Transmit Power vs. Downtilt

[apo7]

For overshooting cells, we always downtilt that particular cell. Why we don't just change the transmit power parameter in the database to prevent the cell from overshooting. What are the cons of changing the transmit power?


Thank you.

[NILCTG]

U may loose/reduce indoor coverage if u change Transmit power. Also u have to change a number of relevant parameters(such as power control parameters) in the database.

[RF engineer]

Dear
Normally tilt is the first choice because any decrease in output power let say by 3 dB it means you reduced the radius coverage by around 45 to 50% and the area of coverage by 22 to 25 %. so you can see from the percentage the change of power is critical just it will as final solution.

[apo7]

Dear
Normally tilt is the first choice because any decrease in output power let say by 3 dB it means you reduced the radius coverage by around 45 to 50% and the area of coverage by 22 to 25 %. so you can see from the percentage the change of power is critical just it will as final solution.

Do you have any documents that show the relation between the transmit power and the coverage radius/area?

Thank you.

[ghassen]

Do you have any documents that show the relation between the transmit power and the coverage radius/area?

Thank you.

there is no doucument at now but this is a matter of experience in RF engeneering

[ghassen]

there is no doucument at now but this is a matter of experience in RF engeneering

i will try to find some

[RF engineer]

Dear
let assume your out put power is 46 dBm then convert to watt it gives around 40 watt if you reduced from 46 to 43 it give you around 20 watt so half power gone so it means half coverage radius gone the coverage is A=K*(R)^2
K is constant let say R is reduced to 1/2 it means 1/4 it gives around 25%.
BR
RF

[dexterhaba]

will downtilting increase indoor coverage? Also there is a topic which says 1800 frequency can have better penetration than 900,, but to my experience 1800 sites have very low indoor coverage compared to 900 , but for IBS 1800 is better than 900?? , why is that?

[torex]

The usage DCS 1800 for IBS mostly to prevent spillage in surrounding area of building which may cause another problem for example call drop if user in high speed car pass by.

will downtilting increase indoor coverage? Also there is a topic which says 1800 frequency can have better penetration than 900,, but to my experience 1800 sites have very low indoor coverage compared to 900 , but for IBS 1800 is better than 900?? , why is that?

[newbielinz]

For overshooting cells, we always downtilt that particular cell. Why we don't just change the transmit power parameter in the database to prevent the cell from overshooting. What are the cons of changing the transmit power?


Thank you.

dear friend,

reduce transmit power is one of the solution to reduce the overshooting, but unfortunately it will reduce coverage and have big impact to indoor penetration loss.

so u must carefully if you wanna reduce any power because it will have big impact to the end user directly.


thx
Newbielinz