进入二十一世纪，移动通信业务迅猛发展，在网络大规模发展建设的同时，各运营企业对网络的运行质量、服务质量、网络结构及配置的合理性更加关注，网络如何继续科学合理地发展下去，以满足将来业务可持续发展和新业务开拓的需求，各移动运营商纷纷把网络优化纳入了重要日程。辽源移动GSM移动网络从1997年开始建设以来，经过6年多的发展，同样渴求网络优化，特别是在用户行为主要集中在中心地带，其基站的各小区均为高载频配置小区，再加上基站天线挂高的差异，使有些相邻小区的同、邻频干扰较为严重，个别天线挂高较高的基站的干扰情况就更加突出。因此如何解决市区频率干扰，合理控制基站覆盖区域，提高实际通话质量就成为辽源移动GSM无线网络优化研究的重点，本论文就是基于如此背景下，在对GSM系统原理、无线网络优化原理进行了细致研究前体现下，结合辽源移动GSM网络实际工程实践，把理论应用于现实中，取得了良好的效果广州翻译公司。
Into the 21st century, mobile communication businesses have been developing rapidly. While large-scale network construction is now underway, all operators focus more on the network’s operation quality, service quality, and rationality of network structure and configuration. The issues about how the network can continue its scientific and reasonable development to meet the need for future sustainable business development and the need for promotion of new businesses have now been listed as key tasks on agenda of mobile operators aiming at network optimization. Six years of development passed since 1997 when construction of Liaoyuan Mobile GSM mobile network began, while network optimization is also aspired to now. The problem is that in some belts where mobile users are concentrated, all base stations’ communities are configured with high-frequency devices, plus the different heights of antennae in base stations, resulting in severe co-channel or next-channel interference with base stations of higher antennae impacted more. So the issues about how to eliminate channel interference in urban areas, how to reasonably control the coverage of base stations, and how to raise actual call quality have been emphasized in the Liaoyuan Mobile’s efforts for wireless network optimization. Set in this context and under the precondition of careful studies on principles of GSM system and wireless network optimization, this paper, through incorporating the GSM network engineering practices of Liaoyuan Mobile, has utilized theories into reality, and obtained good effects.
GSM属第二代移动通信系统，是一种功能齐全、技术先进、设备复杂的公用移动通信系统。主要组成部分可分为移动台（MS）、基站子系统（简称基站BS）、网络子系统（NSS）。其中基站子系统由基站收发台（BTS）和基站控制器（BSC）组成；网络子系统由移动交换中心（MSC）和操作维护中心（OMC）以及归属位置寄存器（HLR）、访问位置寄存器（VLR）、鉴权中心（AUC）和设备寄存器（EIR）等日语翻译。
GSM belongs to the second generation of mobile communication system, is a public communication system that is characterized by complete functions, advanced technologies, and complicated equipments. Main components can be divided into mobile station (MS), base station subsystem (shortly called BS), and network sub-system (NSS). BS is composed of base transceiver station (BTS) and base station center(BSC); NSS is composed of mobile switch center (MSC), operation and maintenance center (OMC), home location register (HLR), visitor location register (VLR), uthentication center (AUC), equipment identification register (EIR), etc.
