1. Copyright © 2011, MBL@CS.NCTU Quality-Driven Cross-Layer Optimized Video Delivery over LTE IEEE Communications Magazine, FEB 2010 Speaker: 劉姿瑾 Date: 25, JUL 2012

2. Copyright © 2011, MBL@CS.NCTU Outline Introduction Objective System Overview –Cross-Layer Optimized System –Dynamic Resource Allocation - WRR Experimental Analysis Conclusions References

3. Copyright © 2011, MBL@CS.NCTU Introduction Application-oriented QoS for video delivery have been largely ignored. Higher data rate could lead to higher packet loss rate –Degrading the user-perceived video quality. A new QoS-aware LTE OFDMA scheduling algorithm: –LTE downlink –Real-time video –Best user-perceived video quality –Under the given application delay constraint. A cross-layer system to optimize video delivery.

4. Copyright © 2011, MBL@CS.NCTU Objective Under given QoS constraints, dynamically allocating resources and choosing system parameters to: Maximize system throughput. Achieve scheduling fairness.

5. Copyright © 2011, MBL@CS.NCTU System Overview Cross-layer optimized video delivery system: –Dynamic resource allocation WRR – Weighted Round-Robin Scheduling Algorithm –Video application Video encoding –Wireless delivery Channel quality feedback –Cross-layer optimization Best MCS – Modulation and Coding Scheme Encoder parameters

6. Copyright © 2011, MBL@CS.NCTU Cross-Layer Optimized System

7. Copyright © 2011, MBL@CS.NCTU Dynamic resource allocation - WRR WRR – Weighted Round-Robin Scheduling Algorithm: –Channel quality –Packet delay constraint –Historical average data rate To overcome: –Distortion –Throughput –Fairness

8. Copyright © 2011, MBL@CS.NCTU Dynamic resource allocation – WRR (2)

9. Copyright © 2011, MBL@CS.NCTU Dynamic resource allocation – WRR (3)

10. Copyright © 2011, MBL@CS.NCTU Dynamic resource allocation – WRR (4)

11. Copyright © 2011, MBL@CS.NCTU Dynamic resource allocation – WRR (5)

12. Copyright © 2011, MBL@CS.NCTU Experimental Analysis

13. Copyright © 2011, MBL@CS.NCTU Conclusions An extended QoS-aware OFDMA scheduling algorithm has been proposed. –System throughput –Application QoS –Scheduling fairness A cross-layer optimized system has been presented. –Achieve the best user-perceived video quality –Dynamically adapting to the instantaneous channel quality.

14. Copyright © 2011, MBL@CS.NCTU References Haiyan Luo; Song Ci; Dalei Wu; Jianjun Wu; Hui Tang, “Quality-driven cross-layer optimized video delivery over LTE,” Communications Magazine, IEEE, 2010, Page(s): 102 - 109