固定栅格与灵活栅格混合网络中的路由与频谱分配策略研究

发布时间：2018-10-31 19:57

【摘要】：近年来,由于视频点播,云计算等带宽密集型业务不断发展,网络业务量呈现爆炸式增长。传统波分复用(WDM)网络按照国际电联(ITU-T)规定的固定栅格分配频谱资源,缺乏灵活性,严重浪费频谱资源,不能够满足未来光网络传输需求。灵活栅格技术使用更小的频谱粒度进行资源划分,可以支持千兆比特的子波长业务,也可通过频谱组合传送100Gbps以上的高速超波长通道业务,是未来光网路传输技术中最具前景的。从固定栅格光网络向灵活栅格光网络升级的策略,越来越受到人们的关注。本文主要研究从固定栅格光网络到灵活栅格光网络逐步升级过程中的升级策略,以及在固定栅格与灵活栅格并存的混合网络中的路由与频谱分配算法(RSA)。首先针对升级过程中的混合节点,提出了满足颜色无关性,方向无关性和竞争无关性的节点结构模型。然后,针对网络如何升级的问题,提出基于瓶颈链路优先的升级策略和基于节点的升级策略。其中,基于瓶颈链路的策略包括链路密度策略和拥塞链路策略,基于节点的策略包括节点度数策略和节点总业务量策略,并且提出了每种升级策略的RSA算法。最后,通过C语言对两种策略及其RSA算法进行仿真,结果表明,每种升级策略都能够有效的降低网络带宽阻塞率(BBR)。在基于瓶颈链路的升级策略中,多数情况下拥塞链路策略BBR表现优于链路密度策略,但随着链路密度阈值选取越低,两种策略的BBR表现越接近。在基于节点的升级策略中,节点度数策略是一种静态策略,节点总业务量策略是一种动态策略(其BBR性能与选取升级节点的个数有关),数值结果表明升级2个节点的总业务量策略BBR性能与节点度数策略的相当。
[Abstract]:In recent years, due to the continuous development of bandwidth intensive services such as VOD, cloud computing, network traffic has explosive growth. Traditional wavelength division multiplexing (WDM) networks allocate spectrum resources according to the fixed grid provided by ITU-T, which is lack of flexibility and waste spectrum resources seriously, and can not meet the transmission needs of optical networks in the future. Flexible grid technology uses smaller spectrum granularity to partition resources, which can support sub-wavelength services of gigabit, or transmit high-speed super-wavelength channel services above 100Gbps through spectrum combination. It is the most promising optical network transmission technology in the future. People pay more and more attention to the strategy of upgrading fixed grid optical network to flexible grid optical network. This paper mainly studies the upgrading strategy in the process of upgrading from fixed grid optical network to flexible grid optical network, and the routing and spectrum allocation algorithm (RSA). In hybrid network with fixed grid and flexible grid. Firstly, for the mixed nodes in the upgrade process, a node structure model is proposed to satisfy the color independence, direction independence and competition independence. Then, aiming at the problem of how to upgrade the network, a bottleneck link-first upgrade strategy and a node-based upgrade strategy are proposed. Among them, the strategy based on bottleneck link includes link density policy and congestion link strategy, the strategy based on node includes node degree policy and node total traffic strategy, and the RSA algorithm for each upgrade strategy is proposed. Finally, two strategies and their RSA algorithms are simulated by C language. The results show that each upgrade strategy can effectively reduce the network bandwidth blocking rate (BBR). In the upgrade strategy based on bottleneck link, the BBR performance of congestion link strategy is better than the link density strategy in most cases, but with the lower the link density threshold, the BBR performance of the two strategies is closer. In the node-based upgrade strategy, the node degree strategy is a static strategy, and the node total traffic strategy is a dynamic strategy (its BBR performance is related to the number of upgrade nodes). The numerical results show that the total traffic policy BBR performance of the two nodes is comparable to that of the node degree strategy.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.1

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