1 / 16

APPLICATION-LAYER ERROR RESILIENCE FOR WIRELESS IP-BASED Video Broadcasting

SHEAU-RU TONG Management Information System Dept., National Pingtung University of Science and Technology, Taiwan (R.O.C.) srtong@mail.npust.edu.tw YUAN-TSE YU Dept. of Software Engineering National Kaohsiung Normal University, Taiwan ( R.O.C.) yuyt@nknucc.nknu.edu.tw .

urvi
Download Presentation

APPLICATION-LAYER ERROR RESILIENCE FOR WIRELESS IP-BASED Video Broadcasting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SHEAU-RU TONG Management Information System Dept., National Pingtung University of Science and Technology, Taiwan (R.O.C.) srtong@mail.npust.edu.tw YUAN-TSE YU Dept. of Software Engineering National Kaohsiung Normal University, Taiwan (R.O.C.) yuyt@nknucc.nknu.edu.tw APPLICATION-LAYER ERROR RESILIENCE FOR WIRELESS IP-BASED Video Broadcasting

  2. Background Replicate Multiple Descriptor (RMD) Coding Simulation and Performance Evaluation Conclusions Outline

  3. Multi-path fading and fast interference in wireless networks causes heavy packet loss burst and poor video broadcast quality. Low-layer forward error coding (FEC) is suitable for fixing short-term loss burst, but not for long-term loss burst. Background

  4. A HSDPA traffic trace (with link-layer FEC) of a moving vehicle where multiple-packet-loss events frequently occur. Background

  5. Multiple descriptor coding (MDC): • Split a video stream into several sub-streams (descriptors) • Encode each sub-stream independently and transmit them over different data paths. • Exploiting path diversity. • Protecting key-frame is more efficient! Background Application-layer error resilience is desirable!

  6. Basic idea: logically applying MDC in the application layer with two new features. • Replicate key-frames • Interleave multiple descriptors over an IP multicast channel. • Advantages: • Distributing long loss burst over multiple descriptors to mitigate the damage impact. • Exploiting time diversity of key frame transmission. Replicate Multiple Descriptor (RMD)

  7. The system architecture of RMD Replicate Multiple Descriptor (RMD)

  8. Frame replication/insertion • b: the number of replicas. • s: the number of the frame slots shifted. Replicate Multiple Descriptor (RMD)

  9. Analysis of RMD • Frame slot time (Isub-stream) where k is number of sub-streams, r video data rate and p GOP size. • Delay (D) and buffer space (B) where SI and SO are the maximum frame size of I frames and the other frames, respectively. Replicate Multiple Descriptor (RMD)

  10. Key frame error probability (Pkf_err) where e is the packet slot error rate, g is the number of packets for an I frame. Replicate Multiple Descriptor (RMD) P­kf_err with respect to various b’s when k=4 and g=4.

  11. Simulation configurations • 400 frames MPEG-4 with a QCIF format. • 30 fps with GOP pattern of IPPPPPP. • Packet size of 1024 bytes • Comparing RMD with • Single Descriptor (SD) • Multiple Descriptors (MD) • SD/FEC(255, 159) • MD/FEC(255, 159) Simulation and Performance Evaluation

  12. Simulation and Performance Evaluation • When the packet loss rate increases beyond 15%, RMD starts to outperform SD/FEC or MD/FEC (PSNR>21dB).

  13. Simulation and Performance Evaluation • The instances of PSNR with respect to various schemes when packet loss rate e = 20%. RMD protects the key frame better!

  14. Simulation and Performance Evaluation • Impact of b and s in RMD • The PSNR curve is improved (leveraged) as s and b increases. • The improvement is magnified under a heavy packet loss condition (15%-35%) Average PSNR of RMD with respect to various s’es when b=2. Average PSNR of RMD with respect to various s’es when b=3.

  15. Redundancy cost (ε =20%) • RMD (b=3) has a redundancy ratio slightly higher than that of MD/FEC, but can gain a PSNR about 5 dB. Simulation and Performance Evaluation

  16. RMD is an ideal application layer approach for combating excessive burst errorsand protecting key frames. RMD (b=3) has a redundancy ratio slightly higher than that of MD/FEC, but can gain a PSNR about 5 dB subject to ε =20%. How to co-work RMD with other adaptive FEC to offer a full spectrum of protection against various burst errors is worthy of further study. Conclusions

More Related