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    Wyświetlanie 1-12 z 12
    Tytuł:
    Efficiency of the use of LTE system radio resources in highway transport environment
    Autorzy:
    Gajewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/393395.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    LTE
    resource management
    ICI
    SFR
    PFR
    transport application
    zarządzanie zasobami
    Opis:
    The paper describes the problem of analysis of throughput-coverage characteristics of the LTE system. Simulation results of the efficiency of the use of LTE radio resources are presented. Simulation studies on the basis of original model of the LTE network simulator were carried out. In addition, the evaluation of throughput for a single connection, and available capacity were evaluated in the context of the use of the same available frequency band in all cells of a cellular network. The results were also analysed in view of LTE transport applications. The results shows that from the point of view of transport applications of LTE better results on system performance gives the PFR method.
    Źródło:
    Archives of Transport System Telematics; 2014, 7, 2; 40-44
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Downlink Scheduling Algorithm Proposed for Real Time Traffic in LTE System
    Autorzy:
    Mahfoudi, M.
    EL Bekkali, M.
    Najid, S.
    Mazer, S.
    EL Ghazi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227115.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    QoS
    real-time traffic
    scheduling strategies
    Opis:
    The Third Generation Partnership Project (3GPP) has developed a new cellular standard based packet switching allowing high data rate, 100 Mbps in Downlink and 50 Mbps in Uplink, and having the flexibility to be used in different bandwidths ranging from 1.4 MHz up to 20 MHz, this standard is termed LTE (Long Term Evolution). Radio Resource Management (RRM) procedure is one of the key design roles for improving LTE system performance, Packet scheduling is one of the RRM mechanisms and it is responsible for radio resources allocation, However, Scheduling algorithms are not defined in 3GPP specifications. Therefore, it gets a track interests for researchers. In this paper we proposed a new LTE scheduling algorithm and we compared its performances with other well known algorithms such as Proportional Fairness (PF), Modified Largest Weighted Delay First (MLWDF), and Exponential Proportional Fairness (EXPPF) in downlink direction. The simulation results shows that the proposed scheduler satisfies the quality of service (QoS) requirements of the real-time traffic in terms of packet loss ratio (PLR), average throughput and packet delay. This paper also discusses the key issues of scheduling algorithms to be considered in future traffic requirements.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 4; 409-414
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the possibility of using transmission in the lte system on a selected railway line for the purpose of running railway traffic
    Autorzy:
    Chrzan, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1833612.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GSM-R
    LTE system
    open systems
    railway line
    railway traffic control
    system LTE
    linia kolejowa
    kontrola ruchu kolejowego
    Opis:
    The railway and the Rail Traffic Control Systems installed on it in Poland have recently experienced rapid technological development. This is undoubtedly due to the funds that Poland receives from the European Union for the modernization of railway infrastructure. The development of modern railway infrastructure means not only stations, modern rolling stock, but also safe and reliable train control systems based on the latest telecommunications and information technologies. For a longer time, radio communication based on the GSM-R (GSM for Railways) standard is being introduced on PKP. For this purpose, dedicated infrastructure is being built in order to use this technology for railway traffic. This is associated with huge investment costs. Since the beginning of its existence, research has been conducted worldwide on the use of LTE (Long Term Evolution) technology for conducting railway traffic. For economic and technological reasons, it is necessary to study other possibilities of using modern telecommunications infrastructure not yet dedicated to railway tasks in these open networks. The article will present research on the use of open radio communication network based on LTE standard for rail traffic and passenger comfort. It will discuss the research method and selected results of measurements made on railway line no. 4. The choice of this railway line was dictated by two factors. The first one resulted from the maximum train speed, the second one is the variety of rolling stock used on this line (compartmental and non-compartmental wagons). The part of research concerning collection of measurement material was performed within the framework of completed research work PBS3/A6/29/2015. As a result of conducted in-depth literature analysis as well as performed measurements and calculations, it allowed to develop a model and software for simulating system operation in real conditions. This system allows to send railway telegrams on appropriate safety level defined in standardization documents. The research proved the possibility of using an open system in the LTE standard for the transmission of signals for railway traffic control and passengers while maintaining an appropriate level of safety. The only limitations which were indicated by the tests are improper radio interface coverage of railway lines. Appropriate planning of radio coverage of railway areas by radio communication operators (so far ignored) with proper cooperation of infrastructure manager can lead to launching efficient communication system without necessity to build specialized infrastructure for railway.
    Źródło:
    Archives of Transport; 2021, 57, 1; 91-101
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O procesach konsolidacji na rynku komunikacji elektronicznej w Polsce
    About the mergers of the enterprises in electronic communication market in Poland
    Autorzy:
    Zieliński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/317418.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    komunikacja elektroniczna
    rynek telekomunikacyjny i medialny
    telekomunikacja stacjonarna
    telekomunikacja komórkowa
    telewizja
    system LTE
    fuzje firm operatorskich
    electronic communications
    telecommunication and media market
    cellular telecommunications
    fixed telecommunications
    television
    LTE system
    mergers of the operators
    Opis:
    Artykuł opisuje fuzje firm telekomunikacyjnych i medialnych oraz ważne znaczenie tych zmian dla rozwoju polskiego rynku komunikacji elektronicznej. Szczególnie podkreślono zakup firmy telekomunikacji komórkowej Polkomtel dokonanej przez holding Z. Solorza-Żaka i znaczenia tego wydarzenia dla wdrożenia systemu LTE w Polsce.
    The paper describes the mergers of the telecommunication and media enterprises and important meaning of these changes for the development of the electronic communication market in Poland. The paper especially emphasizes the meaning of the purchase of the cellular telecommunication company Polkomtel for implementation in Poland of the LTE system.
    Źródło:
    Telekomunikacja i Techniki Informacyjne; 2012, 1-2; 3-9
    1640-1549
    1899-8933
    Pojawia się w:
    Telekomunikacja i Techniki Informacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computationally-Efficient Design of a Dynamic System-Level LTE Simulator
    Autorzy:
    Munoz, P.
    Bandera, I. de la
    Ruiz, F.
    Luna-Ramirez, S.
    Barco, R.
    Toril, M.
    Lázaro, P.
    Rodriguez, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226262.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    LTE
    simulator
    RRM
    network
    link-level
    system-level
    E-UTRAN
    Opis:
    The Long-Term Evolution (LTE) is the next generation of current mobile telecommunication networks. LTE has a new flat radio-network architecture and a significant increase in spectrum efficiency. In this paper, a computationally-efficient tool for dynamic system-level LTE simulations is proposed. A physical layer abstraction is performed to predict link-layer performance with a low computational cost. At link layer, there are two important functions designed to increase the network capacity: Link Adaptation and Dynamic Scheduling. Other Radio Resource Management functionalities such as Admission Control and Mobility Management are performed at network layer. The simulator is conceived for large simulated network time to allow evaluation of optimization algorithms for the main network-level functionalities.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 3; 347-358
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations
    Autorzy:
    Backfrieder, C.
    Ostermayer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/226992.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mobile network simulation
    system levels
    long term evolution
    time division duplex
    variable switching point
    Opis:
    This paper introduces an LTE system level simulator and presents investigations of scenarios with differently balanced traffic emergence between uplink and downlink as well as inhomogeneous distribution of link direction asymmetry. In the TDD mode of LTE, duplexing is implemented via sharing the time domain between uplink and downlink users. This is done by different switching configurations, which offer varying capacity distributions between downlink and uplink, from a downlink-heavy configuration with 90 percent of the capacity in downlink direction to uplink heavy configurations with 60 percent uplink. We utilize the available capacity perfectly by adjusting the link configuration appropriately to traffic emergence. Performance gains when selecting a configuration appropriate to the arising traffic compared to usage of a static configuration with equally distributed capacity are investigated. In case of different configurations, additional interference can occur in neighbored cells due to distinct communication direction at the same time. We clarify the differences between these scenarios and quantify the gains and losses when the switching point between uplink and downlink is variable.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 2; 171-178
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LTE as a trunking-dispatch system
    LTE w roli systemu trankingowego-dyspozytorskiego
    Autorzy:
    Gajewski, S.
    Gajewska, M.
    Katulski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/955979.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    LTE
    trunking
    system
    tranking
    Opis:
    In the paper solutions of trunking-dispatch systems based on the LTE system are presented. The solution in the form of separate LTE/TDD trunking system is discussed, and the concept of the LTE/FDD trunking system operating in the infrastructure of public, mobile networks is characterised.
    W artykule przedstawiono rozwiązania systemów trankingowych-dyspozytorskich opartych na systemie LTE. Omówiono rozwiązanie w postaci odrębnego systemu trankingowego LTE/TDD oraz scharakteryzowano koncepcję systemu trankingowego LTE/FDD pracującego w oparciu o infrastrukturę publicznych sieci komórkowych.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2016, R. 57 nr 1 (204), 1 (204); 25-32
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza możliwych kierunków rozwoju systemu GSM-R
    Analysis of the potential development direction GSM-R
    Autorzy:
    Chrzan, M.
    Pirosz, P.
    Marek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/251717.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    system GSM-R
    LTE
    systemy radiokomunikacji ruchomej
    kolej
    GSM-R system
    mobile radio communication
    railways
    Opis:
    W artykule przedstawiono charakterystykę wykorzystywanych obecnie nowoczesnych systemów radiokomunikacji ruchomej przeznaczonych dla potrzeb kolei. Opisano w nim istniejące systemy bezprzewodowego przekazywania informacji oraz system LTE, który jest rozważany jako następca wprowadzanego w Polsce systemu GSM-R.
    The article presents the characteristics of currently used modern mobile radio communications systems designed for the needs of the railways. It describes the existing wireless communications systems, and LTE system, which is considered as the successor in Poland introduced GSM-R.
    Źródło:
    TTS Technika Transportu Szynowego; 2012, 9; 135-143, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance-increasing method of a wireless system based on determination of time-frequency localization properties of OFDM signal
    Autorzy:
    Stryhalyuk, B.
    Yaremko, O.
    Maksymyuk, T.
    Melnyk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/410853.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    LTE
    OFDM
    Time-Frequency Localization
    window function
    Dolph-Chebyshev function
    Opis:
    In this paper we have analyzed the properties of energy localization in time-frequency plane for rectangular pulse shape. The technique of space analysis of time-frequency localization (TFL) properties for pulse shapes was designed. We provide the method of OFDM signal synthesis with proper TFL based on the criteria of compactness and orthogonality. The comparative analysis of LTE system efficiency indexes for rectangular and compact pulses was conducted. The advantage of interference immunity and spectral efficiency for well-localized signals was proved.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 4; 49-54
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda szyfrowania telegramów kolejowych transmitowanych w sieciach otwartych z wykorzystaniem technologii LTE
    The encryption method of railway telegrams transmitted on open networks using on LTE technology
    Autorzy:
    Chrzan, M.
    Pirosz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/254368.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Naukowo-Wydawniczy TTS
    Tematy:
    LTE
    szyfrowanie
    system radiowy
    zabezpieczenia
    telegram kolejowy
    encryption
    radio system
    security
    railway telegram
    Opis:
    W artykule przedstawiono rozważania na temat wykorzystania na kolei zabezpieczeń otwartych systemów radiowych zgodnie z normą normie PN-EN 50159:2010. Zaprezentowano ogólne wyniki badań w zakresie metod szyfrowania i wpływu ich na opóźnienia w transmisji sygnału radiowego.
    Paper presents considerations on the use of open security on the railway radio systems in accordance with standard PN-EN 50159 : 2010 . General presented the results of research on encryption methods and the impact of delays in transmission of radio signal.
    Źródło:
    TTS Technika Transportu Szynowego; 2015, 12; 314-317, CD
    1232-3829
    2543-5728
    Pojawia się w:
    TTS Technika Transportu Szynowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of GSM, LTE and Wi-Fi Electromagnetic Radiation in Dwellings
    Autorzy:
    Karan, Y.
    As, N.
    Şahın, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031943.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    wireless network adapter
    electromagnetic radiation
    electromagnetic pollution
    global system for mobile communications
    wireless fidelity
    Opis:
    Electromagnetic radiation exposure increases with the rise of the wireless communication devices. Electromagnetic radiation, especially near 2400 MHz band, has gradually increased with the widespread of wireless fidelity adapter in indoor environment. In this study, electromagnetic radiation in dwellings where different Wi-Fi adapters and routers are used was assessed by measuring the electric field and compared with other electromagnetic radiation source and the limits set by the Information and Communication Technologies Authority. Measurements were taken in the range of 760-2690 MHz bands used by GSM, 3G/LTE and Wi-Fi technologies. The detected values for all frequencies are significantly lower than the limits of the Information and Communication Technologies Authority. Among the electromagnetic radiation sources, electromagnetic radiation of Wi-Fi adapter is higher than GSM/3G/LTE sources radiation in dwellings. Electromagnetic radiation values in nearest point of high power adapter Wi-Fi antenna are close to the Information and Communication Technologies Authority limit value. Results show that electromagnetic radiation based on Wi-Fi adapters or routers can be higher than GSM based electromagnetic radiation.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 509-512
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Approach to IP Scheduled Throughput Measurements in Dual Connectivity Systems
    Autorzy:
    Zięba, Arkadiusz
    Kollar, Martin
    Tatarczyk, Krzysztof
    Sadowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/27311949.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    IP Scheduled Throughput
    distributed system
    Edge computing
    cloud
    Long Term Evolution (LTE)
    Evolved Universal Terrestrial Radio Access Network (E-UTRAN)
    Carrier aggregation (CA)
    UE Throughput
    Key Performance Indicator (KPI)
    Quality of Experience (QoE)
    quality of service (QoS)
    Opis:
    IP scheduled throughput defined according to 3GPP TS 36.314 reflects user throughput regardless of traffic characteristics, and therefore has become one of the most important indicators for monitoring Quality of Service (QoS) of the end user in Evolved Universal Terrestrial Radio Access Network (E-UTRAN). However, networks built on a distributed architecture make the above definition impossible to be applied directly due to the implementation challenges. This paper gives an overview of the classical Long Term Evolution (LTE) architecture as opposed to Dual Connectivity (DC) topology and focuses on a novel method of solving the calculation issue with the IP scheduled throughput measurement in edge computing environment. Experimental results show a good agreement with the real end user perception.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 4; 645--654
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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