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Public land mobile network

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In telecommunication, a Public Land Mobile Network (PLMN) is a combination of wireless communication services offered by a specific operator in a specific country[1][2]. A PLMN typically consists of several cellular technologies like GSM/2G, UMTS/3G, LTE/4G, offered by a single operator within a given country, often referred to as a cellular network.

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PLMN codeEdit

A PLMN is identified by a globally unique PLMN code, which consists of a MCC (Mobile Country Code) and MNC (Mobile Network Code). Hence, it is a five- to six-digit number identifying a country, and a mobile network operator in that country, usually represented in the form 001-01 or 001-001.

A PLMN is part of a

Leading Zeros in PLMN codesEdit

Note that an MNC can be of two-digit form and three-digit form with leading zeros, so that 01 and 001 are actually two distinct MNCs. Hence the PLMNs 001-02 and 001-002 would be in the same country, but belong to two completely distinct operators (02 and 002). From PLMN assignments, it is apparent that such dualities of two-digit and three-digit MNCs with the same number value are avoided (see the List of Mobile Country Codes and Mobile Network Codes). An example for an actual three-digit MNC with leading zeros is 750-001, of the operator Cable and Wireless South Atlantic Ltd (Falkland Islands).

PLMN code and IMSIEdit

The IMSI, which identifies a SIM or USIM for one subscriber, typically starts with the PLMN code. For example, an IMSI belonging to the PLMN 262-33 would look like 262330000000001. Mobile phones use this to detect Roaming, so that a mobile phone subscribed on a network with a PLMN code that mismatches the start of the USIM's IMSI will typically display an "R" on the icon that indicates connection strength.

PLMN servicesEdit

A PLMN typically offers the following services to a mobile subscriber:

The availability, quality and bandwidth of these services strongly depends on the particular technology used to implement a PLMN.

ReferencesEdit