• Title/Summary/Keyword: QoS Implementation

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Adaptive Negotiation Interface for End-to-End QoS in Mobile Network (무선네트워크에서의 종단간 QoS를 고려한 적응적 협상 인터페이스)

  • Jang, Ik-Gyu;Park, Hong-Sung
    • Proceedings of the KIEE Conference
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    • 2004.05a
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    • pp.68-70
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    • 2004
  • In this paper we develop an adaptive interface between video compression and transission protocols to handle QoS fluctuations that are common to mobile communication systems. We consider various generic design alternatives for QoS adaptation and identify 'QoS negotiation' as the most promissing. This method gives the best possibilities to obtain system-wide efficiency. To handle the indued system complexity we apply a design philosophy (called ARC) that separates implementation dependencies by introducing QoS interfaces between system modules. In the ARC phlosophy the implementation details are hidden in the subsystems. To assure efficient adaptation, the QoS must be negotiated between modules. We select the QoS parameters that are both necessary and sufficient for efficient negotiation between the video encoder and protocol modules. We describe the relation between the QoS parameters at the interface and the internal parameters of common video coding methods and protocol elements. Furthermore, we describe a negotiation procedure that allows a system-wide optimum to emerge.

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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.

ADesign and Implementation of Policy-based Network Management System for Internet QoS Support Mobile IP Networks (인터넷 QoS 지원 이동 IP 망에서의 정책기반 망 관리 시스템 설계 및 구현)

  • 김태경;강승완;유상조
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.2B
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    • pp.192-202
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    • 2004
  • In this paper we have proposed policy-based network management system architecture for Internet QoS support Mobile IP networks that is divided into four layers(application layer, information management layer, policy control layer, device layer), then we propose an implementation strategy of policy-based network management system to enforce various control and network management operations and a model of policy server using SCOPS(Simple Common Open Policy Service) protocol that is developed in this research. For policy-based mobile IP network management system implementation, we have derived four policy classes(access control, mobile IP operation, QoS control, and network monitoring) and we showed operation procedures for each policy scenarios. Finally we have implemented Internet QoS support policy-based mobile IP network testbed and management system and verified out DiffServ policy enforcement behaviors for a target class service that is arranged a specific bandwidth on network congestion conditions.

Development and Implementation of a Linux based VoIP Gateway for Supporting QoS (QoS 지원형 리눅스 기반 VoIP 게이트웨이 설계 및 구현)

  • 이명근;서정민;임재용;이상정
    • Proceedings of the Korean Information Science Society Conference
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    • 2003.04d
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    • pp.106-108
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    • 2003
  • 인터넷의 확산과 발전으로 인한 서비스의 증가로 안정되고 고품질의 서비스를 위한 네트워크의 QoS 확보와 보장이 중요한 이슈로 대두되고 있다. 특히 VoIP와 같은 실시간 통신이 보장되어야 하고, 통화 품질이 수익 모델과 직결하는 서비스 및 장비에서는 QoS 지원이 매우 중요하다. 본 논문에서는 실시간 임베디드 리눅스 기술과 리눅스 커널에서 제공하는 라우팅 및 QoS 알고리즘을 적응하여 QoS 지원형 VoIP 게이트웨이를 설계 구현하고 성능을 측정 실험한다.

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Design and Implementation of Distributed QoS Management Architecture for Real-time Negotiation and Adaptation Control on CORBA Environments (CORBA 환경에서 실시간 협약 및 작응 제어를 위한 분사 QoS 관리 구조의 설계 및 구현)

  • Lee, Won-Jung;Shin, Chang-Sun;Jeong, Chang-Won;Joo, Su-Chong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.1C
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    • pp.21-35
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    • 2002
  • Nowadays, in accordance with increasing expectations of multimedia stream service on the internet, a lot of distributed applications are being required and developed. But the models of the existing systems have the problems that cannot support the extensibility and the reusability, when the QoS relating functions are being developed as an integrated modules which are suited on the centralized controlled specific-purpose application services. To cope with these problems, it is suggested in this paper to a distributed QoS management system on CORBA, an object-oriented middleware compliance. This systems we suggested can provides not only for efficient control of resources, various service QoS, and QoS control functions as the existing functions, but also QoS control real-time negotiation and dynamic adaptation in addition. This system consists of QoS Control Management Module(QoS CMM) in client side and QoS Management Module(QoS MM) in server side, respectively. These distributed modules are interfacing with each other via CORBA on different systems for distributed QoS management while serving distributed streaming applications. In phase of design of our system, we use UML(Unified Modeling Language) for designing each component in modules, their method calls and various detailed functions for controlling QoS of stream services. For implementation of our system, we used OrbixWeb 3.1c following CORBA specification on Solaris 2.5/2.7, Java language, Java Media Framework API 2.0 beta2, Mini-SQL 1.0.16 and the multimedia equipments, such as SunVideoPlus/Sun Video capture board and Sun Camera. Finally, we showed a numerical data controlled by real-time negotiation and adaptation procedures based on QoS map information to GUIs on client and server dynamically, while our distributed QoS management system is executing a given streaming service.

Implementation of QoS Control Function in SIP based VoIP System (SIP 기반 VoIP 시스템에서 QoS 제어기능 구현)

  • 라정환;윤덕호;김영한;김은숙;강신각
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.12
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    • pp.18-26
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    • 2003
  • In this paper, we design and implement a QoS control function in the SIP-based VoIP system. As a network infrastructure for VoIP service, we select the Intserv over Diffserv architecture where the network resources are managed by a call admission control mechanism. The SIP protocol extended to support QoS signaling procedure is modulized to operate independently with the infrastructure. The performance of the QoS-enabled VoIP system is verified by experiments.

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 the Application of Policy-Based Networking for QoS in The Defense Information System (국방정보체계의 서비스 품질(QoS) 보장을 위한 정책기반(Policy-Based)네트워킹 적용에 관한 연구)

  • 김광영;이승종
    • Journal of the military operations research society of Korea
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    • v.29 no.1
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    • pp.57-75
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    • 2003
  • Policy-based networking offers a network manager the ability to manage the network in a holistic and dynamic fashion rather than force a network manager to manage the network by dealing with each device individually. Policy-based networking is focusing on users and applications instead of emphasizing devices and interfaces. An important part of the policy-based networking is to simplify the task of administration and management for different disciplines. The Defense Information System(DIS) of today are complex and heterogeneous systems. Operational needs are not a trivial task and Quality of Service(QoS) is not generally guaranteed. So, important data may be missed or congested by trivial data. Policy-based networking provide a way to support QoS and simplify the management of multiple devices deploying complex technologies. This paper suggest implementation of policy-based networking in DIS to improvement of performance, and implementation is progressed step by step. Especially this paper is focusing on the providing QoS with policy-based networking using Lightweight Directory Access Protocol(LDAP) Server.

A Design and Implementation of MPLS Based Wireless Mesh Network (MPLS기반 메쉬 네트워크 설계 및 구현)

  • Kim, Young-Han;Kim, Jeong-Myun
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.2
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    • pp.103-111
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    • 2011
  • Recently, wireless mesh networks are used in various application areas. However, wireless mesh networks have limited bandwidth by the wireless transmission property, and have severe throughput degradation in multi-hop transmission in single channel wireless mesh networks. To solve this problem and support QoS, a lot of routing protocols have been proposed in mesh networks. In this paper, we propose a wireless mesh networks architecture with MPLS for QoS service. The path and traffic management from the application could be independent from QoS routing protocols by using the MPLS in wirelss mesh networks. In this paper, we design a MPLS-based mesh router with IEEE 802.11e for traffic differentiation and investigate the operation by implementation and test.

A transmit function implementation of wireless LAN MAC with QoS using single transmit FIFO (단일 송신 피포를 이용한 QoS 기능의 무선랜 MAC의 송신 기능 구현)

  • Park, Chan-Won;Kim, Jung-Sik;Kim, Bo-Kwan
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.237-239
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    • 2004
  • Wireless LAN Voice over IP(VoIP) equipment needs Quality-of-Service(QoS) with priority for processing real-time traffic. This paper shows transmit function implementation of wireless LAN(WLANs) media access control(MAC) support VoIP, and it has an advantage of guarantee of QoS and is adaptable to VoIP or mobile wireless equipment. The IEEE 802.11e standard in progress has four queues according to four access categories(AC) for transmit and the MAC transmits the data based on EDCA. The value of AC is from AC0 to AC3 and AC3 has the highest priority. The transmit method implemented at this paper ensure QoS using one transmit FIFO in hardware since real-time traffic data and non real-time traffic data has the different priority. The device driver classifies real-time data and non real-time data and transmit data to hardware with information about data type. The hardware conducts shorter backoff and selects faster AIFS slot for real-time data than it for non real-time data. Therefor It make give the real-time traffic data faster channel access chance than non real-time data and enhances QoS.

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