A Congestion Control Mechanism Supporting Multimedia Communications with QoS Requirements

The current stability of the Internet depends on the end to end congestion control of TCP based on the Additive Increase Multiplicative Decrease (AIMD) algorithm.The current TCP congestion control is appropriate for applications such as bulk data transfer,but not for real time applications as multimedia communications.Most of existing congestion control works are suitable for the best effort flows,but not for the flows with QoS requirements.In this paper,the congestion control issue of different classes of data flows in the Internet between sender and receiver is investigated.By adopting equation based rate control (EBRC) for differentiated services instead of traditional TCP congestion control for best effort service,a new congestion control mechanism for multimedia communications with QoS requirements can be achieved.A dynamic partial buffer sharing scheme (DPBS) for packet loss control and a method of calculating the packet loss rate by receiver are proposed in this paper.Finally,the system architecture of the new congestion control mechanism is described.