CPC H04W 36/0038 (2013.01) [H04W 12/02 (2013.01); H04W 12/033 (2021.01); H04W 12/037 (2021.01); H04W 12/04 (2013.01); H04W 12/041 (2021.01); H04W 12/0431 (2021.01); H04W 12/0433 (2021.01); H04W 16/32 (2013.01); H04L 9/0861 (2013.01); H04L 2209/24 (2013.01); H04W 36/0069 (2018.08); H04W 84/045 (2013.01)] | 4 Claims |
1. A user equipment, UE, configured for simultaneous connection to a master base station and to a secondary base station, the UE comprising:
a controller; and
a transceiver;
wherein the controller is configured to:
derive a security key of the master base station;
derive, using the derived security key of the master base station, a security key of the secondary base station;
derive, using the security key of the secondary base station, a user plane security key for use in protection of user plane traffic between the UE and the secondary base station;
control the transceiver to receive a Radio Resource Control, RRC, message from the master base station;
derive, using the derived security key of the master base station, an updated security key of the secondary base station after receiving the RRC message; and
derive, using the updated security key of the secondary base station, an updated user plane security key for use in protection of user plane traffic between the UE and the secondary base station.
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