Dr. Ali C. Begen Profile

Dr. Ali C. Begen

at Cisco Systems

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Proceedings Article | 5 August 2010 Paper

IPTV multicast with peer-assisted lossy error control

Zhi Li, Xiaoqing Zhu, Ali Begen, Bernd Girod

Proceedings Volume 7744, 77440T (2010) https://doi.org/10.1117/12.863273

KEYWORDS: Video, Forward error correction, Silicon, Failure analysis, Synthetic aperture radar, Remote sensing, Error control coding, Chlorine, Televisions, Receivers

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Emerging IPTV technology uses source-specific IP multicast to deliver television programs to end-users. To provide reliable IPTV services over the error-prone DSL access networks, a combination of multicast forward error correction (FEC) and unicast retransmissions is employed to mitigate the impulse noises in DSL links. In existing systems, the retransmission function is provided by the Retransmission Servers sitting at the edge of the core network. In this work, we propose an alternative distributed solution where the burden of packet loss repair is partially shifted to the peer IP set-top boxes. Through 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 redundancy of repairs. We also show that this distributed protocol can be seamlessly integrated with an application-layer source-aware error protection mechanism called forward and retransmitted Systematic Lossy Error Protection (SLEP/SLEPr). Simulations show that this joint PARSLEP/ SLEPr framework not only effectively mitigates the bottleneck experienced by the Retransmission Servers, thus greatly enhancing the scalability of the system, but also efficiently improves the resistance to the impulse noise.

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