Patent ID: 8401552

Claim:
In a telecommunications network including a radio access network comprising a plurality of base stations, each defining a cell, for wirelessly transmitting data that is receivable by one or more mobile terminals, wherein at least one of the base stations, being a home base station, is an IMS-enabled Home Node B (HNB) in communication with a core component of the telecommunication network via an IP server, a method of validating a request to register a mobile terminal with the HNB, the method comprising: obtaining an identifier of the last known cell in which the mobile terminal was registered, together with an age associated with that registration; comparing the last known cell identifier and the associated age with the HNB identity; and using the comparison to decide whether or not to accept the request to register the mobile terminal, wherein the HNB transmits the request to register the mobile terminal to the IP server, wherein the IP server transmits a validation request to a verification server, wherein the verification server transmits a last known cell identifier request to obtain the last known cell identifier and performs the comparison upon receiving requested information, and wherein, after receiving the validation request, the verification server selects a communication connection to the mobile terminal and transmits a request to obtain a current serving cell identifier for the mobile terminal.