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Radio Access Network of a Cellular Network
Duda, Michal ; Novotný, Vít (referee) ; Krkoš, Radko (advisor)
The aim of the work is the radio access network of mobile networks second, third and fourth generation. The main objective is a description of the radio access network of the second, third and fourth generation, their elements, interfaces and signaling procedures. The next part describes the emergency services and the architecture of the fourth generation mobile networks. The practical part is then devoted to identify actions needed to prepare radio access network to testing emergency services, identify actions needed to conversion of transport protocol fixed part of the radio access network from IPv4 to IPv6 and describe the intervention to radio access network to change the active segment of the core network.
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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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Kamailio and OpenSIPs open source PBX
Janeček, Václav ; Krkoš, Radko (referee) ; Šilhavý, Pavel (advisor)
Open source PBX Kamailio and OpenSIPS diploma thesis covers familiarization with appointed SIP exchanges and with their power comparing. A detailed installation instructions on the operating system Ubuntu is the aim of this work too. The work includes the historical development of telephone exchanges with a focus on the latest generation. The following is SIP protocol basic description and components that can be composed SIP exchanges. Another part is devoted to the development of exchanges Kamailio and OpenSIPS. The thesis contain the archutecture and configuration file description. The practical part of the thesis deals with high-capacity switches, and comparing it in terms of memory and computational demands. Selected measurements are compared with the Asterisk PBX.
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Control plane analysis in 4G mobile networks
Nguyen, Filip ; Krkoš, Radko (referee) ; Novotný, Vít (advisor)
The aim of this paper is to introduce the LTE system, especially with the EPC system. Protocol analysis equipment of the system and the description of the signal at the fundamental procedures such as logging into the system, change the viewing area, handover, paging, etc. and were designed idikátory of system performance EPC.
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Software for seeking vulnerable computers in network
Krkoš, Radko ; Pelka, Tomáš (referee) ; Polívka, Michal (advisor)
This thesis concerns about computer system and network infrastructure security. It describes the topic of security holes and vulnerabilities and discusses possibilities for computer attack defense. Common security holes and client and server systems configuration errors are described. There are stated simple rules and advices for configuring network environment according to security and minimalization of failure or violation risk due to security holes and vulnerabilities. Thesis adresses approaches of security hole detection in programs and devices entrusted to administrator, device and security holes inventory control and prevention possibilities. Thesis describes how to execute self security audit and how to process its results. It suggests techniques and methods to administer network, server, or intranet during its lifespan according to security. It also analyses existing available software and evaluates its features and resources with regard to security topic. Software is chosen to simplify work for administrator in some or more parts of security management like network condition analysis, error and vulnerability detection in computer systems, network infrastructure, web applications or applications for network alternation detection. Thesis recommends requirements for security audit application and discusses eligible features in regard of functionality and added value. Created set of scripts simplifies administrator's work by automating common and time consuming tasks and delivers information in compact and simple form, what makes the work more comfortable and shortens the reaction time to crises such as discovery of new security hole or security breach.
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Implementation of triple-play in heterogeneous network
Obršlík, Lukáš ; Šedý, Jakub (referee) ; Krkoš, Radko (advisor)
This master thesis deals with implementing triple-play services and providing it’s quality of services in heterogenous comunnication networks. The aim of thesis is to apply the- oretical methods in real case and existing network infrastructure. Practical part aims to create technical solution to prioritize network traffic based on classification of required services. The technical solution is created with conditions of being possible to add more functions and to provide scalability.
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Mobile Network Diagnostics
Krkoš, Radko ; Baroňák, Ivan (referee) ; Uchytil, Stanislav (referee) ; Novotný, Vít (advisor)
The thesis deals with the topic of mobile network diagnostics, different methods applicable for this purpose and methodology for technical diagnostics and consequent error mitigation or mobile network optimisation. Service commonly offered by mobile networks and their quality of service requirements and analysis methods are described.
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Creation of network drivers for the Windows family of operating systems
Krkoš, Radko ; Hošek, Jiří (referee) ; Růčka, Lukáš (advisor)
This thesis describes the approach in designing and implementing a driver marking network traffic for quality of service provision. In the beginning distinct technologies usable for the driver development are discussed and compared to each other while the most suiting candidate is chosen for driver development. Next the thesis discusses the design of the driver according to specification and depicts a list of more specific requirements affecting the driver design itself. The focus point in design is the least possible impact on network traffic performance and the running system itself. In addition to the driver an application programming interface usable from user mode is designed and so the system as a whole ensures the marking of network traffic entirely. In the end the created driver architecture is described and the application programming interface is described in terms of use.
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Virtualisation as a data network simulation apparatus
Chapčák, David ; Burda, Karel (referee) ; Krkoš, Radko (advisor)
This bachelor’s thesis deals with the use of virtualization, especially for data network simulation. The theoretical part deals with virtualization including virtualization division into groups and evaluate the advantages and disadvantages of virtualization. The following part describes several common virtualization tools. The majority of the text is devoted to simulation and presents several network simulators, which use virtualization. In the next part several experimental networks that are currently operating are described. Furthermore the measurement portion is realized where the measured parametres gathered from virtual network are compared with data measured in real network. The final section summarizes the results and draws conclusions.
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Design of reliable VLAN-based enterprise data nework
Vrablic, Pavol ; Krkoš, Radko (referee) ; Novotný, Vít (advisor)
The main aim of this work is to identify the potential issues within a robust network to provide a highly reliable and fault free service – with a smooth and reliable functionality of critical services. This work contains new methods of branch networking and virtualization that is increasingly used in enterprise networks. It is important to note that computer clustering provides the functionality of critical services that can surpass potential partial failures and network QoS; which overall, achieves a high quality and reliable service.
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