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O-RAN 7.2 doc: explain layer mapping, streamline start gNB section

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Robert Schmidt
2024-02-09 11:49:47 +01:00
parent b612e5f021
commit 702c608ca1
1 changed files with 12 additions and 4 deletions
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doc/ORAN_FHI7.2_Tutorial.md
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@@ -622,17 +622,25 @@ Edit the sample OAI gNB configuration file and check following parameters:
* `eAxC_offset`: PRACH antenna offset * `eAxC_offset`: PRACH antenna offset
* `kbar`: the PRACH guard interval, provided in RU * `kbar`: the PRACH guard interval, provided in RU
xRAN SRS reception is not supported. The eAxC offsets for DL/UL are determined Layer mapping (eAxC offsets) happens as follows:
from the antenna configuration. - For PUSCH/PDSCH, the layers are mapped to `[0,1,...,N-1]` where `N` is the
respective RX/TX number of antennas.
- For PRACH, the layers are mapped to `[No,No+1,...No+N-1]` where No is the
`fhi_72.fh_config.[0].prach_config.eAxC_offset` and `N` the number of receive
antennas.
xRAN SRS reception is not supported.
# Start and Operation of OAI gNB # Start and Operation of OAI gNB
Run the `nr-softmodem` from the build directory:
```bash ```bash
cd ran_build/build cd ~/openairinterface5g/ran_build/build
sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/oran.fh.band78.fr1.273PRB.conf --sa --reorder-thread-disable 1 --thread-pool <list of non isolated cpus> sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/oran.fh.band78.fr1.273PRB.conf --sa --reorder-thread-disable 1 --thread-pool <list of non isolated cpus>
``` ```
You have to set the thread pool option to non-isolated CPUs, since the thread
pool is used for L1 processing which should not interfere with DPDK threads.
For example if you have two NUMA nodes in your system (for example 18 CPUs per For example if you have two NUMA nodes in your system (for example 18 CPUs per
socket) and odd cores are non-isolated, then you can put the thread-pool on socket) and odd cores are non-isolated, then you can put the thread-pool on
`1,3,5,7,9,11,13,15`. On the other hand, if you have one NUMA node, you can use `1,3,5,7,9,11,13,15`. On the other hand, if you have one NUMA node, you can use