Adaptive QoS Management for Multimedia Applications in Heterogeneous Environments: A Case Study with Video QoS Mediation (Special Issue on New Paradigms in Network Management)
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概要
- 論文の詳細を見る
In this paper we present a Quality of Service (QoS) management architecture for distributed multimedia applications in heterogeneous communication environments of wired and wireless networks. Gaps in network performance such as bandwidths and errorrates between wired and wireless networks, as well as gaps in terminal performance in media handling between desktop computers and handheld computers, bring about heterogeneities. Furthermore, even performance gaps among various desktop computers cause heterogeneities. As a result of these heterogeneities in network and terminal performances and various user preferences, the QoS requirement from each receiver is different. Therefore, mechanisms that adjust and satisfy each QoS requirement are needed. We propose a proxy server called Communication Coordination Server (CCS), which intermediates a video server and a receiver and manages the QoS coordination. The CCS performs QoS admission, adjustment, and allocation mechanisms to satisfy the user's QoS requirement. Then transcoding is used to realize the allocated QoS, and it decodes the input video stream from the video server and encodes it within the CCS. A QoS mapping mechanism that translates application-level QoS into resource-level QoS is needed for the QoS admission. We also propose a new QoS mapping mechanism using spline functions that enables a continuous QoS translation. We have built a CCS prototype in our laboratory testbed, and have verified that the CCS can resolve the heterogeneities between the server and receiver by the QoS adjustment mechanism of the transcoding and the QoS admission.
- 社団法人電子情報通信学会の論文
- 1999-11-25
著者
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Yamazaki Tatsuya
Atr Adaptive Communications Research Laboratories
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Matsuda Jun
Atr Adaptive Communications Research Laboratories
関連論文
- A Scalable Resource Allocation Scheme over DiffServ towards End-to-end QoS Assurance(Special Issue on Network Software)
- Spline-based QoS Mapping Mechanisms for Hierarchical Multilevel QoS Models(Special Section on Papers Selected from ITC-CSCC 2001)
- Adaptive QoS Management for Multimedia Applications in Heterogeneous Environments: A Case Study with Video QoS Mediation (Special Issue on New Paradigms in Network Management)