Recent advances on WLAN technology have been focused mostly on boosting network capacity by means of a more efficient and flexible physical layer. A new concept is required at MAC level to exploit fully the new capabilities of the PHY layer. In this article, we propose a contention mechanism based on Repeated Contentions (ReCo) in frequency domain. It provides a simple-to-configure, robust and short-term fair algorithm for the random contention component of the MAC protocol. The throughput efficiency of ReCo is not sensitive to the number of contending stations, so that ReCo does not require adaptive tuning of the access parameters for performance optimization. Efficiency and robustness is gained through the power of repeated contention rounds. We also apply the ReCo concept to the emerging IEEE 802.11ax standard, showing how it can boost performance of random access with respect to the current version of IEEE 802.11ax OFDMA Back-Off (OBO). Our proposal is supported by an experimental test-bed that realizes ReCo by means of simultaneous transmission and reception of short tones, which is feasible on top of programmable OFDM PHY layers.

中文翻译：

---

“好重复”：通过重复争用使随机访问接近最佳

WLAN 技术的最新进展主要集中在通过更有效和灵活的物理层来提高网络容量。MAC 层需要一个新概念来充分利用 PHY 层的新功能。在本文中，我们提出了一种基于频域重复竞争 (ReCo) 的竞争机制。它为 MAC 协议的随机竞争组件提供了一种易于配置、健壮且短期的公平算法。ReCo 的吞吐量效率对竞争站点的数量不敏感，因此 ReCo 不需要自适应调整访问参数来优化性能。效率和稳健性是通过重复争用回合的力量获得的。我们还将 ReCo 概念应用于新兴的 IEEE 802.11ax 标准，展示了它如何能够相对于当前版本的 IEEE 802.11ax OFDMA Back-Off (OBO) 提高随机访问的性能。我们的提议得到了实验测试台的支持，该测试台通过同时发送和接收短音来实现 ReCo，这在可编程 OFDM PHY 层之上是可行的。