[srslte-users] srsRAN UE with OAI 5G

[knopp]

Hi Diarmuid,

I think we'd have to either run the eNB with the T tracer and get the 
log or add a hexdump of the NR UE capabilities. The asn1 decoder for the 
LTE UECapabilityInformation containing the 5G container is failing. This 
has only been tested with a (limited) set of Commercial NSA UEs and an 
even more limited set of NSA/SA UEs.

This is the first message with a 5G container coming from the UE. Do you 
have a hexdump on the UE side of what is sent? Otherwise, we can help 
you activate the necessary logs in the eNB to get the hexdump and then 
we can use an online ASN1 decoder to check what could be wrong. When the 
decoding of the LTE message passes, the 5G OCTET_STRING component of the 
message gets sent to the gNB and this we can see with wireshark or in 
the text logs of the gNB, but unless until overall 4G message is decoded 
we can't see any of the 5G information.

It's already a good sign that the first LTE UECapabilityInformation was 
decoded with the necessary R15 information elements and that the 5G 
measurement reports came in :-)

Raymond
On 21/05/2021 13:35, Diarmuid Collins wrote:
> Hi OAI/srsRAN Community
> Has anybody had any success connecting srsRAN UE - NR (B210) to OAI gNB 
> (USRP B210).
> 
> This is supported by an enb (USRP b210), and OAI 5G ENDC NSA core.
> 
> eNB handover to gNB logs fails saying (logs attached):
> 
> [SCTP] Successfully sent 61 bytes on stream 1 for assoc_id 16
> 
> [RRC] [FRAME 00000][eNB][MOD 00][RNTI 5011] received 
> ueCapabilityInformation on UL-DCCH 1 from UE
> 
> [RRC] got UE capabilities for UE 5011
> 
> *[RRC] [FRAME 00000][eNB][MOD 00][RNTI 5011] Failed to decode nr UE 
> capabilities (0 bytes)*
> 
> *
> *
> 
> *
> *
> 
> Note, the srsRAN RN-UE will connect no problem to the standalone ENB 
> with OAI 5G ENDC NSA core [log also attached].
> 
> 
> Diarmuid
> 
> -------------------------------------------------------------------
> Diarmuid Collins PhD
> Iris Testbed Manager,
> CONNECT Centre for Future Networks,
> Dunlop Oriel House,
> Trinity College,
> Dublin 2, Ireland
> E: dcollin5 at tcd.ie <mailto:dcollin5 at tcd.ie>
> W:https://connectcentre.ie/people/diarmuid-collins/ 
> <https://connectcentre.ie/people/diarmuid-collins/>