Neighboring femtocells

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Neels Hofmeyr nhofmeyr at sysmocom.de
Thu Feb 7 14:43:08 UTC 2019


On Thu, Feb 07, 2019 at 03:39:29PM +0200, Mykola Shchetinin wrote:
> Dear Osmocom community,
> 
> Does somebody have experience using multiple 3G femtocells connected to a single
> HNBGW? Do cell reselection and handover work properly? How did you configure it?
> 
> Also, Osmocom (or Syscmocom?) used 3G networks at Congress 35c3. Were you using
> multiple femtocells?
> 
> Were they connected to the same HNBGW? How did you configure them for cell
> reselection and handover to work smoothly?

35c3 GSM team used multiple femto cells, but handover requires MSC
interaction (inter-"BSC" or inter-RAT handover procedures) which I am only
just adding to osmo-msc now, in the course of inter-MSC handover support.

So we simply attached N nano3G to a single hnbgw and the msc, and did not
support 3G handover.

Once we might support that: I'm not sure how to tell a nano3G about
neighbors, nor am I sure about 3G handover procedures. I know though that
the RTP is forwarded femto <-> MSC, so *something* needs to switch it.

Cell reselection should work AFAICT, though I didn't test for that
specifically. What I did see working well on 35c3 is that a phone for
which the CN disallowed 3G access camped over to 2G and vice versa.

~N

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