Untersuchungen zu Traffic Engineering im UMTS Core-Network
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Inhaltsangabe: Zusammenfassung: Neben einer generellen Darstellung der Mobilfunksysteme GSM, GPRS und UMTS, beschäftigt sich diese Diplomarbeit in erster Linie mit der Dimensionierung einzelner Links im UMTS Core-Netzwerk. Als Einführung in die vorliegende Untersuchung dient die Darstellung der mathematischen Grundlagen, wie Pareto-Verteilung und Markov'sche Ketten, das Kapitel Simulationsgrundlagen, in dem eine kurze Übersicht über die einzelnen Warteschlangensysteme und deren Abarbeitungsstrategien gegeben wird, sowie die Erklärung der Erlang-Formeln anhand von Beispielen. Das verwendete Simulationstool, der NS-Simulator der UNIVERSITÄT VON BERKELY/Kalifornien, wird ebenso kurz erläutert, wie die Skriptsprache des Simulators, Tcl/Tk (Tool Command Language/Tool Kit). Den wesentlichen Teil dieser Arbeit bildet die analytische Dimensionierung von paketorientierten Verbindungen im UMTS Core-Netzwerk mittels der Erlang C-Formel. Anschlie end erfolgte die Verifizierung durch Simulationen inklusive der graphischen Darstellung der Ergebnisse. Inhaltsverzeichnis: Inhaltsverzeichnis: Informationeni Schlagwörteri Eidesstattliche Erklärungii Danksagungiii Kurzfassungiv Abstractv Inhaltsverzeichnisvi Abbildungsverzeichnisix Tabellenverzeichnisxi 1.Einleitung1 2.Mobilfunknetze3 2.1GSM (Global System for Mobile Communications)3 2.1.1Architektur von GSM5 2.1.1.1Funkteilsystem RSS (Radio Subsystem)6 2.1.1.2Vermittlungsteilsystem NSS (Network and Switching Subsystem)7 2.1.1.3Betreiberteilsystem OSS (Operating Subsystem)9 2.1.2Verwendete Protokolle im GSM-Netz11 2.1.2.1Funktionsbeschreibung der einzelnen Protokolle11 2.1.2.2Physikalische Transportkanäle13 2.2GPRS (General Packet Radio Service)14 2.2.1Architektur von GPRS17 2.2.1.1Beschreibung der einzelnen Schnittstellen18 2.2.1.2Beschreibung der einzelnen Netzwerk-Entitäten20 2.2.2Verwendete Protokolle im GPRS-Netz27 2.2.2.1Übersicht28 2.2.2.2Erklärung der Protokolle im GPRS-Netz30 2.3UMTS (Universa
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