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Hi all,
what are reasons for tch drop rate (gsm & nokia bts)
regard’s
yogeshTch 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 problem4)-hard ware problem like TRAU problem
5)-Parameters mistake
so its a general questionHello Guyes
if we have drop calls due to bad quality in the uplink what we should do in this case
thanks
krimoDo you thgink its not clear , i write alot in this acse
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
Check interference measurements on idle channel first. if you have some go with a specrum analyser to the site.
rgds
Bokohello friends
there are drop calls in all the sites ,with lost TCH radio link,lost sdcch radio link
when checked in OMC-R reportplease 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
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,
Bokoi am talking about somalian 4th operator somafone.
i am here in somalia representing Tecore wireless systems.
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
Testaits reasonable to lose TCH under constraint release from MSC.
But SDCCH lost may had another reason.? is it right??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.
Check the CDMA collocation for the uplink quality problem.
what is acceptable number of Call
Drops in any network.
Is there any network which is has no call drops at allAs 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).
