| 非饱和状态下时隙CSMA/CA机制改进与性能分析 |
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| 引用本文： | 陈金,樊晓平,刘少强,陈志杰.非饱和状态下时隙CSMA/CA机制改进与性能分析[J].计算机工程与应用,2012,48(30):140-146. |
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| 作者姓名： | 陈金 樊晓平 刘少强 陈志杰 |
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| 作者单位： | 1.中南大学 信息科学与工程学院，长沙 410075
2.湖南财政经济学院 网络化系统研究所，长沙 410205 |
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| 基金项目： | 国家自然科学基金(No.60776834,No.60870010) |
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| 摘 要： | 针对无线传感器网络中有重要信息的高优先级数据包需要尽快传输，且IEEE 802.15.4协议本身不支持任何优先级机制的情况，结合优先级调度策略和差分服务机制，对具有优先级级的时隙CSMA/CA机制进行全面数学建模，包括节点马尔科夫模型和信道马尔科夫模型，据此提出了一种非饱和状态下具有优先级的IEEE 802.15.4时隙CSMA/CA机制性能的分析方法。通过比较分析，改进的机制对提高网络中高优先级数据包的传输性能具有积极作用。
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| 关 键 词： | 时隙CSMA/CA 节点马尔科夫模型 信道马尔科夫模型 优先级 |
Improved analytical model for slotted CSMA/CA mechanism in non-saturation environments |
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| CHEN Jin
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FAN Xiaoping
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LIU Shaoqiang
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CHEN Zhijie.Improved analytical model for slotted CSMA/CA mechanism in non-saturation environments[J].Computer Engineering and Applications,2012,48(30):140-146. |
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| Authors: | CHEN Jin FAN Xiaoping LIU Shaoqiang CHEN Zhijie |
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| Affiliation: | 1.School of Information Science and Engineering, Central South University, Changsha 410075, China
2.Laboratory of Networked Systems, Hunan University of Finance and Economics, Changsha 410205, China |
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| Abstract: | Considering that high-priority packets in the network of emergency or critical events should transmit as soon as possible, IEEE 802.15.4 standard protocol itself does not support any priority mechanism. Priority scheduling strategy and service differentiation mechanism are adopted. A comprehensive mathematical modeling for the slotted CSMA/CA algorithm is established for the first time, including the node Markov model and channel Markov model. An improved analytical method for IEEE 802.15.4 slotted CSMA/CA in non-saturation environments, is proposed. The analytical results show that the high priority packet real-time transmission performance is effectively improved. |
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| Keywords: | slotted CSMA/CA node Markov model channel Markov model priority |
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