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Strong demands for public wireless broadband services will require more capacity than even that can be supplied by advanced mobile cellular systems. For this reason, there is currently a strong need for interworking mechanisms between WLANs and cellular data networks. But one of the problems which the operators of this new architecture face is its process of management. Policy-based networking (PBN) is a novel technology that facilitates the management and operation of networks. In this article policy-based network management reference architecture for integrated environment WLAN-3G is proposed.