Peer-assisted packet loss repair for IPTV video multicast

Authors:
Zhi Li;Xiaoqing Zhu;Ali C. Begen;Bernd Girod
Affiliations:
Department of Electrical Engineering, Stanford University, Stanford, CA, USA;Cisco Systems Inc., San Jose, CA, USA;Cisco Systems Inc., San Jose, CA, USA;Department of Electrical Engineering, Stanford University, Stanford, CA, USA
Venue:
MM '09 Proceedings of the 17th ACM international conference on Multimedia
Year:
2009

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Abstract

Emerging IPTV technology uses source-specific IP multicast to deliver TV programs to the end-users. To provide timely and reliable services over the error-prone DSL access networks, a combination of multicast forward error correction and unicast retransmissions is employed to mitigate the impact of impulse noise. In current systems, the retransmission function is provided by the Retransmission Servers. We propose an alternative distributed solution where the burden of loss repair is partially shifted to the peer IP set-top boxes. Through the Peer-assisted Repair (PAR) protocol, we demonstrate how the packet repairs can be delivered in a timely, reliable and decentralized manner using the combination of server-peer coordination and coded redundant repairs. We show through analysis and simulations that this new solution not only effectively mitigates the bottleneck experienced by the Retransmission Servers, thus greatly improving the scalability of the system, but also efficiently deals with peer departures and other uncertainties.