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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. 相似文献
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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。 相似文献
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IP/DWDM光因特网路由选择机制的研究 总被引:1,自引:0,他引:1
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. 相似文献
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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. 相似文献
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George Tsirakakis 《通讯和计算机》2014,(6):508-523
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. 相似文献
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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。 相似文献
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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。 相似文献
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Yu Hua Chanle Wu 《通讯和计算机》2005,2(5):75-81
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. 相似文献
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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。 相似文献
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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。 相似文献
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WeiWei Qing-JiZeng 《计算机科学技术学报》2004,19(6):0-0
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. 相似文献
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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。 相似文献