I have done UMTS drive testing for Cingular in Detroit. UMTS is a WCDMA technology so the parameters that we care about are Ec/Io, which should be below 10, otherwise you have pilot pollution in that area. Also we look at mobile receive, should be between -60dbm and -95dbm for a good call. For dropped calls we look at the time stamping at than add teh neighbors whose PNs were active in the area. Major problems we were having was in IRAT handovers, which is when you drive from a UMTS area into GSM area only. If neighbors are not added correctly, you might face bunch of dropped calls by the RNC boundry.