Summary
Location area identity (LAI) is a concept used in mobile telecommunications networks. It is a unique identifier assigned to each location area of a Public Land Mobile Network (PLMN).[1]
Overview edit
This internationally unique identifier is used for location updating of mobile subscribers. It is composed of a three decimal digit mobile country code (MCC), a two to three digit mobile network code (MNC) that identifies a Subscriber Module Public Land Mobile Network (SM PLMN) in that country, and a location area code (LAC) which is a 16 bit number with two special values, thereby allowing 65534 location areas within one GSM PLMN.
Broadcast edit
The LAI is broadcast regularly through a broadcast control channel (BCCH). A mobile station (e.g. cell phone) recognizes the LAI and stores it in the SIM Card. If the mobile station is moving and notices a change of LAI, it will issue a location update request, thereby informing the mobile provider of its new LAI. This allows the provider to locate the mobile station in case of an incoming call.
See also edit
References edit
- ^ "LAI - Telecom ABC". www.telecomabc.com. Retrieved 2023-09-05.
External links edit
- Cell Phone Localization