Temat: QOS - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Possibilities to Optimize QoS with Next SON Versions
Autorzy:: Langer, M.
Powiązania:: https://bibliotekanauki.pl/articles/309116.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: 4G
QoS
SON
Opis:: The paper discusses quality of service in LTE and LTE-A networks seen as a challenge that can be met with Self-Organizing Networks (SON) functionalities. The SON concepts have been included in the LTE (E-UTRAN) standards since the first release of the LTE technology. Self-optimization functionalities will monitor and analyze performance measurements, notifications, and self-test results and will automatically trigger re-configuration actions on the affected network nodes when necessary. The SON specifications have been built over the existing 3GPP network management architecture, the ultimate implementation of SON in 4G networks will bring many advantages. Successive SON procedures are waiting for their time and money to be implemented in 4G, though some essential issues for example of inter Radio Access Technology (RAT) interfaces must be overworked.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 1; 27-31
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:: AQUILA network architecture: first trial experiments
Autorzy:: Bąk, A.
Bęben, A.
Burakowski, W.
Dąbrowski, M.
Fudała, M.
Tarasiuk, H.
Kopertowski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309191.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: IP QoS
pomiary
measurements
Opis:: The paper presents trial experiments with IP QoS network services (NS) defined and implemented in the AQUILA pilot installation. The AQUILA NSs (premium CBR, premium VBR, premium multimedia and premium mission critical) provide a framework for supporting a variety of applications generating both streaming and elastic traffic. The measurement experiments confirm that AQUILA architecture differentiates the QoS offered to these NSs. The presented numerical results were obtained in the test network installed in the Polish Telecom (Warsaw) consisting of 8 CISCO routers.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 3-13
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:: Fuzzy Clustering with Multi-Constraint QoS Service Routing in Wireless Sensor Networks
Autorzy:: Agarkhed, Jayashree
Kadrolli, Vijayalaxmi
Patil, Siddarama R.
Powiązania:: https://bibliotekanauki.pl/articles/307716.pdf
Data publikacji:: 2019
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: fuzzy logic
QoS
routing
WSN
Opis:: This paper presents a fuzzy logic-based, service diﬀerentiated, QoS aware routing protocol (FMSR) oﬀering multipath routing for WSNs, with the purpose of providing a service diﬀerentiated path meant for communication between nodes, based on actual requirements. The proposed protocol initially forms a cluster by fuzzy c-means. Next, the building of a routing follows, so as to establish multiple paths between nodes through the modiﬁed QoS k-nearest neighborhood, based on diﬀerent QoS constraints and on optimum shortest paths. If one node in the path fails due to lack of residual energy, bandwidth, packet loss, delay, an alternate path leading through another neighborhood node is selected for communication. Simulation results show that the proposed protocol performs better in terms of packet delivery ratio, delay, packet drop ratio and throughput compared to other existing routing protocols.
Źródło:: Journal of Telecommunications and Information Technology; 2019, 1; 31-38
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The EDCA Implementation in NS-3 Network Simulator
Implementacja metody EDCA w symulatorze sieciowym NS-3
Autorzy:: Dolińska, Iwona
Powiązania:: https://bibliotekanauki.pl/articles/509044.pdf
Data publikacji:: 2018
Wydawca:: Akademia Finansów i Biznesu Vistula
Tematy:: EDCA
QoS in WLAN
network simulator
NS-3
QoS w sieciach WLAN
symulator sieciowy
Opis:: Wireless networks built in the IEEE 802.11 standard are very popular in every environment now. Their widespread use causes many problems with throughput, transmission QoS and even with radio channel access. IEEE 802.11 standard is still improved, increasing network throughput and coverage, transmission security, mesh networks, wireless access for the vehicular environment, improvements related to hotspots, wireless network management etc. IEEE 802.11e is an important amendment, because it introduced the possibility of QoS (Quality of Service) providing in wireless network. Because of high communication demands and, on the other hand, because the wireless communication is very complex process, the network simulators are very useful tools. They give the possibility of making communication efficiency analyses and different scenario testing. In this article, the implementation of EDCA method in NS-3 is analyzed. It turned out, that nowadays the implementation is missing of one important feature. So, the EDCA implementation in NS-3 should be improved.
Sieci bezprzewodowe budowane w standardzie IEEE 802.11 zyskały ogromną popularność. Ich powszechność powoduje jednak problemy z uzyskaniem odpowiedniej przepustowości, jakości transmisji, a nawet dostępu do kanału radiowego. Standard IEEE 802.11 jest stale ulepszany. Zwiększane były zasięg i przepustowość, dodano zabezpieczenia transmisji, sieci typu mesh, poprawiono mechanizmy zarządzania itd. Rozszerzenie IEEE 802.11e wprowadziło możliwość zapewnienia jakości transmisji QoS w sieciach bezprzewodowych. Z powodu wysokich wymagań użytkowych z jednej strony i złożoności procesu komunikacyjnego z drugiej, bardzo wygodnymi narzędziami do badania sieci są symulatory. Umożliwiają one analizowanie efektywności komunikacji i testowanie różnych scenariuszy połączeń. W niniejszym artykule przeprowadzono analizę implementacji metody EDCA w symulatorze sieciowym NS-3. Wykazała ona, że implementacja EDCA nie obejmuje jednej ważnej właściwości tej metody, a więc powinna być poprawiona.
Źródło:: Zeszyty Naukowe Uczelni Vistula; 2018, 59(2) Informatyka; 19-29
2353-2688
Pojawia się w:: Zeszyty Naukowe Uczelni Vistula
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: On effectiveness of conditional admission control for IP QoS network services with REM scheme
Autorzy:: Dąbrowski, M.
Burakowski, W.
Bęben, A.
Powiązania:: https://bibliotekanauki.pl/articles/309267.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: QoS IP network
conditional admission control
Opis:: Future IP QoS (quality of service) networks are aiming at differentiating transfer quality of packets belonging to different flows. For this purpose, a set of network services (NS) with different QoS objectives is defined and implemented in the network. To a NS a certain amount of network resources, i.e. dedicated link capacity with associated buffer size, is allocated. Moreover, the resources dedicated for one NS are not available for other NSs. Traditional approach for admission control algorithm corresponding to given NS takes into account current traffic conditions inside considered NS. This can lead to the situation, due to traffic fluctuations, that temporary overloaded NS cannot use the spare bandwidth from underloaded in this time other NSs. This paper describes a conditional admission control algorithm (C-AC), allowing us to admit new packet flow conditionally in the case where no available capacity inside a given NS. For conditionally accepted flow currently unused capacity, dedicated to other NS, is allocated. This can be done only in the case when QoS requirements for both the conditionally accepted flow and the flows in progress are satisfied. The conditions for effective using of C-AC algorithm are discussed in the paper, like characteristics of NS borrowing and lending capacity and their current traffic load. To show potential benefits of the approach, exemplary numerical results are included, corresponding to hypothetical NSs using REM (rate envelope multiplexing) scheme.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 33-39
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: On Dimensioning and Routing in the IP QoS System
Autorzy:: Góralski, W.
Pyda, P.
Dalecki, T.
Mongay Batalla, J.
Śliwiński, J.
Latoszek, W.
Gut, H.
Powiązania:: https://bibliotekanauki.pl/articles/307866.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: IP QoS System
resource dimensioning
routing
Opis:: This article presents dimensioning and routing solutions in IP QoS System designed during the implementation of the PBZ project: "Next Generation Services and Networks - technical, application and market aspects: Traffic management - IP QoS System". The paper presents the functional architecture together to the description of the functions and methods implemented in the system.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 21-28
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:: Simple admission control procedure for QoS packet switched military networks
Autorzy:: Duda, D.
Burakowski, W.
Powiązania:: https://bibliotekanauki.pl/articles/308006.pdf
Data publikacji:: 2006
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: QoS
admission control
measurement based AC
Opis:: Providing quality of service (QoS) into the networks based on the packet switched technologies, as ATM and IP, is currently the challenge for the military communication system designers. The main element for achieving QoS capabilities is to implement effective admission control (AC) function, which regulates the volume of submitted traffic to the network. The traditional approach for the AC is that it is invoked by each call requesting QoS. As a consequence, the call set-up latency is increasing and, in addition, the signaling traffic in the network is growing. This paper proposes a simple AC method that is based on the online traffic load measurements and assumes that the AC is involved only when the load exceeds a predefined threshold. As a consequence, for most of the connections the AC is not necessary to be executed and this causes lower set-up phase duration and limits the volume of signaling traffic. The numerical results showing effectiveness of the approach are included and compared with traditional AC performing.
Źródło:: Journal of Telecommunications and Information Technology; 2006, 3; 38-42
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:: Analysis of bandwidth reservation algorithms in HIPERLAN/2
Autorzy:: Woźniak, J.
Janczak, T.
Machan, P.
Neubauer, W.
Powiązania:: https://bibliotekanauki.pl/articles/308243.pdf
Data publikacji:: 2004
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: HIPERLAN/2
MAC
bandwidth allocation
QoS
Opis:: This paper focuses on performance of channel access methods in the HIPERLAN/2 standard. It discusses commonly used approaches to bandwidth allocation and presents a modified algorithm for effective bandwidth management based on pre-scheduled resource grants. Simulation results show that the new algorithm ensures much higher throughput compared to the standard method.
Źródło:: Journal of Telecommunications and Information Technology; 2004, 2; 54-60
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:: QoS Extensions for Flow-Awareness Networks
Autorzy:: Kaczmarek, Sylwester
Wolff, Maciej
Powiązania:: https://bibliotekanauki.pl/articles/2074139.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FSA
flow network
QoS
MBAC
simulation
Opis:: The paper contains a description and research results of the proposal for distributed QoS extensions for Flow-Based Networking. These QoS extensions let the network accept or reject flows based on current network load and QoS promises for each of the flows. Proposed solution consists of two distributed components, each of them performing in every node, measurement system and access control. The solution could be applied in any network architecture that is able to distinguish flows and routers in this architecture contains flow state table. Proposed approach was verified by simulation, in FSA architecture. Verification was done for six different network structures servicing two traffic classes (MRS, ARS). The results of the simulation tests have confirmed that the average time delay and packet loss ratio in the network with proposed extensions are below thresholds and meet the requirements recommended by ITU-T.
Źródło:: International Journal of Electronics and Telecommunications; 2022, 68, 2; 351--357
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Resource storage management model for ensuring quality of service in the cloud archive systems
Autorzy:: Kapanowski, M.
Słota, R.
Kitowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/305517.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: storage
backup
cloud
management
QoS
SLA
Opis:: Nowadays, service providers offer a lot of IT services in the public or private cloud. Clients can buy various kinds of services, such as SaaS, PaaS, etc. Recently, Backup as a Service (BaaS), a variety of SaaS, was introduced there. At the moment, there are several different BaaS’s available to archive data in the cloud, but they provide only a basic level of service quality. In this paper, we propose a model which ensures QoS for BaaS and some methods for management of storage resources aimed at achieving the required SLA.This model introduces a set of parameters responsible for an SLA level which can be offered at the basic or higher level of quality. The storage systems (typically HSM), which are distributed between several Data Centers, are built based on disk arrays, VTL’s, and tape libraries. The RSMM model does not assume bandwidth reservation or control, but rather is focused on management of storage resources.
Źródło:: Computer Science; 2014, 15 (1); 3-18
1508-2806
2300-7036
Pojawia się w:: Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Video Streaming over IP using the DASH Technique
Autorzy:: Hoppe, C.
Uhl, T.
Powiązania:: https://bibliotekanauki.pl/articles/308880.pdf
Data publikacji:: 2018
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: H.265
IP network technology
MPEG-DASH
QoS measurement techniques
QoS measurement environment
video streaming
VP9
Opis:: Modern Internet serves as a high-performance platform for an ever-increasing number of services. Some of them – video services in particular – are of the broadband variety. So, it is not surprising that segments of networks can rapidly become congested, which may lead to a deterioration in quality. It is hoped that the new MPEG-DASH technique will alleviate congestion. This paper contains an analysis of the new technology’s impact on the quality of service in IP networks. It also explains a new numerical tool QoSCalc(DASH) that has been used to analyze the DASH method in different scenarios. The results are presented graphically and interpreted.
Źródło:: Journal of Telecommunications and Information Technology; 2018, 2; 3-7
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: The New Metric and the New Software Tool for Determining QoS in the Short Messages Service in Mobile Networks
Autorzy:: Rompf, M.
Uhl, T.
Powiązania:: https://bibliotekanauki.pl/articles/309483.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: communication network
ETSI TS 102-250-2
QoS measurement environment
QoS measurement techniques
queuing model
SMS service
Opis:: With traveling professions and nomadic lifestyles on the increase there is a growing need for comprehensive mobile networking within the Next Generation Network, and the security, reliability and technical independency of the Short Message Service (SMS) is becoming more and more indispensable for business processes. Since competitiveness goes hand-in-hand with this business capability, and methods to determine the quality of this service are becoming equally indispensable. This paper presents possible methods to evaluate the “Completion Rate of SMS” and “End-to-End Delivery Time” and combinations of them (new metric in this paper). A software tool, QoSCalc(SMS), has been developed in collaboration with the authors in order to verify whether service providers are abiding by the Service Level Agreements. The tool has been tested in a real measurement environment and the results are presented graphically here and interpreted.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 2; 3-10
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Modeling of Quality of Experience in No-Reference Model
Autorzy:: Nawała, J.
Janowski, L.
Leszczuk, M.
Powiązania:: https://bibliotekanauki.pl/articles/308352.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: QoE
QoS
OTT
no-reference
quality assessment
Opis:: The key objective of no-reference (NR) visual metrics is to predict the end-user experience concerning remotely delivered video content. Rapidly increasing demand for easily accessible, high quality video material makes it crucial for service providers to test the user experience without the need for comparison with reference material. Nevertheless, the QoE measurement is not enough. The information about the source or error is very important as well. Therefore, the described system is based on calculating numerous different NR indicators, which are combined to provide the overall quality score. In this paper, more quality indicators than are used in the QoE calculation are described, since some of them detect specific errors. Such specific errors are dificult to include in a global QoE model but are important from the operation point of view.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 2; 11-17
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Influence of Self-Similar Traffic Type on Performance of QoS Routing Algorithms
Autorzy:: Czarkowski, M.
Kaczmarek, S.
Wolff, M.
Powiązania:: https://bibliotekanauki.pl/articles/226877.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: self-similar traffic
QoS routing
performance
simulation
Opis:: Providing a Quality of Services (QoS) into current telecommunication networks based on packet technology is a big challenge nowadays. Network operators have to support a number of new services like voice or video which generate new type of traffic. This traffic serviced with QoS in consequence requires access to appropriate network resources. Additionally, new traffic type is mixed with older one, like best-effort. Analysis of these new and mixed traffic types shows that this traffic is self-similar. Network mechanisms used for delivery of quality of services may depend on traffic type especially from the performance point of view. This paper presents a feasibility study done into the effect of traffic type influence on performance of routing algorithm while the routing algorithm is treated as one of the mechanisms to support QoS in the network.
Źródło:: International Journal of Electronics and Telecommunications; 2016, 62, 1; 81-87
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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