【作者】 陈浩；

【导师】 沈纲祥；

【作者基本信息】 苏州大学 ， 电子与通信工程（专业学位）， 2017， 硕士

【摘要】 未来5G接入网络中,密集部署无线小小区能提升移动网络的容量和覆盖率,可以满足用户对移动带宽的无限体验。这些小小区的高带宽依赖于高速回传网,面对越来越频繁的回传网构建,成本和可靠性已成为其急需考虑的两大性能指标。在本文中,采用时分和波分复用无源光网络(Time and Wavelength Division Multiplexed Passive Optical Network,TWDM-PON)的光接入技术,我们主要研究5G系统中回传网络的网络规划和成本优化设计。优化问题考虑了设备和部署成本,兼顾多个约束条件,包括每个光线路终端(OLT)能够接入的最大用户数和每个波长可接入的最大用户数。针对小基站(BS)大量离散随机分布的现状,提出了基于K-means聚类方法的网络规划和优化设计算法。同时,为了进一步降低深挖沟渠和铺设光纤的劳工成本,还提出了多级远程节点(RN)和光纤管道最大化共享策略。仿真结果表明,相比于传统的随机划分基站群的方式,本研究所提出的聚类方法可以大幅度地降低回传网络部署成本。另一方面,回传网络中任何一处故障或中断都将造成网络中断,大量数据丢失。因此,本文也展开了基于光纤-无线(Fiber-Wireless,FiWi)集成网络的生存性研究。提出了故障业务分流恢复机制,建立线性规划(Linear Programming,LP)模型,以保证用户最大可用带宽。研究结果表明,在不同故障下,相对于没有恢复机制方法的情形,本研究提出的恢复策略能有效地提高用户带宽的可用性。更多还原

【Abstract】 Dense deployment of small cells would be required to provide for high capacity and universal access for future fifth-generation(5G)mobile networks.However,it brings high challenges for cost-effective and reliable backhaul connectivity between these small cells.In this thesis,we consider the cost-minimized networking planning of a backhaul network for a 5G mobile system using Time and Wavelength Division Multiplexed Passive Optical Networks(TWDM-PONs)technology.For this,equipment and deployment cost are considered,and the design constraints such as the maximum number of subscribers per optical line terminal(OLT)and the maximum number of subscribers per wavelength are incorporated.Considering the fact that many small cell base stations are randomly dispersed over a wide region,a K-means clustering-based algorithm is proposed for the optimal solution.The strategies of using multi-stage remote nodes and cable conduit sharing are further applied to reduce the labor cost for trenching and laying fibers.Our simulation results show that the proposed approaches can substantially reduce the backhauling cost in comparison with the traditional intuitive random-cut sectoring approach.On the other hand,any component failure or interruption in the backhaul networks will cause huge data loss,among which fiber cut is the main cause.Thus,in this thesis we also consider the survivability of Fiber-Wireless(FiWi)integrated networks.We propose a flowsplitting restoration strategy and based on this,develop a Linear Programming(LP)optimization model to maximize mobile user bandwidth availability.Simulations under different failure scenarios show that the proposed strategy is effective to enhance the mobile user access bandwidth.更多还原