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<p><img class="alignleft size-full wp-image-3492" title="Video-Aware white paper" src="http://www.interdigital.com/wp-content/uploads/2012/10/Video-Aware-white-paper1.jpg" alt="" width="150" height="95" />The demand for wireless data is growing rapidly, with a substantial component of this growth due to the proliferation of multimedia traffic (and in particular video applications) delivered to smartphones over Wi-Fi&reg; and cellular data networks.&nbsp; Real-time <a href="http://www.interdigital.com/video" target="_blank">video over wireless</a>&nbsp; is expected to become a bigger component of the overall multimedia traffic as LTE begins to enable the use of video conferencing over cellular networks.&nbsp; This growth will outpace the capacity of wireless networks and will necessitate the use of more &lsquo;out-of-the-box&rsquo; approaches to managing the data onslaught.&nbsp; In particular, cross-layer optimization of the wireless networks to exploit the unique nature of video traffic as well as optimization of the video applications for transport over today&rsquo;s congested wireless networks can deliver substantial gains in both network efficiency and user perceived Quality of Experience (QoE).</p>
<p><a href="http://www.interdigital.com/wp-content/uploads/2012/10/Video-Aware-Link-Adaption-White-Paper_InterDigital_Oct2012.pdf" target="_blank">The InterDigital white paper, titled Video-Aware Link Adaption</a>, describes several ways in which the performance of video delivery may be enhanced through cross-layer optimization, making the underlying networks aware of the applications they are supporting and making the applications aware of the networks on which they are running.</p>
<p>The paper outlines two cross-layer approaches to video performance optimization over LTE networks that leverage the structure of real-time video in performing link-adaptation in the MAC/PHY layers at the basestation (Class 3).&nbsp; These approaches include adaptation of Hybrid-ARQ (HARQ) retransmission as well as multi-user scheduling to improve overall user QoE and network efficiency.&nbsp; These techniques may provide very meaningful improvements in the end user&rsquo;s perceived QoE (more than 4dB PSNR) while requiring minimal changes to the network.</p>