摘要： 实时测量用户感知服务质量(QoS)是互联网服务商(ISP)调整服务质量和策略的重要依据。在对QoS关键技术进行深入研究的基础上，设计并实现了一个基于用户感知的网络性能测量系统UNPMS，介绍了UNPMS的基本结构、原理和相关技术。实验结果表明，可扩展的UNPMS系统能从终端用户的角度对不同ISP服务质量进行实时测量和分析，为真实评价用户感知的ISP服务质量提供了一个新思路。

关键词: 服务质量, 测量, 网络服务提供商

Abstract: Basing on in-depth research on the key techniques of network QoS, a user-perceived network performance measurement system (UNPMS) is designed and implemented. In the UNPMS, a detailed introduction to the implementation of UNPMS and its related technologies is given. Experiment results indicate the scalable UNPMS can do the real-time measurement on network performance of ISPs as an end user and it is a bran-new idea to measure and evaluate user-perceived QoS of ISPs。

Key words: Quality of Service(QoS), Measurement, Internet service provider(ISP)