US 12,137,116 B2
Security key derivation in dual connectivity
Prateek Basu Mallick, Hessen (DE); and Joachim Loehr, Hessen (DE)
Assigned to Sun Patent Trust, New York, NY (US)
Filed by Sun Patent Trust, New York, NY (US)
Filed on Aug. 4, 2023, as Appl. No. 18/365,609.
Application 18/365,609 is a continuation of application No. 17/899,485, filed on Aug. 30, 2022, granted, now 11,870,803.
Application 17/899,485 is a continuation of application No. 17/080,345, filed on Oct. 26, 2020, granted, now 11,463,471, issued on Oct. 4, 2022.
Application 17/080,345 is a continuation of application No. 16/459,170, filed on Jul. 1, 2019, granted, now 10,848,518, issued on Nov. 24, 2020.
Application 16/459,170 is a continuation of application No. 16/110,416, filed on Aug. 23, 2018, granted, now 10,397,269, issued on Aug. 27, 2019.
Application 16/110,416 is a continuation of application No. 15/121,357, granted, now 10,116,685, issued on Oct. 30, 2018, previously published as PCT/EP2015/054400, filed on Mar. 3, 2015.
Claims priority of application No. 14001067 (EP), filed on Mar. 21, 2014.
Prior Publication US 2023/0379357 A1, Nov. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 29/06 (2006.01); H04L 9/40 (2022.01); H04W 12/04 (2021.01); H04W 12/082 (2021.01); H04W 76/15 (2018.01); H04W 76/19 (2018.01)
CPC H04L 63/1441 (2013.01) [H04L 63/06 (2013.01); H04L 63/068 (2013.01); H04L 63/1416 (2013.01); H04W 12/04 (2013.01); H04W 12/082 (2021.01); H04W 76/15 (2018.02); H04W 76/19 (2018.02); H04L 2463/061 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An integrated circuit for controlling a secondary base station, the integrated circuit comprising:
transmitting circuitry, which, in operation, transmits a change request of a secondary security key to a master base station when a value of a COUNT exceeds a threshold value, wherein the secondary security key is a security key for the secondary base station;
receiving circuitry, which, in operation, receives from the master base station an updated secondary security key, the updated secondary security key being derived at the master base station using an incremented freshness counter and a currently active security key of the master base station, without having to refresh the currently active security key of the master base station; and
control circuitry, which, in operation, computes a new encryption key for communication with a mobile terminal using the updated secondary security key.