One of my device under 5G coverage does not stay in SA and falls back to NSA while the other device stays in SA, what can be the reason ? or can I consider the first device has some issues.
Note : Both the devices are at same location, same coverage and same PCI.
It means either Ue did not complete registration in SA or may be one of the PDU session is rejected so gNB would have released the Ue from SA NW. Once it reads the MIB/SIB of LTE and if can complete TAU then it will go to NSA. But wondering if it’s in NSA and Ue is in SA mode then eNB should trigger back the Ue to SA/NSA nw, based on the timer you have set in the node. either blind RWR or measurement based HO should trigger, check eNB settings as well . Please lock Ue to SA mode only and check whether all the registration process is complete or not .