NR Sidelink Enhancement in 3GPP Release 17
Keywords: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.
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).
S. Husain, A. Kunz, A. Prasad, K. Samdanis, J. Song, “Overview of 3GPP Standards for Vehicle-to-Everything”, IEEE Conference on Standards for Communications and Networking (CSCN), September 2017.
W. Anwar, A. Traßl, N.Franchi, G. Fettweis, “On the Reliability of NR-V2X and IEEE 802.11bd”, 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), September 2019.
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.