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.
- Added first beam optimization to combine_tx_buffers.
- Added first beam & first peer optimization to rfsimulator_read_internal
This results in significant speed up for the first rx beam, first tx
beam and first peer which is the base case with beam simulation disabled.
In rfsim, received packets are dynamically allocated and freed when no longer
needed, which is dependent on the channel model, packet timestamp and packet
size (number of samples carried).
This commit fixes the packet age check for channels with nonzero channel offset
(most notalby NTN channels).
Also present:
- extract the NTN satellite position update code to a separate function and
call it once per trx_read call instead of once per rx beam.
Add a set of macros with designated initializers to simplify using
paramdef_t arrays in C++ source code. Fix clang error with
RFSIMULATOR_PARAMS_DESC using mixed designated and non-designated
initializers.
- Received packets are dynamically allocated and kept in a
queue for as long as they are needed.
- The layout of the packets was changed from interleaved antennas
to non-interleaved antennas.
- Generate a contiguous buffer from saved packets as needed.
There is extra work caused by this change due to recv() call no
longer saving data directly into the circular buffer, however further
processing is easier due to contiguous nature of the tx antenna buffers
prepared. The impact on performance was not measured.
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 <comma separated Toepliz form matrix of gains in dB>.
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.
Co-authored-by: Laurent Thomas <laurent.thomas@open-cells.com>
Bartosz Podrygajlo