It's just my notes.

Maybe it's not important to you, but it's mine!

Phantom RACH

 

I have just read about this case. At first I felt strange in hearing it, because I haven’t heard it before. We know about BCCH Freq and BSIC, don’t we?
BCCH Freq is frequency channel that is used to carry or transmit BCCH. One Cell has one BCCH.
BSIC (Base Station Identity Code) is Code that is used to distinguish Co-Channel BTSs. It is comprised of NCC(Network Color Code) + BCC(Bas Station Color Code).
If there are two BTSs are close each others with different BCCH and different BSIC, It will not be a problem. Each BTS will erceive RACH from its own MSs. 
But If those two BTSs have different BSICs but have same BCCHs, It may cause Phantom RACH. MS will transmit a RACH to those two BTSs with just one certain BSIC. The BTS who has this BSIC will responce this RACH, but the other BTS who doesn’t have this BISC will not response RACH. This is what we call Phantm RACH or Ghost RACH.

I have just read about this case. At first I felt strange in hearing it, because I haven’t heard it before. We know about BCCH Freq and BSIC, don’t we? 

 

  • BCCH Freq is frequency channel that is used to carry or transmit BCCH. One Cell has one BCCH.
  • BSIC (Base Station Identity Code) is Code that is used to distinguish Co-Channel BTSs. It is comprised of NCC(Network Color Code) + BCC(Bas Station Color Code).

If there are two BTSs are close each others with different BCCH and different BSIC, It will not be a problem. Each BTS will erceive RACH from its own MSs. 

But If those two BTSs have different BSICs but have same BCCHs, It may cause Phantom RACH. MS will transmit a RACH to those two BTSs with just one certain BSIC. The BTS who has this BSIC will responce this RACH, but the other BTS who doesn’t have this BISC will not response RACH. This is what we call Phantom RACH or Ghost RACH.

 

One response to “Phantom RACH

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: