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Design of the Aero Center Network Infrastructure
Kadlec, Vojtěch ; Novotný, Vít (referee) ; Ondrák, Viktor (advisor)
The bachelor's thesis deals with the design of the network infrastructure of the company Aero Invest s.r.o. The design consist of creating complete documentation for the subsequent implementation of a computer network according to the requirements of the investor. The design contains both active and passive elements and the method of security technologies.
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Design of reliable enterprise networks with service quality support
Kiška, Martin ; Koutný, Martin (referee) ; Novotný, Vít (advisor)
This work deals with creating a reliable corporate network and its variety capabilities against loops and supporting QoS on link and network layer. On the basis of theoretical knowledge is designed an experimental network in the laboratory of Institute of Telecommunications composed of several computers, VoIP pohones, switches and routers. Functinonal network is then tested to failure of individual nodes and the impact on network traffic. In another part of this bachelor thesis this network is tested using different QoS support options.
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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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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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5G Cellular Networks
Schaller, Lukáš ; Novotný, Vít (referee) ; Krkoš, Radko (advisor)
The subject of the bachelor’s thesis is mobile communication network of 5𝑡ℎ generation with focus on improvements from current 4𝑡ℎ generation. At the beginning of my work I summarized the system of 4𝑡ℎ generation mobile network EPS including description of individual parts. Next section pays attention to 5𝑡ℎ generation mobile communication network in context of network demands and future development, radio interface, network architecture or Internet of Things. Next follows solution of D2D communication especially LTE Direct and Wi-Fi Direct technologies. Here I paid attention to data agregation used in conjunction with Internet of Things enabling usage of IEEE 802.11 or IEEE 802.15.x standards. In closing part I described heterogeneous radio network and in particular mutual integration of cellular and Wi-Fi networks. In the first practical part of my bachelor’s thesis I measured parameters of Wi-Fi network during client-server communication. In the second practical part I tested data agregation of two devices using experimental network at Institute of communication.
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Desing of a Company Network Infrastructure
Přikryl, Adam ; Novotný, Vít (referee) ; Ondrák, Viktor (advisor)
The bachelor's thesis deals with the design of a computer network for a manufacturing company. The first part is devoted to the analysis of the current state of the company, its facility, needs, current network and the investor's requirements for a new network. The second part summarizes the theoretical background needed to understand the issues of computer network design. The actual design itself is covered in the third part. It is based on an analysis of the current state and includes the selection of passive layer elements, design of cable routes, recommendations for active elements and economic evaluation.
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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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Design of communication network infrastructure for office building with open-spaces
Dvorštiak, Dávid ; Ondrák, Viktor (referee) ; Novotný, Vít (advisor)
The bachelor's thesis deals with the elaboration of a comprehensive design of the communication network infrastructure for office building with open-spaces. The work begins with theoretical background, which clarifies the issue of communication network infrastructure and are also fundamental for its proper development. Subsequently, the work analyses the current state of the premises, including the requirements from the investor and the floor plan provided. The final part of the work is devoted to a comprehensive design for the construction of communication network infrastructure in the premises.
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Methods for measurement of data network performance and quality parameters
Sukup, Luboš ; Zeman, Václav (referee) ; Novotný, Vít (advisor)
Master thesis involves the development of quality measurement issues and performance parameters in data networks. It describes the main technologies as they affect the quality and performance parameters and the effect of these parameters for voice, video and data services. Next are listed some methods for measuring parameters of the data network.In the practical part is selected one method of measuring network parameters and properties of this method are demonstrated by illustrative examples.
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Data acquisition from a great number of computers using hierarchical summarization
Jelínek, Mojmír ; Novotný, Vít (referee) ; Komosný, Dan (advisor)
This paper deals with IPTV (Internet Protocol Television) transmission of feedback and is showing options and ways of construction, problems and optimalization of signalization protocol. In the beginning are described IPTV and technology terms that this technology uses. Here can be found information about classical TV (Television) transmitting and comparing with IPTV technology, the advantages and disadvantaged of IPTV and answers why this solution has future. Next parts are about history of IPTV and real use over ADSL (Asymmetric Digital Subscriber Line) in present. Here are explained all the necessary units like Head-End, feedback target, root feedback target, ADSL, DSLAM (Digital Subscriber Line Access Multiplexer) and methods of data stream transmission. Also here are described the techniques of video stream compression (MPEG-2 and MPEG-4) and all options of data transmission as broadcast, unicast and multicast. Important part is about transmission speed and needs. The realization also contains applications, written in the C++ language, for transmitting and receiving packets by UDP (User Datagram Protocol) protocol. The task of these applications is to load the main server, where the measurement of packet loss and CPU (Central Processing Unit) load takes place. The result is a table of measured values for specified packet sizes and for specified time intervals between them. The meaning of this measuring is to find the maximal number of computer nodes, which the feedback target is able to proceed. Last part is about realization of 2 applications in JAVA language, which get the information about end-nodes. Both algorithms are using 2 threads to increase speed of getting the information. The client has few random generators within one thread, which will be later replaced by special algorithms for getting real values.
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