High RTWP for UMTS900

[fahmi]

Hi,
Plzzzzzzzzz, could anyone tell me why the RTWP is very high for U900 and not for U2100 for the same sector ?.:funk:

is that related to the load of the cell :confused:

[cocoloco]

It could be due to external interference in 900 MHz but not in 2100 MHz

[zlobster]

Hi,
Plzzzzzzzzz, could anyone tell me why the RTWP is very high for U900 and not for U2100 for the same sector ?.:funk:

is that related to the load of the cell :confused:

Hi,

Please give us some numbers.

Do you have GSM900 service nearby?

The noise rise of a loaded cell is only few dB.

External interference?

[fahmi]

Hi,

Please give us some numbers.

Do you have GSM900 service nearby?

The noise rise of a loaded cell is only few dB.

External interference?

thank you,

please check these figure,

-first one, U900,
-second and third, U2100 FDD1 and FDD2.

all of them for the same sector, if it is an external interference why it appears for U900 and not for U2100 :confused:

[cocoloco]

Maybe because there is an external interference that only affects to 900 MHz, for example an inhibitor.

[zlobster]

Hi,

No problems.

However, I do not have sufficient reputation to view your pictures...:(

I'm just now starting in this forum...

Can you embed the pictures?

You could also perform a band scan (don't know your vendor) and see if there's something unusual in your allocated spectrum.

Yes, it could be an external interference - just not so wideband to affect U900 & U2100 simultaneously...

P.S. You didn't mention if you have GSM900 cells nearby.

[agenov]

thank you,

please check these figure,

-first one, U900,
-second and third, U2100 FDD1 and FDD2.

all of them for the same sector, if it is an external interference why it appears for U900 and not for U2100 :confused:

Have you investigated these peaks of RTWP reaching 0dBm, it is quite strange.
What else you can do is to start Frequency scanning test from the Nodeb where you can get real time picture of possible interference.
Also start routine test in M2000 for at least 1-2 days and load it in the Nastar to see whether you can gain something from there.
Check for possible interference as other member said from neighbouring GSM cells.

BR

[riyantoyadi]

using LMT online monitoring could see RTWP on realtime, please let see the increament :

if external interference : main and div signal on same increasing wave
if internal problem : main and div signal different increasing wave