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Tytuł:
Available Bandwidth and RSRP Based Handover Algorithm for LTE/LTE-Advanced Networks Tested in LTE-Sim Simulator
Autorzy:
Angri, Ismail
Najid, Abdellah
Mahfoudi, Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/226002.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mobility management
handover
LTE
lte-sim
available bandwidth
RSRP
Opis:
In this paper, we propose a new algorithm that improves the performance of the operation of Handover (HO) in LTE-Advanced (LTE-A) networks. As recognized, Mobility Management (MM) is an important pillar in LTE/LTE-A systems to provide high quality of service to users on the move. The handover algorithms define the method and the steps to follow to ensure a reliable transfer of the UEs from one cell to another without interruption or degradation of the services offered by the network. In this paper, the authors proposed a new handover algorithm for LTE/LTE-A networks based on the measurement and calculation of two important parameters, namely the available bandwidth and the Received Power (RSRP) at the level of eNodeBs. The proposed scheme named LTE Available Bandwidth and RSRP Based Handover Algorithm (LABRBHA) was tested in comparison with well-known algorithms in the literature as the LHHA, LHHAARC and the INTEGRATOR scheme using the open source simulator LTE-Sim. Finally, the network performances were investigated via three indicators: the number of lost packets during the handover operation, the latency as well as the maximum system throughput. The results reported that our algorithm shows remarkable improvements over other transfer schemes.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 85-93
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobile IoT Systems in the Urban Area
Autorzy:
Kosiło, Tomasz
Radecki, Karol
Marski, Jarosław
Górski, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/226020.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
telecommunications
NB-IoT
LTE
LTE-M
NRSRP
NRSSI
coverage enhancement (CE)
Opis:
An important element of Internet of Things systems (IoT) is wireless data transmission. Narrowband Internet of Things (NB-IoT) and LTE Cat M1 (LTE-M) are the new standards for such transmission intended for LTE cellular networks. Cellular network operators has recently launched such transmission. The article presents the results of measurements of NB-IoT transmission parameters in this network, inside the building and in open urban areas. The main features of the NB-IoT system and measuring equipment are briefly discussed.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 1; 179-185
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:
Trunked Radio Solutions for Special Applications
Autorzy:
Gajewski, S.
Gajewska, M.
Katulski, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226766.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LTE
trunked radio
TETRA
DMR
Opis:
In the paper modern concepts of radio communication trunking-dispatch systems for special applications are presented. Basic standards of TETRA, DMR, and cdma2000 are mentioned. The aim of the paper is to present innovative trunking solutions based on the LTE system working both in FDD and TDD mode. The architecture of LTE trunked radio is shown as well as new services possible to implementation are described. The way of TETRA and LTE integration is characterized.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 4; 309-314
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sharing Spectrum UE LTE and Air-Traffic Control Radars in 800 MHz Band
Autorzy:
Tikhvinskiy, V.
Bochechka, G.
Korchagin, P.
Seilov, S.
Gryazev, A.
Powiązania:
https://bibliotekanauki.pl/articles/307718.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
EMC
LTE
protection criteria
radiolocator
Opis:
The need to ensure LTE network coverage in sparsely populated and rural areas of Europe (ITU Region 1) has led to a massive use of 800 MHz band (band 20) with its good characteristics of radio wave propagation in LTE networks. However, the frequency band of 800 MHz called “digital dividend” in Region 1 is used on a primary basis not only by the terrestrial mobile service but also by air-traffic control radars (ATCR) that can lead to the creation of harmful interferences at the receivers’ input of ATCR. Such scenarios of mutual interferences became possible after granting licenses for LTE-800 frequencies to operators in such countries as Azerbaijan, Kazakhstan, Russia and other CIS countries, so this problem should be solved by operators at the deployment of LTE-800 networks in airports and areas close to them. So far, for such scenarios the ITU and CEPT have not formulated criteria for interference protection. The proposed protection criteria for receivers of ATCR from user devices’ interferences of LTE-800 networks were tested by experimental studies and can provide a solution to the electromagnetic compatibility (EMC) problem in a complex electromagnetic environment of modern airports and cross-order coordination of 800 MHz frequency bands in Region 1.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 2; 49-53
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologia LTE dla łączności z pojazdem komunikacji miejskiej
LTE technology for communication with public transport vehicles
Autorzy:
Gębczyński, Tomasz
Apiecionek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/41205343.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Tematy:
LTE
sieci IP
IP network
Opis:
Obecnie najczęściej wybieraną technologią dostępu do sieci Internet jest technologia LTE. Gwarantuje ona uzyskania dużych przepływności danych przy stosunkowo niskich kosztach użytkowania. W niniejszym artykule dokonano analizy wykorzystania technologii LTE do celów monitorowania pojazdów transportu publicznego zapewniając dodatkowo łączność głosową oraz dostęp do obrazu video przekazywanego z pojazdu. W ramach weryfikacji projektu wykonano testy praktyczne prędkości transmisji danych, których wyniki nakazują weryfikację założeń projektu, czego dokonano w podsumowaniu.
Currently, the most chosen technology for mobile Internet access is LTE. It guarantees achieve high data rates at relatively low cost use. This paper analyzes the use of LTE technology for the monitoring of public transport vehicles in addition to providing voice communication and access to the video image transmitted from the vehicle. As a part of the design verification some tests were performed. These tests were data transmission speed and network signal strength. The results provide requirements for the verification of the assumptions of the project, which has been made in the summary.
Źródło:
Studia i Materiały Informatyki Stosowanej; 2014, 15; 24-28
1689-6300
Pojawia się w:
Studia i Materiały Informatyki Stosowanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary Analysis of GSM, UMTS and LTE Mobile Network Architectures
Autorzy:
Ochang, Paschal A.
Irving, Philip J.
Powiązania:
https://bibliotekanauki.pl/articles/1191210.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
GSM
UMTS
LTE
Network Achitecture
Security
Bandwidth
Opis:
The Global System for Mobile Communications (GSM) which is a standard for 2G (second generation) cellular networks has created an avenue for the development of 3G (third generation) and 4G (fourth Generation) cellular network standards such as Universal Mobile Telecommunications System (UMTS) and long term evolution (LTE). With the deployment of new technologies still on the way, the era beyond 3G and 4G requires that cellular and radio technologies need to work together forming highly heterogeneous networks, therefore this paper analyses already existing cellular network technologies such as LTE, GSM and UMTS in order to give a general understanding of their architectures, functional and evolutional dependencies and also to provide an evolutionary trend and a clear overview of the support provided for other telecommunications infrastructure.
Źródło:
World Scientific News; 2016, 54; 27-39
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of LTE Downlink Channel Estimation Performance by Using an Adaptive Pilot Pattern
Autorzy:
Youssefi, M. A.
Abbadi, J. E.
Powiązania:
https://bibliotekanauki.pl/articles/307570.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel estimation
LTE
MIMO
OFDM
pilot pattern
Opis:
This paper proposes an adaptive pilot pattern to improve channel estimation performance for LTE downlink system with high mobility. The downlink pilot positions are predefined in the time and frequency domain with fixed pilot pattern in LTE standard. However, that pilot structure is not efficient in a fast time varying channel, and leads to a decrease of channel estimation performance. The authors propose and evaluate the performance of LTE downlink channel estimation using an adaptive pilot scheme to optimally use pilot tones over time varying channels. It is shown that only seven bits of additional wide-band feedback per frame and per user are required to optimally support adaptive pilot pattern. Simulation results show that the proposed method allows high performance in terms of throughput and channel estimation error. This analysis shows that LTE downlink throughput could be increased over 4%.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 2; 59-63
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Area Energy Efficiency of LTE Macro Base Stations in Different Environments
Autorzy:
Shahab, S. N.
Abdulkafi, A. A.
Zainun, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/308271.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Area Energy Efficiency
LTE
Macro Base Station
Opis:
Energy efficiency (EE) of wireless telecommunications has become a new challenge for the research community, governments and industries in order to reduce CO2 emission and operational costs. EE of base stations (BSs) in cellular networks is a growing concern for cellular operators to not only maintain profitability, but also to reduce the overall negative impact to the environment and economic issues for wireless network operators. In this paper, a framework focuses on the Area Energy Efficiency (AEE) evaluation of LTE BSs is presented. The parameters affect on the AEE and the coverage area of LTE BS in different scenarios are investigated. AEE analysis has been done using a few key performance indicators including transmit power, bandwidth, load factor with the assumption of different scenarios (urban, suburban and rural). The simulation results show that the LTE BSs have better AEE in an urban environment for cell radius less than 750 m compare with the suburban and rural environments. Furthermore, it is obvious that there is a strong influence of traffic load, BW and transmission power on AEE of LTE network. On the other hand, AEE increases significantly as the BW size increases. Finally, it has been shown that the AEE of LTE macro BS decreases with increasing the percentage of traffic load for all scenarios.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 59-66
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
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:
Hardware Implementation of MISO on Orthogonal Frequency Division Multiplexing Platform with the Help of Alamouti Algorithm
Autorzy:
Kilaru, S.
Powiązania:
https://bibliotekanauki.pl/articles/226220.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MISO
SISO
FPGA
Xilinx
BER
SNR
Alamouti
LTE
Opis:
Many software based OFDM techniques were proposed from last half decade to improve the performance of the system. This paper tried to implement the same with Hardwar implementation. We created Hardware based MISO platform with OFDM. We implemented Alamouti algorithm on this test bed. The test bed is implemented with the help of Field Programmable Gate Array (FPGA). The test bed is functionalized with the help of FPGA through Xilinx based system generator for DSP. In this paper we considered the 2×1 MISO implementation with Alamouti algorithm. The simulation results showed that BER and SNR are considerably high for MISO than SISO. The results also proved that proposed OFDM based Alamouti implementation for MISO is excellent in all performance criterions.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 2; 137-143
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measured Interference of LTE Uplink Signals on DVB-T Channels
Autorzy:
Celidonio, M.
Masullo, P. G.
Pulcini, L.
Vaser, M.
Powiązania:
https://bibliotekanauki.pl/articles/308267.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
DVB-T
LTE
TV Interference
UHF Measurements
uplink
Opis:
Because of the decision, taken during the ITU WRC-07, to allocate the upper part of the so-called digital dividend spectrum for mobile services on a co-primary basis with TV broadcast services, the involved stakeholders have a great interest in avoiding any interference caused by signals transmitted in adjacent bands. In this context the paper presents some experimental results of a study addressed to assess the effects produced by an interferential LTE signal transmitted from a user terminal when it is in proximity of a television antenna that receives DVB-T signals. The study has been conducted in the context of collaboration between Fondazione Ugo Bordoni and ISCTI, the scientic and technical body of the Italian Ministry of Economic Development, using high professional laboratory equipments and considering different experimental simulation test setups. Several simulation scenarios have been analyzed and results in terms of protection ratio and protection distance have been carried out.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 4; 74-85
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LTE/GNSS IOT technology as a backbone for airport ground handling operations
Autorzy:
Piech, Adam
Kwapiński, Maciej
Mickiewicz, Maciej
Kanawka, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2173476.pdf
Data publikacji:
2022
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
GNSS
LTE
IoT
asset tracking
ground handling
obsługa naziemna
Opis:
The necessity of a positioning service for various ground handling assets is key to improving airport performance. Reported in this article is a system named “Ground Eye”, designed to be a test of a possible implementation of the independent LTE-based communication system and GNSS-based location services. The test campaign used a total of nine prototype devices for a period of one month at Gdańsk airport (Poland). The main goal of this demonstration was to verify the possibility of using the GNSS/LTE system as a fast-deployment option in the airport environment, as well as to evaluate its positioning and communication capabilities in conjunction with React.JS/Deck.GL/Node.JS dedicated application. The test campaign verified that even with simple processing and relatively simple single-frequency measurements, multi-constellation GNSS receivers, it is possible to obtain location with precision reaching better than 2.5 metres. This precision should be good enough for all ground handling operations at modern airports, without the need for additional fixed infrastructure.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 114; 131--142
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Link Quality Assessment Algorithm for Heterogeneous Self-organizing Maritime Communications Network
Autorzy:
Bronk, K.
Lipka, A.
Niski, R.
Powiązania:
https://bibliotekanauki.pl/articles/307958.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
3G
cellular systems
link quality indicator
LTE
maritime radiocommunications
Opis:
The article introduces a method of performing a radio link quality assessment based on the Link Quality Indicator (LQI) which will be calculated for every system that is available. The method presented has been developed during the netBaltic project completed in Poland and generally applies to the so-called maritime zone A, i.e. the sea area where ships are still within the range of shore-based radio communication systems, particularly 3G/LTE cellular networks. The algorithm was developed based on the results of measurements obtained during two separate campaigns. That measurement data served as a basis for the method’s initial assumptions and was utilized during the method’s verification.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 2; 32-40
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Requirements of 4G-Based Mobile Broadband on Future Transport Networks
Autorzy:
Fricke, M.
Heckwolf, A.
Herber, R.
Nitsch, R.
Schwarze, S.
Voß, S.
Powiązania:
https://bibliotekanauki.pl/articles/309203.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
backhauling
LTE advanced
mobile network de-sign
X2 interface
Opis:
Long term evolution technologies provide new standards in mobile communications regarding available bandwidth. It is expected that users of one radio cell will share more than 100 Mbit/s in future. To take advantage of the full feature set of next generation mobile networks, transport network design has to face new requirements, caused by the architectural changes of LTE technologies. Especially the newly defined X2 interface impacts on the transport network requirements. X2 enables direct communication between evolved base stations (eNBs) and thus, enforces local solutions. At the same time a tendency of locating network elements at fewer, central sites to reduce operational expenditure can be observed, in particular concerning the transport layer. This leads to the question of how the direct X2 connection of eNBs on the logical layer can be accommodated with a general centralization of transport networks. Our considerations show that for LTE, a centralized transport network is able to realize the local meshing between eNBs. However, for LTE Advanced, the standards currently discussed by the 3GPP initiative could lead to enhanced requirements on the X2 interface latency. Consequently, the implications for the network architecture have to be analyzed in more detail.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 21-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Analysis of QoS Management and Technical Requirements in 3GPP Standards for Cellular IoT Technologies
Autorzy:
Tikhvinskiy, V.
Bochechka, G.
Gryazev, A.
Aitmagambetov, A.
Powiązania:
https://bibliotekanauki.pl/articles/309435.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
3GPP
EC-GSM
LTE
NB-IoT
QoS
standardization
RAT
Opis:
Optimization of 3GPP standards that apply to cellular technologies and their adaptation to LPWAN has not led to positive results only enabling to compete on the market with the growing number non-cellular greenfield LPWAN technologies – LoRa, Sigfox and others. The need to take into consideration, during the 3GPP standard optimization phase, the low-cost segment of narrow-band IoT devices relying on such new technologies as LTE-M, NB-IoT and EC-GSM, has also led to a loss of a number of technical characteristics and functions that offered low latency and guaranteed the quality of service. The aim of this article is therefore to review some of the most technical limitations and restrictions of the new 3GPP IoT technologies, as well as to indicate the direction for development of future standards applicable to cellular IoT technologies.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 2; 41-47
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
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:
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:
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:
Quality management in 4G wireless networking technology allows to attend high-quality users
Autorzy:
Langer, M.
Powiązania:
https://bibliotekanauki.pl/articles/309463.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
4G
device-to-device communication
LTE
policy management
QoS
Opis:
The 4G networks are all-IP based heterogeneous networks that allow users to use any system at anytime and anywhere, and support a variety of personalized, multimedia applications such as multimedia conferencing, video phones, video/movie-on-demand, education-on-demand, streaming media, multimedia messaging, etc. Personalized services should be supported by personal mobility capability, which concentrates on the movement of users instead of users’ terminals. As the technology matures, traffic congestion increases, and competitive pressures mount, QoS and policy management will become more and more important. Also the users come with a number of new requirements on connectivity, and D2D networking technology must follow the idea of “Internet of things”. Operators must make sure they are working with vendors that have a strong framework to supply end-to-end QoS and are capable of supporting evolving needs. The paper discusses qualitative and quantitative indicators of telecommunication services. Main challenges that need to be addressed by nowadays and future systems are shown, and within them the massive growth in traffic volume and in the number of connected devices seems to play the most key role.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 3; 48-55
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza symulacyjna wieloobiektowej aukcji rosnącej. Wnioski dla planowanej aukcji częstotliwości LTE w Polsce
Autorzy:
Sobolewski, Maciej
Formański, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/494259.pdf
Data publikacji:
2014-06-15
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
aukcja wieloobiektowa
aukcja częstotliwości
aukcja SMRA
symulator
usługi LTE
rynek telekomunikacyjny
Opis:
W drugiej połowie 2014 roku odbędzie się w Polsce procedura rezerwacji częstotliwości radiowych na potrzeby komercyjnych usług szybkiego Internetu (LTE). Z uwagi na ogromną wartość rynkową udostępnianych zasobów, po raz pierwszy w historii polskiego rynku telekomunikacyjnego, podział bloków wyłoniony będzie w drodze aukcji wieloobiektowej zorganizowanej przez Urząd Komunikacji Elektronicznej (UKE). Bazując na własnościach teoretycznych wybranego przez UKE mechanizmu aukcyjnego, zbudowaliśmy symulator aukcyjny, przy pomocy którego pokazujemy, jak może wyglądać przebieg aukcji 5 bloków częstotliwości w paśmie 800 Mhz oraz jakich przychodów można oczekiwać.
Źródło:
Decyzje; 2014, 21; 95-114
1733-0092
2391-761X
Pojawia się w:
Decyzje
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Open concurrent network communication methods in building distributed Web applications
Autorzy:
Buchwald, Paweł
Dawid, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1986993.pdf
Data publikacji:
2021-12-30
Wydawca:
Politechnika Gdańska
Tematy:
WebRTC
e-learning
LTE
LAN
WiFi
video transmission
jitter
delay
bandwidth
Opis:
The attractiveness of real-time multimedia communication as part of an e-learning platform largely depends on the quality of the telecommunications infrastructure and on theservices that support the exchange of audiovisual data. The research subject of this workis communication between stationary and mobile devices using distributed services such as Web Real-Time Communication (WebRTC) running in HTML5 compliant web browsers. The test connections were carried out in a peer-to-peer architecture over a local wireless WiFi network and a mobile network supporting the Long Term Evolution (LTE) standard for data interchange. Several audiovisual sessions between two clients were analyzed for different connection scenarios. Parameters responsible for the transmission quality, such as delay, jitter,packet loss, or the speed of sending and receiving video frames were measured for each scenario. Open audiovisual communication system performance experiments were conducted under real operating conditions. The obtained results indicated potential applications in the development of e-learning websites.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 4; 409-418
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency Reconfigurable Split Ring Antenna for LTE And WiMAX Applications
Autorzy:
Madhav, B. T. P.
Nadh, B.
Anilkumar, T.
Pardhasaradhi, P.
Rao, M. C.
Lakshman, P.
Powiązania:
https://bibliotekanauki.pl/articles/226800.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PIN diode
WiMAX
LTE 2500
split ring antenna
BAR64-02V
Opis:
This paper presents frequency reconfigurable dual band antenna for WiMAX and LTE 2500 band applications using four PIN diode switches. The antenna is compact in size with dimensions of 30 x 30 x 0.8 mm3 and designed on FR-4 dielectric substrate with a partial ground plane. The fabricated antenna operates in the frequency range of LTE and WiMAX (2.5-2.69 GHz and 3.4-3.6 GHz) respectively. The frequencies can be controlled by using PIN diodes and antenna attained the gain ranging of 3.34-4.46 dBi. This designed antenna resonating at 2.52 and 3.49 GHz when the PIN diodes are in ON state and resonating at 2.68 and 3.58 GHz when PIN diodes are in OFF state. The proposed antenna has bidirectional radiation at upper frequency bands and unidirectional at lower frequency bands. The proposed split ring structured antenna has the radiation efficiency of 94.12% at 2.52 GHz and 90.34% at 3.49 GHz in ON state. Antenna providing good agreement between the measured (Antenna measurement setup with VNA) and simulated results (Ansys-HFSS).
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 2; 255-260
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
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:
Next Generation Dynamic Inter-Cellular Scheduler
Autorzy:
Yağcıoğlu, Mert
Bayat, Oğuz
Powiązania:
https://bibliotekanauki.pl/articles/963803.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency reuse
Inter-Cell Interference Coordination
LTE
OFDMA
throughput
SINR
capacity
scheduling
load balancing
Opis:
Orthogonal frequency division multiple access (OFDMA) in Long Term Evolution (LTE) can effectively eliminate intra-cell interferences between the subcarriers in a single serving cell. But, there is more critical issue that, OFDMA cannot accomplish to decrease the inter-cell interference. In our proposed method, we aimed to increase signal to interference plus noise ratio (SINR) by dividing the cells as cell center and cell edge. While decreasing the interference between cells, we also aimed to increase overall system throughput. For this reason, we proposed a dynamic resource allocation technique that is called Experience-Based Dynamic Soft Frequency Reuse (EBDSFR). We compared our proposed scheme with different resource allocation schemes that are Dynamic Inter-cellular Bandwidth Fair Sharing FFR (FFRDIBFS) and Dynamic Inter-cellular Bandwidth Fair Sharing Reuse-3 (Reuse3DIBFS). Simulation results indicate that, proposed EBDSFR benefits from overall cell throughput and obtains higher user fairness than the reference schemes.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 441-448
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
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