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Penalty Time -> 2G to 3G

Kwame - 21st August 2015  (16:10 GMT)


Please i have an issue with 2G-3G cell reselection. If an MS is on 2G, it stays there even if the radio conditions for 3G are good.

Any ideas?

Vitalie - 2nd June 2014  (19:27 GMT)

Hi Styrax,

We faced the same issue with UE reselection back to 3G when I activated 3G Fast Reselection.
2G vendor is ALU and 3G is Huawei.
Additional negative impact was increasing of Registration rate in 3G and Location_Update_Rate in 2G.
The results are contrary to expectations

pix - 29th April 2014  (09:17 GMT)


I'll see what I have & send u email.


Styrax - 28th April 2014  (10:29 GMT)

Hi Pix,

Now i'm really confused, after disabling the parameter "EN_FAST_3G_RESELECTION", the IRATHO PS Fail due to UE reselection back to 3G decreased for 3g cell for which this parameters was changed for 2G neighbors cells

but changing the parameter "EN_2G_TO_3G_CELL_RESELECTION" from 1 to 2 (disable the reselection when UE is in ready status) didn't bring any improvement for IRATHO PS fail

i need to understand the whole IRATPS HO process, PLZ Pix if you have any doc about IRATPS HO signaling flow (E2E) thx to send it to my mail
mail :


Styrax - 23rd April 2014  (16:32 GMT)

Hi Pix,

Could you confirm if following 2g to 3g cell reselection (in idle or in packet transfer mode) can impact 2G KPI (CDR, CSSR, and traffic), because we are facing a degradation on some cells after changing these parmaters:

- En2gTo3gCellReselection 1
- En2gTo3gtddCellReselection 0
- EnCpich2g3gReselection 1
- EnFast3gReselection 1
- FddMultiratReporting 2
- FddQminOffset 0 dBm
- FddReportingOffset 0
- FddReportingThreshold 0
- FddRscpmin -114 dBm
- QsearchC -70: Always search for 3G neighbour cells
- QsearchI -70: Always search for 3G neighbour cells
- QsearchP -70: Always search for 3G neighbour cells
- ACmbFDD_Qmin -12dB
- ACmbFDD_Qoffset -32: Always select a 3G cell if possible
- AGprsFddGprsQoffset -32: Always select a 3G cell if possible
- AGprsQsearchPPtm -70: Always search for 3G neighbour cells


pix - 23rd April 2014  (10:46 GMT)


which status the UE will be after IRAT PS handover from3g to 2g?

The MS in 2G will be in PTM, after a 3G2G IRAT PS reselection.

If you want to make the reselection to 3G more difficult during 2G PTM, then increase FDD_GPRS_Qoffset.


Styrax - 23rd April 2014  (09:25 GMT)

Hi Pix,

Just to clarify that, below you cited different 2G ALU parameters for 2g-3g reselection, what I'm trying to do is to make the reselection from 2g to 3g difficult and that by changing the "FDD_Qoffset" and "FDD_GPRS_Qoffset" value.
But i am confused, which one of previous parameters should i change? the 1srt is for MS in idle mode and the 2nd is for MS in PTM (transfer mode), that's why i asked you previously in which status the UE will be after IRAT PS handover from3g to 2g?

PLZ clarify this point
Many thx

pix - 22nd April 2014  (18:30 GMT)


the UE can come from 3G to 2G in idle mode, in speech dedicated mode or/and in packet dedicated mode.

All scenarios are possible, and might be independantly activated or deqctivated.

If you have an issue of idle pingpong between 3G and 2G, then you must ensure that idle "exit parameters" from 3G have weaker values than the idle "exit parameters" from 2G.

You have to put both idle algo side by side in order to find a stable stragegy.


Tyrax - 22nd April 2014  (16:31 GMT)

Hi Pix,

PLZ the UE come from 3g to 2g, it will be in which status? idle, PIM or PTM?
because i'm facing same Pb as "Optim", so do you have an idea how to avoid the UE reselection back to 3g when he came from 3G cell?


pix - 25th January 2011  (19:46 GMT)


I think those parameters are generic, because reselection is a very generic (3GPP) procedure. If there are some differences, I'm certain they are minimal and will be easily overcome by a tenacious mind.

Only the HO 2G to 3G is not standard (i think) so I'll let you handle that one by yourself.

Let me know how it goes,


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