| 基于IEEE802.15.4退避算法的改进机制 |
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| 引用本文： | 吉诚,徐友云,郑宝玉.基于IEEE802.15.4退避算法的改进机制[J].信息技术,2008,32(8). |
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| 作者姓名： | 吉诚 徐友云 郑宝玉 |
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| 作者单位： | 上海交通大学无线通信研究所,上海,200240 |
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| 摘 要： | IEEE802.15.4是供低速率、低功耗和低成本设备使用的短距离无线通信的协议,定义了低速无线个域网(LR-WPANs)的MAC层和物理层规范.由于在例如无线体域网(WBAN)应用中,能量消耗是备受关注的问题,因此提出了一种基于时槽机制的CSMA/CA过程中改进的退避算法,在每次CSMA/CA开始时根据过去的传输状况动态地调整竞争窗口的最小值.通过NS-2进行仿真,实验结果表明这样的改进方案在业务负载比较高或者包的大小比较小的时候可以减少数据包碰撞概率和重传概率,从而可以减少功耗并且提高吞吐量性能.
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| 关 键 词： | 功耗 吞吐量 |
Improved back off algorithm in slotted CSMA/CA for IEEE 802.15.4 |
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| JI Cheng,XU You-yun,ZHENG Bao-yu.Improved back off algorithm in slotted CSMA/CA for IEEE 802.15.4[J].Information Technology,2008,32(8). |
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| Authors: | JI Cheng XU You-yun ZHENG Bao-yu |
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| Affiliation: | JI Cheng,XU You-yun,ZHENG Bao-yu (Institute of Wireless Communication,Shanghai Jiaotong University,Shanghai 200240,China) |
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| Abstract: | IEEE 802.15.4 defines MAC and PHY specifications for low-rate wireless personal area networks (LR-WPANs), which targets wireless networking among low-rate, low-power and lowcost devices for short range telecommunication. This paper proposes an improved back off algorithm in slotted CSMA/CA, to dynamically change the minimum contention window each time CSMA/CA begins, according to the past transmission condition. The main contribution in this work is the low power consumption considered particularly in the a... |
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| Keywords: | IEEE 802 15 4 CSMA/CA |
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