From 8d47d5b10b18285c7f8915a5af3befce34b08d18 Mon Sep 17 00:00:00 2001
From: Refik Hadzialic
Date: Tue, 3 Apr 2012 21:47:38 +0200
Subject: harware

---
 vorlagen/thesis/src/kapitel_x.tex | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

(limited to 'vorlagen/thesis/src/kapitel_x.tex')

diff --git a/vorlagen/thesis/src/kapitel_x.tex b/vorlagen/thesis/src/kapitel_x.tex
index 0a166b0..d2f01b6 100644
--- a/vorlagen/thesis/src/kapitel_x.tex
+++ b/vorlagen/thesis/src/kapitel_x.tex
@@ -30,23 +30,38 @@ functional GSM network with GPS localization capabilities. Firstly the nanoBTS
 will be introduced since it is the main hardware component used for building a
 basic GSM network infrastructure. Then a short insight into the used
 GPS receiver will be given. Additionally the mobile stations used for
-testing of the system will be reviewed. Finally a hardware connection diagram
+testing of the system will be reviewed. Finally, a hardware connection diagram
 will be given.
  
 \section{GSM hardware - nanoBTS}
 In recent years, there has been an increasing interest in deployment of
 private cellular networks for research or in remote areas which lead to
 the devolopment of diverse ``low-cost'' GSM hardware solutions. According to 
-ip.access, the manufacturer of nanoBTS \citep{nanoGSM2007brochure}, it is the
-most deployed BTS hardware used for coverage of ``hard-to-reach places,
-in-buildings, remote areas, marine and aviation; public spaces''.
+ip.access\footnote{http://www.ipaccess.com}, the manufacturer of nanoBTS, it is the
+most deployed BTS hardware used for coverage of ``hard-to-reach places;
+in-buildings; remote areas; marine and aviation; and public spaces''.
 A nanoBTS with its plastic cover can be seen in Figure \ref{img:nanoBTS}. 
 Our University GSM network consists of three nanoBTS stations. The deployed
 nanoBTS in author's thesis works in the 1800 MHz frequency range,
 for which the University of Freiburg had obtained a licence from the
-Federal Network Agency. The key limitation of gathering more technical data was
-the fact that nanoBTS is not an open source hardware however, the given
-technical data were sufficient for conducting the RRLP work.
+Federal Network Agency (German: $Bundesnetzagentur$). The transmission frequencies
+range between 1805-1880 MHz, with 200 KHz channel spacing and maximal output power
+of +13 dBm ($\approx$20 mW), whereas the receiving frequencies
+lie in the range between 1710-1785 MHz and same channel spacing of 200
+KHz \citep{nanoGSM2007brochure}. 
+The key limitation of gathering more technical data lies in
+the fact that nanoBTS is not an open source hardware product however, the given
+technical data are sufficient for reproducing and conducting the RRLP tests. 
+
+Author's test system operated on the ARFCN 877 channel. ARFCN (Absolute Radio
+Frequency Channel Number) defines the uplink and downlink channel frequency insdide 
+the GSM network \citep{Richard2011Master}. ARFCN 877 corresponds to the uplink frequency
+of 1,783.2 MHz and a downlink frequency of 1,878.2 MHz, where the uplink direction
+represents the direction from the nanoBTS to the mobile stations and downlink vice versa.
+
+The decision to use the ARFCN 877 
+channel was derived from the fact that the channel was free, measurements were
+carried out with a spectrum analyzer built on the USRP hardware. 
 
 \begin{figure}[ht!]
 \label{img:nanoBTS}
@@ -59,6 +74,7 @@ technical data were sufficient for conducting the RRLP work.
 
 \chapter*{Dictionary of acronyms}
 \begin{itemize}
+\item \emph{ARFCN} - Absolute Radio Frequency Channel Number - The channel number specifies the physical frequency channel used for transmission and reception inside of an BTS covered area.
 \item \emph{BTS} - Base Transceiver Station - 
 \item \emph{RRLP} - Radio Resource Location Protocol - The employed protocol in GSM, UMTS and other wireless networks for providing and exchange of geolocation information. 
 \item \emph{UMTS} - Universal Mobile Telecommunications System - Third generation mobile network based on the GSM standards. 
-- 
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