Parameters versus RTWP degradation in UMTS

3G / 2G
,
1

Hello Experts

What parameters to check to ensure RTWP degradation in UMTS is not relation to configuration?

2

Any increase in users and traffic?
RTWP checked in busy hour or non busy hour?

3

In busy hour AND non busy hour.

4

And before was it Ok?

5

What is the value of the RTWP?
Any hardware action has been implemented on the site?
The degradation on one site or cluster or more?

6

-101 on U2100 carrier.
1 site only: 1 carrier and 1 cell (beta cell)

7

Hi Collegues.

Many cells U900 suffer from degradation of RTWP, and for all radio technology Ericsson, Nokia and Huawei.

Is there is main cause for that?

Thanks in advance

8

I think :
First you have to check vswr on all branches, and their sould be no big difference among branches.

Second, if VSWR values and antennas ports are OK you should check interference in UL.

9

Is the trend continuous or the RTWP settles in non busy hours?

10

The cells are clean in terrms of alarms and also, the load trafic is normal.

This situation is general in major of U900 cells.

11

I have many cells as well which have degraded RTWP and the reason is load.

With load U900 RTWP degrades a lot.

12

The trend continuous.

I checked load, it is normal.

13

Can you pls share the highest and lowest value they achieve, cell hourly?

14

Margin -80 dBm to - 70 dBm.

15

A few questions will help to understand the network scenario:

  • Was U900 configured after GSM900 refarming?

  • Is U900 configured with carrier 4.2 bandwidth for UMTS?

16
  • Example of values in all branches for one sector?
17

No difference between two branches e.g some values with average - 75 dBm.

Yes.

18

We have faced issue with few u900 cells where bandwidth was configured as 5 MHz instead of 4.2 MHz.

Correction resolved the issue.

19

As far as I understand from all the things you all have mentioned till now, it seems its a kind of external interference.

There are applications in vendors to detect it.

Try in few cells.

For example in Nokia - You have RF monitor app to investigate it.

20

Hello dears, you can also check: Mitigating RTWP in Telecom: A Step-by-Step Guide