| 一种基于多层优先级和差分服务机制的CSMA/CA改进算法 |
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| 引用本文： | 陈涛,朱马锋.一种基于多层优先级和差分服务机制的CSMA/CA改进算法[J].西华大学学报(自然科学版),2015,34(2):16-21. |
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| 作者姓名： | 陈涛 朱马锋 |
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| 作者单位： | 成都理工大学;重庆邮电大学 |
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| 基金项目： | 国家自然科学基金“基于物联网技术的呼吸、脉搏异变及跌落的实时检测与报警的关键技术研究”(61171190) |
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| 摘 要： | 针对CSMA/CA算法的回退指数变化固定、对第2次CCA检测信道为忙时的处理不当这2个不足，提出一种基于多层优先级和差分服务机制的时隙CSMA/CA算法。通过优先级设定不同的回退指数BE，采用CCA2失败时再执行1次CCA的方法来克服以上2个不足。OPNET仿真结果表明，该算法在吞吐量、网络时延、成功接入信道概率方面优于原CSMA/CA算法。
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| 关 键 词： | 时隙CSMA/CA 多层优先级 差分服务机制 OPNET |
An Improvement Algorithm of Slotted CSMA/CA with Service Differentiation and Priority Mechanism |
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| CHEN Tao;ZHU Ma-feng.An Improvement Algorithm of Slotted CSMA/CA with Service Differentiation and Priority Mechanism[J].Journal of Xihua University:Natural Science Edition,2015,34(2):16-21. |
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| Authors: | CHEN Tao;ZHU Ma-feng |
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| Affiliation: | CHEN Tao;ZHU Ma-feng;Chengdu University of Technology;Chongqing University of Posts and Telecommunications; |
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| Abstract: | There are two shortages exiting in CSMA/CA: the backoff exponent(BE) increases linearly and it perform not well in the case of CAA2 detected being busy.In this paper, a kind of CSMA/CA algorithm with multi-level priority strategy and service differentiation mechanisms is proposed. Two problems are overcome with different BE based on priority strategy and performing the CAA again after the CCA2 failed slot. Results of experiment on OPNET platform show that the proposed algorithm performs better than the original one in aspects of the throughput, network delay and the probability of successfully access to channel.
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