Abstract: A method for operating a communication network includes: receiving, by a business support system of a resource reservation system, a reservation request, the reservation request indicating a Quality of Service (QoS) for an upcoming connection to be provided at a time distance from a reservation by the communication network for a terminal device and an application or service accessed by the terminal device via the upcoming connection; checking, by a bookkeeper decision engine of the resource reservation system, whether the business support system has availability for the indicated QoS; in response to confirming the availability for the indicated QoS, sending, by the bookkeeper decision engine, a reservation confirmation; and providing, by the communication network, the upcoming connection with the indicated QoS assigned for the terminal device at the time distance from the reservation.