Importance

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Abstract

In a cellular radio communications network a plurality of mobile switching centers have data access to a subscriber interrogation point which maintains a database identifying the home exchange of a plurality of mobile stations, the home exchanges of which are within a given region. When a roaming mobile subscriber seeks to register with a visited exchange, that exchange contacts a subscriber interrogation point identified in its own database as being associated with the roaming mobile in order to locate within the database of the subscriber interrogation point the home exchange of the mobile seeking to register. Maintenance of the home exchange identification information in the database of a subscriber interrogation point, rather than in the database of each potentially visited exchange, greatly simplifies database maintenance when the home exchange of a mobile station is changed.

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First Claim