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Penalty Time -> 2G to 3G

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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,


Optim - 25th January 2011  (13:11 GMT)

Thanks Loads Pix !!

But I also forgot to mention that our equipment is Ericsson . . .

Any idea abt their parameters or the ones quotes by you are generic?

many Thanks

pix - 25th January 2011  (13:00 GMT)

and I forgot something : are you using NC2 or not, in GPRS PTM ?

pix - 25th January 2011  (13:00 GMT)


here are the most important parameters... and my recommendations. Feel free to challenge them, or to discuss them, because I can't be certain those will work in your particular network.

EN_2G_TO_3G_CELL_RESELECTION = 1: Enabled with 3G search activated while the UE/MS is in GMM ready state
* to allow the 3G reselection *

* to reduce signalling load *

EN_CPICH_2G_3G_RESELECTION = 1: CPICH Ec/No and RSCP measurements must be used
* to ensure both level and C/I of the 3G are good *

EN_FAST_3G_RESELECTION = 1:only fast 3G cell reselection at 2G CS call release is used.
* up to you, use it (1) or don't (0) *

FDD_GPRS_Qoffset = 10dB
* when the MS is in GPRS PTM, it can reselect 3G cells which are 10dB better than 2G serving cell only. With such setting, the 3G reselection must be very difficult * * default = -32dB*

FDD_Qoffset = -10dB
* when the MS is in idle mode, it can reselect 3G cells with level(3G) > level(2G) - 10dB. With such setting, the 3G reselection must be more difficult than before * * default = -32dB*

FDD_Qmin = -6dB
FDD_Qmin_Offset = -4dB
* reselection only to 3G cells where Ec/No > -6dB (for pre R5 MS) or where Ec/No > -10dB (for post R5 MS) * (default = -12dB for all MS)

FDD_RSCPmin = -95dBm
* reselection only to 3G cells with RSCP > -95dBm * (default = -102dBm)

Qsearch_I (Idle mode / not GPRS attached) = Always (value 7)
Qsearch_P (GPRS PIM) = Always (value 7)
Qsearch_P_PTM (GPRS PTM) = Always (value 7)

* when would the MS start looking for 3G cells... this is very special, I'll let you look it up by yourself.. I recommend the value "always" in your case, to avoid a roblem. But you can optimize this value. When the MS stops looking for 3G cell, it saves battery !! So you could for example force the MS to search for 3G cell only when the 2G level is less than -74dBm (value 6), or only when the 2G level is better than -70dBm (value 10. It so strongly depends on your network design that I can't recommend anything else than "always" :) *

Enjoy :) (these are very precious advices, for customers...)


Optim - 25th January 2011  (12:14 GMT)

Hi Xperts and Pix,

I need to know about some Penalty time that we want to apply on certain Connections when they come from 3G to 2G . . . so that they don't go back to 3G instantly.



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