A. Campbell and G. Coulson, \A Quality of Service Architecture," ACM Computer Communications Review, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... quality adaptation techniques were investigated at length in the multimedia community, for example, in the dynamic distillation architecture by Fox [28] and the active services framework for multimedia transcoding [11, 10] Adaptive QoS frameworks for multimedia systems include the QoS A framework [22], the Heidelberg QoS model [53] Vnet [27] NetWorld [25] the QoS adaptation model of [8] COMETS Extended Integrated Reference Model (XRM) 37] the OMEGA end point architecture [45] and the QoS Broker [44] Odyssey [46] presents a framework for experimenting with application aware adaptation ....

A. Cambell, G. Coulson, and D. Hutchison. A quality of service architecture. ACM Computer Communications Review, April 1994.

....in estimating application resource requirements. In [14] a dynamic distillation method is proposed to adapt to network and client variability via on line compression techniques. In the multimedia community several systems were described with adaptive QoS. Examples include the QoS A framework [10], the Heidelberg QoS model [39] V net [13] NetWorld [12] the QoS adaptation model of [4] COMETS Extended Integrated Reference Model (XRM) 20] the OMEGA end point architecture [24] and the QoS Broker [23] Odyssey [26] presents a framework for experimenting with application aware ....

A. Cambell, G. Coulson, and D. Hutchison. A quality of service architecture. ACM Computer Communications Review, April 1994.

....the processes. A distributed multimedia application may involve various QoS requirements from the network[8] In this paper, we concentrate on scheduling processes at the end host based on their resource requirements. We assume that the network o#ers the required QoS for the various processes[9]. We obtain the resource abstraction of a distributed process at a single node and consider this abstraction to be the requirements of a local process at the node. 3 Resource Manager Every multimedia application has certain minimum resource requirements to be satisfied for optimum performance. ....

A.Campbell, G.Coulson and D.Hutchison, A Quality of Service Architecture, ACM Computer Communications Review, April 1994.

....to the communication protocols. Table 1 presents a summary of the congestion control architecture, that enumerates the functions and mechanisms of each architectural plane. This multi dimensional approach to congestion control can also be found in other proposals [Woodruff 88, Ramamurthy 91, Campbell 94] with different planes and functionality. We believe that our framework is more general and best suited to the congestion definition and metric proposed in the first section of this paper. 3. CONCLUSION This paper presented an architectural framework for the problem of congestion control in ....

Andrew Campbell, Geoff Coulson and David Hutchison, A Quality of Service Architecture, ACM Computer Communication Review, Volume 24 (2), pp. 6-27, April 1994.

....(2.1 and 2.2) successively present the architecture defined at the end to end level and then at the network level. 2. 1 End to end level The basic underlying principle that supports the proposal of the IRS end to end architecture is one of many dedicated to the transport of multimedia flows [9,10,11,12]. The idea is that the traffic exchanged within a distributed application can be decomposed into several data flows each one requiring its own specific QoS (i.e. delay, reliability, order, That is, each application can request a specific QoS for each flow via a consistent API (Application ....

Campbell, A., Coulson, G., Hutchinson, D.: A quality of service architecture. ACM Computer Communication Review (1994).

....limitations such as inaccuracies in estimating application resource requirements. In [13] a dynamic distillation method is proposed to adapt to network and client variability via on line compression techniques. In the multimedia community several systems were described with adaptive QoS as well [3, 7, 10, 12, 18, 19, 24, 26, 42]. A good survey of such architectures can be found in [5] While these approaches are more flexible in that they allow adaptation, they still share in common with their predecessors the need to know the resource requirements of tasks. We envision a fourth paradigm for real time scheduling that ....

A. Cambell, G. Coulson, and D. Hutchison. A quality of service architecture. ACM Computer Communications Review, April 1994.

....They have to be implemented within an overall QoS architecture. A QoS Architecture should incorporate QoS con gurable interfaces, QoS driven control and management mechanisms across all architectural layers [14, 13] There have been some relevant Frameworks such as: QoS A (Lancaster University, [1]) QualMan and OMEGA (University of Pennsylvania, 42, 34] qStack (Columbia University, 32] CME (Berkeley University, 5] The approaches adopted by these research projects are discussed in this work. Furthermore, the Internet community have been working on implementing TCP IP over ATM, but ....

....specify at least the trac class. The ORB sets the max bandwidth value to the maximum possible value in order to accept all incoming connections with the same trac class. AIOP: TagQosList l= new AIOP: TagQosList( l length(2) l) 0] tag = 1; l) 0] qos.traffic class = 2; CBR ( l)[1].tag = 2; l) 1] qos.traffic class = 2; CBR CORBA: ORB ptr orb = CORBA: ORB init(argc,argv, omniORB2 ,l) CORBA: BOA ptr boa = orb BOA init(argc,argv, omniORB2 BOA ,l) CHAPTER 2. IMPLEMENTATION OF ATM IN OMNIORB2 26 The ORB automatically adds the zero tag to the list because the naming ....

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G. Coulson A. Campbell and D. Hutchison. A Quality of Service Architecture. ACM Computer Communication Review, 24(2):6-27, 1994.

....concentrated on the development of QoS management frameworks or developing adaptive algorithms for specic applications. In this section we will cite two typical examples from each category to highlight the dioeerence with our methodology. 2. 1 QoS architectures The Lancaster QoS Architecture [Campbell94] provides a framework which is based on the concepts of the ISO reference model. The framework consists of 6 layers, and three planes. The lower four layers are equivalent to the lower four layers of the OSI Reference Model with enhanced protocols to support multimedia communications and the ....

A. Campbell, G. Coulson, and D. Hutchison. A Quality of Service Architec ture. ACM Computer Communication Review. April 1994.

....a real time scheduler for Linux [30] and the concept of resource centric kernels [26] Multimedia applications are generally communicationintensive. Several communication related architectures have therefore been proposed to support multimedia QoS guarantees. Examples include the QoS A framework [6], the Heidelberg QoS model [33] V net [8] NetWorld [7] the QoS adaptation model of [3] COMETS Extended Integrated Reference Model (XRM) 16] the OMEGA endpoint architecture [24] and the QoS Broker [23] The design of QoS sensitive operating system communication subsystems has been ....

A. Cambell, G. Coulson, and D. Hutchison. A quality of service architecture. ACM Computer Communications Review, April 1994.

....while a transport system user likes to specify reliability constraints in terms of the percentage of lost transport data units instead of the percentage of lost cells. In [Jung 93] QoS parameters were introduced at the ATM and AAL layer, the requirements at the application layer are described in [Campbell 94] in the form of network QoS parameters [Ferrari 90] while QoS requirements at the user are described in [Hafid 97a, Kalkbrenner 94] in terms familiar to human user such as video color, resolution and image size. More generally the service user specifies values for a list of relevant QoS ....

....entire distributed system must participate in providing the guaranteed performance levels. In recognition of this, a number of QoS architectures have been proposed to provide QoS guarantees. Examples of those architectures are: the Quality of Service Architecture (QoS) A (Lancaster University) Campbell 94] the OSI QoS Framework [ISO 94] the Tenet Architecture (Berkeley University) Ferrari 95] the Heidelberg QoS Model (IBM s European Networking Center) Volgt 95] the MASI End to End Architecture (Universit Pierre et Marie Curie) Tawbi 94] the End System QoS Framework (Washington ....

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A. Campbell, G. Coulson and D. Hutchison, A Quality of Service Architecture, ACM Computer Communication Review, April 1994

.... ffl a commitment value between 0 and 1 expressing the liability of the VPR provider to enforce that the value of the property lies between upper and lower threshold and ffl an adaption type specifying the behaviour when the current value of the property leaves the range given by the thresholds [9]. This specification describes the values where the execution of the service does not clash with the negotiated VPR contract. Some properties of a VPR such as mean or peak throughput, variation of the throughput, response time or availability can only be exactly determined after multiple ....

A. Campbell, G. Coulson, D. Hutchinson. A Quality of Service Architecture. ACM Computer Communications Review, 24(2), 1994.

....services considered concerns mainly data flows; that is, the goal is to establish connections with QoS guarantees between two or more fixed application entities. Examples of QoS architectures which provide QoS guarantees at this level are QoS A, End System QoS Framework and Heidelberg QoS Model [Cam 94, Gop 94, Vol 95] 3) QoS guarantees at the network, transport and end system level including the application layer: These architectures take into account the application requirements in terms of high level QoS parameters, such as image size and audio quality, and make use of resource management ....

A.Campbell, G.Coulson and D.Hutchison, A Quality of Service Architecture, ACM Computer Communication Review, April 1994

....QoS driven communication architecture could be build as follows (cf. fig. 5) An integrated service interface is responsible for handling communication requests from the application streams. These requests carry a stream specific QoS specification. Examples of such specifications can be found in [5]. According to the desired QoS values, a preconfigured, dynamically loadable protocol module is selected from a kernel library and used for the subsequent data transfer. Within the protocol module, the stream oriented QoS values are transformed to link level QoS parameters and passed to the ....

A. Campbell, G. Coulson, and D. Hutchinson. A Quality or Service Architecture. ACM Computer Communication Review, 24(2):6--27, 1994.

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A. Campbell, G. Coulson, D Hutchison.: A Quality of Service Architecture, ACM Computer Communications Review, Volume 24, Number 2, 1994, pp6-27

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Andrew T. Campbell, Geoff Coulson, and David Hutchison. A Quality of Service Architecture. ACM Computer Communications Review, 24(2):6--27, April 1994.

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A. Campbell, H. De Meer, M. Kounavis, K. Miki, J. Vicente, and D. Villela. A survey of programmable networks. ACM Computer Communications Review, pages 7,23, April 1999.

.... in the abstract routing machine can be efficiently implemented (more details in [13] 2 Related Work Much progress has been achieved to introduce programmability on the network level by the main proponents, the DARPA Active Networks research group and the IEEE PIN1520 standardization committee [5]. Much less atten tion, however, has been paid to middleware support and programming languages supporting network programmability. In particular, the shipping of mobile code to remote network nodes in a manageable fashion constitutes a major remaining challenge. The challenge is mainly due to the ....

A. Campbell, H. De Meer, M. Kounavis, K. Miki, J. Vicente, and D. Villela. A survey of programmable networks. ACM Computer Communications Review, April 1999.

....all the routers, or could vary the strategy depending of the di#erent local network states. In general, much progress has been achieved to introduce programmability on the network level by the main proponents, the DARPA Active Networks research group and the IEEE PIN1520 standardization committee [3]. Much less attention, however, has been paid to middleware support and programming languages supporting network programmability. In particular, the shipping of mobile code to remote network nodes in a manageable fashion constitutes a major remaining challenge. The challenge is mainly due to the ....

A. Campbell, H. De Meer, M. Kounavis, K. Miki, J. Vicente, and D. Villela. A survey of programmable networks. ACM Computer Communications Review, April 1999.

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Campbell, A.T., Coulson, G. and Hutchison, D., A Quality of Service Architecture, ACM Computer Communications Review, April 1994.

....issue, requiring all resources used by an application to be considered. As well as the CPU, this may include physical memory, network, disk, framebu er and I O bus bandwidth. Many researchers have recognized the need for QoS support, and have 15 proposed QoS Architectures, such as QoS A [Campbell94, Campbell93] XRM [Lazar94] TINA [Nilson95] and CESAME [Besse94] These architectures endeavour to supply applications with an API for specifying and negotiating their QoS requirements. They aim to provide a software structure through which these high level application speci cations can be ....

Andrew Campbell, Geo Coulson, and David Hutchison. A Quality of Service Architecture. ACM Computer Communications Review, 24(2):6-27, 1994. (p 16)

....the benefit of 3 applications or application classes, as long as this would not compromise usability, performance and security of the network and its services as a whole. While network programmability is attracting increasing attention, its state of development is still at its infancy [16] 23] [9]. Meanwhile, pragmatic approaches have been suggested to use JAVA as an, albeit inefficient, vehicle for rapid prototyping of network protocols and software agent systems. Based on a system independent application platform, code can be dynamically downloaded and can actually roam the network in ....

....accepting occational quality disturbances, or may even prefer to implement a type of service of its own that has not been standardized at all. A framework for architecting network resources based on programmable networks has been suggested earlier, applying the paradigm of spawning network [10] [9], 8] We follow a similar perspective, but use our agent based platform MAP [24] instead for rapid prototyping of network services, thus allowing for a faster time scale of service deployment. A major incentive for an agent based approach is that policies can be implemented dynamically, allowing ....

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A.T. Campbell, H.G. De Meer, M.E. Kounavis, K. Miki, J. Vicente, and D. Villela. A Survey of Programmable Networks. ACM Computer Communication Review, 29(2):7--23, April 1999.

.... on realtime communication protocols [2, 10, 18, 21] network support for QoS [6, 19] and real time operating system support [9, 12, 15, 17] We address end host design that supports a QoS adaptive service model [1, 4, 7, 8] Unlike integrated end to end architectures geared towards multimedia QoS [3, 5, 16, 20], we focus on providing appropriate QoS guarantees for both soft and hard realtime applications by the composition of individuallydesigned independent components. In this approach the desired end to end behavior is achieved by composing several independent resource management modules (for ....

A. Cambell, G. Coulson, and D. Hutchison. A quality of service architecture. ACM Computer Communications Review, April 1994.

No context found.

A. Campbell and G. Coulson, \A Quality of Service Architecture," ACM Computer Communications Review, 1994.

No context found.

A. Campbell, G. Coulson and D. Hutchson, A Quality of Service Architecture, ACM Computer Communications Review, Volume 24, Number 2, 1994.

No context found.

Andrew T. Campbell, Herman G. De Meer, Michael E. Kounavis, Kazuho Miki, John B. Vicente, and Daniel Villela. A Survey of Programmable Networks. ACM Computer Communications Review, 29(2):7--23, April 1999.

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