LTE网络语音业务解决方案研究

发布时间：2018-05-18 10:30

本文选题：LTE + 语音业务　；参考：《吉林大学》2014年硕士论文

【摘要】：移动通信的多业务化、高速化要求，促进了无线组网技术的不断发展。最新的应用体现在LTE(Long Term Evolution)网络的大规模建设和全球迅猛发展。LTE是基于数据服务的无线网络，是以提供尽量大的数据吞吐量为目的，在此基础上实现各种通信服务，2G和3G的发展路径是以语音业务为基础，进而延伸到互联网业务。LTE业务的发展与其有着明显的区别。事实上，LTE被认为是‘一步到位’且‘技术可以不断生长’的无线数据通信平台。为实现高带宽、低延时的目的，LTE网络在网络结构和无线接口采用了不同于3G的技术，散失了对3G网络的后向兼容性，使得新老网络间的互通成为亟待解决的问题，尤其体现在语音服务方面。 LTE的语音解决方案也是运营商LTE网络建设及终端厂家重点关注的问题。LTE网络是完全基于分组域架构，，无法提供像3G WCDMA和2G GSM基于电路域的语音通话，而要实现全网VoLTE的语音解决方案，需要终端、无线和核心网的全面支持和优化，需要全网部署IMS网络，以当前技术来看其实现难度较大。本文通过对现有2G GSM网和3G WCDMA网所能承载业务的能力、各网已建设基站数量及覆盖范围等情况的调查和分析，依据LTE的业务特点，结合目前网络承载语音和数据的发展情况，对未来用户业务进行合理分析及预测。科学预测话务分布重点、合理布局网络和均衡话务量，得出LTE网络需要建设的重点区域及预计承载的业务量，并对LTE原理、网络架构及几个关键技术进行了深入研究，在此基础上，结合LTE试验网的经验数据，确定LTE网络的建设原则。主要研究内容如下：在分析2G、3G和LTE网络结构和信令流程的基础上，对当前的LTE语音服务实现的解决方案中双待机(SV-LTE:Simultaneous Voice and LTE)、CSFB (Circuit SwitchedFallback)和VoLTE（Voice LTE），进行了归纳比较，分析其优劣。通过对某城市联通LTE网络语音业务解决方案设计，认为在LTE未来实现普遍覆盖并全面替代3G网络之前，语音回落技术（CS Fallback）是可行的方案，是在产业界未实现VoLTE时提出的一种相对较为简单的语音解决方案。且必将在相当长的时期内保持存在。通过对LTE实现语音回落的技术原理、要求等进行探讨，对LTE语音业务实现的网络结构提出了建议。基于本文的研究工作和成果为LTE网络建设中语音业务部分，提供了技术参考，具有理论和实际工程意义。
[Abstract]:The multi-service and high-speed requirements of mobile communication promote the continuous development of wireless networking technology. The latest applications are embodied in the large-scale construction of the LTE(Long Term Evolution network and the rapid development of the world. LTE is a wireless network based on data services that aims to provide as much data throughput as possible. On this basis, the development path of various communication services such as 2G and 3G is based on voice service, and then extends to the development of Internet service. LTE has obvious difference with it. In fact, LTE is considered a 'one-step' wireless data communication platform. In order to realize the goal of high bandwidth and low delay, LTE network adopts different technology than 3G in network structure and wireless interface, and the backward compatibility of 3G network is lost, which makes the interworking between new and old networks an urgent problem to be solved. Especially in voice services. The voice solution of LTE is also the focus of LTE network construction and terminal manufacturers. LTE network is completely based on packet domain architecture, and can not provide voice calls such as 3G WCDMA and 2G GSM based on circuit domain. In order to realize the voice solution of VoLTE in the whole network, it needs the support and optimization of the terminal, wireless and core network, and the IMS network needs to be deployed in the whole network, which is difficult to realize in view of the current technology. Based on the investigation and analysis of the capacity of the existing 2G GSM network and 3G WCDMA network to carry the service, the number and coverage of the base stations built in each network, and according to the characteristics of the LTE service, combined with the development of the current network carrying voice and data, this paper analyzes the characteristics of the existing 2G GSM network and 3G WCDMA network. Reasonable analysis and forecast of future user service. Scientific prediction of traffic distribution, rational distribution of network and balanced traffic, the key areas to be constructed and the traffic volume expected to be carried out in LTE network are obtained. The principle of LTE, network architecture and several key technologies are studied in depth. On this basis, combined with the empirical data of LTE network, the construction principle of LTE network is determined. The main contents of the study are as follows: Based on the analysis of 2G 3G and LTE network structure and signaling flow, the advantages and disadvantages of SV-LTE: Simultaneous Voice and LTEX / CSFB Circuit switched Fallbackand VoLTE(Voice LTEN are summarized and compared in the current solution of LTE voice service implementation, and the advantages and disadvantages are analyzed. Based on the solution design of LTE network voice service of a certain city Unicom, it is considered that before LTE realizes universal coverage and replaces 3G network in the future, the voice fallback technology (CS Fallback) is a feasible scheme. It is a relatively simple voice solution when VoLTE is not implemented in industry. And must remain in existence for quite a long time. Based on the discussion of the technical principle and requirements of LTE to realize voice fallback, the paper puts forward some suggestions on the network structure of LTE voice service. Based on the research work and results of this paper, it provides a technical reference for the voice service in the construction of LTE network, and has theoretical and practical engineering significance.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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