电信科学 ›› 2016, Vol. 32 ›› Issue (4): 114-125.doi: 10.11959/j.issn.1000-0801.2016086
赵思聪,黄磊,申滨,黄晓舸
出版日期:
2016-04-20
发布日期:
2016-04-28
基金资助:
Sicong ZHAO,Lei HUANG,Bin SHEN,Xiaoge HUANG
Online:
2016-04-20
Published:
2016-04-28
Supported by:
摘要:
LTE-U(LTE in unlicensed spectrum)是近来3GPP 标准化组织讨论研究的用于缓解授权频段通信压力的新兴技术。首先对LTE-U技术进行概述,随后分析了LTE-U的工作频谱和设计要求,同时总结了其可能的部署场景和运行模式,然后对部署LTE-U存在的难点和现有的应用解决方案的相关研究进行了详细阐述,最后对未来的研究方向进行了展望。
赵思聪,黄磊,申滨,黄晓舸. LTE-U:未来移动通信系统发展的助推剂[J]. 电信科学, 2016, 32(4): 114-125.
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.
表1
LTE-U与Wi-Fi共存方案优劣势对比"
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 | 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 | 自行选择最小干扰的信道进行数据传输 | 低 | - | 高 | ||
LTE带宽配置 | 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 | 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 | 现有标准下通过配置LTE子帧即可实现共存 | 低 | 低 | 中 | ||
ABS | 完全利用现有技术实现,通过配置ABS即可 | 低 | 低 | 中 | ||
LAA-LBT | 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 | 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) | 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 | 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 | 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 |
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