## 2 Review of Related Works and Analysis of Unsolved Problems
### Requirements for System Development
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Types of Sensors That Can** & & & \\
**Be Equipped in Vehicles** & **Types of Virtual Equipment** & **Types of Communication Network between Vehicles** & **Types of Roadside Units (RSUs)** \\ \hline Video cameras & Smartphone/Tablet & VANET & RSU for speed recognition \\ \hline GPS & Calendar & Services provided from ad-hoc nets & Dynamic RSU for traffic regulation \\ \hline Microphones & Reminder & Reminders & Dynamic info black-boards \\ \hline Movement dynamics & Information from social networks & V2V communication services & Monitoring and information about conditions of roads \\ \hline Sensors providing vehicle & & CARNET/TIR & WiMAX communication & Sensors for meteorological conditions \\ engine working parameters & mark equipment & & \\ and fuel assumptions & & & \\ \hline Power hit sensors & Documents about planned activities, changing of time scheduling, and primary plans & Wireless IEEE 802.11 (p), and 12 and higher infrastructures & Information regarding road directions, official repair works, etc. \\ \hline Temperature measurements & & DVB-RCST satellite & \\ (inside and outside of means of transport) & & communication and other possible wireless methods & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Types of sensors that can be equipped in means of transport and RSUs for contextual data assessment. about the vehicle environment. Data from other vehicles have mixed characters. Data flows from sensors are classified and passed from the _Subsystems of service support_ (Figure 1). The KB includes the multi-component structure as follows:  
* Computer-based ontology of the application domain of transportation;
* Rules of the management of transportation processes;
* Identification of important situations;
* Additional organization of decision support and control under the conditions of unexpected events. Any identified situation implies that a certain mechanism should be used for the different transmission of information. The _Subsystem of situation identification_ implies the provision of different services, which are selected using the capabilities of remote cloud service platforms. The subsystem of the service support interfaces is important, but we do not provide a detailed description of this component. For a more detailed description of the types of communication under analysis, the infrastructure of communication between vehicles and RSUs can consist of three areas: the INV relates to the communication of the local area of the vehicle, which involves the OBUs and several application units (AUs). The ad-hoc net area consists of cars equipped with OBU devices and that can communicate directly with each other, thus forming the MANET, i.e., mobile ad-hoc network, which ensures fully distributed decentralized communication. The OBU devices can be classified according to WAVE, and are usually placed in the car's local area and used for exchanging information between the RSU and other cars. The OBU has a _Resource Command Processor (RCP)_, which can explore the resources using read/write memory that is used for storing data in the DW. The OBU devices use interfaces that are dedicated to the type of communication that allows connection of the vehicle with network devices and other OBU devices using radio technology, by applying the IEEE 802.11p standard. Extra devices can implement other radio technologies, such as IEEE 802.11a/b/g/n/ac/ad. Mobile access protocols, such as 4G, 5G, and the upcoming 6G, can also be used, in addition to LTE, etc. The OBU devices can be connected to the RSUs or other OBUs via a wireless connection using the IEEE 802.11p channel for the radio frequency, which is responsible for communication with other OBU and RSU devices and provides communication services to the application device. The OBU provides the main functions of Wi-Fi access, ad-hoc and geo-location-based routing, network load management, reliable messaging, security, and IP mobility [21].