贾建鑫1,
郦振红2,
钱骅1,
康凯1,,
1.中国科学院上海高等研究院 上海 201210
2.TCL通讯科技控股有限公司 深圳 518057
基金项目:国家科技重大专项(2017ZX03001019)；国家自然科学基金(61671436)
详细信息
作者简介:朱正航：男，1982年生，高级工程师，研究方向为5G、软件定义无线电
贾建鑫：男，1988年生，助理工程师，研究方向为LTE与5G系统
郦振红：女，1977年生，博士，研究方向为5G标准化
钱骅：男，1976年生，研究员，博士生导师，研究方向为无线通信、非线性信号处理、大数据信号处理
康凯：男，1977年生，正高级工程师，硕士生导师，研究方向为下一代无线通信系统、5G、Wi-Fi系统
通讯作者:康凯 kangk@sari.ac.cn
中图分类号:TN929.5计量
文章访问数:1761
HTML全文浏览量:756
PDF下载量:75
被引次数:0
出版历程
收稿日期:2019-07-10
修回日期:2020-03-07
网络出版日期:2020-04-02
刊出日期:2020-11-16
A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum
Zhenghang ZHU1,Jianxin JIA1,
Zhenhong LI2,
Hua QIAN1,
Kai KANG1,,
1. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
2. TCL Communication Technology Holdings Limited Company, Shenzhen 518057, China
Funds:The National Science and Technology Major Project (2017ZX03001019), The National Natural Science Foundation of China (61671436)
摘要
摘要:针对5G非授权频段通信(NR-U)场景，该文提出一种新型的低时延随机接入机制。该机制分别在随机接入回复窗口(RARW)与竞争窗口中加入了信道空闲计时器，来减少UE因在非授权频段进行竞争接入所引起的时延；此外该机制还加入了请求发送/允许发送机制，来解决隐藏节点对随机接入过程的影响。该机制可降低传统机制中由于未考虑非授权频段特性及隐藏节点问题所引起的随机接入时延问题。该文首先对NR-U场景中的传统随机接入机制进行分析并进行问题定位；其次，提出新型随机接入机制的网络实体交互流程，建立新型机制与传统机制中的网络实体交互时序模型；最后以数学推导和仿真的方法对新型机制与传统机制进行对比评估，相关结果显示出新型机制在平均耗时方面的优势。
关键词:5G非授权频段通信/
随机接入过程/
信道空闲计时器/
隐藏节点/
请求发送/允许发送机制
Abstract:For the 5G New Radio in Unlicensed (NR-U) spectrum scenario, a novel random access mechanism is proposed, which first adds the channel idle timer in Random Access Response Window (RARW) and contention resolution window to reduce the accessing delay caused by the contention-based accessing and employs the Request To Send/Clear To Send (RTS /CTS) mechanism to address the hidden node issue. The mechanism can alleviate the latency incurred by the legacy mechanism which did not consider the intrinsic attribute of unlicensed band and the hidden node problem. Specifically, the legacy random access mechanism applied to NR-U is analyzed. Then, the detailed elaboration of the network entity interaction sequence defined in novel mechanism is proposed. Finally, the performance evaluation processes are carried out in the way of mathematical modeling and experimental simulation, and the analysis result demonstrates that the novel scheme outperforms the benchmark one in the respect of the average random access delay.
Key words:5G New Radio in Unlicensed (NR-U) spectrum/
Random access process/
Channel idle timer/
Hidden node/
Request To Send/Clear To Send (RTS/CTS) mechanism
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https://jeit.ac.cn/article/exportPdf?id=cb578bbb-5104-4915-b681-80392a5ac19b
