[srslte-users] UE Measurement reports and X2 Handover

[Francisco Paisana]

Hey Sudheesh,

The eNB will support intra-eNB and S1 Handover in the incoming release.
Unfortunately, X2 Handover won't be available yet, but we are happy to
accept contributions.

For contributions, I would recommend that you first read:
https://github.com/srsLTE/srsLTE/wiki/Licensing-and-contributions

Kind Regards,
Francisco


On Wed, Oct 21, 2020 at 12:56 AM Sudheesh Singanamalla <
sudheesh at cs.washington.edu> wrote:

> Hi Francisco and the srsLTE community,
>
> I am trying to bump up this older thread to see if srsenb now supports X2
> handover? I would love to know if there is an experimental branch or a fork
> where active work for X2 support might be happening. My colleagues and I
> would love to help out and contribute to the project feature by joining an
> active work in progress or help test out any existing code aimed at
> implementing X2.
>
> Thanks,
> Sudheesh
>
> On Fri, Apr 17, 2020 at 2:36 AM Francisco Paisana <
> francisco.paisana at softwareradiosystems.com> wrote:
>
>> 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
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
>>
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