Resumen Consideremos el sistema de colas con reintentos M2/G2/1 con dos tipos de clientes y política de reintentos lineal. Si un cliente llega al sistema y encuentra el servidor libre, entonces empieza su servicio inmediatamente. Si no, los clientes del primer tipo van a una cola y apenas se libera el servidor, el primer cliente empieza su servicio. El segundo tipo de clientes al encontrar el s...

This paper considers a tandem queueing network with Poisson arrival process of incoming calls, two servers, and infinite orbits by the method asymptotic analysis. The servers provide services for calls exponentially distributed random times. Blocked customers at each server join orbit that retry to enter again after an time. Under condition low retrial rates, we prove joint stationary distribut...

In this paper, a finite-source retrial queueing system with twoway communication is investigated the help of simulation program own. If randomly arriving request from finds single server idle its service starts immediately, otherwise it joins an orbit where generates retrial/repeated calls after random time. To increase utilization when becomes time outgoing called for infinity source. Upon arr...

In this paper, we investigate a single server batch arrival non-Markovian retrial queueing model with random break down and Bernoulli vacation. Customers arrive in batches accordingly Poisson process with arrival rate λ but are served one by one with first come first served basis. All customers demand the first essential service, whereas only some of them demand the second optional service. The...