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GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

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<strong>GSM</strong> <strong>09.02</strong> <strong>Version</strong> <strong>5.3.0</strong>: August 1996<br />

VLR Restoration<br />

The restore data procedure is invoked by the VLR to update subscriber data in the HLR and VLR after<br />

VLR restart, when the VLR receives a MAP_PROVIDE_ROAMING_NUMBER indication from the HLR for<br />

an unidentified MS, or for a known MS with the indicator "Confirmed by HLR" set to "Not Confirmed". The<br />

procedure in the VLR is described in figure 18.2/6.<br />

If the dialogue with the HLR is opened successfully, the process waits for a<br />

MAP_ACTIVATE_TRACE_MODE indication primitive or one or more MAP_INSERT_SUBSCRIBER_DATA<br />

indication primitives containing the subscriber data. When the tracing activation has been completed if<br />

necessary and all the subscriber data have been received, the dialogue with the HLR is terminated by a<br />

MAP_RESTORE_DATA confirmation. If the confirmation contains no errors, the VLR stores the subscriber<br />

data in the IMSI record, updates the HLR number and the MS Not Reachable Flag which is used for SMS<br />

(if appropriate), and sets the indicator "Confirmed by HLR" to "Confirmed". The status of the indicators<br />

"Confirmed by radio contact" and "Location Information Confirmed in HLR" remains unchanged.<br />

The procedure in the VLR is then terminated. For a description of the procedures in the HLR refer to<br />

subclause 16.3.

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