Lte Ue switch from CONNECTED_NORMALLY to IDLE_CAMPED_NORMALLY

[Marios Me]

Hi guys ,

I have an lte scenario in ns-3 3.21 in which I have one enb and one UE which is CONNECTED_NORMALLY to the enb.
In this scenario I want also to schedule an event that will switch the state of the UE from CONNECTED_NORMALLY
to IDLE_CAMPED_NORMALLY after 5 seconds of simulation and then connect back again to the same enb !
When I'm trying to do it straight forward by calling the LteUeRrc::SwitchState I was getting an assert !!

I'm newbie to ns3 , so every idea is welcomed !!

[Tommaso Pecorella]

Hi,

it's not really a ns-3 issue, it's more a C++ problem: do not use directly private functions. You should only rely on public functions, if things are private there's (usually) a good reason.

I'd suggets to check LteUeRrc::GetAsSapProvider (). The object retuned have a method (public) named Disconnect (). From the looks of it, it does what you want: disconnects the UE.

Hope this helps,

T.

[Marios Me]

Hi,

Thank you for your advice ! I have tried it but nothing happens !! I mean I have made callback to supervise the state changes and when the handler (which contains the lteUeRrc->GetAsSapProvider()->Disconnect() ) is being called , there is no state change , so I suppose that it doesn't work or am I doing something extemely wrong ?!

Thank you in advace

Marios

[Tommaso Pecorella]

Hi,

no idea. Use a debugger and try to figure out. If you think you found a bug, please contact the late module maintainers.

Cheers,

T.

[Michele Polese]

Hi Tommaso,

maybe I am missing something. I am trying as like as Marios to switch UEs states, in order to have an UE that is connected only when it has to TX something and not always. 

I took a look at the documentation and to the source code and I cannot find the implementation of the Disconnect() method you mentioned. The lte-as-sap.cc is a stub file. Is it implemented in a subclass which I didn't find? 

Thank you for your attention,

Michele

[Tommaso Pecorella]

Hi,

it's a template function, and it's in the header...

It "simply" calls the right DoDisconnect. In the UE case it should be LteUeRrc::DoDisconnect ().

T.

[Michele Polese]

Thank you very much for the reply. Indeed it calls LteUeRrc::DoDisconnect (), but it appears that the state is always IDLE_START. 

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