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This work focuses on the problem of dynamically determining the optimal buffer threshold for message transferring services (SMS, MMS) in GPRS-UMTS networks. An infinitesimal perturbation analysis (IPA), based on stochastic fluid models (SFM) is used to obtain sensitivity estimates of the performance measure of interest with respect to the control parameter and the near-optimal buffer threshold is obtained by using stochastic approximation techniques. As a result, these approaches are used continuously to adjust the buffer size when the traffic condition changes.
Date of Conference: 19-23 April 2004