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

[Francisco Paisana]

Hey Alexander,

Either you disable the guaranteed bitrates request in the MME S1AP message,
or in the rrc_bearer_cfg.cc, you disable the check if the QoS is supported.
For the latter, I think it should be sufficient to comment out these lines:

if (req_bitrate > pbr) {
  logger->warning("Provided E-RAB id=%d QoS not supported (guaranteed
bitrates)", erab_id);
  cause.set_radio_network().value =
asn1::s1ap::cause_radio_network_opts::invalid_qos_combination;
  return SRSRAN_ERROR;
}

Regards,
Francisco

On Tue, May 25, 2021 at 2:43 PM <alexander.serkin at gmail.com> wrote:

> 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
>
> _______________________________________________
> srslte-users mailing list
> srslte-users at lists.softwareradiosystems.com
> https://lists.softwareradiosystems.com/mailman/listinfo/srslte-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.srsran.com/pipermail/srsran-users/attachments/20210525/3cf1fdc9/attachment.htm>