CPC H04L 63/205 (2013.01) [H04W 12/041 (2021.01); H04W 12/106 (2021.01); H04W 12/108 (2021.01)] | 18 Claims |
1. A method of operating a user equipment (“UE”) comprising:
establishing a radio resource control (“RRC”) connection with a source base station;
subsequent to establishing the RRC connection, sending an indication of a security capability of the UE to the source base station;
subsequent to sending the indication, receiving a non-access stratum (“NAS”) message from the source base station, the NAS message includes an identifier of a selected security algorithm;
responsive to receiving the NAS message, generating an access stratum security key based on the identifier of the selected security algorithm;
generating an RRC integrity token using the selected security algorithm and the access stratum key;
in response to a link failure between the UE and the source base station, transmitting the RRC integrity token to a target base station, wherein the source base station then receives the RRC integrity token from the target base station and verifies the RRC integrity token.
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