Telefonaktiebolaget Lm Ericsson (publ)

Rolf Elis Gustaf Hansson

Hans-Olof Sundell

Bernt Karlsson

The present invention is a method and system for updating location information of mobile stations. A mobile station moves from an area controlled by a first mobile services switching center (MSC) to an area controlled by a second MSC. The mobile station then registers with the second MSC, and, in response, the mobile station is added to a second MSC database. The second MSC recalculates a second MSC checksum to include the newly registered mobile station. Next, the HLR sends an HLR checksum to the second MSC. The second MSC compares the HLR checksum and the second MSC checksum. If the checksums are equal, then the second MSC sends the location registration signal to the mobile station. If the checksums are unequal, then the second MSC sends an error signal to the HLR, and also sets the second MSC database equal to a previous correct database. Next, the HLR sends all logged erasures to the second MSC. The second MSC then appropriately subtracts and adds each erased and newly registered mobile station to the database of the second MSC and recalculates the second MSC checksum until both checksums are equal.

Subscribers database proofing using a checksum in a telecommunications system

A system and method for encrypting transmissions between a plurality of communication nodes and a mobile station, wherein the algorithm for generating an encryption key resides within a first communications node. A second communications node requiring encryption between the node and a mobile station requests an encryption key from the first communications node through a PMAP interface interconnecting the nodes. The first node generates the encryption key and a countersign and transmits them back to the second communications node. The transmitted countersign is compared with a countersign provided by the mobile station, and if they match, transmissions from the second communications node to the mobile station are encrypted using the provided key.

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Kungsängen, Sweden

Rolf Elis Gustaf Hansson