FAQ

ARA Portal

  1. Unable to ping/SSH to the container from ARA jumpbox

    Reason: The security group rules of your project is blocking the ICMP and SSH traffic.

    Solution: Go to the security groups page via Project -> Network -> Security Groups on the dashboard. Click on the Manage Rules button of the default security group. In the redirected page, you can see the existing security group rules. You need to add two rules with the following attributes:

    Rule 1

    • Rule: All ICMP

    • Description: Optional

    • Direction: Ingress

    • Remote: CIDR

    • CIDR: 0.0.0.0/0

    Rule 2

    • Rule: SSH

    • Description: Optional

    • Remote: CIDR

    • CIDR: 0.0.0.0/0

  2. Unable to create container

    Reason: The Docker daemon may face some issues while downloading the image from the Docker Hub due to any kind of network disruptions in the wireless management channel. This error may occur at UE sites deployed at remote locations. The status of container may show as Error.

    Solution: Delete the existing container and create a new container. Note that the container with error will be deleted automatically on an error.

AraRAN

  1. Permission denied while running gNB or UE

    Reason: The Docker container does not have permission to access the SDR.

    Solution: Stop (no need to delete the container) the respective container from the Project -> Containers page and start the container again. In case, restarting the container does not help, you can delete and create the container again.

  2. Crash/core dump in the nr-softmodem command

    Solution: Re-run the nr-softmodem command. It may happen that you may need to run the command 2-3 times.

  3. UE not connecting to gNB

    Reason: When the UE starts, it searches for the signals from the BS and begins a procedure to attach. The procedure takes a few seconds, especially when the UE is far away from the BS.

    Solution: In case the UE is not getting connected to the gNB after executing the command nr-softmodem (Step 12 of Experiment 6 of AraRAN experiments) for 30 seconds, we suggest to stop the command (using Ctrl+C) and run it again. It may happen that you need to run a few times to get the UE connected to the BS.

  4. Skylark Key Error during Measurements

    Reason: AraMIMO measurements scripts runs into Key Error issue when collecting data. The Skylark application does not return the control from the call to the data through the object client and the script keeps listening for return data.

    Solution: Stop the script with CTRL + C and rerun the script. If it keeps running into this issue, reduce the number of iterations e.g. 10 or 15 or 30.