- This topic has 9 replies, 1 voice, and was last updated 12 years, 9 months ago by Arpan.
11th May 2007 at 07:01 #47209EEEGuest
a cell whose TCH and SDCCH Drop reasons are higher. The reason of sdcch drop is generally due to other reason and the reason of TCH drop reasons are generally low quality uplink,signal strength downlink and sudden loss.
Also this cell DISCBQ and BADSQI statistics are higher than KPI threshold values. (Ericsson Systems)
Thanks for your help.11th May 2007 at 07:52 #47210PixGuest
1st step : detect hardware failure
check the Path Balance,
check the drops per TRX11th May 2007 at 07:53 #47211PixGuest
2nd step : detect radio problem
check that neighbors are well defined
check that coverage is good until PBGT HO is performed towards a neighbor
check indoor locations which could generate a lot of traffic with a poor coverage
check interference11th May 2007 at 07:56 #47212PixGuest
finally : additional work…
understand why and where the drops are occurring.
what type of outgoing HO are performed (quality, level ?). What about incoming HO ?
what is the average duration of a call, for each TRX.
and so on.11th May 2007 at 08:37 #47213eeeGuest
this cells some neighbours are away from itself and handover attempts are low with these cells but especially incoming HO failures are so high.
Also generally incoming HO failure percentage so high.11th May 2007 at 11:08 #47214EEEGuest
I wonder that if I increase the downtilt of antenna, will it be solution.11th May 2007 at 14:54 #47215pixGuest
no it will decrease the coverage of the cell even more ! it seems there is a typical coverage problem. You must find a way to increase the coverage in the places where you have the more traffic…
(re orientation, TMA, or maybe uptilt, if you already have a downtilt).28th June 2007 at 10:04 #47216AyatGuest
how are you?
i have a question .
In ZTE vender , they have SDCCH and TCH Congestion are high
i am asking if there is soluation on increase no of channel ???
and i need to know what is TCH allocattion and TCH assign.
i knowolu one thing that tch allocation occues between BSC and BTS , assign between BTS and MS.
In our network the most sites have allocte > assign
Plz could you help me ?????????2nd July 2007 at 12:46 #47217ADGuest
yes you are right. as per my understanding…allocation means when BSC has ‘reserved’ a channel to be assigned but not actually assigned it. Assignment means when the channel is actually given to MS to communication.8th March 2008 at 09:23 #47218ArpanGuest
TCH Allocation Successful= TCH Assigned Successful + TCH Assignment Failure