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中文摘要：
针对认知无线电网络提出了一种基于中间件的分布式动态QoS保证机制DQAM，当网络对应用承诺的QoS保证发生变化，或者应用对网络的QoS要求发生变化时，通过网络和应用之间的反馈和协商，在分析当前网络状态和应用需求的基础上，根据特定的策略对网络和应用进行动态干预，在保证一定QoS的前提下，使应用最大程度的适应网络，网络最大限度的支持应用，以提高认知无线电网络对应用的支持能力和应用对网络的适应能力。对DQAM的原理、系统组成以及运行方式等，进行了讨论；从体系结构、工作过程、信息收集与策略生成和节点（任务）重构等4个方面，给出了DQAM的基本框架，并通过一个典型场景就DQAM的应用问题进行了探讨。
英文摘要：
This paper proposes a middleware based distributed dynamic QoS assurance mechanism for Cognitive Radio Networks （CRN）,named DQAM.When the network QoS assurance to applications or / and the applications QoS demand to network is / are ehanged,DQAM regulates the network and applications under certain strategies dynamically,based on the analysis of current network state and application demand through a feedback and negotiation mechanism between network and applications.DQAM can make applications adapt network and network support applications furthest, and improves the support ability of CRN to applications and adaptability of applications to CRN.This paper discusses the theory,the system composition and the operation method of DQAM,and puts forward the essential framework of DQAM from four aspects：System architecture,working process,information acquisition / strategies generation,and node （task） refactoring.At the end of the paper,the application problem of DQAM is discussed with a typical scenario.
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