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Analysis of a network coding-aware MAC protocol for IEEE 802.11 wireless networks with Reverse Direction transmissions

机译：具有反向传输的IEEE 802.11无线网络的网络编码感知MAC协议分析

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The implementation of Network Coding (NC) in IEEE 802.11-based wireless networks presents the important challenge of providing additional transmission priority for the relay nodes responsible for coding. These nodes are able to convey more information in each transmission than those that forward single packets, by combining several received packets in a single coded packet. To transmit data, the nodes execute the IEEE 802.11 Medium Access Control (MAC) protocol, called the Distributed Coordination Function (DCF). Thus, they compete for the access to the wireless channel and get equal transmission opportunities under high congestion. As a result, congested relay nodes will severely limit the performance of the network. In this paper, we investigate a backwards-compatible mechanism, called Reverse Direction DCF (RD-DCF), that allows relay nodes to transmit data upon successful reception of data. We analyze the performance limits of the proposed protocol with and without NC in terms of throughput and energy efficiency. The performance evaluation considers different traffic loads, packet lengths, and data rates. The results of this work show that the proposed RD-DCF+NC protocol can improve throughput and energy efficiency up to 335% when compared to legacy DCF.
机译：在基于IEEE 802.11的无线网络中网络编码（NC）的实现提出了重要的挑战，即为负责编码的中继节点提供额外的传输优先级。通过将几个接收到的数据包组合到一个编码数据包中，这些节点在每次传输中都能够比转发单个数据包传递更多的信息。为了传输数据，节点执行称为分布式协调功能（DCF）的IEEE 802.11介质访问控制（MAC）协议。因此，它们争夺对无线信道的访问，并在高度拥塞的情况下获得平等的传输机会。结果，拥塞的中继节点将严重限制网络的性能。在本文中，我们研究了一种向后兼容的机制，称为反向DCF（RD-DCF），该机制允许中继节点在成功接收数据后发送数据。我们在吞吐量和能效方面分析了有无NC情况下所提出协议的性能限制。性能评估考虑了不同的流量负载，数据包长度和数据速率。这项工作的结果表明，与传统DCF相比，提出的RD-DCF + NC协议可以将吞吐量和能源效率提高多达335％。

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