| Title |
An Analysis of 5G NR Uplink Data Throughput for Cellular V2X Application |
| DOI |
https://doi.org/10.5573/ieie.2022.59.2.14 |
| Keywords |
Cellular V2X; 5G NR; Throughput; Nemerology; DM-RS |
| Abstract |
C-V2X (cellular V2X) technology based on 5G NR (New Radio) is drawing attention as a core technology for autonomous driving or advanced driving services. In order to achieve autonomous driving beyond simple safe driving, stable data throughput at ultra-low latency and high moving speed must be ensured. When the moving speed of UE (User Equipment) is high, since the channel characteristics change rapidly, reliable communication in a time varying frequency selective fading environment must be achieved. In LTE or 5G NR standards, a demodulation reference signal (DM-RS) is transmitted and used for channel estimation at the receiving end. In order to cope with the high time variability of the channel, it is necessary to increase the DM-RS time density. In 5G-V2X, the DM-RS time density can be changed by setting sub-carrier spacing (SCS) in addition to the number of DM-RS symbols per subframe. Since the two parameters have different effects on system performance, it is necessary to find an appropriate combination according to the system operating environment. In this paper, assuming a service such as remote driving, the target data throughput of the uplink is set to 20 Mbps, and the system parameter setting criteria are found so that the target data throughput can be obtained in various environments. To this end, performance analysis was performed based on data throughput while changing the settings for SCS and DM-RS under various Doppler frequencies and channel delay spread conditions. Based on the analysis results, we propose a system setting method suitable for C-V2X operating conditions. |