28 Restoration of data in the CSS

23.0073GPPRelease 18Restoration proceduresTS

28.1 Restart of the CSS

The periodic backup of CSS data to non-volatile storage is mandatory.

When a CSS restarts after failure it shall perform the following actions for the subscriber data records that have been affected by the CSS fault:

– reload all data from the non-volatile back-up;

– send a "Reset" message to each VLR where one or more of its MSs may be registered to the CSS. This causes each VLR concerned to mark each relevant roaming user record "Location Information Not Confirmed by CSS", and

– send a "Reset" message to each SGSN where one or more of its MSs may be registered to the CSS. This causes each SGSN to mark each relevant MM context "Location Information Not Confirmed by CSS".

– send a "Reset" message to each MME where one or more of its UEs may be registered to the CSS.