Spectrum model exception during handovers

[lu...@online.de]

Dear all,

I am performing simulations with the lte module  on ns3.31 where I  perform hand over multipe UEs between a set of eNbs. 

For most of my scenarios this works as expected and without any error.

Nevertheless, I found a scenario where a handover leads to an exception of the spectrum model:  

assert failed. cond="m_spectrumModel == x.m_spectrumModel", +11.101214285s 4 file=../src/spectrum/model/spectrum-value.cc, line=203

A somewhat related issue with the wifi module was discussed here (https://groups.google.com/g/ns-3-users/c/Ih8Hgs2qgeg) and identified as a bug.

I assume that the receiving spectrum model has to be reseted in my case, too.

I would be grateful for any ideas how to solve this issue (e.g. where/how to reset the spectrum model).

PS: Please see the attachment for a small example script illustrating the error.

The output of the example program on my system is as follow:

+5.10521s /NodeList/6/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 3: successful handover to CellId 1 with RNTI 6

+5.25521s /NodeList/9/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 6: successful handover to CellId 2 with RNTI 6

+5.40521s /NodeList/12/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 9: successful handover to CellId 1 with RNTI 7

+5.55521s /NodeList/15/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 12: successful handover to CellId 2 with RNTI 7

+5.70521s /NodeList/18/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 15: successful handover to CellId 1 with RNTI 8

+9.05521s /NodeList/5/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 2: successful handover to CellId 1 with RNTI 9

+9.20521s /NodeList/8/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 5: successful handover to CellId 1 with RNTI 10

+9.25521s /NodeList/9/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 6: successful handover to CellId 1 with RNTI 11

+9.35521s /NodeList/11/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 8: successful handover to CellId 1 with RNTI 12

+9.50521s /NodeList/14/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 11: successful handover to CellId 1 with RNTI 13

+9.55521s /NodeList/15/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 12: successful handover to CellId 1 with RNTI 14

+9.65521s /NodeList/17/DeviceList/0/LteUeRrc/HandoverEndOk UE IMSI 14: successful handover to CellId 1 with RNTI 15

assert failed. cond="m_spectrumModel == x.m_spectrumModel", +11.101214285s 4 file=../src/spectrum/model/spectrum-value.cc, line=203

terminate called without an active exception

[Tom Henderson]

Thanks for reporting this; I just created issue 447 to track it:

https://gitlab.com/nsnam/ns-3-dev/-/issues/447

- Tom