In Internet, the user's traffic crosses several domains. More and more the users want end-to-end quality of service (QoS). So it’s necessary to have differentiation mechanisms in the access networks where the bottlenecks are often located. In this paper, we propose a global quality of service management applied to DiffServ environments and IEEE 802.11e wireless networks. We analyze the essential basis for DiffServ in order to ensure an optimal differentiation. Then we evaluate