GSM Location Update
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16-02-2011, 12:29 PM

presented by:
Q. Ali Bakhtiar

.ppt   GSM Location Update.ppt (Size: 517 KB / Downloads: 247)
GSM Location Update

• 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.
• Home Location Register (HLR):The HLR maintains a database for the mobile subscribers. At any point of time, the HLR knows the address of the MSC VLR that control the current location area of the mobile. The HLR is informed about a location area update only if the location area change has resulted in a change of the MSC VLR.
• Mobile Switching Center - Visitor Location Register (MSC-VLR): The MSC VLR is responsible for switching voice calls and it also keeps track of the exact location area where the mobile user is present
Signal Strength Monitoring
• When idle, the GSM mobile phone keeps monitoring the beacon frequency for its current cell.
• The GSM mobile measures the cell strength to see if it should change its primary cell. The signal strength of the Broadcast Control Channel (BCCH) will be monitored to select the best cell.
• The BCCH of the neighboring cells is monitored to determine if any of the neighbors have a better signal strength
Signal Comparison
• Whenever the primary cell changes, the mobile checks if the Location area of the old cell and the new cell are different.
• If the old and new location areas are different. The mobile initiates the Location Area Update procedure.
Location Update Procedure
• The mobile (request-response) establishes a RR connection to send the location update to the network.
• A radio channel has been assigned to the GSM mobile.
• The mobile tunes to the assigned radio channel and sends the SABM (Set Asynchronous Balanced Mode = frame/packet) to initiate the radio connection.
• The location update is also piggybacked on the message.
Location Update Procedure
• The BSC receives the location update with the SABM.
• The location updating request is forwarded to the MSC.
• The RR connection setup is completed by responding with UA for the received SABM.
Location Update Procedure
• The new MSC-VLR finds that the old location area was handled by a different MSC-VLR.
• Thus the new MSC needs to contact the HLR.
• The HLR provides the information of old MSC-VLR.
• The new MSC-VLR contacts the old MSC-VLR to get the IMSI of the subscriber and register in its records
Location Update Procedure
• The new MSC-VLR sends an update location message to the HLR.
• HLR passes the security information of the subscriber to the new MSC-VLR
Thinking To Register

20-07-2012, 11:55 AM

How do the MSC derive the HLR GT from the IMSI GT Translation?

As for instance, if the IMSI GT Translation is 40477------- 5-919436, what will be the HLR GT?
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Posts: 5
Joined: Jan 2012
23-10-2012, 03:17 PM

Good post,I will come back later.You can know that there are people who change the look of their cell phone through these cheap cell phone accessories in order to make them go with their outfit for the day or the type of situation that they are going to be in, such as business or pleasure.
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24-10-2012, 11:43 AM

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