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Performance Analysis of HARQ in 2-step RACH Procedure Using Markov Chain Model

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Advances on Broad-Band Wireless Computing, Communication and Applications (BWCCA 2022)

Part of the book series: Lecture Notes in Networks and Systems ((LNNS,volume 570))

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Abstract

A bit error may occur when data is transmitted in the 5G/6G cellular system. Hybrid Automatic Repeat and reQuest (HARQ) for an error correction and retransmission method is being applied as an error control method to solve this problem. Bit errors can also occur during the MsgA transmission process for the initial connection of the 2-step RACH procedure, a random access method announced in Release 16 of the 3GPP. However, HARQ is not currently applied in the MsgA transmission process. In this paper, we propose a method that applies HARQ to the MsgA transmission process to improve the initial connection of the 2-step RACH procedure. We analyze the transmission process using analytical Markov Chain Model. For performance analysis, the performance of the HARQ-applied method is compared to the performance of the existing transmission method. As a result of comparative analysis, in the case of 256QAM, the HARQ-applied method at saturation of −6 dB increased by about 61% compared to the existing method.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded and Institute for Information & communications Technology Planning & Evaluation(IITP) by the Korea government (MSIT)(No. 2022R1A2C2005705, AI-MAC Protocol on Distributed Machine Learning for Intelligent Flying Base Station, No. 2021-0-00368, Development of the 6G Service Targeted AI/ML-based autonomous-Regulating Medium Access Control (6G STAR-MAC)).

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Correspondence to Hyunhee Park .

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Kim, B., Park, H. (2023). Performance Analysis of HARQ in 2-step RACH Procedure Using Markov Chain Model. In: Barolli, L. (eds) Advances on Broad-Band Wireless Computing, Communication and Applications. BWCCA 2022. Lecture Notes in Networks and Systems, vol 570. Springer, Cham. https://doi.org/10.1007/978-3-031-20029-8_14

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  • DOI: https://doi.org/10.1007/978-3-031-20029-8_14

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  • Print ISBN: 978-3-031-20028-1

  • Online ISBN: 978-3-031-20029-8

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