Year 2024

• Simulation Model for Application of the SDN Concept in IMS/NGN Network Transport Stratum

  Publication

  • S. Kaczmarek
  • M. Sac
  • J. Adrych

  - Year 2024

  The paper presents a simulation model allowing examination of cooperation between two currently used telecommunication networks concepts: IP Multimedia Subsystem/Next Generation Network (IMS/NGN) and Software-Defined Networking (SDN). Application of the SDN architecture elements in IMS/NGN networks will enable unified control and management of transport resources for various transport technologies and equipment manufacturers. However,...

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Year 2023

• Implementation of IMS/NGN Transport Stratum Based on the SDN Concept

  Publication

  • S. Kaczmarek
  • M. Sac
  • K. Bachorski

  - SENSORS - Year 2023

  The paper presents the development and verification of software and a testbed aiming to demonstrate the ability of two telecommunication network concepts—Next Generation Network (NGN) and Software-Defined Networking (SDN)—to cooperate. The proposed architecture includes components of the IP Multimedia Subsystem (IMS) in its service stratum and of the SDN (controller and programmable switches) in its transport stratum, providing...

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Year 2022

• Analytical Traffic Model for a Multidomain IMS/NGN Network Including Service and Transport Stratum

  Publication

  • S. Kaczmarek
  • M. Sac
  • M. Cieśliński

  - Year 2022

  This paper addresses the problem of modelling call processing performance (CPP) in a multidomain Next Generation Network (NGN) architecture including the elements of the IP Multimedia Subsystem (IMS) in service stratum and based on the Multiprotocol Label Switching (MPLS) technology in transport stratum. An analytical traffic model for such an architecture is proposed by integrating the formerly implemented submodels of service...

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• Performance Evaluation of a Multidomain IMS/NGN Network Including Service and Transport Stratum

  Publication

  • S. Kaczmarek
  • M. Sac

  - Applied Sciences-Basel - Year 2022

  The Next Generation Network (NGN) architecture was proposed for delivering various multimedia services with guaranteed quality. For this reason, the elements of the IP Multimedia Subsystem (IMS) concept (an important part of 4G/5G/6G mobile networks) are used in its service stratum. This paper presents comprehensive research on how the parameters of an IMS/NGN network and traffic sources influence mean Call Set-up Delay (E(CSD))...

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• Wydajność przetwarzania żądań usług uwarunkowanych czasowo realizowanych w sieci IMS/NGN

  Publication

  • M. Sac

  - Year 2022

  W rozprawie dokonano przeglądu stanu implementacji koncepcji IMS/NGN, a także modeli systemów obsługi z oczekiwaniem pod kątem zastosowania dla serwerów i łączy w modelu analitycznym wielodomenowej sieci IMS/NGN. Przedstawiono założenia dla tego modelu oraz metodologię obliczeń i analizy wyników: średnich czasów E(CSD) zestawiania i E(CDD) rozłączenia połączenia dla scenariuszy połączeń zakończonych sukcesem. Opisano założenia,...

• Zastosowanie koncepcji SDN w warstwie transportowej sieci IMS/NGN

  Publication

  • K. Bachorski
  • S. Kaczmarek
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2022

  Koncepcja sieci Next Generation Network, wykorzystująca w warstwie usług architekturę IP Multimedia Subsystem, zakłada centralizację funkcji sterowania zasobami sieciowymi w warstwie transportowej. Analogiczne założenie jest podstawą koncepcji Software Defined Networks. Na podstawie tej analogii, zaproponowano integrację obu koncepcji, przedstawiono architekturę zintegrowanej sieci, scenariusze sterowania zasobami oraz przygotowano...

Year 2021

• Performance Models of a Multidomain IMS/NGN Service Stratum

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2021

  This paper quantifies call processing performance (CPP) of a multidomain IMS/NGN architecture, which was proposed to deliver current and future telecommunication services with strict quality requirements, independently of the transport network technologies. A realistic simulation model is used as a reference for evaluation of the analytical results, in which vari-ous types of queuing systems are applied to model the opera-tion...

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Year 2020

• Uwierzytelnienie i autoryzacja w systemie STRADAR

  Publication

  • S. Kaczmarek
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2020

  Przedstawiono rozwiązanie serwera uwierzytelnienia i autoryzacji (AA) w rozproszonym systemie STRADAR, udostępniającym funkcjonalności dla prowadzenia działań operacyjnych Morskiego Oddziału Straży Granicznej. System umożliwia prezentację na stanowisku wizualizacji zdarzeń (SWZ) bieżącej i archiwalnej sytuacji na mapie (AIS, radary), obrazu z kamer, zdjęć, notatek, rozmów telefonicznych oraz plików i wiadomości tekstowych (SMS)...

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Year 2019

• Centralny serwer w multimedialnym systemie dyspozytorsko-teleinformatycznym STRADAR

  Publication

  • M. Blok
  • S. Kaczmarek
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2019

  Przedstawiono architekturę i najnowsze funkcje centralnego serwera (Centrum) w rozproszonym systemie monitorowania akwenów morskich opracowanym dla straży granicznej. System umożliwia prezentację bieżącej i archiwalnej sytuacji na mapie, obrazu z kamer, rozmów telefonicznych oraz plików i wiadomości tekstowych (SMS) wymienianych przez funkcjonariuszy straży granicznej. W artykule skupiono się na nowych funkcjonalnościach centrum,...

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• Emulator and simulator of Terma SCANTER and ARPA radar data server

  Publication

  • M. Sac
  • S. Kaczmarek
  • M. Narloch

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2019

  The software solutions presented in this paper generate real-time data compatible with ARPA radar standard as well as Terma SCANTER 2001 radar cooperating with Video Distribution and Tracking (VDT) server. Two different approaches to this problem are considered: emulation based on the data captured from real devices and simulation of objects on the sea. For both of them architecture, implementation details and functional test results...

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• Multimedialny system nadzoru dla straży granicznej – projekt STRADAR

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • J. A. Litka (formerly: J. Litka)
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2019

  STRADAR jest systemem nadzoru przeznaczonym do wspierania działań operacyjnych morskiej straży granicznej, umożliwiającym zbieranie, przetwarzanie i udostępnianie informacji i danych pochodzących z takich sensorów, jak radary, kamery wideo, AIS, GPS, aparaty fotograficzne oraz z połączeń audio, wiadomości SMS, plików i notatek. Informacje te mogą być udostępniane na bieżąco oraz archiwalnie z synchronizacją zdarzeń lub bez synchronizacji....

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• Quality Parameters in IMS/NGN Networks

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2019

  The Next Generation Network (NGN) architecture, including elements of the IP Multimedia Subsystem (IMS) concept, is a proposition of a telecommunication network dedicated to the needs of current and future information society. The main goal of NGN is to provide Quality of Service (QoS), for which proper network design is necessary with respect to among others standardized call processing performance parameters, including expected...

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• ROZPROSZONY SYSTEM KOMUNIKACJI I NADZORU DLA MORSKIEGO ODDZIAŁU STRAŻY GRANICZNEJ – PROJEKT STRADAR

  Publication

  • S. Kaczmarek
  • M. Blok
  • B. Czaplewski
  • J. A. Litka
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2019

  System STRADAR to wynik realizacji projektu, którego gestorem jest MO SG. Był on współfinansowany przez NCBiR. W artykule opisano system, przedstawiając ogólną koncepcję, architekturę, elementy funkcjonalne i realizację oprogramowania zainstalowanego w tych elementach. Krótko scharakteryzowano także testy, jakim poddano system, który na tym etapie – jako całość – osiągnął VII poziom gotowości technologii.

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• Stradar - Multimedia Dispatcher and Teleinformation System for the Border Guard

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • J. A. Litka
  • M. Narloch
  • M. Sac

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2019

  Security of national borders requires utilization of multimedia surveillance systems automatically gathering, processing and sharing various data. The paper presents such a system developed for the Maritime Division of the Polish Border Guard within the STRADAR project. The system, apart from providing communication means, gathers data, such as map data from AIS, GPS and radar receivers, videos and photos from camera or audio from...

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Year 2018

• Analysis of IMS/NGN Call Processing Performance Using Phase-Type Distributions Based on Experimental Histograms

  Publication

  • S. Kaczmarek
  • M. Sac

  - Advances in Intelligent Systems and Computing - Year 2018

  The paper describes our further research done with the proposed analytical and simulation traffic models of the Next Generation Network (NGN), which is standardized for delivering multimedia services with strict quality and includes elements of the IP Multimedia Subsystem (IMS). The aim of our models of a single IMS/NGN domain is to evaluate two standardized call processing performance parameters, which appropriate values are very...

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• Design of a Multidomain IMS/NGN Service Stratum

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2018

  The paper continues our research concerning the Next Generation Network (NGN), which is standardized for delivering multimedia services with strict quality and includes elements of the IP Multimedia Subsystem (IMS). A design algorithm for a multidomain IMS/NGN service stratum is proposed, which calculates the necessary CSCF servers CPU message processing times and link bandwidths with respect to the given maximum values of mean...

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• Streaming Real-time Data in Distributed Dispatcher and Teleinformation Systems for Visualization of Multimedia Data of the Border Guard

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • J. A. Litka
  • M. Narloch
  • M. Sac

  - TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation - Year 2018

  Surveillance of the sea borders is a very important task for the Border Guard. Monitoring of country maritime border is an important task of the Border Guard. This task can be facilitated with the use of the technology enabling gathering information from distributed sources and its supervision and visualization. This task can be accomplished using a technology that allows to collect information from distributed sensors of different...

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Year 2017

• STRADAR – rozproszony system dyspozytorski i teleinformatyczny dla Straży Granicznej

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • J. A. Litka
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2017

  Efektywne działanie służb granicznych wymaga odpowiedniego wsparcia w dziedzinie infrastruktury telekomunikacyjnej i informacyjnej. W artykule opisano system, który spełnia oczekiwania tych służ, dotyczące gromadzenia, przetwarzania i dynamicznego udostępniania danych multimedialnych, pozyskiwanych przez jednostki mobilne, punkty obserwacyjne i centrum. Tymi danymi są sygnały wideo, komunikaty SMS/SDS, obrazy, pliki, notatki. Przedstawiono...

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• The central server of the Border Guard's distributed multimedia system for monitoring and visualisation of ongoing and archival events

  Publication

  • M. Blok
  • S. Kaczmarek
  • M. Narloch
  • M. Sac

  - Journal of Marine Engineering and Technology - Year 2017

  The paper presents the architecture and functionalities of the central server (CENTER) of the distributed system for the Polish Border Guard (BG) for monitoring maritime areas. The overall system has been extended to incorporate, apart from map data, also different multimedia elements such as video from cameras or audio from telephone connections operated by BG units. This requires new system elements: Archive Servers for storing...

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• The System of the Supervision and the Visualization of Multimedia Data for BG

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • J. A. Litka
  • M. Narloch
  • M. Sac

  - Year 2017

  Monitoring of country maritime border is an important task of the Border Guard. This task can be facilitated with the use of the technology enabling gathering information from distributed sources and its supervision and visualization. The system presented in the paper is an extension and enhancement of the previously developed distributed system map data exchange system. The added functionalities allow supplementation of map data...

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Year 2016

• A system of visualization of operational situation on digital maps for mobile units of the Border Guards

  Publication

  • B. Czaplewski
  • K. Cwalina
  • M. Blok
  • S. Kaczmarek
  • M. Miszewski
  • M. Młynarczuk
  • M. Sac

  - Year 2016

  Border guards have to be equipped with technology enabling a communication, an acquisition, an exchange, and a visualization of data in different operational situations. This also applies to the staff, which is located on mobile units such as ground vehicles, aircrafts and vessels. Within the project realized for the Polish Border Guard and financed by The National Centre for Research and Development, a system was designed and...

• Cache service for maps presentation in distributed information data exchange system

  Publication

  • M. Blok
  • S. Kaczmarek
  • M. Młynarczuk
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2016

  The paper presents the proposition of caches implementation for map presentation in distributed information data exchange system. The concept of cache service is described in the context of distributed information data exchange system elements which control and present on maps positions and other identification data of vessels and other suspicious objects on the territorial sea, sea-coast and the internal sea-waters. The proposed...

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• Multimedia distributed system for visualization of ongoing and archival events for BG

  Publication

  • M. Blok
  • B. Czaplewski
  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Year 2016

  The paper presents concept of the distributed system designed to gather and provide the information about vehicles, vessels and airplanes present within the area of operations of the Border Guard supplemented with related multimedia. The part of the system related to the map data gathering, distribution and visualization has been already implemented in the preceding project. The presented system is the expansion of the previous...

• Real-time generator of AIS/ARPA/GPS data

  Publication

  • S. Kaczmarek
  • M. Sac

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2016

  The paper presents a real-time generator of AIS/ARPA/GPS position data in the standardized NMEA 0183 text format. Position data are produced by a set of various types of ships simulated on the Polish part of the Baltic Sea and are generated on defined IP/UDP addresses and RS-232 ports. In the simulation an extensive set of input parameters is taken into account including the number of particular types of ships, their dimensions,...

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• Simulation Model of IMS/NGN with Transport Stratum Based on MPLS Technology

  Publication

  • S. Kaczmarek
  • Ł. Łuczaj
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2016

  In the paper we continue our research on traffic modelling in the Next Generation Network (NGN) architecture, which includes the IP Multimedia Subsystem (IMS) elements. A simulation model of a single NGN domain with transport stratum based on the Multiprotocol Label Switching (MPLS) technology is proposed, which allows evaluation of mean response time of this stratum. The simulation model is applied to verify the results obtained...

• Verification of the Analytical Traffic Model of a Multidomain IMS/NGN Using the Simulation Model

  Publication

  • S. Kaczmarek
  • M. Sac

  - Advances in Intelligent Systems and Computing - Year 2016

  In this paper we verify the previously proposed analytical traffic model of a multidomain Next Generation Network (NGN), which is standardized for delivering multimedia services based on the IP Multimedia Subsystem (IMS). For this reason a proper simulation model used, in which not theoretical queuing system models but the operation of real network elements and standardized call scenarios are accurately implemented. Consequently,...

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Year 2015

• Database for integration of information in distributed data exchange system elements of Border Guard

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Sac

  - Zeszyty Naukowe Akademii Marynarki Wojennej - Year 2015

  The paper presents the database solution for integration of information in distributed data exchange system elements of the Polish Border Guard. The proposed database solution is described in the context of data exchange system elements which control position and store identification data of vessels (fishing, sports and sailing boats) and other suspicious objects on the territorial sea, sea-coast and the internal sea-waters controlled...

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Year 2014

• Call Processing Performance in a Multidomain IMS/NGN with Asymmetric Traffic

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2014

  In this paper we continue our research using the previously proposed analytical traffic model of a multidomain Next Generation Network (NGN), which is standardized for delivering multimedia services based on the IP Multimedia Subsystem (IMS). The aim of the model is to assess mean Call Set-up Delay (CSD) and mean Call Disengagement Delay (CDD), which are standardized call processing performance parameters. The output variables...

• TRAFFIC MODEL OF A MULTIDOMAIN IMS/NGN

  Publication

  • S. Kaczmarek
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2014

  In this paper we continue our research and present an analytical traffic model of a multidomain Next Generation Network (NGN), which is standardized for delivering multimedia services based on the IP Multimedia Subsystem (IMS). The model takes into account several service scenarios (including registration, intra- and inter-operator calls) and a large set of network parameters. Using the model mean Call Set-up Delay and mean Call...

• Variable Fractional Delay Filter Design Using a Symmetric Window

  Publication

  • M. Blok
  • M. Sac

  - CIRCUITS SYSTEMS AND SIGNAL PROCESSING - Year 2014

  In this paper a numerically efficient method for designing a nearly optimal variable fractional delay (VFD) filter based on a simple and well-known window method is presented. In the proposed method a single window extracted from the optimal filter with fixed fractional delay (FD) is divided into even and odd part. Subsequently, the odd part is discarded and symmetric even part of the extracted window is used to design a family...

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Year 2013

• Analysis of IMS/NGN call processing performance using G/G/1 queuing systems approximations

  Publication

  • S. Kaczmarek
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2013

  The paper concerns the Next Generation Network (NGN), which is standardized for distribution of multimedia services based on the IP Multimedia Subsystem (IMS). To guarantee quality, accurate traffic models of IMS/NGN should be proposed. In the paper we compare results obtained with our analytical and simulation model of a single IMS/NGN domain, where various queuing systems are used in the analytical model (M/G/1 and approximations...

• Analysis of IMS/NGN call processing performance using phase-type distributions

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2013

  This work is a continuation of our research on the traffic model dedicated for design and analysis of the Next Generation Network (NGN), which is standardized for distribution of current and future multimedia services based on the IP Multimedia Subsystem (IMS). Our analytical and simulation models allow evaluation of mean Call Set-up Delay E(CSD) as well as mean Call Disengagement Delay E(CDD) in a single domain of IMS/NGN. Ensuring...

• Approximation of Message Inter-Arrival and Inter-Departure Time Distributions in IMS/NGN Architecture Using Phase-Type Distributions

  Publication

  • S. Kaczmarek
  • M. Sac

  - Journal of Telecommunications and Information Technology - Year 2013

  Currently it is assumed that requirements of the information society for delivering multimedia services will be satisfied by the Next Generation Network (NGN) architecture, which includes elements of the IP Multimedia Subsystem (IMS) solution. In order to guarantee Quality of Service (QoS), NGN has to be appropriately designed and dimensioned. Therefore, proper traffic models should be proposed and applied. This requires determination...

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• Call processing performance in multidomain IMS/NGN architecture

  Publication

  • S. Kaczmarek
  • M. Sac
  • M. Wołonkiewicz

  - Year 2013

  The Next Generation Network (NGN) architecture, which bases on the IP Multimedia Subsystem (IMS) concept, is a proposition of a telecommunication network dedicated to the needs of the modern information society. The main goal of NGN is to provide Quality of Service (QoS), for which proper network design and dimensioning are necessary. This also requires appropriate traffic models, which should be efficient and not excessively complicated...

• Traffic Model of IMS/NGN Architecture with Transport Stratum Based on MPLS Technology

  Publication

  • S. Kaczmarek
  • M. Kosek
  • M. Sac

  - International Journal of Electronics and Telecommunications - Year 2013

  Growing expectations for a fast access to information create strong demands for a universal telecommunication network architecture, which provides various services with strictly determined quality. Currently it is assumed that these requirements will be satisfied by Next Generation Network (NGN), which consists of two stratums and includes IP Multimedia Subsystem (IMS) elements. To guarantee Quality of Service (QoS) all NGN stratums...

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Year 2012

• Extensions of ETSI performance measurements methodology for statistical results analysis =Rozszerzenia metodologii pomiarów wydajności zaproponowanej przez ETSI przy statystycznej analizy wyników

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2012

  Next Generation Network (NGN) architecture was proposed by International Telecommunication Union Telecommunication Standardization Sector (ITU-T) to deliver telecommunication services satisfying the needs of modern society for an access to information. The core of NGN service stratum are IP Multimedia Subsystem (IMS) elements acting as service controls units. To assess performance of IMS components, European Telecommunications...

• Measurements of ASON/GMPLS connection control layer performance according to the ETSI methodology

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Metrology and Measurement Systems - Year 2012

  Measurements of performance have always been crucial for evaluation of telecommunication systems, especially for implementation of network control elements responsible for connection handling which regards to bandwidth reservation, modification and release. That problem also arises in Automatically Switched Optical Network/Generalized Multiprotocol Label Switching (ASON/GMLPS) architecture, which is considered as one of the components...

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• Message Inter-Arrival and Inter-Departure Time Distributions in IMS/NGN Architecture

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2012

  Currently is it assumed that requirements of the information society for delivering multimedia services will be satisfied by the Next Generation Network (NGN) architecture, which includes elements of the IP Multimedia Subsystem (IMS) solution. In order to guarantee Quality of Service (QoS), NGN has to be appropriately designed and dimensioned. Therefore, proper traffic models should be proposed and applied. This requires determination...

• Simulation model for assessment of IMS-based NGN call processing performance

  Publication

  • S. Kaczmarek
  • M. Kaszuba
  • M. Sac

  - Year 2012

  In current telecommunications it is assumed that demands of information society for quickly delivered services will be satisfied by Next Generation Network (NGN) architecture, which includes IP Multimedia Subsystem (IMS) elements. To guarantee Quality of Service (QoS), proper design and dimensioning of NGN is absolutely necessary, for which appropriate models have to be proposed. As NGN architecture is very complicated, the most...

• Simulation model of IMS/NGN call processing performance

  Publication

  • S. Kaczmarek
  • M. Kaszuba
  • M. Sac

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2012

  In current telecommunications it is assumed that demands of the information society for quickly delivered services will be satisfied by the Next Generation Network (NGN) architecture, which includes IP Multimedia Subsystem (IMS) elements. To guarantee Quality of Service (QoS), proper design and dimensioning of NGN is absolutely necessary, for which appropriate models have to be proposed. As the NGN architecture is very complicated,...

• Traffic model for evaluation of call processing performance parameters in IMS-based NGN

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2012

  In the modern world requirements for accurate and fast information distribution are becoming more and more important, which creates a strong necessity for appropriate telecommunication network architecture. Proposition of such an architecture is the Next Generation Network (NGN) concept, which in order to guarantee Quality of Service (QoS), should be correctly designed and dimensioned. For this reason proper traffic models must...

• Zagadnienia inżynierii ruchu w sieciach NGN bazujących na IMS

  Publication

  • S. Kaczmarek
  • M. Sac

  - Year 2012

  Spełnienie wymagań dotyczących szybkości i dokładności dostarczania informacji powoduje konieczność wprowadzenia i poprawnego zaprojektowania sieci telekomunikacyjnych następnej generacji. W tym celu należy wskazać i zastosować odpowiednie modele ruchowe i metody inżynierii ruchu, czemu poświęcono niniejszą pracę. W pracy zaprezentowano standaryzację i architektury koncepcji IMS (IP Multimedia Subsystem) oraz bazujących na niej...

Year 2011

• A nearly optimal fractional delay filter design with asymmetric window

  Publication

  • M. Sac
  • M. Blok

  - International Journal of Electronics and Telecommunications - Year 2011

  W pracy przedstawiono wyniki badań nad zastosowaniem asymetrycznego okna wyodrębnionego zawczasu z filtru optymalnego. Pokazano, że takie podejście przy zastosowaniu dodatkowej korekcji wzmocnienia filtru zależnej od opóźnienia filtru pozwala na projektowanie filtrów prawie optymalnych. W efekcie zaproponowana metoda łączy prostotę metody okien z jakością porównywalną do jakości filtrów optymalnych. Efektywność zaprezentowanej...

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• Evaluation of ASON/GMPLS Connection Control Servers Performance

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Year 2011

  Performance aspects have always been very important in telecommunications, especially in control elements. That problem also regards ASON/GMLPS network, which is one of the propositions for Next Generation Network (NGN) transport stratum. In this paper we investigate performance of ASON/GMPLS Connection Control Servers (CCSs) in laboratory testbed, which architecture and operation are also described. In order to evaluate the performance...

• Review of Diameter protocol implementations for realization of communication in NGN networks

  Publication

  • M. Narloch
  • M. Sac

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2011

  In the paper Diameter protocol as well as its applications in the context of Next Generation Network (NGN) are described. Diameter message content and Attribute-Value Pairs (AVPs) concept are presented. Critical review of open source Diameter implementations is carried out. The performed analysis takes into consideration programming language, availability, support and documentation aspects. Basing on the review project fulfilling...

• Rozszerzenia protokołów komunikacyjnych dla celów sterowania siecią ASON/GMPLS

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2011

  Ciągły rozwój społeczeństwa informacyjnego niesie za sobą konieczność wprowadzenia jednolitej architektury sieci telekomunikacyjnej udostępniającej różnorodne usługi. Jedną z propozycji takiej architektury jest koncepcja sieci następnej generacji (Next Generation Network, NGN), dla realizacji której rozważa się wykorzystanie rozwiązania ASON/GMPLS. Realizacja koncepcji ASON/GMPLS wymaga implementacji protokołów na potrzeby sterowania...

• The Realization of NGN Architecture for ASON/GMPLS Network

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Journal of Telecommunications and Information Technology - Year 2011

  For the last decades huge efforts of telecommunication,Internet and media organizations have been focusingon creating standards and implementing one common networkdelivering multimedia services - Next Generation Network.One of the technologies which are very likely to beused in NGN transport layer is ASON/GMPLS optical network.The implementation of ASON/GMPLS technology usingopen source software and its results are the subject...

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• Traffic Modeling in IMS-based NGN Networks

  Publication

  • S. Kaczmarek
  • M. Sac

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2011

  In the modern world the need for accurate and quickly delivered information is becoming more and more essential. In order to fulfill these requirements, next generation telecommunication networks should be fast introduced and correctly dimensioned. For this reason proper traffic models must be identified, which is the subject of this paper. In the paper standardization of IMS (IP Multimedia Subsystem) concept and IMS-based NGN...

Year 2010

• Methodology of Conformity Testing of VoIP Connections Scenarios for SIP Protocol

  Publication

  • S. Kaczmarek
  • M. Sac

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2010

  Conformity and conformity testing have always had a crucial role in telecommunications. These issues are especially important in VoIP technology with SIP protocol as there are many hardware, software and service implementations. In this paper a methodology of automatic conformity testing of VoIP connections scenarios applying to any IP network is proposed. Example implementation of the methodology as Linux shell scripts is presented....

• Realizacja warstwy serwerów sterowania połączeniami dla ASON/GMPLS

  Publication

  • S. Kaczmarek
  • M. Młynarczuk
  • M. Narloch
  • M. Sac

  - Year 2010

  W materiale przedstawiono wyniki prac badawczych wykonanych w ramach projektu PBZ w podprojekcie Architektury i protokoły sieciowe. Obejmują krótką charakterystykę wytworzonych modeli analitycznych i symulacyjnych przeznaczonych do badania sieci pakietowych z gwarancją jakości klas usług dla technologii IP QoS, MPLS, OBS oraz uzyskane wyniki. Jednakże główny punkt ciężkości został położony na sieci z architekturą ASON/GMPLS dla...