A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum

Zhenghang ZHU; Jianxin JIA; Zhenhong LI; Hua QIAN; Kai KANG

doi:10.11999/JEIT190515

Volume 42 Issue 11

Nov. 2020

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Article Navigation > Journal of Electronics & Information Technology > 2020 > 42(11): 2680-2688

Zhenghang ZHU, Jianxin JIA, Zhenhong LI, Hua QIAN, Kai KANG. A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum[J]. Journal of Electronics & Information Technology, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515

Citation:

Zhenghang ZHU, Jianxin JIA, Zhenhong LI, Hua QIAN, Kai KANG. A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum[J]. Journal of Electronics & Information Technology, 2020, 42(11): 2680-2688. doi: 10.11999/JEIT190515

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A Low Latency Random Access Mechanism for 5G New Radio in Unlicensed Spectrum

doi: 10.11999/JEIT190515

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)

Received Date: 2019-07-10
Rev Recd Date: 2020-03-07

Available Online: 2020-04-02

Publish Date: 2020-11-16

Abstract

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.
- 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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References(13)

References

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