LTE使用未授权频段的方法研究

摘要

The introduction of LTE technology into the unlicensed band is one of the methods to solve the spectrum resource constraints of cellular systems.Describe the coexistence challenges that LTE introduces into unlicensed bands.In this paper, an enhanced FBE (E-FBE) structure is proposed for the LTE with FBE structure in LBT strategy to achieve the coexistence of fewer interception channel opportunities and fixed listening position.The structure introduces a random backoff procedure that allows LTE to listen for channels more flexibly based on the channel state.The simulation results show that, when WIFI and LTE coexist, this structure can solve the problem of LTE suppressed throughput and realize harmonious coexistence.%将LTE技术引入到未授权频段是解决蜂窝系统频谱资源紧张的方法之一.首先阐述LTE引入到未授权频段所存在的共存挑战,针对LTE利用LBT策略中的FBE结构实现共存所存在的侦听信道机会少且侦听位置固定的缺陷,提出一种增强型FBE(E-FBE)结构.该结构引入随机退避过程,可以让LTE依据信道状态更加灵活地侦听信道.仿真结果表明该结构可以解决WIFI在与LTE共存时被LTE压制吞吐量的问题,实现和谐共存.