Patent ID: 11877150
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. The information obtaining method according to claim 6, wherein after the receiving, by the target mobility management network element, a second root key and first indication information from the source mobility management network element, the method further comprises:
decrypting, by the target mobility management network element based on the second root key, the first non-cleartext information element that is security protected in the first initial NAS message; and
the sending, by the target mobility management network element, second indication information and third indication information to the terminal based on the first indication information comprises:
upon determining that the target mobility management network element fails to decrypt the first non-cleartext information element that is security protected in the first initial NAS message, skipping, by the target mobility management network element, an authentication procedure and sending the second indication information and the third indication information to the terminal based on the first indication information.