Performance and dimensioning of a hierarchical video storage network for interactive video services

Bianchi, Giuseppe; Melen, Riccardo

doi:10.1002/ett.4460070407

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…Unlike related work [3,19,20], we focus on the I/O bandwidth requirements of the servers, and consider that as the most critical resource, instead of the storage and communication costs. We believe that this choice is justified given the present technology trends [21].…”

Section: Our Overall Approachmentioning

confidence: 98%

“…For this reason, we will study a hierarchical architecture for the VOD distribution network which fits the existing tree topology used in today's cable TV distribution networks. Similar to [3,19,20], the distribution network topology is considered to be an r-ary tree associating a number of video servers and switching nodes connected via communication links. Referring to Fig.…”

Section: Technological Infrastructurementioning

confidence: 99%

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Video placement and configuration of distributed video servers on cable TV networks

2000

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A large-scale, distributed video-on-demand (VOD) system allows geographically dispersed residential and business users to access video services, such as movies and other multimedia programs or documents on demand from video servers on a high-speed network. In this paper, we first demonstrate through analysis and simulation the need for a hierarchical architecture for the VOD distribution network.We then assume a hierarchical architecture, which fits the existing tree topology used in today's cable TV (CATV) hybrid fiber/coaxial (HFC) distribution networks. We develop a model for the video program placement, configuration, and performance evaluation of such systems. Our approach takes into account the user behavior, the fact that the user requests are transmitted over a shared channel before reaching the video server containing the requested program, the fact that the input/output (I/O) capacity of the video servers is the costlier resource, and finally the communication cost. In addition, our model employs batching of user requests at the video servers. We study the effect of batching on the performance of the video servers and on the quality of service (QoS) delivered to the user, and we contribute dynamic batching policies which improve server utilization, user QoS, and lower the servers' cost. The evaluation is based on an extensive analytical and simulation study.

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Section: Our Overall Approachmentioning

confidence: 98%

Section: Technological Infrastructurementioning

confidence: 99%

Video placement and configuration of distributed video servers on cable TV networks

2000

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“…To account for such a nonstationarity of the viewing probabilities associated to a program, we have employed a nonstationary token model, first introduced in [14] and refined in [22]. Here, a number of permissions is associated to each program.…”

Section: Traffic Model and System Parametersmentioning

confidence: 99%

“…Therefore, in recent years, several network and server architectures, based on hierarchical storage systems, have been proposed [9]- [13], and the related performance and dimensioning issues have been considered [14]- [18].…”

Section: Introductionmentioning

confidence: 99%

The role of local storage in supporting video retrieval services on ATM networks

Bianchi

Melen

1997

IEEE/ACM Trans. Networking

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This paper studies a reference network architecture for video information retrieval, based on hierarchical storage of the video segments and asynchronous transfer mode (ATM) transport capability on the long distance network. The storage associated to local switching nodes can be exploited in two complementary ways, either for caching the most requested video programs, and for decoupling the transmission speed on the long distance network from the natural playout speed of the video segments. We show that both approaches lead to a substantial increase of the load carried on the long distance network with a given service requirement. Moreover, we show that a greater efficiency is obtained when a suitable integration of the two approaches is considered.

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“…Particularly, for video applications, the case we are interested in, several network architectures have been developed that enable users to have access to a wide range of video programs on demand. In the following sections we examine a hierarchical architecture for a VoD distributed network, which fits the existing tree topology used in today's cable TV systems [2], [18], [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of the Deadline Credit Scheduling Algorithm for Soft-Real-Time Applications in Distributed Video-on-Demand Systems

Alexandraki

Paterakis

2005

Cluster Comput

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Video-on-Demand (VoD) systems are expected to support a variety of multimedia services to the users, such as tele-education, teleconference, remote working, videotelephony, highdefinition TV, etc. These applications necessitate abundant bandwidth and buffer space as well as appropriate software and hardware for the efficient manipulation of the network's resources.In this work we investigate a promising scheduling algorithm referred to as the Deadline Credit (DC) algorithm, which exploits the available bandwidth and buffer space to serve a diverse class of prerecorded video applications. We provide simulation results when the DC algorithm is applied to a hierarchical architecture distributed VoD network, which fits the existing tree topology used in today's cable TV systems. The issues investigated via the simulations are: the system utilization, the influence of the buffer space on the delivered Quality of Service, and the fairness of the scheduling mechanism. We examine cases with homogenous as well as diverse video streams, and extend our system to support interactive VCR-like functions. We also contribute a modification to the DC algorithm so that in cases when the video applications have different displaying periods, the video streams obtain a fair share of the network's resources. Finally, we validate our results by simulating actual videos encoded in MPEG-4 and H.263 formats.Keywords: Scheduling video applications, distributed VoD systems, MPEG-4, H.263, VCR-like operations. IntroductionTelecommunication networks have lately extended to support a variety of services to the users such as tele-education, teleconference, remote working, videotelephony, high-definition TV, web video streaming, etc. These applications dictate the need for high-speed networks, and also necessitate the appropriate software and hardware for the efficient integration of a diverse class of applications with different characteristics. These demanding requirements led to the concept of broadband integrated digital networks (B-ISDN), which are systems of high capabilities that enable the transmission of several different applications.Several research areas have been developed in order to increase the efficiency of the network and keep the Quality of Services (QoS) at a satisfactory level. One significant area that affects the quality provided by the network is the scheduling process. Since several applications should be concurrently serviced, the role of the scheduling process is to select each time the application that should be served next.The applications that telecommunication networks support are generally classified into two categories based on the delay that they can undergo during connection: the real time and the nonreal time applications. Real time applications involve a kind of interactivity and consequently can tolerate no delay. The characteristic of these applications is that the network's resources which provide the services need to be reserved for the duration of the connection. This necessitates ample bandwi...

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Performance and dimensioning of a hierarchical video storage network for interactive video services

Cited by 14 publications

References 11 publications

Video placement and configuration of distributed video servers on cable TV networks

Video placement and configuration of distributed video servers on cable TV networks

The role of local storage in supporting video retrieval services on ATM networks

Performance Evaluation of the Deadline Credit Scheduling Algorithm for Soft-Real-Time Applications in Distributed Video-on-Demand Systems

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