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

2G ME and UICC/SIM – Scenario I

ME, BSS, VLR/SGSN and HLR/AuC are 2G, only the ICC is a 3G UICC.

This applies when in the start-up 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.

With the UICC virtually being a SIM, this case can be seen as entirely 2G.