Published online by Cambridge University Press: 14 July 2016
Kingman (1962) studied the effect of queue discipline on the mean and variance of the waiting time. He made no assumptions regarding the stochastic nature of the input and the service distributions, except that the input and service processes are independent of each other. When the following two conditions hold:
(a) no server sits idle while there are customers waiting to be served;
(b) the busy period is finite with probability one (i.e., the queue empties infinitely often with probability one);