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eLTE IntraNode Interference

Publication Date:  2018-02-14 Views:  25 Downloads:  0
Issue Description

This is the customer repport:

Dear friends, the problem is that we are having to much interference in the DC of the project, this site is around 0.8 km from the eNodeB 19 as you can see here:

Handling Process

To test and verify the problem of interference we shut down all the network and  power on only one cell of the site 19 and then the 3 cells, and this is the result:

 
Ass it can see in the red arrow, the interference when the customer shuted down the network and leave only one cell of the site on is around -110 dbm and as soon as they power on the remaining 2 cells of the same site
The interference went to around -90 dbm.

The configuration parameters of the sites are the next:

The model of the RRU is eRRU3255,

 Problem Analysis: First remove external interference ,Analysis of the results of recent dragnet test ,there are strongth  external interference  in the environment. When the whole network closed the station sweep, found in the north of the customer region serious interference, due to interference intensity and the region are large, unable to accuately lock the interference source, but from the 100M bandwidth sweep results, 360MHz-410MHz frequency band exists Serious interference related screenshots.

 

Root Cause

Client Environment & Foundation Quality-Air conditions

Solution

It is caused by external interface. External interference need to be solved at first

END