Multiple Time Scale Redundancy Control for QoS-Sensitive Transport of Real-time Traffic - INFOCOM 2000. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies

Absrracr-End-taend QOS control over best-effort and differentiated service networks which exhibit variability in their exported service properties looms as an important challenge. In previous work, we have shown how packet-level adaptive FEC can be used in dynamic networks to fadlitate invariant user-specified QoS in an end-to-end manner. This paper addresses two important problems-seit-similar bumtiness and performance degradation of reactive controls subject to long feedback loops--complementlng the stabilityloptimality considerations studied earlier. First, for adaptive redundancy control to be effeetfve, its susceptibility to correlated packet drops and queueing delsys stemming lrom selfsimilar burstiness must be fortifled. Second, to preserve FEC’s viability over ARQ when transporting real-time trafftc in WANs, proactivity must be injected to offset the performance degradation of reactive feedback controls when subject to long RTTs. In this paper, we use the recently advanced multiple time scale c o n e tion control framework-first investigated in the throughput maximization c o n t e x t 4 endow adaptive redundancy control With both selective protection agaiast self-similar burstiness as well as proactivity to f e d back redundancy control. We analyze, implement, and benchmark our protocol-AFEC-MT-in the context of transporting periodic real-time traflic, in particular, MPEG video.