802.11ec: collision avoidance without control messages
802.11ec: collision avoidance without control messages
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DOI：
10.1145/2348543.2348555
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发表时间：
2014-12
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通讯作者：
Eugenio Magistretti;Omer Gurewitz;E. Knightly
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文献类型：
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作者：
Eugenio Magistretti;Omer Gurewitz;E. Knightly
在本文中，我们设计，实现和评估802.11ec（编码控制），一个基于802.11的协议没有控制消息：相反，802.11ec采用可重复的符号序列，连同时间的代码被发送，编码所有的控制信息和改变的MAC的基本设计属性。可重复符号序列的使用提供了两个关键优点：（i）效率，因为它允许控制时间的近数量级的减少;（ii）鲁棒性，因为即使在低SINR下并且即使在邻居正在发送数据时，代码也很短并且容易检测。我们在一个基于FPGA的软件无线电上实现了802.11ec。我们进行了大量的实验，并表明，相比802.11（有和没有RTS/CTS），802.11ec实现了巨大的效率增益在传达控制信息，并解决了关键的吞吐量和公平性问题的存在下，隐藏终端，非对称拓扑结构，和一般的多跳拓扑结构。
In this paper, we design, implement and evaluate 802.11ec (Encoded Control), an 802.11-based protocol without control messages: instead, 802.11ec employs correlatable symbol sequences, which together with the timing the codes are transmitted, encode all control information and change the fundamental design properties of the MAC. The use of correlatable symbol sequences provides two key advantages: (i) efficiency, as it permits a near order of magnitude reduction of the control time; (ii) robustness, because codes are short and easily detectable even at low SINR and even while a neighbor is transmitting data. We implement 802.11ec on an FPGA-based software defined radio. We perform a large number of experiments and show that, compared to 802.11 (with and without RTS/CTS), 802.11ec achieves a vast efficiency gain in conveying control information and resolves key throughput and fairness problems in the presence of hidden terminals, asymmetric topologies, and general multi-hop topologies.