US 11,785,510 B2
Communication system
Vivek Sharma, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Filed by NEC Corporation, Tokyo (JP)
Filed on Aug. 19, 2022, as Appl. No. 17/891,256.
Application 17/891,256 is a continuation of application No. 17/350,514, filed on Jun. 17, 2021, granted, now 11,457,387.
Application 17/350,514 is a continuation of application No. 17/031,412, filed on Sep. 24, 2020, granted, now 11,071,022, issued on Jul. 20, 2021.
Application 17/031,412 is a continuation of application No. 16/852,135, filed on Apr. 17, 2020, granted, now 10,820,240, issued on Oct. 27, 2020.
Application 16/852,135 is a continuation of application No. 16/267,091, filed on Feb. 4, 2019, granted, now 10,716,035, issued on Jul. 14, 2020.
Application 16/267,091 is a continuation of application No. 15/851,597, filed on Dec. 21, 2017, granted, now 10,237,787, issued on Mar. 19, 2019.
Application 15/851,597 is a continuation of application No. 15/349,626, filed on Nov. 11, 2016, granted, now 9,913,177, issued on Mar. 6, 2018.
Application 15/349,626 is a continuation of application No. 14/761,363, granted, now 9,526,002, issued on Dec. 20, 2016, previously published as PCT/JP2013/083535, filed on Dec. 10, 2013.
Claims priority of application No. 1300884 (GB), filed on Jan. 17, 2013.
Prior Publication US 2022/0394567 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/30 (2006.01); H04W 36/00 (2009.01); H04W 12/04 (2021.01); H04W 12/033 (2021.01); H04W 12/037 (2021.01); H04W 12/041 (2021.01); H04W 12/0431 (2021.01); H04W 12/0433 (2021.01); H04W 12/02 (2009.01); H04W 16/32 (2009.01); H04W 84/04 (2009.01); H04L 9/08 (2006.01)
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
OG exemplary drawing
 
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.