System State Distributions in One Finite Source Unreliable Retrial Queue

The object of this paper is to study joint and marginal distributions of the system states at any arbitrary time moment for a single server, finite source retrial queue, in which the server can sustain breakdowns during service times. The server life times as well as the intervals between repetitions are exponentially distributed, while the repair and the service times are generally distributed. Unlike the unreliable model studied by J. Wang et al. [23], in which the interrupted customer waits for the server back from repair, to accomplish the remaining service, in our model this customer goes to the orbit, losing the service time, elapsed before the breakdown occurs.