P. The Received signal code power falls below -115 dBm. System problems. Ec/10 and RSCP are at an adequate level but the call drops occur regardless of radio conditions. When analysing 3G field measurements both scanner and call trace measurements should be available. By analysing scanner data and comparing the difference between the scanner and UE performance some common problem situations can be identified. Dropped Call Analysis Dropped calls give a reliable indication of areas where users are having problems. Each dropped call should be analysed to find out what are the reasons behind each drop (an example is shown in Figure 2.95). The first step is to analyse and quantify how many drops occurred during the drive test and where and on which scrambling code they occurred. Symptoms: low Ec/10 in the UE but good Ec/10 in the scanner; call drops and the UE selects a new scrambling code not previously detected in the active set; Ec/10 improves. Problem: a missing neighbour. There has been a strong interfering signal which the scanner could pick up, but because it had not been defined as a neighbour the UE was not able to pick it up and the call drops. Radio Network Planning and Optimisation Analyzer Ble New analysis Network Image Workbook Tools window Workspace OpenLogfle UMTS Top 10 Loaded Data Files (in Map1 3brpo060204brs002b Top 1D 3bnp060204brs002b(1) Select Zoom In Zcom Out Par Layers Legend Area Select Armotations Layout Print CellStes Super Streams Stronges 2 WCDMA_Ce avn0057a SuperStream001 (Str>Wk SuperStream avn0067b1 30 UMTS Below/-20 avn0067c1 Vendor Specific **20.01 avn0109a1 Uu_RRC =1501 Plot Measurements -10.01 avn0115@J-0109ct DownLink Measurement pm 8.0to ** 6.0to Event Data - 10to 10.115cm avn0115th Dedicated Radio Link 120a1 avn0011 Above -3 Nth Best CPICH_Scan_Sorted SuperStream avn0120c1 wn0120b1 xh0011c1 CPICH_Scan_Ecto_ CPICH_Scan_Eck UMTS Active Monit avn0194c1 0194a1 avn0t SuperStreom CPICH_Scan_Ecl 0140har RSCP Pathles CPICH_Scan_Ecl Active avn01941 avn0140c CPICH_Scan_Ecl avn0002 CPICH_S