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The network broadcasts this timer value so that a mobile station knows the periodic location update timer values. If the subscriber is moving within a single location area, there is no need to send a location update request.Ī timer controls the periodic updates and the operator of the VLR sets the timer value. Such a situation is created when a mobile is switched on but no traffic is carried, in which case the mobile is only reading and measuring the information sent by the network. Periodic location update is carried out when the network does not receive any location update request from the mobile in a specified time. Using this IMSI, the new MSC requests the subscriber data from the HLR and then updates the VLR and HLR after successful authentication. A signalling connection is established between the two MSC/VLRs and the subscriber’s IMSI is transferred from the old MSC to the new MSC. The MSC/VLR that has served the mobile phone up to this point. When the target MSC/VLR receives the request, it reads the old LAI which identifies IMSI/TMSI) and the LAI stored in the SIM card. The mobile starts a Location Update process by accessing the MSC/VLR that sent the location data.Ī channel request message is sent that contains the subscriber identity (i.e. A generic location update is performed if they are different. A Location Area Code (LAC) is only unique in a particular network.Įvery time the mobile receives data through the control channels, it reads the LAI and compares it with the LAI stored in its SIM card.A Location Area Identity (LAI) is a globally unique number.The TMSI is a temporary identity, which regularly gets changed. The TMSI is used for security purposes, so that the IMSI of a subscriber does not have to be transmitted over the air interface. The network, via the control channels of the air interface, sends the LAI. Temporary Mobile Subscriber Identity (TMSI).As a result of a successful registration, the network sends the mobile station two numbers that are stored in the SIM (Subscriber Identity Module) card of the mobile station. This is also known as IMSI Attach because as soon as the mobile station is switched on it informs the Visitor Location Register (VLR) that it is now back in service and is able to receive calls. Location registration takes place when a mobile station is turned on.
![Update gprs location call flow of lte](https://kumkoniak.com/118.png)