Patent ID: 8520596

Claim:
A mobility management entity (MME) for setting up a call comprising: a first network interface which receives a tracking area update (TAU) request from a user equipment (UE); a processing unit which translates the TAU request into a location area update (LAU) request wherein the processing unit uses a target 2G/3G cell selected by an evolved NodeB (eNB) for handover where the target 2G/3G cell belongs to at least one of the LAIs indicated by the suitable LAIs information; and a second network interface in communication with the processing unit which sends the LAU request to a mobile switching center (MSC) selected as a tracking MSC thereby establishing the MME as a network node through which the UE is paged, the second network interface receiving a LAU response from the tracking MSC that comprises at least information identifying one or more suitable location area identifiers (LAI(s)) to which handover is allowed and Network Resource Identifier (NRI) information, where the information indicates that the tracking MSC controls the suitable LAI(s), and the processing unit translating the LAU response into a TAU response which is sent through the first network interface to the UE.