What is PLMN Code in LTE?
Today, we are going to explore the concept of the PLMN code in LTE. As we’ve discussed in previous articles, each network in a cellular system is identified by a unique identifier. The PLMN (Public Land Mobile Network) code is one such identifier that is essential for mobile network operations. I will explain to you exactly what it is and why it matters for LTE networks.
Understanding PLMN Code
The PLMN code is a unique code used to identify a specific mobile network operator. This code is essential for connecting mobile devices to the correct network when roaming between different regions or when multiple networks are present. It consists of two parts:
- Mobile Country Code (MCC): The MCC is a 3-digit code that identifies the country where the network operator is located. For example, the MCC for the United States is “310”.
- Mobile Network Code (MNC): The MNC is a 2 or 3-digit code that identifies the specific operator within a country. For example, “260” could represent a particular operator in Germany.
So, when combined, the PLMN code might look something like “310-260,” which would represent a specific mobile network in the United States. This combination helps your device connect to the correct network when you are using your mobile service, whether you’re at home or roaming.
Role of PLMN Code in LTE
In LTE, the PLMN code is used for several key functions, including:
- Network Selection: Your device uses the PLMN code to search and select the most appropriate network in your area. For instance, if you’re traveling to another country, your device will check the PLMN codes of available networks to determine which operator to connect to.
- Roaming: When you roam, the PLMN code ensures that your device connects to a network that has an agreement with your home operator, allowing you to use services like voice, text, and data even in a foreign network.
- Subscriber Authentication: The PLMN code is used during the subscriber authentication process to ensure your device is connecting to the correct mobile network for authorized use.
Example of PLMN Code Usage
Let’s say you are in the United Kingdom, and you are trying to use your mobile phone. Your device will look for available networks and identify them by their PLMN codes. If you are connected to “234-30,” this represents an operator in the UK. If you’re traveling to a different country, such as France, your device will look for networks with the corresponding PLMN codes, ensuring you connect to a compatible network there.
Why is PLMN Code Important for LTE Networks?
The PLMN code helps ensure that users are connected to the right network, even when they are outside their home country or region. This is crucial for ensuring seamless service continuity, especially when switching between local and roaming networks. Without the PLMN code, it would be difficult for mobile devices to identify and connect to the appropriate operator in different regions.
As we discussed earlier, the PLMN code is just one element of the larger network infrastructure in LTE. It works hand-in-hand with other identifiers like the IMSI (International Mobile Subscriber Identity) to ensure smooth communication and service delivery across cellular networks.