Reducing location registration signalling in inter network (inter RAT) handover.

摘要

A method is disclosed for reducing signalling between a mobile terminal and a cellular communications network having at least a first bearer technology and a second bearer technology. The method comprise: performing an initial location registration event between the mobile terminal and the cellular communications network; storing session management state data when the terminal enters a state in which the terminal is simultaneously registered with the network over the first and second bearer technologies; when the active bearer technology is changed from the first bearer technology to the second bearer technology, determining the current session management state data and comparing the stored session management state data to the current session management state data; and if the stored session management state data and current session management state data are different, triggering a further location registration event.