• Title/Summary/Keyword: Dynamic QoS

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A study of handover for dynamic QoS in B3G networks (B3G 네트워크에서 동적 QoS를 위한 핸드오버 연구)

  • Park, Sang-Joon;Lee, Jong-Chan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.3
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    • pp.1373-1379
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    • 2011
  • The SLA (Service Level Agreement) is once determined between service provider and users in B3G networks so that the network service must be provided as QoS management. Here, the network situation is changed as the time flow, and the service environment is also altered. Hence, dynamic QoS management scheme should be considered. In this paper, we propose a handover scheme for dyanamic QoS as the network situation in B3G networks. The heterogeneous networks can be used for dynamic QoS management in B3G networks.

SIP QoS Support in Broadband Access Networks (광대역 접속망에서 SIP QoS 지원 방안)

  • Park, Seung-Chul
    • Journal of KIISE:Information Networking
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    • v.34 no.1
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    • pp.73-80
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    • 2007
  • This paper presents an approach to support dynamic QoS(Quality of Service) requirements of largely emerging SIP(Session Initiation Protocol) multimedia applications in broadband access networks. The topology of QoS-enabled broadband access networks and its operational model to support SIP QoS are firstly suggested. And then the procedures to bind QoS-enabled SIP signaling into an IP QoS mechanism are presented. In this paper, DiffServ-based IP QoS architecture is deployed due to the complexity problem of the other IntServ architecture, and COPS(Common Open Policy Service) and COPS-PR protocol based signaling mechanisms are used to support dynamic DiffServ QoS, correspondent with dynamic SIP QoS. The broadband access network is assumed to support rapidly expanding Metro Ethernet 802.1 D/Q QoS, and how to translate SIP QoS parameters into IP DiffServ classes and DiffServ classes into 802.1 D/Q QoS parameters is also presented in this paper.

Absolute Differentiated Services for Optical Burst Switching Networks Using Dynamic Wavelength Assignment (동적 파장 할당 기법을 이용한 광 버스트 스위칭 네트워크에서의 절대적 QoS 제공)

  • 김성창;최진식;강민호
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.10
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    • pp.8-15
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    • 2003
  • In this paper, we address how to provide absolute differentiated services for optical burst switching (OBS) networks based on dynamic wavelength assignment. Unlike existing quality of service (QoS), such as buffer-based and offset-time based scheme, our proposed dynamicvirtual lambda partitioning (DVLP) scheme does not mandate any buffer or extra offset time, but can achieve absolute service differentiation between classes. This new DVLP scheme shares wavelength resources based on several different priority of classes in an efficient and QoS guaranteed manner. The performance results show that the proposed scheme effectively guarantees a target blocking probability of each traffic classes both in Poisson and Self-similar traffic environment.

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.

A Framework to Support Reconfiguration of Single Web Service Based on Dynamic QoS Properties (동적 QoS 속성을 고려한 단일 웹서비스의 교환을 지원하는 프레임워크)

  • Jin, Sang-Chan;Lee, Eun-Joo
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.4
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    • pp.77-86
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    • 2009
  • At present, Web services become main means to construct web applications. As the number of web services grows and various kind of web services have been produced, QoS properties of web services are one of important criteria to select more appropriate web services. However, the selected web services may become inappropriate for the Requester's requirements, because QoS is kind of dynamic properties. this paper proposes a framework that proposed that finds an appropriate web service for Requester's QoS requirements, and dynamically replaces an inappropriate web service with right one. The problems which happen in substitution step are also identified and the solutions are described with an illustrative example.

Design and Implementation of A Policy based QoS Management System to Support Dynamically Differentiated QoS (차등적인 QoS의 동적인 제공을 위한 정책기반 QoS 관리 시스템의 설계 및 구현)

  • Si-Ho, Cha;Kyu-Ho, Kim
    • Journal of the Korea Society of Computer and Information
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    • v.9 no.2
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    • pp.139-147
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    • 2004
  • To provide Internet QoS, the IETF Proposed two models of Integrated Services (IntServ) and Differentiated Services (DiffServ) Unlike IntServ where resource reservation and admission control is Per-flow based using RSVP. DiffServ supports aggregated traffic classes to provide various QoS to different classes of traffics. However a dynamic QoS management system is required to dynamically provide differentiated QoS for customers who require dynamic QoS change. This paper designed and implemented therefore a policy-based QoS management system to manage effectively and configure dynamically QoS of DiffServ networks. The validity of the system has been verified by the experimentation on the Linux-based DiffServ network.

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Heterogeneous Resource Management for Adaptive Grid System (적응형 그리드 시스템을 위한 이질적인 자원 관리)

  • Eui-Nam Huh;Woong-Jae Lee;Jong-Sook Lee
    • Journal of the Korea Society for Simulation
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    • v.12 no.4
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    • pp.51-59
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    • 2003
  • Real-Time applications on Grid environment have several problems in terms of resource management addressed as follows; (1) dynamic resource allocation to provide QoS objectives, (2) heterogeneous resources that is different scale, or capacity in same unit, and (3) resource availability, and resource needs. This paper describes the techniques of resource manager (RM) handling above problems to support QoS of dynamic real-time applications on Grid. The contributions of this paper to solve problems are as follows: unification of dynamic resource requirements among heterogeneous hosts, control of resources in heterogeneous environments, and dynamic load balancing/sharing. Our heuristic allocation scheme works not only 257% better than random, 142% better than round robin, and 36.4% better than least load in QoS sensitivity, but also 38.6% better than random, 28.5% better than round robin, and 31.6% better than least load in QoS.

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A Scalable Dynamic QoS Support Protocol (확장성 있는 동적 QoS 지원 프로토콜)

  • 문새롬;이미정
    • Journal of KIISE:Information Networking
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    • v.29 no.6
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    • pp.722-737
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    • 2002
  • As the number of multimedia applications increases, various protocols and architectures have been proposed to provide QoS(Quality of Service) guarantees in the Internet. Most of these techniques, though, bear inherent contradiction between the scalability and the capability of providing QoS guarantees. In this paper, we propose a protocol, named DQSP(Dynamic QoS Support Protocol), which provides the dynamic resource allocation and admission control for QoS guarantees in a scalable way. In DQSP, the core routers only maintain the per source-edge router resource allocation state information. Each of the source-edge routers maintains the usage information for the resources allocated to itself on each of the network links. Based on this information, the source edge routers perform admission control for the incoming flows. For the resource reservation and admission control, DQSP does not incur per flow signaling at the core network, and the amount of state information at the core routers depends on the scale of the topology instead of the number of user flows. Simulation results show that DQSP achieves efficient resource utilization without incurring the number of user flow related scalability problems as with IntServ, which is one of the representative architectures providing end-to-end QoS guarantees.

A Hybrid QoS Management Model for Distributed Multimedia Services in Ubiquitous Computing (유비쿼터스 컴퓨팅에서 분산 멀티미디어 서비스를 위한 하이브리드 QoS 관리 모델)

  • Jeong, Chang-Won;Lee, Geon-Yeob;Joo, Su-Chong
    • The KIPS Transactions:PartA
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    • v.15A no.2
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    • pp.101-110
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    • 2008
  • Ubiquitous computing has extended the computer system into the whole physical space and has ushered the emergence of more dynamic distributed systems. This environment require unique QoS parameters for various devices, resources and user requirements. In this paper, we propose a new hybrid QoS management model which defines a static-dynamic QoS parameter that is more appropriate to the ubiquitous computing environment. This model consists of the QoS Control Management Module(QoS CMM) in the client side and the Resource QoS Management Module (RQoS MM) in the server side. The RQoS MM deals with the static QoS parameters and the whole QoS control of the distributed control(QoS CMM) in order to minimize server load in cases of multiple communication. Finally, we present the experimental result of our location based application using a graphical user interface that shows the multimedia service execution of selected client device types such as desktop PC, notebook and PDA.

Layered Media Data Transmission Mechanism Of Considering Adaptive Dynamic QoS Control (동적 QoS 적응을 고려한 계층적 미디어 데이터의 전송 기법)

  • 나윤주;이승하;박준호;남지승;마평수
    • Proceedings of the IEEK Conference
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    • 2001.06c
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    • pp.97-100
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    • 2001
  • A common network such as internet does not provide a guaranteed network bandwidth to accommodate multimedia service in a reliable fashion. In this paper, we propose a new rate control mechanism for multimedia service on the internet which is adaptive to the dynamic QoS in real-time. Also we adapt an QoS monitoring module and real-time transmission control module to adapt dynamic network bandwidth. To do this, we used layer attribution of media data and also considered loss rate and buffer threshold in receiver side for measurement of dynamic QoS.

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