- This topic has 14 replies, 1 voice, and was last updated 7 years, 1 month ago by Solee.
9th February 2009 at 19:51 #55701sunGuest
Can someone help me with the following questions:
What are the results if there are 2 sectors with the same freq aiming to each other?
What is the reason that the power of the serving cell is smaller then the neighbouring cells, but still won’t HO. Is it because of the freq interference?
Thank u10th February 2009 at 21:41 #55702ujiGuest
when 2 sectors facing towards eachother vid same frequency is nt the complete question i want to knw whether they r having same hsn or nt, if yes then it will facethe downlink interference which inturns effect the quality.11th February 2009 at 08:50 #55703PixGuest
>> What are the results if there are 2 sectors with the same freq aiming to each other?
High call drops, impossible to make HO, impossible to make a call setup.
>> What is the reason that the power of the serving cell is smaller then the neighbouring cells, but still won’t HO. Is it because of the freq interference?
Cell A and Cell B are neighbors. Therefore, they don’t use the same frequency.11th February 2009 at 15:55 #55704sunGuest
Thank you guys for your answers.
The sectors have different hsn.11th February 2009 at 19:57 #55705PixGuest
So they have different frequencies.20th February 2009 at 16:11 #55706ImtiazGuest
The title of your post says “BCCH Interference”. If I analyze your first question in this regard then:
Question: What if two BCCH sectors having same BCCH Frequencies are facing each other?
Answer: As Pix mentioned, call setup failures, call drops, HO failures, interference etc. HSN does not matter because BCCH TRX has a single frequency; the BCCH Frequency (It is not on hopping)
Question: What is the reason a mobile terminal remains camped on on a cell (serving cell) even when neighbouring cells show better levels?
Answer (considering only level handovers): According to cell reselection criteria, HO takes place when a mobile terminal sees that a cell has levels that are greater than levels of the serving cell by some threshold; i.e.,
Level (new cell) > Level (serving cell) + Threshold4th May 2010 at 20:15 #55707Fresh OptGuest
if BCCH is interfered (Co-channel or adjacent), what happens with calls on other TRXs with different frequencies (non hopping or SFH)? Will those calls have degradations in quality?
Fresh Opt5th May 2010 at 07:19 #55708paraGuest
“Answer (considering only level handovers): According to cell reselection criteria, HO takes place when a mobile terminal sees that a cell has levels that are greater than levels of the serving cell by some threshold; i.e.,
Level (new cell) > Level (serving cell) + Threshold”
Also, penalty time may hold MS camped on a cell (Act) even though NC1 may display a better C1 and C25th May 2010 at 08:28 #55709SHELDONGuest
No, you wouldn’t have a degradation in quality, unless those frequencies are also interfered themselves.
However, you’ll have a degradation in quality if the calls are setup on the BCCH TRX.
SHELDON5th May 2010 at 09:48 #55710Fresh OptGuest
but, what about system information (SI), would they be decoded by MS. Or will measurement reports well understood by BTS? Because all these informations go through BCCH.
Fresh Opt5th May 2010 at 11:46 #55711AnshuGuest
so frnd wat u think about BSIC…?5th May 2010 at 11:46 #55712PixGuest
It depends on whch direction is your interference :
DL BCCH interference : poor SI decoding, poor paging sucess rate, poor SDCCH assignment % (if SDCCH on the TRX1), poor SDCCH Drops and poor TCH establishment & TBF establishment on that particular TRX.
Other TRXs are not impacted. (= tCH & TBF allocation on those TRX is still fine)
UL BCCH interference : poor RACH success + SDCCH assign & drops + TCH/TBF estab fail%
Now, if a MS is camping on a cell from which the SI msg are mis-decoded, then the MS will reselect another cell.
Same thing if LU & call setups can’t go through, a reselection *should* occur.
pix5th May 2010 at 14:14 #55713Fresh OptGuest
Thanks guys!12th March 2014 at 16:01 #55714maheshGuest
what is bcch and bsic in practically4th April 2014 at 05:52 #55715SoleeGuest
Kindly Advise me what changes In cell Reselection Functionality would occur if I have Neighbors with the same BCCH!??