[srslte-users] mme receives invalid QoS combination from srsenb/srsue

[alexander.serkin at gmail.com]

Dear colleagues

I upgraded to 21.04 with some issue I can't figure out. I use
srsue<zeromq>srsenb<>third party MME topology.

And it worked for me previously on 20.10. But now after attach accept
message of the following contents (10.20.1.4 - srsenb, 10.20.1.6 - MME):

 

Tuesday May 25 2021

<<<<OUTBOUND  From sessmgr:4 mme_msg_utils.c:9427 (Callid 00e53c8f)
16:13:20:235 Eventid:153002(3)

NAS Tx PDU, from 10.20.1.6:36412 to 10.20.1.4:41950 (80)

 

Non Access Stratum (NAS) (80 bytes)

       NAS_MSG_SECURITY_HDR_INTEGRITY_PROTECTED_CIPHERED(0x2)

         MAC = 0x48658704 

         NAS Count = 0x2

  EPS Mobility Management

    Protocol Discriminator

       EPS MOBILITY MANAGEMENT MESSAGES(0x7)

    Security Header Type

       NAS_MSG_SECURITY_HDR_PLAIN_NAS_MSG(0x0)

    Message Type

       ATTACH_ACCEPT(0x42)

    Result

       EPS ONLY(0x1)

    Spare-Half

      (0x0)

    T3412

      (0x1e)

    TAI

        TRACKING AREA LIST

        Type: 1  Length: 1

          ELEMENT 0: MNC[02] MCC[250] TAC[1]

    ESM Container

      EPS Session Management

        Protocol Discriminator

           EPS SESSION MANAGEMENT MESSAGES(0x2)

        EPS Bearer Id

          (0x5)

        Transaction Id

          (0x1)

        Message Type

           ACTIVATE_DFLT_BEARER_REQUEST(0xc1)

        EPS QoS

            QCI=7 

        APN

            gis.mnc002.mcc250.gprs 

        PDN Address

            PDN Address (IPv4 10.20.1.28))

        APN-AMBR

            DN-LNK-APN-AMBR= 256000 kbps (0xfe 0xfa)

            UP-LNK-APN-AMBR= 256000 kbps (0xfe 0xfa)

    EPS Mobile Identity

        GUTI

          PLMN

            (250:02)

          MME GROUP ID

            (0x8100)

          MME CODE

            (0x80)

          M-TMSI

            (0xc0000604)

    T3423

      (0x49)

    Equivalent PLMN List

        PLMN

          (250:02)

 

I'm getting "Invalid QoS Combination"  S1ap Radio Network Layer Cause in the
answer to initial context setup. 

What has changed, and how I can fix that minor problem?

 

Thank you!

Alex

-------------- next part --------------
A non-text attachment was scrubbed...
Name: winmail.dat
Type: application/ms-tnef
Size: 5638 bytes
Desc: not available
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20210525/4745e78d/attachment.bin>