EVD0下切问题分析与优化方法研究

发布时间：2018-03-26 00:06

本文选题：移动通信网络　切入点：CDMA　出处：《复旦大学》2014年硕士论文

【摘要】：CDMA 2000 1X EVDO作为面向第三代(3G)无线通信系统的标准之一,可在多种环境条件下以不同的服务质量(QoS)支持多种/复合业务(如话音、分组/电路数据、定位业务),满足3GPP2的要求。在移动通信行业市场竞争日趋激烈的情况下,如何提高3G用户满意度、提高用户对3G网络感知、提高现有网络维护水平和优化质量,最大限度的提升网络运行效益,已经成为通讯运营商网络维护中的重要课题。本文首先介绍了上海电信EVDO覆盖网络现状和研究3G下切2G问题的背景。由于目前上海电信运营的3G EVDO网络主要用于承载数据业务,而3GEVDO与2G 1X网络在数据峰值吞吐率、用户面时延、QoS保障等方面存在较大差距,当发生网络异常下切后,将严重影响网络用户感知,在3G用户规模发展,以上海等一批特大城市中,3G下切2G问题成为3G EVDO移动网络运营商遇到的一大突出问题。其次从移动通信基本概念和工作原理方面介绍了CDMA20001X向EVDO技术演进概述、混合组网网络结构、EVDO移动通信系统理论,并在此基础上系统地对造成下切的原理和机制进行了研究、结合上海现网实际问题进行了下切率的算法进行了分析。本文的特点就是对3G下切2G的原理从不同角度进行分析,对下切的原因以及跨系统的用户呼叫详细记录(PCMD)进行深入联合分析,提出了较为准确的下切问题定位算法,并根据算法机制进行提出相应的优化方法。然后本文全面深入地介绍了本次专题工作针对不同下切机制、下切场景的多种解决下切问题的方法,包括针对设备负荷、故障问题、前反向链路覆盖等多种下切原因的优化方法,同时通过建立的下切分析算法和工具对优化措施的实施效果进行验证和跟踪分析,较大地改善了上海电信现网的EVDO无线侧数据域下切问题。本专题工作相关成果,包括下切问题分析工具、形成的下切问题的优化分析评估体系及优化流程,均被中国电信集团公司采纳,相关优化实施案例被作为《提升用户感知之3G下切2G分析优化操作手册》中阿朗设备区的典型案例在各电信省公司范围内进行交流、学习。
[Abstract]:CDMA 2000 1X EVDO is one of the standards for 3G wireless communication systems. It can support multiple / composite services (such as voice, packet / circuit data) with different quality of service (QoS) under a variety of environments. Under the increasingly fierce market competition in the mobile communication industry, how to improve the satisfaction of 3G users, improve users' perception of 3G network, improve the level of network maintenance and improve the quality of existing networks, and meet the requirements of 3GPP2. To maximize the efficiency of network operation, It has become an important topic in the network maintenance of telecommunication operators. Firstly, this paper introduces the current situation of EVDO coverage network of Shanghai Telecom and the background of studying 3G down-cut 2G problem. At present, the 3G EVDO network operated by Shanghai Telecom is mainly used to carry data services. However, there is a big gap between 3GEVDO and 2G1X network in terms of data peak throughput, user delay, QoS guarantee and so on. When network anomaly occurs, it will seriously affect network user perception and develop in 3G user scale. The 3G undercut 2G problem in Shanghai and other mega-cities has become a major problem encountered by 3G EVDO mobile network operators. Secondly, the evolution of CDMA20001X to EVDO technology is introduced from the basic concept and working principle of mobile communication. Based on the theory of EVDO mobile communication system, the principle and mechanism of cutting down are systematically studied. Combined with the actual problem of Shanghai current network, the algorithm of undercutting rate is analyzed. The characteristic of this paper is to analyze the principle of 3G undercut 2G from different angles. In this paper, the reason of the downcut and the detailed record of the user call across the system are analyzed, and a more accurate algorithm for the location of the down-cut problem is put forward. According to the algorithm mechanism, the corresponding optimization method is put forward. Then, this paper comprehensively and deeply introduces the various methods to solve the down-cutting problem, including the equipment load, the fault problem, which is aimed at different down-cutting mechanism and the down-cutting scene. At the same time, the optimization methods of various down-cut reasons, such as forward and reverse link coverage, are used to verify and track the effect of the optimization measures through the established down-cut analysis algorithms and tools. It has greatly improved the EVDO wireless side data domain down-cut problem of Shanghai Telecom. The related achievements of this topic, including the down-cut problem analysis tool, the optimized analysis and evaluation system and the optimization process of the down-cut problem, have been developed. All of them were adopted by China Telecom Corporation, and the relevant optimization cases were used as typical cases in the Arang equipment area to communicate and learn from each telecom company in the "2G Analysis and Optimization Manual for improving user perception".
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53

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