【作者】 何宁；

【导师】 禹农； 王学友；

【作者基本信息】 山东科技大学 ， 软件工程， 2004， 硕士

【摘要】 光纤通信是未来信息社会通信技术的支柱,基于IP over WDM技术的光传送网既充分利用了光纤巨大的带宽资源,又具有IP业务的灵活性,因而成为未来通信网络的发展趋势,国内外对这方面的研究方兴未艾。目前,实现全光网络还存在一定的困难,本文研究的是半透明的光传送网。光传送网有三种可能的解决方案:波长路由、光分组交换和光突发交换。光突发交换指的是将具有相同目的地址和一些相同属性的IP分组组装成一个突发,作为网络的一个基本转发单元,与波长路由和光分组交换相比,具有中间交换粒度,汲取了它们的优点,同时避免了它们的缺点,是光传送网最有竞争力的解决方案。本文对光突发交换网络的关键技术做了深入的研究,采用低优先级直接丢弃算法,结合突发分片技术和最近可用信道—空隙填充算法,提出了一种新的服务质量(QoS)解决方案,通过建立相应的光突发交换网络模型对该解决方案进行了仿真比较,仿真结果表明该方案可以明显的降低阻塞率,提高信道利用率,为各类业务提供良好的服务质量(QoS)保障。此外,本文还对传统的偏射路由算法进行了分析,针对其存在的缺陷详细提出了两种改进的偏射路由算法,重点研究了改进的偏射路由算法的实现机制,并对今后偏射路由算法的研究重点和发展趋势表达了作者的观点。更多还原

【Abstract】 Optical fiber communication will play an important role in the future society of information.The optical data network that is based upon the technology of IP over DWDM not only sufficiently uses huge band-width resource of optical fiber, but also has the flexibility of IP service. Hence it will become the tendency of future communication network. The study about it has been carrying out all around the world. Today there are sill some difficulties in realizing all optical network.So we are mostly studying the semitransparent optical transport networks nowadays. In optical transport networks, there are three possible solution of optical transport network: WR (Wavelength Routing), OPS (Optical Packet Switching) and OBS (Optical Burst Switching). OBS is refered to some technology where several IP packets with the same destination and some common attributes like quality of service (QoS) are assembled into a burst and are forwarded through the network as one entity. OBS is considered as the most promising solution of optical transport network because when compared with WR and OPS, it has a middle switching unit and combines their merit and avoid their their defect. This paper carries out some research on the offset-time-based QoS scheme, puts forward a new synthetic solution for supporting QoS based on the Burst Dropping Directly technique. This synthetic solution consists of the Burst Segmentation technique and Latest Available Unused Channel with Void Filling (LAUC-VF) scheduling algorithms. In order to evaluate the effectivity of the synthetic solution when it is applied to an optical burst switching network, an analyses model has been established. The results of simulation and performance evaluation have been shown that the new synthetic solution can be very efficient in QoS guarantee. In addition, the concept of normal deflection routing algorithm, mechanism for solving contention, and both benefits and limitations of the algorithm are discussed in this chapter. According to the disadvantage, various improved deflection routing algorithms are introduced and analyzed in detail. The analysis was focused on realization mechanism of these various algorithms and the improvement of network performance.更多还原