It's just my notes.

Maybe it's not important to you, but it's mine!

Optimization in Nokia System

I got good tutorial from http://www.cellular-planningoptimization.com and I wanna share with you. Its just copy from that good website of RF.

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HOSR Analysis-Tips on Nokia system-1
Possibilities :

  • Co or Adjacent BCCH
  • High TCH Blocking on target cell
  • Wrong TSC setting regarding BSIC allocation
  • Bad Neighbor Relation
  • HW faulty or Unbalance TRX power among a sector
  • Others ( Inter BSC-Inter MSC)

Preparation Data  :

  • BCCH, BSIC planning, ND report 072
  • Cell Stat or TQM of HO distribution and ND report 153
  • Alarm (ZEOH & ZEOL) and site visit
  • Timing Advance 232
  • Adjacent Consistency Check ND060, 62 or 69
  • ND Report 73 to check Undefined Neighbor

=================================

HOSR Analysis-Tips on Nokia system-2

Problem Analysis :

  • Check possibility Co. or Adj. Interference then change  BCCH frequency.
  • Check neighbor traffic & TCH blocking, check possibility for traffic sharing or directed retry.
  • TSC value should be same with BCC, check performance HO out and incoming.
  • Parameter setting ADJE to make delay on worst target cell or faster HO on best target, focused on High HO Fail. Relate parameter FMT or AUCL.
  • Check TRX alarm (mostly 7745 together with 7743 or 7746). Check TRX configuration.
  • Optimize coverage from TA distribution or update missing Neighbor from ND 73.
  • Check the highest handover cause: by interference, quality, level, power budget, GPRS, etc. Check for the highest HO failure: by Blocked, Conn. Fail., Return to Old, End of HO,etc. The highest value is possible as the highest contribution of HO fail

==========================
SDCCH Success Rate Analysis-Nokia System-1
Possible :

  • Interference on BCCH frequency
  • SDCCH Blocking
  • SD Drop on Location Update
  • A_If, TRC or LAPD Fail
  • HW faulty
  • Excessive TA

Data Collection :

  • ND Report 72 to check BCCH clearance
  • Alarm Log
  • TA distribution ND Report 232
  • Quality and Link Balance ND Report 195 and 196.
  • Interference UL and ND 196

===============================

SDCCH Success Rate Analysis-Nokia System-2

Problem Analysis :

  • Check possibility Co. or Adj. Interference and clear the BCCH frequency.
  • Check SDCCH utilization and add SDCCH if needed.
  • Change TRP or change SDCCH allocation on TRX with good quality based on ND 196.
  • Check TRX alarm (mostly 7745 together with7743 or 7746). Check TRX configuration.
  • Check TA distribution, coverage distribution and propose physical tune.
  • Optimizing parameter C2 also if Location update is the highest contributor of SD Drop.
  • Highest contributor: Fail on RADIO, ABIS, A_IF, TR or LAPD.
  • Check TRX alarm (mostly 7745 alone or together with 7743)
  • Check RX Lev Access Min and Max Number of Retransmission. Check RACH Rejected and SDCCH request (fails or ghost).

================================

KPI Analysis on Nokia system-TCH drop-1

Possibilities :

  • Interference on BCCH TRX
  • Interference on hopping TRX(DL Interference)
  • External Interference (UL interference)
  • Bad Neighbor Relation (bad HO)
  • Low Coverage
  • HW Faulty or TRX Power Unbalance
  • Other : A_If, TR or LAPD Fail

Preparation Data :

  • BCCH Planning, ND report 072 (DL Interference distribution)
  • ND Report 216, 196 and Alarm (Interference)
  • ND Report 204, 153, 195 ( HO fail and Path Balance)
  • ND Report 232 ( Coverage cell)
  • ND Report 163 or TQM drop per causes

===================================

KPI Analysis on Nokia system-TCH drop-2
Problem Analysis:

  • Check possibility Co. or Adj. Interference. Check clean BCCH frequency.
  • Check DL quality Distribution and Check MAL and MAIO
  • Check UL quality Distribution, check UL interference Pwr Contrl setting to compensate interference.
  • Check % of HO fail from adjacencies, focused on High HO Fail. Check TCH_RF_HO_OLD. Check possibility to add some neighbor. Try to prevent un proper  HO  and use FMT to reduce drop.
  • Check best serving cell, possibility HO to best serving cell (Macro or Indoor) make it faster to prevent drop.
  • Check TRX alarm (mostly 7745 together with 7743 or 7746). Check TRX configuration or reset TRX if needed.
  • Check TA distribution, coverage spillage and proposed physical tune.
  • Check and compare which one the highest: Fail on RADIO, ABIS, A_IF, TR or LAPD.

Hope it’ll be helpfull.

Thanks to http://www.cellular-planningoptimization.com

2 responses to “Optimization in Nokia System

  1. Harry September 8, 2010 at 6:29 am

    You can visit this site for more useful material
    http://www.telecomfunda.com/forum

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