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QoS Equalization in a Multirate Loss Model of Elastic and Adaptive Traffic with Retrials

Authors:
Ioannis Moscholios
Vassilios Vassilakis
Michael Logothetis
Michael Koukias

Keywords: Poisson process, elastic/adaptive traffic, call blocking, reservation, recurrent formula

Abstract:
In this paper, we consider a single-link modeled as a loss system, which accommodates multirate traffic of elastic and adaptive calls. Calls arrive in the link according to a Poisson process, have a peak-bandwidth requirement while their service time is exponentially distributed. If the available link bandwidth is lower than the peak-bandwidth requirement of a new call, then the call can retry to be connected in the link with reduced bandwidth, one or more times (single/multi-retry loss model). If the available link bandwidth is still lower than the last bandwidth requirement of the call, then the call can be accepted in the link by compressing the bandwidth of all in-service calls (of all service-classes) together with its last bandwidth requirement. In this multirate loss system, we study the effect of the bandwidth reservation (BR) policy on Call Blocking Probabilities (CBP) and link utilization. The BR policy achieves CBP equalization among calls of different service-classes, or guarantees a certain quality of service for each service-class. The proposed single/multi-retry loss models under the BR policy do not have a product form solution, and therefore we propose approximate recursive formulas for the efficient calculation of CBP and link utilization. Simulation results validate the results obtained by the analytical models.

Pages: 49 to 54

Copyright: Copyright (c) IARIA, 2013

Publication date: September 29, 2013

Published in: conference

ISSN: 2326-9383

ISBN: 978-1-61208-292-9

Location: Porto, Portugal

Dates: from September 29, 2013 to October 3, 2013