[srslte-users] Multiple UEs to eNB

[Nikos Apostolakis]

Hi,

I am new to the srsLTE community. I am trying to enable a scenario using
the ZeroMQ driver between multiple UEs and one eNB.

>From previous emails, I have seen that this will be supported in upcoming
releases (facilitating ZMQ broker caps) and for the time being, I may use
GNU Radio Companion.

I have created a second ue2.conf configuration, so that USIM info matches
this by the HSS. In addition, I have used the same EARFCN across UEs and
the single cell of the eNB.

I have seen the app notes for the Inter-cell handover and I have modified
this as following:

*------------------------------------------------------------------*
| *Port Direction | cell 1 Port # |   UE1   |   UE2   |*
*------------------------------------------------------------------*
*|          TX           |        2101       |  2001   |  2003   |*
*-------------------------------------------------------------------*
*|          RX           |        2100       |  2000   |  2002   |*
*-------------------------------------------------------------------*

The Tx Port of the Cell 1 is directed to both UE1, UE2 RX Ports
The Tx Port of the UEs are separately throttled, jointly added and then
directed to the Cell 1 Rx Port.

I start the epc, enb, ue1, ue2 and then the gnu radio script.

What I notice, is that sometimes the UE1 successfully registers while other
times it pauses in the RRC Connected state.
However, the UE2 never successfully registers (Network authentication
failure). I have to notice, in this point, that if I try to connect the UE2
on its own to the EPC, it successfully registers (so, it's not the USIM
data).

Is the configuration of the UEs that I should take care of or something in
the GNU script? Has anyone else experienced similar behavior?

Thanks in advance for your time,

Nikos Apostolakis
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