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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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20.4.3 Procedures in the HLR<br />

Page 595<br />

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

When receiving the MAP_READY_FOR_SM indication, the HLR will check the contents. Data errors are<br />

reported to the VLR as an unexpected data value or a data missing error depending on the error. If the<br />

HLR does not support the MNRF, MCEF, and MWD a facility not supported error is reported to the VLR. If<br />

the IMSI is unknown an unknown subscriber error is reported to the VLR. Otherwise an acknowledgement<br />

is returned to the VLR.<br />

If neither the mobile station not reachable flag (MNRF) or the memory capacity exceeded flag (MCEF) is<br />

set, the HLR sets a timer and waits for it to expire. This ensures that in the race situation the<br />

MAP_REPORT_SM_DELIVERY_STATUS service (as described in the subclause 20.6) for the same<br />

subscriber can be carried out when delayed in the GMSC.<br />

If the Alert Reason indicates the mobile present situation, or when the update location procedure has been<br />

successfully completed or Supplementary Service Control request is received, the mobile station not<br />

reachable flag is cleared and the service centre alert procedure is initiated. If the memory capacity<br />

exceeded flag is set, the mobile station not reachable flag is cleared but the alert procedure is not started.<br />

If the Alert Reason indicates the memory available situation, the HLR initiates the alert procedure. The<br />

mobile station not reachable and memory capacity available flags are cleared.<br />

If the MAP_REPORT_SM_DELIVERY_STATUS indication is received and it indicates the successful<br />

transfer of the mobile terminated short message, the HLR initiates the alert procedure described in the<br />

subclause 21.10 and clears MCEF and MNRF flags.<br />

The short message alert procedure in the HLR is shown in figures 20.4/6 and 21.10/2.

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