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How Location Update in Telecommunication Network Works

Posted on January 14, 2010 |

Hi all! Today we will talk about location update in wireless telecommunication technology. One BTS can only cover 12 km, for example in CDMA2000 1x EV-DO, how if one moving more than 12 km and get the wireless signal from another BTS. May be you want to know what happening in your phone and in telecommunication carrier. In this post I will share how location update going and what is happen with your SIM card and Telecommunication carrier.

  How Location Update in Telecommunication Network Works

 

Let’s take a look at the mobile phone campaign under a Base Station(BTS). The SIM card of the mobile is a small database which contains data about the network. The SIM card contain: Temporary Mobile Subscriber Identity(TMSI) and Location Area(LA) data, which indicates the current roaming location of the mobile.

The MS is always tuned to one BTS at a time. It pics the Cell Global Identity(CGI) of the tuned Base Station from the data which the Base Station is broadcasting. Here we will see the flow of location update, what is exactly happen.

  1. In this example the MS is on the LA-1 and have the TMSI:1, so the SIM card stored LAI:1 and TMSI:1
  2. Lets move the mobile in the network. If it goes under another Base Station, there is no need to perform a Location Update if the Base Station belongs the same Location Area(BTS whit grey color has the same Location Area)
  3. If the new BTS belongs to another Location Area, the LAI listened from the new Base Station will be different from the LAI stored in the SIM Card.  In this case the MS move to LA-2.
  4. The mobile starts then the Location Update procedure by sending an update message to the VLR. This Message include the old and new LAI together with the TMSI
  5. With the help of this information the VLR find the subscriber data
  6. The new LAI (LA-2) is updated to the VLR database.
  7. The new TMSI is generated and updated to the VLR database. We will name it TMSI-2.
  8. The location update is acknowledged and the new TMSI is sent to the mobile
  9. The mobile stores the new TMSI(TMSI:2) and LAI(LAI:2) to the SIM

That’s all the flow, may this share add your knowledge in telecommunication technology. Thanks for reading.

Category : Telecommunication Concept

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