Real-time demonstration of MPEG-4 based video telephony over wireless systems using WiNe2

In this work we present a flexible and fast, but yet accurate simulation environment for wireless sys-tems, which satisfies real-time 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 dis-cussed in the paper, while the entire demonstration platform for this specific application will be pre-sented online at the conference.