Generic selectors
Exact matches only
Search in title
Search in content

RxlevAccMin

Viewing 15 posts - 1 through 15 (of 20 total)
  • Author
    Posts
  • #54919 Reply
    MKT
    Guest

    Hi all..

    I want to know RxlevelAccessMin has got significance in case of IDLE only or
    in DEDICATED also?

    Our network…..after upgradation to MULTIBAND…1800/900 is showing a BAS taste for customers.

    What i observed that…
    Rxlevel and Rxqual are fine as long as TCH is on 900.

    But on 1800 the Rxlevel goes down to -80dBm to -97 dBm on and off.

    Also sometimes the situation is so worst that it reaches -106dBm or sometimes even -109dBm.
    At this stage the Rxqual is normally 7….AND
    CALL DROPS.

    It is not with any individaul site……it is common with all sites…….

    Can we fix it.

    Regards

    MKT

    #54920 Reply
    Pix
    Guest

    I would say that you have to define an exit strategy when the MS is in a DCS1800 cell. You have to check if a handover is possible towards another GSM900, because usually it is quite complex…

    #54921 Reply
    Bhanu
    Guest

    Rxlevel Accmin has got significance in idle mode only.
    You can ceck your MAIO plan for 1800 and also as pix mentioned,parameters for call handover to 1800 TCH.

    #54922 Reply
    Sam
    Guest

    Hi MKT,

    I understand ur problem, call drop happens when u r going away from 1800 band, but call is not handed over to 900 band; there may be two cases:
    1. both band have individual BCCH
    2. common BCCH for both band.

    these HO causes are due to radio reasons, so if it is the case, then check hoMarginLev and hoMarginQual, u may have to adjust these parameters to initiate HO.
    u have to check hoLevelUmbrella also for HO reasons.

    hope this information helps you..

    -Sam

    #54923 Reply
    Pix
    Guest

    Sam,

    Your advice works only for one brand of equipments, but perhaps MKT is not using the same as you.

    #54924 Reply
    mkt
    Guest

    not able to post

    #54925 Reply
    mkt
    Guest

    Thanks for replies…….

    Let me provide more inputs….

    The BCCH is on 900
    1800 has been used just to add capacity to the cell.

    #54926 Reply
    mkt
    Guest

    Earlier cell was with four TRX of 900.
    Now it is 4+2=6 TRX per cell. The additional two are from 1800

    #54927 Reply
    mkt
    Guest

    One more thing…
    Our vendor has used 29 frequencies from the DCS1800 band for these TWO TRX of 1800.

    Is there any thing wrong in using a LONG LIST in the MAL for 1800?
    Any thing like RADIO LOAD???

    #54928 Reply
    mkt
    Guest

    ALSO

    If power control is ON in a cell…As you don’t have to option to see uplink but certainly you have the one for downlink.

    So…
    Does the RxLevel of a TCH drops/reduces by virtue of PC?

    #54929 Reply
    mkt
    Guest

    What I observed in the drive test is that…….

    Before call drop either the

    Rxlevel was in the range -100 to
    -109dBm

    OR
    The RXqual was at 6 or 7.

    I think these values should be sufficient enough for the Algorithms in the BSC to get triggered and handover the CALL to a SUITABLE cell—–which may be INTRA or INTER???
    But that’s not happening.

    So should I focus the energy on solving of Rxlevel and Rxqual…so that the need for handover doesn’t arise at all…

    OR

    Should i accept the Rxlevel and Rxqual as it is and focus the energy on making the handovers as early and smooth…….?

    Regards
    MKT

    #54930 Reply
    optimiser
    Guest

    You’ve got bad quality and level at the same time. That means you have a coverage problem. You should focus on exiting the 1800 to the 900, which will normally have better radio conditions.

    What are your values for the different Handover margins and priority, as well as CRO?
    Since you have fewer TRX on the 1800 cell, you should limit its coverage area, by increasing the rxlevaccess min of 1800 cells.

    #54931 Reply
    pix
    Guest

    as far as i understand, the 1800 is not a cell : it’s the inner zone of a dualband cell. So you can’t set the CRO nor the RXLEV ACCESS MIN on the TRX1800 only.

    MKT, can you tell me which vendor you’re using ? alcatel, if i remember well?
    what are the values of
    RXLEV DL ZONE
    RXLEV UL ZONE
    ZONE HO HYST DL
    ZONE HO HYST UL
    BS TXPWR MAX INNER
    BS TXPWR MAX
    L_RXLEV_DL_H and …_P
    L_RXLEV_UL_H and …_P
    U_RXLEV_DL_P
    U_RXLEV_UL_P

    Thanks,
    Pix

    #54932 Reply
    MKT
    Guest

    Hi

    The network is Ericsson…

    Pix, you are right, that
    1800 is used only for traffic.

    Just tell me…….

    if i put 29 ARFCN in the MAL for two TRX……

    then, is there any DRAWBACK.

    #54933 Reply
    Pix
    Guest

    2 / 29 = 7%, it’s very clean. (usual limit is 10% or 12%)

    drawback for what ?

    your have a parameter problem. Please contact your optimizer so he works on finding better settings.

Viewing 15 posts - 1 through 15 (of 20 total)
Reply To: RxlevAccMin
Your information:




<a href="" title="" rel="" target=""> <blockquote cite=""> <code> <pre class=""> <em> <strong> <del datetime="" cite=""> <ins datetime="" cite=""> <ul> <ol start=""> <li> <img src="" border="" alt="" height="" width="">