能量平衡和延迟约束的水声网络路由协议

水声网络路由协议是水声网络研究的一个热点问题。水声网络路由协议面临着节点能量有限、带宽窄、高传播延迟等的限制。本文从能量和延迟角度出发,设计了一种能量平衡和延迟约束的路由协议。该协议通过感知周边节点能量和负载,使得节点在选择转发节点时尽量选择剩余能量高的节点,同时在网络负载较高时能有效避开网络拥塞区域,从而在能量均衡的同时降低数据包的端到端延迟。     

Fuzzy-based Adaptive Routing Algorithm for Networks-on-Chip

In this paper, we propose two adaptive routing algorithms to alleviate congestion in the network. In the first algorithm, the routing decision is assisted by the number of occupied buffer slots at the corresponding input buffer of the next router and the congestion level of that router. Although this algorithm performs better than the conventional method, DyXY, in some cases the proposed algorithm leads to non-optimal decisions. Fuzzy controllers compensate for ambiguities in the data by giving a level of confidence rather than declaring the data simply true or false. To make a better routing decision, we propose an adaptive routing algorithm based on fuzzy logic for Networks-on-chip where the routing path is determined based on the current condition of the network. The proposed algorithm avoids congestion by distributing traffic over the routers that are less congested or have a spare capacity. The output of the fuzzy controller is the congestion level, so that at each router, the neighboring router with the lowest congestion value is chosen for routing a packet. To evaluate the proposed routing method, we use two multimedia applications and two synthetic traffic profiles. The experimental results show that the fuzzy-based routing scheme improves the performance over the DyXY routing algorithm by up to 25% with a negligible hardware overhead.     

Backscatter from the data plane – Threats to stability and security in information-centric network infrastructure

Information-centric networking (ICN) raises data objects to first class routable entities in the network and changes the Internet paradigm from host-centric connectivity to data-oriented delivery. However, current approaches to content routing heavily rely on data-driven protocol events and thereby introduce a strong coupling of the control to the data plane in the underlying routing infrastructure. In this paper, threats to the stability and security of the content distribution system are analyzed in theory, simulations, and practical experiments. We derive relations between state resources and the performance of routers, and demonstrate how this coupling can be misused in practice. We further show how state-based forwarding tends to degrade by decorrelating resources. We identify intrinsic attack vectors present in current content-centric routing, as well as possibilities and limitations to mitigate them. Our overall findings suggest that major architectural refinements are required prior to global ICN deployment in the real world.     

基于无线网络的森林防火系统的研究与改进

论文针对现行的无线传感器技术方式的森林防火系统中的弊端,提出了一种改进的系统设计方案.改进后的方案主要采用二级Ad-Hoc模式的网络,对传统的无线传感器进行有效的改造的同时,也增加了稳定可靠的中心网络节点,无线通信网络采用改进后的AODV作为多跳路由协议,中心节点的数据处理采用卡尔曼滤波预处理,数据发送采用ALOHA机制进行随机延迟发送.系统经过反复实验,最终验证并总结出一套可以有效应用于实际工程中的系统部署方案.     

IPv6单播路由协议的新特性与应用研究

当前中小城市的下一代互联网建设比较迟缓,主要原因是对IPv6路由协议认识不足,缺少组网实践经验和工程技术指导。文中详细阐述了IPv6单播路由协议具备的新特性和工作机制,包括常用RIPng、OSPFv3、IPv6-IS-IS和BGP4+,使用思科仿真软件平台分别应用上述几种路由协议开展不同场景下的组网应用,设计了典型网络方案,给出了配置中的关键代码并分析了路由协议的运行状态和路由信息。仿真实验验证了IPv6单播路由协议的新特性,具有较好的工程技术实用价值,有助于促进现实IPv4网络向IPv6过渡的进程。     

Normalized Efficient Routing Protocol for WSN

WSNs （wireless sensor networks） consist of thousands of tiny nodes having the capability of sensing, computation, and wireless communications. Unfortunately these devices are limited energy devices, that is means we must save energy as much as possible, to increase network life time as long as possible. In this paper we introduce NEER--normalized energy efficient routing protocol that increases network life time through switching between AODV protocol that depends on request-reply routing, and MRPC that depends on residual battery in routing.     

基于3D Mesh结构的一种静态路由算法

3D NoC在同构多核系统中相比2D NoC具有更为优越的性能.本文在研究3D Mesh结构的基础上,对拓扑结构中的平均延时和理想吞吐量进行了理论上的评估,并提出了一种基于3D Mesh的新的静态路由算法,最后运用NS2网络仿真软件对其进行仿真和比较.实验结果显示,新的路由算法可以有效地提高吞吐量,并在大规模数据传输时...     

基于蚁群优化的AdHoc网络生存时间和其他网络性能平衡路由协议

本文提出了基于蚁群优化(ACO)算法的Ad Hoc网络生存时间和其他网络性能平衡路由协议(ABEAR)。协议按需发送人工蚂蚁进行路由发现,综合节点残留的信息素浓度、下一跳节点剩余能量、节点周围链路质量和拥塞情况选择下一跳节点来转发数据包,尽量避开信道使用频率较高的路径,减少了因信道冲突、数据包丢失和数据包重传所造成的能量损失,还缩短了网络传输时延,提高了网络吞吐量。协议还采用跨层机制根据MAC层通信活动情况,在保证网络连通性的前提下使部分空闲节点转入睡眠状态来节省能量消耗。仿真表明,与AODV协议相比,ABEAR协议在网络生存时间、数据包交付率和端到端平均时延方面均有较大改善。     

基于NS2的Ad Hoc网络AODV协议研究与改进

无线自组网是由一组无线移动主机组成的无基础设施的临时网络,在与其相关的网络协议的研究中常涉及到修改及扩展问题。文章分析了经典按需路由协议AODV的路由发现和建立过程,通过NS2仿真软件的内核扩展及重编译,在控制台输出相关的扩展内容,包括RREQ和RREP包的传送、正反向路由表的建立和节点路由表的更新等信息。结果表明,在NS2仿真软件下对无线自组网路由协议的研究和调试分析是一种科学有效的方法。最后对AODV协议本身提出了几种改进的思路和方法。     

粮情监测系统传感器网络的混合路由算法

无线粮情监测系统传感器节点的立体晶格结构提供了有效的位置信息,针对LEACH协议簇内单跳能耗不均衡的问题,提出了一种O(n)复杂度的混合路由算法,该算法以网络能耗均值为阈值确定多跳节点,根据网络能耗均值和最低转发能耗选择最佳转发节点。仿真实验表明该混和路由算法降低了能耗方差,延长了网络生存时间,适用于无线粮情监测系统。