the internal time comes from the RF board sampling numbers
(each sample has a incremental number representing a very accurate timing)
raw incoming data is in buffer called "rxdata"
{: .func2}
### nr_fep_full()
"front end processing" of uplink signal
performs DFT on the signal
same function (duplicates): phy_procedures_gNB_common_RX()
it computes the buffer rxdataF (for frequency) from rxdata (samples over time)
{: .func3}
### gNB_top()
only compute frame numbre, slot number, ...
{: .func3}
### ocp_rxtx()
main processing for both UL and DL
all the context is in the passed structure UL_INFO
the context is not very clear: there is a mutex on it,
but not actual coherency (see below handle_nr_rach() assumes data is up-to-date)
The first part (in NR_UL_indication, uses the data computed by the lower part (phy_procedures_gNB_uespec_RX), but for the previous slot
Then, phy_procedures_gNB_uespec_RX will replace the data for the next run
The first part (in NR_UL_indication, uses the data computed by the lower part (phy_procedures_gNB_uespec_RX), but for the **previous** slot
Then, phy_procedures_gNB_uespec_RX will hereafter replace the data for the next run
This is very tricky and not thread safe at all.
{: .func3}
#### NR_UL_indication()
This block processes data already decoded and stored in structures behind UL_INFO
{: .func4}
* handle_nr_rach()
process data from RACH primary detection
if the input is a UE RACH detection
{: .func4}
* nr_schedule_msg2()
{: .func4}
* handle_nr_uci()
????
{: .func4}
* handle_nr_ulsch()
handles ulsch data prepared by nr_fill_indication()
{: .func4}
* gNB_dlsch_ulsch_scheduler ()
also calls "run_pdcp()", as this is not a autonomous thread, it needs to be called here to update traffic requests (DL) and to propagate waiting UL to upper layers
Calls schedule_nr_mib() that calls mac_rrc_nr_data_req() to fill MIB,
Calls each channel allocation: schedule SI, schedule_ul, schedule_dl, ...
this is a major entry for "phy-test" mode: in this mode, the allocation is fixed
all these channels goes to mac_rrc_nr_data_req() to get the data to transmit
{: .func4}
* NR_Schedule_response()
process as per the scheduler decided
{: .func4}
#### L1_nr_prach_procedures()
????
{: .func4}
#### phy_procedures_gNB_uespec_RX()
* nr_decode_pucch0()
actual CCH channel decoding
{: .func4}
* nr_rx_pusch()
{: .func4}
* extracts data from rxdataF (frequency transformed received data)
{: .func4}
* nr_pusch_channel_estimation()
{: .func4}
* nr_ulsch_extract_rbs_single()
{: .func4}
* nr_ulsch_scale_channel()
{: .func4}
* nr_ulsch_channel_level()
{: .func4}
* nr_ulsch_channel_compensation()
{: .func4}
* nr_ulsch_compute_llr()
this function creates the "likelyhood ratios"
{: .func4}
* nr_ulsch_procedures()
{: .func4}
* actual ULsch decoding
{: .func4}
* nr_ulsch_unscrambling()
{: .func4}
* nr_ulsch_decoding()
{: .func4}
* nr_fill_indication()
{: .func4}
populated the data for the next call to "NR_UL_indication()"
{: .func4}
#### phy_procedures_gNB_TX()
* nr_common_signal_procedures()
generate common signals
{: .func4}
* nr_generate_dci_top()
generate DCI: the scheduling informtion for each UE in both DL and UL
{: .func4}
* nr_generate_pdsch()
generate DL shared channel (user data)
{: .func4}
### nr_feptx_prec()
tx precoding
{: .func3}
### nr_feptx0
do the inverse DFT
{: .func3}
### tx_rf()
send radio signal samples to the RF board
the samples numbers are the future time for these samples emission on-air
