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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 400<br />

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

17.4 Subscriber Identity procedure<br />

In the subscriber identity procedure the IMSI of the subscriber is retrieved from the HLR. The procedure is<br />

shown in figure 17.4/1.<br />

1) Identity request<br />

2) MAP_SEND_IMSI<br />

3) MAP_SEND_IMSI_ACK<br />

4) Identity confirm<br />

¸¹ ¸¹ ¸¹<br />

· 20& · · 9/5 · · +/5 ·<br />

· · · · · ·<br />

º» º» º»<br />

· · ·<br />

¼ !½ ·<br />

· ¼ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ!½<br />

· · ·<br />

· ¼ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÒ<br />

¼ ½ ·<br />

· · ·<br />

Figure 17.4/1: The subscriber identity procedure<br />

17.4.1 Subscriber identity procedure in the HLR<br />

Opening of the dialogue is described in the macro Receive_Open_Ind in subclause 21.1, with outcomes:<br />

- reversion to version one procedure;<br />

- procedure termination; or<br />

- dialogue acceptance, with proceeding as below.<br />

When receiving the MAP_SEND_IMSI indication, the HLR will check the parameters and data in the<br />

primitive. Data errors are reported as an unexpected data value error or a data missing error depending on<br />

the nature of the error.<br />

If the subscriber is known in the HLR, the IMSI is fetched from the database and sent to the VLR. If the<br />

MSISDN cannot be identified, unknown subscriber indication is passed to the VLR.<br />

The subscriber identity procedure in the HLR is shown in figure 17.4/2.

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