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中文摘要：
动态频谱接入策略是实现认知无线电网络高效利用频谱的关键。与传统认知无线电网络不同，认知mesh网络中不同QoS需求的多类型业务共同接入，为适应这一特点，提出服务区分的动态频谱接入策略。策略依据业务的QoS需求确立优先级，针对不同优先级业务采取不同的信道接入方案，实时业务依据最优传输延迟期望选择接入信道集合，在减小传输延迟的同时降低数据传输过程授权用户出现的概率，普通业务选择最优理想传输成功概率的信道，降低信道切换概率。理论与实验结果表明，与传统的认知网络频谱接入策略相比，提出的策略能提供不同业务的服务区分，满足实时业务的低延迟需求，降低数据传输的中断率，同时在授权信道空闲率与网络负载较大时吞吐量性能较优。
英文摘要：
Dynamic spectrum access （DSA） is an important design aspect for cognitive radio network. Common access of multi-type services having different quality of service （QoS） requirements is the important characteristic of cognitive wireless mesh network. Differentiated service （DS） is the key to realize the high efficiency use of spectrum resources and to guarantee the high quality transmission of services. In order to satisfy the demand for multi-type services, a differen-tiated services dynamic spectrum access strategy was proposed. In this strategy, the unlicensed user traffic was divided into three priority classes. The DSA scheme uses different access mechanisms for the three classes of unlicensed users. The real-time traffic selectes available channel set according to the shortest expected delay to reduce the transmission time and the probability of appearance of licensed user during data transmission process. The general traffic selectes the channel of largest successful transmission probability to avoid spectrum handoff. The theoretical and experimental results show that, when compared with the traditional cognitive networks DSA strategy, the proposed strategy is able to guaran-tee different QoS for the various services, shorter transmission delay for higher priority services, reducing the probability of transmission interruption and better throughput performance when the vacancy rate of licensed channel is major and heavy network load.
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