vrtsim: Optimize channel modelling
Optimization pass for channel modelling on transmission in vrtsim. This
comes from a requirement of O-RU to perform channel modelling with minimum
latency. The latency measured in O-RU 4TX 2RX on the UE is lowered from
~400 uS to ~100uS.
- Reduced MAX_CHANNEL_LENGTH to 200 and introduced SAVED_SAMPLES_LEN
- Refactored channel modelling actor allocation to parallelize work better
- Improved batching and task creation for channel modelling
- Replaced static global saved_samples with local static buffer in vrtsim_write_with_chanmod
Create a new CI pipeline for testing with vrtsim on Gracehopper:
https://jenkins-oai.eurecom.fr/job/RAN-VRT-Sim-Test-5G/
CFRA: mark RA complete when sending Msg2
The current contention-free random access forces a "Msg3" (which does
not exist in CFRA) to be received by a UE. Sometimes, this "Msg3" is not
received (for whatever reason), and the MAC declare that RA failed.
This is problematic, as the spec says that RA is complete once Msg2 is
received by the UE. Since the gNB cannot know when this is, simply mark
it as complete once we sent Msg2.
We still send Msg3 in CFRA, which is explained further in the commits.
Also, improve logging and stabilize an RFsim test by reducing sl_ahead.
Refactor DLSCH scheduler
Refactor the DLSCH post processor similarly to what has been done in
!3521 with the goal of saving an additional iteration through all UEs,
hopefully making the DLSCH scheduler faster.
It further includes changes to make working with and debugging multi-UE
operation easier:
- add some measurements in L1 (for total TX/RX time)
- a new option MACRLCs.[0].stats_max_ue to limit the number of UEs in
the periodic output (default: 8, 0=disable)
- avoid stack overflow in the MAC
- fix the writing of stats to nrMAC_stats.log and nrL1_stats.log when
the written output reduces by truncating the files
- avoid to schedule retransmission with 0 RBs.
Refactor PRACH handling at the gNB
- Remove race conditions by correctly setting mutexes
- Fix a bug when having multiple RACH occasions
- Reduce memory footprint by removing global memory, which should also
fix potential memory data races in FHI 7.2
- Additional fixes, see commit messages
a bit difficult to understand: sl_ahead=6 => we systematically miss the
rach detection in the scheduler because the scheduler runs more than 6
slots ahead the rx slot processing (here > 11 slots because 6 (DL and UL
slots) + 4 (RU_RX_SLOT_DEPTH, so UL only))
so, reducing sl_ahead works better than large sl_ahead because the idea
behind is: the scheduler of slot+sl_ahead will never create work to do
in a UL slot before slot+sl_ahead+X (as minimum k2 is X, in the 24PRB CI
test: 6)
The gNB will stop the periodical logging of UEs in MAC Info level after
a configurable number of UEs have been printed, by default 8.
Set it to 17 in some CI tests to ensure we still get all UEs for the
time being, as the CI might depend on this.
Improve handling of selection of RSRP/SINR report via configuration file
In current develop, the selection of SSB or CRI RSRP depends on the
do_CSIRS flag being activated. That's not wanted. CRI report for now it
is never handled, while we need SSB RSRP report for beam switching
regardless of CSI-RS configuration.
- Add XML pipeline for N2 handover testing
- Add Docker compose for two monolithic gNBs
- Features:
* Two monolithic gNBs (gNB1, gNB2) with proper CU+DU parameters
* Gradual attenuation control using RC4DAT attenuator (5s duration)
* N2 handover sequence: gNB1 → gNB2 → gNB1
* Proper channel mapping: ch1-2 for gNB1, ch3-4 for gNB2
* Telnet server configuration for CI commands
* Handover-specific neighbor configuration
* Clean test state management with attenuator reset
Update based on !3645
Note: For some test configurations we still need to provide
ra_ResponseWindow, for more details, check commit message of
41d14b571c
Integration 2025 week 42
* !3623 Optimization of PDSCH precoding operation
* !3691 \[CI\] Ensure multi-arch DockerHub Push after successful image build
* !3696 asn1c doesn't follow c99 variables alias rules, it needs to be compiled this...
* !3685 Assign antenna ports correctly for 1 and 2 layers for aerial.
* !3495 Type0 PDSCH frequency allocation at L1 UE
* !3686 Remove NR L2 simulator code from UE
* !3693 Remove B200-specific clock-rate setting
* !3701 OAI UE: add shared RSRP Table 10.1.6.1-1 mapping function to helpers and adopt it RRC UE
* !3662 RRC UE file cleanup
* update doc/README.md
* !3608 use common scale channel functions for DLSCH and ULSCH
* !3694 fix non initialized DMRS port value in case of DCI00 at UE
* !3702 Extend F1 rfsim CI test
* !3704 remove unused global queues, dead code
* !3673 CI: Aerial: Add an UL-heavy pipeline test
* !3651 CI: Upgrade HO setup to use an attenuator
* !3695 CI: Upgrade Aerial setup to 25-2.1
Update cuBB image to cubb-build:25-2.1_srs-ul-heavy (release 25-2.1 with
changes in the L1 config to test heavy ul)
Co-authored-by: Reem Bahsoun <reem.bahsoun@openairinterface.org>
Add OAIUE longrun pipeline
Add a new XML file for OAIUE longrun.
- Test description:
* 40 MHz BW, n78
* gNB with USRP N310, UE with USRP N310
* CN deployed on OC
- Test duration: 1 hour
- Test scenario: 3x DL 10 min test (20 Mbps) + 3x UL 10 min test (5
Mbps)
maki
Reem Bahsoun