IPTV multicast with peerassisted lossy error control Emerging IPTV technology uses sourcespecific IP multicast to deliver television programs to endusers. To provide reliable IPTV services over the errorprone 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 settop boxes. Through PeerAssisted Repair (PAR) protocol, we demonstrate how the packet repairs can be delivered in a timely, reliable and decentralized manner using the combination of serverpeer coordination and redundancy of repairs. We also show that this distributed protocol can be seamlessly integrated with an applicationlayer sourceaware error protection mechanism called forward and retransmitted Systematic Lossy Error Protection (SLEPSLEPr). Simulations show that this joint PARSLEPSLEPr 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.

Improving P2P LiveContent Delivery using SVC P2P content delivery techniques for video transmission have become of high interest in the last years. With the involvement of client into the delivery process, P2P approaches can significantly reduce the load and cost on servers, especially for popular services. However, previous studies have already pointed out the unreliability of P2Pbased live streaming approaches due to peer chum, where peers may ungracefully leave the P2P infrastructure, typically an overlay networks. Peers ungracefully leaving the system cause connection losses in the overlay, which require repair operations. During such repair operations, which typically take a few roundtrip times, no data is received from the lost connection. While taking low delay for fastchannel tunein into account as a key feature for broadcastlike streaming applications, the P2P live streaming approach can only rely on a certain media prebuffer during such repair operations. In this paper, multitree based Application Layer Multicast as a P2P overlay technique for live streaming is considered. The use of Flow Forwarding (FF), a.k.a. Retransmission, or Forward Error Correction (FEC) in combination with Scalable video Coding (SVC) for concealment during overlay repair operations is shown. Furthermore the benefits of using SVC over the use of AVC single layer transmission are presented.