Importance

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Abstract

A gateway location register (GLR) can restore data by sending a reset message to all of the visitor location registers (VLR) associated with the GLR. Alternatively, the data in the GLR can be restored when a request for a roaming number is sent to the GLR from a home location register (HLR). In any case the location information is restored from the VLR and the subscriber profile from the HLR. If the GLR has a backup memory, the GLR can forward a request for a roaming number to a VLR which is indicated by the backup memory as serving the mobile subscriber associated with the roaming number request received from the HLR. If the information contained in the backup memory is incorrect, the GLR can send a request to restore data to all VLRs associated with the GLR. Further, the GLR, upon receipt of a roaming number request for a subscriber whose serving VLR is unknown, the GLR can send an error indication to the HLR and wait for a location update from a serving VLR. In addition, if the backup data is incorrect or non-existent, the GLR can send a request for a roaming number to all its associated VLRs which have not yet received the request.

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First Claim