Fix images and docs links in E1AP documentation

doc/E1AP/E1-design.md

@@ -169,9 +169,9 @@ sudo ./nr-uesoftmodem -r 106 --numerology 1 --band 78 -C 3619200000 --rfsim --sa
 
 You can also run the nodes on different machines. If you do so please change the interface parameters accordingly and make sure the interfaces are reachable. Please refer to the following figure for an overview of all parameters.
 
-![E1/F1/NG parameters](images/e1-archi.png){width=1200}
+![E1/F1/NG parameters](./images/e1-archi.png){width=1200}
 
-[PDF version](images/e1-archi.pdf) | [LaTeX/TikZ version](img/e1-archi.tex) if you want to modify to reflect your setup
+[PDF version](./images/e1-archi.pdf) | [LaTeX/TikZ version](./images/e1-archi.tex) if you want to modify to reflect your setup
 
 # 4. Multiple CU-UP
 

doc/E1AP/images/e1-archi.tex

@@ -0,0 +1,73 @@
+\documentclass{standalone}
+%\usepackage[tt=false]{libertine}
+\renewcommand{\familydefault}{\sfdefault}
+% improve for some encodings
+\usepackage{textcomp}
+\usepackage{tikz}
+\usetikzlibrary{positioning}
+\usetikzlibrary{shapes.symbols}
+\usetikzlibrary{decorations.markings}
+\usetikzlibrary{fit}
+
+\tikzset{splitpos/.store in=\splitpos,splitpos=0.5}
+\newcommand{\ip}[1]{\texttt{#1}}
+
+\begin{document}
+\begin{tikzpicture}
+  [
+    font=\scriptsize,
+    node distance=1.5cm and 3.2cm,
+    entity/.style={
+      rectangle,
+      draw,
+      inner sep=0pt,
+      minimum height=6mm,minimum width=11mm,
+      align=center
+    },
+    split/.style={postaction={%
+                      decorate,
+                      decoration={
+                          markings,mark={
+                            at position \splitpos
+                            with {
+                              \draw (0pt,2.5pt) -- (0pt,-2.5pt);
+                            }
+                          }
+                        }
+                      }
+                    },
+    ip/.style={font=\tiny,outer sep=1pt,inner sep=1pt},
+  ]
+  \node[entity]                      (cu-cp) {CU-CP};
+  \node[entity,below=of cu-cp]       (cu-up) {CU-UP};
+  \node[entity,below left=0.45cm and 3.2cm of cu-cp]  (du)  {DU};
+  \node[entity,right=of cu-cp] (amf) {AMF};
+  \node[entity,right=of cu-up] (upf) {UPF};
+
+  \draw[split,splitpos=0.5] (cu-cp) --
+      node[ip,at start, below right, align=left] {\ip{GNB\_IPV4\_ADDRESS\_FOR\_NG\_AMF:38412}}
+      node[above] {NG-C/N2}
+      %node[ip,at end, below left] {127.0.1.10/24}
+        (amf);
+  \draw[split,splitpos=0.5] (cu-up) --
+      node[ip, at start, below right,align=left] {\ip{GNB\_IPV4\_ADDRESS\_FOR\_NGU:2152}}
+      node[above] {NG-U/N3}
+      %node[ip, at end, below left] {127.0.1.10/24}
+        (upf);
+  \draw[split,splitpos=0.5] (cu-cp) --
+      node[ip, at start, below right] {\ip{ipv4\_cucp:38462}}
+      node[right] {E1AP}
+      node[ip, at end, above right] {\ip{ipv4\_cuup:38462}}
+        (cu-up);
+  \draw[split] (du.north east)   --
+      node[ip, at start, below right] {to \ip{remote\_n\_address:38472}}
+      node[above] {F1-C}
+      node[ip, at end, above left, align=right] {\ip{local\_s\_address:38472}}
+        (cu-cp);
+  \draw[split] (du.south east)   --
+      node[ip, at start, above right] {to \ip{remote\_n\_address:remote\_n\_portd}}
+      node[above] {F1-U}
+      node[ip, at end, below left, align=right] {\ip{local\_s\_address:local\_s\_portd}}
+        (cu-up);
+\end{tikzpicture}
+\end{document}