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IEEE 802.11ac DBCA: A Tug of War Between Channel Utilization and Fairness

机译：IEEE 802.11ac dbca：渠道利用率和公平之间的一场战争

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IEEE 802.11ac supports Dynamic Bandwidth Channel Access (DBCA), where a wireless station dynamically selects the channel bandwidth based on the availability of the secondary channels. Although DBCA reduces the possibility of starvation due to non-availability of secondary channels, however, to the best of our knowledge, no existing works look into the performance benefits of IEEE 802.11ac DBCA based on theoretical modeling. In this paper, we develop a two dimensional Markov chain approach to model the performance of DBCA under various channel bonding conditions. We validate the proposed model based on a real testbed implementation. From the thorough analysis of the numerical results obtained from the model, we show that although DBCA improves channel utilization for secondary channels, it requires proper channel allocations and bonding level distributions across the wireless channels for reducing unfairness in the network. We observe that under certain circumstances, the secondary channel users can affect the throughput of primary channel users, which may introduce a short-term unfairness and a significant performance drop in the network.
机译：IEEE 802.11ac支持动态带宽信道访问（DBCA），其中无线站基于辅信道的可用性动态地选择信道带宽。虽然DBCA由于次要渠道的不可用性而降低了饥饿的可能性，但是，据我们所知，没有现有的作品基于理论建模的IEEE 802.11ac DBCA的性能优势。在本文中，我们开发了一种二维马尔可夫链方法，以在各种信道键合条件下模拟DBCA的性能。我们基于实际测试平台实现验证所提出的模型。从彻底分析从模型中获得的数值结果，我们表明，尽管DBCA提高了辅助信道的信道利用率，但它需要跨无线信道的适当信道分配和键合级别分布，以减少网络中的不公平性。我们观察到，在某些情况下，辅助通道用户可能会影响主要信道用户的吞吐量，这可能会引入网络中的短期不公平性和网络中的显着性能下降。

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