Systems and methods for interworking between two different networks are presented. In one embodiment, a method for wireless communication includes requesting a network access from an access point of a first network, and transmitting an EAP authentication request from the access point to a user end. An EAP authentication request response is sent from the user end to the access point. The EAP authentication request response includes an attach type indicator that indicates to a gateway associated with the access point whether the attach request is an initial attachment or a handover from a second network.