The invention relates to a method and network control node for detecting the point of attachment of mobile terminals moving within a mobile communication network in idle mode, wherein the mobile communication system can be logically divided into plural tracking areas to which the mobile terminals register. Further, the invention relates to a method for enabling management of mobile terminals in idle mode receiving a service within such mobile communication system. Moreover, the invention relates to a method and mobile terminal for updating the mobile terminal's tracking area registration in a mobile communication system being logically divided into plural tracking areas, wherein mobile terminal is in idle mode and is registered to plural tracking areas simultaneously. The invention suggests different mechanism how to detect terminals registering to plural tracking area, how to verify their current location in the network and how to use these information, for example for resource management.