Re-attach to gNB

[Tiago Sousa]

Hello guys,

I created a scenario where my UE has mobility and cannot re-attach to the gNB  after lose the connection, even when the UE returns to the positon of the gNB. 

Despite getting the SINR overtime, i cannot transfer data...

Do you have a hint in how can i overcome this situacion, and restore the link?

[Kent Huns]

Hello Tiago

From what I understand, the process of attach (nrHelper->AttachToEnb) is completed once before the simulation starts(Simurator::Run()).

I've never seen the example of re-attach or initial access(gNB searches unconnected UE and attach to it) during simulation time.

But, one thing I'm stuck on, was there any process of disconnection in ns-3/5G-LENA?

Once a gNB-UE pair was attached, I think they would keep sending packets even if their SINR is extremely low.

I have a feeling that there is some other cause, such as packet generation has stopped.

Best regards,

Kent

[Gabriel Ferreira]

Right now, Radio Link Failure (RLF), cell scanning, etc is not supported. I'm working on that, but we have no timelines for that.
There are a lot of RRC, MAC and PHY changes, plus calibrating parameters to make all of this work correctly.

[Kent Huns]

Thank you for the reply, Gabriel.

Please continue your schedule. I will not request them.

I think it's quite difficult to change topology in simulation time due to the concept of ns-3.

[Tiago Sousa]

Thank you for the reply, 

I will try to keep the UE walking around the area,  without exit of the gNB.

Keep the good work!!