Suggestions on how to improve drop call rate for a cell serving a railway track for Ericsson

Hi team…any suggestions on how to improve drop call rate of a cell serving a railway track in Ericsson.
Major drop we found was due to ulsignal strength

Check for TRX timesolt quality

Do you mean…ulsignal strength drop due to quality?

yes, I meant the UL signal strength drop due to quality

OK. Where do I check for time slot wise quality?