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UL quality

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Viewing 15 posts - 1 through 15 (of 68 total)
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  • #43336 Reply
    Tag
    Guest

    Hi,

    Am working in a RF company in asia,encounter some optimization problems…

    Pls advice

    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.
    GSM900
    With Nokia BTS.

    Any report i can run to show me more info?

    Pls advice.

    Rds
    Tag

    #43337 Reply
    danny
    Guest

    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.

    #43338 Reply
    Tag
    Guest

    Hi danny,

    I have run my netdoc,

    so can u advice on what r e important counters to look out on…

    #43339 Reply
    Zar
    Guest

    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!

    #43340 Reply
    Tag
    Guest

    Hi Zar,

    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?

    Thanks

    #43341 Reply
    joe
    Guest

    what about your link balance & power control command.

    #43342 Reply
    Tag
    Guest

    Hi joe,

    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?

    Pls advice

    Thanks

    #43343 Reply
    Mandy
    Guest

    Hi guys..

    Anyone can explain what is the differece btw link balance and lik budget?

    #43344 Reply
    pary
    Guest

    hi guys
    what is the cell doctor ? is it specrum analaizer ? what function ?

    #43345 Reply
    lodviche
    Guest

    Hi guys:
    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.

    #43346 Reply
    TechMan
    Guest

    Tag,

    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.

    #43347 Reply
    Nitin Khurana
    Guest

    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 problem

    #43348 Reply
    Max
    Guest

    Nitin Khurana is right, also there can be overlay with DAMPS. We had this problem with EGSM TRXes,filters is the only way

    #43349 Reply
    Tag
    Guest

    Thanks guys,

    As u see for my network it only consists of GSM900 and GSM1800.

    Pls advice,

    #43350 Reply
    t28
    Guest

    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…

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