<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\chapter{Background and Problem definition}

\section{Wie klassifiziert man Netzwerktraffic?}
Basic network characteristics:
- Bandwidth
- Bandwidth Jitter
- Latency
- Latency Jitter
- Packet loss

The distributions of these network characteristics can also have a direct impact
on the application. E.g. for video streaming applications the delay or loss
of a packet belonging to an I-frame \mygloss{I-Frame}{An I-Frame contains a complete picture of a
video} can have a large impact on the perceived video qualtiy by the user.
This is because the frame in question cannot be rendered to the user and
following p- and b-frames by have used this I-frame as reference so they
are also in trouble\TODO{REFRENCE, Verlust von I-Frames in streaming
video,
% ggf.http://166.111.248.20/seminar/2006_4_13/Evaluation%20of%20packet%20loss%20impairment%20on%20streaming%20video.pdf}. 
% -&gt; Matthias fragen, der macht ja sowas.
}
Also, the loss of a TCP segment (ACK?) can have different influence
on the throughput of an application.


* Show the difference between wireless networks and wired networks

\begin{tabular}{|l||l|l|}
\hline
Network         &amp;  Wired  &amp; Wireless\\
characteristic  &amp; network &amp; network \\ \hline \hline
Bandwidth       &amp; High    &amp; Medium--Low \\ \hline
Bwdth jitter    &amp; Low     &amp; High        \\ \hline
Latency         &amp; Low     &amp; Low         \\ \hline
Latency jitter  &amp; Low (1/5) &amp; Low (1/2--1) \\ \hline
Packet loss     &amp; Low     &amp; Low--High   \\ \hline
\end{tabular}
% Definition of Jitter: Abrupt and unwanted variations of one or more signal characteristic


\section{Problems of interactive, real-time applications}

\section{Problems of wireless networks}

\section{Problems of mobile ad-hoc networks}
- Wegfindung in mobilen Ad-hoc Netzen
  * Es gibt einen Routing Overhead
  * Übersicht über die Protokolle, Klassifizierung
  * AODV ist ein gutes Protokoll, Warum?, Related work!

\section{Related work - QoS}
* Give a short introduction to QoS in wired networks
* QoS in wireless networks (if any)
* QoS in MANETs (if any)
Tabelle mit Vergleich (CEDAR, etc.)

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