The Access Security Management Entity receives the top-level keys in an access network from the HSS or HLR. For E-UTRAN access networks, the role of the ASME is assumed by the MME. The MME invokes the AKA procedures by requesting authentication vectors to the HE (Home environment). The HE sends an authentication response back to the MME that contains a fresh authentication vector, including a base-key named KASME.
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