Power saving control for the mobile DVB-H receivers based on H.264/SVC standard Eugeny Belyaev, Vitaly Grinko, Ann Ukhanova Saint-Petersburg State University of Aerospace Instrumentation

2 Agenda Description of the power saving in DVB-H standard Scalable extension of the H.264/AVC standard (SVC) Proposed scheme of power consumption control Simulation results and conclusions

3 Minimizing of power consumption in DVB-H receiver 1 1 ETSI TR V1.1.1 ( ): Digital Video Broadcasting (DVB); DVB-H Implementation Guidelines, European Telecommunication Standards Institute The main idea - receiver works for a short time interval, during it the part of the video data is received, then the receiver powers off completely Power saving is a function of constant and burst bitrates, burst size, synchronization time and delta-t jitter

4 For DVB-H single layer coding system all the parameters in the formula are defined values and the level of power saving can not be influenced on receiver Case 1: User can not choose the level of power consumption by himself Case 2: With scalable codec we can change parameter C b on the receiver side and change level of power consumption DVB-H power saving based on single layer video compression

5 Scalable video coding extension H.264/AVC 2 standard 2 Advanced video coding for generic audiovisual services. ITU-T Recommendation H.264 and ISO/IEC (AVC), Various ways of forming scalable video stream: Temporal scalability Spatial scalability SNR scalability Combined scalability Scalable stream means that receiver can playback video data by receiving only the part of the video stream

6 Temporal scalability The concept of hierarchically encoded B-frames Each temporal layer is marked by an additional identifier T. T is equal to 0 for frame of the temporal base layer and is increased by 1 from one temporal layer to the next. Each layer has its own frame rate.

7 Spatial scalability 3 3 H. Schwarz, D. Marpe, and T. Wiegand, “Overview of the Scalable Video Coding Extension of the H.264 / AVC Standard“, IEEE Trans. on Circuits and Systems for Video Technology, vol. 17, 2007 The dependency identifier D for the base layer is equal to 0, and it is increased by 1 from one spatial layer to the next. Each layer has its own frame resolution.

8 SNR scalability 4 4 H. Schwarz, M.Wien, “The Scalable Video Coding Extension of the H.264/AVC Standard“ IEEE Signal Processing Magazine, vol. 25, Is. 2, pp , Q=0 Q=1Q=2 Test sequence: foreman The quality identifier Q for the base layer is equal to 0, and it is increased by 1 from one quality layer to the next. Each layer has its own SNR.

9 Combined scalability 5 5 P. Amon, T. Rathgen, and D. Singer, “File Format for Scalable Video Coding“, IEEE Transactions on Circuits and Systems for Video Technology, vol. 17, No. 9, pp , Note: to extract the stream with the required parameters all other layers with less values of the identifiers should have been already extracted

10 Proposed scheme of power consumption control Receiver is choosing the necessary (D,T,Q) identifiers. These parameters define the necessary video bit rate C b. Depending on the priorities it is possible to choose receiving modes with high level of power saving (modes a and b) or receiving modes with high level of visual quality (modes c and d).

11 Simulation results 6 6 Joint Scalable Video Model 9.15 software package, CVS server for the JSVM software. Power saving and quality trade-off

12 Conclusion Scalable coding open new opportunities for the system like DVB-H User can choose trade-off between power consumption and the visual quality of the received video: frame rate SNR frame resolution

13 Questions? Thank you!