Network identity parameters mainly include
- Cell Global Identity (CGI)
- Base Station Identity Code (BSIC)
CGI=MCC+MNC+LAC+CI
Once MS receives SYS INFO, it decodes the CGI information, and decides whether it can stay in the cell according to the MCC and MNC indicated by CGI.
At the same time, it judges whether the current location area is changed, so as to decide whether to execute location update. During the location update process, MS will report the new LAI to the network, so that the network can know the LA in which MS is currently located.
MCC (Mobile Country Code)
- Definition: MCC consists of 3 decimal numbers. It indicates the home country of the mobile subscriber.
- Format: MCC is composed of 3 decimal numbers. The coding range is decimal 000~999.
- Location: Cell Attributes
Mobile Network Code MNC
- Definition: MNC is used to uniquely identify a specific GSM PLMN network in a certain country (decided by MCC).
- Format: MNC is composed of two decimal numbers. The coding range is decimal 00~999.
- Location: Cell Attributes
Location Area Code LAC
- Definition: To locate the location of MS, the whole area covered by each GSM PLMN is divided into different location areas. LAC is used to identify different location areas.
- Format: LAI contains LAC, which is composed of two bytes. LAC adopts hexadecimal coding. The available range is from 0001H to FFFEH. The code 0000H and FFFFH cannot be used (please refer to specification GSM0303, 0408, and 1111). One location area can contain one or more cells.
- Location: Cell Attributes
Cell Identity CI
- Definition: To uniquely identify each cell in the GSM PLMN, the network operator needs to allocate one code for each cell, which is the cell identity (CI). Cell identity, together with LAI, is used for identity of each cell in the world.
- Format: CI is composed of 16 bits, The available range is 0~65535.
- Location: Cell Attributes
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