Section: 6.3.6 Reporting authentication failures from the SGSN/VLR to the HLR
Content: The purpose of this procedure is to provide a mechanism for reporting authentication failures from the serving environment back to the home environment. The procedure is shown in Figure 13. Figure 13: Reporting authentication failure from VLR/SGSN to HLR The procedure is invoked by the serving network VLR/SGSN when the authentication procedure fails. The authentication failure report shall contain: 1. Subscriber identity; 2. Failure cause code. The possible failure causes are either that the network signature was wrong or that the user response was wrong; 3. Access type. This indicates the type of access that initiated the authentication procedure; 4. Authentication re-attempt. This indicates whether the failure was produced in a normal authentication attempt or it was due to an authentication reattempt (there was a previous unsuccessful authentication). Details are provided in subclause 6.3.6.1; 5. VLR/SGSN address; 6. . This number uniquely identifies the specific AV that failed authentication. The HE may decide to cancel the location of the user after receiving an authentication failure report and may store the received data so that further processing to detect possible fraud situations could be performed.