Small coverage prediction in Atoll Simulation !

[bluep]

Hi all
I'm using Atoll 2.8 for making 3G project simulation, with 850 frequency
However, after import cells, sites, transmitters, define Cost-Hata, use defaut equipment and change freq to 850, the coverage plot is too small ( not good as 2G simulation )
Could you pls give me some advices ?

[proy1_10]

Can you check antenna's distance over the ground?

[peanut]

Dear, I would think first to do a first check of all power related parameters

best regards,

[dmitry28]

It seems to me that at this frequency it is better to use a Okumura-Hata model

[b0r3l_1]

Check your CPICH value

[baby2]

if 1st time 3G predictoon.

you should try Macro site ,1st
and chk the coverage with reasonable?

[baby2]

3g key coverage pattern
1) model prediction
2) cpich , almost 10%
3) antenna height
4) gain antenna
5) area ,urban ,sub urban

[bluep]

Hi all
Tks a lot for your advices
It's the first time I do 3G prediction, all parameters are default . Power, loss, anten height... are imported OK
Attached files are my cells, sites and transmitter defined, could you please give me some instructions ?
Tks tks a lot

[pl_ev_7]

Do you have building heights in your geodata? if your antenna height is bellow roof level, it might explain small or no coverage.