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ND 208 analysis NSN
- 1. Company Confidential 1 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials 208 Report Analysis
- 2. Company Confidential 2 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials Case1: Jumper from TRX 4 to combiner loose (check connectors at both ends) Case2: Jumper from Duplexer to TRX 4 (check connectors at both ends) Case3: Check common feederline from Top of cabinet to Antenna port ( loose connector’s at either end or High VSWR problem, TRX 2&4 in this case use the same feeder) In this case, the Path imbalance (DL-UL) varies between +1.6 to -4dB which doesn’t tell much BUT DL pathloss variations between TRX’s is from 112.8 to 136dB & UL pathloss variations between TRX’s is from 111.2 to 140dB DEFINITELY A PROBLEM!
- 3. Company Confidential 3 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials Use OSS Data to identify & pinpoint HW faults faster Sector A 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 >70dBm 70-80dBm 80-90 90-100dBm <100dBm Downlink Signal Strength TRX3 TRX4 TRX5 TRX6 Sector B 0.00 20.00 40.00 60.00 80.00 100.00 120.00 >70dBm 70-80dBm 80-90 90-100dBm <100dBm Uplink Signal Strength TRX3 TRX4 TRX5 Path Balance Reports help understand any imbalance between UL and DL Whereas Eg.Pathloss comparisons between TRX’s of same sector can help identify loose cables or hardware faults, taking other TRX’s as reference case Eg. In Sector A:TRX 3 &4 have only 20% of DL SS samples <- 100dBm whereas TRX 5 & 6 have 70% of their DL SS samples <-100dBm. Prob:1 Combiner Faulty In Sector B TRX 5 clearly had a difference in signal strength only in Uplink. Prob: Rx cable found to be loose The same faults can also be seen using Rxlevel statistics from OSS shown in this slide, but 208 is faster for analysis!
- 4. Company Confidential 4 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials How to identify the worst cells in your network? • Import DL & UL pathlosses for all TRX’s of all cells into separate columns • Use a pivot table to get Min and Max values of dL and Ul pathlosses in a cell • Identify all cells with DL TRX pathloss variatons >10dB(for a NW with huge TI quality issues , sstart with 15dB) • The same can be done for UL also • A combined analyses for DL& UL with >10dB diff gave a list of 58 cells for UP(West) attached below. • Go back to 208 report for detailed analysis