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2G to 3G HO

Viewing 15 posts - 31 through 45 (of 57 total)
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  • 25th January 2011 at 12:13 #61919
    Optim
    Guest

    Hi Xperts and Pix,

    I need to know about some Penalty time that we want to apply on certain Connections when they come from 3G to 2G . . . so that they don’t go back to 3G instantly.

    Tc

    Optim

    26th January 2011 at 21:56 #61920
    Ayat
    Guest

    hello

    can any body tell me how i can know does my handset support DTM mode or Class A??

    9th February 2011 at 15:08 #61921
    alcatel man
    Guest

    Hello Pix, I recently modified an existing single cell to concentric cell and traffic reduced, Level HO rate increased…Pls who can explain the reason.
    Also, what is this parameter “neighbour Rxlev(o,n)” used for and how is it tuned for concentric cells?

    11th February 2011 at 08:56 #61922
    pix
    Guest

    alcatelman,

    have a look to this thread.

    http://www.erlang.com/forum/erlang/thread.htx?thread=4433

    Are you using monoband cc cell, or multiband cc cell ? (cc = concentric)

    if monoband, then use

    ZONE HO HYST DL = 6dBm
    ZONE HO HYST UL = 3dBm
    MS_TXPOWER_MAX_INNER = 33dBm – the trx attenuation in the inner zone (ie. if attenuation = 10dB, then mstxpowermaxinner = 23dBm)

    The parameter neighbour Rxlev(o,n) is very very very useless, keep it at a default -47dBm for all neighbours. I don’t think it is worth explaining it in details…

    If you increase it towards a certain neighbour, you’re going to reduce the number of HO from inner zone to that neighbour.

    Please share your current settings.
    Cheers
    pix

    16th February 2011 at 09:54 #61923
    alcatel man
    Guest

    Hello Pix,
    Cell is located in dense urban area with good network coverage. Pls see my current settings below and advise,

    BS_TXPWR_MAX= -30dB

    BS_TXPWR_MAX_INNER= -30dB

    MS_TXPWR_MAX= -30dBm

    MS_TXPWR_MAX_INNER= -30dBm

    RxLev_UL_Zone = -95dBm

    RxLev_DL_Zone = -92dBm

    En_Load_Outer = Enable

    En_Load_Balance = Disable

    En-BetterZone_HO = Enable

    T_HCP = 10

    Ping Pong HCP = 15secs

    Cell Type = Concentric.

    16th February 2011 at 14:04 #61924
    pix
    Guest

    hi,

    it is a monoband 1800 concentric cell ?

    what is the value of :
    ZONE HO HYST DL
    and
    ZONE HO HYST UL
    ?

    now some analysis :

    BS_TXPWR_MAX= -30dB
    and
    BS_TXPWR_MAX_INNER= -30dB
    is CRAZY !!!!
    Are you really putting an attenuation of 30dB to your BTS ? Then there is almost no coverage at all.
    This value should be 0dB.

    Then….
    MS_TXPWR_MAX= -30dBm
    MS_TXPWR_MAX_INNER= -30dBm
    that should be a positive value, such as +30dBm (in 1800MHz cell) or 33dBm (in 900Mhz cell)

    Waiting for your answers to the first questions…
    cheers
    pix

    16th February 2011 at 14:56 #61925
    alcatelman
    Guest

    Hello Pix,
    Sorry you I passed the wrong info:

    BS_TXPWR_MAX= 0(full transmit, no att.)

    BS_TXPWR_MAX_INNER= 09full transmit, no att.)

    MS_TXPWR_MAX= 30dBm..full transmit

    MS_TXPWR_MAX_INNER= 30dBm..full transmmit

    Zone_HO_HYST_DL/UL = 6dBm

    2Tres in outer zone, four TRXs in inner zone with additional ANy Combiner attenuation of 3dB.

    16th February 2011 at 15:38 #61926
    pix
    Guest

    ok now you are making sense… you’re not an easy person to help ! 😀

    what is
    L_RXLEV_DL_H ?
    L_RXLEV_UL_H ?

    L_RXLEV_DL_P ?
    L_RXLEV_UL_P ?

    A_LEV_HO ?
    A_LEV_PC ?

    rgds
    pix

    16th February 2011 at 15:41 #61927
    pix
    Guest

    also, some QoS stats I need:

    what is the TCH Erlang (FR+HR) in EACH TRX ?

    What is the amount of TCH allocation per TRX ?

    What is the amount of HO cause 13 (outer to inner zone) ?

    16th February 2011 at 15:56 #61928
    alcatel man
    Guest

    Hello pix, Pls see settings,

    L_RXLEV_DL_H …. -81dbm
    L_RXLEV_UL_H ? …. -100dBm

    L_RXLEV_DL_P ?…..-75dBm
    L_RXLEV_UL_P ?….. -85dBm

    A_LEV_HO …. 8
    A_LEV_PC … 4

    16th February 2011 at 16:34 #61929
    Pix
    Guest

    L_RXLEV_DL_H …. -81dbm

    Why ??????????

    It should be -93dBm by default.

    No wonder you have lots of level HO.

    Please check if this setting is really necessary or not.

    16th February 2011 at 17:22 #61930
    alcatel man
    Guest

    mistake, i meant to say -91dbm

    17th February 2011 at 10:37 #61931
    nux
    Guest

    Hi all,

    i’m working at ericsson core network. i have similar problem about 3G-2G HO. what parameter that could be affect this issue at core side?

    i have created route for BSC/RNC, LAC/CI before. any advice would be great for me

    thanks

    17th February 2011 at 12:50 #61932
    pix
    Guest

    alcatel man,

    will you always do one mistake per post ? if you do so many mistakes when you write, how many do you do when you read ? i’m scared…

    try the following settings:
    RxLev_UL_Zone = -95dBm
    RxLev_DL_Zone = -86dBm
    Zone_HO_HYST_DL = 6dBm
    Zone_HO_HYST_UL = 3dBm

    please tell me your QOS stats, the ones I asked few posts ago (traffic, etc…)

    Regards
    pix

    21st February 2011 at 06:20 #61933
    Sachin Huilgol
    Guest

    for testing 2g to 3g handover what are the parameters we need to validate for device/handset testing in qxdm

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