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Creating real-time IMS application
Novotný, Filip ; Mácha, Tomáš (referee) ; Nagy, Ľuboš (advisor)
This paper presents a description of the IP Multimedia Subsystem (IMS) architecture and IMS services. IMS is a standardized next-generation networking architectural framework providing advanced services on mobile and fixed networks. The first chapter describes four-layer IMS architecture and also mentions supported services. The second chapter deals with IMS protocols and primarily focuses on the SIP signaling protocol. UDP, RTP and TLS protocols are also included in this chapter. The third chapter is dedicated to practical part of this paper. A VoIP Java application has been created based on the findings gained throughout the thesis. The main part of the created application consists of client-side application, database MySQL and Servlet application for communication between database and client-side application. The whole system was created using SDS Sony Ericsson 4.1. FD1. An OpenIC lite client has been tested during development on our system and results were compared with created client-side application. A web application based on PHP, MySQL and ActionScript then handles administration and monitoring of customers using voice services.
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IMS multimedia services
Dohnálek, Václav ; Martinásek, Zdeněk (referee) ; Mácha, Tomáš (advisor)
This master thesis refers to a new technology in a mobil services IP multimedia subsystem. First, the theoreticl part, refers to the architectury of this technology and elementary protocols. Although it is real-time services, is nesessary to refer about the Quality of Services, that it ensures the condent transmition of data. The second, practisy part refers to a the development background SDS 4.0 FD1 from Ericsson ltd., that it is used develop aplications for IMS technology. It will be to develop the aplication , that it used to the IMS and it refers to the elementary function and comunication.
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Application of MATLAB Coder for automatic generation of C code for dsPIC microcontrollers
Mácha, Tomáš ; Křivánek, Václav (referee) ; Grepl, Robert (advisor)
Generating C code from MATLAB can be a powerful tool for a wide range of engineering problems. Especially in cases where MATLAB excels, including matrix operations and some of the built-in functions, code conversion may represent a significant assistance in their development. The aim of this master's thesis is to explore the possibilities of generating C code using MATLAB Coder App. As the documentation for MATLAB Coder was not found sufficient a theoretical basis for the use of this tool was introduced along with simple examples of possible applications. Next, code generation for controlling a laboratory DC motor using a microcontroller dsPIC was made automatic and controlled directly from a single MATLAB script. Individual steps were described to supplement existing documentation and to allow for an easy use. Finally, selected functions were tested for code generation. As a result, certain limitations can be outlined, as well as suitability of both the created tool and the MATLAB Coder App.
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Power side channel
Zapletal, Ondřej ; Mácha, Tomáš (referee) ; Martinásek, Zdeněk (advisor)
This thesis deals with side-channel cryptoanalysis. It is focused on power side-channel attack on cryptographic device. The microcontroller PIC is used as the cryptographic device. This microcontroller performs encryption through the symmetrical algorithm AES. For the purpose of simple and differential power analysis, we designed and constructed an experimental printed circuit board. The power consumption of the microcontroller PIC working with instruction AddRoundKey and SubBytes was scanned by a Tektronix CT-6 current probe. Data obtained by measuring were processed on the computer with relevant software and provided important information about the encryption key that was used.
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IMS based multimedia services
Novotný, Roman ; Nagy, Ľuboš (referee) ; Mácha, Tomáš (advisor)
Submitted work describes IMS (IP Multimedia Subsystem) and focuses on services offered by this technology. In the theoretical part of the thesis is a detailed description of the IMS architecture, in the terms of its components and interfaces. Also a SIP protocol is described as the main signalling protocol, which represents the basis of the IMS architecture and RTP protocol that allows the transmission of multimedia data in real-time. Further, there are provided services that the IMS system brings. The practical part of the work describes the design and implementation of services within the IMS. It is a client-server service. Server part of the system is implemented as a SIP Servlet application. It has access to the MySQL database, which stores records of multimedia files. Client registered in the IMS network can communicate with the SIP servlet sending a request for information on such files. Following this communication, the client can play the file in his online ICP application, or download it into his PC and then play. To play and view multimedia fines is used JMF. The service is implemented in a development environment SDS Ericsson 4.1, which allows simulation of the IMS network.
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Mobile phohe programming
Ochodnický, Ján ; Růčka, Lukáš (referee) ; Mácha, Tomáš (advisor)
This bachelor thesis is focused on mobile phone programming. The paper theoretically analyzes most expanded operating systems and Symbian operating system programming languages. Also theoretically describes the GSM technology, communication between mobile station and base station and transferred parameters of connection. Bachelor thesis includes two programs for Symbian operating system. Program FDSearch is created in Python for S60 programming language. This application serves to search directories and files in the mobile phone. The second program About Net is created in Symbian C++ programming language and is intent on capturing system information from network.
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IP Multimedia Subsystem technology signalling
Čech, Martin ; Stančík, Peter (referee) ; Mácha, Tomáš (advisor)
Aim of this Bachelor´s thesis is to describe singnalization during communication through IP Multimedia Subsystem technology. The first part focuses on describing the technology itself, entities of its architecture and used protocols. Next part deals with creation of a network which will be used for examining signalization during call sessions. This network is created in Ericsson´s Service Development Studio environment. The last part discusses development and testing of client application for instant messaging.
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Application for secure data storage for mobile devices
Kocáb, Marek ; Martinásek, Zdeněk (referee) ; Mácha, Tomáš (advisor)
This bachelor’s thesis is focused on the creation of application for secure data storage for mobile devices. The paper theoretically describes operating system according to users popularity and programming languages. The following section explains AES encryption standard and its principle of data encryption and decryption. In the practical part is created a PINapplication programm. The application allows user to store sensitive data using chosen password. It is possible to save new data or erase current data. These data are encrypted by mentioned AES standard. The application is programmed in Java language with the version for mobile devices (J2ME).
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Multimedia services in wireless networks
Bučina, Peter ; Martinásek, Zdeněk (referee) ; Mácha, Tomáš (advisor)
The main topic of my diploma thesis is dedicated to the issue of wireless networks mostly aimed at IEEE 802.11 standard. Theoretical part of the thesis is divided into three main chapters. It deals with basic overview of standards, architecture, utilization of radio spectrum and modulating techniques in signal processing. Further, it describes basic security measures and quality of service requirements in WLAN networks. The thesis is complemented by two separate laboratory assignments focused on procedure related to the chosen problematic. The first assignment handles common steps to break ciphered protocols WEP and WPA in WLAN’s. Linux software called Back Track 5 was used to provide complete package of tools for WLAN security tests. The second one is aimed at practical options on video streaming in converged wireless networks and also at remote access of mobile users to wireless IP camera video stream.
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Fault recovery in data networks
Trávníček, Michal ; Martinásek, Zdeněk (referee) ; Mácha, Tomáš (advisor)
The purpose of the bachelor’s thesis was to explain the basic principles and technologies for ensuring reliable and effective routing within networks when a link failure. This is with minimal effect to the quality of service. The focus was on mechanisms ensuring the quality of services within the network, especially differentiated services and the both groups of dynamic routing protocols – distance vectors and link state protocols. On the basis of obtained knowledge, the simulation has been designed in OPNET Modeler. It simulated routing of routing protocols RIP and OSPF of networks without any failure. The next simulations containted the link failure and the link recovery. Then the network with DiffServ was designed. It filtered data packets according to used ports and protocol and it added a label to packet with a priority for the certain service. The attention in the network was focused on the VoIP service and its parameters, such as jitter and end-to-end delay. It has also monitored the value of dropped traffic. It simulated the networks with the link failure and the link recovery. The results were compared to the network with no QoS and network with QoS but no failure.
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