Real-time communication services in a DQDB network

Carmo,; Vasques, Francisco; Juanole,

doi:10.1109/real.1994.342711

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…This timeliness depends on the timeliness of the computations (beginning, duration), of the message productions and consumptions, and of the message exchanges (sending on the network, reception from the network). A lot of works have been done in the last decade, particularly, on scheduling and ressource management (Stankovic and Ramaritham, 1988 ;Tilborg and Koob, 1991 ;Rajkuman, 1991 ;Montuschi et al, 1992 ;Malcolm and Zhao, 1995 ;Sevcik and Johnson, 1994 ;Tindell and Hansson, 1994 ;Carmo et al, 1994) both in terms of algorithms for tasks and messages, and of performances. All these works are mainly concentrated on a particular point in a distributed system and then give partial informations on the distributed system.…”

Section: Introductionmentioning

confidence: 99%

Quality of Service of Communication Networks and Distributed Automation: Models and Performances

Juanole

2002

IFAC Proceedings Volumes

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Section: Introductionmentioning

confidence: 99%

Quality of Service of Communication Networks and Distributed Automation: Models and Performances

Juanole

2002

IFAC Proceedings Volumes

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Design, implementation, and experiences of the OMEGA end-point architecture

Nahrstedt

Smith

1996

IEEE J. Select. Areas Commun.

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New cell-switched network technologies and multimedia peripherals enable distributed applications with strict real-time requirements such as remote control with feedback. Time-bounded network communications services are necessary, but not sufficient, to meet application-to-application real-time requirements. Real-time communication must be coupled with real-time computing support at the network end-points. An end-point architecture for the computation/communications coupling must be flexible and robust to support a diversity of applications.The OMEGA architecture, when coupled with cell-switched networks (or others which can make bandwidth and delay guarantees), can approximate the behavior of dedicated microcontrollers connected by dedicated circuits in support of an application. The essence of the OMEGA architecture is resource reservation and management within the set of multimedia endpoints. Communications is preceded by a call set-up period where requirements, expressed in terms of Quality of Service (QoS) parameters, are negotiated, and guarantees are made at several logical levels, such as between applications and the network subsystem, applications and the operating system, and the network subsystem and the operating system. This establishes customized connections and allocation of resources appropriate to the application requirements and OS/ network capabilities. To facilitate this resource management process, a new paradigm called the 'QoS Brokerage' is used. This paradigm requires new services and protocols across all layers of the protocol stack (i.e., the higher layers of B-ISDN), as well as re-architecting the application/network interface.A prototype of OMEGA has been implemented and tested with a master/slave telerobotics application using a dedicated 155 Mbps ATM LAN. This application employs media with highly diverse QoS requirements and therefore provides a good platform for testing how closely one can approximate a dedicated circuit and controller with workstation hosts and cell-switching. Experience with this implementation has helped to identify new challenges to extending these techniques to a larger domain of applications and systems, and raises several new research questions. A b s t r a c t New cell-switched network technologies and multimedia peripherals enable distributed applications with strict real-time requirements such as remote control with feedback. Timebounded network communications services are necessary, but not sufficient, t o meet applicationto-application real-time requirements. Real-time communication must be coupled with real-time computing support at the network end-points. An end-point architecture for this computation/communications coupling must be flexible and robust to support a diversity of applications.The OMEGA architecture, when coupled with cell-switched networks (or others which can make bandwidth and delay guarantees), can approximate the behavior of dedicated microcontrollers connected by dedicated circuits in support of an application. The essence...

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A CORBA-based quality of service management framework for distributed multimedia services and applications

Hong

Kim²,

Park³

1999

IEEE Network

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For distributed multimedia services, it is essential that quality of service be guaranteed systemwide, including end systems, communication systems, and networks. Although many researchers have addressed issues of QoS mana ement, little attention has so far been paid to the QoS management services in Jstributed multime dia services and applications. To address this deficiency, we have designed a layered model for end-to-end QoS management called the QoS management framework. Our framework, which is CORBA-based, includes a eneric QoS MIB ed to perform various QoS functions. A key component of this framework is the QoS Management Service Object, which orchestrates resources at endpoints, coordinating resource management across layer boundaries. Services such as translation, monitoring, admission, and negotiation are provided by the QMSO. To validate this concept, we have developed a QoS management system for managing and controlling the QoS of a distributed multimedia system called MAESTRO. The QoS management system has been implemented through CORBA objects and provides an interface to multimedia applications, which can be used for dynamic negotiation and renegotiation of QoS by users. Some performance results in QoS negotiation and renegotiation are also presented.for the QoS parameterization of various multimedia services and 4i t e services needhe widespread use of distributed multimedia applications is setting forth a new set of challenges in networking, including management of network resources in order to guarantee quality of service (QoS) [l-31. As users become more familiar with multimedia services, QoS must be approached from the user's perspective as well as from the system or network perspective which has mainly been addressed so far [4-71. The user must be given the opportunity to express hislher requirements for receiving service in terms of QoS parameters familiar to himher. In turn, these parameters can then be translated into parameters provided by the underlying systems and networks, satisfying the user's needs [8].Distributed multimedia services and applications are timecritical and need management support for ensuring the QoS agreed upon by the user and provider [9, 101. An important aspect of these services is that they require QoS guarantees for the transfer and processing of continuous media data (e.g., video and audio). Emerging networks such as asynchronous transfer mode (ATM) [ l l ] and the proposed integrated services with reservations [12-141 can, to a certain extent, provide guarantees on bandwidth and delay for data transfer. Also, modern computer systems now have sufficient processing power and I/O bandwidth to handle continuous media. In such distributed multimedia computing environments, management has to promote QoS guarantees for each level of the system because the overall QoS depends on the combined QoS of the underlying systems and networks [15].The end-to-end management, therefore, has to include management capabilities for each layer participating in the delivery of the serv...

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Real-time communication services in a DQDB network

Cited by 7 publications

References 8 publications

Quality of Service of Communication Networks and Distributed Automation: Models and Performances

Quality of Service of Communication Networks and Distributed Automation: Models and Performances

Design, implementation, and experiences of the OMEGA end-point architecture

A CORBA-based quality of service management framework for distributed multimedia services and applications

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