[srslte-users] Request for information on handoff support in srsLTE

[Francisco Paisana]

Our srsUE already supports handover. Its signal strength measurement
configuration is set by the RRCConnectionReconfiguration message. So, if
you need to extract neighbour cells' signal strength, you could add the
cells you need to the measCfg in the eNB
RRCConnectionReconfiguration message.

Making the actual S1 handover is much more complicated though. If you don't
really mind extra latencies, you could just force the UE to establish a new
cell selection and RRC connection once it finds a stronger target cell.

Another issue you have to pay attention to is having the source and target
cells well aligned in frequency. The way UEs perform signal strength
measurement of neighbour cells assumes good inter-cell frequency
synchronization. This can be achieved with an external clock reference
(e.g. ettus octoclock).

Regards,
Francisco

On Thu, Jun 20, 2019 at 4:43 PM Soumyadeep Datta <dsoumyadeep97 at gmail.com>
wrote:

> Hi Francisco,
>
> Thank you for your reply.
>
> I need to implement handoff dynamically, for example, in a mobility
> situation where a UE moves from one BS's coverage region to another.
>
> To be able to do that in real time, I need a way to retrieve the received
> signal strength or some other parameter which will help me decide in favour
> of one BS over the other and thereafter implement the handoff.
>
> Yours sincerely,
> Soumyadeep Datta.
>
>
> On Thu 20 Jun, 2019, 5:00 AM Francisco Paisana, <
> francisco.paisana at softwareradiosystems.com> wrote:
>
>> Hey Soumyadeep,
>>
>> Our eNB does not yet support S1 handover. Regarding your second question,
>> do you want to set the UE's cell dynamically or just at startup?
>>
>> Regards,
>> Francisco
>>
>> On Thu, Jun 20, 2019 at 9:04 AM Soumyadeep Datta <dsoumyadeep97 at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I am a new user of srsLTE platform. I wanted to know if the srsLTE stack
>>> has support for handoff/mobility in the ePC/Core network. If not, is there
>>> a provision to manually control the eNB to which the UE attaches? (I was
>>> considering retrieving some suitable parameter, for instance, received
>>> signal strength, to achieve this.)
>>>
>>> Yours sincerely,
>>> Soumyadeep Datta
>>> Final year Dual Degree student,
>>> Department of Electrical Engineering,
>>> IIT Kanpur.
>>> _______________________________________________
>>> srslte-users mailing list
>>> srslte-users at lists.softwareradiosystems.com
>>> http://www.softwareradiosystems.com/mailman/listinfo/srslte-users
>>>
>>
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