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AKA in 2G/3G mixed networks

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3GPP AKA in 2G/3G mixed networks, 3G ME and SIM, 2G or 3G HLR, 2G VLR/SGSN, 2G RAN

3G ME and SIM – Scenario M

ICC, BSS and VLR/SGSN are 2G, the ME is 3G. This applies when e.g. a 2G subscriber with a 3G ME roams in a 2G network.

2G AKA is performed just like in a plain 2G situation.

A 2G/3G dual mode ME is transparent for 2G AKA.

No service with a 3G single mode ME.