Abstract:
Consideration is given to the problem of estimation of
the true stationary mean response time
in the discrete-time single-server queue of infinite capacity,
with Bernoulli input, round-robin scheduling,
and inaccurate information about the
service time distribution which is considered to be general arithmetic.
It is shown that the upper bound for the true value
may be provided by the mean response time in the discrete-time
single-server queue with LIFO (last in, first out) service discipline and
resampling policy. The latter implies that
a customer arriving to the nonidle system
assigns new remaining service time for the customer in the server.
For the case when the true service time distribution
is geometric and the error in the service times
is of multiplicative type, conditions are provided
which, when satisfied, guarantee that the proposed method
yields the upper bound across all possible values of the system's load.
Keywords:discrete time, inverse service order, inaccurate service time, round robin scheduling, resampling policy.