Add xran_queue_length atomic variable to count the number of messages in
oran_sync_fifo (as notifiedFIFO_t does not do this). Use this to
tolerate some double messages (e.g. excessive processing delay), but
start to skip if messages accumulate.
Prior to this change, "Detected double sync message" was printed each
time there was more than one message, which reflected the previous
behavior when using polling, but the gNB might catch up if it is only
once. The new logic ensure that we don't skip individual slots but do so
once messages start to accumulate.
In xRAN, it appears that T1a/Ta4 values are assumed to be within a TTI.
When T1a/Ta4 values with larger than a TTI are used, this causes two issues: (1) C-plane packets to be generated later than expected and (2) oai_xran_fh_rx_callback() receives the wrong timing information resulting in potentially empty/stale PUSCH/PRACH data to be read.
In this patch, we modify xRAN to make it handle large T1a/Ta4 values properly.
The changes include: (1) three additional variables in offset_num_slots_* (xran_dev.h), (2) modify "xran_timing_create_cbs" and "xran_timer_arm_for_deadline" (xran_cb_proc.c), and (3) revise "tx_cp_dl_cb" and "tx_cp_ul_cb" (xran_main.c).
Additionally, we add additional guard conditions to prevent xran_tx_proc.c from sending U-plane packets when it is not a downlink slot.
[FHI72] [xran F] Handle fragmented (un)compressed packets
In both E and F, the radio-transport fragmentation is not supported, and
all the "fragmented" (not seen as fragments in the xran, only as
sections) packets contain "E-bit" equal to 1. Per spec, the value 1 for
"E-bit" signifies the last fragment of one symbol. For more info, please
see "ecpriSeqid" section in the spec.
In E:
- nRBStart and nRBSize is updated according to the sent/received packet;
- max sections = 1;
- when a packet is fragmented, the xran uses memcpy(pos, iq_data_start,
size) function, and nothing is stored in start_prbu , num_prbu ,...
In F:
- nRBStart and nRBSize is only used for C-plane messages;
- nPrbElm represents the number of sections for DL only;
- based on the nPrbElm, each section contains UP_nRBStart and UP_nRBSize
parameters which represent the start and number of PRBs in one section
or one fragment;
- when a packet is fragmented, the xran uses nSecDesc and sec_desc to
extract the packet section content, and the data is stored in
start_prbu , num_prbu ,...
Previous work on the fragmentation in F:
- #884
- !3394 - only increases the XRAN_MAX_FRAGMENT from 4 to 6, since it was
only tested with BFP 8, but not end-to-end unfortunately. But this MR
fixes all the issues.
Tested with VVDN RU, 2x2, 16 bits, 100MHz, 30kHz, MTU <= 9216 B, and
Quectel UE RM520N-GL Revision: RM520NGLAAR03A03M4G.
The sufficient number of fragments needed for MTU 1500 and 8b compression is 6.
However, XRAN_MAX_FRAGMENT must be incremented by one (6+1 = 7).
In the MR https://gitlab.eurecom.fr/oai/openairinterface5g/-/merge_requests/3394, XRAN_MAX_FRAGMENT was increased to 6,
but the Tx data was actually copied 5 times, and unfortunately I haven't tested end-to-end back then.
This commit was successfully tested with Liteon FR1.
Even though the jumbo frame has 9600 bytes by the spec, the max MTU is limited to the MTU of a switch, if any used.
However, the value can be < max MTU of a switch.
This is very important for fragmentation purposes. If not properly set, the PDSCH packets will be missing.
semi-manual remove of not used #define commands
As i was upset to see all these #define with no code under, i made a
global pass to remove the obvious cases semi-manual remove of not used
bodies
manual script, then a lot of manual review
grep -IRs "#define" ../openair* ../common/* ../executables/ ../nfapi/ ../radio/ | \
fgrep -v '(' | fgrep -v '//' |awk '{print $2}' | egrep -v "#define *$n"| \
while read n ; do
grep -IRs $n ../openair* ../common/* ../executables/ ../nfapi/ ../radio/ | grep -v "#define *$n" | grep -q $n || echo $n;
done
will give a decent list of #define never used. Then, I think we should
keep lists of # define when it comes from standards, even if the code
doesn't use it right now
NR UE: add support for multiple RF frontends
This MR adds basic support for multiple RF-frontends at the UE.
There are multiple reasons why we might want this:
1. There might be different antennas needed for different bands (e.g. NTN or
TN antennas). These antennas might be connected to different RF-frontends.
In case of Handover, the UE needs to dynamically switch between these
RF-frontends.
2. Each rf-simulator connection carries baseband I/Q samples. To be able to
perform a handover between two cells at different frequencies, there must
be two rf-simulator connections, as the baseband channels should not
interfere and thus cannot simply be added.
3. When we want to support multiple UE simulation within one instance of
nr-uesoftmodem, and allow multiple cells and probably even handover between
these cells, we need either:
1. dedicated RF-frontends for each simulated UE, or
2. dedicated RF-frontends for each connected cell and dynamically assign
simulated UEs accordingly.
This MR implements what is needed for 1., 2. and 3.1.
Fix FFT size for xran_fh_tx_send_slot_BySymbol() and xran_fh_rx_read_slot_BySymbol()
This MR handles
- Fix FFT size for xran_fh_tx_send_slot_BySymbol() and
xran_fh_rx_read_slot_BySymbol() (!3809)
- Fix E release build
Even after this commit, we still have duplicated UL C-plane packets due to xran F release internal architecture.
Note: in E, all PRBs were in one section of one C-plane DL and UL. It is working even though the U-plane has "fragmented" packets.
Co-authored-by: Mario Joa-Ng <mario.joa-ng@openairinterface.com>
Previously, in F, only the following (subframe, slot, symbol) combinations were sent every frame:
(0, 0, 0)
(2, 1, 0)
(5, 0, 0)
(7, 1, 0)
Now, all the DL symbols are sent.
Notes:
In both E and F, the radio-transport fragmentation is not supported, and
all the "fragmented" (not seen as fragments in the xran, only as sections)
packets contain "E-bit" equal to 1.
Per spec, the value 1 for "E-bit" signifies the last fragment of one symbol.
For more info, please see "ecpriSeqid" section in the spec.
In E:
- nRBStart and nRBSize is updated according to the sent/received packet;
- max sections = 1.
In F:
- nRBStart and nRBSize is only used for C-plane messages;
- nPrbElm represents the number of sections for DL only;
- based on the nPrbElm, each section contains UP_nRBStart and UP_nRBSize parameters
which represent the start and number of PRBs in one section or one fragment.
Co-authored-by: Mario Joa-Ng <mario.joa-ng@openairinterface.com>
Update vrtsim timing job thread
List of changes:
- avoid calculating accumulated rounding error by calculating absolute
sample index based on CLOCK_REALTIME every time.
- use threadCreate instead of plain pthread_create which assigns a unique
thread name and simplifies debugging
Fix two issues regarding vrtsims taps client implementation:
- Incorrect #define used to enable taps socket handling
- flatbuffers package name changing between ubuntu versions
Support beam index for LiteON FR2 RU that needs per symbol section in CP packets
This branch supports beam index for LiteOn FR2 RU and others. It adds
the support of beam index for LiteOn RU that uses per-symbol CP packet
and is a sequel of MR !3605 (merged) that supports beam index for RU
that uses per-slot CP packets.
A. To support LiteOn FR2 RU, the following are needed.
a. Per symbol beamforming. Need separate section for each symbol on CP packet.
b. Handle these two bugs:
- section ID on UP packet is set wrongly to 13 for all sections
- prach eAxC offset starts from 0 instead of from last antenna port
number used by other channels.
B. Implementation
a. set fh_config->RunSlotPrbMapBySymbolEnable based on the setting in the configuration file
- if disable, the existing per-slot scheme is run on xran.
- if enable, RunSlotPrbMapBySymbolEnable mode is on in xran so that xran
will generate PrbElm per symbol (aka total of 14)and perform
per-symbol processing on the corresponding PrbElm.
b. set fh_config->LiteOnIgnoreUPSectionIdEnable based on the setting in
the configuration file if enable, handle 2 "features" of Liteon:
- To handle the section_id = 13 issue on Liteon where section ID is set
wrongly to 13 for all sections
- To handle the prach eAxC offset issue on Liteon where it starts from 0
instead of from the end of last antenna port number
c. if fh_config->RunSlotPrbMapBySymbolEnable, OAI FHI
- invoke xran_fh_rx_read_slot_BySymbol() instead of xran_fh_rx_read_slot()
- invoke xran_fh_tx_send_slot_BySymbol() instead of xran_fh_tx_send_slot()
C. Testing
a. Command to test benetel RU
sudo LD_LIBRARY_PATH=.:$DPDK_INST/lib/x86_64-linux-gnu/ ./nr-softmodem -O /etc/ran_development/CONFs/gnb.sa.band77.273prb.fhi72.4x4-benetel550_c0.conf --thread-pool 21,22,23,24,25,26,27,28
Results:
iperf UDP uplink
[ 5] 0.00-10.22 sec 87.3 MBytes 71.6 Mbits/sec 0.100 ms 370/63081 (0.59%) receiver
iperf UDP downlink
[ 5] 0.00-10.00 sec 796 MBytes 668 Mbits/sec 0.017 ms 1824/586404 (0.31%) receiver
b. Command to test LiteOn FR2 RU
sudo LD_LIBRARY_PATH=.:$DPDK_INST/lib/x86_64-linux-gnu/ ./nr-softmodem -O /etc/ran_development/CONFs/gnb.sa.band78.66prb.fhi72.2x2-liteon-F-Release.conf--thread-pool 21,22,23,24,25,26,27,28
Result:
iperf UDP uplink
[ 5] 0.00-10.20 sec 89.9 MBytes 73.9 Mbits/sec 0.156 ms 212/64848 (0.33%) receiver
iperf UDP downlink
[ 5] 0.00-10.00 sec 361 MBytes 303 Mbits/sec 0.077 ms 277662/542891 (51%) receiver
D. Difference between LiteOn FR2 E release configuration file and that for F release is
diff gnb.sa.band78.66prb.fhi72.2x2-liteon-KB.conf gnb.sa.band78.66prb.fhi72.2x2-liteon-F-Release.conf 39d38
< beam_weights = [1, 1];
225a225
> beam_weights = [1];
312c312,313
< mtu = 1500; # check if xran uses this properly
---
> #mtu = 1500; # check if xran uses this properly
> mtu = 9000; # check if xran uses this properly
313a315,316
> RunSlotPrbMapBySymbol = 1;
> LiteOnIgnoreUPSectionId = 1;
Add the F patch that work on both Benetel and LiteOn RU. support
fh_config parameters RunSlotPrbMapBySymbol and LiteOnIgnoreUPSectionId.
Change version number.
Make gpd config utility global
Make gpd a global utility macro for reading config/command line
parameters. Add a corresponding function with full name for clarity,
keep the short name for the macro for backward compatibility and ease of
use.
The main benefit of gpd/config_get_paramdef_from_name macro/function is
that it does not require maintaining a separate parameter index list.
List of changes:
- avoid calculating accumulated rounding error by calculating absolute
sample index based on CLOCK_REALTIME every time.
- use threadCreate instead of plain pthread_create which assigns a unique
thread name and simplifies debugging
Make gpd a global utility macro for reading config/command line parameters.
Add a corresponding function with full name for clarity, keep the short name
for the macro for backward compatibility and ease of use.
The main benefit of gpd/config_get_paramdef_from_name macro/function is that
it does not require maintaining a separate parameter index list.
Support prach with start symbol of PRACH not at symbol 0
The following PRACH indice have been tested.
index / format (nf mod x = y) / Subframe/ start_symbol /no_of_slot / occ / duration
152 B4 2 1 4,9 0 2 1 12
151 B4 2 1 4,9 2 1 1 12
157 B4 1 0 4 0 1 1 12
159 B4 1 0 9 0 1 1 12
Rfsimulator beam reception/transmission
A simplified beam switching simulation for rfsimulator. This works
mainly in 1 gNB - N UEs scenarios. This is not a real beamformer with
antenna, channel and propagation model. The way it works is that the
peers inform each other about the beams they transmit in, and on
reception before channel modelling, the beam data is combined based on
preconfigured rx_beam/tx_beam gain matrix.
Usage:
- Add --rfsimulator.enable_beams to enable beam simulation
- Add --rfsimulator.beam_gains .
Example list: 0,-5,-10
Resulting matrix:
[[0, -5, -10] [-5, 0, -5]] [-10, -5, 0]]
- Add --telnetsrv if you want to control the beams manually. The command
in telnet is "rfsimu setbeam <beam_map>", where beam_map is a uint64_t
controling the reception beam and transmission beam. If the
application is switching the beams automatically the beams will be
overwritten as soon as the application chooses to switch beams.
Supports up to 64 concurrent TX and RX beams.
Add CLI parameter rfsimulator.beam_ids which uses a list of beam ids instead of a
beam map. The beam map API is still present and can be used interchangably.
Add telnet command setbeamids which has similar semantics
Allow arbitrary order of beam ids in set_beams2 function. This
allows the application to select any arbitrary order of beam ids.
The underlying transport mechanism still uses beam_map so the beam_ids
are ordered before sending.
Also replaced tx_beam_map/rx_beam_map into beam_map.
Also fixed an issue where --rfsimulator.enable_beams required an argument.
Robert Schmidt