- This topic has 7 replies, 1 voice, and was last updated 10 years, 9 months ago by Pix.
5th December 2009 at 05:26 #59999sureshGuest
We have checked all the parameters related to TCH & SDCCh drop in our BSCs.
We cannot find the reason for the drop.
When we give the restart to our system than drop is normal for 2 to 3 days but after that problem is repeat.
Kindly suggest if any solution is available for this isuues.5th December 2009 at 08:18 #60000PixGuest
The cause of the drop is either a hardware problem or a software unstability in the hardware.
Hardware could be : in the BTS, the BTS itself, the Abis equipment, the Abis radio link, the BSC boards, the connections, etc.
On how many cells do you see the high call drops ?
pix7th December 2009 at 09:51 #60001ArjinGuest
what are BSS Call Drop RTC (Remote TC) causes?7th December 2009 at 10:15 #60002PixGuest
Any hardware failure in the BSS will generate RTC call drops.
(TRX fail, SUM fail, Abis fail, BSC fail, TC fail, Ater fail, …)
The “Internal BSS” drops are linked to O&M actions (reset, lock/unlock) or weird software bugs.
pix7th December 2009 at 10:44 #60003ArjinGuest
we faced High RTC Drops due to High Traffic during sport events in some stadiums, is this also related to HW failure?7th December 2009 at 14:08 #60004PixGuest
It only happens when high load of traffic ?
Then the failure is probably linked to a board congestion. It’s not really a HW failure. You’re just outside the nominal use of the boards.
The board cannot handle more calls and drops on-going ones. Or something like this.
Could you compare your traffic carried by the whole BSC at BH with its capacity (check the BSC configuration, number of CCP boards, or TCU / DTC boards, etc)7th December 2009 at 15:39 #60005ArjinGuest
I’am talking about some cells and not the whole BSC.7th December 2009 at 16:12 #60006PixGuest
And those cells are always the same ? So in your case : congested cell = cell with high RTC.
So you must look at a problem in the BTS itself. Have you done any drive tests or A-trace analysis ?
Are you using AMR ?
In which release ?
I’ll try to find a related problem later.