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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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Optimization of hand-over process in real network environment
Hornyak, Tomáš ; Skořepa, Michal (referee) ; Molnár, Karol (advisor)
This Master´s thesis deals especially with exploration of the handover process and with searching for ways of in?uencing this process. The goal of this thesis is to create tools for recording of access point utilization and in?uence the handover of wireless clients based on the obtained data. An access point with open ?rmware, which allows low-level management, was necessary for practical tests. First chapter deals with a survey of current o?er of open ?rmware available for access points and then the appropriate candidate for this thesis is chosen – the OpenWRT project. Second chapter deals with the con?guration of OpenWRT system and basic settings of the chosen wireless router – TP-Link TL-WR1043ND. Next chapter deals with analysis of the handover process in wireless networks. Information obtained by this analysis is used during the creation of the graphic application. The fourth chapter presents the basics of Microsoft Native Wi-Fi API and introduces basic functions used by this API. Those functions were used during the creations of the application. Last two chapters present the created graphic application. The ?fth chapter deals with the application design and examination of its functionality and used functions. Last chapter then documents usability of the application in real environment.
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Analysis of wireless network traffic
Guznar, Martin ; Kubánková, Anna (referee) ; Novotný, Bohumil (advisor)
This work solves the VoIP call switching system android with standard Long Term Evolution (LTE) on the IEEE 802.11 standard without losing the connection. In the theoretical part they are described in detail the various standards, protocols, their description and their interconnection. The proposed test will be in the system android with ongoing VoIP call. The outcome should be a capital loss graph Wi-Fi signal and follow your phone’s connection to LTE through a local provider, and all this without losing the connection and interruption of that ongoing VoIP call. The results of this study make it possible to determine how and under what circumstances will switch network from Wi-Fi to LTE and how it happened. Furthermore also obtain data that take place between a precise description of the procedure soft handoff.
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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
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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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Analysis of control traffic in mobile networks
Šubrt, Jan ; Krkoš, Radko (referee) ; Novotný, Vít (advisor)
The Bachelor´s thesis describe management procedures in mobile systems. This thesis is mainly focused on mobile systems GSM and LTE. Further are describe basic processes what are required before starting service. This basic procedures contains: inspection of radio signals, select the cell with the best parameters for connection, allocate channel to mobile station, authentication of subscriber and location update. Next part of thesis describe procedures in handover, initialize call session and data session. Last chapter describes laboratory task for subject Communication resources in mobile networks.
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UMTS radio access network optimization in Opnet Modeler environment
Toman, Petr ; Herman, Ivo (referee) ; Novotný, Vít (advisor)
The differences between networks of mobile operators can be in their achitecture or the optimization of each network. The architecture is standardized which means there will only be differences in the willingness of mobile operators to invest in newer network elements. Network optimization is more important. The way of optimization isn't strictly given and depends on how the operator deals with it. The most important attribute in optimization is balance. The operators try to achieve balance among three important parameters. Those are capacity, coverage and maintaining QoS. Optimization depends on RRM algorithms. The algorithms include various functions such as admission control, congestion control, handover control, power control, etc. These elements don’t only affect the optimization but also affect each other, because they cooperate with each other. For example, an incorrect admission control of the network leads either to frequent network congestion because of a large number of participants in the network (participants are dissatisfied with the services offered by the operator) or to low utilization of the network because of too few participants in the network (the operator is dissatisfied because he is losing the possible earnings). Neither of these posibilities is good for the mobile operator, therefore it is important that the admission control is well balanced.
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Mobile IPv6 handover analysis
Klügl, Richard ; Hošek, Jiří (referee) ; Skořepa, Michal (advisor)
This master’s thesis is focused on IP mobility support for mobile users and their devices in IPv6-based wireless networks. Then the Mobile IPv6 (MIPv6) protocol was proposed for this purpose and that is also the main objective of the thesis. This consists of several basic sections and is organized as follows: The first one deals with the overview of the function of Mobile IP, which enables the mobility of nodes around the Internet, without a change of their original IP address. Moreover there are introduced the primary differences between MIPv6 and its previous version – i.e., MIPv4, proposed for IPv4-based environment. The second chapter of the master’s thesis thereafter describes detailed information about all the most important mechanisms and features of Mobile IPv6 and this way tries to explain principles of its functioning. Further the thesis analyses some of proposed MIPv6 extensions – i.e., Hierarchical Mobile IPv6 (HMIPv6), Mobile IPv6 Fast Handover (FMIPv6) a Fast Handover for HMIPv6 (F-HMIPv6) protocols, and mainly aim at signaling process during the handover of a mobile node. In the last main section of the master’s thesis an analytical method to evaluate the performance of IPv6-based mobility management protocols was proposed. Subsequently, this method is applied on the protocols which were mentioned above and are studied the effects of various network parameters on the performance of these protocols.
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Simulation of data networks in OMNeT++
Závodný, Ondřej ; Novotný, Vít (referee) ; Skořepa, Michal (advisor)
The content of this work is to research possibilities of simulation data networks in a simulating environment OMNeT++ with INET framework and at observance of standards 802.3 (ethernet) and 802.11 (Wi-Fi).\ In a given environment will be simulated handover in a Wi-Fi network and on the second layer of the reference model ISO/OSI. In this example will be processed visualization of the conditions and sending informations between network elements.\ In the next practical example will be simulated the operation on the application layer (video current, ftp communication) at using a relevant transport protocols (UDP,TCP). For routing between network elements will be utilized configuration files. By transport protocol UDP will be displayed a delay graph between final elements and jitter, by TCP protocol will be represented so-called three-way-handshake.
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New Mobility Trends in Data Networks
Skořepa, Michal ; Róka, Rastislav (referee) ; Bešťák, Robert (referee) ; Koton, Jaroslav (advisor)
Dizertační práce se zabývá návrhem nového algoritmu řízení handoveru v rámci protokolu Mobile IPv6, který umožní nasazení tohoto protokolu v leteckých datových sítích. Existující algoritmy řízení handoveru sice dosahují dostatečné výkonnosti v konvenčních pozemních bezdrátových sítích disponujích velkou šířkou pásma a nízkou latencí, jako jsou WiFi nebo UMTS, ale jak ukazuje tato práce, nasazení těchto algoritmů prostředí leteckých datových sítí nepřináší očekávané výhody. Analýza ukazuje, že v úzkopásmových leteckých sítích trpí tyto algoritmy řízení handoveru velkou latencí a způsobují značnou režii. Nový algoritmus řízení handoveru v MIPv6 navržený v této práci je založený na jednoduché myšlence: ''Já jsem letadlo, já vím, kam letím!'' To znamená, že pohyb letadla není náhodný, ale vysoce předvídatelný. Díky tomu je možno předvídat handovery mezi přístupovými sítěmi podél očekávané trajektorie letadla a vykonat nezbytné operace pro přípravu handoverů již na zemi, kde je letadlo připojeno k širokopásmové síti letiště. Tato dizertační práce dále uvádí porovnání existujících algoritmů řízení handoveru s nově navrženým pomocí analytické metody ohodnocení handoveru. Díky tomu je možno kvantifikovat výhody, které nový algoritmus přináší a taktéž popsat slabiny algoritmů existujících.
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