[alcatelman]

Hello Pix,
i have tried yoour proposition and everything seems ok now.
But i just observed that more channel requests are going to the GSM band. I increased CRO for the DCS concentris cell to 14dB without improvement.
GSM CRO for neighbour cells are at 0dB.
Pls advice. This started after the Concentric cell implementation.

[pix]

hi,

could you confirm your cell topology ?

you have, for each sector:
1 GSM cell “standalone” (cell type = single ?)
1 DCS cell “concentric” (cell type = single concentric ?)

am i correct ?

why did you implement monoband concentric DCS cell ? don’t you have enough DCS frequencies already ?

i’m not very convinced by your topology, please explain..

to increase normal assignment in the DCS, yes, the idea would be to increase the CRO. Ensure the C2 criteria is enabled in your DCS cell (param_reselect_ind).
With a cro=14dB you should have a nice balance between gsm and dcs. Could you please share your qos stats?

Regards
pix

[alcatel man]

Hello pix,
i just checked the NPO and discovered that Penalty Time was set to 31(infinity). I think this could be the cause since:
If penalty time is not infinity,
C2=C1+CRO-TO
else if PT=infinity,
C2= C1-CRO

Cell is currently under monitoring.
Thanks

[pix]

yes, you are right.

Set the penalty time to 40s, in order to use C2 = C1 + CRO -TO

that would push a lot more traffic in DCS cell, for sure !

good job 🙂
pix

[alcatel man]

Thanks a great deal for the support

[External Interference]

Hello Pix,
I am haveing uplink interference in a GSM cell on both the fixed frequency TRX and hopping TRX. I suspect external interference. I’ve installed band pass filters without success. Pls advice, it’s really causing problems with customer.

[pix]

hi,

what are the stats for Idle Band measurements, per TRX?

if it is external interference located in the UL GSM band, the only way to properly fix it is to scan the area, fond which frequencies are impacted and what is the source.
Then shut it down.

The cowardly way is to find clean frequencies, knowing that the problem might be on all frequencies or that it can randomly appear anywhere.

Cheers
pix

[alcatel man]

thanks pix

[alcatel man]

Hello,

After swap from Is it possible to experience issues on 3G2G HO success rate as per NPO KPI point of view, while on user experience everything is ok. I think mayb it is because the SGSN never releases the pdp on 3G after HO.
Pls advise

[shailendra]

why we cannt define 2g to 3G handover.

[Amatigue]

I have some problem on my Atcatel Utran: some mobile like blackberry don’t make a resection 2G/3G. please help me !

[push traffic to 3G]

push traffic to 3G

[Author]

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