毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： TD-SCDMA与WCMA网络优化分析 3G network optimization 学生姓名： 学号： 专业： 通信工程 所在学院： 龙蟠学院 指导教师： 职称： 讲师 2011年 12 月 1 日说明：要求学生结合毕业设计（论文）课题参阅一篇以上的外文资料，并翻译至少一万印刷符（或译出3千汉字）以上的译文。译文原则上要求打印（如手写，一律用400字方格稿纸书写），连同学校提供的统一封面及英文原文装订，于毕业设计（论文）工作开始后2周内完成，作为成绩考核的一部分。3G network optimization摘自TD-SCDMA无线网络优化原理及方法One, the basic process of 3G network optimizationOperators aim is to build a profitable network, they are very concerned about the network construction, expansion and upgrade in the process of investment cost and its final performance, but the expansion, upgrade costs and network performance is a pair of contradiction. Construction cost budget and control can get relatively accurate numerical, but the performance of the network is composed of many subjective and objective factors. On one hand, the network capacity expansion, upgrading and upgrades to existing users can guarantee the normal use, on the other hand, it also can provide competitive new business, and makes further expansion, upgrading and upgrades can be carried out smoothly. In this way, the network optimization becomes a long-term, iterative process.Network optimization should be able to according to the operators specific needs by means of software tool automatically, can also through manual intervention to achieve the capacity, coverage, QoS ensure a balance point. 3G network system structure is shown in figure 1. Generally, network and includes 3 levels:On Node B, the mobile station performance indicators for real-time calculation and simulation, including fast power control, rapid congestion resolved, wireless link adaptive, channel allocation;Real time load analysis and control;Based on experience or statistical results, through roadshow, network optimization software for network performance prediction.In front of 2 levels, in the network is completed, by the network management system through the online monitoring and statistics in real time automatic adjustment, while the third level is the need for professionals to carry out, also is we often say that the network optimization.Artificial network optimization can be divided into the following several steps:First of all, the operator should be based on their own characteristics the definition of a good network optimization is completed to achieve the goal, which determine the above mentioned balance point, including point-to-point quality objectives, different business types of performance indicators and related KPI ( key performance indicators) of various values; later, the existing network performance index data acquisition, through a variety of channels, such as network management system and the convergence device feedback, protocol analyzers and even maintenance department customer complaints such as summary, in conclusion, should be through a variety of ways, using a variety of means, collecting more data, the analysis result is accurate.The collected data is input to the network planning software analysis, can generate the current network status, or achieve some indexes are needed for network configuration. In the process of system simulation, some results in the initial analysis is complete, the error will be relatively large, at this time, some parameters are fine-tuned, local iterative analysis of system, it was repeatedly modified, will eventually get accurate results.Network optimization to achieve the purpose of including: improving network coverage, reduce the system call drop rate, loss rate, improve the switching success rate, on Node B load adjustment, optimization of Node B pilot frequency distribution. Optimization of indicators include: Node B sector transmission power, antenna height and angle, the adjacent Node B position and the pilot signal, the adjacent Node B pilot search window size, trigger switch threshold value.In the process of network optimization, we need to use different tools, and these tools have different effects.1 planning softwareIn detail simulation process, we will be new or expansion, upgrading the site information input to the electronic map. Through repeated simulation and tuning, resulting in some constraints ( such as site location, determining fixed configuration ), optimal coverage, capacity, quality of service indicators. Land use planning software optimization stage, through the simulation to determine the system factors include: Node B site, type of antenna, antenna angle. On the basis of the existing network expansion, upgrade, the operator is always concerned with optimization is completed, the new capacity can achieve the simulation predicted value.2 network manageme