The IEEE 802.16 standard, called WiMAX (Worldwide Interoperability for Microwave ACCess), defines the basics of the mechanisms enabling the QoS (Quality of Service) provisioning in multiservice BWA-based networks. However, the standard does not define the specifics of such mechanisms. In recent years, several studies have undertaken the analysis of some mechanisms. Most of them, they only focus on a given element of the overall QoS framework. In this paper, after reviewing some of the most relevant studies in this area, we introduce an overall QoS framework, fully compatible with the IEEE 802.16 standard. We describe and motivate each and every element of the proposed framework.