文档介绍：编号:
审定成绩:
大学毕业设计(论文)
设计(论文)题目:
时间同步系统在TD-SCDMA
网络中应用的研究
学院名称:
学生姓名:
专业:
班级:
学号:
指导教师:
答辩组负责人:
填表时间:2012年 6月
教务处制
摘要
本文主要研究时间同步系统在TD-SCDMA(Time Division-Synchronous Code Division Multiple Access,时分同步码分多址)中的应用。作为数字化通信网的基础,同步网(work )是保证通信质量的关键因素。
TD-SCDMA基站的时间同步解决方案采用了我国自主知识产权的“北斗卫星”和分组网时间传递的方案来替代基站加装GPS,取得了较大进展。这需要在分组网络中使用IEEE1588v2技术,通过IEEE1588v2协议报文实现时间同步。而作为中国移动3G移动基站回传网络的主要解决方案,PTN替代GPS时钟传输的性能是被重点考量的关键指标之一。借助同步以太网1588v2技术,PTN可以实现高质量的网络同步,也可以解决移动3G基站回传中非常重要的时钟同步问题,同时省去了在基站安装GPS接收系统带来的限制。其中同步以太网可以实现PTN中的端到端频率传送,而1588v2采用主从时钟方案,对时间进行编码传送,利用网络链路的对称性和延时测量技术实现主从时钟的频率、相位和绝对时间的同步。
2010年中国移动分别在全国31个省/市/自治区的1个地市本地网中进行试点建设,并于2011年展开第二阶段时间同步建设,本文最后就时间同步设备及建设方案进行简单介绍。
【关键词】TD-SCDMA 北斗 IEEE1588v2 时间同步
ABSTRACT
This thesis mainly discusses the application of time synchronization system in the TD-SCDMA system. As a basis of work, the work is a key factor to munication quality.
The base station time synchronization solutions of TD-SCDMA system, adopting our own intellectual property "Bei Dou Navigation Satellite" and the work time-transferring program to replace the GPS installed on base stations, has made great progress. This method requires the IEEE1588v2 technology, which makes it possible to ensure the time synchronization of packets in be the major backhaul solutions for China Mobile's 3G mobile base stations, the transmission performance of PTN taking place of GPS clock is considered as one of the most significant the Synchronous technology 1588V2, PTN can achieves high-work synchronization and solve the very important problem of clock synchronization in the 3G mobile backhaul process in base stations as well as eliminate the limit brought by installing GPS receiver in base can achieve frequency transmission from peer to peer in the PTN, while the 1588v2 technology adopts the master-slave clock program to achieve time-coded transmission and the frequency, phase and absolute time synchronization of master- s