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Obtaining a PLMN ID for a Private Network

Introduction to PLMN IDs

A Public Land Mobile Network (PLMN) ID is a globally unique identifier that allows mobile devices to recognize and connect to mobile networks. In 5G private networks, having a correct PLMN ID is critical for ensuring proper network identification and operation.

A PLMN ID consists of two parts:

  • Mobile Country Code (MCC): A three-digit code that identifies the country.
  • Mobile Network Code (MNC): A two- or three-digit code that identifies the network operator within that country.

Each subscriber in a mobile network has a unique identifier called the International Mobile Subscriber Identity (IMSI). The IMSI is composed of the PLMN ID and a subscriber-specific identifier.

How PLMN IDs Are Assigned

PLMN IDs are regulated by the International Telecommunication Union (ITU). Because there is a limited pool of available PLMN IDs, obtaining one through the ITU can be challenging, particularly for private network operators.

Options for Private Networks

There are several approaches available for private networks to acquire a PLMN ID:

  1. Using the Reserved PLMN ID: The Mobile Country Code 999 is globally reserved for private networks. Network operators can choose an MNC (e.g., 01, 123) to create a PLMN ID such as 999-01 or 999-123. This method is ideal if your network does not require a globally unique identifier.

  2. National Authority Assignments: In some countries, a designated national regulatory body assigns PLMN IDs to private networks. If your country uses this approach, you must apply for a PLMN ID through the appropriate national channels.

  3. Alliance for Private Networks: The Alliance for Private Networks offers a Network Identifier Program that provides the temporary use of PLMN IDs for private networks. This program allows private network operators to obtain a "slice" of a PLMN ID. They ensure that subscribers from different private networks are uniquely identified and do not overlap.

  4. ITU Assignments: For private networks that require a globally unique identifier, a PLMN ID can be obtained via the ITU process. This typically involves coordination with your local regulatory authority and compliance with international standards.

Note on Configuration

Once you have obtained a PLMN ID for your private network, you can configure it in Ella Core via the Operator API or the user interface. The PLMN ID can only be updated when no subscribers are created.