Simulation of a Reliable Client-Server System for Semi-Elastic Flows

M. Postigo-Boix, J. Garcia-Haro, and M. Aguilar-Igartua (Spain)


Internet Cost minimization, QoS, semi-elastic flows.


New Internet applications and services are associated to high levels of quality of service (QoS) guarantees and differentiation demands. Consequently, many emerging Internet protocols and mechanisms have appeared to ensure 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 ra tional utilization of resources. For this reason, it is es sential to minimize resource reservation when possible. In this paper, we briefly review a proposed simple method 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 transmis sion maintaining the same connection. Then, we present a system implementation in the ns-2 network simulator and the results for two simulation experiments that sup port our research.

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