Mobile entities

• Network options for the AuC are:

• To transmit the subscriber identity key to the VLR

which requests authentication information, and for

the MSC or VLR to generate the authentication data

and cipher key.

• To generate the authentication data and cipher key

and transmit them to the VLR which requests

authentication information.

• The AuC communicates only with its associated HLR over

an interface denoted the H interface.

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