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vlr , visitor location register contains the database of roamng subscribers. Everytime there is a location update the data of the roaming subscriber from the old VLR is transerred to the new VLR corresponding to the new locationwhere the user moved in.
IN WIRE LESS COMMUNICATION USER MAY BE ANYWHERE IN WORLD.SO N/W SHOULD KNOW WHERE IS IT...SO N/W CONTINUOSLY LOCATE HIM....
BY USING HLR(HOST LOCATION REGISTER) IT HAS ALL INFORMATION LIKE IMSI(INTERNATIONAL MOBILE SUBSCRIBER IDENTIFICATION) ITS LOCATE USER WHN USER AT HOME LOCATION SAY NOT IN ROAMING..
WHN USER IN ROAMING ALL INFORMATION STORE IN VLR IT ALSO GENERATE TEMSI(TEMPRORY MOBILE SUBSCRIBER IDENTIFIACTION) ITS TEMPRORY BECAUSE IT ASSUME THAT USER IS ONLY TEMRORY IN ROAMING NEVER PERMANENT...
VLR ALSO CHECK USER & CHECK AUTHENTICATION WITH HGELP OF HLR.....
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