STABILIZING PERFORMANCE IN NETWORKS OF QUEUES WITH TIME-VARYING ARRIVAL RATES

2014 ◽  
Vol 28 (4) ◽  
pp. 419-449 ◽  
Author(s):  
Yunan Liu ◽  
Ward Whitt
Keyword(s):  
Quality Of Service ◽  
Limit Theorem ◽  
Queueing Networks ◽  
Queueing Network ◽  
Arrival Rate ◽  
Time Varying ◽  
Departure Process ◽  
Feed Forward ◽  
Wide Range

This paper investigates extensions to feed-forward queueing networks of an algorithm to set staffing levels (the number of servers) to stabilize performance % at Quality of Service (QoS) targets in anMt/GI/st+GImulti-server queue with a time-varying arrival rate. The model has a non-homogeneous Poisson process (NHPP), customer abandonment, and non-exponential service and patience distributions. For a single queue, simulation experiments showed that the algorithm successfully stabilizes abandonment probabilities and expected delays over a wide range of Quality-of-Service (QoS) targets. A limit theorem showed that stable performance at fixed QoS targets is achieved asymptotically as the scale increases (by letting the arrival rate grow while holding the service and patience distributions fixed). Here we extend that limit theorem to a feed-forward queueing network. However, these fixed QoS targets provide low QoS as the scale increases. Hence, these limits primarily support the algorithm with a low QoS target. For a high QoS target, effectiveness depends on the NHPP property, but the departure process never is exactly an NHPP. Thus, we investigate when a departure process can be regarded as approximately an NHPP. We show that index of dispersion for counts is effective for determining when a departure process is approximately an NHPP in this setting. In the important common case when all queues have high QoS targets, we show that both: (i) the departure process is approximately an NHPP from this perspective and (ii) the algorithm is effective.

scholarly journals A Lightweight Slice-Based Quality of Service Manager for IoT

IoT ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 49-75
Author(s):  
Antonio Oliveira-Jr ◽  
Kleber Cardoso ◽  
Filipe Sousa ◽  
Waldir Moreira
Keyword(s):  
Quality Of Service ◽  
Industry 4.0 ◽  
Farming Systems ◽  
Smart Manufacturing ◽  
Network Slicing ◽  
Wide Range ◽  
The Internet Of Things ◽  
Service Manager ◽  
Digital Farming

Industry 4.0 and digital farming rely on modern communication and computation technologies such as the Internet of Things (IoT) to provide smart manufacturing and farming systems. Having in mind a scenario with a high number of heterogeneous connected devices, with varying technologies and characteristics, the deployment of Industry 4.0 and digital farming solutions faces innovative challenges in different domains (e.g., communications, security, quality of service). Concepts such as network slicing and Software-Defined Networking (SDN) provide the means for faster, simpler, scalable and flexible solutions in order to serve a wide range of applications with different Quality-of-Service (QoS) requirements. Hence, this paper proposes a lightweight slice-based QoS manager for non-3GPP IoT focusing on different use cases and their varying requirements and characteristics. Our focus in this work is on non-3GPP IoT unlicensed wireless technologies and not specifically the end-to-end network slice perspective as described in 5G standards. We implemented and evaluated different QoS models in distinct scenarios in a real experimental environment in order to illustrate the potential of the proposed solution.

scholarly journals Model-Based Cloud Service Deployment Optimisation Method For Minimisation of Application Service Operational Cost

2021 ◽  
Author(s):  
Ivana Stupar ◽  
Darko Huljenić
Keyword(s):  
Quality Of Service ◽  
Cloud Service ◽  
Operational Cost ◽  
Cloud Infrastructure ◽  
Application Service ◽  
Cloud Application ◽  
Wide Range ◽  
Service Deployment ◽  
Cloud Applications

Abstract Many of the currently existing solutions for cloud cost optimisation are aimed at cloud infrastructure providers, and they often deal only with specific types of application services, leaving the providers of cloud applications without the suitable cost optimization solution, especially concerning the wide range of different application types. In this paper, we present an approach that aims to provide an optimisation solution for the providers of applications hosted in the cloud environments, applicable at the early phase of a cloud application lifecycle and for a wide range of application services. The focus of this research is development of the method for identifying optimised service deployment option in available cloud environments based on the model of the service and its context, with the aim of minimising the operational cost of the cloud service, while fulfilling the requirements defined by the service level agreement. A cloud application context metamodel is proposed that includes parameters related to both the application service and the cloud infrastructure relevant for the cost and quality of service. By using the proposed optimisation method, the knowledge is gained about the effects that the cloud application context parameters have on the service cost and quality of service, which is then used to determine the optimised service deployment option. The service models are validated using cloud application services deployed in laboratory conditions, and the optimisation method is validated using the simulations based on proposed cloud application context metamodel. The experimental results based on two cloud application services demonstrate the ability of the proposed approach to provide relevant information about the impact of cloud application context parameters on service cost and quality of service, and use this information in the optimisation aimed at reducing service operational cost while preserving the acceptable service quality level. The results indicate the applicability and relevance of the proposed approach for cloud applications in the early service lifecycle phase since application providers can gain useful insights regarding service deployment decision without acquiring extensive datasets for the analysis.

scholarly journals Quality of Service on Queueing Networks for the Internet

iBusiness ◽  
2013 ◽  
Vol 05 (03) ◽  
pp. 95-106
Author(s):  
Hans W. Gottinger
Keyword(s):  
Quality Of Service ◽  
Queueing Networks ◽  
The Internet

scholarly journals Quality of service performances of video and voice transmission in universal mobile telecommunications system network based on OPNET

2021 ◽  
Vol 10 (6) ◽  
pp. 3202-3210
Author(s):  
Sameer A. S. Lafta ◽  
Mohaned Mahdi Abdulkareem ◽  
Raed Khalid Ibrahim ◽  
Marwah M. Kareem ◽  
Adnan Hussein Ali
Keyword(s):  
Quality Of Service ◽  
Video Transmission ◽  
Mobile Telecommunications ◽  
Voice Transmission ◽  
Wide Range ◽  
Universal Mobile Telecommunications System ◽  
Video And Audio ◽  
Qos Performance ◽  
Umts Networks

The universal mobile telecommunications system (UMTS) has distinct benefits in that it supports a wide range of quality of service (QoS) criteria that users require in order to fulfill their requirements. The transmission of video and audio in real-time applications places a high demand on the cellular network, therefore QoS is a major problem in these applications. The ability to provide QoS in the UMTS backbone network necessitates an active QoS mechanism in order to maintain the necessary level of convenience on UMTS networks. For UMTS networks, investigation models for end-to-end QoS, total transmitted and received data, packet loss, and throughput providing techniques are run and assessed and the simulation results are examined. According to the results, appropriate QoS adaption allows for specific voice and video transmission. Finally, by analyzing existing QoS parameters, the QoS performance of 4G/UMTS networks may be improved.

Safe Quality of Service Aware Management of Heterogeneous Sensor Networks

2006 ◽  
Vol 07 (01) ◽  
pp. 179-193 ◽  
Author(s):  
Mohamed Younis ◽  
Waleed Youssef ◽  
Mohamed Eltoweissy ◽  
Stephan Olariu
Keyword(s):  
Quality Of Service ◽  
Network Performance ◽  
Vital Role ◽  
Heterogeneous Sensor Networks ◽  
Evolutionary Neural Network ◽  
Wide Range ◽  
Pervasive Service ◽  
Potential Damage

Wireless networked sensors are envisioned to play a vital role in the emerging pervasive service platforms that will instrument a wide range of next generation civil and military applications. Recently, we have proposed ANSWER: AutoNomouS Wireless sEnsor netwoRk as a service platform whose mission is to provide dependable information services to in-situ mobile users while satisfying their quality-of-service (QoS) requirements. Alongside with the stationary tiny sensors, the network employs more powerful mobile devices referred to as aggregation and forwarding nodes (AFNs). ANSWER exploits AFN mobility to support QoS requirements. However, as an AFN moves closer to an event (for example, a hazardous spill), it may be at risk (for example, due to potential damage). In this paper, we present a quantitative analysis of the interplay and balance between QoS support and asset safety. We propose a new scheme, called SAFER (for SAFEty-aware Relocation), which pursues relocation of the AFN in order to boost network performance without unnecessarily compromising AFN safety. For the relocation process to take place, SAFER uses historical data on detected events and employs an evolutionary neural network to assess the risk involved and predict good quality new position(s). Experimental results demonstrate the effectiveness of SAFER.

scholarly journals Predictive-Trend-Aware Composition of Web Services With Time-Varying Quality-of-Service

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 1910-1921 ◽  
Author(s):  
Xiaoning Sun ◽  
Shu Wang ◽  
Yunni Xia ◽  
Wanbo Zheng
Keyword(s):  
Quality Of Service ◽  
Web Services ◽  
Time Varying

scholarly journals Upaya Mengelola Kepuasan Nasabah Melalui Dimensi Kualitas Pelayanan (Studi Kasus Pada Nasabah Bank Tabungan Negara Cabang Pekanbaru)

2017 ◽  
Vol 3 (1) ◽  
pp. 31-35
Author(s):  
ZULIA KHAIRANI
Keyword(s):  
Information Technology ◽  
Quality Of Service ◽  
Customer Satisfaction ◽  
Sampling Technique ◽  
Quality Of Services ◽  
Level Of Satisfaction ◽  
Physical Form ◽  
Wide Range ◽  
Banking Business

Service quality is very important in the banking business. In addition to offering a wide range of products, improvements in terms of information technology, physical services, and non-physical services intended to improve the quality of service. To measure the level of satisfaction is necessary to know the extent to which the quality of services provided are able to create customer satisfaction. This study aims to analized how much influence the quality of service  to  customer satisfaction BTN  Bank  Branch  Pekanbaru. After  learning  literature review, an understanding of the influence of the physical form (tangibles), reliability (reliability), assurance (assurance), responsiveness (responsiveness), and awareness (empathy) with the variables that influence can be seen as a base strategy for development customer satisfaction.The sample in this study was 100 customers of Bank BTN Pekanbaru randomized using a sampling technique accidental sampling.Statistical analysis showed that the tangibles, reliability, responsiveness, and empathy partially and simultaneously positive and significant impact on customer satisfaction Bank BTN Pekanbaru.   Keywords: Customer Satisfaction, Tangible, Reliability, Responsiveness, Assurance, and Empathy

scholarly journals To the question of the necessity of optimization of business processes of modern enterprises

2019 ◽  
pp. 14-18
Author(s):  
O. N. Kolomyts ◽  
S. A. Miterev ◽  
V. S. Tomashenko
Keyword(s):  
Quality Of Service ◽  
Continuous Improvement ◽  
Process Improvement ◽  
Cycle Time ◽  
Business Processes ◽  
Rapid Development ◽  
Competitive Advantages ◽  
Wide Range ◽  
Automation Tools

The rapid development and change of technologies, growing diversification of business and other factors lead to a decrease in the efficiency of the existing system of business processes of companies, which necessitates its purposeful change, continuous improvement of both management and production activities of the organization, that is, the optimization of business processes. In this connection, the article explains the need to optimize the business processes of modern companies, which helps to identify opportunities to reduce costs, cycle time while improving the quality of service or product quality. Stages of optimization of business processes are allocated; the most often applied ways of optimization of business processes, namely: process improvement or restructuring and automation are considered; it is proved that, using for optimization the software, the organizations can manage processes faster and with fewer errors. Automation tools of business processes to optimize operations for organizations in a wide range of industries, contribute to a more efficient use of available resources and provide a more streamlined platform for employees and their tasks, help to save time, minimize costs, enhance competitive advantages and strengthen its position of competitiveness and to improve the efficiency of any company.

scholarly journals THE INVESTIGATION AND EVALUATION MULTISERVICE NETWORK NGN/IMS FOR MULTIMEDIA TRAFFIC

2020 ◽  
Vol 6 (3) ◽  
pp. 10-13
Author(s):  
Bayram G. Ibrahimov ◽  
◽  
Mehman F. Binnatov ◽  
Yalchin S Isayev ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Quality Of Service ◽  
Communication Networks ◽  
Customer Service ◽  
Network Architecture ◽  
Network Capacity ◽  
Network Efficiency ◽  
Wide Range ◽  
Triple Play

The subject of the study is multiservice communication network using the concept NGN (Next Generation Network) based on the open network architecture IMS (Internet Protocol Multimedia Subsystem), supporting a wide range services. The basis of this architecture is the IMS core, consisting of a set of specialized modules responsible for various functions for customer service. The purpose of the article is to analyze the existing technical capabilities of the IMS multimedia messaging subsystem and perspective solutions for the functioning of the NGN/IMS network efficiency in providing multimedia service. As the efficiency of the system, the capacity NGN/IMS networks is selected using the signaling system and protocols NGN. The capacity NGN/IMS networks during the establishment of a multimedia session was analyzed and the functional architecture of the IMS multimedia messaging subsystem that determine the interaction NGN signaling systems an protocols was explored. Manage the presentation Triple Play services to subscribers and simultaneously modify the media stream within the session allows the protocol for the initialization of the SIP and Diameter sessions, which are the main IMS signaling protocol. One of the important requirements for the IMS subsystem is the maintenance QoS (Quality of Service). A mathematical model for estimating the quality of communication services using a system GI/G/1/N based on the theory diffusion approximation is proposed. The research presented in this paper is very important for the theory queuing systems, since the article proposes a method for investigating multiservice communication networks with non-Poisson incoming flow and effective results are obtained for NGN/IMS networks. On the basis of the model analytical expressions are obtained, which allow evaluating the performance indicators of the Triple Play service. The proposed mathematical model can be used to solve a wide range of practical problems, including the management multiservice traffic in the process its transmission in multiservice telecommunications networks, taking into account the quality of service classes. Thus, studies NGN/IMS network capacity indicators using SIP protocols are relevant.

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