You should see "UE State = RRC_RECONFIGURED" in the eNodeB's log screen when the attach procedure completes. usr/local/src/openairinterface5g/SCRIPTS/run_oaisim_enb_ue.sh On node-0, run the simulated UE and eNodeB:.In order to "see" the control plane exchange between the eNodeB and the MME you might run tshark on the S1_MME interface. To make sure, attach to the HSS screen, i.e., " screen -r hss", and wait for the HSS state changes to 'STATE_WAITCEA' -> 'STATE_OPEN'. Before moving to the next step, we need to make sure MME and HSS are ready to allow connections from the eNB.You can attach to see the output of a screen by: screen -r After running this script, by typing screen -ls and you can see mme_sgw and hss screens are running.usr/local/src/openair-cn/SCRIPTS/run_epc_hss_local The profile is set up so that node-0 runs eNodeB/UE and node-1 runs MME/SPGW/HSS. The exeriment will have 2 nodes: node-0 and node-1. As such you will need to access the nodes using the "SSH command" option on the "List View" tab (rather than the "console tab" option.) You will need several ssh terminals on your experiment nodes. Once the experiment is ready, you can click on "List View" to see the ssh instruction to access to your nodes. (Note that your experiment name should not contain an underscore "_".) Click "Instantiate" to instantiate a new experiment using this profile. Navigate to the "Start Experiment" page and search for the " OAI_SIM_S" profile. Instantiate a new experiment using OAI profile in PhantomNet: The S1_U, S1_MME logical interfaces run on the LAN link between the two machines. The public interface on node-1 is used as the PGW's SGi interface for Internet access. The HSS is a separate executable communicates with MME via S6a interface. Note that MME and SPGW is a single executable in OAI, they communicate with each other via ITTI queue. S1_MME interface is the control interface for exchanging S1AP signaling messages with MME, S1_U is data plane interface for data packets. The eNodeB has two interfaces to MME and SPGW. Applications on Node-0 (UE/eNodeB node) send data to the radio stack of the UE/eNB via a local virtual interface (i.e, oip1). UE and eNodeB are simulated - they run the same radio protocol stack as in real hardware SDR, but with simulated physical layer between UE and eNodeB (i.e, simulated fading models, path loss etc). Simulated eNodeB and UE run on node-0 and MME/SPGW/HSS run on node-1. Logical components and interfaces in this tutorial setup.įigure 1 shows the components and interfaces between them in our setup.