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-rw-r--r--Tex/Content/Abstract.tex1
-rw-r--r--Tex/Content/Abstract.tex~1
-rw-r--r--Tex/Content/Appendix.tex0
-rw-r--r--Tex/Content/Bibliography.bib141
-rw-r--r--Tex/Content/GSM.log2381
-rw-r--r--Tex/Content/GSM.tex335
-rw-r--r--Tex/Content/Motivation.tex16
7 files changed, 2875 insertions, 0 deletions
diff --git a/Tex/Content/Abstract.tex b/Tex/Content/Abstract.tex
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+asjdajslkdajdalsdj
diff --git a/Tex/Content/Abstract.tex~ b/Tex/Content/Abstract.tex~
new file mode 100644
index 0000000..0ad1899
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+++ b/Tex/Content/Abstract.tex~
@@ -0,0 +1 @@
+asjdajslkdajdalsdj\gls{AD} \ No newline at end of file
diff --git a/Tex/Content/Appendix.tex b/Tex/Content/Appendix.tex
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--- /dev/null
+++ b/Tex/Content/Appendix.tex
diff --git a/Tex/Content/Bibliography.bib b/Tex/Content/Bibliography.bib
new file mode 100644
index 0000000..950ea27
--- /dev/null
+++ b/Tex/Content/Bibliography.bib
@@ -0,0 +1,141 @@
+@Book{GSM2009,
+author = {J\"{o}rg Ebersp\"{a}cher and Hans-J\"{o}rg V\"{o}gel and Christian Bettstetter and Christian Hartmann},
+editor = {John Wiley \& Sons},
+title = {GSM -- Architecture, Protocols and Services},
+publisher = {Wiley},
+year = {2009}
+}
+
+@Book{protocols1999,
+title={GSM networks: protocols, terminology, and implementation},
+author={Heine, G.},
+year={1999},
+publisher={Artech House}
+}
+
+@Book{kommsys2006,
+title={Grundkurs mobile Kommunikationssysteme : von UMTS, GSM und GRPS zu Wireless LAN und Bluetooth Piconetzen},
+author={Martin Sauter},
+year={2006},
+publisher={Vieweg}
+}
+
+@article{overview1994,
+title={Overview of GSM: philosophy and results},
+author={Haug, T.},
+journal={International Journal of Wireless Information Networks},
+volume={1},
+number={1},
+pages={7--16},
+year={1994},
+publisher={Springer}
+}
+
+@article{overview1996,
+title={Overview of GSM: The global system for mobile communications},
+author={Scourias, J.},
+journal={University of Waterloo},
+year={1996}
+}
+
+@Misc{GSM_history2011,
+title = {Brief History of GSM and the GSMA},
+year = {2011},
+note = {[Accessed: 28/11/2011]},
+key = {gsm.org},
+howpublished = {\url{http://www.gsm.org/about-us/history.htm}}
+}
+
+@Misc{GSM_stats2011,
+title = {GSM/3g Stats},
+year = {2011},
+note = {[Accessed: 28/11/2011]},
+key = {gsacom.com},
+howpublished = {\url{http://www.gsacom.com/news/statistics.php4}}
+}
+
+@Misc{hsdpa,
+title = {{UE} Radio Access capabilities},
+series = {Technical Specification},
+number = {25.306},
+year = {2011},
+key = {hsdpa},
+howpublished = {3GPP TS 25.306, \url{http://www.3gpp.org/ftp/Specs/html-info/25306.htm}}
+}
+
+@Misc{hsupa,
+title = {Medium Access Control (MAC) protocol specification},
+year = {2011},
+key = {hsupa},
+howpublished = {3GPP TS 25.321, \url{http://www.3gpp.org/ftp/Specs/html-info/25321.htm}}
+}
+
+@article{3gpp_Proposal2000,
+title={The 3GPP proposal for IMT-2000},
+author={Chaudhury, P. and Mohr, W. and Onoe, S.},
+journal={Communications Magazine, IEEE},
+volume={37},
+number={12},
+pages={72--81},
+year={1999},
+publisher={IEEE}
+}
+
+@article{ITU1200,
+title={Intelligent Network},
+author={{Telecomunication standardization sector of ITU}},
+journal={SERIES Q: Switching and Signaling},
+volume={Q1200},
+number={7},
+year={1997},
+publisher={ITU}
+}
+
+@Misc{GSM0207,
+title = {Digital cellular telecommunications system (Phase 2+): Mobile Stations (MS) features},
+series = {Technical Specification},
+number = {02.07},
+year = {2000},
+howpublished = {GSM 02.07, \url{http://www.3gpp.org/ftp/Specs/archive/02_series/02.07/0207-710.zip}}
+}
+
+@Misc{GSM0505,
+title = {Radio Access Network: Radio transmission and reception},
+series = {Technical Specification},
+number = {05.05},
+year = {1999},
+howpublished = {GSM 05.05, \url{http://www.3gpp.org/ftp/Specs/archive/05_series/05.05/0505-8k0.zip}}
+}
+
+@Misc{GSM23003,
+title = {Numbering, addressing and identification},
+series = {Technical Specification},
+number = {23.003},
+year = {2011},
+howpublished = {GSM 23.003, \url{http://www.3gpp.org/ftp/Specs/archive/23_series/23.003/23003-a30.zip}}
+}
+
+@Misc{ISO7810,
+title = {Identification cards -- Physical characteristics},
+series = {ISO},
+number = {7810:2003},
+year = {2003},
+howpublished = {ISO/IEC 7810:2003, \url{http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=31432}}
+}
+
+@Misc{ITU212,
+title={List of Mobile Country or Geographical Area Codes},
+author={{Telecomunication standardization sector of ITU}},
+journal={Annex to ITU Operational Bulletin},
+volume={953},
+year={2010},
+publisher={ITU}
+}
+
+@Misc{GSM23078,
+title = {Customised Applications for Mobile network Enhanced Logic},
+series = {Technical Specification},
+number = {23.078},
+year = {2011},
+howpublished = {GSM 23.078, \url{http://www.3gpp.org/ftp/Specs/archive/23_series/23.078/23078-b00.zip}}
+} \ No newline at end of file
diff --git a/Tex/Content/GSM.log b/Tex/Content/GSM.log
new file mode 100644
index 0000000..bcfc752
--- /dev/null
+++ b/Tex/Content/GSM.log
@@ -0,0 +1,2381 @@
+This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) (format=pdflatex 2011.10.17) 28 NOV 2011 14:48
+entering extended mode
+ %&-line parsing enabled.
+**GSM.tex
+(./GSM.tex
+LaTeX2e <2009/09/24>
+Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, noh
+yphenation, farsi, arabic, croatian, bulgarian, ukrainian, russian, czech, slov
+ak, danish, dutch, finnish, french, basque, ngerman, german, german-x-2009-06-1
+9, ngerman-x-2009-06-19, ibycus, monogreek, greek, ancientgreek, hungarian, san
+skrit, italian, latin, latvian, lithuanian, mongolian2a, mongolian, bokmal, nyn
+orsk, romanian, irish, coptic, serbian, turkish, welsh, esperanto, uppersorbian
+, estonian, indonesian, interlingua, icelandic, kurmanji, slovenian, polish, po
+rtuguese, spanish, galician, catalan, swedish, ukenglish, pinyin, loaded.
+! Undefined control sequence.
+l.1 \chapter
+ {GSM}
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+
+! LaTeX Error: Missing \begin{document}.
+
+See the LaTeX manual or LaTeX Companion for explanation.
+Type H <return> for immediate help.
+ ...
+
+l.1 \chapter{G
+ SM}
+You're in trouble here. Try typing <return> to proceed.
+If that doesn't work, type X <return> to quit.
+
+Missing character: There is no G in font nullfont!
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+! Undefined control sequence.
+l.2 ... overview of some important aspects of \gls
+ {gsm}.
+The control sequence at the end of the top line
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+! Undefined control sequence.
+l.3 ...historical summary on the evolution of \gls
+ {gsm} and how it came to b...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
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+and I'll forget about whatever was undefined.
+
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+! Undefined control sequence.
+<write> ...erence `sec:protocol' on page \thepage
+ \space undefined\on@line .
+l.4 In section \ref{sec:protocol}
+ the system architecture and its components...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
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+
+
+LaTeX Warning: Reference `sec:protocol' on page undefined on input line 4.
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+! Undefined control sequence.
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+ \space undefined\on@line .
+l.5 Section \ref{sec:catcher}
+ will describe how an IMSI-catcher works and ho...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
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+
+
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+
+! Undefined control sequence.
+l.7 \section
+ {A Historical Perspective}
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+
+! LaTeX Error: Missing \begin{document}.
+
+See the LaTeX manual or LaTeX Companion for explanation.
+Type H <return> for immediate help.
+ ...
+
+l.7 \section{A
+ Historical Perspective}
+You're in trouble here. Try typing <return> to proceed.
+If that doesn't work, type X <return> to quit.
+
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+! Undefined control sequence.
+l.9 This committee was part of the \gls
+ {cept} 1982, with the task of develop...
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+and I'll forget about whatever was undefined.
+
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+! Undefined control sequence.
+l.12 ...works were the C-Netz in Germanyn the \gls
+ {tacs} in the UK or \gls{n...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
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+! Undefined control sequence.
+l.12 ... Germanyn the \gls{tacs} in the UK or \gls
+ {nmt} in Scandinavia.
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
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+
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+[]
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+
+Overfull \hbox (35.26643pt too wide) in paragraph at lines 7--13
+\OT1/cmr/m/it/10 Sp^^Seciale
+ []
+
+
+Overfull \hbox (17.65544pt too wide) in paragraph at lines 7--13
+\OT1/cmr/m/it/10 Mo-
+ []
+
+
+Overfull \hbox (14.82211pt too wide) in paragraph at lines 7--13
+\OT1/cmr/m/it/10 bile
+ []
+
+! Undefined control sequence.
+l.14 \gls
+ {cept} itself was around since 1959 and the member founded the \gls...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+
+! LaTeX Error: Missing \begin{document}.
+
+See the LaTeX manual or LaTeX Companion for explanation.
+Type H <return> for immediate help.
+ ...
+
+l.14 \gls{c
+ ept} itself was around since 1959 and the member founded the \gls...
+
+You're in trouble here. Try typing <return> to proceed.
+If that doesn't work, type X <return> to quit.
+
+Missing character: There is no c in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 5 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+! Undefined control sequence.
+l.14 ...since 1959 and the member founded the \gls
+ {etsi} in 1988.
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+Missing character: There is no e in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 8 in font nullfont!
+Missing character: There is no 8 in font nullfont!
+Missing character: There is no . in font nullfont!
+Missing character: There is no I in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no y in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no , in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no . in font nullfont!
+Missing character: There is no T in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no y in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no , in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+! Undefined control sequence.
+l.16 ...er the committee became a part of the \gls
+ {etsi} in 1989 to \emph{Gl...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+Missing character: There is no e in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 8 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no . in font nullfont!
+Missing character: There is no I in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no v in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no y in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no y in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no r in font nullfont!
+! Undefined control sequence.
+l.17 ...very same year the specifications for \gls
+ {dcs1800} were also submit...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+Missing character: There is no d in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 8 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no . in font nullfont!
+Missing character: There is no T in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no y in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no , in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 8 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no M in font nullfont!
+Missing character: There is no H in font nullfont!
+Missing character: There is no z in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no g in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no U in font nullfont!
+Missing character: There is no S in font nullfont!
+Missing character: There is no A in font nullfont!
+Missing character: There is no ' in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no 1 in font nullfont!
+Missing character: There is no 9 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no 0 in font nullfont!
+Missing character: There is no M in font nullfont!
+Missing character: There is no H in font nullfont!
+Missing character: There is no z in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no . in font nullfont!
+Missing character: There is no U in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no u in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no l in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no h in font nullfont!
+Missing character: There is no e in font nullfont!
+! Undefined control sequence.
+l.19 Under the umbrella of the \gls
+ {etsi}, many \gls{stc}s began to work on ...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+Missing character: There is no e in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no , in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no y in font nullfont!
+! Undefined control sequence.
+l.19 ... the umbrella of the \gls{etsi}, many \gls
+ {stc}s began to work on di...
+The control sequence at the end of the top line
+of your error message was never \def'ed. If you have
+misspelled it (e.g., `\hobx'), type `I' and the correct
+spelling (e.g., `I\hbox'). Otherwise just continue,
+and I'll forget about whatever was undefined.
+
+Missing character: There is no s in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no b in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no g in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no w in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no k in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no d in font nullfont!
+Missing character: There is no i in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no r in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no n in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no a in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no p in font nullfont!
+Missing character: There is no e in font nullfont!
+Missing character: There is no c in font nullfont!
+Missing character: There is no t in font nullfont!
+Missing character: There is no s in font nullfont!
+Missing character: There is no o in font nullfont!
+Missing character: There is no f in font nullfont!
+Missing character: There is no m in font nullfont!
+Missing character: There is no o in font nullfont!
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+ {Growth of mobile GSM subscriptions. Compiled from \cite{GSM2009}}
+
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+l.31 \caption{G
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+ {The GSM Protocol}
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+\chapter{GSM}
+\label{ch:gsm}
+This chapter will give short overview of some important aspects of \gls{gsm}.
+The first section will give a brief historical summary on the evolution of \gls{gsm} and how it came to be what it is today.
+In section \ref{sec:network} the system architecture and its components as well as protocol basics will be explained that are essential to understand how an IMSI-catcher operates.
+Section \ref{sec:catcher} will describe how an IMSI-catcher works and how it differs from the system components it replaces.
+
+\section{A Historical Perspective}
+The acronym GSM was originally derived fom \emph{Group Sp\'{e}ciale Mobile}.
+This committee was part of the \gls{cept} 1982, with the task of developing a pan-Eurpean digital cellular mobile radio standard in the 900MHz range.
+1986 the frequency range was officially licensed.
+The foundation of this task group was a direct answer to the development of independent and incompatible analog radio networks during the 80's.
+Examples of such networks were the C-Netz in Germany the \gls{tacs} in the UK or \gls{nmt} in Scandinavia.
+
+In 1987 the committee submitted the basic parameters of GSM in February.
+Not far after, in September, the \gls{MoU} was signed in Copenhagen by 15 members of 13 Countries that were dedicated to deploy GSM in their respective countries.
+This agreement was the basis for allowing international operation of mobile stations, using the interfaces agreed upon earlier that year.
+\gls{cept} itself was around since 1959 and the member founded the \gls{etsi} in 1988.
+In the same year the committee submitted the first detailed specification for the new communications standard.
+The acronym was reinterpreted in 1991, after the committee became a part of the \gls{etsi} in 1989 to \emph{Global System for Mobile Communications}.
+In the very same year the specifications for \gls{dcs1800} were also submitted.
+These were essentially the same specifications, translated in the 1800MHz range and the foundation for the USA's 1900MHz band.
+Under the umbrella of the \gls{etsi}, many \gls{stc}s began to work on different aspects of mobile communication, like network aspects (SMG 03) or security aspects (SMG 10).
+SMG 05 dealt with future networks and especially with UMTS specifications, which eventually became an independent body inside the \gls{etsi}.
+
+In 1992 many European countries had operational mobile telephone networks.
+These networks were a huge success, and as soon as 1993 they already counted more than one million subscribers \cite{GSM2009}.
+Also many networks on different frequency bands (900MHz, 1800MHz, 1900MHz) were started outside Europe in countries like the US or Australia, with Telstra as the first non European provider.
+The rapid growth of mobile subscribers worldwide until today can be seen in figure \ref{fig:gsm_growth}.
+Three of the main reasons for this rapid growth are explained by Heine \cite{protocols1999} as:
+\begin{itemize}
+ \item Liberalization of the mobile market in Europe, which allowed for competition and thus resulting in lower prices and enhanced development.
+ \item Expertise within the Groupe Sp\'{e}ciale Mobile and their collaboration with industry.
+ \item The lack of competitive technologies.
+\end{itemize}
+
+\begin{figure}
+\centering
+\begin{tikzpicture}
+\begin{axis}[
+ width=\textwidth,
+ height=0.3\textheight,
+ xlabel=Year,
+ ylabel=Subscribers,
+ xticklabel style={/pgf/number format/1000 sep=}
+ ]
+ \addplot [smooth,mark=*,blue] plot coordinates {
+ (1994, 1e6)
+ (1995, 10e6)
+ (1996, 50e6)
+ (1998, 100e6)
+ (2001, 500e6)
+ (2005, 1.5e9)
+ (2007, 2.5e9)
+ (2008, 3e9)
+ (2009, 3.5e9)
+ (2010, 3.7e9)
+ (2011, 4e9)
+ };
+\end{axis}
+\end{tikzpicture}
+\caption{Growth of mobile GSM subscriptions. Compiled from \cite{GSM2009,GSM_history2011,GSM_stats2011}}
+\label{fig:gsm_growth}
+\end{figure}
+
+\begin{figure}
+\centering
+\includegraphics[width=.5\textwidth]{../Images/3gpp.jpg}
+\caption{The 3GPP Logo}
+\end{figure}
+
+In 1998 the \gls{3gpp} was founded by 5 organizational partners with the goal of standardization in mobile communications, with focus on developing specifications for a third generation mobile radio system.
+These partners were \gls{arib}, \gls{etsi}, \gls{atis}, \gls{tta} and \gls{ttc}.
+This focus was later expanded in the light of the \emph{International Mobile Communications-2000}-project \cite{3gpp_Proposal2000} of the \gls{itu} to
+\begin{itemize}
+ \item Devolpment and maintainance of \gls{gsm} and \gls{gprs}, including \gls{edge}, which are standards for high speed packet oriented data transmission via \gls{gsm}.
+ \item Development of a third generation mobile communication system on the basis of the old \gls{gsm} protocol. This standard is called \gls{umts}
+ \item An IP based multimedia system.
+\end{itemize}
+Up to now, the \gls{3gpp} has enhanced mobile standards.
+In 2005 the first \gls{hsdpa} network went online.
+\gls{hsdpa} \cite{hsdpa} is a protocol that enables mobile users to download data with speeds up to 84Mbit/s since release 9.
+\gls{hsupa} \cite{hsupa} is a related protocol in the \gls{hspa} family that provides similar high speed functionality for uploading data.
+These and other specification are published on the \gls{3gpp} website\footnote{\url{http://www.3gpp.org/}}.
+
+\section{The GSM Network}
+\label{sec:network}
+
+The \gls{gsm} network is a distributed, star shaped network type that is built on top of existing telephony infrastructure to additionally connect mobile users.
+The telephony network is not only used to connect mobile subscribers to landline phones, but also to connect the different components of the mobile network.
+The main components of a \gls{gsm} network can be seen in figure \ref{fig:gsm_network} as well as the interfaces that are used to connect them.
+\begin{figure}
+\caption{The main components of a GSM network.}
+\label{fig:gsm_network}
+\end{figure}
+There are different notions of how to distribute these components into functional entities.
+In the following the classification of \cite{kommsys2006} will be used.
+It describes the main parts as:
+\begin{itemize}
+ \item \gls{bss}: this part is also called radio network and thus contains all the technology necessary for connecting mobile subscribers to the telephony network and routing their calls.
+ These calls originate from the \gls{ms} that will be explained in section \ref{sec:ms}, and travel over the air interface to the receiver stations for further processing.
+ The air interface or $U_m$ interface will be explained in section \ref{sec:Um}, whereas the rest of the subsystem will be argued in section \ref{sec:bss}.
+ \item \gls{nss}: the core network, as it is sometimes called, consists of several entities that are used to establish and route a connection.
+ This is not only limited to calls within the provider's network but also into other provider's networks or the \gls{pstn}.
+ The databases that contain subscriber information and location information for connected users are also located here, thus this is the place where mobility management is handled.
+ \item \gls{in}: this part of the network augments the core network with \gls{vas} \cite{ITU1200}.
+ In order to provide extra functionality the \gls{in} consists of several \gls{scp} databases.
+ Some of the most used services are in fact services of the \gls{in} and not core services.
+ Examples are prepaid cards, home areas\footnote{This service defines a geographical area, in which lower rates are calculated for mobile calls.} or telephone number portability.
+\end{itemize}
+Other sources define the \gls{oms} \cite{GSM2009} or limit the \gls{bss} entity to the provider part and define an additional entity for the \gls{ms} \cite{overview1994, overview1996}.
+The three subsystems as well as the \gls{ms} will now be discussed in greater detail.
+
+\subsection{Mobile Station}
+\label{sec:ms}
+With the advent of portable microprocessors in the 80's mobile phones became possible.
+Advance in technology up to today yielded smaller mobile phones with more functionality year by year to a point where not the technology itself was the limiting factor for size, but the user interface, \eg button and display sizes.
+Figure \ref{fig:phones} shows the evolution of the mobile phone over the last decades.
+\begin{figure}
+\caption{Evolution of mobile phones over the last decades.}
+\label{fig:phones}
+\end{figure}
+What hasn't changed is the basic distinction between \gls{me} and \gls{sim}, the parts of which a \gls{ms} consists.
+
+It is hard to get a tight grip on what \gls{me} is.
+GSM Recommendation 02.07 \cite{GSM0207} summarizes the mandatory and optional features of a \gls{ms}.
+Some of the most important mandatory features are \cite{protocols1999}:
+\begin{itemize}
+ \item \gls{dtmf} signaling capability.
+ \item \gls{sms} capability.
+ \item The cyphering algorithms A5/1 and A5/2 need to be implemented.
+ These are discussed in detail in section \ref{sec:nss}.
+ \item Display capability for short messages and dialed numbers, as well as available \gls{plmn}s.
+ \item Capable of doing emergency calls without \gls{sim} card.
+ \item Machine fixed \gls{imei}.
+ In a strict sense, this disqualifies many modern mobile phones, since the \gls{imei} is not burned into the device itself but is rather part of the software or firmware respectively.
+ Tools like \emph{ZiPhone}\footnote{\url{http://www.ziphone.org/}} for iOS devices\footnote{\url{http://www.apple.com/ios/}}, especially iPhone\footnote{\url{http://www.apple.com/iphone/}}, can change this supposedly unchangable identifier.
+\end{itemize}
+
+The range of devices complying to these specifications is rather large, so categorizing can be challenging.
+The intuitive approach would be to establish buckets by device type, but there are so many different devices as well as hybrid devices out there that this approach would not only be impracticable, but also too ambiguous.
+Does a smartphone belong into the same category as a \gls{pda} or in the category of mobile phones.
+
+Another way to categorize different \gls{me}s is by supported frequency band and power class rating according to GSM 05.05\cite{GSM0505}.
+Most mobile phones and smartphones belong to power class 4 and 5, which are for handheld devices.
+Class 4 devices have and output of 2/33 W/dBm and class 5 0.8/29 W/dBm.
+Classes with higher output are typically installed devices, \eg in cars.
+These classes differ for the different frequency bands, since output needed in higher frequency bands (1800/1900 MHz) is less compared to the 900MHz band.
+The supported band is also common category, since it describes in which countries a mobile phone can be used.
+However it is more common nowadays that \gls{me} supports two bands or even all three bands.
+These are called dual-band and tri-band devices respectively.
+
+%SIM format and data
+As the name suggests, the \gls{sim} card is essentially a data storage that holds user specific data.
+This separation is interesting for the GSM user since it allows him/her to exchange the \gls{me} without having to contact the provider.
+Thus it can be used on different frequency bands and is one of the preconditions for roaming.
+The \gls{sim} card can either be in plug-in format or ID-1 SIM format which is normally used for telephone cards, credit cards or car installed \gls{me}.
+The plug-in format is also called ID-000 and can be found in ISO/IEC 7810\cite{ISO7810}.
+
+The most important information stored on a \gls{sim} card are the \gls{imsi} and the \gls{ki}.
+A subset of other parameters stored on the \gls{eeprom}of the card can be seen in Table \ref{tab:simdata}.
+
+\begin{table}
+\centering
+\begin{tabular}{@{}ll@{}}
+\toprule
+Parameter &Description\\
+\midrule
+\multicolumn{2}{l}{Security Related}\\
+\midrule
+A3/A8 &Algorithms required for authentication and generation the session key\\
+Ki &Secret key\\
+Kc &Session key, generated from a random number and Ki vie A8\\
+PIN &Secret numeric password to use a SIM card\\
+PUK &Secret numeric password to unlock the SIM card\\
+\midrule
+\multicolumn{2}{l}{Subscriber Data}\\
+\midrule
+IMSI &Subscriber identification\\
+MSISDN &Telephone number\\
+\midrule
+\multicolumn{2}{l}{Network Related}\\
+\midrule
+LAI &Identifier of the current location area\\
+TMSI &Temporary IMSI\\
+Home PLMN &Multiple entries to identify the home PLMN\\
+\bottomrule
+\end{tabular}
+\caption{Subset of data stored on a SIM card. Adopted from \cite{protocols1999}}
+\label{tab:simdata}
+\end{table}
+
+This key is used to generate the \gls{kc}, as will be explained in Section \ref{sec:nss}.
+Most of this data, although not the security relevant \gls{ki} can be read via a USB \gls{sim} card reader, which can be bought for around \$10 on the web.
+Since \gls{ki} never leaves the card, \gls{kc} has to be dynamically generated on the card.
+This can be done since the card itself has a microprocessor that manages the security relevant data.
+Key functions, like running the GSM key algorithm, verifying a \gls{pin} or reading a file can be accessed through the microprocessor via a communication protocol.
+A brief description of the protocol and functionalities can be found in \cite{kommsys2006}.
+
+The \gls{imsi} as described in GSM 23.003\cite{GSM23003} uniquely identifies a subscriber.
+It has at most 15 digits and is divided into three parts, \gls{mcc},\gls{mnc} and \gls{msin}, of which only the last part is the personal identification number of the subscriber.
+The first two are also called \gls{hni}.
+The three digit \gls{mcc} describes the country code, the area of domicile of the mobile subscriber.
+The \gls{mnc} is an identification number for the home \gls{plmn}.
+This can either have two or three digits depending on the \gls{mcc}.
+It is not recommended by the specification and thus not defined to mix two and three digit \gls{mnc}s for a single \gls{mcc}.
+These country codes are assigned by the \gls{itu} in ITU E.212\cite{ITU212}.
+An excerpt can be found in Table \ref{tab:countrycodes}.
+The third part, the \gls{msin} is a number consisting of up to ten digits, which is used for authentication of the mobile subscriber against his provider.
+\gls{mnc} and \gls{msin} together are called \gls{nmsi}.
+\begin{table}
+\centering
+\subtable{
+\begin{tabular}{ll}
+\toprule
+Country &MCC\\
+\midrule
+Germany &262\\
+France &208\\
+USA &310 - 316\\
+UK &234 - 235\\
+Switzerland &228\\
+Austria &232\\
+Poland &260\\
+\bottomrule
+\end{tabular}
+}
+\hspace{1cm}
+\subtable{
+\begin{tabular}{lll}
+\toprule
+Provider &Country &MNC\\
+\midrule
+T-Mobile &Germany &01, 06(R)\\
+Vodafone &Germany &02, 04(R), 09(R)\\
+E-Plus &Germany &03, 05(R), 77(T)\\
+$O_2$ &Germany &07, 08(R), 11(R)\\
+Orange &France &00, 01, 02\\
+Swisscom &Switzerland &01\\
+A1 &Austria &01, 09\\
+\bottomrule
+\end{tabular}
+}
+\caption{Mobile Country and Network Codes. (R) denotes that the MCC is reserved but not operational as of yet, whereas (T) denotes a operational test network.}
+\label{tab:countrycodes}
+\end{table}
+
+\subsection{Basestation Subsystem}
+\label{sec:bss}
+%TODO: maybe more references to gsm-ts?
+\subsection{Network Subsystem}
+\label{sec:nss}
+The most important task of the \gls{nss} is to establish connections and route calls between different locations.
+This is done by so called \gls{msc}, that can route a call either to another \gls{msc}, into the \gls{pstn} or another provider's network.
+Apart from routing, the \gls{nss} also provides the means to administer subscribers inside the network.
+Facilities to support this task are the \gls{hlr}, the \gls{vlr}, the \gls{eir} as well as the \gls{ac} that will now be described in further detail.
+The \gls{smsc} is also part of this subsystem handling text messages.
+A possible arrangement of these components is displayed in Figure \ref{fig:gsm_network}.
+
+\subsubsection{Mobile Switching Center}
+\subsubsection{Home Location Register}
+The \gls{hlr} is the central database in which all personal subscriber related data is stored.
+The entries can be divided into two classes, permanent administrative and temporary data.
+Part of this administrative data is which services a subscriber has access to and which are prohibited (\eg roaming in certain networks).
+The data itself is indexed with the customer's \gls{imsi}, to which multiple telephone numbers can be registered.
+Since these \gls{msisdn} are independent from the \gls{imsi} a subscriber can change his telephone number and thus also move the telephone number along should he/she decide to switch to a new provider.
+Basic services that access is stored for in the \gls{hlr} are amongst others the ability to receive and send telephone calls, use data services or send text messages.
+Additional services, called Supplementary Services like call forwarding or display of phone numbers during calls can also be set or unset in this database.
+It is up to the provider if these services are available freely or bound to a fee.
+The temporary data enfolds the current \gls{vlr} and \gls{msc} address as well as the \gls{msrn} which is essentially a temporary location dependent ISDN number.
+
+
+\subsubsection{Visitor Location Register}
+\subsubsection{Equipment Identification Register}
+\subsubsection{Authentication Center}
+
+\subsection{Intelligent Network}
+The two subsystems above are necessary for the correct operation of a \gls{gsm} network.
+While the \gls{in} is not essential for operation, all providers offer additional services that need additional logic and databases.
+These databases are called \gls{scp} databases and are one of three possible \gls{ss7} nodes.
+They can influence the build-up of a connection or modify parameters for that specific connection.
+
+Two of the most common services offered are \gls{lbs} and prepaid services.
+An Example for a well known \gls{lbs} that is provided by the \gls{in} is a dynamic calling rate service.
+If the mobile subscriber is in a specific geographical area, the \gls{scp} can modify the Billing Record to lower the calling rates.
+This is known as home-zone.
+If a mobile subscriber uses a prepaid service, an account is created for this subscriber that can be topped up.
+Afterwards calls and text messaged use up the money on that account.
+This is an alternative to a monthly bill and attracted many customers since its advent in the mid 90's.
+For this service the \gls{scp} needs to constantly update the money on the account during calls and when text messages are sent.
+
+Since these services were defined as additional and thus no specification existed, they evolved into vendor specific proprietary networks, that were not interoperable.
+To standardize these services, \gls{3gpp} and \gls{etsi} defined the \gls{camel} protocol in TS 23.078\cite{GSM23078}.
+\gls{camel} specifies a protocol much like \gls{http} that regulates how the different components of a \gls{gsm} network exchange information.
+As such it is not an application itself but rather a framework to build vendor independent, portable services.
+\subsection{The Cellular Principle}
+\section{The $U_m$ Interface}
+\label{sec:Um}
+\subsection{Layers}
+\subsection{The Radio Channel}
+\subsection{Logical Channels}
+\section{IMSI-Catcher}
+\label{sec:catcher}
+\subsection{Mode of Operation}
+\subsection{Possible Attacks}
+\subsection{Law situation in Germany}
+%germany not plagued by terrorism
+%response to 9/11: overreaction (Luftschutzgesetz)
+%no definition for terror in german law
+%preventive meassures taken
+%government can influence prosecution
+
+%---- procedural law ------
+%terrorists/criminals switch mobile phone/sim cards often
+%imsi-catcher: identification to apply telephone surveillance, whereabouts for arrest warrant, no other purpose allowed
+%prior authorization by a judge (legislative power) or prosecutor (executive power) in case of emergency ----> revoked
+%2004: no electronic surveillance in private premises HOWEVER for data needed for criminal cundoct allowed
+%sacrifice of personal rights for crime surveillance
+%threshold for elecronic surveillance is VERY low when the word terrorism or serious crimes bumps up
+%police needs to show certain evidence underpinning a suspicion that such a criminal act was committed, attempted or prepared
+%evidence from agents that is not transparent
+
+%"Electronic surveillance, it seems, is no
+%longer governed by questions of legitimacy, but solely by the question of practi-
+%cality. Every method that is practical, will be used by police and agencies.37
+%Often enough the courts have given up any serious control of investigation
+%methods"
+%See U. Eisenberg and T. Singelnstein, ‘Zur Unzulassigkeit der heimlichen Ortung per ‘‘stiller
+%SMS’’’, 25 Neue Zeitschrift fur Strafrecht (2005) 62, at 67.
+
+%easier share of sensitive information between police/intelligence/prosecution
+%similar examples for other areas like surrender of citizens
+
+
+
diff --git a/Tex/Content/Motivation.tex b/Tex/Content/Motivation.tex
new file mode 100644
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+++ b/Tex/Content/Motivation.tex
@@ -0,0 +1,16 @@
+\chapter{Introduciton}
+Boundless communication for everyone, everywhere, anytime.
+That was the main idea and dream behind the development of the \gls{gsm} technology.
+Considering its reception and growth \cite{GSM2009,GSM_history2011,GSM_stats2011} it can be said that \gls{gsm} was one of the most successful technologies of the last 30 years.
+Since the advent of portable radio equipment and portable microprocessors, mobile phones became technologically possible in the 80's.
+From this point on,
+
+\section{Structure}
+The remainder of this thesis is structured as follows:
+Chapter \ref{ch:gsm} will give an overview of how the \gls{gsm} network is structured as well as describe the different components needed for operation and how they work together.
+The second part of this chapter will discuss how the $U_m$ interface, or air interface works and what kind of information can be drawn off this interface.
+The last part shows how an IMSI-Catcher works and where is it situated in the network shown before.
+Possible attacks of how an IMSI-Catcher can be introduced in such a network are listed as well.
+Finally there will be a discussion about the judicial situation in Germany concerning means of electronic surveillance for crime prevention and how this affects privacy and the basic rights of citizens.
+
+The next chapter outlines the frameworks and the hardware that was used for this project.