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)

서지정보

· 발행기관 : 국방기술품질원
· 수록지 정보 : 국방품질연구논집(JDQS) / 6권 / 1호 / 126 ~ 135페이지
· 저자명 : 이효진, 이종관, 임재성

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.

영어초록

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.

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