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

Claim 0:
1. A method performed by a network node of a serving public land mobile network (PLMN) associated with a user equipment (UE), the method comprising:
receiving 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;
forwarding to the UE's home PLMN the public identifier corresponding to the UE;
receiving from the UE's home PLMN an international mobile subscriber identity (IMSI) in response to forwarding the public identifier to the UE's home PLMN, wherein the IMSI uniquely identifies the UE and is a secret that is shared between the UE and at least the UE's home PLMN;
receiving authentication information from the home PLMN, the authentication information allowing the serving PLMN to perform authentication of the UE;
using the authentication information to determine, by the serving PLMN, that the UE is successfully authenticated; and
performing an operation related to charging control using the IMSI.