Protecting IPTV against packet loss: Techniques and trade-offs

Abstract

telecommunication companies to offer data services including web browsing or email to their customers, are now being upgraded to also offer video services (referred to as Internet Protocol TV [IPTV] over DSL) to these customers. Because of their easy access to a return channel and because individual customers are easily addressed, these DSL networks have an advantage over traditional networks to offer the new emerging video services. However, since they were designed to support data services, they may need special measures to offer the linear programming TV service at the same quality of (evolutions of) traditional networks.

Supporting next-generation multimedia services over a broadband access network

“…During transport of the bits, errors may occur due to the cross-talk between the twisted pairs in the same binder or due to impulsive noise. There are various ways to keep the bit errors and associated packet loss under a desired bound [5]. Typically, they introduce an overhead bit rate of a few percentage points and a delay of 10 to 20 ms.…”

“…In order to correct bit errors or to recuperate lost packets, additional bit rate is needed. Either a retransmission or forward error correction (FEC) scheme can be used [5]. The overhead required to protect the packet flow depends very much on the statistics of the bit error and packet loss process.…”

Maintaining video quality and optimizing video delivery over the bandwidth constrained DSL last mile through intelligent packet drop

“…DSL access networks and some home network technologies (especially wireless) are known to be error-prone despite physical layer error protection technologies in place. The additional protection above layer 3 (L3ϩ) can be done either through FEC or by means of retransmissions [1].…”

Packet Loss Characteristics of IPTV-Like Traffic on Residential Links

“…The effect of DSL packet loss on IPTV traffic has been discussed in some detail [11], [12]; these papers also discuss error recovery strategies using FEC and retransmission. It is noted that FEC techniques (e.g.…”