METHOD AND DEVICE FOR OBTAINING SECURITY CONTEXT AND COMMUNICATION SYSTEM Russian patent published in 2023 - IPC H04W12/10 

FIELD: wireless communication systems

SUBSTANCE: after switching the communication of the user equipment UE from communication with the 4G communication system to communication with the 5G communication system, the first AMF providing the access and mobility control service for the UE in the 5G communication system can obtain the security context for the specified UE from the second AMF in the 5G communication system. The UE transmits the first registration request message to the first AMF, where the first registration of request message carries the second registration request message. The first AMF sends a second registration of request message to the second AMF, where the integrity of the second registration of request message is protected using the original (own) security context between the specified UE and the second AMF. Upon successful verification of the integrity of the second registration of request message, the second AMF returns the security context of the UE in question to the first AMF.

EFFECT: increasing of the probability of obtaining the security context of the user equipment.

61 cl, 10 dwg