how is C1 and C2 values assigned for GSM cells ?

[coursekec]

how is C1 and C2 values assigned for GSM cells ? Can anyone explain me the significance of CRO and how it is calculated ?

[radio_network]

it has been discussed earlier in this forum. follow the thread.
http://www.finetopix.com/showthread.php?t=3359

[coursekec]

But i am not still clear on how the parameter CRO is assigned for the cells ?
can you explain it please.?

[kevin_h811]

hi COURSEKEC,

U assign CRO when u want to extend your coverage, or u want to decongest neighbor sites.
If I'm not mistaken every value of CRO, 1 equals 2 or 3 dB. Just check ur BSC help reference.
Example, if u are -96 dbm(RSL idle) at 500m from the serving cell #1 and there is a nearest site,serving cell#2, around 400m, but at -100 dbm (RSL idle), most probably cell#1 will serve u, but if u want cell#2 to serve u, u change your setting of CRO from 0 to 3 or 4 (6 db plus), -100 dbm + 6 dbm= -94dBm, therefore cell # 2 has better RSL idle than cell #1 wherein your call will be camp on at the aforesaid cell.
Hope u understand my explanation...

BR//