EXTRACTION OF PROTECTION KEY IN DOUBLE CONNECTION Russian patent published in 2020 - IPC H04L29/06 H04W12/04 H04W76/15 H04W76/19 

FIELD: electrical communication engineering.

SUBSTANCE: invention relates to mobile communication. Disclosed is a secondary base station apparatus for providing an updated secondary security key for a secondary base station, wherein the secondary base station apparatus comprises: a transmitter configured, during operation, to transmit to the master base station a request to change the secondary security key when the counter (COUNT) value exceeds a threshold value; receiver, configured during operation to receive from master base station updated secondary security key for secondary base station, wherein the updated secondary security key is extracted at the master base station using the increased novelty counter and the current active security key of the master base station without updating the current active security key of the master base station; and a control circuit configured, during operation, to calculate a new encryption key for communication with the mobile terminal using the updated secondary security key.

EFFECT: technical result is provision of updated secondary protection key for secondary base station.

14 cl, 16 dwg