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Given the convergence towards an all IP platform, there has been a tremendous growth in demand for new multimedia applications, which have critical delay and jitter parameters. Thus, the proposed services by all-IP generation require a serious study of QoS parameters by establishing a new algorithm of traffic management. The topic of this paper is the evaluation of QoS parameters in real Pre-Wimax environments. The main contribution is the validation of an analytical delay-jitter behavior model. These models can be used in optimization algorithms in order to provide opportunistic and reliable all-IP networks. It allows understanding the impact of the jitter constraints on the throughput and packet loss in wireless systems. However, we show that the real-time QoS requirements of real-time and interactive services can be avoided to a large degree by controlling the packet delay-jitter in a fixed and mobile environment. The QoS metrics have been computed from live measurements in a Pre-Wimax realistic environment (Toulouse/Blagnac Airport). Tested technology was Pre-Wimax with ALAVRION equipments operating in unlicensed frequency bands (5.4GHz in France) in Time Division Duplex (TDD) mode.