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Performance analysis of energy-efficient MAC protocols using bidirectional transmissions and sleep periods in IEEE 802.11 WLANs

机译：IEEE 802.11 WLAN中使用双向传输和睡眠时间的节能MAC协议的性能分析

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摘要

The Distributed Coordination Function (DCF) is the mandatory access method for any compliant device in Wireless Local Area Networks (WLANs) based on the IEEE 802.11 Standard. WLAN Access Points (APs) and stations (STAs) contend for the access to the wireless channel in order to transmit data by using a variation of Carrier Sense Multiple Access (CSMA). In doing so, they consume a significant amount of energy for continuously monitoring the channel state. In this paper we investigate backwards-compatible mechanisms to increase throughput and energy efficiency in WLANs during contention periods based on DCF. The first mechanism is called Bi-Directional DCF (BD-DCF) because it allows for bidirectional transmissions between APs and STAs with a single channel access invocation. The second mechanism is called Bi-Directional Sleep DCF (BDSL-DCF) as it allows overhearing STAs to enter the sleep state, i.e. switch off the radio transceiver, during bidirectional transmissions. We analyze the performance limits of the proposed protocols in terms of throughput and energy efficiency considering different values for the data packet length and data rate. The results of this work show that the BD-DCF and BDSL-DCF protocols can improve throughput up to 60% and energy efficiency up to 360% when compared to legacy DCF.
机译：分布式协调功能（DCF）是基于IEEE 802.11标准的无线局域网（WLAN）中任何兼容设备的强制访问方法。 WLAN接入点（AP）和站（STA）争夺对无线信道的访问，以便通过使用载波侦听多路访问（CSMA）的变体来传输数据。这样做，它们消耗大量能量以连续监视信道状态。在本文中，我们研究了基于DCF的向后兼容机制，以在竞争期间提高WLAN的吞吐量和能效。第一种机制称为双向DCF（BD-DCF），因为它允许通过单个通道访问调用在AP和STA之间进行双向传输。第二种机制称为双向睡眠DCF（BDSL-DCF），因为它允许监听的STA在双向传输期间进入睡眠状态，即关闭无线电收发器。考虑到数据包长度和数据速率的不同值，我们在吞吐量和能效方面分析了所提出协议的性能限制。这项工作的结果表明，与传统的DCF相比，BD-DCF和BDSL-DCF协议可以将吞吐量提高60％，将能源效率提高360％。

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