Scalable data naming for application level framing in reliable multicast

The Application Levd Raining (ALF) protocol architecture [2] encourag~ apphcation control over mech* that traditiontiy W tithin the %ansport layer”, e.g., loss detection md recovery. ~aditiond ARQ-based rtiable protocok for unicast (e.g., TCP) as w~ as mtdticast (e.g., Horus [30], ~ITP [15], etc.) number data units sequenti~y to detect 10SSS. Unfortunatdy, these hmport-levd sequence nuntbers do not permit receivers to fiatibly t~or their r~abti~ semantics. Achieving receiver-driven r&abti~ is cutnbersome in the e%mg ~ayeredn artitecture of the netiork protocol stack whine the receiving application has no knowledge of how apphcation-levd objects map onto transport levd sequence numbers. b this paper, we propose a new data naming scheme that e\Toss the structure of appEcation data to the transport layer, thereby mcing the ~\TrXbti@ of= apphcations’ r&abti@ and ordering se mantiw. IfTe apply this data naming scheme to a rtiable mtitiwt protocol framework to achieve receiver-t~ored re fiabii~ that enhancw its sdabii~. To demonstrate the ~caey of our scheme, we have designed and implemented our scalable naming and announcement protocol (SNAP) in the mtitimedia application too~t MASH [17] as a reusable protocol modtie.