• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권2호
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• pp.327-346
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• 2013

Researchers as well as network providers are increasingly interested in understanding how a network user's experience changes in relation to different quality of service (QoS) parameters, with many attempts being made to identify the general relationship between quality of experience (QoE) and QoS. Several relations in different function forms have been proposed. There are instances when this variety of proposed functions potentially results in one problem having completely dissimilar solutions at the same time. The question then is which function form is the one that can better explain this relationship. In this paper, three major existing quantitative relationships between QoE and QoS are investigated. After conducting a comprehensive comparative analysis between them, a new definition of QoE-QoS dependency appears. It then results in identifying a new mutual relationship between QoE and QoS. The newly proposed relationship improves the deficiency of previous QoE-QoS relationships along with solving the problem of diversity of simultaneous solutions for one problem.

• International Journal of Computer Science & Network Security
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• 제21권3호
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• pp.229-234
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• 2021

The explosive growth of video-based services is considered as the dominant contributor to Internet traffic. Hence it is very important for video service providers to meet the quality expectations of end-users. In the past, the Quality of Service (QoS) was the key performance of networks but it considers only the network performances (e.g., bandwidth, delay, packet loss rate) which fail to give an indication of the satisfaction of users. Therefore, Quality of Experience (QoE) may allow content servers to be smarter and more efficient. This work is motivated by the inherent relationship between the QoE and the QoS. We present a no-reference (NR) prediction model based on Deep Neural Network (DNN) to predict video QoE. The DNN-based model shows a high correlation between the objective QoE measurement and QoE prediction. The performance of the proposed model was also evaluated and compared with other types of neural network architectures, and three known machine learning methodologies, the performance comparison shows that the proposed model appears as a promising way to solve the problems.

• 경영과학
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• 제33권3호
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• pp.19-30
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• 2016

This study provides a framework to assess network design under the regime of QoE (Quality of Experience). Our approach is expected to reveal the necessity of developing the QoE measures and applying this notion to network design, particularly in the mobile environment. Furthermore, our model shows the ample potential that both users and network providers are able to attain a win-win case by shifting the focus on network design and service operations from QoS (Quality of Service) to QoE. Since the former considers only relevant technological specifications, it may fail in capturing critical factors surrounding users, such as a context where the corresponding user is working on. For example, according to one study [13], the bit-rate, a widely employed QoS measure, shows inferior performance in provisioning network resources to the MOS (Mean Opinion Score), a representative QoE measure. Our framework develops the idea and construct a prototype to systematically assess network design and operations in terms of QoE. The proposed prototype aims at achieving a higher level of efficiency without severely deteriorating users' satisfaction level. We also provide some simulation results which support our idea. That is, reducing the chance of over-provisioning on the basis of the QoE paradigm results in a great flexibility. It may give price cut for users or postponement of network investment for providers or both. Our simulation results also seem robust irrespective of the forms of the QoS-QoE relationship.

• 한국통신학회논문지
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• 제30권11B호
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• pp.698-706
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• 2005

본 논문은, IEEE 802.11e MAC의 QoS 지원 기능에 대한 연구로서, MAC의 파라미터별 QoS 관련성을 중심으로 살펴보았다. 지연 성능과 대역폭 할당의 두 QoS 지표에 대해 MAC 파라미터, 즉 CWmin 과 AIFS의 연관관계를 살펴보고, 그 결과 효과적인 파라미터 운용 방안을 제시하였다. 클래스간의 우선순위를 유휴 채널에의 접근성에 대한 차별로 해석함으로써, 대역폭이 아닌 지연 성능의 차별성이 클래스간의 서비스 차별성 구현의 목표가 됨을 논의하였다. 이를 기반으로, 소위 지연-대역폭 커플링 문제를 위한 해결방안으로서 AIFS와 지연 성능과의 관계에 초점을 둔 연구 결과로 이어졌다. 이러한 관계의 분석을 위하여 MAC 동작에 대한 모델링 및 해석을 수행하였으며, 그 결과 AIFS와 지연 성능과의 관계를 도출하였다. 다양한 환경에서의 시뮬레이션과, MAC 해석 결과에 대한 시뮬레이션 등을 통하여, QoS 요구 사항에 대한 MAC 파라미터의 적절한 운용 방안을 논의하였다.

• 한국전자통신학회논문지
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• 제9권4호
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• pp.491-498
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• 2014

무선 접속을 통한 인터넷 서비스가 보편화된 최근 사람이 서비스를 이용하는 과정에서 실제로 느끼는 품질인 사용자 체감 품질(QoE; Quality of Experience)의 중요성이 더욱 강조되고 있는데 사용자 체감 품질은 서비스 품질 (QoS; Quality of Service)와 같이 객관적인 수치화가 불가능하다는 특징이 있다. 유선과는 달리 무선 접속을 통해서 제공되는 IP 서비스는 매우 많은 요인에 의해서 사용자 체감 품질이 영향을 받을 수 있다. 따라서 본 논문에서는 대표적인 무선 접속 서비스인 HSPA (High Speed Packet Access)를 통해서 음성 서비스가 제공될 때 측정 가능한 품질지표를 선정하고 이들에 대한 실측값을 통계적으로 분석하여 서비스 품질과 사용자 체감 품질 지표와의 상관관계를 밝히고자 한다. 분석 결과 RSSI (Received Signal Strength Indicator)와 전송 지연의 상관관계가 매우 높고 그에 이어 전송 지연과 MOS (Mean Opinion Score)와 매우 높은 상관관계를 가짐을 알 수 있었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.86-89
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• 1998

Multiple types of information in a multimedia service are delivered though multiple virtual connections on ATM network, while each virtual connection may be controlled independently. A multimedia service requires an associative relationship among multiple information streams to provide required harmonization. There may be required additional traffic descriptors to guarantee the required harmonization among multiple information streams in a multimedia service. For buffering of large bandwidth information stream(e.g., video), extremely large buffer size is necessary, but this approach should not be efficient way to compensate a severely delayed cells/blocks experienced at network. The best way to solve this problem will be minimization of relative-delayed-transfer of cells/blocks to application processes through ATM network control. To minimize a delayed transfer the mapping between relative delay parameter(i.e., associative Group QoS parameters) and per-VC traffic descriptor will be necessary. This paper is present additional functions and parameters to interpret the mapping between relative delay parameters(i.e., associative Group QoS parameters) and per-VC traffic descriptors in ATM API for multimedia application services.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권7호
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• pp.2513-2530
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• 2021

With the fast development of information and communication technologies, video streaming services and applications are increasing rapidly. However, the network condition is volatile. In order to provide users with better quality of service, it is necessary to develop an accurate and low-complexity model for Quality of Experience (QoE) prediction of time-varying video. Memory effects refer to the psychological influence factor of historical experience, which can be taken into account to improve the accuracy of QoE evaluation. In this paper, we design subjective experiments to explore the impact of Short-Term Memory (STM) on QoE. The experimental results show that the user's real-time QoE is influenced by the duration of previous viewing experience and the expectations generated by STM. Furthermore, we propose analytical models to determine the relationship between intrinsic video quality, expectation and real-time QoE. The proposed models have better performance for real-time QoE prediction when the video is transmitted in a fluctuate network. The models are capable of providing more accurate guidance for improving the quality of video streaming services.

• 정보처리학회논문지C
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• 제16C권6호
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• pp.717-724
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• 2009

IPTV 서비스의 품질은 IPTV 서비스가 성공적으로 정착되기 위한 가장 중요한 요소라 할 수 있다. 본 논문에서는 IPTV 서비스가 전달되는 계층적인 구조에 있어서 각 계층을 대표하는 서비스 품질 지표들을 선정하고 이들 간의 상관관계를 분석한다. 이를 위하여 IPTV 서비스가 전달되는 과정을 최대한 실제와 가깝게 구현하기 위한 시험 네트워크를 구축하고 선정된 품질 지표들에 대한 반복적인 측정을 수행한다. 측정을 통한 분석 결과 네트워크 계층의 대표적인 서비스 품질 지표 가운데 패킷손실률이 지연이나 지터에 비해 IPTV 서비스의 비디오 품질에 더 큰 영향을 미친다는 점을 보인다.