- This topic has 67 replies, 1 voice, and was last updated 14 years, 3 months ago by Pix.
20th December 2005 at 15:19 #43336TagGuest
Am working in a RF company in asia,encounter some optimization problems…
One of my sector in a site is havin high drop call,have change the freq and my ops team have when down to check the equipt,no fault was found,
After drive test no clear indications.
From my report,my uplink quality are very weak.
Syetem am using now is GSM network.
With Nokia BTS.
Any report i can run to show me more info?
Tag21st December 2005 at 09:34 #43337dannyGuest
Very simple and straight forward! If you have Network Doctor u can run Cell Doc report and u should able to spot the problem easily.21st December 2005 at 15:53 #43338TagGuest
I have run my netdoc,
so can u advice on what r e important counters to look out on…22nd December 2005 at 04:04 #43339ZarGuest
Hi Tag, if the sector in question is on hopping, you may need to disable it. Try cell doctor and see any particular TRX have sign of bad quality. Lock suspected bad TRX to see if drop call rate improve. Please Use MML command to see if any alarms on this sector. It may be external interference that result high drop call rate. All the best!22nd December 2005 at 05:10 #43340TagGuest
Thanks for the information,
We have use a spectrum and there are no externl interfence,
We have also disable hopping,
However all the 3 TRXs is having UL quality problems.
What i suspect is equipment is fault so any means to justified?
Thanks22nd December 2005 at 13:54 #43341joeGuest
what about your link balance & power control command.22nd December 2005 at 15:31 #43342TagGuest
i believe this is what u mean by the link balance.
** Rx Level Dl – Rx Level UL – Correction
However in my report it is not stated.
For power control command,what to u mean by that..i mean which one u refering to?
Thanks22nd December 2005 at 15:33 #43343MandyGuest
Anyone can explain what is the differece btw link balance and lik budget?24th December 2005 at 07:07 #43344paryGuest
what is the cell doctor ? is it specrum analaizer ? what function ?24th December 2005 at 14:11 #43345lodvicheGuest
Kindly i wonder about TRX hw problem, Cuz we encouter this in our network (alcatel) whereby we get LOW EFFICIENCY for TRXs daily, & just we replace it by other, so please what is the sensible reason beyond this problem, to avert this huge number of replacement which are (more than 4 low efficient TRXs per day)
any Ad is highly appriciated.26th December 2005 at 10:58 #43346TechManGuest
This could be due to a Path problem. Check your antenna connecttion/couplers etc and link balance.
use cell doc distance range distribution reports to check how far your cell is propogating beyond its planned coverage objective.27th December 2005 at 05:20 #43347Nitin KhuranaGuest
Just check out CDMA site collocation ….as the CDMA downlink is interferes with GSM uplink..which actually degrades the uplink quality..so I would suggest use of notch filters….To avoid the CDMS overlay problem4th January 2006 at 20:49 #43348MaxGuest
Nitin Khurana is right, also there can be overlay with DAMPS. We had this problem with EGSM TRXes,filters is the only way5th January 2006 at 16:02 #43349TagGuest
As u see for my network it only consists of GSM900 and GSM1800.
Pls advice,5th January 2006 at 22:58 #43350t28Guest
you should check antenna input, UL path from SWR point of view…
is it SBCCH cell ? if yes, is DCS layer impacted too ?
to mandy : link budget is teoretical difference between DL & UL, link balance is based on measurement done by BTS…