Temat: access networks - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Performance and Limitations of VDSL2-based Next Generation Access Networks
Autorzy:: Heliotis, G.
Dimos, L.-P.
Kordoulis, I.
Agapiou, G.
Powiązania:: https://bibliotekanauki.pl/articles/307882.pdf
Data publikacji:: 2013
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: DSL networks
impulse noise
VDSL2 next generation access networks
crosstalk
Opis:: In this paper, we first briefly review the main operational aspects of FTTC (xPON)/VDSL2 access networks. Then, we present performance measurements with respect to network sub loop operating length and VDSL2 operational profiles (8b, 12a, 17a), studying the rates that can be achieved at different scenarios. We then provide results of the effect of stationary crosstalk and non-stationary impulse noise on the provisioned service in an operating VDSL2 access network.
Źródło:: Journal of Telecommunications and Information Technology; 2013, 1; 98-102
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: RoFnet - Reconfigurable Radio over Fiber Network Architecture Overview
Autorzy:: Medeiros, M.
Avó, R.
Laurencio, P.
Correia, N.
Barradas, A.
Powiązania:: https://bibliotekanauki.pl/articles/308954.pdf
Data publikacji:: 2009
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: optical access networks
optical single sideband
radio over fiber
reflective semiconductor optical amplifiers
wavelength division multiplexing
Opis:: This paper introduces the basic operational concepts of the RoFnet - reconfigurable radio over fiber network, which is a project supported by the Portuguese Foundation forScience and Technology. This project proposes an innovative radio over fiber optical access network architecture, which combines a low cost base station (BS) design, incorporating reflective semiconductor optical amplifiers, with fiber dispersion mitigation provided by optical single sideband modulation techniques. Optical wavelength division multiplexing (WDM) techniques are used to simplify the access network architecture allowing for different BSs to be fed by a common fiber. Different wavelength channels can be allocated to different BSs depending on user requirements. Additionally, in order to improve radio coverage within a cell, it is considered a sectorized antenna interface. The combination of subcarrier multiplexing with WDM, further simplifies the network architecture, by using a specific wavelength channel to feed an individual BS and different subcarriers to drive the individual antenna sectors within the BS.
Źródło:: Journal of Telecommunications and Information Technology; 2009, 1; 38-43
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of Latency-Aware Network Slicing in 5G Packet xHaul Networks
Autorzy:: Klinkowski, Mirosław
Powiązania:: https://bibliotekanauki.pl/articles/27311921.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: 5G
radio access networks
packet-switched xHaul
latency-sensitive network
network slicing
traffic prioritization
network optimization
Opis:: Packet-switched xHaul networks are a scalable solution enabling convergent transport of diverse types of radio data flows, such as fronthaul / midhaul / backhaul (FH / MH / BH) flows, between remote sites and a central site (hub) in 5G radio access networks (RANs). Such networks can be realized using the cost-efficient Ethernet technology, which enhanced with time-sensitive networking (TSN) features allows for prioritized transmission of latency-sensitive fronthaul flows. Provisioning of multiple types of 5G services of different service requirements in a shared network, commonly referred to as network slicing, requires adequate handling of transported data flows in order to satisfy particular service / slice requirements. In this work, we investigate two traffic prioritization policies, namely, flowaware (FA) and latency-aware (LA), in a packet-switched xHaul network supporting slices of different latency requirements. We evaluate the effectiveness of the policies in a networkplanning case study, where virtualized radio processing resources allocated at the processing pool (PP) facilities, for two slices related to enhanced mobile broadband (eMBB) and ultra-reliable low latency communications (URLLC) services, are subject to optimization. Using numerical experiments, we analyze PP cost savings from applying the LA policy (vs. FA) in various network scenarios. The savings in active PPs reach up to 40% − 60% in ring scenarios and 30% in a mesh network, whereas the gains in overall PP cost are up to 20% for the cost values assumed in the analysis.
Źródło:: International Journal of Electronics and Telecommunications; 2023, 69, 2; 335--340
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Zużycie energii przez urządzenia abonenta sieci szerokopasmowej i jego konsekwencje
Energy consumption by home devices of broadband subscriber and its consequences
Autorzy:: Borzycki, K.
Powiązania:: https://bibliotekanauki.pl/articles/317412.pdf
Data publikacji:: 2012
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: szerokopasmowe sieci dostępowe
NGA
zużycie energii
ochrona środowiska
broadband access networks
energy consumption
environment protection
greenhouse gas emissions
Opis:: Artykuł prezentuje analizę zużycia energii elektrycznej przez własne urządzenia abonenta przyłączane do szerokopasmowej sieci dostępowej nowej generacji oraz jego konsekwencje dla systemu energetycznego i środowiska naturalnego. Dostęp do usług oferowanych przez sieć szerokopasmową motywuje abonenta do wyposażenia gospodarstwa domowego w nowe urządzenia elektroniczne jak komputery i odbiorniki telewizyjne HD oraz bardziej intensywnej eksploatacji już posiadanych, prowadząc do wzrostu zużycia energii elektrycznej. Problem ten jest zwykle pomijany w literaturze, gdzie dominują analizy ograniczone do zużycia energii w samej sieci telekomunikacyjnej, tworzące złudny niestety obraz "zielonej" technologii. Przedstawiono też analizę ekonomiczną skutków pokrycia kraju siecią szerokopasmową.
The paper presents an analysis of energy consumption by electronic devices in household with access to fast broadband, especially NGA, and its consequences for national power system and natural environment. Access to services provided by fast broadband network motivates households to buy new electronics like PCs or net-enabled TV sets, and to use existing devices more intensively, leading to increase of electricity consumption. This issue is omitted in most studies, limited to analysis of power consumption in the network itself, and creating a false picture of broadband as a "green" technology. Additionally, an analysis of direct and indirect economic effects of nationwide NGA deployment in Poland is included.
Źródło:: Telekomunikacja i Techniki Informacyjne; 2012, 1-2; 46-57
1640-1549
1899-8933
Pojawia się w:: Telekomunikacja i Techniki Informacyjne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Światłowodowe sieci dostępowe
Optical fiber access networks
Autorzy:: Borzycki, K.
Powiązania:: https://bibliotekanauki.pl/articles/317584.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: dostęp szerokopasmowy
sieci światłowodowe
sieci dostępowe
włókno światłowodowe
włókno mikrostrukturalne
kabel światłowodowy
FTTH
FTTN
FTTx
DSL
regulacje
konkurencja
broadband access
optical fiber networks
access networks
optical fiber
holey fiber
photonic fiber
optical fiber cable
regulations
competition
Opis:: Wskazano, że szybki wzrost wymagań dotyczących przepływności łączy abonenckich i jakości usług zmusza do budowy nowej infrastruktury dostępowej, przeważnie z wykorzystaniem włókien światłowodowych jako medium transmisyjnego. Przedstawiono czynniki motywujące operatorów do budowy sieci światłowodowych, rozwiązania techniczne sieci, ich klasyfikację oraz problemy związane z zapewnieniem dostępu do sieci operatorom alternatywnym.
The paper highlights that rapidly growing requirements for subscriber access speed and service quality force operators to build a new access infrastructure, preferably based on optical fibers as the transmission medium. A review of factors motivating to build fiber access networks, technical solutions, terminology and problems related to provision of access for competitive operators is presented.
Źródło:: Telekomunikacja i Techniki Informacyjne; 2008, 1-2; 71-99
1640-1549
1899-8933
Pojawia się w:: Telekomunikacja i Techniki Informacyjne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Ubiquity of Client Access in Heterogeneous Access Environment
Autorzy:: Gierłowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/308576.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: handover
mesh networks
mobility
technological networks
ubiquitous access
wireless networks
Opis:: With popularization of mobile computing and diverse offer of mobile devices providing functionality comparable to personal computers, the necessity of providing network access for such users cannot be disputed. The requirement is further reinforced by emergence of general purpose mobile operating systems which provide their full functionality only with network connectivity available and popular XaaS (Everything as a Service) approach. In this situation and combined with the fact that most Internet-based services are able to function efficiently even in best effort environment, requirement of ubiquity of network access becomes one of the most important elements of today’s computing environment. This paper presents a general overview of the the vast group of mechanisms and technologies utilized in modern attempts to efficiently provide ubiquity on network access in heterogeneous environment of today’s access systems. It starts with division of users interested in ubiquitous network access into broad groups of common interest, complete with their basic requirements and access characteristics, followed by a survey of both already popular and new wireless technologies suitable to provide such access. Then a general discussion of most important challenges which must be addressed while attempting to fulfill the above goal is provided, addressing topics such as handover control and mobility management.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 3; 3-16
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Protocols for Wireless Sensor Networks: A Survey
Autorzy:: Kochhar, A.
Kaur, P.
Singh, P.
Sharma, S.
Powiązania:: https://bibliotekanauki.pl/articles/958098.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: cross-layer
Medium Access Control
protocols
Wireless Sensor Networks
Opis:: This paper presents a survey on the MAC and network layer of Wireless Sensor Networks. Performance requirements of the MAC layer are explored. MAC layer protocols for battery-powered networks and energy harvesting-based networks are discussed and compared. A detailed discussion on design constraints and classification of routing protocols is presented. Several routing protocols are compared in terms of such parameters as: energy consumption, scalability, network lifetime and mobility. Problems that require future research are presented. The cross-layer approach for WSNs is also surveyed.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 1; 77-87
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Simulating capture behaviour in 802.11 radio modems
Autorzy:: Ware, C.
Wysocki, T. A.
Chicharo, J.
Powiązania:: https://bibliotekanauki.pl/articles/309552.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: wireless local area networks
ad hoc networks
capture models
medium access control protocol
fairness
Opis:: Simulation plays an important role in the performance evaluation of MAC protocols. Building simulation models which are able to accurately model physical behaviour is fundamental to the outcome of such techniques. Through both qualitative and quantitative comparison of experimental trace data against simulation results obtained using delay, power, and hybrid capture models, this paper investigates the performance of various packet capture models in the simulation analysis of the 802.11 PHY and MAC layer protocols. We illustrate these models are unable to accurately describe the fairness properties of the experimental data. A new model is proposed, Message Retraining, to describe the operation of an 802.11 receiver. We illustrate that the Message Retraining reception model is able to model the fairness characteristics obtained with an IEEE 802.11 radio modem more accurately than the previous capture models.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 3; 46-54
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: How the Role-Based Trust Management Can Be Applied to Wireless Sensor Networks
Autorzy:: Felkner, A.
Powiązania:: https://bibliotekanauki.pl/articles/307588.pdf
Data publikacji:: 2012
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: access control
role-based trust management
trust
wireless sensor networks
Opis:: Trust plays an important role in human life environments. That is why the researchers has been focusing on it for a long time. It allows us to delegate tasks and decisions to an appropriate person. In social sciences trust between humans was studied, but it also was analyzed in economic transactions. A lot of computer scientists from different areas, like security, semantic web, electronic commerce, social networks tried to transfer this concept to their domains. Trust is an essential factor in any kind of network, whether social or computer. Wireless sensor networks (WSN) are characterized by severely constrained resources, they have limited power supplies, low transmission bandwidth, small memory sizes and limited energy, therefore security techniques used in traditional wired networks cannot be adopted directly. Some effort has been expended in this fields, but the concept of trust is defined in slightly different ways by different researchers. In this paper we will show how the family of Role-based Trust management languages (RT) can be used in WSN. RT is used for representing security policies and credentials in decentralized, distributed access control systems. A credential provides information about the privileges of users and the security policies issued by one or more trusted authorities.
Źródło:: Journal of Telecommunications and Information Technology; 2012, 4; 70-77
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Ranking of LTE cells based on key performance indicators using MCDM methods
Autorzy:: Lopes Neto, Pedro Nunes
Freire Junior, José Celso
Tuna, Celso Eduardo
Powiązania:: https://bibliotekanauki.pl/articles/2211970.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Ekonomiczny w Katowicach
Tematy:: long-term evolution
multiple criteria methods
radio access network performance management
self-organizing networks
Opis:: The growth in worldwide data traffic and user subscriptions in mobile telecommunication networks makes it increasingly difficult to manage network performance in an environment already containing multiple radio access technologies. Despite the rise of 5G, LTE remains the dominant technology, and new cells are installed daily to support traffic growth and new services such as voice over LTE. Detecting faulty cells in the network is one of the main concerns of operators. Self organizing networks have been introduced to deal with this problem, and their self healing functionality has improved cell fault management. Nonetheless, faulty cell detection remains challenging, and most of the tasks involved are still done manually. This paper introduces a new method of faulty cell detection in an LTE radio access network, applying multiple criteria methods to this problem. The cells are ranked based on selected key performance indicators, using the multi attribute utility theory to construct a utility function. The analytic hierarchy process is used to define weights for the criteria.
Źródło:: Multiple Criteria Decision Making; 2022, 17; 46-68
2084-1531
Pojawia się w:: Multiple Criteria Decision Making
Dostawca treści:: Biblioteka Nauki

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