New white paper illustrates how Video-Aware Link Adaption technologies enhance real-time video over LTE
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® and cellular data networks. Real-time video over wireless 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. This growth will outpace the capacity of wireless networks and will necessitate the use of more ‘out-of-the-box’ approaches to managing the data onslaught. 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’s congested wireless networks can deliver substantial gains in both network efficiency and user perceived Quality of Experience (QoE).
The InterDigital white paper, titled Video-Aware Link Adaption, 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.
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). These approaches include adaptation of Hybrid-ARQ (HARQ) retransmission as well as multi-user scheduling to improve overall user QoE and network efficiency. These techniques may provide very meaningful improvements in the end user’s perceived QoE (more than 4dB PSNR) while requiring minimal changes to the network.