Design And Simulated Implementation Of Protection Algorithms With Connection Availability In Survivable Fiber-Wireless (FiWi) Access Network

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.