began architecture overview

- created figure of mapping between ETSI-ITS and OSI layers
- struggling with LaTeX figures

main.tex

@@ -14,6 +14,19 @@
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+\ifluatex
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@@ -135,11 +148,22 @@ Networks, Intelligent transportation systems, Security, Mesh networks, Privacy
 
 \subsection{ITS Architecture}
 
-This section gives a brief overview of the ETSI architecture for Intelligent Transport Systems. It isn't meant to be elaborate but has a focus on identifiers and other message contents allowing linkability of messages.
+This section gives a brief overview of the ETSI architecture for Intelligent Transport Systems.  It isn't meant to be elaborate but has a focus on identifiers and other message contents allowing linkability of messages.
 
-The overall architecture of ITS stations according to the ETSI reference architecture
+The overall architecture of ITS stations according to the ETSI reference architecture \cite{europeantelecommunicationsstandardsinstituteetsiETSI3026652010} is mostly based on the well-known OSI layer model.  
 
-\cite{europeantelecommunicationsstandardsinstituteetsiETSI3026652010}
+\begin{figure}
+% center graphic
+\centering
+\includegraphics[width=0.8\textwidth]{figures/etsi-its-architecture.png}
+\caption{The ETSI ITS-station reference architecture, based on \cite{europeantelecommunicationsstandardsinstituteetsiETSI3026652010}}
+\label{fig:etsi-its-arch}
+\end{figure}
+
+OSI layers 1 and 2 are combined into the \textit{Access} layer, OSI layers 3 and 4 into the \textit{Networking \& Transport} layer and OSI layers 5, 6 and 7 are put into the \textit{Facilities} layer (see Fig. \ref{fig:etsi-its-arch} ). \\
+The two vertical \textit{Management} and \textit{Security} layers provide supporting functionality throughout the whole stack. \textit{Applications} make use of the ITS-station services and thus sit on top of it all.
+
+Designed for modularity, the ETSI ITS architecture allows for a big number of access protocols. Similarly, a great variety of applications can run on top of the stack. Because of that variety, these two layers are considered out-of-scope of this survey.
 
 % \nocite{european_telecommunications_standards_institute_etsi_etsi_2010}