would you please give more detail about C/A let say I have BCCH 20 and adjacent BCCH is 19 what must be the Rxlevel difference between them it is -9db in this case the sdjacent BCCH some times will be stronger as you make by equation C-A>=-9 is it write?????????
thanks alot and just one more Question about the last sentence(it’s a very useful characteristic for frequency planning with multilayer (umbrella / micro)) what do you mean by this would you please give me more information?
C/A = rxlev(serving cell) – rxlev(adjacent channel)
with adjacent channel = a channel which is adjacent to the serving channel by -1,-2,-3, +1, +2, +3 offset. (depends o your configuration)
C/I = rxlev(serving cell) – rxlev(cochannel)
with cochannel = same frequency as serving cell.
they can all be +ve or -ve ! but it happens that in a gsm network, only the cochannel interference are very dangerous. So frequency planning needs to pay particular attention to C/I, and keep it as high as possible.
for C/A, it can be negative since it won’t affect voice quality.
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