US 12,309,580 B2
Multicast broadcast service keys
Shu Guo, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Fangli Xu, Beijing (CN); Haijing Hu, Los Gatos, CA (US); Huarui Liang, Beijing (CN); Lanpeng Chen, Beijing (CN); Xiaoyu Qiao, Beijing (CN); and Yuqin Chen, Beijing (CN)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/755,493
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed May 7, 2021, PCT No. PCT/CN2021/092126
§ 371(c)(1), (2) Date Apr. 29, 2022,
PCT Pub. No. WO2022/233029, PCT Pub. Date Nov. 10, 2022.
Prior Publication US 2024/0187849 A1, Jun. 6, 2024
Int. Cl. H04W 12/041 (2021.01); H04W 4/06 (2009.01); H04W 12/0431 (2021.01)
CPC H04W 12/041 (2021.01) [H04W 4/06 (2013.01); H04W 12/0431 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A processor of a user equipment (UE) configured to perform operations comprising:
generating, for transmission to a network function, a protocol data unit (PDU) modification request comprising a request to join a multicast broadcast service (MBS) session;
generating a first key (KMBS-UE), wherein the KMBS-UE is generated using a primary authentication key and a temporary mobile group identification (TMGI), wherein the primary authentication key is established between the UE and a second network function;
receiving a PDU session modification complete message comprising an encrypted second key (KMBS) and a key identification (KID) corresponding to the KMBS; and
decrypting the KMBS using the KMBS-UE.