5G 시스템에서 프리엠블 사용 방식에 따른 2-단계 랜덤 액세스의 지연시간 분석
Latency Evaluation of Two-Step Random Access Based on Preamble Usage in 5G System
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초록
In this study, we numerically evaluate the delay time characteristics of a two-step random access (RA) process proposed in the 5G standard. The 5G RA process comprises two RA stages, i.e., if the MsgA process fails a certain number of times in the two-step RA process, then it proceeds to the four-step RA process. Whereas the latency of the two-step RA is investigated more frequently compared with the four-step RA, the combination of two- and four-step RA operations has not been investigated. Therefore, in this study, we design a delay time analysis model by introducing the cumulative number of failures as an analysis parameter in a 5G two-step RA process. The 5G RA process uses 64 preambles to mitigate the RA collision probability. We evaluate the performance of the combined 5G RA process via two approaches, i.e., sharing 64 preambles and separating the preambles between two- and four-step RA processes. Results show that the preamble sharing method exhibits better delay time characteristics than the preamble separation method in the combined 5G RA process.
Abstract
In this study, we numerically evaluate the delay time characteristics of a two-step random access (RA) process proposed in the 5G standard. The 5G RA process comprises two RA stages, i.e., if the MsgA process fails a certain number of times in the two-step RA process, then it proceeds to the four-step RA process. Whereas the latency of the two-step RA is investigated more frequently compared with the four-step RA, the combination of two- and four-step RA operations has not been investigated. Therefore, in this study, we design a delay time analysis model by introducing the cumulative number of failures as an analysis parameter in a 5G two-step RA process. The 5G RA process uses 64 preambles to mitigate the RA collision probability. We evaluate the performance of the combined 5G RA process via two approaches, i.e., sharing 64 preambles and separating the preambles between two- and four-step RA processes. Results show that the preamble sharing method exhibits better delay time characteristics than the preamble separation method in the combined 5G RA process.
참고문헌 (14)
- "3GPP; Technical Specification Group Services and System Aspects; Release 16 Description; Summary of Rel-16 Work Items", 3rd Generation Partnership Project, ~ (2020)
- H. Y. Lee, "The Features and Future Prospects of 3GPP 5G", Proceedings of Symposium of the Korean Institute of communications and Information Sciences, pp.1224~1225 (2018)
- Dahlman, Erik, "5G NR : The next generation wireless access technology" (2020), Academic Press
- "3GPP; Technical Specification Group Radio Access Network; NR; Medium Access Control (MAC) protocol specification (Release 16)", 3rd Generation Partnership Project, ~ (2021)
- Zaidi, Ali, "5G Physical Layer: principles, models and technology components" (2018), Academic Press
- J. Choi, "Performance Analysis of 2-Step Random Access With CDMA in Machine-Type Communication", IEEE Transactions on Communications, 69(4), pp.2387~2397 (2021)
- J. Choi, "On Fast Retrial for Two-Step Random Access in MTC", IEEE Internet of Things Journal, 8(3), pp.1428~1436 (2021)
- J. Kim, "Two-Step Random Access for 5G System : Latest Trends and Challenges", IEEE Network, 35(1), pp.273~279 (2021)
- "Further discussion and evaluations for 2-step RACH", 3rd Generation Partnership Project, ~ (2019)
- Z. Li, "On Contention-based 2-step Random Access Procedure", 2020 International Conference on Wireless Communications and Signal Processing (WCSP), pp.771~776 (2020)
- Hyun-Yong Hwang, "Random Access Method with Prioritized RACH Preamble Allocation Scheme", Proceedings of Symposium of the Korean Institute of communications and Information Sciences, pp.1345~1346 (2017)
- Wong, Vincent WS, "Key technologies for 5G wireless systems" (2017), Cambridge university press
- Hyojin Lee, "Latency Evaluation of Access Structure at 2-Step RACH in 5G System", 2021 Proceedings of Korea Institute of Military Science and Technology, pp.985~986 (2021)
- Oliver C. Ibe, "Fundamentals of Applied Probability and Random Processes" (2014), Academic Press