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1 results

  • Embedded renewal processes in the GI/G/s queue

  • Ward Whitt
  • Journal:
    Journal of Applied Probability / Volume 9 / Issue 3 / June 1972
    Published online by Cambridge University Press:
    14 July 2016, pp. 650-658
    Print publication:
    June 1972

  • The stable GI/G/s queue (ρ < 1) is sometimes studied using the “fact” that epochs just prior to an arrival when all servers are idle constitute an embedded persistent renewal process. This is true for the GI/G/1 queue, but a simple GI/G/2 example is given here with all interarrival time and service time moments finite and ρ < 1 in which, not only does the system fail to be empty ever with some positive probability, but it is never empty. Sufficient conditions are then given to rule out such examples. Implications of embedded persistent renewal processes in the GI/G/1 and GI/G/s queues are discussed. For example, functional limit theorems for time-average or cumulative processes associated with a large class of GI/G/s queues in light traffic are implied.