Various multimedia streaming have started to be offered in Internet protocol (IP) networks. However, since current networks cannot operate well if the consumers' end system sends multimedia stream at will, an admission control is becoming an important part of IP networks. Therefore, we previously proposed an admission control scheme we call "tentative accommodating and congestion confirming strategy (TACCS)". The basic idea is to accommodate incoming flows tentatively and then confirm congestion after a certain period. In TACCS, the ingress nodes of a domain make flow-accommodating decisions based on information about packet-loss events. The information is assumed to be advertised from congestion detection agents (CDAs) located in the domain. If comparable performance could be achieved without adding CDA functions to core nodes, the cost of deploying TACCS would be reduced and its scalability would be improved. We have thus developed an enhanced TACCS called "edge-based TACCS" that achieves admission control based on cooperation of high functional edge nodes and does not depend on CDAs in the core network. Simulation showed that the performance of edge-based TACCS is comparable to that of conventional TACCS that depends on CDAs in the core network.
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