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handover

  • This topic has 28 replies, 1 voice, and was last updated 15 years ago by RF.
Viewing 15 posts - 1 through 15 (of 29 total)
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  • 27th October 2009 at 16:58 #59317
    alex
    Guest

    can enybody clarify me about handover between two MSC?
    WHAT IS EXACTLY THIS PROCESS HAPPEND?
    WHICH DEFINITION IN DATABASE FOR THIS TYPE OF HANDOVER MUST BE APPLIED?

    27th October 2009 at 21:21 #59318
    pix
    Guest

    a mobile is moving… a ho happens… but :
    the target cell is located in a different MSC than the serving cell.
    the serving MSC and target MSC must exchange HO signalling so that the target cell is ready to welcome the incoming MS.

    Definition in database ? I don’t understand.

    Cheers
    pix

    28th October 2009 at 18:54 #59319
    Silvanus
    Guest

    SDCCH congestion

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    hi,
    i have cells with which perform good HO in only one direction and high failure the opposite direction (Alcatel) which parameter can i change to improve HO in both directions?

    29th October 2009 at 11:02 #59320
    Pix
    Guest

    What is the cause of failure ? Radio ? Congestion ?
    Check the HO outgoing indicators from the serving cell AND the HO incoming indicators form the target cells. It will give you a clear picture of what is really happening.

    (indicators = requests, allocated, success, congestion, radio fail, bss fail, return to old channel, etc)

    Cheers,
    pix

    31st October 2009 at 11:22 #59321
    Silex
    Guest

    What is the solution to balance the traffic between Underlaid and overlaid in ericsson BTS 2G, the 1800Mhz is free but 900 is congested.

    3rd November 2009 at 06:14 #59322
    Bijoy
    Guest

    What are the values of SCLDUL & SCLDOL you are using?
    Also what are the values of DTCB,LOLHYST,TAOLHYST & DTCBHYST?

    3rd November 2009 at 08:50 #59323
    Eric
    Guest

    Can you please some one help me with handover problem between 900 and it DCS in some special hour outgoing handover for 900 goes down and after that it comes to normal vendor is alcatel.
    and majority of hoandover is due to UL level and Quality .

    3rd November 2009 at 11:06 #59324
    silex
    Guest

    Hi Bijoy,
    SCLDUL=SCLDOL=20, DTCBP= no value, LOLHYST=3, TAOLHYST=0, DTCBHYST=2.
    Thanks for your helping.
    Silex.

    3rd November 2009 at 13:40 #59325
    KRISH
    Guest

    hI BIJOY,

    I AM ALSO USING ERIC SYS.AND WE HAVE DUAL BAND IN EACH CELL

    CAN U HELP ME TO UNDERSTAND THE LOL,TAOL,DTCB AND LOLHYST,DTCBHYS,TAOLHYS.

    HERE WE HAVE BY DEFAULT VALUES .BUT IF WE CHANGE LOL FROM 130 TO 100 THEN TRAFFIC WILL MOVE TO 900 CAN U PLZ SHARE ABOVE ALL VALUES AND ITS EXPLANATION PLZ………..

    3rd November 2009 at 15:49 #59326
    Pix
    Guest

    Eric,

    Is “preferred Band Ho” = Enable ?
    Are both GSM and DCS cells in the same layer (Umbrella ? Mini ? Micro ?), or different layers ?
    What is the setting for
    MULTIBAND TRAFFIC CONDITION = ??? in the GSM cell
    HIGH TRAFFIC LOAD = ??? in the DCS cell

    Best Regards,
    pix

    4th November 2009 at 04:43 #59327
    Bijoy
    Guest

    Silex.
    You can change SCLDUL to 50 & check.You can also increase LOL .You can also change FBCHALLOC=2 & observe.(I hope you are using +ve FBOFFS).
    Krish
    First you read Alex,then we can discuss.Increasing LOL is not a good idea at all,rather increase SCLDUL or SCLDOL.

    4th November 2009 at 10:07 #59328
    krish
    Guest

    Hi bijoy,

    i already went thr alex so if u like to explain then it wil help me plz and can u also explain by putting fbchalloc 0,1,2 what happens? here i have dual bang 900,1800 in alll cells…

    4th November 2009 at 13:41 #59329
    Eric
    Guest

    The “preferred Band Ho” = is enabled Enabled and
    both GSM and DCS cells in the same layer with
    MULTIBAND TRAFFIC CONDITION = anyload and
    HIGH TRAFFIC LOAD = 70 in the DCS cell.
    BR

    4th November 2009 at 23:46 #59330
    Pix
    Guest

    Eric,

    Could you please try to increase the HIGH TRAFFIC LOAD in DCS up to 80%, then 90% then 95% to check the impact ?

    The Traffic_load of the cell (DCS) is compared to the HIGH TRAFFIC LOAD threshold. If it is above, then the incoming “Preferred Band HO” is stopped. 70% is rather low.

    By choosing a higher value, you will force the Pref Band Ho even if the DCS cell is already “quite” loaded.

    Ensure that the A TRAFFIC LOAD and N TRAFFIC LOAD are set at standard values (not too small values, otherwise, the averaging is done too quickly… having a high threshold and quick average doesn’t sound too hot to my ears, initially… You could give it a try later though, as fine tuning optimization)

    5th November 2009 at 05:08 #59331
    Bijoy
    Guest

    Hi Krish
    FBCHALLOC defines how to prioritise different frequency bands/subbands within a subcell at CS channel allocation. I.e. if there shall be no preference (=0), if channels in the BCCH frequency band/subband shall be selected first (=1), or if channels in the BCCH frequency band/subband shall be selected last (=2).

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