基于QoS的认知无线电网络MAC协议(英文) 被引量：2

QoS-based MAC protocol for cognitive radio networks

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摘要为提高认知环境中次用户的吞吐量性能,提出了一种基于QoS的MAC协议. 认知节点将信道状态映射为向量,收端与发端通过"与"操作得到最终的信道映射,并获得备选信道集合. 上层应用程序传来的数据根据QoS要求被划分为2个优先级,每种级别的数据对应不同的竞争窗口,从而保证了实时数据具有较高的优先级. 使用二维离散时间马尔科夫链分析了系统的性能并推导出系统吞吐量的数学表达式. 仿真结果证实,与IEEE 802.11 DCF相比,所提协议有助于提高系统吞吐量. In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this protocol, the CR node maps the channel state as a vector, and the transmitter and the receiver obtain the final channel map through an AND operation to prepare for an optional channel set. Data from the upper application layer are classified into two priority levels according to the QoS requirement. The data of each level relate to different contention windows so that the priority of real time data can be guaranteed. A two-dimensional discrete-time Markov chain is utilized to evaluate the system performance, and mathematical expressions of the system throughput are derived. Simulation results show that compared with the IEEE 802. 11 distributed coordination function （DCF）, the proposed MAC protocol can achieve higher throughput.

作者胡静沈连丰宋铁成

机构地区东南大学移动通信国家重点实验室

出处《Journal of Southeast University(English Edition)》 EI CAS 2012年第4期375-379,共5页 东南大学学报（英文版）

基金 The National Science and Technology Major Project( No. 2010ZX03006-002-01 ) the National Basic Research Program of China ( 973 Program) ( No. 2011CB302905) the Science and Technology Support Program of Jiangsu Province ( No. BE2011177)

关键词服务质量认知无线电媒体接入控制信道映射马尔科夫链 quality of service （QoS） cognitive radio media access control （MAC） channel map Markov chain

分类号 TN92 [电子电信—通信与信息系统]

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参考文献9

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