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The Quality of Experience (QoE) management procedures for multimedia services benefit from an effective collaboration between the Mobile Network Operators (MNOs) and the Over-The-Top (OTT) service providers as the former can allocate the appropriate network resources to the users and the latter has access to key influence factors for having a proper view of the provided QoE. One successful collaboration model is the zero-rated data rate approach, according to which the MNO limits the data rate of the users towards the collaborating OTT applications with the benefit for the user that the generated traffic is not counted in her monthly contract data limit. Accordingly, the MNO may reduce the network congestion, and the users are encouraged to select the collaborating OTT applications. Though, this approach does not consider the resulting QoE, which may vary significantly from one user to another even if the …