NR Sidelink Enhancement in 3GPP Release 17




NR Sidelink, Inter-UE coordination, SL DRX, UE to UE Relay


3GPP is currently studying enhancements to Sidelink (SL) operations for 5G New Radio (NR) in a Release 17 Work Item which is planned to be finished by end of 2021. The NR Sidelink (SL) Work Item in Release 17 includes several key features targeting reliability enhancements, power saving and coverage enhancements by expanding the scope of NR sidelink to target V2X, commercial D2D use-case and Public safety. This paper provides an insight on the current 3GPP Release 17 NR SL design describing necessary enhancements in the physical, protocol layer to support inter-UE coordination message for reliability enhancement for autonomous resource selection procedure by providing feedback on the half-duplex, persistent collision and hidden nodes. In addition, the power saving feature is addressed by introducing a SL DRX mechanism for the PC5 interface which defines active reception and transmission periods between a TX and the peer Rx UE(s) and also between Tx UE and gNB. Furthermore, this paper outlines details on the Sidelink Relay feature for coverage enhancement by describing possible solutions for UE to Network relay and UE to UE relay.


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Author Biographies

Karthikeyan Ganesan, Lenovo, Oberursel, Germany

Karthikeyan Ganesan received MSC in Information Technology and communication engineering from the Tampere University of Technology, Finland in 2012. His previous work experience includes Layer1 firmware developer for GSM/EGPRS, LTE in various companies like Aricent, ST-Ericsson, CommAgility He started contributing to the 5G research at Huawei-Munich Research centre, Germany from 2015. Since 2019, he joined Lenovo Germany as member of the research and technology team, representing Lenovo/Motorola Mobility in the 3GPP RAN1 working group. His current focus area is NR-Sidelink design for vehicular communication and Industrial IOT.

Prateek Basu Mallick, Lenovo, Oberursel, Germany

Prateek Basu Mallick received his MBA from Indian Institute of Management Bangalore, India in 2011. He started working with Hughes Software Systems, Gurgaon in 2000 after completing his engineer in Electronics and Telecommunication area. He later moved to Samsung India in 2004 where among other responsibilities he was involved in the commercialization aspects of many Samsung phone models and represented Samsung in 3GPP RAN2 until 2012. His focus areas are control plane and user plane aspects in features like Dual Connectivity, Carrier Aggregation, Vehicular and Sidelink communication etc. Since 2017, he is working in Lenovo Germany as a member of the research and technology team, representing Lenovo/Motorola Mobility in the 3GPP RAN2 and participating in other standards forum.

Joachim Löhr, Lenovo, Oberursel, Germany

Joachim Löhr received his diploma degree in information technology and communications engineering from the Technical University of Darmstadt, Germany in 2002. Afterwards he joined the Panasonic R&D Centre Germany with focus on 3GPP standardization, mainly in the Radio Access Network working groups. From the beginning, he was a permanent member of the Panasonic 3GPP RAN1/2 delegation also later leading the Panasonic RAN2 delegation in the standard meetings. He was actively contributing to various topics from UMTS/HSPA (Rel-6/7) to the current 5G system (Rel-15). Since 2017, he joined Lenovo Germany as member of the research and technology team, representing Lenovo/Motorola Mobility in the 3GPP RAN2 working group. His current focus areas are operation in shared spectrum channel access, Industrial IOT and vehicular communication.


K. Ganesan, P.B. Mallick, J. Löhr, D. Karampatsis, A. Kunz, “5G V2X Architecture and Radio Aspects”, 2019 IEEE Conference on Standards for Communications and Networking (CSCN), October 2019.

K. Ganesan, J. Löhr, P.B. Mallick, A. Kunz, R. Kuchibhotla, “NR Sidelink Design Overview for Advanced V2X Service”, IEEE Internet of Things Magazine (Volume: 3, Issue: 1, March 2020).

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Gaurang Naik, Biplav Choudhury, Jung-Min Park, “IEEE 802.11bd & 5G NR V2X: Evolution of Radio Access Technologies for V2X Communications”, IEEE Access, May 2019.

3GPP TS 22.186 “Enhancement of 3GPP support for V2X scenarios,” v16.1, Dec. 2018.

3GPP TS 23.285 “Architecture enhancements for V2X services,” v15.0.0, Mar. 2018.






5G Enhancements