|
|
Wireless sensor network
Hruška, Martin ; Burda, Karel (referee) ; Mišurec, Jiří (advisor)
Wireless sensor network (WSN) consist of a mesh of a several powerful devices (denoted as base stations or sink) and a high number (1000 - 1000000) of a low-cost devices (denoted as nodes or motes), which are severely constrained in processing power, memory and energy. The nodes are equipped with an environment sensor. Events recorded by the sensor nodes are locally aggregated and then forwarded to a base station for further processing. WSNs are expected to be in wide use for a multitude of different scenarios. Project target is to analyse possibility of wireless transfer of digitalised data from sensors. Work contains and compares: Wi-Fi, , WiMAX, ZigBee, GPRS, radio net and IrDA. The work will design a wirelless network with data collection from sewerage plant sensors in small rural agglomeration and transfer data to the central dispatching. The work will suggest several options and compare their advantages and disadvantages.
|
|
|
Data network for smart grid energy
Durkoš, Michal ; Šimek, Milan (referee) ; Mišurec, Jiří (advisor)
Electric grid as we now it has been without significant change for a long time. Along with the human population grows demand for electricity, which leads to need to create more energy. Bigger interest is in ecology and use of renewable sources, although these do not have constant output which often stresses the grid. These problems are to be solved by smart grids. Smart grids are capable of adjusting energy generation to immediate demand including renewable sources to compensate energy fluctuations in grid. They provide demand response and other applications interesting for end users. Smart grids are combination of achievements in energy, informatics and communication technology. Communication, which is key part of smart grids, has to met certain requirements and can be executed by various technologies. There are described various communication technologies and a design concept of data communication in this paper.
|
|
|
Providing IP mobility in Wi-Fi and Wi-Max environment
Klügl, Richard ; Novotný, Vít (referee) ; Skořepa, Michal (advisor)
The bachelor´s thesis is focused on wireless networks within the context of providing support of IP mobility for these networks. This document consists of two main parts, the theoretical part and the practical part. The first one at the beginning includes simple characteristics and classification of wireless networks. Then it is followed by description of actual new trends in wireless networks, focused on the WiMAX technology (IEEE 802.16). At the end of this part is introduced the technology of mobile IPv4 address provided by the MIPv4 protocol. The second main part of the bachelor´s thesis deals with the practical implementation of the MIPv4 protocol into the Wi-Fi and WiMAX environment. For this object is used the OPNET Modeler 14.0 simulation environment, in which are made three network models of these technologies. This simulation shows function of the basic mechanisms of the MIPv4 protocol and reports which of these models have the best performance for supporting VoIP communication.
|
|
|
Quality and accessability measurement of GSM network
Vondra, Marek ; Wieser,, Vladimír (referee) ; Hanus, Stanislav (advisor)
The thesis is specialized on a possibility of measuring qualities and availability of a cellular radio system and also on evaluation qualities, fruitfulness interface, permeability etc. It includes short description of a basic mobile technology. Further analysis of the possibility of measuring the mobile network and how implement the measure. It also includes a draft program for measuring and evaluation of the GSM network with help several tests by a mobile phone connected through the Bluetooth.
|
|
|
Increasing the efficiency of the handover in real network environment
Michalec, Richard ; Sobotka, Jiří (referee) ; Vajsar, Pavel (advisor)
The aim of this work is to study methods of handover used in WiMAX and WLAN networks, next suggest the posibility of simulation methods for WLAN handover in the simulation environment OPNET Modeler. This work is focused primarily on obtaining the information about neighboring AP and subsequent selection of a new AP using such information. The work describes in detail each processes solutions that are used to implement newscanning methods
|
|
|
Femto cells in next generation mobile networks
Bernkopf, Jan ; Štencel, Vít (referee) ; Hanus, Stanislav (advisor)
This paper provides theoretical analysis of LTE network and Femto cells. Its presents their modulation and transition techniques, their performance and of course implementation of Femto cells into LTE macro-layer. It also describes potential risk of interference between LTE macro-layer and Femto cells and provides the way how to solve and simulate interference. Finally it states simulation and analysis of model situations.
|
|
|
Mobile internet principles
Jehličková, Lenka ; Fencl, Josef (referee) ; Hanus, Stanislav (advisor)
Thesis concerns with mobile communications theory with focus on data transfer. In the introduction the history, the origin and individual mobile systems generations are described. It is followed by detailed description of second, third and fourth generation mobile systems. Frequency band allocation, signal processing, the system architecture itself, security management and basic features are also discussed. The GSM system is described together with individual data transmission types based on circuit switching – CSD and HSCSD and packet switching – GPRS and EDGE. For UMTS, FDD and TDD modes are listed as well as changes in individual releases, corresponding technologies and provided services. Next, there is the description of LTE and WiMAX systems, together with their improvements whose are part of the fourth generation of mobile systems. Last of the described systems is the still work in progress HAPS, also known as the system of stratospheric platforms. In the end important parameters are summarized and systems are compared with each other.
|
|
|
Design of Communication system among Moving Vehicles
Klampár, Marián ; Polívka, Michal (referee) ; Škorpil, Vladislav (advisor)
The purpose of this thesis is to show up possibilities of inter-vehicle communication and to introduce new approaches in communication for the purpose of enhancing the security and the fluency of vehicle transportation. This thesis also highlights vulnerabilities in communication. The main goal is the analysis of existing technology and the design of protocol for data transfer with focus on minimizing handover time of informations. Part of the design is a simulation of communication based on acquired information.
|
|
|
Support of real-time services in recent 3G mobile networks
Vinkler, Lukáš ; Mácha, Tomáš (referee) ; Novotný, Vít (advisor)
This Master’s thesis is focused on the recent 3G mobile networks. The first chapter describes an evolution of standardization 3G and surveys a gradual development of 3G networks in Czech Republic from a point of view of commercially launched technologies and assigned frequency spectrums for single mobile operators. UMTS and CDMA 2000 are briefly approached in next subchapters. The subchapter CDMA 2000 is briefly concentrated on architecture and a physical layer of this technology and characterizes main features of four revises of developmental branch CDMA 2000 1x EV-DO. The subchapter UMTS is especially focused on a comparison of air interfaces TD-CDMA and W-CDMA. New features were implemented to the recent system UMTS for a better support of real-time services. These features increasing a throughput and decreasing a delay are described in a chapter Technology HSPA. This chapter chooses the most important features and describes changes (in a control and architecture) which had to be implemented. First chapter is finished by technology WiMAX. The most recent perspective cell systems are compared with WiMAX in this subchapter and qualitative parameters of WiMAX are shown there. The three different 3G technologies (UMTS-FDD, UMTS-TDD and CDMA 2000) are lunched in Czech Republic. The second chapter briefly compares coverage of three czech mobile operators (Telefónica O2, T-Mobile and U:fon) and then presents results of qualitative parameters of used 3G technologies. The simulation conducted by software IxChariot were focused on to gauge parameters like throughput, delay, jitter, lost data, MLR and DF. The conditions for providing real-time services were specified based on simulations that were practically checked. The lab composed in last chapter should bring closer to students technology UMTS-TDD launched by T-Mobile. The students will measure the qualitative parameters of this technology with the assistance of commonly available tools.
|
|
|
Integrated telecommunication environment
Tomeček, Jan ; Škorpil, Vladislav (referee) ; Polívka, Michal (advisor)
The thesis described the proposal for a wireless network problems. There are recorded and compared the characteristics of different wireless technologies. The possibility of voice communication securing is outlined and solutions implemented in the form of ZRTP protocol. The requirements for quality of service are discussed and the solutions to this issue are proposed. Other chapters are devoted to the actual design of specific equipment, including antennas and advance resource. The whole network is practically implemented in the mountainous countryside of eastern Wallachia. In conclusion, this work is network mate in terms of QoS (quality of service) and tested in terms of prioritization of voice communication.
|
guest ::
