NB-IoT setup using ZMQ error

[ahmedelbushra]

Issue Description

I tried to detect the cell of enb using (cell_search_nbiot, and npdsch_ue) within the zmq environment, the issue that I am facing is that cell_search_nbiot and npdsch_ue detect the wrong cell (cell ID) and the graph I am getting from srsGUI makes no sense. how can I get the expect graph and cell ID. The cell expected to be found should be (CELL ID = 1) but it detect (CELL ID = 39)

Setup Details

step 1: run epc ( sudo ./srsepc/src/srsepc). step 2: run enb ( ./srsenb/src/srsenb --rf.device_name=zmq --rf.device_args="fail_on_disconnect=true,tx_port=tcp://:2000,rx_port=tcp://localhost:2001,id=enb,base_srate=23.04e6" ) step 3 : run cell search ( ./cell_search_nbiot -b 7 -a "tx_port=tcp://:2001,rx_port=tcp://localhost:2000,id=ue,base_srate=23.04e6" ) The cell search found the cell in 2626.3 MHz.

step 4 : run npdsh_ue ( *sudo ./npdsch_ue -f 2626.3e6 -I zmq -a "tx_port=tcp://:2001,rx_port=tcp://localhost:2000,id=ue,base_srate=23.04e6"**) file:///home/system0/Pictures/Screenshots/Screenshot%20from%202024-03-08%2020-58-40.png

Expected Behavior

My expectation is to get something similar to https://docs.srsran.com/projects/4g/en/latest/app_notes/source/nbiot/source/index.html

[andrepuschmann]

Hey, what you're trying to do will not work. The NB-IoT examples aren't compatible with the LTE eNodeB. Only npdsche_enodeb and npdsch_ue will work together. You can also use the cell search example to find commercial NB-IoT cells. Hope that helps.

[ahmedelbushra]

I tried to npdsche_enodeb using zmq, and receive it.

The setup :

step 1 : run"*./npdsch_enodeb -f 868e6 -O zmq -a "tx_port=tcp://:2000,rx_port=tcp://localhost:2001**"

step 2 : run "*./npdsch_ue -f 868e6 -r 0x1234 -s -I zmq -a "tx_port=tcp://:2001,rx_port=tcp://localhost:2000**""

THE EXPECTED OUTPUT:

THE ACTUAL BEHAVIOR :