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-
-\title{OAI EPC current development}
-\author{Sebastien ROUX\\Eurecom\\sebastien.roux@eurecom.fr}
-
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-
-\begin{document}
-\maketitle
-\tableofcontents
-\printnomenclature[2cm]
-
-\chapter*{MME and S+P-Gateway} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{MME and S+P-Gateway}
-
-% \nomenclature{MME}{Mobility Management Entity}
-% \nomenclature{S-GW}{Serving Gateway}
-% \nomenclature{P-GW}{PDN Gateway}
-\begin{figure}[H]
-\begin{center}
-\begin{tikzpicture}
-\tikzstyle{every node}=[font=\footnotesize]
-\matrix (table) [row sep=0.5cm, column sep={3.2cm,between origins}, table,text width=3mm,name=table] {
- & & &\\
- & & &\\
- & & &\\
- & & &\\
- & & &\\
-};
-\node(MMEAPP)[cps,draw,fit=(table-1-1)(table-1-2),table nodes]{MME Application};
-\node(SPGW)[cps,draw,fit=(table-1-3)(table-1-4),table nodes]{S+P-GW Application};
-\node(NAS)[cps,draw,fit=(table-2-2),table nodes]{NAS};
-\node(S6A)[dashed,cps,draw,fit=(table-3-1),table nodes]{S6a/Diameter};
-\node(S1AP)[cps,draw,fit=(table-3-2),table nodes]{S1-MME/S1AP};
-\node(S1U)[ups,draw,fit=(table-3-3),table nodes]{S1-U/GTPU};
-\node(SGI)[dashed,ups,draw,fit=(table-3-4),table nodes]{SGi};
-\node(SCTP)[stdlinux,draw,fit=(table-4-1)(table-4-2),table nodes]{SCTP};
-\node(UDP)[stdlinux,draw,fit=(table-4-3),table nodes]{UDP};
-\node(IP)[stdlinux,draw,fit=(table-5-1)(table-5-2)(table-5-3)(table-5-4),table nodes]{IP};
-
-\draw[<->, dashed, draw=red] (MMEAPP) -- node(arrow1)[above, align=center]{S11}(SPGW);
-\draw[<-,dashed] (S1U) -- (SPGW.south-|S1U);
-\draw[<-,dashed] (SGI) -- (SPGW.south-|SGI);
-\draw[-] (S6A) -- (MMEAPP.south-|S6A);
-\draw[-] (NAS) -- (MMEAPP.south-|NAS);
-\draw[-] (S1AP) -- (NAS);
-\draw[-] (S1U) -- (SGI);
-\draw[-] (S1U) -- (UDP);
-\draw[-] (S1AP) -- (SCTP.north-|S1AP);
-\draw[-] (S6A) -- (SCTP.north-|S6A);
-\draw[-] (SCTP) -- (IP.north-|SCTP);
-\draw[-] (UDP) -- (IP.north-|UDP);
-\draw[-] (SGI) -- (IP.north-|SGI);
-\draw[-] (MMEAPP.south) |- (S1AP.west);
-
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-
-\node[cps, minimum width=5mm,minimum height=5mm,below=of IP.south west,anchor=west](l1){};
-\node[right=2mm of l1](ct1) {Control Plane};
-\node[ups,minimum width=5mm,minimum height=5mm,below=0.3cm of l1](l2){};
-\node[below=0.3cm of ct1, right=2mm of l2](ct2) {User Plane};
-\node[stdlinux,minimum width=5mm,minimum height=5mm,below=0.3cm of l2](l3){};
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-\draw[minimum width=5mm,minimum height=5mm,below=0.3cm of l3,<->,dashed, draw=red]
-($(l3.south west) - (0,0.55cm)$) -- node(l4){} ($(l3.south east) - (0,0.55cm)$);
-\node[right=2mm of l4.north east](ct4) {Abstraction link};
-\draw[minimum width=5mm,minimum height=5mm,below=0.3cm of l4,->,dashed]
-($(l4.south west) - (0,0.25cm)$) -- node(l5){} ($(l4.south east) - (0,0.25cm)$);
-\node[right=2mm of l5.north east](ct5) {Control};
-\node[draw,fit=(ct1)(l1)(ct2)(l2)(ct3)(l3)(ct4)(l4)(ct5)(l5)] {};
-
-\end{tikzpicture}
-\caption{MME and S+P-GW architecture} \label{fig:MMEoverall}
-\end{center}
-\end{figure}
-
-Figure \ref{fig:MMEoverall} shows the targeted implementation of Eurecom
-EPC.
-
-\chapter*{S1AP layer} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{S1AP layer}
-
-\nomenclature{S1AP}{S1 Application Protocol}S1AP layer relies on
-\nomenclature{ASN.1}{Abstract Syntax Notation.1}ASN.1 messages
-description. Generating C code from the specification
-implies three steps:
-\begin{enumerate}
-\item Modify .asn files to match tools limitation.
-\item Generate \nomenclature{IE}{Informations Elements}IEs with the help of the asn1c free tool.
-\item Use the provided script which generates \nomenclature{PDU}{Protocol Data Unit}PDU codec\footnote{Encode/Decode}.
-\end{enumerate}
-
-\chapter*{Inter-task interface} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{Inter-task interface}
-
-\section{Concurrency}
-
-Code divided in layers should be able to be executed in parallel to use the full
-\nomenclature{CPU}{Control Processing Unit}CPUs power. We can achieve better performance
-by using some mechanisms that runs part of code in parallel on UNIX platforms:
-\begin{itemize}
-\item Multi-process: no link between processes, usage of sockets or pipes is mandatory.
-\item Forks: code is duplicated and data are stored in different spaces.
-\item Threads: only code is duplicated, data space is shared between processes
-\end{itemize}
-Data synchronization is the first issue to think about when using such mechanisms.
-
-\section{Overall description}
-
-A single \nomenclature{API}{Application Programming Interface}API
-(called ITTI\footnote{InTer-Task Interface}) is used to manage messages
-exchanged between the tasks which are running on separate threads.
-This will lead in better usage of multi-core environments.
-\begin{figure}[h]
- \begin{center}
- \begin{tikzpicture}
- \node[](t1) { Task A };
- \node[below=of t1,yshift=7mm,font=\tiny](s1) { send msg to task };
- \node[queue,rotate=90,below=of t1.south,anchor=top](c1) {};
- \node[right=of t1,xshift=15mm](t2) { Task B };
- \node[below=of t2,yshift=7mm,font=\tiny](r2) { recv msg from task };
- \node[queue,rotate=90,below=of t2.south,anchor=top](c2) {};
- \node[dashed,fit=(c1)(t1)(s1),draw](T1){};
- \node[dashed,fit=(c2)(t2)(r2),draw](T2){};
- \node[draw](ITTI) at ($(T1)!0.5!(T2) + (0, -2.3)$){ITTI interface};
- \draw[->] (T1) |- (ITTI);
- \draw[->] (ITTI.east) -| (c2.bottom);
- \draw[->] (c2.east) -- (r2);
- \node[queue,rotate=90,minimum width=5mm,minimum height=7mm,right=of c2,anchor=top,yshift=-15mm](c3) {};
- \node[dashed,rectangle,minimum width=5mm,minimum height=5mm,draw,below=7mm of c3,anchor=east](c4) {};
- \node[right=4mm of c3.shape center](x3){Message queue};
- \node[right=4mm of c4.center](x4){Thread};
- \node[draw,fit=(c3)(x3)(x4)(c4)](T4){};
- \end{tikzpicture}
- \caption{Overall process} \label{fig:Overall process}
- \end{center}
-\end{figure}
-Figure \ref{fig:Overall process} describes the basic fonctionnement of the inter-task interface.
-A message sent from
-Task A is en-queued to the message queue belonging to the target task. Note that
-tasks can send messages to themselves. Another API (See Figure \ref{fig:Broadcasting process}) defines broadcast messaging
-where any task can send a broadcast message to every other task.
-\begin{figure}[H]
- \begin{center}
- \begin{tikzpicture}
- \node[](t1) { Task A };
- \node[below=of t1,yshift=7mm,font=\tiny](s1) { send broadcast msg };
- \node[queue,rotate=90,below=of t1.south,anchor=top](c1) {};
-
- \node[right=of t1,xshift=35mm](t2) { Task B };
- \node[below=of t2,yshift=7mm,font=\tiny](r2) { recv msg from task };
- \node[queue,rotate=90,below=of t2.south,anchor=top](c2) {};
-
- \node[right=of t2,xshift=15mm](tn) { Task N };
- \node[below=of tn,yshift=7mm,font=\tiny](rn) { recv msg from task };
- \node[queue,rotate=90,below=of tn.south,anchor=top](cn) {};
- \node[dashed,fit=(c1)(t1)(s1),draw](T1){};
- \node[dashed,fit=(c2)(t2)(r2),draw](T2){};
- \node[dashed,fit=(cn)(tn)(rn),draw](TN){};
-
- \node[](ITTI) at ($(T2)!0.5!(TN)$){...};
- \node[draw](ITTI) at ($(T1)!0.5!(T2) + (0, -2.3)$){ITTI interface};
- \draw[->] (T1) |- (ITTI);
- \draw[->] (ITTI.east) -| (c2.bottom);
- \draw[->] (ITTI.east) -| (cn.bottom);
- \draw[->] (c2.east) -- (r2);
- \draw[->] (cn.east) -- (rn);
- \node[queue,rotate=90,minimum width=5mm,minimum height=7mm,below=23mm of T1](c3) {};
- \node[dashed,rectangle,minimum width=5mm,minimum height=5mm,draw,below=7mm of c3,anchor=east](c4) {};
- \node[right=4mm of c3.shape center](x3){Message queue};
- \node[right=4mm of c4.center](x4){Thread};
- \node[draw,fit=(c3)(x3)(x4)(c4)](T4){};
- \end{tikzpicture}
- \caption{Broadcasting process} \label{fig:Broadcasting process}
- \end{center}
-\end{figure}
-Once a task received a new message and if the task is in sleep mode (i.e. not handling
-any message), the task is waken up and the message is de-queued. We can imagine a limit
-in number of parallel tasks, for example N+1 CPU's. Architectures using hyper-threading
-mechanism can have this value extended to 2 x CPU's.
-Every task is running in a separated pthread, awaiting for new messages to handle.
-
-\section{Signals from kernel}
-
-Handling of signals from kernel is the more critical part as a signal can be raised
-at any moment and will interrupt one of the running thread. Used signals should be restricted
-to a single task that will handle them (using the POSIX sigmask function) . Moreover, it isn't
-thread-safe to use mutexes inside a signal handler, a synchronization flag should be used to
-notify the signal handler task. This task will then send the appropriate message
-to the right task. For example, handling of signals can be done in the main thread or by a background task
-scheduled periodically.
-To overcome these issues, sigtimedwait and sigwaitinfo API functions can be used
-to wait for a signal to happen. Signals will be received in the thread context, as far as
-other threads block these signals.
-
-\section{Priority handling}
-
-Usage of message prioritization enables tasks to send critical messages with a faster
-delivery time regarding other messages en-queued for the target task.
-For now only seven priority levels can be applied when defining tasks:
-\begin{itemize}
-\item TASK\_PRIORITY\_MAX
-\item TASK\_PRIORITY\_MAX\_LEAST
-\item TASK\_PRIORITY\_MED\_PLUS
-\item TASK\_PRIORITY\_MED
-\item TASK\_PRIORITY\_MED\_LEAST
-\item TASK\_PRIORITY\_MIN\_PLUS
-\item TASK\_PRIORITY\_MIN
-\end{itemize}
-For now message priority does not involve any suitable scheduler: every time a message is de-queued,
-message priority of other messages is incremented by one.
-
-\section{Message scheduling}
-Currently, there is no software limit on the maximum number of threads executed in parallel.
-When a task sends a message, it is en-queued in the right message queue, belonging to
-the target task. The queue is a double-linked list. A mutex prevents other tasks
-from modifying this queue while a task is en-queueing or removing a message.
-
-\section{Message definition}
-Messages are defined using a single macro that adds the message to the ids enumeration
-and maps data of the message to the union of messages.
-\begin{lstlisting}
-MESSAGE_DEF(S1AP_SCTP_NEW_MESSAGE_IND, TASK_PRIORITY_MED, S1apSctpNewMessageInd s1apSctpNewMessageInd)
-\end{lstlisting}
-and the associated data:
-\begin{lstlisting}
-typedef struct {
- uint8_t *buffer; ///< SCTP buffer
- uint32_t bufLen; ///< SCTP buffer length
- int32_t assocId; ///< SCTP physical association ID
- uint8_t stream; ///< Stream number on which data had been received
- uint16_t instreams; ///< Number of input streams for the SCTP connection between peers
- uint16_t outstreams; ///< Number of output streams for the SCTP connection between peers
-} S1apSctpNewMessageInd;
-\end{lstlisting}
-\section{Task message handling}
-\begin{lstlisting}
-void* s1ap_mme_thread(void *args) {
- while(1) {
- /* Trying to fetch a message from the message queue.
- * If the queue is empty, this function will block till a
- * message is sent to the task.
- */
- receive_msg(TASK_S1AP, &receivedMessage);
- assert(receivedMessage != NULL);
- switch(receivedMessage->messageId) {
- case S1AP_SCTP_NEW_MESSAGE_IND:
- {
- //Some processing
- } break;
- default:
- {
- S1AP_DEBUG("Unkwnon message ID %d\n", receivedMessage->messageId);
- } break;
- }
- free(receivedMessage);
- receivedMessage = NULL;
- }
- return NULL;
-}
-\end{lstlisting}
-\section{Messages logging}
-\begin{figure}[H]
- \begin{center}
- \begin{tikzpicture}
- \node[](p1) { Process };
- \node[below=5mm of p1](i1) { ITTI };
- \node[queue,right=of i1,rotate=90,anchor=base](q1) {};
- \node[draw,fit=(i1)(q1)](s1) { };
- \node[fit=(p1)(i1)(q1)(s1),draw](T1){};
- \node[queue,fill=red!30,right=of s1.east,yshift=-5mm](c1) { TCP socket };
- \node[right=of c1](r1){ Remote host n };
- \node[fit=(r1),draw](R2){};
- \node[queue,fill=red!30,right=of s1.east,yshift=5mm](c2) { TCP socket };
- \node[right=of c2](r1){ Remote host 1 };
- \node[fit=(r1),draw](R1){};
- \draw[-] (q1.base) -- ++ (1,0) -| ++ (0,.6) -- (c2.west);
- \draw[-] (c2) -- (R1);
- \draw[-] (q1.base) -- ++ (1,0) -| ++ (0,-.4) -- (c1.west);
- \draw[-] (c1) -- (R2);
- \end{tikzpicture}
- \caption{Remote debugging} \label{fig:Remote debugging}
- \end{center}
-\end{figure}
-Logging of inter-tasks messages can be setup using an external tool that will be
-connected to the ITTI. Based on an array of dumped messages, they are serialized
-to produce an array of byte sent over a socket. A remote tool can then decode
-messages and display fields, message number, time.\\
-Additionaly, logs from standard output can be printed over the debug tool.
-Multi-user debugging on only one running process can be achieved using this interface.
-Messages to dump should be queued for a pure asynchronous communication between the
-dump task and the remote hosts.
-Another interesting feature could be to send a message to a task from an host,
-allowing run-time re-configuration.
-The C pre-processor can be used to generate messages definition (using
-\nomenclature{XML}{Extensible Markup Language}XML templates
-for example).\\
-\section{Limitations}
-Data pointers belonging to one task should never be passed to another task.
-The presented mechanism does not prevent a task from being locked. In such a case,
-the blocked task will no more handle messages incoming from other tasks.
-
-\section{Benefits}
-\begin{itemize}
- \item Only a single entry point between all tasks (easy inter-task communication tracking and debugging).
- \item Usage of message queues enables parallelization of layers.
- \item Message prioritization and scheduling.
- \item Protection of data between threads is done by the API at an higher level.
-\end{itemize}
-
-\section{To do}
-\begin{itemize}
- \item Implement a priority based scheduler. Currently the queue of messages works as a FIFO.
- \item Limit the number of tasks thread that can be run in parallel
-\end{itemize}
-
-\chapter*{Signal API} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{Signal API}
-
-On LINUX platforms, processes will receive signals comming from Kernel.
-A single blocking entry point handles all used signals that are requested by the
-MME. The main application thread is reserved to signal handling as this thread will
-be blocked till a new signal is ready for handling.\\
-Using this method prevents threads from being interrupted by signals handler which
-can interrupt the thread at any time and as a consequence create some misbehaving
-in threads contexts.
-Following is a sample list of signals handled:
-\begin{itemize}
- \item SIGABRT This is signal is sent to the process when abort() function is called
- within the process and kill the process. Process can for example display the stack
- once this signal is received.
- \item SIGRTMIN This signal is used by the timer API and is raised everytime a
- timer has expired.
-\end{itemize}
-Till now there is no way for tasks to request a new signal.
-
-\chapter*{Timer API} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{Timer API}
-
-Timer API doesn't consist of a task (i.e. tasks cannot send messages to it).
-Handling of UNIX signal associated to the timers is a Real-time signal with an id (SIGRTMIN)
-depending on the platform. Management of this signal is done by the signal interface
-and developpers should not care about handling timer signals incoming from Kernel.
-Once a timer has expired the task which has requested it will receive the TIMER\_HAS\_EXPIRED
-signal.
-Note that timer\_id is of type long and thus its size is platform specific.
-
-\section{Timer types}
-
-\begin{itemize}
- \item TIMER\_ONE\_SHOT After expiry and its associated signal, the timer is removed.
- \item TIMER\_PERIODIC The timer is automatically reloaded on each expiry while the task
-which has setup this timer doesn't cancel it.
-\end{itemize}
-
-\section{Requesting a new signal}
-Any task can request a new signal by invoking the following API:
-\begin{lstlisting}
-int timer_setup(
- uint32_t interval_sec,
- uint32_t interval_us,
- task_id_t task_id,
- timer_type_t type,
- long *timer_id);
-\end{lstlisting}
-
-Note that timer id is a unique identifier to distinguish timers.
-
-\section{Disable and remove a timer}
-
-Disable and remove the timer referenced by timer\_id.
-\begin{lstlisting}
-int timer_remove(long timer_id);
-\end{lstlisting}
-
-\section{Timer signal expiry}
-
-Once the signal dispatcher receives the SIGRTMIN signal, a new signal is sent
-to the task which has requested the timer. Contrary to signal request, timer
-expiry notification is achieved using the intertask mechanism.
-The signal data associated to this event follows:
-\begin{lstlisting}
-typedef struct {
- long timer_id;
-} timer_has_expired_t;
-\end{lstlisting}
-
-\chapter*{Compiling core EPC} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{Compiling core EPC}
-
-The core EPC software has been tested on Ubuntu 12.04LTS x86 and ia64.
-Before compiling the core EPC, some packages should be installed on the platform.
-
-\section{Dependencies}
-
-\begin{itemize}
- \item libsctp-dev
- \item libpthread-dev
- \item automake and autoconf
- \item libtoolize
- \item gcc, g++, make
- \item flex and bison
- \item openssl-dev
- \item asn1c (see section \ref{sec:asn1c})
- \item freediameter (see section \ref{sec:freediameter}) and gnutls 3.1.0
- (see section \ref{sec:gnutls})
-\end{itemize}
-Command-line to install the required packages:
-\begin{lstlisting}
-sudo apt-get install cmake make gcc flex bison \
-libsctp1 libsctp-dev libidn2-0-dev libidn11-dev \
-libmysqlclient-dev libxml2-dev swig python-dev \
-cmake-curses-gui valgrind guile-2.0-dev \
-libgmp-dev libgcrypt11-dev gdb unzip \
-libtasn1-3-dev g++ autoconf automake \
-openssl-dev -y
-\end{lstlisting}
-
-\subsection{ASN1c}
-\label{sec:asn1c}
-
-\subsection{gnutls}
-\label{sec:gnutls}
-
-The GNUTls library is only used by freediameter for certificate handling and as a
-consequence should be installed before trying to compile the freediameter library.
-\begin{lstlisting}
-wget ftp://ftp.gnutls.org/gcrypt/gnutls/v3.1/gnutls-3.1.0.tar.xz
-tar -xvf gnutls-3.1.0.tar.xz
-cd gnutls-3.1.0/
-./configure LDFLAGS='-L/usr/local/lib'
-make
-sudo make install
-\end{lstlisting}
-Note: when dependencies are installed in /usr/local instead of /usr,
-LDFLAGS has to be overriden with the path to libraries when configuring the package:
-LDFLAGS='-L/usr/local/lib'.
-
-\subsection{freediameter}
-\label{sec:freediameter}
-Freediameter is the package that provides diameter capabilities to the MME/HSS.
-On top of this stack, S6A avp dictionnary is used to enable a compliant S6A interface.
-\begin{lstlisting}
-wget http://www.freediameter.net/hg/freeDiameter/archive/1.1.5.tar.gz
-tar -xvf 1.1.5.tar.gz
-cd freeDiameter-1.1.5
-patch -p1 < ../../freediameter-1.1.5.patch
-mkdir build
-cd build
-cmake ../
-make
-make test
-sudo make install
-\end{lstlisting}
-If you want ot install this package in /usr instead of /usr/local,\\
--DCMAKE\_INSTALL\_PREFIX:PATH=/usr should be passed to cmake at configuration.
-
-\chapter*{System configuration} \stepcounter{chapter}
-\addcontentsline{toc}{chapter}{System configuration}
-
-Currently there is two ways to configure the system:
-\begin{itemize}
- \item Compilation configuration
- \item Boot-up configuration
-\end{itemize}
-In the first type of configuration, the single system configuration structure
-is filled in with default values that can be found in the mme\_default\_values.h
-header file.\\
-When Boot-up configuration is used, a configuration file is passed to the process
-by using the either -c filename.conf or --conf=filename.conf. This file is then parsed
-by the bison interpreter and values are replaced in the global system configuration
-structure.
-
-\section{Global MME parameters}
-
-\subsection{Relative MME capacity}
-Even though this parameter is not used by the MME for controlling the MME load
-balancing within a pool (at least for now), the parameter has to be to forwarded
-to the eNBs during association procedure.
-This parameter is encoded on 8bits, acceptable values going from 0 to 255.
-(Default value = 15)
-\begin{lstlisting}
-RELATIVE_CAPACITY = 10;
-\end{lstlisting}
-
-\subsection{Maximum number of UE}
-\label{sec:Maximum number of UE}
-This limit is present here only for debug purposes and is used to restrict
-the number of served UE the MME can handle. In real network another mechanism
-will trigger an MME overload for certain eNBs and will restrict certain types of
-traffic. Such a mechanism would imply the Relative MME capacity.
-\begin{lstlisting}
-MAXUE = 100;
-\end{lstlisting}
-
-\subsection{Maximum number of eNB}
-Refer to \ref{sec:Maximum number of UE}.
-\begin{lstlisting}
-MAXENB = 10;
-\end{lstlisting}
-
-\subsection{Tracking Area Identity}
-\nomenclature{TAI}{Tracking Area Identity}TAI is the concatenation of
-\nomenclature{MCC}{Mobile Country Code}MCC, \nomenclature{MNC}{Mobile Network Code}MNC and
-\nomenclature{TAC}{Tracking Area Code}TAC.
-The TAC uniquely identifies a PLMN within a Cell Id.
-\begin{lstlisting}
-PLMN = mcc.mnc:tac;
-\end{lstlisting}
-Multiple values can be given using a comma separator. Example:
-\begin{lstlisting}
-PLMN = 208.38:0,209.130:4,208.35:8;
-\end{lstlisting}
-
-\subsection{MME Code}
-A list of a maximum of 256 values can be provided.
-\nomenclature{MMEC}{MME Code}MME Code is encoded on 8 bits,
-so acceptable range is: 0 to 255.
-Example:
-\begin{lstlisting}
-MME_CODE = 30,56,1,8;
-\end{lstlisting}
-
-\subsection{MME Group Id}
-A list of a maximum of 65356 values can be provided.
-\nomenclature{MMEGID}{MME Group Id}MME Group Id is encoded on 16 bits,
-so acceptable range is: 0 to 65535.
-Example:
-\begin{lstlisting}
-MME_GID = 3,4,5,30,8,9,50021;
-\end{lstlisting}
-
-\section{Intertask parameters}
-\subsection{Queue size per task}
-To restrict the number of messages in queues or to detect a possible MME overload,
-an upper bound for the queue size can be defined like this:
-\begin{lstlisting}
-ITTI_QUEUE_SIZE = 2000000;
-\end{lstlisting}
-This parameter is expressed in bytes. Note that all messages exchanged by tasks
-have the same size.
-
-\section{SCTP parameters}
-\subsection{IN/OUT streams number}
-The number of input/output streams can be configured to limit the number of streams
-used for UE-associated signalling. Note that stream with id = 0 is reserved for
-non-UE associated signalling. At least two streams should be used by the MME.
-(Default value = 64/64 streams)
-\begin{lstlisting}
-SCTP_INSTREAMS = 32;
-SCTP_OUTSTREAMS = 32;
-\end{lstlisting}
-
-\section{S1AP parameters}
-\subsection{Outcome timer}
-Once an outcome is sent from MME to eNB, the MME locally starts a timer to abort
-the procedure and release UE contexts if the expected answer to this outcome is not
-received at the expiry of this timer.\\
-This timer is expressed in seconds. (Default value = 5 seconds)
-\begin{lstlisting}
-S1AP_OUTCOME_TIMER = 10;
-\end{lstlisting}
-
-\section{Network interfaces parameters}
-
-Three paramters can be tuned in the configuration file:
-\begin{itemize}
- \item Interface Name: The related interface will be bind to this interface name
- \item IP address: Currently only IPv4 address is allowed
- \item IP netwmask: Netmask for the LAN
-\end{itemize}
-These three paramters can be setup for five different interfaces used:
-\begin{itemize}
- \item SGW interface for S11
- \item SGW interface for S1U/S12/S4 in user plane
- \item SGW interface for S5/S8 in user plane
- \item PGW interface for S5/S8
- \item PGW interface for SGi
- \item MME interface for S1-MME in control plane
-\end{itemize}
-Example of configuration:
-\begin{lstlisting}
-# ------- Interfaces definitions
-SGW_INTERFACE_NAME_FOR_S11 = "s11sgw";
-SGW_IP_ADDRESS_FOR_S11 = "192.168.10.1";
-SGW_IP_NETMASK_FOR_S11 = 24;
-
-SGW_INTERFACE_NAME_FOR_S1U_S12_S4_UP = "upsgw0";
-SGW_IP_ADDRESS_FOR_S1U_S12_S4_UP = "192.168.1.1";
-SGW_IP_NETMASK_FOR_S1U_S12_S4_UP = 24;
-
-SGW_INTERFACE_NAME_FOR_S5_S8_UP = "upsgw1";
-SGW_IP_ADDRESS_FOR_S5_S8_UP = "192.168.5.2";
-SGW_IP_NETMASK_FOR_S5_S8_UP = 24;
-
-PGW_INTERFACE_NAME_FOR_S5_S8 = "uppgw0";
-PGW_IP_ADDRESS_FOR_S5_S8 = "192.168.5.1";
-PGW_IP_NETMASK_FOR_S5_S8 = 24;
-
-PGW_INTERFACE_NAME_FOR_SGI = "eth1";
-PGW_IP_ADDR_FOR_SGI = "192.168.12.30";
-PGW_IP_NETMASK_FOR_SGI = 24;
-
-MME_INTERFACE_NAME_FOR_S1_MME = "cpmme0";
-MME_IP_ADDRESS_FOR_S1_MME = "192.168.11.1";
-MME_IP_NETMASK_FOR_S1_MME = 24;
-\end{lstlisting}
-
-\end{document}
diff --git a/openair3/DOCS/Latex/EPC/Makefile b/openair3/DOCS/Latex/EPC/Makefile
deleted file mode 100644
index 0f0e799384356090b6176333f4ae703ece086b86..0000000000000000000000000000000000000000
--- a/openair3/DOCS/Latex/EPC/Makefile
+++ /dev/null
@@ -1,30 +0,0 @@
-#/*
-# * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
-# * contributor license agreements. See the NOTICE file distributed with
-# * this work for additional information regarding copyright ownership.
-# * The OpenAirInterface Software Alliance licenses this file to You under
-# * the OAI Public License, Version 1.1 (the "License"); you may not use this file
-# * except in compliance with the License.
-# * You may obtain a copy of the License at
-# *
-# * http://www.openairinterface.org/?page_id=698
-# *
-# * Unless required by applicable law or agreed to in writing, software
-# * distributed under the License is distributed on an "AS IS" BASIS,
-# * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# * See the License for the specific language governing permissions and
-# * limitations under the License.
-# *-------------------------------------------------------------------------------
-# * For more information about the OpenAirInterface (OAI) Software Alliance:
-# * contact@openairinterface.org
-# */
-
-MYFILE=EPC
-
-all:
- pdflatex $(MYFILE).tex
- pdflatex $(MYFILE).tex
- makeindex $(MYFILE).nlo -s nomencl.ist -o $(MYFILE).nls
- pdflatex $(MYFILE).tex
-
-.PHONY: all