• Title/Summary/Keyword: quality of service(QoS)

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Network Adaptive Quality of Service Method in Client/Server-based Streaming Systems (클라이언트/서버 기반 스트리밍 시스템에서의 네트워크 적응형 QoS 기법)

  • Zhung, Yon-il;Lee, Jung-chan;Lee, Sung-young
    • The KIPS Transactions:PartA
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    • v.10A no.6
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    • pp.691-700
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    • 2003
  • Due to the fast development of wire&wireless internet and computer hardware, more and more internet services are being developed, such as Internet broadcast, VoD (Video On Demand), etc. So QoS (Qualify of Service) is essentially needed to guarantee the quality of these services. Traditional Internet is Best-Effort service in which all packets are transported in FIFO (First In First Out) style. However, FIFO is not suitable to guarantee the quality of some services, so more research in QoS router and QoS protocol are needed. Researched QoS router and protocol are high cost and inefficient because the existing infra is not used. To solve this problem, a new QoS control method, named Network Adaptive QoS, is introduced and applied to client/server-based streaming systems. Based on network bandwidth monitoring mechanism, network adaptive QoS control method can be used in wire&wireless networks to support QoS in real-time streaming system. In order to reduce application cost, the existing streaming service is used in NAQoS. A new module is integrated into the existing server and client. So the router and network line are not changed. By simulation in heavy traffic network conditions, we proved that stream cannot be seamless without network adaptive QoS method.

Design and Implementation of A Section-Specific QoE Frame for Efficient QoE Measurement (구간별 QoE 프레임을 이용한 QoE 네트워크 설계 및 구현)

  • Cho, Sungchol;Han, Li;Sun, Shimin;Jin, Xianshu;Liu, Jing;Han, Sunyoung
    • Journal of KIISE:Information Networking
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    • v.41 no.4
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    • pp.151-166
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    • 2014
  • The present method of measuring QoE (Quality of Experience) was to measure the whole block from the server that provides service to the terminal that the client gets the service. In this way, it was possible to simply determine whether the quality of QoE was good or not, and when the quality of QoE became bad, there was no way of presenting solutions. Also, as QoE metrics are numerous, there has been no strict regulation on how to use. This study analyzed QoE metrics in the viewpoints of network and clients, subdivided the whole service into three phases including one from the server providing the service to the router, another from the router to the terminal getting the service, and the third from the service router to the client router, and presented QoE metric frames appropriate for each phase. Through this, in the KOREN-CERNET environment, this study designed and embodied QoE network and demonstrated stability of QoE network, reduction in client complaint settlement time, and content adjustment effect according to the network change.

Implementation of QoS Provisioning Model in VANET (VANET에서 QoS Provisioning모델의 구현)

  • Huh, Jee-Wan;Song, Wang-Cheol
    • Proceedings of the Korea Contents Association Conference
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    • 2009.05a
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    • pp.884-888
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    • 2009
  • Vehicular Adhoc Networks (VANET), a Vehicle-to-Infrastucture or Vehicle-to-Vehicle communication technology, is an area that makes more specific use of Mobile Adhoc Networks(MANET). VANET's Quality of Service(QoS) focuses on preventing possible emergencies like car crash from happening by immediately transmitting information to the cars around, while MANET's QoS is being studied for the quality of multimedia data such as Video on Demand(VoD), Video streaming, Voice over IP(VoIP), etc. In this paper, I structure the actual network configuration using Link State Routing(LSR), implement QoS Provisioning Model using Common Open Policy Service(COPS), and suggest more effective k-hop Cluster and inter-domain policy negotiation which fit better to the characteristics of VANET.

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Price-Based Quality-of-Service Control Framework for Two-Class Network Services

  • Kim, Whan-Seon
    • Journal of Communications and Networks
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    • v.9 no.3
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    • pp.319-329
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    • 2007
  • This paper presents a price-based quality-of-service (QoS) control framework for two-class network services, in which circuit-switched and packet-switched services are defined as "premium service class" and "best-effort service class," respectively. Given the service model, a customer may decide to use the other class as a perfect or an imperfect substitute when he or she perceives the higher utility of the class. Given the framework, fixed-point problems are solved numerically to investigate how static pricing can be used to control the demand and the QoS of each class. The rationale behind this is as follows: For a network service provider to determine the optimal prices that maximize its total revenue, the interactions between the QoS-dependent demand and the demand-dependent QoS should be thoroughly analyzed. To test the robustness of the proposed model, simulations were performed with gradually increasing customer demands or network workloads. The simulation results show that even with substantial demands or workloads, self-adjustment mechanism of the model works and it is feasible to obtain fixed points in equilibrium. This paper also presents a numerical example of guaranteeing the QoS statistically in the short term-that is, through the implementation of pricing strategies.

Quality of Service Supporting MPLS Network using CR-LDP and qGSMP Protocols (CR-LDP와 qGSMP을 이용한 MPLS 망의 QoS 지원)

  • 김인재;이병수
    • Journal of the Korea Computer Industry Society
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    • v.2 no.4
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    • pp.417-424
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    • 2001
  • Internet networks consisting of existing routers show the limits in efficiency of traffic managements. In order to overcome the limits, MPLS System is high speed switching technology and is not based on IP address but based on label was designed. However MPLS system being based on ATM has the difficulties of supporting Qos(Quality of Service). This paper suggested the way to consist a service-assured-network using CR-LDP protocol which was designed for guaranteeing QoS in MPLS system being based on ATM switch and using qGSMP protocol, and the way to implicitly establish LSP by implementing QoS Translation and QoS Mapping in LER System.

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The Study on the Estimate of Video Quality in the IPTV (IPTV 영상품질 평가에 관한 연구)

  • Lee, Jae-Hee;Lee, Sang-Ha;Kim, Chin-Chal
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.4B
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    • pp.232-241
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    • 2008
  • In this paper, for analysing the major factors giving the effect to the quality of video on the multicasting service of IPTV, we construct the lab test network environment similar to the real IPTV service network environment. We measure the quality of video on the multicasting of IPTV generating and increasing the broadcasting traffic on the situation that apply the QoS technique to the test lab network and not apply the QoS technique and then find out the threshold value of factors giving the effect to the quality of video on the multicasting service of IPTV. This paper can be used in basic date for guaranteeing the constant video quality on the multicasting service of IPTV.

The analysis of the impact of the wireless channel quality on the quality of experience (QoE) through statistical analysis (통계적 분석을 통한 무선 채널 품질이 사용자 체감 품질에 미치는 영향 분석)

  • Kim, Beom-Joon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.4
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    • pp.491-498
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    • 2014
  • As internet services are being provided through a wireless access, the importance of quality of experience (QoE) is stressed that is defined as the quality that indicates user's actual feeling when a service is provided. Unlike quality of service (QoS) that can be expressed as a numerical value, it is difficult to represent QoE in an objective way. If an internet service is serviced over a wireless channel, its QoE can be affected by a number of factors such as fading, mobility and so on. This paper, therefore, attempts to specify the relationship between QoE and QoS by conducting practical measurements for the voice service through 3G high speed packet access (HSPA) access network. Analysing the measured results, it has been shown that received signal strength indicator (RSSI) has a great influence on mean opinion score (MOS) through transmission delay.

Differentiated Quality of Service Model in the Internet (인터넷에서의 차별화된 서비스품질 제공 방안)

  • Kim, Dong-Chul;Jang, Hee-Seon
    • IE interfaces
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    • v.23 no.2
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    • pp.193-202
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    • 2010
  • The quality of service(QoS) model should be presented with the optimal network design to effectively provide the multimedia data services between users and converged services with mobile or TV in the next-generation Internet. In specific, the method to provide differentiated services for each user is needed in the given Internet node to offer the previously negotiated QoS with the user. In this paper, the performance of the QoS enabling technologies in the differentiated services(DiffServ) network domain is analyzed. The QoS offering model and QoS metrics are presented to analyze the performance of the major scheduling algorithms. Under the real network topology and virtual service scenarios in the university, the NS-2 network simulation based on the discrete-event is performed. The results show that the ratio-based scheduling method is more effective rather than the bandwidth-assignment method.

Service Quality Management Based on Quality of Experience (체감품질을 고려한 서비스 품질의 관리)

  • Shin, Minsoo;Kim, Dohoon
    • Korean Management Science Review
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    • v.33 no.3
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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.

A Dynamic QoS Adjustment Enabled and Load-balancing-aware Service Composition Method for Multiple Requests

  • Wu, Xiaozhu
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.15 no.3
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    • pp.891-910
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    • 2021
  • Previous QoS-aware service composition methods mainly focus on how to generate composite service with the optimal QoS efficiently for a single request. However, in the real application scenarios, there are multiple service requests and multiple service providers. It is more important to compose services with suboptimal QoS and maintain the load balance between services. To solve this problem, in this paper, we propose a service composition method, named as dynamically change and balancing composition method (DCBC). It assumes that the QoS of service is not static, and the services can adjust the value of QoS to gain more opportunities to be selected for composition. The method mainly includes two steps, which are the preprocessing step and the service selection step. In the preprocessing step, a backward global best QoS calculation is performed which regarding the static and dynamic QoS respectively; then guided by the global QoS, the feasible services can be selected efficiently in the service selection step. The experiments show that the DCBC method can not only improve the overall quality of composite services but also guarantee the fulfill ratio of requests and the load balance of services.