protocols respecting these constraints were developed but, it still lacks formal and standardized solutions being able to help in their configuration. The configuration management that responds to this concern is very important in this type of network. It consists of the definition of data models to configure and is very necessary for the good network performance. Tangible results were obtained in traditional networks with the emergence of NETCONF and YANG standards, but on the best of our humble knowledge there are none yet in WSNs. We propose in this paper wsn-routing-protocol, a YANG data model for routing protocols configuration in WSNs. Following our model, we propose two YANG configuration data models based on the latter: they are respectively aodv for AODV and rpl for RPL.展开更多
We suggest event collection protocol in a specific region where sensors are deployed to detect and collect events.In the traditional multi-hop routing in wireless sensor networks reporting events to a sink node or bas...We suggest event collection protocol in a specific region where sensors are deployed to detect and collect events.In the traditional multi-hop routing in wireless sensor networks reporting events to a sink node or base-station will cause imbalanced energy consumption of static sensors.To solve this problem,we use mobile sink.In this paper,we study the design of efficiency routing protocol for supporting efficient data collecting in mobile sink wireless sensor networks(mWSNs).We suggest the following two main ideas.First,we use reactive protocol to cut off unnecessary delay.Mobile sink makes a path to access to sensor node.Second,we model mobile sink movement depending on data frequency,so we can reduce moving distance efficiently.We simulate this protocol and compare it with the traditional method.Simulation results show this protocol reduces distance significantly and is suitable for mWSNs with heavy traffic.展开更多
In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side a...In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side application. Towards this goal, we first develop an analytical model that formulates the incast probability as a function of connection variables and network environment settings. We combine the model with the optimization theory and derive some insights into minimizing the incast probability through tuning connection variables related to applications. Then,enlightened by the analytical results, we propose an adaptive application-layer solution to the TCP incast.The solution equally allocates advertised windows to concurrent connections, and dynamically adapts the number of concurrent connections to the varying conditions. Simulation results show that our solution consistently eludes incast and achieves high goodput in various scenarios including the ones with multiple bottleneck links and background TCP traffic.展开更多
To improve the efficiency and coverage of stateful network protocol fuzzing, this paper proposes a new method, using a rule-based state machine and a stateful rule tree to guide the generation of fuzz testing data. Th...To improve the efficiency and coverage of stateful network protocol fuzzing, this paper proposes a new method, using a rule-based state machine and a stateful rule tree to guide the generation of fuzz testing data. The method first builds a rule-based state machine model as a formal description of the states of a network protocol. This removes safety paths, to cut down the scale of the state space. Then it uses a stateful rule tree to describe the relationship between states and messages, and then remove useless items from it. According to the message sequence obtained by the analysis of paths using the stateful rule tree and the protocol specification, an abstract data model of test case generation is defined. The fuzz testing data is produced by various generation algorithms through filling data in the fields of the data model. Using the rule-based state machine and the stateful rule tree, the quantity of test data can be reduced. Experimental results indicate that our method can discover the same vulnerabilities as traditional approaches, using less test data, while optimizing test data generation and improving test efficiency.展开更多
Due to having a large bandwidth to support Gbps-level data rate, terahertz communication attracts more and more attention in recent years. However, there are few medium access control （MAC） protocols for terahertz u...Due to having a large bandwidth to support Gbps-level data rate, terahertz communication attracts more and more attention in recent years. However, there are few medium access control （MAC） protocols for terahertz ultra-high data-rate wireless networks, which affects the research and application of terahertz communications. To address this problem and to achieve ultra-high data-rate wireless access with terahertz communication, a novel MAC protocol, called medium access control for terahertz communication （MAC-TC）, is proposed. Through designing a new channel access scheme, a new superframe structure, and related key parameters, MAC-TC can support a maximum data rate up to 10 Gbit/s even higher. Theoretical analysis and simulation results show that our proposed MAC protocol realizes the function of medium access control and attains a maximum data rate of 18.3 Gbit/s, which is 2 times higher than 5.78 Gbit/s, the theoretical maximum data rate of IEEE 802.15.3c standard.展开更多
基于5G高速率、低时延的特性,结合广播电视网络网际互连协议(Internet Protocol,IP)数据传输需求,提出一种融合深度强化学习与自适应阈值优化的IP数据封装方法。其基本原理是通过动态计算数据优先级、优化封装阈值及校验传输完整性等,...基于5G高速率、低时延的特性,结合广播电视网络网际互连协议(Internet Protocol,IP)数据传输需求,提出一种融合深度强化学习与自适应阈值优化的IP数据封装方法。其基本原理是通过动态计算数据优先级、优化封装阈值及校验传输完整性等,实现高效可靠的IP数据传输。实验结果表明,所提方法在服务质量(Quality of Service,QoS)保障成功率、封装效率、端到端时延及资源块利用率等方面显著优于传统数字视频广播-运动图像专家组(Digital Video Broadcasting-Moving Picture Experts Group,DVB-MPEG)方法,可为5G与广电网络深度融合提供技术支撑。展开更多
在移动直播场景中,多路径传输控制协议(Multi-Path Transmission Control Protocol,MPTCP)采用的默认调度策略是最小往返时延(Round-Trip Time,RTT)调度(MinRTT),仅依据最小RTT来选择传输路径。这一特性使得安全可靠的专网路径因时延略...在移动直播场景中,多路径传输控制协议(Multi-Path Transmission Control Protocol,MPTCP)采用的默认调度策略是最小往返时延(Round-Trip Time,RTT)调度(MinRTT),仅依据最小RTT来选择传输路径。这一特性使得安全可靠的专网路径因时延略高无法充分利用,且专网与公网切换不及时,容易引发画面卡顿问题。对此,提出一种基于MinRTT的专网优先无感切换调度策略。该策略通过优先检测专网的可用性,并利用卡尔曼滤波器对专网的RTT进行预测,从而实现专网优先传输数据和无感切换的效果。实验结果表明,与MinRTT相比,所提策略在移动直播场景中显著提升了传输稳定性。展开更多
文摘The exploitation of Wireless Sensor Networks (WSN) is constrained by limited power, low computing power and storage and short-range radio transmission. Many routing protocols respecting these constraints were developed but, it still lacks formal and standardized solutions being able to help in their configuration. The configuration management that responds to this concern is very important in this type of network. It consists of the definition of data models to configure and is very necessary for the good network performance. Tangible results were obtained in traditional networks with the emergence of NETCONF and YANG standards, but on the best of our humble knowledge there are none yet in WSNs. We propose in this paper wsn-routing-protocol, a YANG data model for routing protocols configuration in WSNs. Following our model, we propose two YANG configuration data models based on the latter: they are respectively aodv for AODV and rpl for RPL.
基金MKE(the Ministry of Knowledge Economy),Korea,under the Convergence-ITRC(Convergence Infor mation Technology Research Center)support program(NIPA-2011-C6150-1101-0004)supervised by the NIPA(National IT Industry Pro-motion Agency)
文摘We suggest event collection protocol in a specific region where sensors are deployed to detect and collect events.In the traditional multi-hop routing in wireless sensor networks reporting events to a sink node or base-station will cause imbalanced energy consumption of static sensors.To solve this problem,we use mobile sink.In this paper,we study the design of efficiency routing protocol for supporting efficient data collecting in mobile sink wireless sensor networks(mWSNs).We suggest the following two main ideas.First,we use reactive protocol to cut off unnecessary delay.Mobile sink makes a path to access to sensor node.Second,we model mobile sink movement depending on data frequency,so we can reduce moving distance efficiently.We simulate this protocol and compare it with the traditional method.Simulation results show this protocol reduces distance significantly and is suitable for mWSNs with heavy traffic.
基金supported by the Fundamental Research Fundsfor the Central Universities under Grant No.ZYGX2015J009the Sichuan Province Scientific and Technological Support Project under Grants No.2014GZ0017 and No.2016GZ0093
文摘In data centers, the transmission control protocol(TCP) incast causes catastrophic goodput degradation to applications with a many-to-one traffic pattern. In this paper, we intend to tame incast at the receiver-side application. Towards this goal, we first develop an analytical model that formulates the incast probability as a function of connection variables and network environment settings. We combine the model with the optimization theory and derive some insights into minimizing the incast probability through tuning connection variables related to applications. Then,enlightened by the analytical results, we propose an adaptive application-layer solution to the TCP incast.The solution equally allocates advertised windows to concurrent connections, and dynamically adapts the number of concurrent connections to the varying conditions. Simulation results show that our solution consistently eludes incast and achieves high goodput in various scenarios including the ones with multiple bottleneck links and background TCP traffic.
基金supported by the Key Project of National Defense Basic Research Program of China (No.B1120132031)supported by the Cultivation and Development Program for Technology Innovation Base of Beijing Municipal Science and Technology Commission (No.Z151100001615034)
文摘To improve the efficiency and coverage of stateful network protocol fuzzing, this paper proposes a new method, using a rule-based state machine and a stateful rule tree to guide the generation of fuzz testing data. The method first builds a rule-based state machine model as a formal description of the states of a network protocol. This removes safety paths, to cut down the scale of the state space. Then it uses a stateful rule tree to describe the relationship between states and messages, and then remove useless items from it. According to the message sequence obtained by the analysis of paths using the stateful rule tree and the protocol specification, an abstract data model of test case generation is defined. The fuzz testing data is produced by various generation algorithms through filling data in the fields of the data model. Using the rule-based state machine and the stateful rule tree, the quantity of test data can be reduced. Experimental results indicate that our method can discover the same vulnerabilities as traditional approaches, using less test data, while optimizing test data generation and improving test efficiency.
基金supported by the National Natural Science Foundation of China (60972068)the Program for Changjiang Scholars and Innovative Research Team in University (IRT1299)+2 种基金the project of Chongqing Municipal Education Commission (Kjzh11206)the Natural Science Foundation of Chongqing (cstc2012jjA40051)the open project of Emergency Communication Laboratory of Chongqing (201201)
文摘Due to having a large bandwidth to support Gbps-level data rate, terahertz communication attracts more and more attention in recent years. However, there are few medium access control （MAC） protocols for terahertz ultra-high data-rate wireless networks, which affects the research and application of terahertz communications. To address this problem and to achieve ultra-high data-rate wireless access with terahertz communication, a novel MAC protocol, called medium access control for terahertz communication （MAC-TC）, is proposed. Through designing a new channel access scheme, a new superframe structure, and related key parameters, MAC-TC can support a maximum data rate up to 10 Gbit/s even higher. Theoretical analysis and simulation results show that our proposed MAC protocol realizes the function of medium access control and attains a maximum data rate of 18.3 Gbit/s, which is 2 times higher than 5.78 Gbit/s, the theoretical maximum data rate of IEEE 802.15.3c standard.
文摘基于5G高速率、低时延的特性,结合广播电视网络网际互连协议(Internet Protocol,IP)数据传输需求,提出一种融合深度强化学习与自适应阈值优化的IP数据封装方法。其基本原理是通过动态计算数据优先级、优化封装阈值及校验传输完整性等,实现高效可靠的IP数据传输。实验结果表明,所提方法在服务质量(Quality of Service,QoS)保障成功率、封装效率、端到端时延及资源块利用率等方面显著优于传统数字视频广播-运动图像专家组(Digital Video Broadcasting-Moving Picture Experts Group,DVB-MPEG)方法,可为5G与广电网络深度融合提供技术支撑。
文摘在移动直播场景中,多路径传输控制协议(Multi-Path Transmission Control Protocol,MPTCP)采用的默认调度策略是最小往返时延(Round-Trip Time,RTT)调度(MinRTT),仅依据最小RTT来选择传输路径。这一特性使得安全可靠的专网路径因时延略高无法充分利用,且专网与公网切换不及时,容易引发画面卡顿问题。对此,提出一种基于MinRTT的专网优先无感切换调度策略。该策略通过优先检测专网的可用性,并利用卡尔曼滤波器对专网的RTT进行预测,从而实现专网优先传输数据和无感切换的效果。实验结果表明,与MinRTT相比,所提策略在移动直播场景中显著提升了传输稳定性。
