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SDCCH dimensioning for HR environment

Viewing 15 posts - 106 through 120 (of 155 total)
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  • 25th November 2006 at 05:19 #35568
    Ravi kant
    Guest

    thanx for the answer pix…

    16th January 2007 at 08:39 #35569
    pradeep pandit
    Guest

    how to improve paging success rate, or what are the steps if psr goes bad

    18th January 2007 at 10:59 #35570
    yogesh_rf
    Guest

    hi pix,
    I have a query regarding SDCCH Dimensioning , if you please help me in that.My Question is why there are SDCCH/8 or SDCCH/4 ,Why it cnt be SDCCH/6???

    It will be a nice help

    Rgds
    Yogesh_rf

    22nd January 2007 at 14:50 #35571
    yani
    Guest

    Hi!

    We currently have a multi-vendor network, MSC (vendor 1), two neighboring cells (vendor 2 & 3) sharing same LAC but we have high sdcch drop due to other reasons from these cells, what could be the sdcch drop due “other reasons” for this case?

    Please help, ASAP.

    Thanks.

    26th January 2007 at 08:49 #35572
    RF Learner
    Guest

    Hi Yogesh,

    There we also have S/7 or S/15 while using 1 CBCH.

    Regards
    RF

    26th January 2007 at 13:48 #35573
    Asajile
    Guest

    Hii; am new in Ericsson Network Planning, please help me on this!!is it possible to apply Cell Load Sharing Feature for the cells of different BSC?what important features/parameters in Cell level and BSC Level can causes TCH/SDCCH congestion and poor CSSR?

    16th February 2007 at 09:24 #35574
    adill
    Guest

    Hi, We’ve implemented FLP in one of the Network in our country. Everything is working properly except the SDCCH drop due to other reasons has increased.

    Do you have any solution to trace out the SDCCH drop due to other reason?

    16th February 2007 at 10:09 #35575
    pix
    Guest

    hello aadil… you’re posting the same message than imran.. :
    (cf. Imran – 3 Jul 2006, in this thread)

    are you working on the same network ? 🙂

    nevermind, here is the question : what is FLP ?

    20th February 2007 at 13:41 #35576
    Nguvu Kamando
    Guest

    Hi all,
    We are using Motorola BSS and Simens MSC, we have a problem of high drop call rate wherever we have high paging load. I have failed to relate btn the two. Please someone to elaborate!!

    21st February 2007 at 08:06 #35577
    Pix
    Guest

    hello Kuvu,

    a logical chain of events would be :

    1- high drop call %, subscribers are getting cut while calling someone or getting called.

    2- subscribers are trying to re-establish the call, all at about the same time

    3- due to simultaneous trials, there is a PCH (paging channel) high load.

    Of course, it’s just an assumption.

    Otherwise, can you find out the cause of call drop rate (bad radio, interference, coverage, during HO, due to hardware failures, due to transmissions…?), what is the average call duration ?
    what is the SDCCH drop %
    what is the RACH load, the AGCH load (and requests ?)

    is the phenomenom occuring on all cells of a BSC ?
    alls cell of a LAC ?
    just a few cells in a cluster ?
    random cell ?

    check your combined BCCH settings also..
    from NSS point of view, i’m not an expert, so i’ll just help you to clear out a possible radio issue.

    regards,
    pix

    23rd February 2007 at 03:50 #35578
    emmanuelle
    Guest

    hi,can somebody help me understand why MBCCH transfer is sometimes necessary in optimizing a cell? also, why do some MBCCH automatically transfer to another TRX in a cell? what are the parameters being monitored in such cases? thanks!

    26th February 2007 at 11:53 #35579
    Nguvu
    Guest

    Thanks Pix,

    High percentage of drops were caused by HO failures, no rf losses
    No changes on the sd losses,
    High DCR to some cells randomly to some BSCs in the same LAC
    There was increase in AGCH load but this is explainable as we increased the number of reserved access grant blocks. there was no significant change in the PCH load.

    thanks

    12th March 2007 at 20:14 #35580
    Ebe
    Guest

    My SDCCH FAILURE RATE HAVE GONE HIGH..
    this is a rural area and most of the sectors have little hand off . Can you tell me what I can do to improve

    13th March 2007 at 13:08 #35581
    Pix
    Guest

    Ebe,

    First, you have to tell us the CAUSE of the SDCCH FAILURE RATE. Normally, you should have different indicators such as :
    1. sdcch fail % due to BAD RADIO CONDITIONS
    2. sdcch fail % due to SDCCH CONGESTION
    3. sdcch fail % due to HARDWARE/SOFTWARE FAILURES

    If (1.)
    a.. check interferences (from GSM systems OR from external sources : military radars, CDMA, AMPS, TACS, other wireless technologies..)
    b .. check ghost RACH, reduce the RXLEV_ACCESS_MIN or the RACH_FILTER for instance.
    c.. check that your TRE are fine (reset the hardware)

    If (2.) : check your SDCCH traffic : location updates ? SMS ? call setups ? and then increase SDCCH capacity.

    If (3.) : verify your hardware / software.. change equipments, reset the BTS, etc…

    Regards,
    Pix

    10th April 2007 at 09:51 #35582
    ristre
    Guest

    I’ve a problem in my GSM network. we works with Siemens & Alcatel equimpents in diferent cities. We face ‘T200 Expire’ Event much especially in SDCCH assignment session. I have played with related timer in T200 Settings(increase/decrease) but no result has been concluded.
    Will you help me in this subject. I don’t know which parameters & nodes need to be checked.
    In addition, I don’t have any document in this subject(T200 guideline,Optimization,…); Will you send me if you have.
    riverstreamer@gmail.com

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