Queueing Systems

, Volume 19, Issue 4, pp 345–359 | Cite as

Quasi-reversible multiclass queues with order independent departure rates

  • S. A. Berezner
  • C. F. Kriel
  • A. E. Krzesinski


This paper introduces a new class of queues which are quasi-reversible and therefore preserve product form distribution when connected in multinode networks. The essential feature leading to the quasi-reversibility of these queues is the fact that the total departure rate in any queue state is independent of the order of the customers in the queue. We call such queues order independent (OI) queues. The OI class includes a significant part of Kelly's class of symmetric queues, although it does not cover the whole class. A distinguishing feature of the OI class is that, among others, it includes the MSCCC and MSHCC queues but not the LCFS queue. This demonstrates a certain generality of the class of OI queues and shows that the quasi-reversibility of the OI queues derives from causes other than symmetry principles. Finally, we examine OI queues where arrivals to the queue are lost when the number of customers in the queue equals an upper bound. We obtain the stationary distribution for the OI loss queue by normalizing the stationary probabilities of the corresponding OI queue without losses. A teletraffic application for the OI loss queue is presented.


Product from networks quasi-reversibility order independent departure rates loss networks MSCCC queues 


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Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • S. A. Berezner
    • 1
  • C. F. Kriel
    • 2
  • A. E. Krzesinski
    • 2
  1. 1.Dept of Mathematical StatisticsUniversity of NatalDurbanSouth Africa
  2. 2.Dept of Computer ScienceUniversity of StellenboschStellenboschSouth Africa

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