Requested NSSAI from UE not found
Opened this issue · 7 comments
I tried to replicated your sample, and it was success, but as wireshark trace, i can't find the Requested NSSAI from gnodeB, but only allowed NSSAI from AMF to gnodeB at NGAP Initial Context Setup Request message message
I attached the pcap capture at Control Plane Node.
https://1drv.ms/u/s!AraARB5vdTNrhrgDZNsQ8Kk5Z3F1wA?e=dzBl2Q
Could you help me to clarify?
Hi @giangdh1009
If you are using UERANSIM, I think that UERANSIM probably don't send Requested NSSAI.
In this case, I think that the NSSAI value registered in the UDM was used as default and sent from the 5GC to the UE as Allowed NSSAI.
Sorry if my guess is wrong.
Actually i tried your instrucstion, which was success, UE with config at UERANSIM with sst: 1 sd: 1 go to UPF1, and sst: 1 sd: 2 go to UPF2, in UDM i provisioned both two slices which sst: 1 and sd: 1 default. Does your project trace have UERANSIM send Requested NSSAI.?
When I checked my pcaps, the NGAP/NAS-5GS InitialUEMessage, Registration request did not include the Requested NSSAI. On the other hand, the AMF -> UE NGAP/NAS-5GS InitialContextSetupRequest contained the appropriate Allowed NSSAI for the cases of [SST:1, SD:0x000001] and [SST:1, SD:0x000002] respectively. (My UDM defaults to [SST:1, SD:0x000001].)
This also happened in the following scenario with free5GC+UERANSIM.
https://github.com/s5uishida/free5gc_ueransim_snssai_upf_sample_config
Yes, it's the same for me, So my question here is how AMF know to send the appropriate Allowed NSSAI on NGAP/NAS-5GS InitialContextSetupRequest ?
I would like to know it, too!
Yeah, just think your scenario sample so you should know, i will try to investigate more, thanks for your support