摘  要

随着LTE网络的规模覆盖以及支持VOLTE的终端产业链的不断丰富，中国电信VOLTE业务的试商用计划在逐步推进。作为在4G时代提供语音服务的VoLTE(Voice Over LTE)，即基于LTE的语音通信，其核心网完全舍弃了电路域(CS)，只保留了唯一的分组域(PS)，所有的数据，语音业务全在分组域”解决”.相比于传统的2G或者3G通信技术，VoLTE不仅可以完成高质量的多媒体会话，而且可以提供类似语音呼叫管理服务及对多媒体会话进行灵活合理的计费。其必将成为未来移动用户首选的语音通话业务。然而，VoLTE是一种开放的网络架构，使用的是基于SIP协议的全IP网络，所有的语音电话都经由分组域而非电路域，这种特征也使得VoLTE面临诸多的安全问题，特别要指出的是两类安全问题：一个是终端用户与业务网之间身份认证的安全，另一个则是用户间语音数据的安全。

VOLTE业务作为承载在4G网络的语音业务，提供高质量的音频视频通话，对IP承载网的质量及周边网络的配合和兼容也提出更高的要求。本文总结分析了衡南县雁峰区VOLTE网络在内部体验测试和拉网测试中的典型案例，供大家参考学习，以便进一步提高衡南县雁峰区VOLTE网络的维护质量，探索维护新模式。

关键词：4G通信；数据分析；VOLTE；SIP；时延

Abstract

With the scale coverage of the LTE network and the enrichment of the terminal industry chain supporting VOLTE, China Telecom VOLTE business trial business plan is gradually advancing. VoLTE G Voice Over LTE, LTE – based voice communications, And its core network completely abandoned the circuit domain (CS), A unique grouping domain (PS), All the data, The voice service is all in the subgroup domain “solve “. Than G traditional 2 or 3 communications G, VoLTE can not only complete high-quality multimedia sessions, And can provide similar voice call management services and multimedia sessions for flexible and reasonable billing. It will become the preferred voice call service for mobile users in the future. However, VoLTE is an open network architecture, Using a full IP network based on SIP protocols, All voice calls go through packet domains rather than circuit domains, And that makes VoLTE face a lot of security problems, In particular, there are two types of security issues: one is the security of identity authentication between the end user and the business network, The other is the security of voice data between users.

VOLTE service, as a voice service carrying in the 4 G network, provides high quality audio and video calls, which also puts forward higher requirements for the quality of the IP carrying network and the cooperation and compatibility of the This paper summarizes and analyzes the typical cases of VOLTE network in Yanfeng District of Hengnan County in internal experience test and network pulling test for your reference and study in order to further improve the maintenance quality of Yanfeng District VOLTE network in Hengnan County and explore a new maintenance model.

Keywords :4 G communication; data analysis; VOLTE;SIP; delay

目  录

摘  要 I

Abstract II

第一章 绪论 1

1.1 4G技术的概念 1

1.2 4G技术的6大优势 2

1.2.1高速率，高容量 2

1.2.2无缝连接 2

1.2.3全IP的核心网络 2

1.2.4高度智能化和兼容性 3

1.2.5整合性的便利服务 3

1.2.6通信费用更加便宜 3

1.3 4G通信中的关键技术 4

1.3.1 正交频分复用(OFDM)技术 4

1.3.2 软件无线电技术 5

1.3.3 智能天线技术 5

1.3.4 MIMO技术 6

1.3.5 基于IP的核心网 6

第二章 测试数据分析 8

2.1概述 8

2.2道路测试拉网结果统计 8

2.3未接通/掉话和CSFB问题事件点汇总 9

2.4问题详细分析 10

2.4.1掉话和未接通问题分析 10

2.4.2其他问题分析 11

第三章 总结 15

参考文献 15

致    谢 17