Dynamic Fuzzy Controlled RWA Algorithm for IP/GMPLS over WDM Networks

This paper proposes a dynamic RWA scheme using fuzzy logic control on IP/GMPLS over WDM networks to achieve the best quality of network transmission. The proposed algorithm dynamically allocates network resources and reserves partial bandwidth based on the current network status, which includes the request bandwidth, average utilization for each wavelength and its coefficient of variance (C.V.) of data traffic, to determine whether the connection can be set up. Five fuzzy sets for request bandwidth, average rate and C.V. of data traffic are used to divide the variable space: very large (LP), large (SP), normal (ZE), small (SN), and very small (LN). Setting the fuzzy limit is a key part in the proposed algorithm. The simulation of scenarios in this paper has two steps. In the first step, the adaptive fuzzy limits are evaluated based on average transmission cost pertaining to ten network statuses. The second step is to compare the proposed algorithm with periodic measurement of traffic (PMT) in ATM networks in six network situations to show that the proposed FC-RWA algorithm can provide better network transmission.     

网络的IP化趋势及其挑战与对策

网络的IP化是其发展的趋势,同时又面临着三大挑战：IP骨干网交换速度太慢造成网络瓶颈;IP网络不能提供适合运营要求的服务质量（QoS）;IP网络的可生存性（Survivability）问题。文章对以上三个问题进行了综述,着重阐述了解决挑战的方法与设想,并进一步给出了研究与发展的方向。最后对IP网络的发展与挑战进行了展望。     

IP／DWDM光因特网路由选择机制的研究

The requirements of IP/DWDM optical Internet routing are analyzed. Guaranteeing QoS, survivability and last routing, and supporting multicast and making lull use of the resources of network are the basic requirements for it. Point out that QoS and survivability are the most important two keys to optical Internet routing. Summarize the common implementations which are used to satisfy these requirements. At last, point out the further steps that should be taken.     

GMPLS网络中多约束QoS路由的预计算方法

GMPLS(generalized multiprotocol label SWitching)网络中的多约束QoS路由问题是要在诸如带宽、代价和延迟的约束条件下找到一条优化的路径.这个问题通常被认为是一个NP-完全问题.在研究共享风险链路组具有的启发信息的基础上,提出了一种具有共享风险链路启发信息的多约束预计算算法.该算法包含预计算和搜索两个部分.预计算主要是能创建和更新每个节点上的路由表.而后,搜索部分则可以在层次化的结构中选择满足约束条件的优化的路径.大量仿真数据表明,相应的方法能够取得满意的结果,可以有效地解决GMPLS网络中多约束的QoS路由问题.     

高强度电磁脉冲下IP光网络生存性协调机制

讨论了在电磁战中大量网络设备遭到物理破坏的情况下,如何利用多层生存性协调机制来提供网络的生存性。并针对对等模型的IP-over-Optical多层网络,提出了一种基于GMPLS的集成生存性协调策略——MCBL,以实现多层网络生存性机制之间的迅速协调,其性能与其他多层生存性协调策略相比有明显的提高。     

IP/WDM网络的虚拓扑设计

为解决IP网络与光网络融合过程中虚拓扑设计的问题,提出基于短光路优先建立的IP/WDM网络动态虚拓扑配置方法。该方法通过引入光通道跳距限制,避免长光路对资源的浪费,达到缩短光通道长度和增强光层建路能力的目的。仿真结果表明,利用该机制配置的虚拓扑进行业务梳理,能够在较宽的负载范围内降低网络阻塞率,提高业务梳理效率。     

Fault Recovery in Carrier Ethernet,Optical and GMPLS Networks

The trend in the current multiple technology network environment is to reduce the number of network technology layers and form a dual layer, packet over circuit architecture. Carrier Ethernet （for the packet layer）, optical networks （for the circuit layer） and GMPLS, are dominant enablers in this scenario. Survivability and robustness will be of critical role for the accomplishment of a transport class of network. This paper describes the fault recovery functionalities in optical, Carrier Ethernet and GMPLS networks, considering the role of GMPLS in each scenario. We overview the currently standardized schemes and published research, evaluate different cases and comment on unresolved issues and required extensions.     

基于移动IP实现可靠组播的一种优化策略

移动IP(MIP)组播技术是移动IP技术和IP组播技术的结合,有着广泛的发展空间。该文对现有的可靠移动组播协议进行了研究,分析了各种协议无法满足复杂的实际应用的状况,然后针对该问题提出了基于移动节点的切换频率进行控制的一种优化策略,并且给出了基于该策略改进RRBMoM协议的算法。     

一种主动网络技术——ActiveIP选项

主动网络是一种新型的网络结构,它允许用户在网络节点插入自定义的程序,可对通过网络的用户数据进行计算。分析了IP数据报的格式,扩展了IP数据报选项域的定义,在其中嵌入程序,使得在Internet上可以采用主动网络技术。随着IP数据报在Internet的传输,可在Internet中实现动态计算并且快速扩展网络服务。     

一种使用TCP/IP协议实现无线传感器网络互连的新型设计

传统的TCP/IP协议栈由于规模庞大而不能用于资源有限的无线传感器网络,在分析无线传感器网络环境的基础上,研究针对无线传感器节点的TCP/IP协议栈的设计,引入协议的头标压缩技术,提出一种采用两种节点、两种栈设计的新型模型.模型中除普通节点外附加了少量的超级节点,普通节点采用压缩TCP/IP协议,超级节点实现压缩和标准TCP/IP协议之间的转换,并保证每一个节点与外部Internet高效无缝的连接.     

高强度电磁脉冲影响下基于GMPLS的网络生存性

讨论了在电磁战中大量网络设备遭到物理破坏的情况下,如何利用GMPLS机制来提供网络的生存性。并对GMPLS机制提供的生存性能力与现有生存性机制进行了比较,最后介绍了适合电磁战应用的几种多层生存性协调策略并提出了一种动态生存性LSP的算法设计思路。     

一种可靠双盲的IP时间隐通道

针对现有的IP时间隐通道需要事前约定IP数据包的时间间隔与传输信息之间的编码方案,不能在收发过程中根据网络的传输质量进行双盲动态调整的问题,提出了一种IP时间隐通道编码方案的双盲动态调整策略。该策略通过细分网络环境,并针对不同网络环境动态选择预设的编码方案,实现了收发双方间编码方案的双盲动态调整。为了验证策略的可靠性,实现了这种可靠双盲的IP时间隐通道。实验结果表明,该策略能够较好地实现收发双方间的双盲动态调整。     

Framework and Algorithm for Grid QoS Infrastructure in Optical Burst Switching Networks with GMPLS Support

Recently, in order to satisfy the requirements of all kinds of high-performance computing and transmission applications, researchers begin to focus on grid technology and have made lots of research work. Among the corresponding aspects, a complete and feasible grid framework is rather pivotal to provide nontrivial QoS guarantee in this grid architecture, which should include Grid application layer, Grid middleware layer, and network layer, even the concrete resources. In this paper, a novel architecture for Grid QoS infrastructure is proposed based on other architectures suggested by Globus project, Global Grid forum and IETF. The architecture is complete and consists of three QoS layers from top to bottom including Grid application, middleware and network layer. In addition, the algorithm based on advance resource reservation is also provided and described in optical burst switching （OBS） networks with GMPLS（Generalized Multi-Protocol Label Switching） support. The algorithm with pruned topology and shared risk links group constraints is designed for supporting the realization of routing function in the architecture. Extensive simulations with dynamic traffic are made to prove the validity and properness.     

IP网上稳定可靠的视频流系统设计与实现

流媒体技术是近几年来Internet发展的产物，并已成为Internet上最令人关注的问题之一。随着流媒体技术的不断完善和发展，基于流媒体技术实现的视频流系统的稳定和可靠性已显得越来越重要。文章主要对以流媒体技术为基础的网络视频流系统作出描述并分析其特点，最后提出在IP网上实现稳定可靠的视频流系统的设计方案。     

IP网络生存性研究综述

随着交互式应用和各种实时业务的增长对网络生存性要求的提高,IP网络的生存性研究受到了越来越多的关注。本文首先对IP网络生存性面临的问题以及影响因素作了概括,并且对目前有关纯IP网络生存性、MPLS网络生存性、IP网络与底层的生存性协调研究作了归纳总结,尤其对纯IP网络的生存性研究现状从多方面进行了比较详细的介绍,最后指出IP网络的快速重路由机制具有很好的实际应用潜力,保护恢复能力和服务质量在MPLS网络中的结合、动态多层保护则是未来IP骨干网生存性维护的发展方向。     

层叠IP/WDM网络中的区分服务

为层叠IP/WDM网络提出基于光通路物理跳距评估的区分服务机制。在使用层叠模型的IP/WDM网络体系中,如IP/MPLS层不了解光通路的物理跳距,现有文献中以此信息为基础的区分服务策略即不再适用。采用光通路区分策略评估光通路的物理跳距,映射为连接消耗的波长资源量,使用QoS接入控制机制拒绝占用大量资源的低优先级连接请求。仿真结果表明,该机制能够为不同等级业务提供良好的区分服务。     

GMPLS中SDH标记管理的实现

ASON(自动交换光网络)是光传输网的一个趋势,为了解决基于SDH(同步数字序列)的ASON项目中的时隙资源管理问题,对ASON概念、SDH复用结构与过程以及GMPLS、RSVP协议和相关光通信标准进行了研究,并在标准规定的基础上提出自己的SDH标记设计思想、数据结构描述、管理原则及其实现方法,既能有效地管理SDH时隙分配和回收,也可以灵活地满足实际应用中客户各种不同容量的业务要求。     

Integrated differentiated survivability in IP over WDM networks

The problem of differentiated Multi-Layer Integrated Survivability (MLIS) in IP over WDM networks is studied, which is decomposed into three sub-problems: survivable strategies design (SSD), spare capacity dimensioning (SCD), and dynamic survivable routing (DSR). A related work of network survivability in IP over WDM networks is firstly provided, and adaptive survivable strategies are also designed. A new Integrated Shared Pool (ISP) approach for SCD is then proposed, which is formulated by using integer-programming theory.Moreover, a novel survivable routing scheme called Differentiated Integrated Survivability Algorithm (DISA) for DSR is developed. Simulation results show that the proposed integrated survivability scheme performs much better than other solutions (e.g., “highest layer recovery” and “lowest layer recovery” schemes) in terms of traffic blocking ratio, spare resource requirement, and average traffic recovery ratio in IP over WDM networks.     

在ATM网上运行IP的多种方案

文章对在IP与ATM结合的多种方案,即经典的IP over ATM、MARS、局域网仿真、NHRP、MPOA及第三层交换进行了描述,并同时指出其中值得注意的一些问题。     

铁路上海站Intranet网中透明移动IP的实现方法

提出了一种基于网络代理的解决方案．具有代理ＡＲＰ和ＩＰ隧道等功能。为避免出现三角状路由，还进一步研究了透明移动ＩＰ的路由优化策略。试验的结果证明本方案在功能和性能上都不失为一种能够满足网络中日益增长的移动需求的简单而有效的方法。