[srslte-users] UE Measurement reports and X2 Handover

[Francisco Paisana]

Hey Sudheesh,

Yes, your understanding is correct. The eNB is still lacking handover, but
we plan to have it this year. However, intra-eNB and S1 Handover will be
implemented first.

The measurements you are observing are likely just for the serving cell,
unless your RRCConnectionReconfiguration Message contains a MeasConfig
field. You can activate neighbour cell measurements by setting "ho_active"
to true in the cell_list in the rr.conf file. This will likely enable you
to see the UE making MeasReports of the neighbour cells. Not much else will
happen though considering that the rest of the handover implementation is
still missing.

Regards,
Francisco

On Fri, Apr 17, 2020 at 9:26 AM Sudheesh Singanamalla <
sudheesh at cs.washington.edu> wrote:

> Hi srsLTE Community,
>
> We are running experiments and trying to understand X2 Handover between
> the eNBs. However, looking through the changelog, we noticed that the
> handover implementation is currently on the UEs and not on the eNBs. Is our
> understanding correct?
>
> In the experiment setup, we have 3 USRP B200Mini SDRs, 2 of them working
> as the eNB and one behaving as the UE. Logging the pcap from the UEs, we
> see the LTE_RRC DL_DCCH RRCConnectionReconfiguration messages and some
> measurements with the log messages printing "MEAS: New measurement earfcn="
> but however don't see the X2 messages or the UE handing over to a new eNB.
>
> The UE which performs the measurement reports however does not report
> these messages to the eNB. Is there a separate configuration which allows
> that to happen?
>
> Are we doing something wrong here? Would it be possible for the community
> members to share an example pcap with X2 and showing how UEs report to the
> eNB with the measurement reports, so that we can understand where we might
> be making any errors?
>
> Thanks,
> Sudheesh Singanamalla
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