IJSRP, Volume 3, Issue 3, March 2013 Edition [ISSN 2250-3153]
Dr.(Mrs).K.Udaya Chandrika, Mrs.C.Kalaiselvi
Batch arrival feedback queue with additional multi optional service and multiple vacation is considered. All the arriving customers demand first essential service and only some of them demand second optional service. After the completion of second service, customer may feedback to the tail of original queue to repeat the service until it is successful or may depart forever from the system. If there is no customer in the queue the server goes on multiple vacation. Service times are gernerally distributed and vacation time is exponentially distributed. The time dependent probability generating functions has been obtained in terms of their Laplace transforms and the corresponding steady state results are obtained explicitly. Mean queue length and mean waiting time are computed.