Abstract: Interconnected first and second radio access technology (RAT) systems simultaneously communicate with mobile terminals each capable of operating in both the first and second RAT systems. A given mobile terminal is capable of detecting it is within range of an access point of the second RAT while the terminal is in communication with an access point of the first RAT. It exchanges registration signals (412, 414) with the access point of the second RAT and only then does it provide an identification signal (430) indicative of registration therein to the access point of the first RAT. There it is used in determining whether to handover the terminal to the second RAT. Using this approach, there is no need for a complex measurement reporting system and, as another benefit, mobile terminals without dual-RAT capabilities are relieved of unnecessary radio measurements.

Abstract: This invention describes a new methodology for a cell reselection by a mobile station (MS) for improving network interconnection and interoperability in a limited mobile access environment. The invention is applicable to any kind of networks and their interconnections. The invention describes how the MS can better recover from failed intersystem cell reselection attempts so that there are fewer subsequent failed attempts using two major improvements. First, the MS takes into consideration during cell reselection evaluation and candidate-cell selection, whether the MS had previously been unsuccessful in reselecting the considered cell. This means treating neighbor cells to which the MS had failed reselection before with a lower priority in subsequent cell reselection evaluations. Second, the MS is allowed to stop monitoring and thus, to stop evaluating cells if it was earlier found that the access to those cells is forbidden.