CIRCUIT SWITCHED FALLBACK FOR MOBILE TERMINATED CALLS

摘要

In order to prevent a mobile terminated (MT) call to a user equipment (UE) from being lost by addressing a Location Area/Tracking Area (LA/TA) mismatch problem that could occur during a circuit switched (CS) Fallback, the method comprises the steps of : receiving a paging message from a mobility management entity, MME, where the paging message identifies suitable location areas, the paging message is sent because a first mobile switching center, MSCl, received a MT call request for the UE; determining that there are no 2G/3G cells belonging to the suitable location areas based on a current location of the UE; identifying a target 2G/3G cell in a location area associated with the cuttent location of the UE but not part of the 2G/3G cells belonging to the suitable location areas; and enabling a signaling connection to be established between the UE and the first MSCl via a second mobile switching center, MSC2, where the second MSC2 interfaces with a base station controller, BSC2, or a radio network controller, RNC2, that manages the target 2G/3G cell, where the signaling connection allows the MT call to be established with the UE.