[srslte-users] S1 handover

[Philipp Schach]

Hey,

I would also like to try an S1 handover. My setup includes two PCs and two B210. PC1 is EPC (Open5GS) and eNodeB (srsRAN) with one B210. The second PC is my 2nd eNodeB with 2nd B210. As COTS UE I use a Nexus 5x. The setup is currently working now, but without handover. Has anyone tried this setup before? Are there any specific things to consider here? Or can I follow the instructions in docs for S1 Handover? I will see if I can find a GPS for synchronization.

Regards,
Philipp

> Am 10.06.2021 um 13:57 schrieb Francisco Paisana <francisco at srs.io>:
> 
> Hey,
> 
> Using the same clock source for both eNBs is helpful to avoid that any frequency offset affects the UE cell measurements. This is the sort of synchronization that is hard to achieve via network signaling. So, I would definitely suggest using a GPS or external device as a reference.
> 
> I never experimented with handover between B210 and LimeSDR, so I would be interested in hearing about your results. At the moment, I don't see any reason why it wouldn't work.
> 
> Regards,
> Francisco
> 
> On Wed, Jun 9, 2021 at 8:23 PM Modyngs <mobilebackup95 at gmail.com <mailto:mobilebackup95 at gmail.com>> wrote:
> Thanks for the replay
> 
> Can we also use B210 as master eNB and limesdr as slave eNB to do s1 handover?
> 
> Also I think they should be sync to each other! If yes do we need some GPS signal or some external device to be placed in order to Handover between two eNBs while using COTS UE, or they will sync using EPC signals?
> 
> 
> P.S : I'm gonna use 3 PCs. One for EPC, one for master eNB using B210 and the other slave eNB using limesdr. COTS would be a samsung S series!
> 
> Is this setup theoretically work?
> 
> Thanks
> Best regards
> 
> On Wed, 9 Jun 2021, 01:07 Francisco Paisana, <francisco at srs.io <mailto:francisco at srs.io>> wrote:
> Hey,
> 
> The S1 and intra-eNB handover should work with COTS UEs. For the S1 Handover, you will need two RF front-ends to run as source and target enbs. We support both intra-frequency and inter-frequency handover. For the latter, you will have to set up the measurement gap period in the rr.conf file.
> 
> Regards,
> Francisco
> 
> On Tue, Jun 8, 2021 at 8:21 PM Modyngs <mobilebackup95 at gmail.com <mailto:mobilebackup95 at gmail.com>> wrote:
> 
> 
> Hi, I was reading the Handover application Note of SRS docs.
> 
> Saw that the S1 Handover needs ZMQ( GRC Broker) to manage the gain and Handover procedure
> 
> 
> But is it possible not to use the ZMQ when you are testing with COTS UE?
> 
> I can confirm that the procedure works with srsUE and GRC together, So can we just omit the srsUE & GRC and replace them with real UE and test the S1 Handover without the GRC BROKER?
> 
> Thanks
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