With the fast deployment of wireless hand-held terminals, multimedia applications are getting more and more significant for mobile networks. As a result, the QoS (quality of service) support for multimedia in mobile networks has become more and more important. Resource reservation is the current scheme supporting QoS for the Internet. However, reservation of resources and maintenance of QoS for the mobile host as it moves from one area to another create a new set of challenges. It needs other mechanisms to help maintain QoS. In this paper, we propose to use a combination of MRSVP and CAC (connection admission control) to enforce QoS guarantees in mobile networks. Our CAC algorithm not only considers the connection number in the current cell, but also takes the reservation flows of adjacent cells into account. And the simulation results show that our algorithm does provide good performance for mobile networks.