UMTS is expected to allow the users to collaborate and participate to a common live activity through their mobile multimedia terminal equipment. Users and operators are looking forward the development of new interactive and collaborative applications such as interactive games on mobile phones. We develop an approach and a model to tackle technological locks and offer the opportunity to operators to provide their users with applications where they participate to a common live activity. This paper presents our Collaborative Model for Wireless Adaptive and Reconfigurable Environments (COMWARE) and its implementation architecture which aims to provide UMTS users a QoS support for collaborative applications. This model aims to reconcile openness and QoS requirements for collaborative relationships using wireless multimedia systems. For interactive collaborative applications, logical requirements should ensure synchronization between the displayed scenes of the same scenario on a set of UMTS equipment and the management of precedency to deal with interaction applications such for interactive games. COMWARE integrates QoS provision and management.