非授权频段中LTE和Wi-Fi共存系统性能研究

为了应对移动数据日益增长的需求,3GPP(3rd Generation Partnership Project)对LTE(Long Term Evolution)扩展到非授权频段展开了相关讨论。LAA(Licensed-Assisted Access),亦称为LTE-U(Unlicensed LTE),与目前已经运行在5GHz非授权频段上的其他无线接入技术(如Wi-Fi)的共存问题,成为了研究的焦点。本文主要研究了在非授权频段上运行LTE和Wi-Fi系统共存的机制,设计实现了基于LAA和Wi-Fi共存场景的系统级仿真平台。仿真结果表明,在非授权频段上LAA能与Wi-Fi和谐共存。针对LAA系统设计一种合理的退避机制,能够同时提升LAA和Wi-Fi系统的吞吐量,提高资源分配的公平性和使用效率。

Performance Evaluation of LTE and Wi-Fi Coexistence in Unlicensed Bands

In response to the growing demand for mobile data, 3GPP (3rd Generation Partnership Project) consider the operation of the Long Term Evolution (LTE) systems in the unlicensed spectrum. LAA (Licensed-Assisted Access), also known as LTE-U (Unlicensed LTE), coexist with other wireless access technologies (such as Wi-Fi), which has become the focus of the research. This paper mainly studies the coexistence mechanism of running LTE and Wi-Fi system simultaneously in the unlicensed frequency bands and achieves the system-level simulation. The simulation results show that LAA can be in harmony with Wi-Fi in the unlicensed bands. To design a reasonable retreat mechanism on LAA system, can simultaneously improve the throughput of LAA and Wi-Fi system, and also improve resource allocation fairness and efficiency.