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authorRefik Hadzialic2012-07-22 17:54:40 +0200
committerRefik Hadzialic2012-07-22 17:54:40 +0200
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Writing RRLP
Diffstat (limited to 'vorlagen/thesis/src/kapitel_x.tex')
-rw-r--r--vorlagen/thesis/src/kapitel_x.tex113
1 files changed, 105 insertions, 8 deletions
diff --git a/vorlagen/thesis/src/kapitel_x.tex b/vorlagen/thesis/src/kapitel_x.tex
index 5020dc3..343581d 100644
--- a/vorlagen/thesis/src/kapitel_x.tex
+++ b/vorlagen/thesis/src/kapitel_x.tex
@@ -1424,22 +1424,22 @@ and ETSI TS 144 031 \citep{49.031V8.1.0} \citep{ETSITS144031}. ASN.1 is a conven
for denoting the abstract syntax of data used inside of protocols or data
structures \citep[Chapter 8]{sharp2008principles} \citep{ITU-TX.680}. In other words, using ASN.1 it is possible
to describe data in an indepedent representation of programming languages in which a protocol is implemented.
-In this section only some of the used parts of the RRLP protocol
+In this section, only some of the used parts of the RRLP protocol
inside of this thesis will be presented, more details can be found in the
technical specifications \citep{49.031V8.1.0} \citep{ETSITS144031}. Structure
-of the RRLP message can be seen in listing \ref{lst:RRLP}.
-\newpage
+of the RRLP message encoding for transmission can be seen in listing \ref{lst:RRLP}.
+Further details on some of the unknown terms are given in listings
+\ref{lst:RRLPReq} and \ref{lst:RRLPReqData}.
\begin{lstlisting}[label=lst:RRLP,
-caption={\textbf{Structure of RRLP message in ASN.1 notation}},
-backgroundcolor=\color{light-gray}]
+caption={\textbf{Structure of the RRLP message in ASN.1}},
+backgroundcolor=\color{light-gray},
+basicstyle={\scriptsize\ttfamily}]
RRLP-Messages
-- { RRLP-messages }
DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
-
-
IMPORTS
MsrPosition-Req, MsrPosition-Rsp, AssistanceData,
ProtocolError
@@ -1462,9 +1462,106 @@ RRLP-Component ::= CHOICE {
posCapabilityReq PosCapability-Req,
posCapabilityRsp PosCapability-Rsp
}
-
END
\end{lstlisting}
+An example how to build an RRLP request packet will be given,
+then it will be encoded using Packed Encoding Rules (PER). PER is one of the telecommunication
+standards used for encoding and decoding messages inside of protocols specified in the ASN.1
+notation \citep{ITU-TX.691}.
+\begin{lstlisting}[label=lst:RRLPReq,
+caption={\textbf{Structure of the RRLP request in ASN.1}},
+backgroundcolor=\color{light-gray},
+basicstyle=\scriptsize\ttfamily]
+-- Measurement Position request component
+
+MsrPosition-Req ::= SEQUENCE {
+ positionInstruct PositionInstruct,
+ referenceAssistData ReferenceAssistData OPTIONAL,
+ msrAssistData MsrAssistData OPTIONAL,
+ systemInfoAssistData SystemInfoAssistData OPTIONAL,
+ gps-AssistData GPS-AssistData OPTIONAL,
+ extensionContainer ExtensionContainer OPTIONAL,
+ ...,
+ -- Release 98 extension element
+ rel98-MsrPosition-Req-extension Rel98-MsrPosition-Req-Extension OPTIONAL
+}
+\end{lstlisting}
+\begin{lstlisting}[label=lst:RRLPReqData,
+caption={\textbf{Structure of the data types from RRLP request in ASN.1}},
+backgroundcolor=\color{light-gray},
+basicstyle=\scriptsize\ttfamily]
+-- Position instructions
+PositionInstruct ::= SEQUENCE {
+ -- Method type
+ methodType MethodType,
+ positionMethod PositionMethod,
+ measureResponseTime MeasureResponseTime,
+ useMultipleSets UseMultipleSets,
+ environmentCharacter EnvironmentCharacter OPTIONAL
+}
+
+--
+MethodType ::= CHOICE {
+ msAssisted AccuracyOpt, -- accuracy is optional
+ msBased Accuracy, -- accuracy is mandatory
+ msBasedPref Accuracy, -- accuracy is mandatory
+ msAssistedPref Accuracy -- accuracy is mandatory
+}
+
+-- Accuracy of the location estimation
+AccuracyOpt ::= SEQUENCE {
+ accuracy Accuracy OPTIONAL
+}
+
+-- The values of this field are defined in 3GPP TS 03.32 (Uncertainty code)
+Accuracy ::= INTEGER (0..127)
+
+-- Position Method
+PositionMethod ::= ENUMERATED {
+ eotd (0),
+ gps (1),
+ gpsOrEOTD (2)
+}
+
+-- Measurement request response time
+MeasureResponseTime ::= INTEGER (0..7)
+
+-- useMultiple Sets, FFS!
+UseMultipleSets ::= ENUMERATED {
+ multipleSets (0), -- multiple sets are allowed
+ oneSet (1) -- sending of multiple is not allowed
+}
+\end{lstlisting}
+PER is intended for use in circumstances where
+minimizing the size of the representation of values is the major concern
+in the choice of encoding rules \citep{ITU-TX.691}. In other words, it compresses the data
+in the PDU packets by limiting the bit field length to the minimal amount of
+bits required to define the minimal and maximal values defined in the standard.
+There are two variations of PER,
+aligned and nonaligned \citep{ITU-TX.691}. In the RRLP protocol the aligned type of PER
+is used. The major difference between aligned and nonaligned PER lies in the fact that some
+data structures are aligned on octet boundaries, i.e. there are some wasted padding bits which
+are set to zero if not used.
+
+Before proceeding with an example, summary for the used ASN.1 type
+elements will be provided otherwise it is not possible to proceed with an example
+RRLP request. A type of \textbf{SEQUENCE} is used to
+reference a ``fixed, ordered list of types (some of which may be declared to be
+optional); each value of the sequence type is an ordered list of values,
+one from each component type'' \citep{ITU-TX.691} where the elements inside
+IE (fields) of \textbf{OPTIONAL} type do not need to be included and are not mandatory.
+Variables defined by \textbf{CHOICE} are used to reference ``a list of distinct types;
+each value of the choice type is derived from the value of one of the
+component types'' \citep{ITU-TX.691}, i.e. only one element is selected from the
+list and the elements of the list are defined according to their variable type.
+Variables of type \textbf{ENUMERATED} are ``simple types whose values are given
+distinct identifiers as part of the type notation'' \citep{ITU-TX.691}, these types
+are used to distinguish a choice by identifying it with an incremented number where the
+first element is of value zero. Veriables defined by \textbf{INTEGER} are of the ``simple
+type with distinguished values which are the positive and negative whole numbers,
+including zero (as a single value)'' \citep{ITU-TX.691}.
+
+At this point the meaning of RRLP data elements will be given. The IE
\subsection{RRLP Assistance data}