中文摘要：

为了满足用户不断增强的移动宽带需求,3GPP于2004年启动了长期演进（LTE）与系统架构演进（SAE）的研究。由于LTE/SAE系统对UMTS网络进行了显著的改进,LTE/SAE的服务质量（QoS）机制也相应地做了许多改进和增强,比如通过简化承载业务架构,引入默认承载、QoS分类标识（QCI）等概念,最终实现了业务数据速率的提高以及用户体验的提升。通过将LTE/SAE系统的QoS与3GPP的2G和3G的QoS进行比较,介绍了移动通信网络中QoS的发展历程,说明LTE/SAE系统在哪些方面提高了用户体验。指出了目前LTE/SAE系统QoS机制还需要深入研究的问题。

英文摘要：

In order to satisfy the user＇s increasing demand in mobile broad band,the 3GPP organization began the long term evolution（LTE）/system architecture evolution（SAE）research project.Because the LTE/SAE system improves the UMTS network remarkably,the quality of service（QoS）mechanism also makes many improvements,such as predigesting the bearer service architecture,importing the concept of default bearer,QoS class identifier（QCI）,etc.,which achieves the increase of service data rate and the enhancement of user experience in the end.According to comparing the QoS of LTE/SAE to the 2G and 3G,introduce the development process of QoS in the mobile communication,and show the LTE/SAE system how to improve the user＇s experience.Point out the problem of QoS mechanism in the current LTE/SAE system,which needs more study.