Patent ID: 11870803
Assignee: SUN PATENT TRUST
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An integrated circuit for controlling a master base station, the integrated circuit comprising:
receiving circuitry, which, in operation, receives from a secondary base station a change request of a secondary security key when a value of a COUNT exceeds a threshold value, wherein the secondary security key is a security key for the secondary base station;
control circuitry, which, in operation, increments a freshness counter and derives an updated secondary security key for the secondary base station by using the incremented freshness counter and a currently active security key of the master base station without refreshing the currently active security key of the master base station; and
transmitting circuitry, which, in operation, transmits the updated secondary security key to the secondary base station.