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diff --git a/vorlagen/thesis/src/kapitel_x.tex b/vorlagen/thesis/src/kapitel_x.tex
index a949641..ba5fcdd 100644
--- a/vorlagen/thesis/src/kapitel_x.tex
+++ b/vorlagen/thesis/src/kapitel_x.tex
@@ -1447,9 +1447,8 @@ data oriented and the networks become packet networks this type of modulating da
TDMA applied on the FDMA technique constrains the GSM air interface to be of
2D structure. The idea of employing TDMA on FDMA in the GSM900 band can be seen in figure \ref{img:GSMFreqTime}.
Each time slot duration is $\approx$577 $\mu s$, all 8 time slots have a period of $\approx$ 4.615 $ms$
-\citep{dennis} \citep{0890064717}. Using thic technique each GSM user can send data inside of the assigned time slot
-without disturbing users on different time slots. Eight time slots in GSM are called a TDMA frame.
-
+\citep{dennis} \citep{0890064717}. By applying this technique each GSM user can send data inside of the assigned time slot
+without disturbing users on different time slots.
\begin{figure}[ht!]
\centering
\includegraphics[scale=0.50]{img/GSMFreqTime.pdf}
@@ -1457,6 +1456,20 @@ without disturbing users on different time slots. Eight time slots in GSM are ca
\label{img:GSMFreqTime}
\end{figure}
+Eight time slots in GSM are called a TDMA frame. Each time slot
+in GSM is known as a burst. Every TDMA frame is assigned a unique integer number which is then repeated and reassigned
+every 3h:28m:53s:760ms, also known as \textit{hyperframe} \citep[Chapter 7]{0890064717}. In the hierarchy pyramid,
+a layer lower of the hyperframe is the \textit{superframe}. There are two types of superframes, consisting of two types
+of \textit{multiframes}, differing in their length \citep[Chapter 7]{0890064717}. The relations can be seen in figure
+\ref{img:GSMHierarchy} with their duration periods.
+
+\begin{figure}[ht!]
+ \centering
+ \includegraphics[scale=0.70]{img/GSMHierarchy.pdf}
+ \caption{Hierarchy of the frames in GSM.}
+\label{img:GSMHierarchy}
+\end{figure}
+
\begin{figure}[ht!]
\centering
\includegraphics[scale=0.50]{img/GSMBig.pdf}