Real-time Demonstration of MPEG-4 based Video Telephony over Wireless Systems using WiNe2

摘要

In this work we present a flexible and fast, but yet accurate simulation environment for wireless systems, which satisfies realtime constraints imposed by the respective applications and protocols of interest. We take into account system and demonstration aspects and concentrate on real-time video-conferencing services. The presented wireless network simulation and demonstration environment (WiNe2) includes several audio-visual applications, the corresponding transport protocols, a network-level simulator, and appropriate server and client software and hardware. We will present details in this work and show the suitability of this environment to test, evaluate, and assess video-conferencing applications over GSM GPRS and EGPRS. Video coding is based on MPEG-4, audio coding uses GSM AMR. Appropriate parameters to allow rate adaptation and error resilience are integrated in the multimedia encoding and decoding algorithms. Screenshots and subjective observations are discussed in the paper, while the entire demonstration platform for this specific application will be presented online at the conference.