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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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Page 490<br />

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

19.3.3 Procedures in the VLR<br />

Supplementary service activation<br />

When receiving the MAP_ACTIVATE_SS indication, the MAP user in the VLR transfers the information to<br />

the HLR in the MAP_ACTIVATE_SS request without checking the contents of the service indication.<br />

The VLR may then receive the MAP_GET_PASSWORD indication. This information is transferred to the<br />

MSC in the MAP_GET_PASSWORD request. If a MAP_GET_PASSWORD confirm primitive is received<br />

from the MSC, the VLR initiates the MAP_GET_PASSWORD response towards the HLR.<br />

The VLR will receive the MAP_ACTIVATE_SS confirm from the HLR. The MAP user in the VLR shall<br />

transfer the information contained in this primitive to the MSC in the MAP_ACTIVATE_SS response without<br />

checking its contents.<br />

For call independent SS operations, each message shall only contain a single component. Messages which<br />

contain more than one component will be stopped at the air interface (as specified in TS <strong>GSM</strong> 09.11).<br />

Error handling<br />

The handling of MAP_P_ABORT, MAP_U_ABORT, MAP_NOTICE and unexpected MAP_CLOSE in this<br />

procedure is identical to the handling in the Registration procedure in the VLR, see subclause 19.1.3 of this<br />

ETS.<br />

The activation procedure in the VLR is shown in figure 19.3.3/1.

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