MiSer: an optimal low-energy transmission strategy for IEEE 802.11a/h
MiSer: an optimal low-energy transmission strategy for IEEE 802.11a/h
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DOI：
10.1145/938985.939003
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发表时间：
2003-09
期刊：
影响因子：
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通讯作者：
D. Qiao;Sunghyun Choi;Amit Jain;K. Shin
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文献类型：
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作者：
D. Qiao;Sunghyun Choi;Amit Jain;K. Shin
在广泛部署且呈指数级增长的IEEE 802.11无线局域网(WLAN)中，降低无线通信设备的能耗可能是最重要的问题。传输功率控制(TPC)和物理层(PHY)速率自适应被认为是实现这一目标的两种最有效的方法。新兴的802.11h标准是对现有的802.11媒体访问控制协议和高速802.11a物理层协议的扩展，它将提供一种结构化的方法来支持智能TPP。其核心思想是离线计算最优速率-功率组合表，然后在运行时，无线站点通过简单的表查找来确定每个数据帧的最节能传输策略。本文的另一个重要贡献是对802.11a/h系统中不同无线电距离之间的关系以及TPC对干扰的影响进行了严格的分析，这证明了Miser通过在更强的功率水平上传输CTS帧来改善TPC引起的干扰的方法是正确的。仿真结果表明，MISER比无TPC的PHY速率自适应方案每单位能耗多传输约20%的数据，而由于PHY速率自适应的出色节能能力，MISER的性能明显优于单速率TPC方案。
Reducing the energy consumption by wireless communication devices is perhaps the most important issue in the widely-deployed and exponentially-growing IEEE 802.11 Wireless LANs (WLANs). TPC (Transmit Power Control) and PHY (physical layer) rate adaptation have been recognized as two most effective ways to achieve this goal. The emerging 802.11h standard, which is an extension to the current 802.11 MAC and the high-speed 802.11a PHY, will provide a structured means to support intelligent TPC.In this paper, we propose a novel scheme, called MiSer, that minimizes the communication energy consumption in 802.11a/h systems by combining TPC with PHY rate adaptation. The key idea is to compute offline an optimal rate-power combination table, and then at runtime, a wireless station determines the most energy-efficient transmission strategy for each data frame by a simple table lookup. Another key contribution of this paper is to provide a rigorous analysis of the relation among different radio ranges and TPC's effect on the interference in 802.11a/h systems, which justifies MiSer's approach to ameliorating the TPC-caused interference by transmitting the CTS frames at a stronger power level. Our simulation results show that MiSer delivers about 20% more data per unit of energy consumption than the PHY rate adaptation scheme without TPC, while outperforming single-rate TPC schemes significantly thanks to the excellent energy-saving capability of PHY rate adaptation.