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Content for  TS 23.007  Word version:  18.5.0

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12  Restoration of Data in an SMLC (GSM only)p. 34

12.1  Restart of an SMLCp. 34

When an SMLC restarts after a failure, it performs the following actions for those of its associated LMUs whose records have been affected by the fault:
  • Reload all administered LMU data from non-volatile back-up;
  • Reinitialize other temporary data for each LMU to indicate no ongoing measurement or diagnostic activities;
  • Perform data restoration for each affected Type A and Type B LMU as described below.

12.2  Data Restoration for a Specific LMUp. 34

An SMLC may restore data for a specific LMU when the data in the SMLC or LMU is considered unreliable (e.g. if there is no communication between the SMLC and LMU for a long time or if messages received by the SMLC are inconsistent with the LMU state kept by the SMLC). To restore data for a specific LMU, the SMLC shall open a signalling connection to the LMU if this is Type A, as described in 3GPP TS 23.071 [10]. For both a Type A LMU and a Type B LMU, the SMLC shall then send an LLP Reset message to the LMU. On receiving an LLP Reset, an LMU shall cancel any LCS measurement and O&M tasks previously ordered by the SMLC and shall return an LLP Reset acknowledgement to the SMLC.
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13  Restoration of Data in an LMU (GSM only)p. 34

When an LMU restarts following a failure, it shall reinitialize all data concerning LCS measurement and O&M tasks to indicate that no tasks ordered by an SMLC are active. A Type A LMU shall then perform an "IMSI Attach". A Type A LMU shall then open a signalling connection to its controlling SMLC as described in 3GPP TS 23.071 [10]. Both a Type A LMU and a Type B LMU shall send an LLP Status Update message to their controlling SMLC containing an indication that the LMU has restarted following a failure. The SMLC shall update its data regarding the state of the LMU and shall return an LLP Update Status acknowledgment to the LMU.
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