In off-line streaming, packet level erasure resilient Forward Error
Correction (FEC) codes rely on the unrestricted buffering time at the receiver.
In real-time streaming, the extremely short playback buffering time makes FEC
inefficient for protecting a single path communication against long link
failures. It has been shown that one alternative path added to a single path
route makes packet level FEC applicable even when the buffering time is
limited. Further path diversity, however, increases the number of underlying
links increasing the total link failure rate, requiring from the sender
possibly more FEC packets. We introduce a scalar coefficient for rating a
multi-path routing topology of any complexity. It is called Redundancy Overall
Requirement (ROR) and is proportional to the total number of adaptive FEC
packets required for protection of the communication. With the capillary
routing algorithm, introduced in this paper we build thousands of multi-path
routing patterns. By computing their ROR coefficients, we show that contrary to
the expectations the overall requirement in FEC codes is reduced when the
further diversity of dual-path routing is achieved by the capillary routing
algorithm.Comment: Emin Gabrielyan, "Reliable Multi-Path Routing Schemes for Voice over
Packet Networks", ICDT'06, International Conference on Digital
Telecommunications, Cote d'Azur, France, 29-31 August 2006, pp. 65-7
