• Title, Summary, Keyword: QoS

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A Transition Scheme between UMTS QoS and IP QoS (UMTS QoS와 인터넷 QoS간의 변환기법)

  • 서정현;박애순;이재경;김상하
    • Proceedings of the Korean Information Science Society Conference
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    • pp.133-135
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    • 2001
  • UMTS QoS는 [1]에 정의되어 있는 바와 같이 계층적 구조를 가지고 있다. 즉, 단-대-단 QoS를 위해서는 UMTS QoS의 보장 뿐만 아니라 여러 계층에서의 QoS가 동시에 보장되어야 한다. 즉. UMTS 단일 입장에서 QoS를 보장하기 위해서는 인터넷 서비스 보장 기법과 UMTS QoS 보장 기법간의 변환 기법이 필수적이라 할 수 있다. 현재 winsock2에서는 QoS 보장을 위한 다양한 API가 새롭게 정의되어 있다. 이러한 API는 이동 단말기에 탑재될 것이므로 이 API에서 정의하는 QoS 파라미터와 UMTS망에서 사용되는 QoS 파라미터와의 변환 기법이 필요하게 된다. 본 논문은 UMTS QoS의 계어 측면에서 요구되는 변환기를 구성하는데 필요한 변환 메커니즘을 제안한다. 본 메커니즘은 외부 망과 독립적으로 구성된 UMTS QoS 모델과 Internet QoS 모델로으 변환을 통하여 단-대-단 QoS를 보장하는데 그 목적이 있다.

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A QoS DAG-based QoS Routing Scheme for Mobile Ad-hoc Networks (무선 Ad-hoc 네트워크를 위한 QoS DAG 기반의 QoS 라우팅 기법)

  • Kang, Yong-Hyeog;Kim, Hyun-Ho;Kim, Jung-Hee;Eom, Young-Ik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.10A
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    • pp.736-745
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    • 2009
  • The growth of mobile devices and the increase of using them have required the support of realtime multimedia application in wireless environments. Especially, wireless ad-hoc networks without central management system and with dynamically changing network topology need much researches of QoS routing for multimedia applications. However it is impossible to support the hard realtime QoS for these dynamic networks. In this paper, we propose a QoS routing scheme by using QoS DAG that is maintained by each mobile node and contains the QoS information for neighbor nodes. In order to maintain the QoS DAG, each node transmits its QoS information to neighbor nodes by local broadcasting, and the neighbor nodes update their QoS DAGs by the received message. In our proposed scheme, it is possible to search the QoS path efficiently by the QoS DAG without searching it in the whole network.

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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A Study on Packet Recombination based QoS/QoE Guaranteeing Scheme for Real-time IPTV Services (실시간 IPTV 서비스에서 패킷 재조합 기반의 QoS/QoE 보장 방안에 관한 연구)

  • Kim, Jun-Sik;Ryoo, In-Tae;Na, Won-Shik
    • The Journal of Advanced Navigation Technology
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    • v.14 no.4
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    • pp.530-536
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    • 2010
  • This paper proposes a QoS/QoE guaranteeing scheme by reassembling packets that have already been delivered to the end systems under the condition that there is no other way to fulfill user's QoS/QoE with the current network conditions. The proposed scheme is a QoS/QoE provisioning scheme that can be applied when IPTV streaming packets have not been consecutively received by the receiver. The receiving end system modifies the continuous counter field in the MPEG-2 Transport Stream and reassembles packets based on this information. In the simulation, broadcasting streaming environment has been implemented in order to verity the QoS/QoE performance of the proposed scheme under the good and poor network conditions.

Design and Implementation of EJB based QoS Management System framework for Differentiated Services (차등 서비스를 위한 EJB 기반 QoS 관리 시스템 프레임워크의 설계 및 구현)

  • Cha Si ho;Lee Jong eon;Ahn Byung ho;Cho Kuk hyun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.4B
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    • pp.192-201
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    • 2005
  • DiffServ supports aggregated traffic classes to provide various QoS to different classes of traffics. However, current DiffServ specifications do not have a complete QoS management framework. It is possible to lead to serious QoS violations without a QoS management support. From this reasoning, a QoS management system that can manage differentiated QoS provisioning is required. This paper proposes and implements a policy-based QoS management platform for differentiated services networks, which specifies QoS policies to guarantee dynamic QoS requirements. The implementation of the proposed platform is built on W framework and uses XML to represent and validate high-level QoS policies. High-level QoS policies are represented as valid XML documents and are mapped into Em beans of the EJB-based policy server of the platform. The policy distribution and the QoS monitoring are processed using SNMP.

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.

Design of Interworking Control System between QoS Parameters and QoE Items to Control Multimedia Services Quality (멀티미디어 서비스 품질 제어를 위한 QoS 파라미터와 QoE 요소간의 연동 제어 시스템 설계)

  • Kim, Hyun-Jong;Yun, Dong-Geun;Choi, Seong-Gon
    • The Journal of the Korea Contents Association
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    • v.10 no.4
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    • pp.45-54
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    • 2010
  • In this paper, we propose a quality interworking control system to enhance user's quality satisfaction in NGN environment by controling QoS parameters related with QoE in network layer when service user's QoE using variance multimedia service is poor. The proposed system gathers QoS parameter information in network layer through control packet such as RTCP, and evaluates QoE of multimedia service using these QoS parameter information. Comparing the evaluated QoE with the measured QoE in application layer, QCS judges quality degradation, deduces related QoS parameters and decides relative importance of each parameter when QoE is lower than threshold value. QCS generates QoS control values which is based on routing and switching policy in service quality control system(SCS) and forwards them to SCS. Through this proposed system, service and network providers can provide multimedia services of enhanced quality to service users taking account of service characteristic and network performance.

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.

Resource Adaptive QoS Management for Q-MOTP in MPLS Network (MPLS망에서 Q-MOTP를 위한 자원 적응적 QoS 관리)

  • Choi, Won-Keun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.12
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    • pp.204-209
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    • 2014
  • This paper has described a QoS mechanism and management for multimedia object transport protocol. Resource manager reports the system resource information to the QoS manager. Based on the combination of two informations, the more effective QoS management can be achieved by organic combination between them on the protocol time domain. Therefore, it is possible for QoS manager to decide call admission control quickly and detect and react the performance fluctuations in protocol time domain.

A Generic Quantitative Relationship to Assess Interdependency of QoE and QoS

  • Khorsandroo, Sajad;Noor, Rafidah Md.;Khorsandroo, Sayid
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.7 no.2
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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.