| Mathematical Analysis of Energy Efficiency in IEEE 802.11 DCF |
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| 作者姓名： | 高波 杨宇航 马惠业 |
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| 作者单位： | [1]Department of Electronic. Engineering, Shanghai Jiaotong University, Shanghai 200030, China [2]Department of Computer Science and Engineering, Chinese University of Hong Kong, Hong Kong, China |
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| 摘 要： | The standardized IEEE ,802. II distributed coordination function （ DCF） provides a contention-based distributed channel access mechanism for mobile stations to share the wireless medium. However, when stations are mobile or portable units, power consumption becomes a primary issue since terminals are usually battery driven. This paper proposes an analytical model that calculates the energy efficiency of both the basic and the RTS/CTS access mechanisms of the IEEE 802. II protocol. The model is validated with simulation results using NS-2 simulation package. The effects of the network size, the average packet length, the initial contention window and maximum backoff stages on the energy efficiency of both access mechanisms are also investigated. Results show that the basic scheme has low energy efficiency at large packet length and large network size, and depends strongly on the number of stations and the backoff procedure parameters. Conversely, the RTS/CTS mechanism provides higher energy efficiency when the network size is large, and is more robust to variations in the backoff procedure parameters.
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| 关 键 词： | IEEE 802.11 分布式调和函数 DCF 无线移动通信 通信协议 |
| 收稿时间： | 2005-05-23 |
Mathematical Analysis of Energy Efficiency in IEEE 802.11 DCF |
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| GAO Bo,YANG Yuhang,MA Huiye.Mathematical Analysis of Energy Efficiency in IEEE 802.11 DCF[J].Transactions of Tianjin University,2005,11(5):332-337. |
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| Authors: | GAO Bo YANG Yuhang MA Huiye |
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| Abstract: | The standardized IEEE 802. 11 distributed coordination function (DCF) provides a conten- tion-based distributed channel access mechanism for mobile stations to share the wireless medium. However, when stations are mobile or portable units, power consumption becomes a primary issue since terminals are usually battery driven. This paper proposes an analytical model that calculates the energy efficiency of both the basic and the RTS/CTS access mechanisms of the IEEE 802. 11 protocol. The model is validated with simulation results using NS-2 simulation package. The effects of the network size, the average packet length, the initial contention window and maximum backoff stages on the energy efficiency of both access mechanisms are also investigated. Results show that the basic scheme has low energy efficiency at large packet length and large network size, and de- pends strongly on the number of stations and the backoff procedure parameters. Conversely, the RTS/CTS mechanism provides higher energy efficiency when the network size is large, and is more robust to variations in the backoff procedure parameters. |
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| Keywords: | energy efficiency IEEE 802 11 wireless local area networks ( WLANs) distributed co- ordination function ( DCF) |
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