Dynamics of the "pgmcc " Multicast Congestion Control Protocol

Ab.rlracr-Faimcss 10 current Internet lrunk, particularly Tep, l ~ DOC of the imporllml requirements for deploying multicast protocols. In Ihis pa. per, we investigate the rairness of the mulliClSI congestion control protocol "pgmcc, " implemented on top urlhe PGM multicast protocol. Pgmcc is one of the most promising mullicasl congestion control proposals, but it has nol yd been c:dcIISively slress-tested. in the lileralure. Two sets of experiments lire conducted in lhis paper. In firsl set of experiments, we e"amine the ef-feel offccdbackn~tiDnOIl pgmcc. In the semnd set of experiments, we investigale the performance ofpgmee when eompeling wilh burslyTCP and UDP Bows in scenario wilh multiple lime-varying bOlllenecks::Ind round Irip times. Our results indicate thai pgmcc is robust, bUI may need some modificalions such us an algorithm for dynamically detcmtining the lime-oul algorilhm and hnndling switches among receiver rcpresenlati\'CS beller. KeyworoS-iDulticnst, eongeslion conlrol. pgmcc, fairness. feedback ag-grq:nlio