METHODS AND APPARATUSES FOR OPERATING A USER EQUIPMENT WITH A BASE STATION OF CELLULAR NETWORK

The present invention relates to a method for operating a user equipment with a base station assigned to at least two core networks in co-existence mode of a cellular network, the user equipment operating in a data communication mode with direct connection termination in the at least one core network,the method comprising the steps for the user equipment of:- camping on a base station with access to at least two core networks of different technology standards,- receiving a transmission from said base station indicating available radio resources of the first and of the second core network,- selecting the core network which is appropriate for said envisaged connection,- sending a connection request for envisaged connection to the base station using parts of said indicated radio resources belonging to the selected core network,- receiving a response indication from the base station.