公开(公告)号：US11496882B2

公开(公告)日：2022-11-08

申请号：US16968624

申请日：2019-02-15

Applicant: NEC Corporation

Inventor： Sheeba Backia Mary Baskaran ,  Anand Raghawa Prasad ,  Sivakamy Lakshminarayanan ,  Sivabalan Arumugam ,  Hironori Ito ,  Takihito Yoshizawa

IPC: H04W60/00 ,  H04W8/20 ,  H04W8/08 ,  H04W48/16 ,  H04L101/654

Abstract: Methods for (i) finding/discovering the right UDM instances and (ii) ensuring the UDM instance security are provided. The method for (i), includes the steps of: (i-1) pre-provisioning of UDM instance discovery information/parameters to the UE/USIM, (i-2) sending the UDM instance discovery related parameters to a core network element, and (i-3) discovering the right UDM instance at the core network element based on the discovery parameters and related routing information either at the UDM consumer/NRF. The method for (ii) includes the steps of: (ii-1) Secured choice of parameter for UDM instance discovery (e.g. UDM instance identifier) to the core network element and (ii-2) the secured UDM instance identifier generation and management at the UDM to prevent attack on UDM instances. Also a method to identify the cleartext IMSI/SUPI is provided for the re-authentication scenario along with the relevant procedures.