Activating and Deactivating Repair Servers in Active Multicast Trees
IWDC '01 Proceedings of the Thyrrhenian International Workshop on Digital Communications: Evolutionary Trends of the Internet
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Server based local recovery approaches are efficient in providing Reliable Multicast in a best effort network. In this paper we investigate how Repair Servers should be placed in the multicast tree spanning source and receivers in order to minimize costs and reduce packet delivery latency. We consider a cost function that accounts for the cost of transmission and buffering and processing at the RS. The cost-optimal placement of buffering resources depends on parameters such as link loss pattern and relative buffer cost. We also consider the case when link loss behavior changes over time. An adaptive, distributed, and autonomous policy is proposed based on on-line estimation of packet loss, which makes decisions for activation and deactivation of Repair Servers. The policy shows good performance in a simple case study.