FFT Scanning Guide

 

Before Scanning， please execute execute the MML command command DSP BRDMFRINFO to query the RRU information and save it in txt. Also pay attention that some RRU do not support on line scanning. SRRU3804/3806  WRFU  RRU3808  High-resolution on-line frequency scan FFT  Broadband on-line frequency scan FFT 

X 

X 

X 

X 

RRU3805

MRFU

V1/V2 

V1/V2 

Broadband off-line frequency scan FFT 

Cell Performance Monitoring on RNC: InputCellID 



Select: RTWP Cell User Number 

  NodeB side RRU Board RTWP Monitoring Select one of the two methods, it is better selecting method one if only monitor a short period. 1） Board RTWP monitor(recommend it when collection short period RTWP) Requirement：2 hour or longer Data collect method: Workspace->Monitor->Board RTWP Workspace->Monitor->Board Input corresponding Cabinet No.-Subrack No.-Slot No. of RRU/RFU:

 

 

R15/R16 Version FFT  NodeB webLMTMonitor  Spectrum MeasureFFT Frequency Scan There are three kinds of FFT scanning, Chose the scanning method according to your needs (some RRU only support offline FFT), commonly do the FFT scanning in the spare time at least for 10 minutes: High-resolution on-line frequency scan Broadband on-line frequency scan Broadband off-line frequency scan

High-resolution: RBW (kHz)=15:

 

  Broad-online: RBW (kHz)=100 

Broad-offline: RBW (kHz)=100 If the Off-line Frequency scan, then need to first block the RRU and deactive UCELL, using MML command: BLK BRD on NodeB side and DEA UCELL on RNC side.

 

 

After the scan, UBL BRD on NodeB. Then ACT UCELL on RNC.