Suddenly loss of signal in smartphones and Dropcall

[alcatraz]

We started experiencing this issue after we went from RAN10 to RAN12.Do anybody haved experienced this issue? Any informatio would be apprecieated.

[qaqa]

hi
I have the following questions:
1- Is it only happening for Smartphones? what about ordinary phones.
2- Maybe some bugs or malfunctions of your RRU boards after the upgrade. have u checked with Huawei? I can see a sudden increase of your UL BLER.
3- were you using diversity, before/after upgrade?

[mike_symbol]

hi,

Check settings before and after with reference to your CFGMML.

There maybe configurations that change or accidental change.

regards//

[alcatraz]

hi
I have the following questions:
1- Is it only happening for Smartphones? what about ordinary phones.
2- Maybe some bugs or malfunctions of your RRU boards after the upgrade. have u checked with Huawei? I can see a sudden increase of your UL BLER.
3- were you using diversity, before/after upgrade?

Hi. Thanks for your response.

answers

1: Aparently yes. Now it's difficult to find 3G phones that are not smarthphones... at least in our network.
2: Yes, but they don't know what is happening.. :confused:
3:Yes.


The funny thing is that for an example if you have 2 Ue's 1 of them happens and the other not.

I was thinking.. could it be something wrong in the Power Control?? because suddenly you loss the RSCP in one of the UE's.

Thanks for your help.

Thanks a lot.

[jmasterfunk]

I am seeing this a lot in our RAN12 network. During a UE trace, there are RRC measurement reports, and then suddenly a RANAP_RAB_RELEASE with a cause of radio-connection-with-UE-lost. We are hoping RAN13 will fix this.

[zeezzoo]

Actually we faced the same problem in our network also after upgrading to R12 . Huawei couldn't help . but after re-dimensioning the RACs (by coincidence), the problem disappeared . but the funny thing is i don't think there's a relation between the RAC & this problem .

PS : the RAC is used only once even within different LACs .

[jmasterfunk]

We have seen small gains from splitting FACH and PCH onto their own SCCPCH.

We also do have plans to split our RACs, as we have very high paging utilization.

[Bob.]

Could you please tell me which counters/what kind of formula do you use to assess high paging utilization in HW? There's a standard KPI for Paging Congestion Ratio but what about utilization?

BR,
Bob.

[jmasterfunk]

Measurements related to signalling > Measurements related to Paging per cell > VS.UTRAN.AttPaging1

And in the M2000....
Traffic Measurement per cell, And calculate utilization using VS.CRNC.IubBytesPCH.tx and VS.CRNC.IUB.PCH.Bandwidth.

(VS.CRNC.IubBytesPCH.tx / <measurement period in minutes> / 60) / VS.CRNC.IUB.PCH.Bandwidth = PCH Utilization.

[baltoudi]

Hi,
does anybody know the similar formula in E/// for PCH Utilization in order to assess the paging load, etc before coming up with a decision of LAC/RAC splitting?