How does location update take place in GSM?

How does location update take place in GSM?

The mobile starts a Location Update process by accessing the MSC/VLR that sent the location data. the MSC/VLR that has served the mobile phone up to this point. 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.

What is location area in GSM?

Location Area (LA) A GSM network is divided into cells. A group of cells is considered a location area. A mobile phone in motion keeps the network informed about changes in the location area.

How the location of mobile user is tracked using various registers in GSM?

Each GSM MS user is given a HLR that in turn comprises of the user’s location and subscribed services. VLR is a separate register that is used to track the location of a user. When the users move out of the HLR covered area, the VLR is notified by the MS to find the location of the user.

What are the parameters involved in GSM authentication?

The GSM authentication protocol consists of a challenge-response mechanism. In the entire authentication process, the three main actors are the MS, MSC/VLR and HLR/AuC as given in Figure 2. The mobile station sends its Temporary Mobile Subscriber Identity (TMSI) to VLR in its request for authentication.

What is GSM registration?

In a GSM network, when a Mobile Station (MS) is switched ON, the International Mobile Subscriber Identity (IMSI) attach procedure is executed. This procedure is required for the Mobile Switching Center (MSC) and Visitor Location Register (VLR) to register the MS in the network.

Whats does GSM mean?

grams per square metre
Do you have any idea what it really means? GSM stands for “grams per square metre”.

What are the different types of GSM call?

Voice all calls

• All Outgoing.
• Incoming calls.
• Voice charges.
• Speech encoding.
• Circuit-switched data protocols.
• General Packet Radio Service (GPRS)
• Short Message Service (SMS)

How is GSM authentication done?

Authentication in the GSM system is achieved by the Base Station sending out a challenge to the mobile station. The MS uses a key stored on its SIM to send back a response that is then verified. This only authenticates the MS, not the user. To request for a call or to receive a call, the MS has to get authenticated.

What is roaming in GSM?

Roaming enables a mobile subscriber to automatically make and receive voice calls, send and receive data, or access other services when travelling outside the geographical coverage area of their home network, by means of using a visited network.

What is a triplet in GSM?

The Kc is the ciphering key that is used in the A5 encryption algorithm to encipher and decipher the data that is being transmitted on the Um interface. The RAND, SRES, and Kc are collectively known as the Triplets.

How does location update procedure work in GSM?

In order to make a mobile terminated call, The GSM network should know the location of the MS (Mobile Station), despite of its movement. For this purpose the MS periodically reports its location to the network using the Location Update procedure. A GSM network is divided into cells. A group of cells is considered a location area.

How does the network register work on a mobile phone?

These registers are used to store the last known location of the mobile. Thus at registration the register is updated and then periodically the mobile updates its position. Even when the mobile is in what is termed its idle mode it will periodically communicate with the network to update its position and status.

What are the different types of Location Register?

There are two types of location register: home location register (HLR) and visitor location register (VLR). An HLR is a database for mobile subscriber management. Stored therein are the subscription information and some location information enabling charging and routing.

How does the GSM transmit network specific information?

The GSM air-interface, designated Um, transmits network-specific information on specific broadcast channels. This information includes whether the periodic location update is enabled. If enabled, then the MS must send location update requests at time intervals specified by the network.