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reasons for tch drop rate

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  • #42748 Reply
    anni
    Guest

    Hi all,

    what are reasons for tch drop rate (gsm & nokia bts)

    regard’s
    yogesh

    #42749 Reply
    Sayed
    Guest

    Tch drop rate mean call drop rate so you may have alot of reason for call drop:

    1-unbalance DL/UL
    2)-Lack of coverage
    3)-Interference so frequency problem

    4)-hard ware problem like TRAU problem
    5)-Parameters mistake
    so its a general question

    #42750 Reply
    krimo
    Guest

    Hello Guyes
    if we have drop calls due to bad quality in the uplink what we should do in this case
    thanks
    krimo

    #42751 Reply
    Sayed
    Guest

    Do you thgink its not clear , i write alot in this acse

    #42752 Reply
    Boboo
    Guest

    if we have drop calls due to up quality, hardware issue on TRX must be suspected. Check on site the uplink path in order to verify if there is something wrong closed to the connector.
    and maybe the TRX is faulty.

    regards.

    Boboo

    #42753 Reply
    Boko
    Guest

    Check interference measurements on idle channel first. if you have some go with a specrum analyser to the site.

    rgds
    Boko

    #42754 Reply
    wajid
    Guest

    hello friends

    there are drop calls in all the sites ,with lost TCH radio link,lost sdcch radio link
    when checked in OMC-R report

    please let me know what i need to do, do i have to perfofm Drive test and check log files.

    national call in the network are free, if the duration of calls exceed 20 minutes ,the MSC drops the call.

    can i relate this reason for lost TCH and SDCCH radio link.

    please advise

    #42755 Reply
    Boko
    Guest

    Hi Wajid,

    You shoud have some release channel command from MSC to BSC so it’s not counted as TCH drop, besides you said you also have SDCCH drop.
    BTW in which country you have free national calls?

    rgds,
    Boko

    #42756 Reply
    wajid
    Guest

    i am talking about somalian 4th operator somafone.

    i am here in somalia representing Tecore wireless systems.

    #42757 Reply
    Testa
    Guest

    Hi Wajid,

    I think as you are using an automatic voice mail to perform your drive test”, there is a timer in the Core Network which automatically release the call after 20 minutes exactly.
    You can perform several test in static under good rf condition calling this “voicemail” and confirm the drop occurs exactly 20 minutes after your start.

    “national call in the network are free, if the duration of calls exceed 20 minutes ,the MSC drops the call.

    can i relate this reason for lost TCH and SDCCH radio link.

    please advise”

    Regers
    Testa

    #42758 Reply
    more
    Guest

    its reasonable to lose TCH under constraint release from MSC.
    But SDCCH lost may had another reason.? is it right??

    #42759 Reply
    TechMan
    Guest

    Wajid,

    “….. if the duration of calls exceed 20 minutes ,the MSC drops the call.”

    These so called “call drops” are MSC initiated normal call clearing and would not be pegged as TCH drop.

    #42760 Reply
    Nitin
    Guest

    Check the CDMA collocation for the uplink quality problem.

    #42761 Reply
    wajid
    Guest

    what is acceptable number of Call
    Drops in any network.
    Is there any network which is has no call drops at all

    #42762 Reply
    jood
    Guest

    As long as you making your traffic dimenssion with B formula(GoS erlang E), as you have lost TCH.& so drop TCH.
    You can have Zero drop if you make your traffic under C formula, & this is not commercial network (private network).

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Reply To: reasons for tch drop rate
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