Joint source / channel coding forwwan multiview video multicast with cooperative peer-to-peer repair

Zhi Liu*, Gene Cheung, Vladan Velisavljević, Erhan Ekmekcioglu, Yusheng Ji

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


WWAN video multicast is challenging because of unavoidable packet losses, and inability to perform retransmission per packet for every user due to the NAK implosion problem. Previously proposed cooperative peer-to-peer repair (CPR) strategy, leveraging on the broadcast nature of wireless transmission and "uncorrelatedness" of receivers' channels, calls for peers with good WWAN channels to streaming server (rich peers) to locally relay packets lost to peers with bad WWAN channels (poor peers) over a secondary ad-hoc WLAN network. In the interactive multiview video streaming (IMVS) scenario, however, where users can each periodically select one out of many available views for decoding and display, a poor peer may not have a neighboring rich peer watching the same view for packet recovery via CPR. In this paper, we propose a new CPR strategy for peers to repair lost packets to neighbors watching different views. The key idea is for server to transmit depth maps in addition to texture maps, so that lost frames in a different view can be reconstructed using depth-image-based rendering (DIBR). Like Forward Error Correction (FEC) packets, encoded depth maps incur an overhead in redundant information transmission to counter network losses, and we allocate optimal amount of bits for FEC packets (for same-view direct path protection via WWAN source) and depth map encoding (for different-view indirect path via CPR peers) to minimize expected distortion. Experimental results show our proposed CPR scheme offers a 3.4dB PSNR improvement over a non-CPR scheme that relies on FEC only.

Original languageEnglish
Title of host publicationPV 2010 - 2010 18th International Packet Video Workshop
Number of pages8
Publication statusPublished - 2010
Externally publishedYes
Event2010 18th International Packet Video Workshop, PV 2010 - Hong Kong, China
Duration: 2010 Dec 132010 Dec 14


Other2010 18th International Packet Video Workshop, PV 2010
CityHong Kong


  • Cooperative networks
  • Joint source/channel coding
  • Multiview video
  • Wireless multicast

ASJC Scopus subject areas

  • Computer Networks and Communications


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