OMEC 5G NSA DCNR - ISSUE REPORT

[Luis Enrique Ulloa Barriga]

Dears,

 

Currently we are facing an issue with OMEC Core, we are using the omec-control-plane-0.7.2 version and here the list of images tags using to deploy it:

 

tags:

    init: docker.io/omecproject/pod-init:1.0.0

    hssdb: registry.aetherproject.org/proxy/omecproject/c3po-hssdb:master-9a5f565

    hss: registry.aetherproject.org/proxy/omecproject/c3po-hss:master-9a5f565

    mme: registry.aetherproject.org/proxy/omecproject/nucleus:master-c0d9143

    spgwc: registry.aetherproject.org/omecproject/spgw:master-6aad2f2

    pcrf: registry.aetherproject.org/proxy/omecproject/c3po-pcrf:pcrf-b29af70

    pcrfdb: registry.aetherproject.org/proxy/omecproject/c3po-pcrfdb:pcrf-b29af70

    config4g: registry.aetherproject.org/omecproject/5gc-webui:onf-release3.0.5-bf0b54f

    depCheck: quay.io/stackanetes/kubernetes-entrypoint:v0.3.1

 

During 3x Dual connectivity Attach test we obtained a Malformed package from MME instead of Security mode command as bellow image show.

 

On Attach Request message UE sends the mandatory IEs according to standard to support 5G NSA 3x attach:

• DCNR bit enabled on UE Network Capability
• UE Additional security capability IE

For this Attach procedure, we tried it using differents types: EPS Only and Combined attach, but for all obtained the same malformed package as result.
After check the s1ap container logs we found that it reports an error, we think is related to the size of message, and checking the repository code we think the issue happens on some hardcoded lines in secreq_processing function that finally sends the malformed message by sctp.

 

So, please your support to check:

1. Why this malformed package is sent by MME? Is this OMEC control plane version supporting 5G NSA?
2. Do we need perform some additional configurations on OMEC Core?

 

Expected Behavior
MME should send the Security mode command message to eNodeB and it should include Replayed additional security capabilities IE.

 

Find attached the .pcap file (attach procedure) and logs for s1ap, s6a and mme services.

 

Best regards,

 

 

 

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[Ajay Thakur]

Thanks Luis for your bug report. This omec version supports 5G NSA. We have identified a couple of issues. We are fixing the same.

Thank You for your patience. We shall revert to you as soon as possible.

Thank You

Ajay

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