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AKA in 2G/3G mixed networks

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3GPP AKA in 2G/3G mixed networks, 2G ME (with USIM support) and UICC, 2G HLR, 2G VLR/SGSN, 2G RAN

2G ME and UICC/USIM – Scenario D'

ICC is 3G, ME, BSS, VLR/SGSN and HLR/AuC are 2G. The situation is actually very similar to scenario C', but here the 2G HLR/AuC is delivering the necessary 2G triplets directly.

This mixed network environment requires the virtual 2G mode in the USIM, indicated by service no. 38. As a 2G BSS is involved, service no. 27 is also necessary. If the USIM does not support services no. 27 and no. 38, network access is not possible.