# ecgi lte formula

The ECGI (E-UTRAN Cell Global Identity) in LTE (Long-Term Evolution) is used to uniquely identify a cell within the LTE network. It is composed of the PLMN-Id (Public Land Mobile Network Identity) and the Cell Identity (CI). The formula for calculating ECGI in LTE is as follows:

����=����−��×2563+��*ECGI*=*PLMN*−*Id*×2563+*CI*

Here, ����−��*PLMN*−*Id* is the Public Land Mobile Network Identity, and ��*CI* is the Cell Identity. The multiplication by 25632563 is due to the fact that CI is a 28-bit field, and it's represented as a decimal value. Each digit in the decimal representation of the CI corresponds to a power of 256.

Let's break down the components:

**PLMN-Id (MCC-MNC):**The PLMN-Id is obtained by concatenating MCC and MNC. For example, if MCC is 310 (United States) and MNC is 260 (T-Mobile), then the PLMN-Id is 310260.- MCC (Mobile Country Code): A three-digit code that uniquely identifies a country within the ITU E.212 numbering plan.
- MNC (Mobile Network Code): A two or three-digit code that uniquely identifies a mobile network within a country.

**CI (Cell Identity):**- CI is a 28-bit field that uniquely identifies a cell within a PLMN. It is used to distinguish cells with the same PLMN-Id. The CI is assigned by the network operator.

**Multiplication by 25632563:**- The reason for multiplying by 25632563 is related to the way the CI is represented. In LTE, the CI is typically represented in decimal form, and each digit corresponds to a power of 256. Multiplying by 25632563 is equivalent to shifting the CI by 24 bits to the left.