METHOD AND USER EQUIPMENT FOR SELECTING A CORE NETWORK

The present invention relates to a method for a user equipment operating on a first base node of a cellular network, the first base node communicatively coupled to two core networks of said cellular network, the user equipment operating in an open data exchange session by means of a data exchange context terminating in selected one of the two core networks, the user equipment further maintaining a first device identity received from said selected core network,the method comprising the step for the user equipment of:- identifying at least one second base node of said cellular network,- checking if said at least one second base node has access to the selected core network,- if not, sending a connection reestablishment message to the second base node, having access to a core network different from the selected core network, hereinafter the second core network,- receiving through the second base node a second device identity of the second core network,- sending an acknowledge message to the second base node,- resuming said data exchange session with said second base node over the second core network using said second device identity.