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No paging response.

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  • #60179 Reply
    Lexa
    Guest

    Hello everybody!

    There are a lot of complains from our subscribers regarding the quality of network. For example, the indicator of GSM coverage is full, but nobody can’t call to this subscriber.

    It is possible to find paging message in protocol analyzer, but there is no response on it.

    The situation looks like subscribe is detached, but MS is on.

    Any suggestions?

    #60180 Reply
    Zandu
    Guest

    Plese switch off and switch on the MS and then check.
    1>replace the SIM

    #60181 Reply
    Pix
    Guest

    hi Lexa,

    if the paging message is going through, then it means the MS is attached… So it probably isn’t attached, and we must assume you have seen the paging request while dreaming ๐Ÿ™‚

    Is there a cell parameter to autorize “IMSI attach” in the cells ? In Alcatel, it is called “ATTACH”.

    Does it happen to only one MS, or to many MS ?
    If this MS (MS 1) calls someone, does it work ? if few minutes later you try to call that MS (MS 1), can you go through ?

    -pix

    #60182 Reply
    Lexa
    Guest

    Hello Pix,

    thanks for your interest in my problem. The situation happens to many MS and I think it take place in whole our network.

    “If this MS (MS 1) calls someone, does it work ? if few minutes later you try to call that MS (MS 1), can you go through ?”
    If MS1 calls to someone than the call is successful. And if someone calls to MS1 the call is successful.

    The vendor of our equipment is Ericsson.

    #60183 Reply
    Lexa
    Guest

    Pix,

    regarding your question of “IMSI attach”. Here is the description of this parameter for Ericsson equipment “Attach and detach allowed”.
    If this parameter is “NO” then “MSs in the cell are not allowed to apply International Mobile Subscriber Identity (IMSI) attach and detach.”
    If “YES” – “MSs in the cell must apply IMSI attach and detach.”

    In my previous post I’ve made mistake. Instead “And if someone calls to MS1 the call is successful.” you should read “And if someone calls to MS1 several minutes later then the call is successful.”

    #60184 Reply
    Pix
    Guest

    Lena,

    You perfectly answered my questions ๐Ÿ™‚
    So let me rephrase :
    1/ the MS1 canot be reached, unless it made a call before.
    –> this is typical from MS that is not attached.

    2/ there is a attach/detach parameter in ericsson
    … is it set to YES or to NO ???

    If it is yes, then the problem comes from the MSC/VLR : the IMSI detach timer is too early ! it is a specific timer from VLR, I’m not talking about the parameter you described, which is in the BSS.
    Check that the VLR parameter is >> than the T3212.
    What is the value of T3212 in your cells ?

    Cheers
    pix

    #60185 Reply
    Lexa
    Guest

    Hi folks,

    I think that we defined the problem. First of all, the T3212 has two meanings in our network: 4 hours for urban area and 6 hours for rural area. Several weeks ago T3212 was equal for both areas – 4 hours.

    There are two parameters on MSC which have relation to LU:
    “BTDM=btdm Base time duration in minutes. The base time must be as long as the longest periodic location
    updating time in the interworking BSC’s.”
    “GTDM=gtdm Guard time duration in minutes. The guard time is used to prevent unnecessary marking of MS
    implicit detached, for example if the system clocks are not
    synchronized in the MS and in the MSC/VLR.”

    Previous meaning of BTDM was 4 hours. Now we’ve changed it and hope it will change the situation. We’ll see…

    Thanks for your advices. ๐Ÿ™‚

    #60186 Reply
    Pix
    Guest

    You’re welcome,

    If I’m right, then I’m like the Dark Knight of GSM

    (except I don’t have much hair on my chest, and my car barely reaches 110km/h)
    (it does have a weird smell, though, that scares dogs away)

    #60187 Reply
    Kamal
    Guest

    By d way,lexa GS was on..? Paging is done via sgsn or msc only..?

    #60188 Reply
    C300G
    Guest

    If it’s mass-probles, check PAGING channels statistics on problem LAC. Is thre enough paging channels? No SDCCH overloads?

    #60189 Reply
    Santanu
    Guest

    There is a Paging response problem in one MSC with MOTOROLA BSC’s. The paging response fail is about 35%. Suddenly it happaned. What can be the cause??
    Please help me…

    #60190 Reply
    Ayat
    Guest

    Hello all

    in our network , in some LAC we have paging sucesss rate(%) without repaing 83% and with repaing (paging for 2 nd time ) 84% paging timer is 6 sec.

    so i have no idea about this fail except the MS ia battery less or out of coavarge .

    Could you help me

    and give me hint how i can start

    #60191 Reply
    Santanu
    Guest

    Ayat,

    the paging if degraded then just check the paging req first from MSC if that increased??? if not then check the MSC BSC signalling links if those are congested then paging will be discarded…

    #60192 Reply
    Aly
    Guest

    We are facing the same problem as Lexa in our network, would appreciate any help or guidelines. Our System is Huawei MSOFTX3000.

    #60193 Reply
    ayat
    Guest

    thanks

    i will do

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