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Design and simulation of passive optical network PON
Mikauš, Jiří ; Krajsa, Ondřej (referee) ; Reichert, Pavel (advisor)
The aim of master's thesis was to demonstrate chosen PON network in simulation software OPNET Modeler. The work deals with passive optical networks. In particular, solutions that are based on the transmission of Ethernet frames. EPON and 10GEPON standards are described in theoretical section. EPON Standard was introduced already in 2004. Newer 10GEOPN is back compatible, which is ideal as a suitable solution for modern network with a high data rates demands. The practical part describes process of developing network nodes for passive optical network. EPON model was developed in simulation tool, that demonstrates basic features of the standard IEEE 802.3ah. The simulation results are demonstrated in last section.
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Analysis of parameters and communication protocols on radio interface of UMTS networks
Plhák, Jan ; Skořepa, Michal (referee) ; Novotný, Vít (advisor)
These times the third generation cellular networks are getting in use increasingly and they dramatically exceed the parameters of second generation networks. Third generation networks are in contrast to older generations data-oriented, providing better maintenance in data and multimedia services. The most widespread third generation network is the UMTS, designed as succesor of GSM network. Master’s thesis is focused on parameters and communication protocols of radio interface of UMTS network. Parameters of radio interface affect the behaviour of mobile terminal through utilization of network services. This thesis describes individual protocols of radio interface and individual procedures, which the mobile terminal have to perform through its staying in the cell. Theoretical part of this thesis considers description of the UMTS network and individual procedures and parameters. Practical part is focused on measuring the radio interface and individual procedures in real UMTS networks. Some procedures are simulated in network simulation software. This thesis includes a lab task focused on this thema.
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Control of network operation generator from OPNET Modeler environment
Bartl, Milan ; Hošek, Jiří (referee) ; Molnár, Karol (advisor)
In this work an interface between network simulator OPNET Modeler and network operations generator IxChariot is described. The goal is to control the generator by data from an OPNET modeler simulation. More accurately the generator is supposed to produce a data flow with desired settings of DSCP field, which is used to support quality of service mechanism. The goal can be achieved by two possible approaches: using IxChariot TCL API or IxChariot C API. Both of these approaches are described and conclusions are made at the end.
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QoS assurance in wireless networks
Dvořák, Filip ; Vychodil, Petr (referee) ; Vymazal, Michal (advisor)
The bachelor´s work deals with wireless network WiFi and describes basic standards and their supplements. This work is divided into two parts - theoretical and practical. The first part of the work is applied to theoretic description of the best known standards IEEE 802.11 and detailed description of standard 802.11e. The second part of the work takes an interest in proposal and influence of service Wireless Multimedia in wireless network both in real world and in simulation program Opnet Modeler. Obtained results of the measurement are described and summarized in the conclusion.
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Evaluation of influence of UMTS radio access network parameters on network performance using Opnet Modeler simulation environment
Konečný, Zbyněk ; Škorpil, Vladislav (referee) ; Novotný, Vít (advisor)
This bachelor thesis deals with testing the effect of various parameters and their subsequent influence on the operation of the entire UMTS access network. Each simulation will be implemented in Opnet Modeler, which is used for network testing based on packet switching. The aim of this work is the most effective operation of UMTS networks. Since the UMTS network uses a shared radio environment for all users close to one transmitter, the total capacity of one cell is dependent on the size of interference produced by mobile terminals in the cell. Increasing the capacity of cells can be done by properly elected handover. The first part of this work will therefore concern different types of handovers and their impact on the network operation. Nowadays communication through mobile packet networks is becoming more and more important and that is why the second part of this work will focus on the simulation of traffic UMTS networks. It will be simulated by the behavior of individual applications without the use of QoS. Then the application will be assigned to different quality classes and the quality of service will be compared with simulations without using QoS. The conclusion of this work will contain laboratory work, which should partly make the students familiar with the data traffic in the UMTS network through a simulation program – Opnet Modeler.
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NG-PON2 standard implementation in OPNET Modeler
Cymorek, Patrik ; Jurčík, Michal (referee) ; Horváth, Tomáš (advisor)
The aim of this paper is to apprise ourselves with communication in NG-PON2 standard. The first chapter describes optical networks. The second chapter deals with description of NG-PON2 standard and detailed description of downstream and upstream frame. Methods of grant allocation are described at the end of the theoretical section of this paper. Own entities were created in the practical part of this paper and they were used to simulate static and dynamic grant allocation. Designed entities and simulation results were compared with the real network behaviour at the end of the practical part. Designed entities were also used to design a lab exercise in the attachment.
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Quality of Service Assurance in UMTS Network
Nesveda, Marek ; Novotný, Vít (referee) ; Hošek, Jiří (advisor)
The bachelor´s thesis deals with the assurance of the quality of service (QoS) in UMTS (Universal Mobile Telecommunications System) networks. It consists of theoretic and practical parts. The first, theoretic part first describes the quality of service assurance in general and then focuses on the area of the assurance of the quality of service (QoS) in UMTS network environment specifically. It describes the QoS concept in UMTS, typical UMTS network architecture, its components as well as various QoS classes defined in UMTS. It explains parameters that define the quality of service in UMTS network, and describes call set-up for the purposes of transmission between end users. The second, practical part of the bachelor´s thesis describes how to configure a complex UMTS network simulation model in OPNET Modeler, ver..14.5. It gives a detailed description of how to configure each network component and how to set its parameters, in two different scenarios: first including and then excluding QoS. In conclusion, the thesis summarises the results of the simulation in both scenarios, gives their explanations and compares them graphically.
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UMTS network simulation in Opnet Modeler environment and real network operation
Kuchár, Peter ; Molnár, Karol (referee) ; Novotný, Vít (advisor)
This bachelor thesis is devoted to mobile networks and specially to UMTS. First part contains theoretical information about mobile networks, history and present of mobile communication. It continues with comparasion between Node-B specification in the Opnet Modeler 14.5 and real node by 3GPP international community. Second part describes works on simulation and results of measured parameters. Simulation is focused on sensitive services like a VoIP or video. In simulation voice service is used VoIP and few data services running in background. Measurement in real network was executed in several networks which belong to different providers and supports different techniques. In real networks IxChariot was used. IxChariot is the industry’s leading test tool to predict device and system performance under realistic load conditions. Real network results and results from Opnet Modeler 14.5 simulation are practically equal. Aplication of Hamachi in real network did not have influence on the results measured.
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Implementation of Quality of Service into Wireless Networks
Kaman, Štěpán ; Růčka, Lukáš (referee) ; Škorpil, Vladislav (advisor)
Wireless networks are currently the frequent access connection to the local network or the Internet. Until 2005 there was no support in the 802.11 standard priority data and the use of multimedia services in these networks is problematic. Thesis deals with the standard IEEE 802.11 standard and quality of service support including IEEE 802.11e. They discussed methods of access to transmission medium, differences in the MAC sublayer, the reader issues in the transmission of priority data and the requirements for these data. In Opnet Modeler was created wireless network with access points and stations on which they are carried out simulations at different strain of transmitted data. It studied the difference in the use of DCF and EDCF method, used in the network with QoS support. In particular, it examined the behavior of priority voice and video data in both networks. The focus is on key parameters such as throughput, dropping data, packet loss, delay, jitter and the size of broadcasting front. The measured data are analyzed, and differences in the network without the support and promoting the quality of services are compared and evaluated. Part of this work is the role of laboratory in the Opnet Modeler.
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Effective utilization of converged network
Nesveda, Marek ; Vychodil, Petr (referee) ; Škorpil, Vladislav (advisor)
The Master´s thesis deals with the field of converged networks and their effective utilization, focusing specifically on telematic networks. For modelling of a specific application, the field of vehicle telematics has been chosen. The thesis consists of two series of simulations performed in Opnet Modeler network simulator. The first theoretic part gave an overview of protocols used in converged networks, with a more detailed description of routing protocols. The attention also centred on the mechanisms for assuring the quality of service in IP. The subsequent practical part consisted in creating the simulation of a converged telematic network in Opnet Modeler network simulator, configuration of scenarios for assuring QoS using RSVP and DSCP protocols and the simulation itself. The results of the simulations for both scenarios were compared and represented in graphic form. The second theoretic part described queueing disciplines, as well as congestion control and congestion avoidance mechanisms. The corresponding practical part compared FIFO, PQ and WFQ queueing algorithms within the same simulated converged telematic network, using DSCP protocol scenario, which gave much better results in the first series of simulations. Again, the results of the simulations were compared and represented in graphic form.
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