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...http://www.google.fr/patents/US6671507?utm_source=gb-gplus-shareBrevet US6671507 - Authentication method for inter-system handover between at least two radio communications systems
Authentication method for inter-system handover between at least two radio ...
