Provisioning QoS in Wi-Fi Systems With Asymmetric Full-Duplex Communications
Provisioning QoS in Wi-Fi Systems With Asymmetric Full-Duplex Communications
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DOI：
10.1109/tccn.2018.2878222
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发表时间：
2018-10
影响因子：
8.6
通讯作者：
Mohammed Hirzallah;Wessam Afifi;M. Krunz
中科院分区：
文献类型：
--
作者：
Mohammed Hirzallah;Wessam Afifi;M. Krunz
无线局域网（wlan）承载的业务量持续快速增长。全双工通信是满足WLAN用户日益增长的业务需求、提高频谱效率和降低时延的关键解决方案。本文以Wi-Fi系统为例，研究了非对称全双工（AFD）通信在无线局域网中的应用。我们的系统模型依赖于一个全双工Wi-Fi接入点，同时将上行链路和下行链路传输到一对半双工Wi-Fi站。在具有AFD通信能力的无线局域网中，由于节点间和残留的自干扰，提供QoS保证是具有挑战性的。配对上行和下行站之间QoS需求的异构性进一步使问题复杂化。为了应对这些挑战，我们引入了一个名为AFD-QoS的框架，该框架将AFD通信整合到wlan中并支持QoS。AFD-QoS由三个部分组成：1)支持afd的上行/下行站对选择算法；2)支持afd的块确认会话启动/终止协议；3)联合传输速率/AFD通信模式适配方案。我们的自适应方案依赖于智能和认知方法来提高Wi-Fi网络对信道动态以及节点间和自干扰的感知。我们介绍了新的智能mac层程序，以支持AFD通信中的QoS服务，并阐明了许多挑战及其解决方案。我们的仿真结果表明，AFD- qos优于经典的半双工框架，可达到90%的最佳AFD性能。
The traffic volume carried by wireless local area networks (WLANs) continues to increase at a rapid pace. Full-duplex communication is a key solution for satisfying the growing traffic demand, enhancing spectrum efficiency, and reducing latency for WLAN users. In this paper, we consider the application of asymmetric full-duplex (AFD) communications in WLANs, exemplified by a Wi-Fi system. Our system model relies on a full-duplex-enabled Wi-Fi access point to simultaneously transmit uplink and downlink to a pair of half-duplex Wi-Fi stations. Providing QoS guarantees in WLANs with AFD communication capabilities is challenging due to inter-node as well as residual self-interference. The heterogeneity of the QoS requirements between paired uplink and downlink stations further complicates the problem. To tackle these challenges, we introduce a framework called AFD-QoS, which incorporates AFD communications in WLANs and supports QoS. AFD-QoS consists of three components: 1) AFD-enabled uplink/downlink station-pair selection algorithm; 2) AFD-enabled block-acknowledgment session initiation/termination protocol; and 3) joint transmission rate/AFD communication mode adaptation scheme. Our adaptation scheme relies on intelligent and cognitive approaches to improve Wi-Fi networks awareness about channel dynamics as well as inter-node and self-interference. We introduce new intelligent MAC-layer procedures for supporting QoS services in AFD communications, and cast light on many challenges and their solutions. Our simulation results indicate that AFD-QoS outperforms classical half-duplex frameworks and achieves up to 90% of the optimal AFD performance.