Abstract
We present an efficient method for supporting wireless video multicast services. One of the main goals of wireless video multicast services is to provide priority including dedicated bandwidth, controlled jitter (required by some real-time and interactive traffic), and improved loss characteristics. The proposed method is based on storing multiple differently encoded versions of the video stream at the server. The corresponding video streams are obtained by encoding the original uncompressed video file as a sequence of I-P(I)-frames using a different GOP pattern. Mechanisms for controlling the multicast service request are also presented and their effectiveness is assessed through extensive simulations. Wireless multicast video services are supported with considerably reduced additional delay and acceptable visual quality at the wireless client-end.
Highlights
Multimedia transport typically requires stringent QoS metrics
It is difficult to (a) W[u, v] with low slope (b) W[u, v] with high slope do subjective rating because it is not mathematically repeatable. For this reason we measure the visual quality of the interactive mode using the peak signal-to-noise ratio (PSNR)
We use the PSNR of the Y -component of a decoded frame
Summary
Multimedia transport typically requires stringent QoS metrics (bandwidth and delay and jitter guarantees). The rapid growth of wireless communications and networking protocols will bring video to our lives anytime, anywhere, and on any device. Until this goal is achieved, wireless video delivery faces numerous challenges, among them highly dynamic network topology, high error rates, limited and unpredictably varying bit rates, and scarcity of battery power. Emerging and future wireless systems will provide sufficient bit rates to support video communication applications. Bit rates will always be scarce in wireless transmission environments due to physical bandwidth and power limitations; efficient video compression is required [1, 2]
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