Transmission power control for 802.11: a carrier-sense based NAV extension approach
Transmission power control for 802.11: a carrier-sense based NAV extension approach
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DOI：
10.1109/glocom.2005.1578412
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Rao;S. Biswas
中科院分区：
文献类型：
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作者：
J. Rao;S. Biswas
提出了一种基于载波监听的发射功率控制协议CSNE-PC，解决了基于IEEE 802.11的网络中基本功率控制协议能量效率低的问题。在BPC中，RTS和CTS分组以全功率交换，而数据和确认传输以低功率执行。虽然BPC具有直观和易于实现的优点，但由于存在唯一的隐藏冲突问题，因此BPC的能量效率显著降低，本文提出的方法消除了这一问题。在CSNE-PC中，节点测量和分析其载波侦听活动，以在载波侦听范围的扩展邻域内检测802.11个CTS分组。在检测到CTS分组时，节点设置或扩展其MAC层NAV，并在数据分组持续时间内进入静默模式。与BPC不同，这使CSNE-PC能够控制传输功率，而不必遭受额外的数据冲突。通过仿真评估表明，在可持续负载条件下，CSNE-PC在保持常规802.11协议吞吐量和时延特性的同时，发送和接收能量合计可减少高达38%
This paper presents a carrier-sense based transmission power control protocol, CSNE-PC, which addresses the energy inefficiency of basic power control protocols (BPC) for IEEE 802.11 based networks. In BPC, RTS and CTS packets are exchanged at full power while data and acknowledgement transmissions are carried out at low power. While being intuitive and simple to implement, BPC's energy efficiency is significantly degraded by a unique hidden collision problem, which is removed by the approach in this paper. In CSNE-PC, a node measures and analyses its carrier-sense activities for detecting 802.11 CTS packets in the extended neighborhood of carrier sense range. Upon detecting a CTS packet, the node sets or extends its MAC layer NAV and enters into a silence mode for the data packet duration. Unlike BPC, this enables CSNE-PC to control transmission power without having to suffer from additional data collisions. Evaluation of CSNE-PC through simulation demonstrates that under sustainable loading conditions, reduction in combined transmit and receive energy for CSNE-PC can be as high as 38%, and that is while retaining the throughput and delay characteristics of the regular 802.11 protocol