The data stored in location registers are automatically updated in normal operation; the main information stored in a location register defines the location of each mobile station and the subscriber data required to handle traffic for each mobile subscriber. The loss or corruption of these data will seriously degrade the service offered to mobile subscribers; it is therefore necessary to define procedures to limit the effects of failure of a location register, and to restore the location register data automatically. This TS defines the necessary procedures.
The basic principle is that restoration should be based on radio contact to avoid faulty data being spread in the system.
Subscriber data for supplementary services must also be correctly restored, although the impact on service of corruption of supplementary service data is less severe.
Procedures for supporting these functions are defined in TS 09.02
and TS 09.60