LiFi网络中基于反馈缩减的双向用户吞吐量最大化
Bidirectional User Throughput Maximization Based on Feedback Reduction in LiFi Networks
摘要：
基于反馈的信道自适应信令可以导致几乎任何性能度量增强。与射频（RF）信道不同，光无线通信（OWC）信道是相当静态的。该特征通过减少反馈量来实现双向用户吞吐量的潜在改进。光保真（LiFi）是OWC的一个子集，它是一种双向、高速和全网络化的无线通信技术，其中可见光和红外分别用于下行链路和上行链路。本文提出了两种用于减少LiFi蜂窝网络中的反馈量的技术，i）基于减少反馈信息的内容的有限内容反馈（LCF）方案和ii）基于更新间隔方案的有限频率反馈（LFF），该更新间隔方案让接收器在一些数据帧传输之后发送反馈信息。此外，基于随机航路点（RWP）移动性模型，最佳更新间隔，提供最大的双向用户设备（UE）的吞吐量，已被导出。结果表明，所提出的方案可以实现更好的平均总吞吐量相比，基准的一位反馈和全反馈机制。
英文摘要：
Channel adaptive signalling, which is based on feedback, can result in almost any performance metric enhancement. Unlike the radio frequency (RF) channel, the optical wireless communications (OWCs) channel is fairly static. This feature enables a potential improvement of the bidirectional user throughput by reducing the amount of feedback. Light-Fidelity (LiFi) is a subset of OWCs, and it is a bidirectional, high-speed and fully networked wireless communication technology where visible light and infrared are used in downlink and uplink respectively. In this paper, two techniques for reducing the amount of feedback in LiFi cellular networks are proposed, i) Limited-content feedback (LCF) scheme based on reducing the content of feedback information and ii) Limited-frequency feedback (LFF) based on the update interval scheme that lets the receiver to transmit feedback information after some data frames transmission. Furthermore, based on the random waypoint (RWP) mobility model, the optimum update interval which provides maximum bidirectional user equipment (UE) throughput, has been derived. Results show that the proposed schemes can achieve better average overall throughput compared to the benchmark one-bit feedback and full-feedback mechanisms.
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