LTE-U：未来移动通信系统发展的助推剂

doi:10.11959/j.issn.1000-0801.2016086

Abstract

Abstract:

Recently，a new technology called LTE-U proposed by 3GPP is under study. It aims to relieve the pressure in licensed spectrum. Firstly，an overview of LTE-U was presented，and then the working frequency spectrum and design principles were analyzed. The possible deployment scenarios and operation modes of LTE-U were also summarized. The difficulties in deploying LTE-U and existing solutions were discussed particularly. Finally，several possible future research directions of LTE-U were presented.

Key words: LTE, LTE-U, unlicensed band, co-existence

Sicong ZHAO,Lei HUANG,Bin SHEN,Xiaoge HUANG. LTE-U：the propellant for development of future mobile communication system[J]. Telecommunications Science, 2016, 32(4): 114-125.

Figures/Tables 18

References 28

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		LTE-U与Wi-Fi共存
类别	方案	优势	不足	复杂度	公平性	总效率
信道选择	CSAT^［17］	支持多信道跳转，有效避免干扰	部署密集的区域，没有空闲信道可用，此类方案局限性很强，需配合其他共存方案使用	中	-	高
	LCCS^［18］	自行选择最小干扰的信道进行数据传输		低	-	高
	LTE带宽配置^［18］	自行配置传输带宽大小，高效利用空闲信道		低	-	高
同信道共存	工作周期^［19］	现有标准即可实现，可动态调整信道占用时长	LTE 控制信道，公平性差。LTE-U恢复信道使用时，直接将Wi-Fi系统挤掉，系统间干扰较大	中	低	中
	LTE-muting^［12］	现有标准下通过配置LTE子帧即可实现共存		低	低	中
	ABS^［19］	完全利用现有技术实现，通过配置ABS即可		低	低	中
	LAA-LBT^［23］	引入LBT保证公平性，采用CA技术跨频段载波聚合	直接引入 LBT 机制没有考虑	高	中	中
	自适应LBT^［20］	多信道跳转避免长时间占用同一信道，能够动态调整占用信道时长，增加信道使用效率	随机退避，易发生数据分组碰撞，引起错误帧，影响系统性能	高	中	中
	同/异步LBT （带回退）^［22］	同步LBT兼容性强。异步LBT效率高，可用于不同的场景。加入随机退避降低数据分组碰撞概率	降低数据分组碰撞概率是以牺牲信道使用率为代价的	高	高	中
	CSMA/CA-LTE^［24］	采用CSMA/CA 协议，保证公平性，有效降低数据分组碰撞概率	退避增加了信道空闲时间，频谱效率不高	中	高	中
其他	上行功率控制^［25］	降低发射功率，从而有效降低系统间的干扰	发射功率低，系统性能较差	低	中	低

LTE-U：the propellant for development of future mobile communication system

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