ZTE

ZTE Communications ›› 2018, Vol. 16 ›› Issue (3): 40-44.DOI: 10.19729/j.cnki.1673-5188.2018.03.007

• Research Paper • Previous Articles     Next Articles

Mechanism of Fast Data Retransmission in CU-DU Split Architecture of 5G NR

HUANG He, LIU Yang, LIU Zhuang, HAN Jiren, GAO Yin   

  1. ZTE R&D Center, Shanghai 201203, China
  • Online:2018-08-25 Published:2020-03-18
  • About author:HUANG He (huang.he4@zte.com.cn) received the bachelor’s degree in computer science and technology from Shanghai Jiao Tong University, China in 2004. He is currently the chief engineer of wireless innovation laboratory of ZTE Corporation and leads the research and standardization work on 5G RAN. He has filed more than 60 patents. He was the rapporteurs of multiple CCSA/3GPP SIs/WIs and the editors of the related protocols.|LIU Yang (liu.yang31@zte.com.cn) received the Ph.D. degree in communication and information systems from Beijing University of Posts and Telecommunications (BUPT), China in 2016. He was a visiting scholar at Department of Electrical and Computer Engineering of North Carolina State University, USA from 2013 to 2015. He is currently a 5G research engineer at ZTE R&D center, Shanghai. His research interests include 5G wireless communications and signal processing.|LIU Zhuang (liu.zhuang2@zte.com.cn) received the master’s degree in computer science from Xidian University, China in 2003. He is currently a senior 5G research engineer at ZTE R&D center, Shanghai. His research interests include 5G wireless communications and signal processing.|HAN Jiren (han.jiren@zte.com.cn) received the master’s degree in wireless communication systems from University of Sheffield, UK in 2016. He is an advanced research engineer at the Algorithm Department, ZTE Corporation. His research interests include 5G wireless communications and signal processing.|GAO Yin (gao.yin1@zte.com.cn) received the master’s degree in circuit and system from Xidian University, China in 2005. Since 2005 she has been with the research center of ZTE Corporation and been engaged in the study of 3G/4G/5G technology. She has authored or co-authored about hundreds of proposals for 3GPP meetings and journal papers in wireless communications and has filed more than 100 patents. She was the rapporteurs of multiple 3GPP WIs. From August 2017, she has been elected as the vice chairman of 3GPP RAN3.

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Abstract:

The 5G radio access network (RAN) architecture is supposed to be split into the central unit (CU) and the distributed unit (DU) in order to support more flexible transport networks and provide enhanced user experience. However, such functional split may also introduce some new technical issues. In this paper, we study the data fast retransmission issue introduced by this functional split in different scenarios and solutions are provided to handle this issue. With the fast data retransmission mechanism proposed in this paper, the retransmitted data packets could be identified and handled with high priority. In this way, the data delivery between the CU and DU in 5G RAN is assured.

Key words: 5G RAN, central unit, distributed unit, fast retransmission