How PLMN is stored in EHPLMN / HPLMN

Hello,

PLMN: A PLMN identity consists of a Mobile Country Code (MCC) and a Mobile Network Code (MNC). There are following type of PLMNs defined by the specifications.

• Equivalent PLMN – The EPLMN list is a list of PLMNs considered as equivalents to Registered PLMNs (RPLMNs) in terms of service provisioning. During PLMN selection, a UE preferentially selects a PLMN from the list. The EPLMN list plus RPLMN is sent from the EPC and stored in the UE during an Attach procedure and Tracking Area Update. An EPLMN list can contain more than one EPLMN.

• Home PLMN– The Home PLMN (HPLMN) is the PLMN in which the UE is defined.

• Visited PLMN– The VPLMN is the PLMN where the UE is located. A VPLMN can be the HPLMN.

• Equivalent Home PLMN– An EHPLMN is an equivalent to the HPLMN, and takes precedence over the HPLMN. The EHPLMN list is stored in the Universal subscriber identity module (USIM) of the UE. During PLMN selection, the UE takes into account both the EHPLMNs and the HPLMN that is extracted from the international mobile subscriber identity (IMSI), and preferentially selects an EHPLMN.

• Registered PLMN– The RPLMN is the PLMN on which the UE has performed a location registration successfully by Tracking Area Update.

Thanks