RT Conference Proceedings T1 A Discrete-time Queueing System With Imperfect Information for the Server A1 Atencia-McKillop, Iván A1 Galán-García, José Luis A1 Aguilera-Venegas, Gabriel A1 Rodríguez-Cielos, Pedro A1 Padilla-Domínguez, Yolanda Carmen A1 Galán-García, María Ángeles K1 Colas de espera, Teoría de AB We consider a discrete-time Geo=G=1=1 system in which a customer that finishes its fi rst essential service may opt to abandon the system, to receive a second optional service or to place at the head of the queue in order to receive another essential service. We study the Markov chain underlying the considered queueing system and its ergodicity condition. Using a generating function approach the distribution of the number of customers in the queue and in the system as well as their respective means are given.The busy period of an auxiliary system, that will be useful to study the customers delay is analysed. The distributions of the sojourn time of a customer in the server, the queue and the system are provided. In order to illustrate the e ect of the parameters on several performancecharacteristics some numerical examples are given. Finally, a section of conclusions describing the main research contributions of the paper are presented. YR 2020 FD 2020-07-24 LK https://hdl.handle.net/10630/19677 UL https://hdl.handle.net/10630/19677 LA eng NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 21 ene 2026