Patent ID: 11870765
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A network node of a serving public land mobile network (PLMN) associated with a user equipment (UE), the network node comprising:
a processor; and
a memory, the memory containing instructions executable by the processor wherein the network node is configured to:
receive a public identifier corresponding to the UE, wherein the UE has a home PLMN and the serving PLMN is not the UE's home PLMN;
forward the public identifier to a home PLMN of the UE;
receive from the home PLMN an international mobile subscriber identity (IMSI) in response to the forwarding of the public identifier, wherein the IMSI uniquely identifies the UE and is a secret that is shared between the UE and at least the home PLMN;
receive authentication information from the home PLMN, the authentication information allowing the serving PLMN to perform authentication of the UE;
use the authentication information to determine, by the serving PLMN, that the UE is successfully authenticated; and
perform an operation related to charging control of the UE using the IMSI.