We describe a method for managing the Quality of Service (QoS) of the Virtual Reality Modeling Language (VRML) browser. We implemented a QoS management capability in a VRML 2.0 browser that we developed, called the Reactive Virtual Environment (RVE) browser. The QoS management consists of two layers: (1) a resource allocation layer, which manages the CPU allocation and execution control by means of a scheduling algorithm, and (2) the service adaptation layer, which provides best-effort services under the allocated CPU resource by automatically selecting the level of detail (LOD) of 3D scenes and adjusting the frame rate. The QoS management by this two-layer approach guarantees the real-time nature of the system response and causes graceful degradation of the QoS when system resources are limited. We demonstrate experimentally that the two-layer approach is very effective for dynamic 3D and multimedia applications.
By: Tatsuo Miyazawa, Masaaki Taniguchi, Ryo Yoshida, Masaaki Murao
Published in: RT0291 in 2002
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