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3GPP AKA in 2G/3G mixed networks, 2G ME (without USIM support) and UICC, 2G HLR, 3G VLR/SGSN, 2G RAN

2G ME and UICC/SIM – Scenario J

ME, BSS and HLR/AuC are 2G, ICC and VLR/SGSN are 3G. This applies when e.g. in the startup phase of a 3G network a UICC (with SIM application) is introduced as the first migration step, while the rest of the network is still 2G and a user roams into another starting 3G network with 3G VLR/SGSN and 2G BSS technology.

Since the 3G VLR/SGSN is transparent for 2G AKA and the SIM application is active on the UICC, the system works entirely like 2G.