ABSTRACT
This chapter is about queueing systems with strategic customers and server vacations. We start by defining the various types of vacations.
• Planned vs. forced vacations: Server vacations may be strategically planned, like for scheduled maintenance. Strategic (planned) vacations typically start when the server becomes idle. In other cases vacations are forced as a result of random events, for example breakdowns caused by mechanical failure, or when the server is reassigned higher priority customers, called primary users (PUs), whereas customers in the model are considered secondary users (SUs). These terms, primary and secondary users, are especially popular in the literature on cognitive radio networks.
