灵活光网络中的资源优化

发布时间：2018-01-20 05:51

本文关键词： 灵活光网络格式变换路由与资源分配多路径保护资源共享网络规划与优化　出处：《北京邮电大学》2014年博士论文　论文类型：学位论文

【摘要】：随着互联网技术的快速发展,业务速率越来越大,粒度越来越多样化,使用ITU标准固定栅格的传统波分复用网络逐渐不能满足日益增长的业务需求。具有弹性光通道的灵活光波分复用网络使用弹性光通道能够一定程度解决这些问题。与传统固定栅格光网络相比,灵活光网络中的路由与资源分配问题更加复杂。传统的路由与波长分配方法已无法完全解决灵活光网络的资源优化问题。本文针对灵活光网络中的资源优化问题,研究了考虑中间节点调制格式变换的路由与资源分配策略、多路径传输抗多故障资源优化策略、资源共享与多路径结合抗多故障策略等三个方面的相关技术。灵活光网络有效地提高了网络频谱利用效率,为未来网络架构开辟了新的前景。但频谱碎片及其导致的阻塞仍是灵活光网络中的瓶颈。本文提出了在中间节点进行调制格式变换的策略,该策略在中间节点设置共享的调制格式变换模块,通过动态路由、调制格式与频谱分配算法实现灵活光网络的资源优化。仿真结果表明,该策略可在不增加额外的带宽或改变现有业务的前提下,使得灵活光网络频谱利用效率提高了5%,阻塞率降低20%。在生存场景下,所提策略能够有效地提高业务故障恢复率,改善网络生存性。面对自然灾害等大规模故障的频发,光网络的抗多故障生存性已经成为一个研究热点。本文从灵活光网络中的抗多故障资源优化入手,引入多路径传输机制,对灵活光网络中的多路径传输策略进行了研究与分析。通过对其所需带宽进行数值计算,定量分析了其在抗多故障保护中与单路径传输相比的优势。建立了灵活光网络中的多路径传输整形线性规划(ILP)模型,并对模型进行了求解分析。仿真结果证明所提出的灵活光网络中抗多故障的多路径传输资源优化策略节约了网络资源,在保证传输性能的同时有效提高网络资源效率。灵活光网络中的资源共享已被证明能够有效地提高网络的资源效率。灵活光网络中的资源共享不仅是对波长或子波长等固定带宽资源,而是更灵活的频谱资源共享。本文针对灵活光网络中考虑资源共享的多路径抗多故障资源优化问题进行了研究,提出了充分考虑灵活光网络特点、多路径传输和资源共享优势的资源优化策略,并设计了基于改进的遗传算法来实现所提策略。算法通过对业务资源分配排序进行编码,使用两点交叉与赌盘算法,并进行有效的变异操作。仿真结果显示所提出的策略与算法能够有效提高网络资源效率,实现资源优化。
[Abstract]:With the rapid development of Internet technology, the business rate is increasing and the granularity is becoming more and more diversified. The traditional wavelength division multiplexing network using ITU standard fixed grid can not meet the increasing service demand gradually. Flexible optical wavelength division multiplexing network with elastic optical channel can solve these problems to a certain extent. Compared with traditional fixed grid optical network. The problem of routing and resource allocation in flexible optical networks is more complicated. The traditional routing and wavelength assignment methods can not completely solve the problem of resource optimization in flexible optical networks. This paper aims at the problem of resource optimization in flexible optical networks. . The related technologies of routing and resource allocation considering modulation format transformation of intermediate nodes, multi-path transmission anti-multi-fault resource optimization strategy, resource sharing and multi-path combination anti-multi-fault strategy are studied. Flexible optical network improves the efficiency of spectrum utilization effectively. It opens up a new prospect for the future network architecture. However, spectrum fragmentation and its resulting blocking are still the bottleneck in flexible optical networks. This paper proposes a strategy of modulation format transformation in intermediate nodes. A shared modulation format transform module is set in the middle node of the strategy. The dynamic routing, modulation format and spectrum allocation algorithm are used to optimize the resource of flexible optical network. The simulation results show that. Without adding additional bandwidth or changing existing services, this strategy can improve the spectral efficiency of flexible optical networks by 5% and reduce the blocking rate by 20%. The proposed strategy can effectively improve the service recovery rate and network survivability. In the face of the frequent occurrence of large-scale faults such as natural disasters, the survivability of optical networks has become a research hotspot. This paper starts with the optimization of anti-multi-fault resources in flexible optical networks, and introduces a multi-path transmission mechanism. The multipath transmission strategy in flexible optical networks is studied and analyzed, and the required bandwidth is calculated numerically. Compared with single path transmission, the advantages of ILP in multipath protection are quantitatively analyzed, and the ILP model of multipath transmission shaping linear programming in flexible optical network is established. The simulation results show that the multi-path transmission resource optimization strategy against multi-fault in flexible optical networks saves network resources. The network resource efficiency is improved effectively while ensuring the transmission performance. Resource sharing in flexible optical networks has been proved to be effective in improving resource efficiency. Resource sharing in flexible optical networks is not only fixed bandwidth resources such as wavelength or sub-wavelength. In this paper, the problem of multi-path anti-multi-fault resource optimization considering resource sharing in flexible optical networks is studied, and the characteristics of flexible optical networks are fully taken into account. Multi-path transmission and resource sharing advantages of the resource optimization strategy, and designed based on the improved genetic algorithm to achieve the proposed strategy. Using the algorithm of two points crossing and gambling, and carrying on the effective mutation operation, the simulation results show that the proposed strategy and algorithm can effectively improve the efficiency of network resources and realize resource optimization.
【学位授予单位】：北京邮电大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN929.1

【参考文献】