Hi,Guys,We are facing a problem of congestion of more than 1% on all our sites,it is ranging from 1% to 60%,there are more 10,000 Location updates request in every cell every day.we are a new operator & we have only 100 customers.we found that location updates are from other operators,we are not able to find out the reason why other operators customers are trying to latch on our network,we are using ZTE equipment,bts ZGR8018,8112 & BSC-iBSC10.can any body help.
In real environnment SDCCH congestion will depend on load of the cell ( cell high or low loaded ) and the type of the cell : LAC border, internal etc..
Take a look at this example:
Imagine you define 1 TS SDCCH on cell that got 1 TRX:
Theoriticaly this cell can handle 2.74 Erl of traffic SDCCH at GOS 0.5 but this load is for One Hour period. Imagine at one time, a bus containing 40 people cross this area (Supposition is done that this cell is a lac border) , that is only 8 MS will do LA updating , the others 32 MS will wait and send again request one time again; this could lead to congestion if this cell is not loaded enough on busy hour to hidden the local time congestion.