Abstract

Despite the evolution of high-speed communication network to accommodate an increasingly number of applications with diverse service requirements, there still exist a number of barriers related to the deployment of the encoded video over the ATM network. In fact, additional works have to be devoted to improve protocol architecture and to guarantee the QoS. In this paper, we first analyze the main parameters affecting the visual quality of real video pictures. Then, we define specific services to be implemented at the network interface level. We also discuss the proposed integrated protocols architecture for real time application such as video coding illustrating the function to support the challenges of managing real time services over high speed network. In fact, data cells are exposed to delays and losses, which affect the quality of the video signal. Therefore, we have to perform the adequate processing in order to keep the quality of service on an acceptable level. In this article, we propose the design of an interface between the MPEG-2 standard and the ATM network in order to improve the video visual quality. Our approach tries to overcome the difficulty imposed by traditional random cell discarding due to the bursty aspect of the traffic and the variable bit rate (VBR) transmission, nature of compressed video. The performance evaluation shows the effectiveness of the proposed interface architecture with the set of mechanisms in improving the robustness of the video delivery system.

Author Keywords: Asynchronous transfer mode; Motion picture expert group; Quality of service

Article Outline

1. Introduction

1.1. Basic concepts

2. Analysis of parameters affecting picture quality

2.1. Data losses due to cell errors

2.2. Data losses due to burstiness

3. Network integrated protocol architecture issues: specific service definition

3.1. Proactive network control policies: traffic management algorithm

3.2. Dynamic memory management

3.3. A new MPEG-2 video stream encapsulation strategy

3.4. Reactive policy: the interleaving technique

4. Integrated protocol architecture

4.1. Target model

4.2. Architectural configuration

4.2.1. Network interface unit (Chopper)

4.2.2. Microprocessor interface unit (microprocessor interface)

4.2.3. The integrated protocol unit

4.2.3.1. The main state machine (controller)

4.2.3.2. The secondary state machine

4.2.3.3. The data path

5. Architecture synthesis

5.1. Design results

6. Performance evaluation

6.1. Qualitative evaluation of the integrated protocol with flow control algorithm

6.2. Quantitative evaluation of the integrated protocol with flow control algorithm

7. Conclusion

References

Vitae

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