<p>This master's thesis investigates if it is possible to increase the size of the simulations running on NETSim, Network Element Test Simulator, on a specific hardware and operating system. NETSim is a simulator for operation and maintenance of telecommunication network s.</p><p>The conclusions are that the disk usage is not critical and that it is needless to spend time optimizing disk and file system parameters. The amount of memory used by the simulations increased approximately linear with the size of the simulation. The size of the swap disk space is not a limiting factor.</p> / <p>Detta exsamensarbete undersöker om det är möjligt att öka storleken på simuleringskörningar av NETSim, Network Element Test Simulator, på en specifik hårdvaru- och operativsystemsplattform. NETSim är en simulator för styr och övervakning av telekomnätverk.</p><p>Slutsatserna är att diskanvändandet inte är kritiskt och att det är onödigt att ägna tid åt att optimera disk- och filsystemsparametrar. Minnesutnyttjandet ökar approximativt linjärt med storleken på simuleringarna. Storleken på swapdisken är inte någon begränsande faktor.</p>

This master's thesis investigates if it is possible to increase the size of the simulations running on NETSim, Network Element Test Simulator, on a specific hardware and operating system. NETSim is a simulator for operation and maintenance of telecommunication networks. The conclusions are that the disk usage is not critical and that it is needless to spend time optimizing disk and file system parameters. The amount of memory used by the simulations increased approximately linear with the size of the simulation. The size of the swap disk space is not a limiting factor. / Detta exsamensarbete undersöker om det är möjligt att öka storleken på simuleringskörningar av NETSim, Network Element Test Simulator, på en specifik hårdvaru- och operativsystemsplattform. NETSim är en simulator för styr och övervakning av telekomnätverk. Slutsatserna är att diskanvändandet inte är kritiskt och att det är onödigt att ägna tid åt att optimera disk- och filsystemsparametrar. Minnesutnyttjandet ökar approximativt linjärt med storleken på simuleringarna. Storleken på swapdisken är inte någon begränsande faktor.

Traditionally, communication systems have been dominated by voice applications. Today with the emergence of smartphones, focus has shifted towards packet switched networks. The Internet provides a wide variety of services such as video streaming, web browsing, e-mail etc, and IP trac models are needed in all stages of product development, from early research to system tests. In this thesis, we propose a multi-level model of IP traffic where the user behavior and the actual IP traffic generated from different services are considered as being two independent random processes. The model is based on observations of IP packet header logs from live networks. In this way models can be updated to reflect the ever changing service and end user equipment usage. Thus, the work can be divided into two parts. The first part is concerned with modeling the traffic from different services. A subscriber is interested in enjoying the services provided on the Internet and traffic modeling should reflect the characteristics of these services. An underlying assumption is that different services generate their own characteristic pattern of data. The FFT is used to analyze the packet traces. We show that the traces contains strong periodicities and that some services are more or less deterministic. For some services this strong frequency content is due to the characteristics of cellular network and for other it is actually a programmed behavior of the service. The periodicities indicate that there are strong correlations between individual packets or bursts of packets. The second part is concerned with the user behavior, i.e. how the users access the different services in time. We propose a model based on a Markov renewal process and estimate the model parameters. In order to evaluate the model we compare it to two simpler models. We use model selection, using the model's ability to predict future observations as selection criterion. We show that the proposed Markov renewal model is the best of the three models in this sense. The model selection framework can be used to evaluate future models.

The emerging technologies in the field of telecommunications enable us to access high speed data services through mobile handsets and portable modems over the mobile networks. The recent statistics also shows the use of mobile broad band services are increasing and gaining popularity. In this thesis we have investigated the impact of payload size and data rate on one-way delay and packet loss in operational 3G mobile networks, through network level measurements. To collect the network level traces an experimental testbed is developed. For accurate measurement Endace DAG cards together with GPS synchronization is implemented. Results are gathered from three different commercial mobile operators in Sweden. From the results it is concluded that the combination of maximum payload size and data rate resulted in minimum one-way delay. It is also observed within the big payload size category, that the percentage of packet loss is less as compared to the smaller payload sizes. Such findings will improve efficiency of application developers to meet the challenges of UMTS network conditions.