Correlating Quality of Experience and Quality of Service for Network Applications

2010 ◽  
pp. 326-351 ◽  
Author(s):  
Mihai Ivanovici ◽  
Razvan Beuran
Keyword(s):  
Quality Of Service ◽  
Video Transmission ◽  
Quality Of Experience ◽  
Point Of View ◽  
File Transfer ◽  
Application Performance ◽  
Network Applications ◽  
Network Application ◽  
The One

There is a significant difference between what a network application experiences as quality at network level, and what the user perceives as quality at application level. From the network point of view, applications require certain delay, bandwidth and packet loss bounds to be met – ideally zero delay and zero loss. However, users should not be directly concerned with network conditions, and furthermore they are usually neither able to measure nor predict them. Users only expect good application performance, i.e., a fast and reliable file transfer, high quality for voice or video transmission, and so on, depending on the application being used. This is true both in wired as well as wireless networks. In order to understand network application behavior, as well as the interaction between the application and the network, one must perform a delicate task – the one of correlating the Quality of Service (QoS), i.e., the degradation induced at network level (as a measure of what the application experiences), with the Quality of Experience (QoE), i.e., the degradation perceived by the user at application level (as a measure of the user-perceived quality) (Ivanovici, 2006). This is done by simultaneously measuring the QoS degradation and the application QoE on an end-to-end basis. These measures must be then correlated by taking into account their temporal relationship. Assessing the correlation between QoE and QoS makes it possible to predict application performance given a known QoS degradation level, and to determine the QoS bounds that are required in order to attain a desired QoE level.

scholarly journals IMPACT OF QUEUING DISCIPLINES ON THE PERFORMANCE OF MULTI-CLASS TRAFFIC IN A NETWORK

2021 ◽  
Vol 9 (1) ◽  
pp. 691-697
Author(s):  
N. Sugirtham, R. Sherine Jenny
Keyword(s):  
Quality Of Service ◽  
User Satisfaction ◽  
File Transfer ◽  
Network Resources ◽  
Network Applications ◽  
End To End Delay ◽  
Opinion Score ◽  
Quality Of Service Parameters ◽  
First In First Out

Network applications demand quality of service for enhanced call quality and increased user satisfaction. Hence, implementing queuing discipline at switches and routers in a network will govern the way packets are buffered while waiting for transmission. Queuing disciplines like first-in first-out (FIFO) queuing, priority queuing (PQ), weighted-fair queuing (WFQ), custom queuing and modified weighted round robin are more prominently deployed in network applications. These queuing disciplines help to control and manage network resources by fixing priorities for specific types of data on the network. The paper aims to analyze the quality of service parameters for various real time applications like File transfer protocol(FTP), email, database, Voice over IP(VOIP), video and web browsing,etc., and helps to optimise the use of available network resources. Moreover the quality of the network is compared using different QoS parameters such as end-to-end delay, throughput, jitter and Mean Opinion Score (MOS). This paper focuses on various queuing disciplines with low and high network traffic.

Quality of Experience vs. QoS in Video Transmission

2010 ◽  
pp. 352-376 ◽  
Author(s):  
André F. Marquet ◽  
Jânio M. Monteiro ◽  
Nuno J. Martins ◽  
Mario S. Nunes
Keyword(s):  
Communication Networks ◽  
Video Transmission ◽  
Quality Of Experience ◽  
Video Quality ◽  
Subjective Assessment ◽  
Ip Networks ◽  
Point Of View ◽  
Qos Parameters ◽  
Quality Video

In legacy television services, user centric metrics have been used for more than twenty years to evaluate video quality. These subjective assessment metrics are usually obtained using a panel of human evaluators in standard defined methods to measure the impairments caused by a diversity of factors of the Human Visual System (HVS), constituting what is also called Quality of Experience (QoE) metrics. As video services move to IP networks, the supporting distribution platforms and the type of receiving terminals is getting more heterogeneous, when compared with classical video distributions. The flexibility introduced by these new architectures is, at the same time, enabling an increment of the transmitted video quality to higher definitions and is supporting the transmission of video to lower capability terminals, like mobile terminals. In IP Networks, while Quality of Service (QoS) metrics have been consistently used for evaluating the quality of a transmission and provide an objective way to measure the reliability of communication networks for various purposes, QoE metrics are emerging as a solution to address the limitations of conventional QoS measuring when evaluating quality from the service and user point of view. In terms of media, compressed video usually constitutes a very interdependent structure degrading in a non-graceful manner when exposed to Binary Erasure Channels (BEC), like the Internet or wireless networks. Accordingly, not only the type of encoder and its major encoding parameters (e.g. transmission rate, image definition or frame rate) contribute to the quality of a received video, but also QoS parameters are usually a cause for different types of decoding artifacts. As a result of this, several worldwide standard entities have been evaluating new metrics for the subjective assessment of video transmission over IP networks. In this chapter we are especially interested in explaining some of the best practices available to monitor, evaluate and assure good levels of QoE in packet oriented networks for rich media applications like high quality video streaming. For such applications, service requirements are relatively loose or difficult to quantify and therefore specific techniques have to be clearly understood and evaluated. By the mid of the chapter the reader should have understood why even networks with excellent QoS parameters might have QoE issues, as QoE is a systemic approach that does not relate solely to QoS but to the ensemble of components composing the communication system.

scholarly journals IMPACT OF QUEUING DISCIPLINES ON THE PERFORMANCE OF MULTI-CLASS TRAFFIC IN A NETWORK

2021 ◽  
Vol 9 (1) ◽  
pp. 698-703
Author(s):  
N. Sugirtham, R. Sherine Jenny
Keyword(s):  
Quality Of Service ◽  
User Satisfaction ◽  
File Transfer ◽  
Network Resources ◽  
Network Applications ◽  
End To End Delay ◽  
Opinion Score ◽  
Quality Of Service Parameters ◽  
First In First Out

Network applications demand quality of service for enhanced call quality and increased user satisfaction. Hence, implementing queuing discipline at switches and routers in a network will govern the way packets are buffered while waiting for transmission. Queuing disciplines like first-in first-out (FIFO) queuing, priority queuing (PQ), weighted-fair queuing (WFQ), custom queuing and modified weighted round robin are more prominently deployed in network applications. These queuing disciplines help to control and manage network resources by fixing priorities for specific types of data on the network. The paper aims to analyze the quality of service parameters for various real time applications like File transfer protocol(FTP), email, database, Voice over IP(VOIP), video and web browsing,etc., and helps to optimise the use of available network resources. Moreover the quality of the network is compared using different QoS parameters such as end-to-end delay, throughput, jitter and Mean Opinion Score (MOS). This paper focuses on various queuing disciplines with low and high network traffic.

scholarly journals Are users’ ratings on Tripadvisor similar to hotel categories in Europe?

2018 ◽  
pp. 305-316 ◽  
Author(s):  
Eva Martin-Fuentes ◽  
Carles Mateu ◽  
César Fernández
Keyword(s):  
Quality Of Service ◽  
Customer Satisfaction ◽  
Classification System ◽  
Point Of View ◽  
European Countries ◽  
The One ◽  
User Ratings ◽  
One Way Anova

European countries do not have the same hotel classification system. Therefore, the criteria and requirements used to assign star ratings to hotels do not concur among the different countries. There have been some criticisms about the way hotel stars are assigned, because the requirements do not necessarily match the quality of service offered. Technical criteria such as infrastructure and room dimensions are taken into account, but users do not perceive them although these have nothing to do with the satisfaction. This study aims to determine whether the hotel category of about 80,000 hotels in 9 different European countries on TripAdvisor is related to customer satisfaction, measured from the point of view of the user ratings on this site. The one-way ANOVA test shows that there are significant differences between the average ratings of the hotel category, except in the classification of 1-star and 2-star hotels from most countries analysed that behave similarly, and 1-star and 3-star hotels from Austria, Greece, Portugal, Spain and UK that are ranked similarly.

Quality of experience and quality of service-aware handover for video transmission in heterogeneous networks

2019 ◽  
pp. e2064 ◽  
Author(s):  
Iago Medeiros ◽  
Lucas Pacheco ◽  
Denis Rosário ◽  
Cristiano Both ◽  
Jéferson Nobre ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Heterogeneous Networks ◽  
Video Transmission ◽  
Quality Of Experience

scholarly journals Conceptual analysis of the notion of quality of services

2009 ◽  
Vol 50 ◽  
Author(s):  
Jérémy Besson ◽  
Albertas Čaplinskas
Keyword(s):  
Quality Of Service ◽  
Conceptual Analysis ◽  
Object Oriented ◽  
Point Of View ◽  
Quality Of Services ◽  
Software Systems ◽  
Service Oriented

In the last decade the component technologies have evolved from object-oriented to serviceoriented ones. Services are seen as utilities based on a pay-for-use model. This model requires providing and guaranteeinga certain Quality of Service (QoS). However, QoS and even a service itself can be defined and understood in many different ways. It is by far not obvious which of these approaches and in what extent they should be used when developing service-oriented software systems. This paper analyzes the notion of QoS namely from this point of view.

scholarly journals Hygienic Conditions and Quality of Dishes Cooked and Sold by Women Traders in the Town of Korhogo

2020 ◽  
pp. 1-10
Author(s):  
Karamoko Detto ◽  
Yoro Dezay Thierry ◽  
Moroh Jean-Luc Aboya ◽  
Koffi Alex Joel ◽  
Djè Koffi Marcellin
Keyword(s):  
Point Of View ◽  
Ishikawa Diagram ◽  
Hygiene Practices ◽  
The One ◽  
Cleaning And Disinfection ◽  
The Town ◽  
Microbiological Analyses ◽  
Good Hygiene ◽  
Hygienic Conditions

The aim of this study is to evaluate the hygienic quality of the dishes cooked and sold by the women traders in the town of Korhogo. The study was carried out with 45 restaurants in the town of Korhogo. It consisted on the one hand, a survey based on the Ishikawa diagram in order to assess the hygienic conditions, and on the other hand of microbiological analyses of the ready-to-serve meals. A total of 90 samples were taken, including 2 dishes per restaurant, respectively consisting of one hot and one cold dish. Generally, results showed that hygienic conditions were unsatisfactory based on the utilized guidelines. From a microbiological point of view, the meal samples were 75.2% satisfactory, 7.6% acceptable and 17.2% unsatisfactory. In view of these results, it appears essential to improve hygiene conditions by greater involvement of the official services involved in training these traders and monitoring compliance with good hygiene practices and the establishment of a program of cleaning and disinfection of premises and equipment.

scholarly journals The Control Process Effectiveness: Organization Versus Customer

2013 ◽  
Vol 11 (8) ◽  
pp. 345
Author(s):  
Ofer Barkai
Keyword(s):  
Quality Of Service ◽  
Customer Service ◽  
Internal Control ◽  
Service Providers ◽  
Control Process ◽  
Point Of View ◽  
Large Organization ◽  
Control Processes ◽  
Telecommunication Company

This research project, which was implemented in an organization whose primary function is providing service (Telecommunication company), studies the scope of the correlation between the quality of service from the customers point of view (customer survey) and the organization (Telecommunication company systems). The research is important both for economic and scientific reasons. It involves many organizational control units which require significant monetary investments. From a scientific point of view, the research is important because it can shed light on the asymmetrical point of view existing between customers and organizations. Organizations that are service providers place high importance on the quality of service and their image as perceived by their customers. Quality of service is measured through internal control processes and from there is passed on to the staff who are directly involved in customer service. In this study, we focus on a large organization which implements control processes and then provides service to customers. Therefore, the activities of this organization are judged first and foremost on the basis of the service quality provided. The existing internal control processes of the organization, which measure the standard of service provided on the basis of organizational benchmarks are separate from those that measure customer satisfaction. In this project, we analyze the correlation between the outlook of the customer and the results of internal control processes.

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