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In this paper, we propose an intelligent quality of service (QoS) model named GQOS, with service differentiation based on neural networks in mobile ad hoc networks. The model is composed of two plans: the GQOS kernel plan and the intelligent learning plan. New mechanisms have been developed and integrated in the kernel plan in order to ensure the detection and recovery of QoS violations. The intelligent learning plan performs the training of GQOS kernel operations by using a multilayered feedforward neural network. Simulation results show that our model outperforms the SWAN model by about 10% in terms of average delay and throughput at lower and medium mobility.