IP technology will play a key role in next generation wireless networks, which face the great challenge of integration in order to provide seamless service to users anywhere and anytime. On the basis of the architecture for Qos in next generation wireless network, a coordinated call admission control mechanism was presented, providing an end-to-end RSVP context transfer for real-time applications to overcome the weakness of the context transfer protocol which cannot meet the need of end-to-end QoS mechanisms because the contexts were only transferred between the previous and new access routers. This mechanism decreased the delay caused by re-initiate QoS signaling from scratch to reestablish QoS forwarding process, and minimized the handover service disruption.