- This topic has 9 replies, 1 voice, and was last updated 12 years, 10 months ago by srd.
16th May 2007 at 19:12 #47283adeelGuest
hi, rf planners in out network are using same BSIC for co-sited cell. according to my previous experience, we never used same bsic for cosited cell or with any other neighbor. can some one tell me that for neighbors, do we have to keep both BCCH/BSIC different, or can anyone among the two be same?16th May 2007 at 19:45 #47284PixGuest
bcch must be different, always, by at least 2 channels separation (ch 01 and ch 03, for instance)
bsic can be equal (there is only 8 possible bsic values, and you will mostly have more than 8 neighbors for a give cell 🙂 ), it will not lead to any problem as long as bcch is different17th May 2007 at 11:27 #47285oharazuGuest
easier to understand that… two parameters to differentiate who r u… bcch and bsic. when bsic is the same… bcch must not be the same to avoid interference..perhaps.
in metropolitan area, u may have alot of interference come from nowhere.. so that bsic will difference them.. but u sacrifice quality here.18th May 2007 at 09:43 #47286finnGuest
i experienced identical bsic in a site but different bcch… its working fine18th May 2007 at 16:20 #47287PixGuest
Don’t say “perhaps” 🙂 Having 2 sites in the same vicinity with the same BCCH will always lead to interference, even if the BSICs are different.
Yes, different BSIC are only useful to differenciate sites using the same BCCH.13th November 2009 at 09:52 #47288BaduGuest
Are you sure there are only 8 possible BSIC value?
Do you know this BSIC is combination of ncc & bcc?13th November 2009 at 20:55 #47289PixGuest
Yes, I think i’ve heard about it :))
Sorry about this, actually i think i made the assumption that one operator gets only 1 NCC. Therefore, only 8 BSIC available. (1 NCC / 0…7 BCC)
This assumption is wrong, because one operator can actually have more than 1 NCC.
Thanks for pointing the error out 😉
Pix16th November 2009 at 11:44 #47290srdGuest
i have one question about BSIC?
We just can use (0.1.2….7)octal code for define BSIC..why??
what is the limit?
thanks16th November 2009 at 13:37 #47291PixGuest
The BCC is a field which is coded over 3 bits only. So the range of values is limited to 8.
The NCC is too defined over 3 bits. Therefore 8 values possible.
Each operator gets 1 or several NCC (within one country). Other operators from the same country gets different NCC’s.
The BSIC is the combination of NCC and BCC.
If one operator has NCC 1 and NCC 2, then it can use 16 BSIC:
I hope it helps,
Dr. Pixreinstein16th November 2009 at 18:15 #47292srdGuest
thanks pix your info