# Advancing C-V2X for Level 5 Autonomous Driving from the Perspective of 3 GPP Standards
## 3 Taxonomy of C-V2X Related 3 GPP Standard Documents
The design also dictates the fact that there exists dependency among technical documents. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Technology** & **Document** & & & & **Relense-14** & & **Relense-15** & & **Release-16** & & **Release-17** \\
**Categorization** & **ID** & & & **Version** & & **Year** & **Version** & **Year** & **Version** & **Year** & **Version** & **Year** \\ \hline TS 22.185 & Requirements for V2X Services & 14.4.0 & 2018-06 & 15.0.0 & 2018-06 & 16.0.0 & 2020-07 & \\ TS 22.285 & LTE support for V2X Services & 14.0.0 & 2015-12 & & & & & \\ TS 23.285 & Architecture enhancements for V2X Services & 14.9.0 & 2019-12 & 15.4.0 & 2019-12 & 16.4.0 & 2020-09 & \\ TS 23.759 & Application Layer for V2X Services & 14.0 & 2016-09 & & & & & \\ TS 24.385 & Management Object (MO) for V2X Services & 14.4.0 & 2018-09 & 15.1.0 & 2018-09 & 16.2.0 & 2020-09 & \\ TS 24.386 & Protocol Aspects for the V2X Control Function & 14.5.0 & 2020-06 & 15.3.0 & 2020-06 & 16.2.0 & 2020-12 & \\
**4G V2X** & TS 24.486 & Protocol Aspects for V2X Application Enbar (VAE) Layer Services & 15.2.0 & 2019-09 & 15.1.0 & 2019-09 & 16.0.0 & 2020-06 & \\ TS 25.387 & V2X Control Function to IRS Agents & 14.2.0 & 2019-09 & 15.1.0 & 2019-09 & 16.0.0 & 2020-06 & \\ TS 25.389 & Inter-V2 Control Function Signalling Aspects & 14.2.0 & 2019-09 & 15.1.0 & 2019-09 & 16.0.0 & 2020-06 & \\ TS 25.385 & Security Agents? Users Services & 14.1.0 & 2017-09 & & & & & \\ TS 36.786 & UE Radio Transmission and Reception for V2X & 14.0.0 & 2017-03 & & & & \\ TS 36.787 & New Band Combinations for V2X & & & & & & & \\ TS 36.788 & UE Radio Transmission and Reception for V2X & & & & & & & \\ TS 36.885 & LTE based V2X Services & & & & & & & \\ \hline TS 22.288 & Enhancement of V2X Services for 5G & & & & & & & \\ TS 23.286 & Functional Architecture and Information Flows for V2X & & & & & & & \\ TS 23.764 & Enhancements to Application Layer for V2X Services & & & & & & & \\
**4G \&** & & & & & & & & \\ \hline NAS-25G** & 16.2378 & Architecture Enhancements for V2X Services & & & & & & \\ NAS-25G & 16.2378 & and SCS & & & & & & & \\ V2X Services & TR 26.985 & Media Handling and Interaction for V2X & & & & & & \\ TS 29.46 & V2X Application Enbar (VAE) Services & & & & & & & \\ TS 33.318 & Security Agent for V2X Services & 14.1.0 & 2017-09 & 15.0.0 & 2018-06 & 16.0.0 & 2020-07 & \\ TS 33.536 & Security Aspects V2X Services & & & & & & & \\ TS 33.386 & Security Aspects V2X Services & & & & & & & \\ TS 37.875 & Band Combinations for V2X and current Operation & & & & & & & \\ \hline \hline \end{tabular}
\begin{tabular}{c c} **V2X** \\ **Senarios** \\ **and Use** \\ **Cases** \\ **and NR** \\ \end{tabular}
\end{table} 
Table 1: 3 GPP Standardization Support for C-V2X Services. The current version of the design is presenting the V2X services in three coordinates, and the future version of this research work may consider the exact positioning of technical documents over axes with some functions making a holistic approach for support categorization. So, another visualization can be provided by pointing out how much the documents contribute to other parts. Hence, we focused on creative and effective-to-understand support categorization design. The system support (SS) includes service  
Figure 3: System and Network Support for V2X Services. Figure 2: Evolution of 3 GPP’s Technical Specifications. requirements, architectural enhancements, application layer, security aspects, media handling & interaction, and other enhancements support for 4G and 5G V2X services. A total of 19 technical specifications and reports are produced for system support. Similarly, the core network (CN) support includes a control function, application server, application enabler, 5G system, UE policies, etc., for C-V2X services, and 10 technical documents are produced for CN support. Last but not least, the access network (AN) support includes band combination, RAN aspects, UE radio transmission & reception, etc., for 4G and 5G V2X services.