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LTE系统语音业务质量评估与性能优化

发布时间:2018-10-23 20:42
【摘要】:随着移动通信技术的飞速发展,移动通信系统所提供的业务也日益丰富和多样化,而语音业务始终是众多通信业务中最基本的业务。对于正处在大规模商用阶段的LTE系统,其语音业务将不再是传统的电路域承载,而是由分组交换域提供。因此,如何保证LTE系统中用户对语音业务的体验质量仍是目前研究的重要问题之一。本文重点研究分析了LTE系统语音业务的三大主流解决方案的性能,并提出优化方案,保证了用户的体验质量,并研究异构网络中基于用户对不同业务体验质量的小区扩展方案。本文的具体工作和成果如下: 第一,研究分析了过渡性语音解决方案CSFB技术的KQI及KPI指标体系,并利用信令流程分析的方法建立CSFB业务KQI与KPI指标之间的映射模型,从而通过考察网络层面可测量的KPI指标来预估相应的KQI大小 第二,研究分析了LTE系统语音业务异系统切换方案SRVCC/eSRVCC,并基于OPNET网络仿真软件对eSRVCC切换方案进行仿真,通过仿真结果分析切换过程中影响切换性能的因素,最后针对切换触发策略和用户优先级两个方面提出优化方案。 第三,针对LTE系统语音业务目标解决方案VoLTE技术,通过对VoIP网络仿真平台数据的分析提出一种基于网络参数的语音质量评估方法,并对VoLTE业务的KQI及KPI指标进行分析,进而建立KQI与KPI指标间的映射模型。 第四,在LTE-Advanced系统中异构网络环境下,考虑到用户对不同业务的功率及体验质量需求的不同,提出一种基于用户体验质量的自适应小区范围扩展算法,并建立了MATLAB仿真平台,以验证所提算法的性能。
[Abstract]:With the rapid development of mobile communication technology, the services provided by mobile communication systems are increasingly rich and diversified, and voice services have always been the most basic of many communications services. For the LTE system which is in the large-scale commercial stage, its voice service will not be the traditional circuit domain bearer, but will be provided by the packet switching domain. Therefore, how to ensure the user's experience quality of voice service in LTE system is still one of the most important problems. This paper focuses on the performance of three major solutions for voice services in LTE systems, and proposes an optimized solution to ensure the user's experience quality, and studies the cell extension scheme based on the user's experience quality of different services in heterogeneous networks. The specific work and achievements of this paper are as follows: firstly, the KQI and KPI index system of transitional voice solution CSFB technology is analyzed, and the mapping model between CSFB service KQI and KPI index is established by the method of signaling flow analysis. Therefore, by investigating the measurable KPI index at the network level to estimate the corresponding KQI size second, this paper studies and analyzes the LTE voice service handoff scheme SRVCC/eSRVCC, and simulates the eSRVCC handoff scheme based on OPNET network simulation software. Based on the simulation results, the factors that affect the performance of handoff are analyzed. Finally, an optimization scheme is proposed for switching trigger strategy and user priority. Thirdly, aiming at VoLTE technology, a voice quality evaluation method based on network parameters is proposed by analyzing the data of VoIP network simulation platform, and the KQI and KPI indexes of VoLTE service are analyzed. Then the mapping model between KQI and KPI index is established. Fourthly, in the heterogeneous network environment of LTE-Advanced system, considering the different demands of users for different service power and experience quality, an adaptive cell range extension algorithm based on user experience quality is proposed, and the MATLAB simulation platform is established. To verify the performance of the proposed algorithm.
【学位授予单位】:北京理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TN929.5

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