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Dynamic Metric in OSPF Networks
Mácha, Tomáš ; Orgoň, Miloš (referee) ; Bešťák, Robert (referee) ; Novotný, Vít (advisor)
Masivní vývoj Internetu vedl ke zvýšeným požadavkům na spolehlivou síťovou infrastrukturu. Efektivita komunikace v síti závisí na schopnosti směrovačů určit nejlepší cestu pro odesílání a přeposílání paketů ke koncovému zařízení. Jelikož OSPF v současné době představuje jeden z nejpoužívanějších směrovacích protokolů, jakýkoli přínos, který by pomohl udržet krok s rychle se měnícím prostředí Internetu, je velmi vítán. Významným omezením OSPF protokolu je, mimo jiné, absence informovanosti algoritmu pro výpočet metriky o aktuálním vytížení linky. Tato vlastnost představuje tzv. slabé místo, což má negativní vliv na výkonnost sítě. Z tohoto důvodu byla navržena nová metoda založená na dynamické adaptaci měnících se síťových podmínek a alternativní strategii OSPF metrik. Navržená metoda řeší problém neinformovanosti OSPF metriky o síťovém provozu a nevhodně vytížených linek, které snižují výkonnost sítě. Práce rovněž přináší praktickou realizaci, kdy vlastnosti nové metody jsou testovány a ověřeny spuštěním testů algoritmu v reálných zařízeních.
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Optimization of Signalling Traffic in IMS Subsystem of NGN Networks
Nagy, Ľuboš ; Orgoň, Miloš (referee) ; Bezpalec, Pavel (referee) ; Novotný, Vít (advisor)
One of causes of increased latency service over the whole IMS network can be unbalanced SIP (Session Initiation Protocol) signalling traffic through CSCF (Call Session Control Function). This thesis is devoted to the proposal of weight-based load balancing algorithm which can be used for the S-CSCF assignment performed by I-CSCF during the initial registration procedure of subscribers over the IMS architecture. The designed mechanism is implemented and evaluated in the mathematical model of IMS subsystem based on single servers with FIFO queues with the unlimited capacity in the numerical computing environment - Matlab. Two test-cases with different performance conditions of available S-CSCFs are described. The influence of measured latency affected by performance of other nodes (e.g. P-CSCF, I-CSCF, HSS, etc.) is minimized. Each of simulated test-cases is measured with various service times of SCSCFs and inter-arrival times. The obtained results of designed algorithm are compared with well-known selection algorithm – the round-robin algorithm. It is shown that new selection mechanism improved the service latency of whole IMS network. The possible weakness of the designed weight-based algorithm is sensitivity to traffic model over the modelled IMS architecture.
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Analysis and Optimization of Data Communication for Telemetric Systems in Energy
Fujdiak, Radek ; Orgoň, Miloš (referee) ; Pitner,, Tomáš (referee) ; Mišurec, Jiří (advisor)
Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation.
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Analysis and modeling of Power Line Communication
Mlýnek, Petr ; Orgoň, Miloš (referee) ; Pospíchal, Ladislav (referee) ; Mišurec, Jiří (advisor)
The dissertation thesis focuses on the analysis and modelling of power line communication. In first part of the thesis, a basic information of power line communication are described, primarily principle, advantage and disadvantage. The physical layer of the transmission and the fundament of modelling are described later. In the following section the objectives of the dissertation thesis are specified. Experimental verification of the created models and creating of indoor and outdoor models are one of the major goals of this work. These models approximate the real parameters of the power lines communication with sufficient precision. A detailed analysis of existing and current research in power line communication modeling, especially for the power line models, then follows. Based on this analysis a mathematical description of the models is specified and reference model for different scenarios is designed. The communication channel model, power line model and noise model are designed in own solution part. In this part the main goals, experimental verification of created models and designed of models for indoor and outdoor line were also realized. By merging of individual models, PLC communication system model with all parameters analyzed in detail arise. The analyzed parameters which were previously published, do not contain these parameters coherently. The last part of the thesis gives a summary of the results of these analyzes and discussion of simulation results.
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Analysis and Optimization of Data Communication for Telemetric Systems in Energy
Fujdiak, Radek ; Orgoň, Miloš (referee) ; Pitner,, Tomáš (referee) ; Mišurec, Jiří (advisor)
Telemetry system, Optimisation, Sensoric networks, Smart Grid, Internet of Things, Sensors, Information security, Cryptography, Cryptography algorithms, Cryptosystem, Confidentiality, Integrity, Authentication, Data freshness, Non-Repudiation.
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Optimization of Signalling Traffic in IMS Subsystem of NGN Networks
Nagy, Ľuboš ; Orgoň, Miloš (referee) ; Bezpalec, Pavel (referee) ; Novotný, Vít (advisor)
One of causes of increased latency service over the whole IMS network can be unbalanced SIP (Session Initiation Protocol) signalling traffic through CSCF (Call Session Control Function). This thesis is devoted to the proposal of weight-based load balancing algorithm which can be used for the S-CSCF assignment performed by I-CSCF during the initial registration procedure of subscribers over the IMS architecture. The designed mechanism is implemented and evaluated in the mathematical model of IMS subsystem based on single servers with FIFO queues with the unlimited capacity in the numerical computing environment - Matlab. Two test-cases with different performance conditions of available S-CSCFs are described. The influence of measured latency affected by performance of other nodes (e.g. P-CSCF, I-CSCF, HSS, etc.) is minimized. Each of simulated test-cases is measured with various service times of SCSCFs and inter-arrival times. The obtained results of designed algorithm are compared with well-known selection algorithm – the round-robin algorithm. It is shown that new selection mechanism improved the service latency of whole IMS network. The possible weakness of the designed weight-based algorithm is sensitivity to traffic model over the modelled IMS architecture.
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Dynamic Metric in OSPF Networks
Mácha, Tomáš ; Orgoň, Miloš (referee) ; Bešťák, Robert (referee) ; Novotný, Vít (advisor)
Masivní vývoj Internetu vedl ke zvýšeným požadavkům na spolehlivou síťovou infrastrukturu. Efektivita komunikace v síti závisí na schopnosti směrovačů určit nejlepší cestu pro odesílání a přeposílání paketů ke koncovému zařízení. Jelikož OSPF v současné době představuje jeden z nejpoužívanějších směrovacích protokolů, jakýkoli přínos, který by pomohl udržet krok s rychle se měnícím prostředí Internetu, je velmi vítán. Významným omezením OSPF protokolu je, mimo jiné, absence informovanosti algoritmu pro výpočet metriky o aktuálním vytížení linky. Tato vlastnost představuje tzv. slabé místo, což má negativní vliv na výkonnost sítě. Z tohoto důvodu byla navržena nová metoda založená na dynamické adaptaci měnících se síťových podmínek a alternativní strategii OSPF metrik. Navržená metoda řeší problém neinformovanosti OSPF metriky o síťovém provozu a nevhodně vytížených linek, které snižují výkonnost sítě. Práce rovněž přináší praktickou realizaci, kdy vlastnosti nové metody jsou testovány a ověřeny spuštěním testů algoritmu v reálných zařízeních.
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Analysis and modeling of Power Line Communication
Mlýnek, Petr ; Orgoň, Miloš (referee) ; Pospíchal, Ladislav (referee) ; Mišurec, Jiří (advisor)
The dissertation thesis focuses on the analysis and modelling of power line communication. In first part of the thesis, a basic information of power line communication are described, primarily principle, advantage and disadvantage. The physical layer of the transmission and the fundament of modelling are described later. In the following section the objectives of the dissertation thesis are specified. Experimental verification of the created models and creating of indoor and outdoor models are one of the major goals of this work. These models approximate the real parameters of the power lines communication with sufficient precision. A detailed analysis of existing and current research in power line communication modeling, especially for the power line models, then follows. Based on this analysis a mathematical description of the models is specified and reference model for different scenarios is designed. The communication channel model, power line model and noise model are designed in own solution part. In this part the main goals, experimental verification of created models and designed of models for indoor and outdoor line were also realized. By merging of individual models, PLC communication system model with all parameters analyzed in detail arise. The analyzed parameters which were previously published, do not contain these parameters coherently. The last part of the thesis gives a summary of the results of these analyzes and discussion of simulation results.
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