Design of a Two layer Scalable Wavelength Routing Optical Interconnection Network

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｈｉｇｈｐｅｒｆｏｒｍａｎｃｅｐａｒａｌｌｅｌｃｏｍｐｕｔｉｎｇｐｌａｔｆｏｒｍｍａｄｅｕｐｏｆｗｏｒｋｓｔａｔｉｏｎｓｏｒｐｅｒｓｏｎａｌｃｏｍｐｕｔｅｒｓｉｎｔｅｒｃｏｎｎｅｃｔｅｄｂｙｎｅｔｗｏｒｋｈａｓｂｅｃｏｍｅｔｈｅｍａｉｎｄｅｖｅｌｏｐｍｅｎｔｓｔｒｅａｍｏｆｐａｒａｌｌｅｌｃｏｍｐｕｔｉｎｇｔｅｃｈｎｏｌｏｇｉｅｓ［１,２］．Ｗｉｔｈｔｈｅｅｎｈａｎｃｅｍｅｎｔｏｆｎｏｄｅｃｏｍｐｕｔｅｒｐｒｏｃｅｓｓｉｎｇｃａｐａｂｉｌｉｔｉｅｓ,ｉｔｂｅｃｏｍ…     

P2P文件传输中网络资源搜索策略改进

资源搜索和共享是P2P网络中重要的应用,进行高效资源的查询是提高系统效率、增强系统可扩展性的重要的技术问题.介绍了对等网络的基本特征和一些主要改进查询策略,同时分析了这些策略存在的问题,并在此基础上提出了一种基于资源路由表的缓存策略,最后对此方法进行模拟仿真,证明该策略可以有效地提高非结构化文件传输系统的效率及可扩展性.     

无线传感器网络路由协议与改进

详细介绍无线传感器网（WSN）两种代表性协议：信息协商传感器（SPIN）协议和低能量自适应分簇路由（LEACH）协议的概念、原理和优缺点。提出路由协议中需要进一步解决的问题。改进的WSN路由算法应尽可能降低节点能耗,以延长网络生存时间。     

QoS routing based on mobile agent for LEO satellite IP networks

Current quality of service (QoS) routing schemes for low earth orbit (LEO) satellites IP networks either neglect the varying population density or fail to guarantee end-to-end delay. As a remedy, QoS routing protocol based on mobile agent (QoSRP-MA) is proposed. QoSRP-MA is a source-based routing protocol. Once connection requests arrive, QoS mobile agents are dispatched from ingress satellite to explore routes, which migrate using satellite routing tables. Upon arriving in egress satellite, QoS mobile agents migrate back towards ingress satellite to reserve bandwidth. To construct satellite routing tables, load balancing routing algorithm based on mobile agent (LBRA-MA) is presented. In LBRP-MA, at regular intervals mobile agents launched on all satellites migrate autonomously to evaluate path cost and update routing tables. Moreover, path cost between source and destination is evaluated considering satellite geographical position as well as inter-satellite link (ISL) cost. Furthermore, ISL congestion index is considered to update routing table. Through simulations on a Courier-like constellation, it shows that QoSRP-MA can achieve guaranteed end-to-end delay bound with higher throughput, lower connection failing ratio and signaling overhead compared to high performance satellite routing (HPSR) scheme.     

网络中心战下的雷达自组网技术

现有雷达组网从数据的角度实现雷达的组网,并没有实现雷达网络的组网。文中提出的雷达自组网机制实现了雷达网络的真正组网。在这种机制中,雷达可以自发地与其他相邻雷达进行通信,协同完成数据融合等功能,并能自主地寻找转发路径,将有效数据返回到指挥中心。通过对两种组网机制的定量分析,雷达自组网在数据冗余和通信距离方面具有一定的优势。     

RPB-MD: Providing robust message dissemination for vehicular ad hoc networks

To improve traffic safety and efficiency, it is vital to reliably send traffic-related messages to vehicles in the targeted region in vehicular ad hoc networks (VANETs). In this paper, we propose a novel scheme, relative position based message dissemination (RPB-MD), to reliably and efficiently disseminate messages to the vehicles in the zone-of-relevance. Firstly, the relative position based (RPB) addressing model is proposed to effectively define the intended receivers in the zone-of-relevance. To ensure high message delivery ratio and low delivery delay, directional greedy broadcast routing (DGBR) is introduced to make a group of candidate nodes hold the message for high reliability. Moreover, to guarantee efficiency, the protocol time parameters are designed adaptively according to the message attributes and local vehicular traffic density. The protocol feasibility is analyzed to illustrate the robustness and reliability of RPB-MD. Simulation results show that RPB-MD, compared with representative existing schemes, achieves high delivery ratio, limited overhead, reasonable delay and high network reachability under different vehicular traffic density and data sending rate.     

基于业务的光接入网路由选择算法

光接入网有着不同于光骨干网的特点和问题,不能直接套用光骨干网的路由选择算法。提出了一种基于业务的光接入网的路由选择算法。其思想是根据业务类型和重要性构建不同的带权图模型,每一种模型采用相应的子算法,使整体资源得到合理配置。实践证明,该算法能够改善网络的传输质量。     

DFR: an efficient directional flooding‐based routing protocol in underwater sensor networks

Unlike terrestrial sensor networks, underwater sensor networks (UWSNs) have salient features such as a long propagation delay, narrow bandwidth, and high packet loss over links. Hence, path setup‐based routing protocols proposed for terrestrial sensor networks are not applicable because a large latency of the path establishment is observed, and packet delivery is not reliable in UWSNs. Even though routing protocols such as VBF (vector based forwarding) and HHVBF (hop‐by‐hop VBF) were introduced for UWSNs, their performance in terms of reliability deteriorates at high packet loss. In this paper, we therefore propose a directional flooding‐based routing protocol, called DFR, in order to achieve reliable packet delivery. DFR performs a so‐called controlled flooding, where DFR changes the number of nodes which participate in forwarding a packet according to their link quality. When a forwarding node has poor link quality to its neighbor nodes geographically advancing toward the sink, DFR allows more nodes to participate in forwarding the packet. Otherwise, a few nodes are enough to forward the packet reliably. In addition, we identify two types of void problems which can occur during the controlled flooding and introduce their corresponding solutions. Our simulation study using ns‐2 simulator proves that DFR is more suitable for UWSNs, especially when links are prone to packet loss. Copyright © 2011 John Wiley & Sons, Ltd.     

基于广义对数函数的统一路由策略

通过对最短路径路由策略、有效路由策略、最小信息路径路由策略的算法以及广义对数函数进行研究发现：将广义对数函数内的变量进行部分修改可实现以上三种算法的统一,并且通过对此种统一算法进行改进并且仿真发现,在此统一算法变量连续变化的同时,某些路由策略在复杂网络中的表现同样具有连续性。这表明此种算法可以将以上三种路由策略进行完美的统一。     

基于OpenFlow网络的流媒体传输QoS的研究与设计

Open Flow是软件定义网络(Software Definded Network,SDN)的产物,是一种新型的网络结构,且发展十分迅速。但Open Flow网络的Qo S功能仍待优化,针对于Open Flow网络中流媒体传输Qo S的不足,在现有网络Qo S模式基础上提出了Open Qo S,它应用于Open Flow网络的控制器上,采用动态路由的方式,使得流媒体在网络端到端传输时,能够根据网络状况,动态改变路由路径,进而提高网络Qo S。最后,通过一个小的拓扑网络对本研究进行了试验验证。