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中文摘要：
多媒体业务在异构网络传输过程中,由于现有的QoS（Quality of Service）类映射方法存在灵活性不足的问题,从而降低了系统端到端效能。针对这个问题,该文在深入分析当前的QoS类映射方法基础上,结合用户QoE（Quality of Experience）特点,借助于网络微积分理论,构建了QoS类映射的数学分析模型,并进行了理论分析。基于该数学分析模型,该文从用户QoE角度提出了具有弹性的QoS类映射方法（Elastic QoS Class Mapping Method,EQCMM）,该方法根据当前网络资源的使用情况,通过灵活地调整QoS类映射,充分利用网络现有资源,提高了端到端带宽资源的利用率,改善了系统端到端的效能。最后,通过仿真验证了该方法的有效性。
英文摘要：
To increase the end-to-end system efficiency with a flexible QoS （Quality of Service） class mapping scheme for transporting multimedia traffic over heterogeneous networks, by analyzing current QoS class mapping schemes which lack flexibility without considering user＇s QoE （Quality of Experience）, an analytical model is developed for end-to-end QoS provisioning based on network calculus theory. Based on this model, the paper derives an Elastic QoS Class Mapping Method （EQCMM） which considers user＇s QoE. With EQCMM, the result of QoS class mapping can be adjusted elastically according to available network resources, in order to achieve higher end-to-end system efficiency. Finally, simulation results are given to demonstrate the effectiveness of the proposed method.
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