- This topic has 98 replies, 1 voice, and was last updated 8 years, 10 months ago by chis.
5th March 2010 at 11:25 #35785SHELDONGuest
I think SDCCH drops in A interface are included in the calculation of SDR. They’ll fall under drops due to ‘OTHER’12th March 2010 at 08:56 #35786MuckyGuest
if you using ericcson bts,and
you want to reduce SDCCH Drop, trying to push SDCCH allocation to Channel Group 0. check the BSC properties for maximum SDCCH allocation per TRX and after that you can reduce paging load with adjusting MFRMS value.13th March 2010 at 14:25 #35787MakGuest
SDCCH Drop on A interface is not calculated in the SD drop formula. But when you see the ND report, you will found the counter of Sd drop on A interface.14th March 2010 at 13:28 #35788Paul C SGuest
What we have to know is the difference between fail & drops.
SDCCH Fail ==> it simply means that channel SDCCH hasn’t seized the TImeslot in TRX. It’s sometimes due to SDCCH Congestion, TRE Faulty which carries SDCCH TS or even bad SDCCH TS in TRE.
SDCCH Drop ==> it means that SDCCH channel has seized SDCCH TS in current TRX, but due to bad radio condition (Qual, Interference), then this channel drops. It’s also due to BAD SDCCH TS.
I suggest you to re-allocate SDCCH TImesot to another TS. Remember to pur the SDCCH TS not in TS0.
Paul C S16th March 2010 at 10:17 #35789ikbelGuest
hello, which are the KPIs that influence the SDCCH drop? how can I reduce the Sd drop?17th March 2010 at 10:46 #35790Paul C SGuest
Parameters which influenced SD drops : SDCCH Drop HO + SDCCH Drop radio + SDCCH Drop BSS
How to reduce SD Drops : you have to find out whether it is from radio, HO or BSS.
For radio, you should try to check first the TRE which has SDCCH Channel (ussually TRX 1). Then try to change SDC allocation to another TS.
What equipment do you handle? ALcatel, Ericsson?
Unfortunately, in Alcatel, I haven’t found an indicator that shows us the most SD Drops TRX contributor.
Also please check the Interference Level, either in UL or DL.
Paul C s16th April 2010 at 11:00 #35791AKGuest
the range RX level is -47db to -110db, my doubt is why it is has got a negative figure?16th April 2010 at 12:19 #35792BrotherGuest
Actually it is not db it is dBm
The difference between dB and dBm is;
dB is relative to a specified unit, and also dimensionless because values are divided (watt to watt for example)
dBm is absolute value and “m” is for “microwatt”
there are more decibel units, for antennas dBi is used and here i is for “isotropic”, gain of antenna is defined relative to isotropic antenna.
so minus corresponds a watt value actually you can calculate it or convert and find corresponding value.
decibel is used because using “watt” makes things complicated so many digits so decibel makes things simple17th April 2010 at 11:14 #35793vijuGuest
which core parameters i have to check in NOKIA system to improve HOSR
?17th April 2010 at 12:28 #35794ChairilGuest
How about siemens equipment?23rd April 2010 at 06:25 #35795prashanthGuest
what is tch and what for it is used27th April 2010 at 11:42 #35796varun sharmaGuest
“tch” is traffic channel and it uses for carry the user information either voice or data.5th May 2010 at 06:44 #35797SANJAYGuest
How to corelate SDCCH & TCH with BTS installation quality.5th May 2010 at 07:43 #35798OrstineGuest
Hello Brother, can you give me a formula that relates dB and dBm. I also like a detail explanation of the difference between the two units. Pls throw more light on the negative sign that always preceeds dBm. Thank you5th May 2010 at 11:47 #35799PixGuest
can you please search in other topics (use the search feature), it was already exlained many times.