Transmission of Semi-elastic Flows under High Variability Background Traffic

M. Postigo-Boix, J. Garcia-Haro, and J.L. Melus-Moreno (Spain)


Internet Cost minimization, Quality of Service, client server, semi-elastic flows, delivery of streaming media content.


New Internet applications and services are associated to the provision of quality of service (QoS) guarantees and differentiation demands. Consequently, many emerging Internet protocols and mechanisms have appeared to en sure end-to-end QoS. Obviously, network operators and service providers will charge the use of network resource reservation in a more expensive way than the classical best-effort (BE) service to encourage a rational utilization of resources. For this reason, it is essential to minimize resource reservation when possible. In this paper, we briefly review an initial and simple method proposed by us to minimize the cost when Internet traffic flows are classified as semi-elastic. Our method is based on a client server scheme in which the client controls its memory occupancy to determine when it is necessary to reserve resources or to use a BE mode for the transmission main taining the same connection. Then, we present an en hanced method to achieve high accuracy in the minimiza tion when the best-effort delivery rate presents high vari ability. The results for a system implementation in the ns 2 network simulator are presented, showing the good performance of this new method.

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