【作者】 李冰；

【导师】 郭磊；

【作者基本信息】 东北大学 ， 电子与通信工程（专业学位）， 2014， 硕士

【摘要】 近年来,全球范围内地震、海啸等自然灾害频发为抗毁通信基础设施建设提出严峻挑战。通信网络一旦发生故障不仅导致用户和运营商的极大经济损失,更制约着灾难营救效率。如何提高网络生存能力、保障业务连续性成为学术界和工业界共同关注的焦点。作为极具前景的宽带接入技术之一,光纤-无线(Fiber-Wireless, FiWi)融合接入网不仅集成了光纤接入网容量大、可靠性强和无线接入网成本低、灵活性好等技术优势,其潜在的业务倒换能力更为下一代可生存接入网设计提供了研究契机。因此,可生存FiWi接入网中保护机制的研究对于建设新一代抗毁通信基础设施具有重要的理论价值和现实意义。本文聚焦可生存FiWi接入网中保护机制研究,针对以往研究中普遍存在的网络生存性评估方法片面、资源利用率低、网络规划和运营场景考虑不充分等典型问题,提出连接可用性保护方法,目的是为可生存FiWi接入网未来的建设与发展提供必要的理论指导和技术参考。首先,针对“补充型”网络规划(Supplementary planning)方案中前端无线网络与后端光网络归属不同运营商且资源分配相互独立的应用场景,分别提出面向光连接和无线连接的局部连接可用性模型,在此基础上进一步提出局部连接可用性分段保护算法(Segment Protection algorithm with Local Connection Availability, SPLCA),通过为业务的光连接和无线连接进行资源优化分配,在满足区分连接可用性要求和业务带宽需求的情况下,最小化FiWi接入网的带宽容量消耗。然后,针对“新建型”网络规划(Greenfield planning)方案中前端无线网络与后端光网络归属同一运营商并且可实现资源统一调度的应用场景,提出联合无线-光的全局连接可用性模型,在此基础上提出全局连接可用性通路保护算法(Path Protection algorithm with Global Connection Availability, PPGCA),以最小化服务运营商的带宽容量成本为目标,通过无线网络资源与光网络资源的联合优化分配,保证业务的区分连接可用性及带宽要求。本文通过VC++ 6.0软件搭建仿真平台,对所设计的算法进行了性能评估,并与以往研究中保护方法进行了比较分析。结果表明,文中提出的SPLCA和PPGCA算法在降低网络资源消耗、改善资源利用率、节省带宽容量成本方面具有显著优势。更多还原

【Abstract】 In recent years, the world-wide disasters such as earthquake and tsunami occur frequently, which imposes more servere challenges on the development of disaster-resilent communication infrastructures. The failures in communication network not only lead to huge economic loss but also restrict the efficiency of disaster rescue. How to enhance the network disaster-resilence and guarantee the service continuity has become one of the focuses in the academic and industrial communities. As one of the promising broadband access tecnonologies, Fiber-Wireless (FiWi) access network integrates the tecnnological merits of larger bandwidth capacity and better reliability from optical access network with that of lower deployment cost and better flexibility from wireless access network. More importantly, the ability of traffic switching inherent in FiWi access network provides the research opportunity for the design of next generation survivable access networks. Therefore, the research of protection scheme in survivable FiWi access network takes theoretical and realistic significance for the development of next generation disaster-resilent communication infrastructures.This thesis focuses on the research of protection scheme in survivable FiWi access network. We propose the protection algorithms with connection availability to solve the challenges in previous works including the limitation in survivability estimation, underutilization of network resource and the insufficient consideration about network planning and operation. Our objective is to provide the necessary theoretical guidelines and technological references for the development of survivable FiWi access network in future. For the scenario of supplementary planning, where the wireless network at front-end and the optical network at back-end are administrated by different operators and they are independent in resource allocation, we propose the local connection availability models for the wireless connection and optical connection, respectively. Based on this model, we further propose the Segment Protection algorithm with Local Connection Availability (SPLCA). In SPLCA, we deal with the optimized allocation of bandwidth resource for optical and wireless connections. Our objective is to minimize the resource consumption while guaranteeing the differentiated connection availability requirements and bandwidth demands. For the scenario of greenfield planning, where the wireless network at front-end and the optical network at back-end are administrated by the same operator and the networkresource can be scheduled uniformly, we propose the global connection availability with joint wireless and optical resource. Then, we further propose the Path Protection algorithm with Global Connection Availability (PPGCA). In PPGCA, we optimize the joint allocation of wireless and optical bandwidth resources. With the constraints of differentiated connection availability requirements and bandwidth demands, the objective of PPGCA is to minimize the cost of bandwidth capacity over the whole network.The VC++ 6.0 software is employed to develop the simulation platform in order to evaluate the performance of proposed algorithms. A comparative analysis is made between the proposed algorithms and the previous approaches. Simulation results demonstrate that the proposed SPLCA and PPGCA algorithms gain the obvious advantages in reducing the resource consumption, improving resource utilization and saving the cost of bandwidth capacity.更多还原