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Which RF measurements do LTE UE take when in idle mode instead of normal SINR?


#1

Dear Experts, which RF measurements do LTE UE take when in idle mode instead of normal SINR?

How can I resolve poor SINR issue when the RSRP is good.

Thanks


#2

Check for interference n resolve…If no hardware or transmission issue


#3

Overshooting !!!


#4

Poor SINR and good RSRP can be due to strong overlap of cells/no dominancy , overshoots, PCI mod conflict or even hardware problem

Also traffic/load of the cells can be one cause.


#5

We have enough traffic on 900band and the PRB for most cells are used up due to congestion


#6

Reduce overshoting
Sinr = signal/noise+interference
Since rsrp is good mean signal is good
Now you have to reduce interference and noise to get good sinr
Simple design action could help a lot


#7

Is it possible for high traffic to affect SINR? How can this be prevented for a good post drive result


#8

Sure it does affect. Reduce overshooter is mandatory. You can down tilt o reduce power for the cell monitored by drive tester


#9

Yes. The pdsch from other cells interferes with the RS from your target cell.

But instead of measuring sinr , measure serving rsrp and neighbour rsrp. There should be fewer than 3 neighbour cells within 5dbm of your serving rsrp. And 6 within 10dbm


#10

also are you on TDD or FDD, make sure if you’re on TDD you’re obeying mod3, can cause serious problems on frame synced networks.


#11

Ok thanks.

FDD. Dual band 900/1800


#12

ah yeah mod3 doesn’t matter as much then.


#13

Good but I am seeing mod 3 bad spots in my analysis.

Not much though
What can you say about these PCI:303 and 309

318,324,305

Any MOD interference here


#14

303 = 0, 309 = 0, 318 = 0, 324 = 0, 305 = 2
even if it’s FDD that might be causing some issues
as there is a lot of 0!