On providing quality-of-service control for core-based multicastrouting

摘要

In this paper, we develop efficient admission control tests formember join/leave and its associated state refresh and update proceduresfor receiver-initiated core-based multicast routing, e.g., core basedtree (CBT) protocol, to allow construction of QoS-capable multicasttrees, while making the minimum possible impact on the existinginfrastructure. Specifically, we (i) derive sufficient conditions for amulticast tree to maintain its QoS; (ii) devise effective admissiontests to verify whether or not a group member may join the multicasttree at adequate QoS, while not violating existing QoS guarantees toother on-tree members; and (iii) identify the minimum set of stateinformation required for the admission tests and develop a soft staterefresh and update procedure. Finally, we validate the effectiveness ofthe proposed mechanism by incorporating it into the CBT protocol, andevaluate it via event-driven simulations in terms of the probability ofjoin requests being rejected, message overhead, and scalability