Daniel Waddington, Geoff Coulson and David Hutchison "Specifying QoS for Multimedia Communications within Distributed Programming Environments" Proceedings of the 3rd International COST237 Workshop: Multimedia Telecommunications and Applications, Lecture Notes in Computer Science Volume 1185, Barcelona, Spain, 25-27 November 1996, pp104-130  Home/Search   Document Details and Download   Summary   Related Articles   Check

....but it is essentially distributed to a diverse set of QoS characteristics. In other words, perceivable QoS should not be judged only by parameters like packet loss, bandwidth, delay or delay jitter, rather these have to be looked upon as just a subset of the overall set that characterize QoS [15]. A sound description of the QoS architecture is essential to understand its dependencies at various levels and highlight upon issues that require further investigation. Consideration of all such issues would then derive a relevant approach towards proper QoS management from the Internet. The ....

Daniel Waddington, Geoff Coulson and David Hutchison "Specifying QoS for Multimedia Communications within Distributed Programming Environments" Proceedings of the 3rd International COST237 Workshop: Multimedia Telecommunications and Applications, Lecture Notes in Computer Science Volume 1185, Barcelona, Spain, 25-27 November 1996, pp104-130

....(resource allocation due to used transport) So the binding of a QoS parameter to a specific resource is the duty of a QoS implementor. The implementor can rely on work already done when implementing these bindings[9] The assignment of a QoS to a service can be realized in different granularity[10] (i.e. per interface, per method etc) Our approach is to assign QoS to interfaces. An object implementation is restricted to one specific QoS at a time. This has to be ensured in the implementation when using activation modes like shared 3 . Thus, conflicts between concurrent QoS (like ....

D. C. Waddington, G. Coulson, D. Hutchinson, "Specifying QoS for Multimedia Communications within Distributed Programming Environments," Multimedia Telecommunications and Applications, Springer LNCS 1196, pp. 75-101, 1996

....noted that this ability Current address: Department of Computational Science, National University of Singapore. to scale down the level of service is not present in traditional scheduling problems, where a job is either serviced or rejected. Our work has some bearing on current research (e.g. [4, 13]) in integrated network services where the concept of Quality of Service (QoS) is of paramount concern. Traditional internet services such as email and ftp are based on point to point remote procedure calls that use a best effort delivery scheme, resulting in variable latency for message ....

D. G. Waddington, G. Coulson, and D. Hutchinson. Specifying QoS multimedia communication within distributed programming environments. Multimedia, Telecommunications and Applications: Proc. 3rd Int'l. COST 237 Workshop, pages 104--130, Nov 1996. Lecture Notes in CS No.1185.

....for flow establishment, QoS negotiation, QoS mapping, and QoS re negotiation, that is, coarse adaptation; and the QoS maintenance plane is in charge of the fine grained maintenance of the QoS levels of a flow within the QoS range established for that flow. Other architectures are discussed in [Waddington 96] and [Li 97] but the original concept of layering remains the same. Thus, the QoS management for distributed multimedia systems becomes more complex because different layers have to be considered, each one having its own QoS parameters. A scheme of the layered structure is presented in Figure 1 ....

....and [Li 97] but the original concept of layering remains the same. Thus, the QoS management for distributed multimedia systems becomes more complex because different layers have to be considered, each one having its own QoS parameters. A scheme of the layered structure is presented in Figure 1 [Waddington 96] and [Nahrstedt 95] Figure 1. Layered structure for QoS management The end user is concerned with the perceptual QoS in the sense of how good he she perceives what the application is showing. These parameters are qualitative and highly dependent on each user. For example, in case of video some ....

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Waddington D.G., Coulson G., and Hutchinson D. `Specifying QoS for Multimedia Communications within Distributed Programming Environments'. Proceedings of the Third COST 237 Workshop. Multimedia Telecommunications and Applications. Barcelona. pp. 75-103, November 1996.

....interface which contains the operations of a QoS visible at its interface. 1 Which in fact implicitly weaves the QoS with the other generated elements of the interfaces 3 QIDL 4 An important question is, which elements in the system QoS can be assigned to. There are several possible elements[11] a QoS can be assigned to. We restrict QoS assignment to interfaces. Finer granularity, e.g. operations or parameters, may conflict when using different QoS, like replica groups and best effort communication. Assigning QoS to modules is unnecessary coarse and may be too restrictive. An interface ....

D. C. Waddington, G. Coulson, D. Hutchinson, "Specifying QoS for Multimedia Communications within Distributed Programming Environments," Multimedia Telecommunications and Applications, Springer LNCS 1185, pp. 75-101, 1996

....running over the Chorus micro kernel and with a non real time profile over generic operating systems. Furthermore, the environment comprises a set of generic services, including configuration and management tools. 6. 2 MMN Project (BT URI) The Management of Multiservice Networks (MMN) project [Waddington 96] is a British Telecom University Research Initiative (BT URI) which comprises a five year plan for six research institutions, focusing on the development of a set of management tools to perform management functions in a multi domain environment using integrated services networks (basically ATM) ....

D. Waddington, G. Coulson and D. Hutchinson, "Specifying QoS for Multimedia Communications within a Distributed Programming Environment", Distributed Multimedia Research Group, Tech. Report MPG-2-08-96

....QoS is assumed of the Remote Procedure Call (RPC) mechanisms. This level of assumed QoS for control invocations is evident within distributed object environments such as CORBA, which do not provide the application programmer with the ability to specify a QoS requirement for individual invocations [Waddington, 96] However, in multimedia processing environments where time critical data handling and control are essential, the ability for an application programmer to request QoS requirements for an individual control invocation may indeed be necessary. The TINA consortium s Object Definition Language (ODL) ....

D.G.Waddington, G.Coulson and D.Hutchison, "Specifying QoS for Multimedia Communications within Distributed Programming Environments", Third International COST237 Workshop, Barcelona, Spain, Springer Series LNCS 1185, p.75-101, November 1996.

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D.G.Waddington, G.Coulson and D.Hutchison, "Specifying QoS for Multimedia Communications within Distributed Programming Environments", Multimedia Telecommunications and Applications, Springer LNCS 1185, p.75-103, Nov 1996.

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D.G.Waddington, G.Coulson, and D.Hutchison, "Specifying QoS for Multimedia Communications within Distributed Programming Environments", Proc. of the 3 rd International COST237 Workshop. LNCS 1185, Barcelona, Nov. 1996

No context found.

D. G. Waddington, G. Coulson, and D. Hutchinson. Specifying QoS multimedia communication within distributed programming environments. Multimedia, Telecommunications and Applications: Proc. 3rd Int'l. COST 237 Workshop, pages 104--130, Nov 1996. Lecture Notes in CS No.1185.

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