Wyniki wyszukiwania - BazTech

1

LTE network performance evaluation: A comparative study of planned and deployed networks

Krasniqi Bujar, Bojku Margarite, Prebreza Bahri

Przegląd Elektrotechniczny

|

2023

|

R. 99, nr 10

30--33

EN

This paper examines the comparison between the measured values and the defined interval for the selected parameters shows that they are within the acceptable range. However, differences in coverage are observed when comparing Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal to Interference-Noise Ratio (SINR), and throughput, mainly due to weaker resolution maps and changes in the infrastructure that have been continuously happening in that part of Prishtina.

PL

Ten artykuł analizuje porównanie między wartościami zmierzonymi a zdefiniowanym przedziałem dla wybranych parametrów, co pokazuje, że mieszczą się one w akceptowalnym zakresie. Jednakże zaobserwowano różnice w pokryciu podczas porównywania Mocy Odebranego Sygnału Referencyjnego (RSRP), Jakości Odebranego Sygnału Referencyjnego (RSRQ), Stosunku Sygnału do Zaburzeń i Szumów (SINR) oraz przepustowości, głównie z powodu słabszych map rozdzielczości oraz zmian w infrastrukturze, które ciągle mają miejsce w tej części Prisztiny.

2

Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes

Salah Ibrahim, Rahouma Kamel Hussein, Hussein Aziza I., Mabrook M. Mourad

International Journal of Electronics and Telecommunications

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2023

|

Vol. 69, No. 1

185--191

EN

On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).

3

Pragmatic Distribution Based Routing Cluster to Improve Energy Efficient Cluster lifetime for Wireless Sensor Networks

SV Harish, NV Archan

International Journal of Electronics and Telecommunications

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2023

|

Vol. 69, No. 2

353--360

EN

Energy consumed by the sensor nodes are more sporadic in a sensor networks. A skilled way to bring down energy consumption and extend maximum life-time of any sensor present can be of evenly and unevenly distributed random area networks. Cluster heads are more responsible for the links between the source and destination. Energy consumption are much compare to member nodes of the network. Re-clustering will take place if the connectivity in the distributed network failure occurs in between the cluster networks that will affects redundancy in the network efficiency. Hence, we propose pragmatic distribution based routing cluster lifetime using fitness function (PDBRC) prototype is better than the existing protocol using MATLAB 2021a simulation tool.

4

Assessment of iPerf as a Tool for LAN Throughput Prediction

Zieliński Bartłomiej

International Journal of Electronics and Telecommunications

|

2023

|

Vol. 69, No. 3

523--528

EN

This article discusses whether iPerf can be used as an effective tool for wired and wireless LAN throughput estimation. The potential advantages of using iPerf in comparison to FTP are discussed. Finally, the article presents the throughput measurement results obtained with FTP, iPerf2 and iPerf3 in a simple experimental network.

5

Maximising performance of a hospital’s HBOT laboratory using the theory of constraints

Kosieradzka Anna, Węgrzyk Jacek, Smętek Wojciech, Strzelec Przemysław

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

|

2022

|

z. 155

187--208

EN

Purpose: The paper presents an application of the Theory of Constraints (TOC) aimed at defining and maximising the potential of hyperbaric chamber as a key resource in a specialist hospital. Design/methodology/approach: The authors developed their own TOC based method of process improvement, supported by tools of Lean Management. Various constraints including an external one were taken into consideration. As a follow-up a project using the method was carried out in a hospital’s Hyperbaric Oxygen Therapy laboratory. Findings: The developed and implemented practical solution has improved patients’ access to the service at about 40% per day, shortened patients’ waiting time at about 90% and helped to overcome the threat of financial underperformance. Moreover, in combination with strict safety rules, the solution has proven its high resistance against difficulties caused by the COVID-19 pandemic. Research limitations/implications: A hyperbaric therapy is a narrow branch of medicine, therefore application of the method in other healthcare domains will require an appropriate adaptation. Practical implications: Despite the narrow subject of the study, the described approach is universal and can be used to maximise the capacity utilisation of various critical resources in hospitals and other healthcare providers. Originality/value: This is the first known to the authors application of a TOC/Lean based systematic hybrid approach to improve performance of a healthcare provider, which is taking into account several constraints including an external one. Additionally, this is the first paper on TOC in healthcare published in Poland.

6

LAN performance evaluation based on access to transmission media

Wibowo Sastya Hendri, Toyib Rozali, Danita Yuli, Muntahanah

Przegląd Elektrotechniczny

|

2022

|

R. 98, nr 10

80--85

EN

Local Area Network as a computer network on small scale. The limited distance between a room, building, or office. The factor of LAN is performance, where the performance can do by using availability, reliability, response time, and throughput. Its function of it is to know the performance of LAN. Availability, use to measure the time of the network. It’s working at all work of the network it is called MTBF and MTTR. Reliability, use to measure the time of the network, which is work to transmit the data and avoid data from errors. Response time, use to measure the time that needs by the data to begin from the computer transmission. The process does in host and time. It’s needed to give back the data to the sender. Throughput, use to measure the total data that it’s transmitted at a certain time.

PL

Sieć lokalna jako sieć komputerowa na małą skalę. Ograniczona odległość między pokojem, budynkiem lub biurem. Czynnikiem sieci LAN jest wydajność, gdzie wydajność może być realizowana przy wykorzystaniu dostępności, niezawodności, czasu odpowiedzi i przepustowości. Jego funkcją jest poznanie wydajności sieci LAN. Dostępność, użyj do pomiaru czasu sieci. Działa przy wszystkich pracach sieci o nazwie MTBF i MTTR. Niezawodność, służy do mierzenia czasu sieci, czyli pracy nad przesyłaniem danych i unikaniem błędów danych. Czas odpowiedzi służy do pomiaru czasu potrzebnego na rozpoczęcie transmisji danych przez komputer. Proces odbywa się w gospodarzu i czasie. Jest potrzebny do oddania danych nadawcy. Przepustowość służy do pomiaru całkowitej ilości danych przesyłanych w określonym czasie.

7

A cryptographic security mechanism for dynamic groups for public cloud environments

Malviya Sheenal, Dave Sourabh, Bandhu Kailash Chandra, Litoriya Ratnesh

Journal of Automation Mobile Robotics and Intelligent Systems

|

2022

|

Vol. 16, No. 2

46--54

EN

Cloud computing has emerged as a significant technology domain, primarily due to the emergence of big data, machine learning, and quantum computing applications. While earlier, cloud computing services were focused mainly on providing storage and some infrastructures/ platforms for applications, the need to advance computational power analysis of massive datasets. It has made cloud computing almost inevitable from most client-based applications, mobile applications, or web applications. The allied challenge to protect data shared from and to cloud-based platforms has cropped up with the necessity to access public clouds. While conventional cryptographic algorithms have been used for securing and authenticating cloud data, advancements in cryptanalysis and access to faster computation have led to possible threats to the traditional security of cloud mechanisms. This has led to extensive research in homomorphic encryption pertaining to cloud security. In this paper, a security mechanism is designed targeted towards dynamic groups using public clouds. Cloud security mechanisms generally face a significant challenge in terms of overhead, throughput, and execution time to encrypt data from dynamic groups with frequent member addition and removal. A two-stage homomorphic encryption process is proposed for data security in this paper. The performance of the proposed system is evaluated in terms of the salient cryptographic metrics, which are the avalanche effect, throughput, and execution time. A comparative analysis with conventional cryptographic algorithms shows that the proposed system outperforms them regarding the cryptographic performance metrics.

8

Methods of hydrodynamic calculation oil pipeline sequential transportation of small batches of various oil

Serediuk M.D.

Archives of Materials Science and Engineering

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2022

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Vol. 117, nr 1

25--33

EN

Purpose: To improve the technologies of different oil types of sequential pumping through the pipeline by establishing the laws of changing the throughput and energy efficiency of the oil pipeline operator in the process of pumping and displacing oil batches. The identified regularities would contribute to more effective management of the mixture realisation process at the end of the oil pipeline and reliable forecasting of the results of the different oil types of mixture formation. Design/methodology/approach: Carrying out theoretical studies and applying mathematical modelling methods in order to establish the regularities of hy-drodynamic processes during the injection into the oil pipeline and the displacement of oil different grades from it. Findings: The regularities of changes in oil pipeline capacity and specific electricity costs for transportation as a function of the coordinates of different oil types of batches contacts and the time of sequential pumping cycle implementation they have been established. Research limitations/implications: The next stage of the research is to establish the influence of the hydrodynamic processes features on the intensity of the oil different grades mixture formation in the process of their successive pumping in the oil pipeline. Practical implications: A method and software have been developed that make it possible to predict the throughput and energy efficiency of oil pipeline operation for each moment of the sequential pumping cycle of small batches of different grade oil. The application of the method for the conditions of an operating oil pipeline proved that during the cycle of four types of sequential oil pumping, the change in throughput exceeds 20%, and the change in energy consumption exceeds 10%. Originality/value: The originality of the method consists in taking into account the regularities of the hydrodynamic process of the movement of several batches of oil of different grades in the pipeline, the features of the profile of the pipeline route and the physical properties of the liquid that fills the cavity of the pumps.

9

Jantakun analysis of throughput in narrowband cognitive radio networks over fading channels: a collaborative spectrum sensing approach

Alam Sk. Shariful, Mallick Shishir

Przegląd Elektrotechniczny

|

2021

|

R. 97, nr 8

104--108

EN

Spectrum is a valuable resource for wireless communication technologies. Recent studies show that the scarcity of spectrum generates dominant interest for research in wireless communications. As spectrum is a natural resource, the only alternative to meet up spectrum inefficiency is to exploit the unutilized or underutilized spectrum accurately using the concept of Cognitive Radios (CRs). Cooperation among the CR nodes provide the best sensing performance utilizing maximum accuracy compared to other sensing approaches. Hence, maximum throughput is guaranteed with reliable data transmission. In this research article, the sensing-throughput trade-off issues are analysed for both stand-alone and cooperative cases. We use an energy detection scheme to measure the detection performances due to its operational simplicity and low-cost in use. The attemptable throughput of the cooperative CR network (CRN) is maximized while the services to licensed users are not being hampered. The more the CR nodes are in cooperation, the higher the detection performance which consecutively enriches throughput. The achievements of attainable throughput are supported under Rayleigh and Rician fading channels.

PL

Widmo to cenne źródło technologii komunikacji bezprzewodowej. Ostatnie badania pokazują, że niedobór widma generuje dominujące zainteresowanie badaniami nad komunikacją bezprzewodową. Ponieważ widmo jest zasobem naturalnym, jedyną alternatywą dla zaradzenia nieefektywności widma jest dokładne wykorzystanie niewykorzystanego widma przy użyciu koncepcji radia kognitywnego (CR). Współpraca między węzłami CR zapewnia najlepszą wydajność wykrywania przy maksymalnej dokładności w porównaniu z innymi podejściami wykrywania. Dzięki temu maksymalna przepustowość jest gwarantowana przy niezawodnej transmisji danych. W tym artykule przeanalizowano kwestie kompromisu między czujnikami a przepustowością zarówno dla przypadków samodzielnych, jak i kooperacyjnych. Używamy schematu wykrywania energii do pomiaru wydajności wykrywania ze względu na jego prostotę operacyjną i niski koszt użytkowania. Przepustowość kooperacyjnej sieci CR (CRN) jest maksymalizowana, podczas gdy usługi dla licencjonowanych użytkowników nie są utrudnione. Im bardziej węzły CR współpracują, tym wyższa wydajność wykrywania, co sukcesywnie zwiększa przepustowość. Osiągnięcia osiągalnej przepustowości są obsługiwane przez kanały zanikania Rayleigh.

10

Analysis of The Effectiveness of Online Electronic Learning System Using Data Traffic Network Performance Management to Succeed Merdeka Learning : Merdeka Campus During the Covid-19 Pandemic

Budiyanto Setiyo, Silalahi Lukman Medriavin, Silaban Freddy Artadima, Sitorus Henry Binsar Hamonangan, Rochendi Agus Dendi, Ismail Mochamad Furqon

International Journal of Electronics and Telecommunications

|

2021

|

Vol. 67, No. 4

595--601

EN

The problems in the Covid-19 pandemic have a major influence on the field of education with the use of technology to support the teaching and learning process to facilitate students who do home learning activities. The proposed concept of freedom of learning is a more comprehensive concept such as portfolio and assignments such as group assignments, writings, and so on that are done in full online by adding additional features such as Teaching and Learning Activities and Assessment through information technology media. (E-Learning / Learning Management System). The method proposed in this research is the Peer Connection Queue (PCQ) method on mikrotik operating systems. PCQ method is a program to manage network traffic in Quality of Services (QoS). Bandwidth management methods. The hypothesis formulated is to create bandwidth management with PCQ so that bandwidth sharing is automatically and evenly distributed to multi clients. Therefore, in this research finally formulated into the goal of E-Learning effectiveness analysis using bandwidth management analysis method, which will be measured and analyzed in this research is throughput, delay, jitter, and packet loss. So that the final result of this research obtained the feasibility of the teaching and learning process that is carried out effectively.

11

An Innovative Multiple Attribute Based Distributed Clustering with Sleep/Wake Scheduling Mechanism for WSN

Chavan Shankar D., Jagdale Shahaji R., Kulkarni Dhanashree A., Jadhav Sneha R.

International Journal of Electronics and Telecommunications

|

2021

|

Vol. 67, No. 3

437--443

EN

Wireless sensor network is a dynamic field of networking and communication because of its increasing demand in critical Industrial and Robotics applications. Clustering is the technique mainly used in the WSN to deal with large load density for efficient energy conservation. Formation of number of duplicate clusters in the clustering algorithm decreases the throughput and network lifetime of WSN. To deal with this problem, advance distributive energy-efficient adaptive clustering protocol with sleep/wake scheduling algorithm (DEACP-S/W) for the selection of optimal cluster head is presented in this paper. The presented sleep/wake cluster head scheduling along with distributive adaptive clustering protocol helps in reducing the transmission delay by properly balancing of load among nodes. The performance of algorithm is evaluated on the basis of network lifetime, throughput, average residual energy, packet delivered to the base station (BS) and CH of nodes. The results are compared with standard LEACH and DEACP protocols and it is observed that the proposed protocol performs better than existing algorithms. Throughput is improved by 8.1% over LEACH and by 2.7% over DEACP. Average residual energy is increased by 6.4% over LEACH and by 4% over DEACP. Also, the network is operable for nearly 33% more rounds compared to these reference algorithms which ultimately results in increasing lifetime of the Wireless Sensor Network.

12

Investigation of influence of parameters of the digital telecommunication system on its efficiency

Bobalo Yuriy, Horbatyi Ivan, Kiselychnyk Myroslav

Przegląd Elektrotechniczny

|

2019

|

R. 95, nr 9

62--66

EN

The influence of parameters of the digital telecommunication system or telecommunication network on their technical efficiency is investigated. For example, the technical efficiency of a telecommunication network based on WiMAX technology IEEE 802.16e is investigated.

PL

W artykule analizowano wpływ parametrów cyfrowego systemu telekomunikacyjnego efektywność. Analizę przeprowadzono na przykładzie sieci WIFIMAX IEEE 802.16e.

13

Next Generation Dynamic Inter-Cellular Scheduler

Yağcıoğlu Mert, Bayat Oğuz

International Journal of Electronics and Telecommunications

|

2019

|

Vol. 65, No. 3

441--448

EN

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.

14

Analiza porównawcza symulacyjnych metod oceny wydajności sieci 5G wykorzystującej anteny kierunkowe ze sterowaną wiązką

Bechta K., Rybakowski M.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2018

|

nr 6

308--311, CD

PL

W porównaniu do obecnie wykorzystywanych systemów komunikacji mobilnej, gdzie stacja bazowa jak i urządzenie końcowe wykorzystują anteny dookólne bądź sektorowe, obliczanie budżetu łącza radiowego dla systemu 5G wykorzystującego anteny kierunkowe wymaga bardziej złożonego modelowania symulacyjnego. W szczególności w zakresie fal milimetrowych, gdzie system 5G zakłada użycie anten o bardzo wąskich wiązkach, tradycyjne obliczanie tłumienia kanału na podstawie modelu zoptymalizowanego dla anten dookólnych i bez uwzględnienia efektu filtrowania przestrzennego lub wpływu rozmycia kątowego spowodowanego propagacją wielodrogową prowadzi do błędów w obliczeniach budżetu łącza radiowego.

EN

In comparison to legacy mobile communication systems, where access point and user device are equipped with omnidirectional or sectoral antennas, calculation of link budget for 5G system, which employs directional antennas, requires more comprehensive modelling in system level simulations. Especially in case of mmWave range, where narrow- beam antennas are used, simple calculation of omni-directional path loss between transmitter and receiver without modeling of spatial filtering or angular spread impact due to multipath propagation, leads to noticeable miscalculations.

15

Hard coal and international seaborne trade

Stala-Szlugaj K., Grudziński Z.

Polityka Energetyczna

|

2018

|

T. 21, z. 3

31--46

EN

A significant part of hard coal production (15–19% in the years 2010–2017, i.e. 1.0–1.3 billion tons per year) is traded on the international market. The majority of coal trade takes place by sea, accounting for 91–94% of the total coal trade. The article discusses the share of coal in international seaborne trade and the largest coal ports. Coal is one the five major bulk commodities (in addition to iron ore, grain, bauxite, alumina, and phosphate rock). In the years 2010–2016, the share of coal in international seaborne trade and major bulk commodities was 36–41% and 11–12%, respectively. Based on the analysis of coal throughput in different ports worldwide, the ports with the largest throughput include the ports of Qinhuangdao (China), Newcastle (Australia), and Richards Bay (South Africa). For 2013–2017, their throughput amounted to a total of 411–476 million tons of coal. The largest coal exporting countries were: Australia, Indonesia, Russia, Colombia, South Africa, and the US (a total of 85% share in global coal exports), while the largest importers are Asian countries: China, India, Japan, South Korea and Taiwan (a 64% share in global imports). In Europe, Germany is the largest importer of coal (54 million tons imported in 2016). The article also discusses the freight costs and the bulk carrier fleet. Taking the price of coal at the recipient’s (i.e. at the importer’s port) into account, the share of freight costs in the CIF price of steam coal (the price of a good delivered at the frontier of the importing country) was at the level of 10–14%. In the years 2010–2016, the share of bulk carriers in the world fleet was in the range of 11–15%. In terms of tonnage, bulk carriers accounted for 31–35% of the total tonnage of all types of ships in the world. The share of new (1–4 years) bulk carriers in the total number of ships on a global scale in the years 2010–2016 was 29–46%.

PL

Międzynarodowy rynek węgla kamiennego stanowi fragment jego światowej produkcji (15–19% w latach 2010–2017, tj. 1,0–1,3 mld ton/rok). Główna część międzynarodowych obrotów węgla realizowana jest drogą morską stanowiąc 91–94% ogólnych obrotów handlowych tym surowcem. W artykule skupiono się na omówieniu udziału węgla w światowych morskich przewozach ładunkowych, jak również głównych węglowych portów morskich. Węgiel stanowi jeden z pięciu głównych ładunków masowych suchych wyszczególnianych w statystykach morskich (obok rudy żelaza, zbóż, boksytów i aluminium oraz fosforytów). W latach 2010–2016 udział węgla w strukturze morskich przewozów ładunków w skali globalnej wynosił 36–41%, a w strukturze pięciu głównych ładunków suchych – 11–12%. Z analizy przeładunków węgla w różnych morskich portach świata wynika, że pod względem tonażowym największe przeładunki realizowane są w portach: Qinhuangdao (Chiny), Newcastle (Australia) i Richards Bay (RPA). W latach 2013–2017 przeładunki te rocznie wynosiły w sumie 411–476 mln ton węgla. Największymi eksporterami węgla na świecie są państwa: Australia, Indonezja, Rosja, Kolumbia, RPA i USA (łącznie 85% udziału w globalnym eksporcie węgla), a największymi importerami są głównie kraje azjatyckie: Chiny, Indie, Japonia, Korea Płd. i Tajwan (64% udziału w światowym imporcie). W przypadku Europy największym importerem węgla są Niemcy (w 2016 r. importowały 54 mln ton). W artykule omówiono także koszty frachtu morskiego oraz flotę masowców. Biorąc pod uwagę cenę węgla u odbiorcy (czyli w porcie importera), udział kosztów frachtów w cenie węgla u odbiorcy w ostatnich latach kształtował się średnio na poziomie 10–14%. W latach 2010–2016 udział masowców w światowej flocie zawierał się w przedziale 11–15%, a pod względem tonażowym masowce stanowiły 31–35% (łącznego tonażu wszystkich rodzajów statków na świecie). Udział masowców najmłodszych (1–4-letnich) w ogólnej liczbie statków w skali globalnej w latach 2010–2016 wynosił 29–46%.

16

Sequentially Distributed Coalition Formation Game for Throughput Maximization in C-RANs

Gbenga-Ilori A., Sanusi O.

International Journal of Electronics and Telecommunications

|

2018

|

Vol. 64, No. 4

505--512

EN

Cloud radio access network (C-RAN) has been proposed as a solution to reducing the huge cost of network upgrade while providing the spectral and energy efficiency needed for the new generation cellular networks. In order to reduce the interference that occur in C-RAN and maximize throughput, this paper proposes a sequentially distributed coalition formation (SDCF) game in which players, in this case the remote radio heads (RRHs), can sequentially join multiple coalitions to maximize their throughput. Contrary to overlapping coalition formation (OCF) game where players contribute fractions of their limited resources to different coalitions, the SDCF game offers better stability by allowing sequential coalition formation depending on the availability of resources and therefore providing a balance between efficient spectrum use and interference management. An algorithm for the proposed model is developed based on the merge-only method. The performance of the proposed algorithm in terms of stability, complexity and convergence to final coalition structure is also investigated. Simulation results show that the proposed SDCF game did not only maximize the throughput in the C-RAN, but it also shows better performances and larger capabilities to manage interference with increasing number of RRHs compared to existing methods.

17

QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs

Rao D. S., Hency V. D. B.

Journal of Telecommunications and Information Technology

|

2017

|

nr 4

17--24

EN

The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.

18

Optimization of Spectrum Sensing Parameters in Cognitive Radio Using Adaptive Genetic Algorithm

Chatterjee S., Dutta S., Bhattacharya P. P., Roy J. S.

Journal of Telecommunications and Information Technology

|

2017

|

nr 1

21--27

EN

Quality of service parameters of cognitive radio, like, bandwidth, throughput and spectral efficiency are optimized using adaptive and demand based genetic algorithm. Simulation results show that the proposed method gives better real life solution to the cognitive radio network than other known approach.

19

Performance Enhancement Heterogeneous Based EECP for Bandwidth Utilization

Kaur Gagandeep, Mishra Vinod Kumar

Annals of Computer Science and Information Systems

|

2017

|

Vol. 10

207--215

EN

Using the increase of user made on distributed network scheme, traffic congestion is one of the necessary circumstances. Distributed network consists of various networks, processors and intermediary strategies that overwork the changes or routers with high traffic and it is because of the project fault in the circulated networking architecture. Even though several researchers address the congestion recognition method, its avoidance and modification in their investigation are solid to be explored for any effective solution for this problem. Due to huge network congestion user will face the network speed problem, real congestion control methods are desirable, and mainly to solve``bursty'' transportation of today's for actual extraordinary speed networks. Subsequently dawn 90's many systems have been proposed. This paper concentrates on heterogeneity based congestion mechanism patterns on the basis of certain key performance metrics. Mainly in this work we will judge the performance of Delay, congestion rate, throughput and channel capacity EECP based solution for a steady state against these key performance metrics.

20

A Survey on Mac Protocols for Wireless Sensor Networks

Anubhama R., Rajendran T.

Annals of Computer Science and Information Systems

|

2017

|

Vol. 10

121--126

EN

Wireless Sensor Network (WSN) is an infrastructure-less wireless network of nodes that can sense the environment or physical conditions and relay the data to a sink or a gateway possibly through multiple hops. The primary task of Medium Access Control (MAC) protocols in such a network is to synchronize the task of data communication between the nodes with energy efficiency being the prime consideration due to power constraints in sensor nodes. So the most significant performance specifications for MAC protocols in WSN are throughput, efficiency, stability, fairness, low access delay, low transmission delay and low overhead. In this paper we have surveyed significant classes of MAC protocols used in WSN and reviewed the merits and demerits of those protocols based on the aforementioned specifications.