How can I create a star topology to deal with X2 interface?

[VICTOR HUGO LAZARO LOPES]

Hello folks.

I am looking for a topology for LTE/5G where the BSs can use X2 interfaces (for CoMP services). But, as I want to explore topology with high density, I don't think the mesh X2 topology is the best design.

So, I thought I must use a router (as a hub/switch) with one connection for each BS, but it doesn't work.

I got this error:

std::out_of_range: map::at -- in module (LteCompManagerProportional) MultiCell_X2Star.eNodeB1.cellularNic.compManager (id=268), at t=0.001s, event #64

Can someone help me out, please?

Regards.

[GIOVANNI NARDINI]

Hello,

could you share your configuration (NED + INI) so that we could try to understand what the problem is?

[VICTOR HUGO LAZARO LOPES]

Hello Mr. Giovanni.

I am just trying to use the same example from simuLTE:

https://raw.githubusercontent.com/inet-framework/simulte/master/simulations/networks/MultiCell_X2Star.ned

But considering an NR scenario with more than 2 gNBs, like the example attached.

Running I got a error:

NRTxPdcpEntity::deliverPdcpPdu - the destination is not a UE but Dual Connectivity is not enabled. -- in module (NRPdcpRrcEnb) MultiCell_Standalone_X2Star.gnb1.cellularNic.pdcpRrc (id=299), at t=0s, event #111

Regards.

--
You received this message because you are subscribed to a topic in the Google Groups "OMNeT++ Users" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/omnetpp/AwmMpFk8svA/unsubscribe.
To unsubscribe from this group and all its topics, send an email to omnetpp+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/omnetpp/bd98277e-871d-4a79-bf34-491885256297n%40googlegroups.com.

[Giovanni Nardini]

Hello,

the problem is due to the automatic route assignment done by the INET's IPv4NetworkConfigurator. In fact, it turns out that the configurator selects the wireless interface as the "best route" for packets going from one gNB to the other, instead of using the route through the router.

I was able to run your configuration by manually modifying the route assignment. In particular, I used the following configuration in the "demo.xml" file (the one used by the configurator to assign IP addresses and route):

Note that you need to use the actual IP addresses of the gNBs and the router. Take a look at the INET documentation for more information about those settings: https://inet.omnetpp.org/docs/tutorials/configurator/doc/index.html

Best regards.

Giovanni

[VICTOR HUGO LAZARO LOPES]

Thank you very much.

Worked perfectly.

Best regards.
Victor Hugo.