common/utils/threadPool/measurement_display.c:55:14 warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=]
N2 handover
This MR introduces full support for N2 handover, covering handover
decision, preparation, execution, and notification between source and
target NG-RAN nodes.
Key features:
1. Handover Decision & Preparation:
- Implement N2 handover decision based on UE measurement reports.
- Generate the Handover Preparation Information message, including
RRCReconfiguration.
- Send Handover Required message from the source NG-RAN to the AMF.
2. Handover Execution:
- Decode and handle the Handover Request on the target NG-RAN.
- Process the Handover Command on the source gNB, triggering
RRCReconfiguration.
- Initiate Handover Notify after successful completion.
3 NGAP & RRC Enhancements:
- Implement NGAP encoding/decoding functions for Handover Required,
Handover Request, Handover Command, Handover Failure, and Handover
Notify (3GPP TS 38.413).
- Adds NG-RAN Status Transfer support (UL/DL) for PDCP COUNT
preservation during mobility:
- support for NGAP Uplink and Downlink RAN Status Transfer messages
(TS 38.413 §9.2.3.13-14) to enable proper PDCP COUNT value
transfer during handover or recovery: NGAP encoding/decoding for
RAN Status Transfer, PDCP helpers to extract and apply COUNT (HFN
+ SN) per DRB. This aligns with TS 38.300 §9.2.3.2.1 and TS 23.502
§4.9.1.3.3, ensuring PDCP status preservation in AM.
4. Testing:
- Introduce a Telnet command to manually trigger N2 handover using UE
ID and neighbor PCI.
- Add configuration file for testing N2 handover with a target gNB.
* the command gets in input the neighbour PCI and the UE ID
* the telnet ci function to retrieve the UE context was extended in the process
* add function to trigger handover on the same gNB for testing purposes
Co-authored-by: batuhan duyuler <batuhan.duyuler@firecell.io>
RFSim test for 10 UEs/process
This MR adds a testcase and changes required to run 10 UEs in a single
process with RFSim
- Added deregistration for all connected UEs
- Refactored MAC/RRC instance handling
- made map_current_symbol thread safe
- made opeanir0_cfg thread safe and local
- Added 10UE/process testcase
Some code in T tracers is used by both LTE and NR.
In LTE, we expect 10 subframes per frame, and the logging is done with
this assumption. We have one tick per subframe.
In NR, we deal with slots, not subframes. And we have n ticks per frame
(depending on mu). As of today, only n=20 is tested (corresponding to
mu=1).
A previous commit introduced 'subframes_per_frame' which had the correct
meaning for LTE but was truly 'slots per frame' for NR. This creates
confusion.
Let's replace 'subframe' by 'tick' to reduce confusion.
- Use MAX_NUM_NR_UE_INST in NR UE MAC to control number of MAC instances.
- Modify the MAC interface slightly so that nr_l2_init_ue only initializes one instance
RF emulator and improvements of the timers
RF emulator:
Add an RF library emulating a real device without the need of a real
device. This is thought to enable using phy-test without requiring a
radio device or channel simulation. The library synchronizes on the
real time clock, drops TX and generate noise on RX. Noise generation
can be disabled and the noise level configured.
Timers improvements:
- Fix standard deviation for merged timers
- Add display of ULSCH decoding timers
- Add decoding timer in AAL
Taps client for vrtsim
The MR allows vrtsim to connect to the Raytracing Channel Emulator (CE later).
https://gitlab.eurecom.fr/oai/raytracing-channel-emulator
Additional Ubuntu packages required:
- libnanomsg-dev
- flatbuffers-compiler
- libflatbuffers-dev
Everything was tested on the same host. Follow the steps below to
successfully replicate:
1. Build nr-softmodem dependencies
2. Build nr-softmodem for (gNB, nrUE) with OAI_VRTSIM_TAPS_CLIENTset to ON.
3. Start the core network (Optional) follow this tutorial
4. Start the gNB
sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --device.name vrtsim --vrtsim.role server --vrtsim.timescale 0.5 --vrtsim.taps-socket ipc:///tmp/ru_socket_0
5. Start the nrUE
sudo ./nr-uesoftmodem -C 3619200000 -r 106 --numerology 1 --ssb 516 --band 78 --device.name vrtsim --vrtsim.taps-socket ipc:///tmp/ue_socket_0
6. Start the CE Server, once the UE and gNB are running properly, so the
server can connect to IPC sockets
7. Start CE client; the binaries can be downloaded from a pipeline run
or from this link
8. Move the UE in the CE client to generate a new taps array and
populate the taps in softmodems
Move the channel state management outside the channel implementation.
This simplifies the channel implementation but forces users of the
channel to manage it's state manually.
Add handling for error states in vrtsim which allows to close the
softmodems with CTRL+C without hanging, improving user experience
- Client detection of stale timer.
- Abort state for client and server
Think: NR with different number of slots per frame depending on mu.
The name 'subframes_per_frame' is a bit ambiguous. It is valid for LTE,
but for NR it should be 'slots_per_frame'.
For example, for sub-carrier spacing of 30KHz, we have 20 slots per
frame, so in this case subframes_per_frame = 20. In reality whatever
the numerology, there is always 10 subframes per frame in NR.
But how to name this variable which is used both for LTE and NR cases?
'subframes_or_slots_per_frame'? It's a bit long and also ambiguous.
Conclusion: no big deal I think. 'subframes_per_frame' and so be it.
- Allow client to exit cleanly if server is down
- Ensure timing_thread is joined only once avoiding exit_function loop
- Free noise_device
- Save previously sent samples for channel modelling
The CI fails sometimes, because some processes/threads are created in
unpredictable order and if the client connects before the server is
ready some tests fail, as seen in the following log:
[UTIL] client/server iq-samples: launch sub-processes
[UTIL] threadCreate() for time client: creating thread (no affinity, default priority)
[UTIL] time manager configuration: [time source: server] [mode: client] [server IP: 127.0.0.1} [server port: 7374]
[UTIL] time client: connection to 127.0.0.1:7374 failed, try again in 1s
[UTIL] threadCreate() for time source iq samples: creating thread (no affinity, default priority)
[UTIL] threadCreate() for time server: creating thread (no affinity, default priority)
[UTIL] time manager configuration: [time source: iq_samples] [mode: server] [server IP: 127.0.0.1} [server port: 7374]
[UTIL] client/server: rlc ticks: 1000 pdcp ticks: 1000 x2ap ticks: 1000
CMDLINE: "/oai-ran/build/common/utils/time_manager/tests/test_time_manager_auto" "--time_management.mode" "server" "--time_management.time_source" "iq_samples"
[UTIL] client/server: rlc ticks: 0 pdcp ticks: 0 x2ap ticks: 0
CMDLINE: "/oai-ran/build/common/utils/time_manager/tests/test_time_manager_auto" "--time_management.mode" "client"
[UTIL] client-server iq-samples: ERROR
The client/server iq-samples test is started.
Then we see this log:
[UTIL] time manager configuration: [time source: server] [mode: client] [server IP: 127.0.0.1} [server port: 7374]
Which means that the client is running.
It tries to connect to the server (not running yet), but fails, so sleeps
for 1 second before attempting another connection to the server:
[UTIL] time client: connection to 127.0.0.1:7374 failed, try again in 1s
The sleep is done by the time_client thread, the main thread of the test
program continues and does a sleep(1).
Then the server arrives:
[UTIL] time manager configuration: [time source: iq_samples] [mode: server] [server IP: 127.0.0.1} [server port: 7374]
It sends all the ticks (to no client, since the client is still sleeping).
Then the test is over, the sleep(1) of the client finishes and the program
exits. The client never connected to the server.
We have this log:
[UTIL] client/server: rlc ticks: 0 pdcp ticks: 0 x2ap ticks: 0
And the test fails.
It's complicated to write an automatic test involving several uncoordinated
programs. The operating system may create processes in any order. We use
some sleeping to wait, but it may be too short or too long, leading to test
failure.
Let's see with more sleep if the CI fails less.
Add a CU-UP load tester and improve GTP performance
This adds a simple tester program for the CU-UP. It sets up a number of
UEs/bearers in the CU-UP via the E1 interface, then streams data in
downlink/uplink (as seen by the CU-UP). More information is available in
tests/nr-cuup/README.md.
Includes some fixes to properly verify that SCTP is installed, and use
"the right cmake way" to use it in cmake code (see commit for details).
simplify and make more local variables in nr_rx_pdcch() and fix small bugs...
simplify and make more local variables in nr_rx_pdcch() and fix small bugs
(size 9 RE instaed of 12 RE)
T hacks: add new tracer ant0 and a tool to plot ofdm data from usrp or rfsim
(output or input)
The tool ant0 dumps IQ data to a file (or stdout) as float complex or short.
It is needed for a student's project. (Well, we could use record/extract, but
it's simpler.) The tool ofdm-plot is used to plot output or input signal from
gnb in the frequency domain. May be useful to debug, why not.
Fix Dedicated BWPs
- Improve SearchSpace selection
- Improve CORESET selection
- Fix fill 'initialDownlinkBWP->pdsch_Config' when there are
DedicatedBWPs
* This fixes the reported 'RSRP = 0' issue when the UE is in the
InitialBWP and we have DedicatedBWPs configured
- Add a 'common' type SearchSpace in the NR_BWP_DownlinkDedicated IE for
DedicatedBWPs
- Fix hardcoded 'controlResourceSetId' by making it dynamic
- Remove 'searchspaceid' from 'verify_agg_levels' function because it
was used only for LOG
- CI: Add DedicatedBWP to '40 MHz TDD F1+E1 SA' in
'RAN-SA-B200-Module-SABOX-Container'
Synchronized Real-Time Data Recording Application Addition
The main Features of Synchronized Real-Time Data Recording Application:
- The Data Recording Application runs in parallel to the gNB or UE
server or in another server as Data Recording or Data Lake Server
- It makes use of (an extended version) of OAI’s T-tracer framework
- It communicates with base station, and user terminal
- It synchronizes and combines data traces and control information
(meta-data) from Base station and User terminal into consistent SigMF
data sets
Details on implementation addition:
- T_tracer Extension to Support up to 35 Parameters in the T() macro
- Add traces on gNB PHY UL and related requirement: FD PUSH IQ, FD DMRS, and UL Channel estimates wi/wo interpolation, and Rx Payload bits:
1. The required memories have been created and initialized in:
openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c
2. Those memories: memory for DMRS signals, memory for channel
estimates based on DMRS positions, memory to store slot grid with
channel coefficients based on DMRS positions after interpolation,
and memory to store extracted data including PUSCH + DMRS.
3. The input parameters to nr_pusch_channel_estimation() has been
updated to get the pointer to the added memories of
pusch_dmrs_slot_mem and pusch_ch_est_dmrs_pos_slot_mem
(openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h)
4. The DMRS grid of NR slot and the estimated channel coefficients at
DMRS locations are logged to created memories in:
openair1/PHY/NR_ESTIMATION/nr_ul_channel_estimation.c
5. The function inner_rx in
openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c is updated to log
the extracted ULSCH PRBs and the interpolated channel coefficients.
6. The T-macro() has been called in
(openair1/PHY/NR_TRANSPORT/nr_ulsch_demodulation.c) to trace added
traces: T_GNB_PHY_UL_FD_DMRS, T_GNB_PHY_UL_FD_CHAN_EST_DMRS_POS,
T_GNB_PHY_UL_FD_PUSCH_IQ, T_GNB_PHY_UL_FD_CHAN_EST_DMRS_INTERPL
- Add traces on UE PHY UL and related requirement: Tx Scrambled bits and Tx payload bits
1. Update input parameters to nr_ulsch_encoding () in
nr_transport_proto_ue.h to get number_dmrs_symbols to be added to
meta-data.
2. In nr_ulsch_coding.c: Trace UE PHY UL Payload TX bits (T_message:
T_UE_PHY_UL_PAYLOAD_TX_BITS) including related meta-data and UTC
time.
3. In nr_ulsch_ue.c: Trace UE PHY UL Scrambled TX bits (T_message:
T_UE_PHY_UL_SCRAMBLED_TX_BITS) including related meta-data and UTC
time.
4. Fix the input prameters in nr_ulsch_encoding () called in
(openair1/SIMULATION/NR_PHY/ulschsim.c) since a new input parameter
has been added.
- Add Data Collection Services (T-Tracers for gNB and UE)
1. Add _tracer_app_gnb and t_tracer_app_ue apps to common/utils/T/tracer/Makefile
2. Add Data collection Service for gNB: common/utils/T/tracer/t_tracer_app_gnb.c
3. Add Data Collection Service for UE: common/utils/T/tracer/t_tracer_app_ue.c
- Add Shared memory configuration
(common/utils/T/tracer/shared_memory_config.h), since we will have too
much memory consumption on the stack if the T-tracer is not fast
enough to process the traces or if we have too much traces. As a
result, tracers start to capture data, write data in shared memory,
then close the T-Tracer after getting the recording of N slots. The
Data recording App will read data from the shared memory.
- Add Main app of Data Recording Application v1.0 including: Config
files, SigMF Interface, Config Interface, Sync Service, and def
messages: The data recording App includes mainly the following files:
1. The main app: data_recording_app_v1.0.py that has the data control
service, interact with tracers, data sync and conversion service.
2. The configuration file:
common/utils/data_recording/config/config_data_recording.json
3. The wireless dictionary file:
common/utils/data_recording/config/wireless_link_parameter_map.yaml
4. Config Interface
(common/utils/data_recording/lib/config_interface.py) that reads
the configuration for both gNB and UE.
5. Sync interface (common/utils/data_recording/lib/sync_service.py)
that sync captured data for gNB and UE before saving them in SigMF
format
6. The SigMF Interface
(common/utils/data_recording/lib/sigmf_interface.py) to store
recorded data and meta-data in SigMF format
7. A simple script
(common/utils/data_recording/sync_validation_demo.py) to validate
that the recorded bits from gNB and UE are in Sync
- For more info look to doc/data_recording.md
The data recording App includes the following files:
- The main app: data_recording_app_v1.0.py that has the data control service, interact with tracers, and data sync and conversion service
- The configuration file: common/utils/data_recording/config/config_data_recording.json
- The wireless dictionary file: common/utils/data_recording/config/wireless_link_parameter_map.yaml
- The SigMF Interface (common/utils/data_recording/lib/sigmf_interface.py) to store recorded data and meta-data in SigMF format
- A simple script (common/utils/data_recording/sync_validation_demo.py) to validate that the recorded bits from gNB and UE are in Sync
- For more info look to doc/data_recording.md
A squashed commit further updates:
- Enhance Data Recording App structure
- Support the new state machine of T-Tracers
- Add new files for Config Interface, sync Service, def of data recording messages, and common utilties
- Make part of logging on Terminal configurable
- Add _tracer_app_gnb and t_tracer_app_ue apps to common/utils/T/tracer/Makefile
- Add Data collection Service for gNB: common/utils/T/tracer/t_tracer_app_gnb.c
- Add Data Collection Service for UE: common/utils/T/tracer/t_tracer_app_ue.c
- Add Shared memory configuration (common/utils/T/tracer/shared_memory_config.h),
since We will have too much memory consumption on the stack if the
T-tracer is not fast enough to process the traces or if we have too
much traces. As a result, tracers start to capture data, write data in
shared memory, then close the T-Tracer after getting the recording of
N slots
- Support the operation of : COnfig, Record, and Stop
- Poll from Socket and not use get_events to mitigate long-time waiting
if there is no data in buffer or the UE is already released or crashed
- Add extra offset to improve data sync
Measurement gaps
Scheduling measurement gaps to provide sufficient time for the UE to
re-tune its transceiver to the target carrier, complete the set of
measurements and then re-tune its transceiver back to the original
carrier.
Robert Schmidt