智能光网络中的管控技术与资源优化问题研究

【作者】 郭秉礼；

【导师】 顾畹仪；

【作者基本信息】 北京邮电大学 ， 电磁场与微波技术， 2011， 博士

【摘要】 智能光网络作为下一代光传送网发展的主要方向,其业务提供与网络管控过程的智能性、动态性不仅满足了电信业务迅猛增长的带宽需求,而且契合了数据业务的突发特征。同时,随着电信业务的进一步演进,以及网络智能化向网络边缘和业务层延伸的全网智能化趋势,推动了光网络由技术驱动型向业务驱动型网络的转变,进而对现有智能光网络在业务提供智能化、差异化,管控技术的灵活性、动态性等方面提出挑战。其中,网络管控技术与资源优化技术作为智能光网络中的两项支撑性技术,得到了业界的广泛关注。在多项国家项目与企业合作项目的支持下,作者对智能光网络中的业务提供、联合路由、可生存映射以及系统容错等技术做了大量调查研究、理论创新、仿真实验和设计开发工作,形成了一些创新性成果。本博士学位论文主要工作和创新点包括以下几个方面：1、针对具有复杂业务逻辑、严格QoS要求的电信级业务的支撑技术,提出了基于管控协同机制的业务提供框架。该框架依赖于管理和控制平面的信息交互、功能协作,并结合了基于策略的网管系统和移动代理(用于支持基于策略网管的实现和实现分布式网管智能)的实现,能够实现有端到端物理约束的智能业务提供和实时动态的业务管理,达到了资源优化利用的目的。2、本论文研究了多域光网络中的端到端资源预留问题,通过揭示原有串行信令在大规模分域网络中的适用性问题,提出了基于并行快速消息分发机制的P-RSVP (Parallel RSVP)协议,通过仿真验证了P-RSVP在跨域LSP的端到端资源预留中的有效性。一方面,P-RSVP大幅度降低了LSP端到端资源预留的时延；另一方面,显著缩短了资源可用性信息收集过程与预留过程的时间间隔,进而避免了不同LSP预留过程导致的资源冲突,提高了资源的可用性。3、对IP over WDM网络中的业务端到端时延问题进行研究,特别针对业务需要二次汇聚时,由于路由器侧排队造成的业务时延问题,创新性地提出了考虑节点负载的联合路由算法—LBA (Load Balanced Algorithm),通过仿真分析可知,算法有效地实现了全网的业务均衡,进而缩短了业务的端到端时延,同时降低了全网的业务阻塞率。4、在IP over WDM网络中,创新性地提出了动态网络下的可生存映射问题,并设计了包含动态路由(DR)和逻辑拓扑重映射(RILT)两个策略的在线算法,以尽量减少可重构的逻辑拓扑中的危险割集,从而提高了故障情况下逻辑拓扑的连通性,最大限度地使受损业务在IP层恢复。为IP over WDM网络中动态业务下,基于IP层的业务恢复设计提供了参考。5、在分布式计算业务部署中,IT资源与网络资源需要联合分配的背景下,分析系统级容错策略实施的具体要求,提出了基于认知机理的异构资源统一控制框架。并针对现有单功能节点(IT资源)故障下的容错机制研究中存在的问题,结合虚拟化资源的动态迁移技术,提出了FD-EVN (Failure Dependent-Enhanced Virtual Network)的实现方案,并通过大量的仿真证明了所提算法的有效性。与现有的容错机制相比,FD-EVN大大节省了冗余资源的消耗,提高了网络资源和IT资源的使用效率,改善了业务接纳率、映射代价等网络性能。更多还原

【Abstract】 Intelligent Optical Network (ION) is considered to be the future of the next generation optical transportation network, the intelligence and dynamic in service provisioning and network management/control approach not only meets the increasing bandwidth demand of data service telecommunication service, but tackle the bursty of data traffic. At the same time, the evoluation of telecommunication service and the trend of intelligence of whole network including the service layer and edge of the network, stimulate the change of network from technology-driven to service-driven. Furthermore, it poses a challenge to intelligentization、scalability、differentiation of service provisioning, and scalability、dynamicity of network management/control technology. Within the context of this, the network management/control approach and resource optimization strategy draw a lot of attention from the industry as crucial technologies of ION.Under the support of several national grants and funding from industry area, service provision problem、integrated routing、survivable mapping and systematic fault tolerance strategy of ION are investigated in this paper, including the related work、theory extension、simulation development and so on, and some positive results are presented. The major results of this paper including:1. Regarding to the novel telecommunication service (with complex service logic and crucial QoS requirements) provisioning approach, we propose a service provision framework which depends on the interaction and coordination of management and control plane, also the implementation of policy based management and mobile agent. It could facilitate the end to end service provision with physical constraints and dynamic service management, with the purpose of resource optimization.2. We investigate the end to end resource reservation problem through revealling the challenge of previous serial signaling process in multi-domain optical network, and propose fast parallel signaling distributing mechanism——P-RSVP. The simulation results demonstrate the time efficiency of resource reservation in multi-domain LSP establishment. Besides, P-RSVP tries to avoid the resource collision between different LSP reservation approach through reducing the delay between information collection of resource avability and reservation action, and finally improve the resource avability. 3. We investigate the end to end traffic transmission delay problem in IP over WDM network, and especially for the traffic traversing more than one logical link, the queuing delay in router side plays a important rule in the traffic end to end delay. We propose an integrated routing algorithm with load balancing consideration—LBA (Load Balanced Algorithm). The simulation results show that load balancing is achieved in the whole network and the end to end delay of traffic is reduce, as well as the traffic blocking probability.4. In IP over WDM network, we arise the dynamic survivable mapping problem at first, and employ DR (Dynamic Routing) and RILT (Remapping of Instant Logical Topology) strategy for an on-line algorithm in order to remove the critical cutset in reconfigurable logical topology and improve the connectivity of logical topology under single physical link failure, so that, the affected traffic could be restored in a maximum way. The results in this paper could provide suggestion for IP layer restoration design in IP over WDM with dynamic traffic.5. In distributed computing service provisioning, IT resource and network resource should be allocated jointly. Through analyzing the systematic fault tolerance strategy requirements in practical network, we propose a heterogeneous resource control framework based on cognition theory. Also, after examining the existing problem in previous single facility node (IT resource) failure tolerace strategy, we propose the FD-EVN (Failure Dependent-Enhanced Virtual Network) based on the live migration in resource virtualization. Comparing with the previous fault tolerace strategy, FD-EVN reduces the redundancy needed to guarantee the VN to survive from single facilty node failure and improve the resource efficiency. Furthermore, the service acceptance ratio is improved and the mapping cost of VN is reduced.更多还原