NSA connection stability issue

[Paloma-96]

Issue Description

After establishing an NSA connection correctly and being able to ping Google and start a download using curl from srsUE, the connection breaks after a few seconds/min.

Setup Details

The testbed consists of 2 Ettus X310 with UBX160 spaced about 1 meter apart, 5G multiband dipole antennas, OS Ubuntu 18.04 and UHD 4.2. NR MCS fixed at 5/10 to increase stability, TX and RX gain fixed at 20.

Expected Behavior

Communication should remain stable

Actual Behaviour

---------Signal-----------|-----------------DL-----------------|-----------UL----------- rat pci rsrp pl cfo | mcs snr iter brate bler ta_us | mcs buff brate bler lte 1 -49 49 2.6k | 0 22 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.8k | 5 15 1.0 1.9M 0% 0.0 | 5 1.4k 128k 36% lte 1 -49 49 2.7k | 0 23 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.8k | 5 15 1.0 2.0M 0% 0.0 | 5 1.8k 113k 36% lte 1 -49 49 2.7k | 0 24 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.8k | 5 15 1.0 2.4M 0% 0.0 | 5 2.2k 133k 34% lte 1 -49 49 2.7k | 0 24 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.8k | 5 15 1.0 2.8M 0% 0.0 | 5 7.4k 241k 44% lte 1 -49 49 2.7k | 0 24 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.9k | 5 15 1.0 2.5M 0% 0.0 | 5 4.9k 266k 42% lte 1 -49 49 2.7k | 0 24 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.9k | 5 15 1.0 2.8M 0% 0.0 | 5 5.9k 282k 45% lte 1 -49 49 2.7k | 0 24 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 0 0 1.9k | 5 15 1.0 3.0M 0% 0.0 | 5 0.0 476k 41% 2023-10-16T12:50:46.432169 [PHY0-NR] [W] [ 1150] PBCH-MIB: CRC failed 2023-10-16T12:50:46.442230 [PHY0-NR] [W] [ 1160] PBCH-MIB: CRC failed 2023-10-16T12:50:46.452107 [PHY0-NR] [W] [ 1170] PBCH-MIB: CRC failed 2023-10-16T12:50:46.462145 [PHY0-NR] [W] [ 1180] PBCH-MIB: CRC failed 2023-10-16T12:50:46.472183 [PHY0-NR] [W] [ 1190] PBCH-MIB: CRC failed 2023-10-16T12:50:46.482227 [PHY0-NR] [W] [ 1200] PBCH-MIB: CRC failed 2023-10-16T12:50:46.488197 [PHY ] [W] [ 1206] SYNC: Out-of-sync detected in PSS/SSS 2023-10-16T12:50:46.489232 [PHY ] [W] [ 1207] SYNC: Out-of-sync detected in PSS/SSS 2023-10-16T12:50:46.490256 [PHY ] [W] [ 1208] SYNC: Out-of-sync detected in PSS/SSS 2023-10-16T12:50:46.491325 [PHY ] [W] [ 1209] SYNC: Out-of-sync detected in PSS/SSS RF status: O=0, U=1, L=0 lte 1 -54 54 2.6k | 0 18 0.0 0.0 0% 1.0 | 0 0.0 0.0 0% nr 500 -1 0 2.3k | 5 14 1.0 3.0M 0% 0.0 | 5 2.4k 106k 80% RF status: O=0, U=1, L=0 lte 1 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 0.0 -nan 0% nr 500 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 2.4k -nan 0% lte 1 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 0.0 -nan 0% nr 500 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 2.4k -nan 0% lte 1 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 0.0 -nan 0% nr 500 0 0 0.0 | 0 0 0.0 -nan 0% 0.0 | 0 2.4k -nan 0%

Additional Information

When this happens, the channel response shown by the srsue GUI shows abrupt changes, essentially collapses for a few moments and the NR constellation becomes much less defined, after few "drops" the communication stops.

Is it possible to plot also NR channel in srsenb?