Patent ID: 7013139

Claim:
A method of migrating subscriber data associated with a plurality of subscriber identities from a first Home Location Register (HLR) node to a second HLR node, said HLR nodes being arranged such that subscriber data is distributed between said nodes, each node supporting some subscriber data as active data and some subscriber data as standby data, said standby data of each node corresponding to some active subscriber data of the other node, said nodes being connected by a fixed network, wherein, for each subscriber data associated with a subscriber identity or a small group of subscriber identities to be migrated from said first HLR node to said second HLR node, the method comprises the steps of: A. at said first HLR node, changing a state of said subscriber data from active to standby; and B. transferring said subscriber data from said first HLR node to said second HLR node by way of changing at said second HLR node the state of the subscriber data from standby to active, wherein active data of the first HLR node which is not to be migrated or is to be migrated but has not yet been migrated is maintained as active while said subscriber data currently being migrated is processed according to steps A and B.