非授权频段LTE与WiFi的共存技术综述

Overview on Coexistence Technologies of Unlicensed Band LTE and WiFi

近年来,智能无线设备呈现爆炸性增长的趋势,但是频谱资源有限,逐渐无法满足人们日益增长的流量需求。非授权频段LTE技术被学术界和工业界视为缓解通信系统容量压力的关键技术之一,但当前非授权频段主要由WiFi技术使用。由于LTE和WiFi技术接入机制的不同,在非授权频段直接进行LTE通信势必会对WiFi网络产生不可忽视的影响。因此,非授权频段LTE技术首先要解决与WiFi的友好共存问题。主要概述了当前几种主要的非授权频段LTE技术的特点及发展现状,指出了各个非授权LTE技术的优缺点,同时总结未来研究中该技术可能的发展方向。

Smart wireless devices show an explosive growth trend in the recent years,but the limited spectrum resources are gradually unable to meet people's growing traffic demand.Unlicensed LTE(Long Term Evolution)technology is regarded by academia and industry as one of the key technologies to alleviate the capacity pressure of communication systems.However,the current unlicensed spectrum is mainly used by WiFi(Wireless Fidelity)technology.Due to the different access mechanisms of LTE and WiFi,LTE communication in unlicensed spectrum would inevitably have a non-negligible impact on WiFi network.Therefore,unlicensed LTE should firstly solve the problem of friendly coexistence with WiFi.This paper mainly summarizes the characteristics and development of several unlicensed LTE technologies,points out the advantages and disadvantages of each unlicensed LTE technology,and summarizes the possible development direction of unlicensed LTE technology in future research.