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Reply To: Dramatic LU increase


Hi m121,

If you have the resources to do so, try to perform an A interface trace to understand who is performing the LU (which IMSI’s ?).

I experienced a situation where the subscribers froma different operators (but same country) were trying to attach during the night, because their own PLMN was down for a while.

Your competitor is perhaps performing some network upgrade, which cuts the BTS’s in some areas during the night.

SDCCH MHT of 60 to 120 seconds is a little strange though. Here again, an A interface trace could help you understand the matter. Is there anyone in your MSC that could provide you with some info ?