| Two
congestion-control schemes for use on the carrier-scale with VoIP services
are investigated. In operations of VoIP networks, it is important to maximize
the number of quality satisfied completed calls, not the number of admitted
calls. The schemes are distributed, simple, convenient, and do not require
the establishment of a huge control system in the network. Call-admission
control is executed either directly or indirectly by using test/reply
packets to determine the state of the network and/or the receiving-side
VoIP gateway. Characteristic values such as numbers of "quality-requirements-satisfied
completed calls" and fairness are evaluated by simulation to demonstrate
the validity of the proposed schemes. We are proceeding with this research
by using the Network Simulation Tool "OPNET Modeler". |
