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@@ -102,9 +102,15 @@
 \end{enumerate}
 \Aufgabe{Wi-Fi - CSMA/CA, RTS/CTS}{10+10+10}
 \begin{enumerate}
-    \item bla
-    \item bla
-    \item bla
+    \item In a wired network (e.g. Ethernet) the coliision detection is realized by sensing the carrier power and thus listen for another station sending over the same connection. In wireless networks there are no cables, just antennas which cannot simultaneously transmit and receive. The signal of a wireless device at transmission time is so strong that it will cover any other signal. Therefore there is no chance of detecting other signals possibly trying to use this connection. Furthermore it is possible that some stations are hidden (i.e. not in range) for some others, the AP cannot coordinate these participants because it simply does not know who is involved. (Hidden Station Problem)
+    \item The \textit{Hidden Station Problem} occurs when a node (here node \textbf{A} is in range (i.e. visible) from a wireless access point but not from other nodes (here node \textbf{C}) communicating with the same AP. When A and B start sending packets to the AP simultaneously, they cannot detect a collision while transmitting because they are out of range for each other. A solution to this problem is \textit{handshaking}: Assuming that B wants to send, it sends a "ready to send" (RTS) message to the AP. The AP broadcasts a "clear to send" (CTS) message. Both, B and C are hearing this message. C knows that some other station wants to send and refrains from sending. B is now sure that no other station station is transmitting simultanteously and starts sending. Thus, RTS/CTS prevents collision with packets from a hidden station.
+    \begin{center}
+      \includegraphics[width=\textwidth]{hiddenstation.png}
+    \end{center}
+    \item The \textit{Exposed Station Problem} occurs when two "pairs" of stations want to communicate to each other. Here, S1 wants to send to R1 and S2 wants to send to R2 simultaneously. R1 and R2 are out of range but S1 and S2 are in range of each other. When the transmission of S1 to R1 is active, S2 is prevented from sending because it could interfere with the signal of S1. However, R2 could receive packets from S2 without collision because it is out of range of S1.
+    \begin{center}
+      \includegraphics[width=\textwidth]{exposedstation.png}
+    \end{center}
 \end{enumerate}
 \Aufgabe{Broadband Internet Access}{3+3+3+3+3+3+3+3+3+3}
 \begin{enumerate}