| 摘要 |
The interoperation between UMTS and GSM in the handover context includes the following method steps. An authentication vector is first generated by the UMTS HLR/AuC and various UMTS authentication parameters (XRES, CK, IK and AUTN) are derived. The authentication vector is distributed, depending on the type of VLR that requests authentication vectors, whether it is a UMTS VLR or a GSM VLR. The UMTS user is authenticated either in UTRAN or in GSM BSS. When a UMTS user is attached through a UTRAN, the controlling VLR initiates UMTS authentication and key agreement. When a UMTS user is attached through a GSM BSS, the controlling VLR initiates GSM authentication and key agreement. This is done using a UMTS authentication vector or a GSM authentication vector, depending on the type of VLR controlling the GSM BSS. The user is then handed over from one system to the other.
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