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openairinterface5g/executables/nr-ue.c
Thomas Schlichter 62fe88d6f4 NR UE: make sure not to lose N_TA when updating N_common_TA_adj + N_UE_TA_adj 
Separate timing_advance (N_TA) from timing_advance_ntn (N_common_TA_adj + N_UE_TA_adj)
to keep N_TA when updating N_common_TA_adj + N_UE_TA_adj.

Fixes #981
2025-11-19 10:05:45 +01:00

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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.0 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
#define _GNU_SOURCE // For pthread_setname_np
#include <pthread.h>
#include <openair1/PHY/impl_defs_top.h>
#include "executables/nr-uesoftmodem.h"
#include "PHY/phy_extern_nr_ue.h"
#include "PHY/INIT/nr_phy_init.h"
#include "NR_MAC_UE/mac_proto.h"
#include "RRC/NR_UE/rrc_proto.h"
#include "RRC/NR_UE/L2_interface_ue.h"
#include "SCHED_NR_UE/defs.h"
#include "PHY/NR_UE_TRANSPORT/nr_transport_proto_ue.h"
#include "executables/softmodem-common.h"
#include "radio/COMMON/common_lib.h"
#include "LAYER2/nr_pdcp/nr_pdcp_oai_api.h"
#include "LAYER2/nr_rlc/nr_rlc_oai_api.h"
#include "openair1/PHY/TOOLS/phy_scope_interface.h"
#include "instrumentation.h"
#include "common/utils/threadPool/notified_fifo.h"
#include "position_interface.h"
#include "nr_phy_common.h"
#include "common/utils/time_manager/time_manager.h"
#include "log.h"
/*
* NR SLOT PROCESSING SEQUENCE
*
* Processing occurs with following steps for connected mode:
*
* - Rx samples for a slot are received,
* - PDCCH processing (including DCI extraction for downlink and uplink),
* - PDSCH processing (including transport blocks decoding),
* - PUCCH/PUSCH (transmission of acknowledgements, CSI, ... or data).
*
* Time between reception of the slot and related transmission depends on UE processing performance.
* It is defined by the value NR_UE_CAPABILITY_SLOT_RX_TO_TX.
*
* In NR, network gives the duration between Rx slot and Tx slot in the DCI:
* - for reception of a PDSCH and its associated acknowledgment slot (with a PUCCH or a PUSCH),
* - for reception of an uplink grant and its associated PUSCH slot.
*
* So duration between reception and it associated transmission depends on its transmission slot given in the DCI.
* NR_UE_CAPABILITY_SLOT_RX_TO_TX means the minimum duration but higher duration can be given by the network because UE can support it.
*
* Slot k
* -------+------------+--------
* Frame | Tx samples |
* Subframe | buffer |
* Slot n -------+------------+--------
* ------ +------------+-------- |
* | Rx samples | |
* | buffer | |
* -------+------------+-------- |
* | |
* V |
* +------------+ |
* | PDCCH | |
* | processing | |
* +------------+ |
* | | |
* | v |
* | +------------+ |
* | | PDSCH | |
* | | processing | decoding result |
* | +------------+ -> ACK/NACK of PDSCH |
* | | |
* | v |
* | +-------------+------------+ |
* | | PUCCH/PUSCH | Tx samples | |
* | | processing | transfer | |
* | +-------------+------------+ |
* | |
* |/___________________________________________________________\|
* \ duration between reception and associated transmission /
*
* Remark: processing is done slot by slot, it can be distribute on different threads which are executed in parallel.
* This is an architecture optimization in order to cope with real time constraints.
* By example, for LTE, subframe processing is spread over 4 different threads.
*
*/
static void start_process_slot_tx(void* arg) {
notifiedFIFO_elt_t *newTx = arg;
nr_rxtx_thread_data_t *curMsgTx = NotifiedFifoData(newTx);
int num_ul_actors = get_nrUE_params()->num_ul_actors;
if (num_ul_actors > 0) {
pushNotifiedFIFO(&curMsgTx->UE->ul_actors[curMsgTx->proc.nr_slot_tx % num_ul_actors].fifo, newTx);
} else {
newTx->processingFunc(curMsgTx);
}
}
static size_t dump_L1_UE_meas_stats(PHY_VARS_NR_UE *ue, char *output, size_t max_len)
{
const char *begin = output;
const char *end = output + max_len;
for (int i = 0; i < MAX_CPU_STAT_TYPE; i++) {
output += print_meas_log(&ue->phy_cpu_stats.cpu_time_stats[i],
ue->phy_cpu_stats.cpu_time_stats[i].meas_name,
NULL,
NULL,
output,
end - output);
}
return output - begin;
}
static void *nrL1_UE_stats_thread(void *param)
{
PHY_VARS_NR_UE *ue = (PHY_VARS_NR_UE *) param;
const int max_len = 16384;
char output[max_len];
char filename[30];
snprintf(filename, 29, "nrL1_UE_stats-%d.log", ue->Mod_id);
filename[29] = 0;
FILE *fd = fopen(filename, "w");
AssertFatal(fd != NULL, "Cannot open %s\n", filename);
while (!oai_exit) {
sleep(1);
const int len = dump_L1_UE_meas_stats(ue, output, max_len);
AssertFatal(len < max_len, "exceeded length\n");
fwrite(output, len + 1, 1, fd); // + 1 for terminating NULL byte
fflush(fd);
fseek(fd, 0, SEEK_SET);
}
fclose(fd);
return NULL;
}
static int determine_N_TA_offset(PHY_VARS_NR_UE *ue) {
if (ue->sl_mode == 2)
return 0;
else {
int N_TA_offset = ue->nrUE_config.cell_config.N_TA_offset;
if (N_TA_offset == -1) {
return set_default_nta_offset(ue->frame_parms.freq_range, ue->frame_parms.samples_per_subframe);
} else {
// Return N_TA_offet in samples, as described in 38.211 4.1 and 4.3.1
// T_c[s] = 1/(Δf_max x N_f) = 1 / (480 * 1000 * 4096)
// N_TA_offset[s] = N_TA_offset x T_c
// N_TA_offset[samples] = samples_per_second x N_TA_offset[s]
// N_TA_offset[samples] = N_TA_offset x samples_per_subframe x 1000 x T_c
return (N_TA_offset * ue->frame_parms.samples_per_subframe) / (4096 * 480);
}
}
}
void init_nr_ue_vars(PHY_VARS_NR_UE *ue, uint8_t UE_id)
{
int nb_connected_gNB = 1;
ue->Mod_id = UE_id;
ue->if_inst = nr_ue_if_module_init(UE_id);
ue->dci_thres = 0;
ue->target_Nid_cell = -1;
ue->ntn_config_message = CALLOC(1, sizeof(*ue->ntn_config_message));
ue->ntn_config_message->update = false;
// initialize all signal buffers
init_nr_ue_signal(ue, nb_connected_gNB);
// intialize transport
init_nr_ue_transport(ue);
ue->ta_frame = -1;
ue->ta_slot = -1;
}
/*!
* It performs band scanning and synchonization.
* \param arg is a pointer to a \ref PHY_VARS_NR_UE structure.
*/
typedef struct {
PHY_VARS_NR_UE *UE;
UE_nr_rxtx_proc_t proc;
nr_gscn_info_t gscnInfo[MAX_GSCN_BAND];
int numGscn;
int rx_offset;
} syncData_t;
static int nr_ue_adjust_rx_gain(PHY_VARS_NR_UE *UE, openair0_config_t *cfg0, int gain_change)
{
// Increase the RX gain by the value determined by adjust_rxgain
cfg0->rx_gain[0] += gain_change;
// Set new RX gain.
int ret_gain = UE->rfdevice.trx_set_gains_func(&UE->rfdevice, cfg0);
// APPLY RX gain again if crossed the MAX RX gain threshold
if (ret_gain < 0) {
gain_change += ret_gain;
cfg0->rx_gain[0] += ret_gain;
ret_gain = UE->rfdevice.trx_set_gains_func(&UE->rfdevice, cfg0);
}
int applied_rxgain = cfg0->rx_gain[0] - cfg0->rx_gain_offset[0];
LOG_I(PHY, "Rxgain adjusted by %d dB, RX gain: %d dB \n", gain_change, applied_rxgain);
return gain_change;
}
static void UE_synch(void *arg) {
syncData_t *syncD = (syncData_t *)arg;
PHY_VARS_NR_UE *UE = syncD->UE;
UE->is_synchronized = 0;
openair0_config_t *cfg0 = &UE->openair0_cfg[UE->rf_map.card];
if (UE->target_Nid_cell != -1) {
LOG_W(NR_PHY, "Starting re-sync detection for target Nid_cell %i\n", UE->target_Nid_cell);
} else {
LOG_W(NR_PHY, "Starting sync detection\n");
}
LOG_I(PHY, "[UE thread Synch] Running Initial Synch \n");
uint64_t dl_carrier, ul_carrier;
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
nr_initial_sync_t ret = {false, 0, 0};
if (UE->sl_mode == 2) {
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
dl_carrier = fp->sl_CarrierFreq;
ul_carrier = fp->sl_CarrierFreq;
ret = sl_nr_slss_search(UE, &syncD->proc, SL_NR_SSB_REPETITION_IN_FRAMES);
} else {
nr_get_carrier_frequencies(UE, &dl_carrier, &ul_carrier);
ret = nr_initial_sync(&syncD->proc, UE, 2, IS_SA_MODE(get_softmodem_params()), syncD->gscnInfo, syncD->numGscn);
}
if (ret.cell_detected) {
syncD->rx_offset = ret.rx_offset;
const int freq_offset = UE->common_vars.freq_offset; // frequency offset computed with pss in initial sync
const int hw_slot_offset =
((ret.rx_offset << 1) / fp->samples_per_subframe * fp->slots_per_subframe)
+ round((float)((ret.rx_offset << 1) % fp->samples_per_subframe) / fp->samples_per_slot0);
if (get_nrUE_params()->cont_fo_comp) {
UE->freq_offset = freq_offset;
} else {
// rerun with new cell parameters and frequency-offset
nr_rf_card_config_freq(cfg0, ul_carrier, dl_carrier, freq_offset);
UE->rfdevice.trx_set_freq_func(&UE->rfdevice, cfg0);
}
if (get_nrUE_params()->agc) {
nr_ue_adjust_rx_gain(UE, cfg0, UE->adjust_rxgain);
}
LOG_I(PHY,
"Got synch: hw_slot_offset %d, carrier off %d Hz, rxgain %f (DL %f Hz, UL %f Hz)\n",
hw_slot_offset,
freq_offset,
cfg0->rx_gain[0] - cfg0->rx_gain_offset[0],
cfg0->rx_freq[0],
cfg0->tx_freq[0]);
UE->is_synchronized = 1;
} else {
int gain_change = 0;
if (get_nrUE_params()->agc)
gain_change = nr_ue_adjust_rx_gain(UE, cfg0, INCREASE_IN_RXGAIN);
if (gain_change)
LOG_I(PHY, "synch retry: Rx gain increased \n");
else
LOG_E(PHY, "synch Failed: \n");
}
}
static int nr_ue_slot_select(const fapi_nr_config_request_t *cfg, int nr_slot)
{
if (cfg->cell_config.frame_duplex_type == FDD)
return NR_UPLINK_SLOT | NR_DOWNLINK_SLOT;
const fapi_nr_tdd_table_t *tdd_table = &cfg->tdd_table;
int rel_slot = nr_slot % tdd_table->tdd_period_in_slots;
if (tdd_table->max_tdd_periodicity_list == NULL) // this happens before receiving TDD configuration
return NR_DOWNLINK_SLOT;
const fapi_nr_max_tdd_periodicity_t *current_slot = &tdd_table->max_tdd_periodicity_list[rel_slot];
// if the 1st symbol is UL the whole slot is UL
if (current_slot->max_num_of_symbol_per_slot_list[0].slot_config == 1)
return NR_UPLINK_SLOT;
// if the 1st symbol is flexible the whole slot is mixed
if (current_slot->max_num_of_symbol_per_slot_list[0].slot_config == 2)
return NR_MIXED_SLOT;
for (int i = 1; i < NR_NUMBER_OF_SYMBOLS_PER_SLOT; i++) {
// if the 1st symbol is DL and any other is not, the slot is mixed
if (current_slot->max_num_of_symbol_per_slot_list[i].slot_config != 0) {
return NR_MIXED_SLOT;
}
}
// if here, all the symbols where DL
return NR_DOWNLINK_SLOT;
}
static void RU_write(nr_rxtx_thread_data_t *rxtxD, bool sl_tx_action, c16_t **txp)
{
PHY_VARS_NR_UE *UE = rxtxD->UE;
const fapi_nr_config_request_t *cfg = &UE->nrUE_config;
const UE_nr_rxtx_proc_t *proc = &rxtxD->proc;
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
if (UE->sl_mode == 2)
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
int slot = proc->nr_slot_tx;
radio_tx_burst_flag_t flags = TX_BURST_INVALID;
if (UE->received_config_request) {
if (UE->openair0_cfg[0].duplex_mode == duplex_mode_FDD || get_softmodem_params()->continuous_tx) {
flags = TX_BURST_MIDDLE;
// In case of Sidelink, USRP write needed only in case transmission
// needs to be done in this slot and not based on tdd ULDL configuration.
} else if (UE->sl_mode == 2) {
if (sl_tx_action)
flags = TX_BURST_START_AND_END;
} else {
int slots_frame = fp->slots_per_frame;
int curr_slot = nr_ue_slot_select(cfg, slot);
if (curr_slot != NR_DOWNLINK_SLOT) {
int next_slot = nr_ue_slot_select(cfg, (slot + 1) % slots_frame);
int prev_slot = nr_ue_slot_select(cfg, (slot + slots_frame - 1) % slots_frame);
if (prev_slot == NR_DOWNLINK_SLOT)
flags = TX_BURST_START;
else if (next_slot == NR_DOWNLINK_SLOT)
flags = TX_BURST_END;
else
flags = TX_BURST_MIDDLE;
}
}
}
if (!IS_SOFTMODEM_RFSIM) {
uint64_t deadline_us = rxtxD->absolute_deadline_us;
struct timespec current_time;
if (clock_gettime(CLOCK_REALTIME, &current_time)) {
LOG_E(PHY, "clock_gettime failed\n");
}
uint64_t current_time_us = current_time.tv_sec * 1e6 + current_time.tv_nsec / 1e3;
if (current_time_us > deadline_us) {
static unsigned int deadline_warning_rate_limit = 0;
if (deadline_warning_rate_limit % 1000 == 0) {
LOG_W(PHY,
"Deadline missed for tx slot %d.%d (current time %lu us, deadline %lu us, missed by %lu)\n",
proc->frame_tx,
proc->nr_slot_tx,
current_time_us,
deadline_us,
current_time_us - deadline_us);
}
deadline_warning_rate_limit++;
}
}
openair0_timestamp writeTimestamp = proc->timestamp_tx;
int writeBlockSize = rxtxD->writeBlockSize;
// if writeBlockSize gets longer that slot size, fill with dummy
const int maxWriteBlockSize = fp->get_samples_per_slot(proc->nr_slot_tx, fp);
while (writeBlockSize > maxWriteBlockSize) {
const int dummyBlockSize = min(writeBlockSize - maxWriteBlockSize, maxWriteBlockSize);
int tmp = openair0_write_reorder(&UE->rfdevice, writeTimestamp, (void **)txp, dummyBlockSize, fp->nb_antennas_tx, flags);
AssertFatal(tmp == dummyBlockSize, "");
writeTimestamp += dummyBlockSize;
writeBlockSize -= dummyBlockSize;
}
// pre-compensate UL frequency offset
if (flags != TX_BURST_INVALID && get_nrUE_params()->cont_fo_comp) {
double ul_freq_offset = -UE->freq_offset * ((double)fp->ul_CarrierFreq / (double)fp->dl_CarrierFreq);
if (get_nrUE_params()->cont_fo_comp == 2) // different from LO frequency error compensation, Doppler UL pre-compensation has to be negative
ul_freq_offset = -ul_freq_offset;
for (int i = 0; i < fp->nb_antennas_tx; i++)
nr_fo_compensation(ul_freq_offset, fp->samples_per_subframe, writeTimestamp, txp[i], txp[i], writeBlockSize);
}
int tmp = openair0_write_reorder(&UE->rfdevice, writeTimestamp, (void **)txp, writeBlockSize, fp->nb_antennas_tx, flags);
AssertFatal(tmp == writeBlockSize, "");
}
void processSlotTX(void *arg)
{
TracyCZone(ctx, true);
nr_rxtx_thread_data_t *rxtxD = arg;
const UE_nr_rxtx_proc_t *proc = &rxtxD->proc;
PHY_VARS_NR_UE *UE = rxtxD->UE;
nr_phy_data_tx_t phy_data = {0};
bool sl_tx_action = false;
if (UE->if_inst)
UE->if_inst->slot_indication(UE->Mod_id, true);
LOG_D(PHY, "SlotTx %d.%d => slot type %d\n", proc->frame_tx, proc->nr_slot_tx, proc->tx_slot_type);
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
c16_t *txp[fp->nb_antennas_tx];
for (int i = 0; i < fp->nb_antennas_tx; i++) {
txp[i] = UE->common_vars.txData[i] + fp->get_samples_slot_timestamp(proc->nr_slot_tx, fp, 0);
}
if (proc->tx_slot_type == NR_UPLINK_SLOT || proc->tx_slot_type == NR_MIXED_SLOT) {
if (UE->sl_mode == 2 && proc->tx_slot_type == NR_SIDELINK_SLOT) {
// trigger L2 to run ue_sidelink_scheduler thru IF module
if (UE->if_inst != NULL && UE->if_inst->sl_indication != NULL) {
start_meas(&UE->ue_ul_indication_stats);
nr_sidelink_indication_t sl_indication = {.module_id = UE->Mod_id,
.gNB_index = proc->gNB_id,
.cc_id = UE->CC_id,
.hfn_tx = proc->hfn_tx,
.frame_tx = proc->frame_tx,
.slot_tx = proc->nr_slot_tx,
.hfn_rx = proc->hfn_rx,
.frame_rx = proc->frame_rx,
.slot_rx = proc->nr_slot_rx,
.slot_type = SIDELINK_SLOT_TYPE_TX,
.phy_data = &phy_data};
UE->if_inst->sl_indication(&sl_indication);
stop_meas(&UE->ue_ul_indication_stats);
}
dynamic_barrier_join(rxtxD->next_barrier);
if (phy_data.sl_tx_action) {
AssertFatal((phy_data.sl_tx_action >= SL_NR_CONFIG_TYPE_TX_PSBCH &&
phy_data.sl_tx_action < SL_NR_CONFIG_TYPE_TX_MAXIMUM), "Incorrect SL TX Action Scheduled\n");
phy_procedures_nrUE_SL_TX(UE, proc, &phy_data, txp);
sl_tx_action = true;
}
} else {
// trigger L2 to run ue_scheduler thru IF module
// [TODO] mapping right after NR initial sync
if (UE->if_inst != NULL && UE->if_inst->ul_indication != NULL) {
start_meas(&UE->ue_ul_indication_stats);
nr_uplink_indication_t ul_indication = {.module_id = UE->Mod_id,
.gNB_index = proc->gNB_id,
.cc_id = UE->CC_id,
.frame = proc->frame_tx,
.slot = proc->nr_slot_tx,
.phy_data = &phy_data};
UE->if_inst->ul_indication(&ul_indication);
stop_meas(&UE->ue_ul_indication_stats);
}
dynamic_barrier_join(rxtxD->next_barrier);
phy_procedures_nrUE_TX(UE, proc, &phy_data, txp);
}
} else {
dynamic_barrier_join(rxtxD->next_barrier);
}
RU_write(rxtxD, sl_tx_action, txp);
TracyCZoneEnd(ctx);
}
static uint64_t get_carrier_frequency(const int N_RB, const int mu, const uint32_t pointA_freq_khz)
{
const uint64_t bw = (NR_NB_SC_PER_RB * N_RB) * MU_SCS(mu);
const uint64_t carrier_freq = (pointA_freq_khz + bw / 2) * 1000;
return carrier_freq;
}
static int handle_sync_req_from_mac(PHY_VARS_NR_UE *UE)
{
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
// Start synchronization with a target gNB
if (UE->synch_request.received_synch_request == 1) {
// if upper layers signal BW scan we do as instructed by command line parameter
// if upper layers disable BW scan we set it to false
if (UE->synch_request.synch_req.ssb_bw_scan)
UE->UE_scan_carrier = get_nrUE_params()->UE_scan_carrier;
else
UE->UE_scan_carrier = false;
UE->target_Nid_cell = UE->synch_request.synch_req.target_Nid_cell;
const fapi_nr_ue_carrier_config_t *cfg = &UE->nrUE_config.carrier_config;
uint64_t dl_CarrierFreq = get_carrier_frequency(fp->N_RB_DL, fp->numerology_index, cfg->dl_frequency);
uint64_t ul_CarrierFreq = get_carrier_frequency(fp->N_RB_UL, fp->numerology_index, cfg->uplink_frequency);
if (dl_CarrierFreq != fp->dl_CarrierFreq || ul_CarrierFreq != fp->ul_CarrierFreq) {
fp->dl_CarrierFreq = dl_CarrierFreq;
fp->ul_CarrierFreq = ul_CarrierFreq;
nr_rf_card_config_freq(&UE->openair0_cfg[UE->rf_map.card], ul_CarrierFreq, dl_CarrierFreq, 0);
UE->rfdevice.trx_set_freq_func(&UE->rfdevice, &UE->openair0_cfg[UE->rf_map.card]);
init_symbol_rotation(fp);
}
/* Clearing UE harq while DL actors are active causes race condition.
So we let the current execution to complete here.*/
for (int i = 0; i < get_nrUE_params()->num_dl_actors; i++) {
flush_actor(UE->dl_actors + i);
}
for (int i = 0; i < get_nrUE_params()->num_ul_actors; i++) {
flush_actor(UE->ul_actors + i);
}
clean_UE_harq(UE);
UE->is_synchronized = 0;
UE->synch_request.received_synch_request = 0;
return 0;
}
return 1;
}
static int UE_dl_preprocessing(PHY_VARS_NR_UE *UE,
const UE_nr_rxtx_proc_t *proc,
int *tx_wait_for_dlsch,
nr_phy_data_t *phy_data,
bool *stats_printed)
{
TracyCZone(ctx, true);
int sampleShift = INT_MAX;
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
if (UE->sl_mode == 2)
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
// process what RRC thread sent to MAC
do {
notifiedFIFO_elt_t *elt = pollNotifiedFIFO(&get_mac_inst(UE->Mod_id)->input_nf);
if (!elt) {
break;
}
process_msg_rcc_to_mac(NotifiedFifoData(elt), UE->Mod_id);
delNotifiedFIFO_elt(elt);
} while (true);
if (UE->if_inst)
UE->if_inst->slot_indication(UE->Mod_id, false);
bool dl_slot = false;
if (proc->rx_slot_type == NR_DOWNLINK_SLOT || proc->rx_slot_type == NR_MIXED_SLOT) {
dl_slot = true;
if(UE->if_inst != NULL && UE->if_inst->dl_indication != NULL) {
nr_downlink_indication_t dl_indication;
nr_fill_dl_indication(&dl_indication, NULL, NULL, proc, UE, phy_data);
UE->if_inst->dl_indication(&dl_indication);
}
sampleShift = pbch_processing(UE, proc, phy_data);
pdcch_processing(UE, proc, phy_data);
if (phy_data->dlsch[0].active
&& (phy_data->dlsch[0].rnti_type == TYPE_C_RNTI_ || phy_data->dlsch[0].rnti_type == TYPE_RA_RNTI_)) {
// indicate to tx thread to wait for DLSCH decoding
if (phy_data->dlsch[0].dlsch_config.k1_feedback) { // if feedback is 0 there is no HARQ associated with this DLSCH
const int ack_nack_slot = (proc->nr_slot_rx + phy_data->dlsch[0].dlsch_config.k1_feedback) % fp->slots_per_frame;
tx_wait_for_dlsch[ack_nack_slot]++;
}
}
}
if (fp->frame_type == FDD || !dl_slot) {
// good time to print statistics, we don't have to spend time to decode DCI
if (proc->frame_rx % 128 == 0) {
if (*stats_printed == false) {
print_ue_mac_stats(UE->Mod_id, proc->frame_rx, proc->nr_slot_rx);
*stats_printed = true;
}
} else {
*stats_printed = false;
}
}
if (UE->sl_mode == 2) {
if (proc->rx_slot_type == NR_SIDELINK_SLOT) {
phy_data->sl_rx_action = 0;
if (UE->if_inst != NULL && UE->if_inst->sl_indication != NULL) {
nr_sidelink_indication_t sl_indication;
nr_fill_sl_indication(&sl_indication, NULL, NULL, proc, UE, phy_data);
UE->if_inst->sl_indication(&sl_indication);
}
if (phy_data->sl_rx_action) {
AssertFatal((phy_data->sl_rx_action >= SL_NR_CONFIG_TYPE_RX_PSBCH &&
phy_data->sl_rx_action < SL_NR_CONFIG_TYPE_RX_MAXIMUM), "Incorrect SL RX Action Scheduled\n");
sampleShift = psbch_pscch_processing(UE, proc, phy_data);
}
}
} else
ue_ta_procedures(UE, proc->nr_slot_tx, proc->frame_tx);
TracyCZoneEnd(ctx);
return sampleShift;
}
void UE_dl_processing(void *arg) {
TracyCZone(ctx, true);;
nr_rxtx_thread_data_t *rxtxD = (nr_rxtx_thread_data_t *) arg;
UE_nr_rxtx_proc_t *proc = &rxtxD->proc;
PHY_VARS_NR_UE *UE = rxtxD->UE;
nr_phy_data_t *phy_data = &rxtxD->phy_data;
if (!UE->sl_mode)
pdsch_processing(UE, proc, phy_data);
TracyCZoneEnd(ctx);
}
void dummyWrite(PHY_VARS_NR_UE *UE,openair0_timestamp timestamp, int writeBlockSize) {
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
if (UE->sl_mode == 2)
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
void *dummy_tx[fp->nb_antennas_tx];
// 2 because the function we call use pairs of int16_t implicitly as complex numbers
int16_t dummy_tx_data[fp->nb_antennas_tx][2 * writeBlockSize];
memset(dummy_tx_data, 0, sizeof(dummy_tx_data));
for (int i = 0; i < fp->nb_antennas_tx; i++)
dummy_tx[i]=dummy_tx_data[i];
int tmp = UE->rfdevice.trx_write_func(&UE->rfdevice, timestamp, dummy_tx, writeBlockSize, fp->nb_antennas_tx, 4);
AssertFatal(writeBlockSize == tmp, "");
}
void readFrame(PHY_VARS_NR_UE *UE, openair0_timestamp *timestamp, int duration_rx_to_tx, bool toTrash)
{
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
// two frames for initial sync
int num_frames = 2;
// In Sidelink worst case SL-SSB can be sent once in 16 frames
if (UE->sl_mode == 2) {
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
num_frames = SL_NR_PSBCH_REPETITION_IN_FRAMES;
}
void *rxp[NB_ANTENNAS_RX];
if (toTrash)
for (int i = 0; i < fp->nb_antennas_rx; i++)
rxp[i] = malloc16(fp->get_samples_per_slot(0, fp) * 4);
for (int x = 0; x < num_frames * NR_NUMBER_OF_SUBFRAMES_PER_FRAME; x++) { // two frames for initial sync
for (int slot = 0; slot < fp->slots_per_subframe; slot++) {
if (!toTrash)
for (int i = 0; i < fp->nb_antennas_rx; i++)
rxp[i] = ((void *)&UE->common_vars.rxdata[i][0])
+ 4 * ((x * fp->samples_per_subframe) + fp->get_samples_slot_timestamp(slot, fp, 0));
int read_block_size = fp->get_samples_per_slot(slot, fp);
int tmp = UE->rfdevice.trx_read_func(&UE->rfdevice, timestamp, rxp, read_block_size, fp->nb_antennas_rx);
UEscopeCopy(UE, ueTimeDomainSamplesBeforeSync, rxp[0], sizeof(c16_t), 1, read_block_size, 0);
AssertFatal(read_block_size == tmp, "");
if (IS_SOFTMODEM_RFSIM) {
const openair0_timestamp writeTimestamp = *timestamp + fp->get_samples_slot_timestamp(slot, fp, duration_rx_to_tx)
- UE->N_TA_offset - UE->timing_advance - UE->timing_advance_ntn;
dummyWrite(UE, writeTimestamp, fp->get_samples_per_slot(slot, fp));
}
}
}
if (toTrash)
for (int i = 0; i < fp->nb_antennas_rx; i++)
free(rxp[i]);
}
static void syncInFrame(PHY_VARS_NR_UE *UE, openair0_timestamp *timestamp, int duration_rx_to_tx, openair0_timestamp rx_offset)
{
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
if (UE->sl_mode == 2)
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
LOG_I(PHY, "Resynchronizing RX by %ld samples\n", rx_offset);
int slot = 0;
int size = rx_offset;
while (size > 0) {
const int unitTransfer = min(fp->get_samples_per_slot(slot, fp), size);
const int res = UE->rfdevice.trx_read_func(&UE->rfdevice, timestamp, (void **)UE->common_vars.rxdata, unitTransfer, fp->nb_antennas_rx);
DevAssert(unitTransfer == res);
if (IS_SOFTMODEM_RFSIM) {
const openair0_timestamp writeTimestamp = *timestamp + fp->get_samples_slot_timestamp(slot, fp, duration_rx_to_tx)
- UE->N_TA_offset - UE->timing_advance - UE->timing_advance_ntn;
dummyWrite(UE, writeTimestamp, unitTransfer);
}
slot = (slot + 1) % fp->slots_per_subframe;
size -= unitTransfer;
}
}
static inline int get_firstSymSamp(uint16_t slot, NR_DL_FRAME_PARMS *fp) {
if (fp->numerology_index == 0)
return fp->nb_prefix_samples0 + fp->ofdm_symbol_size;
int num_samples = (slot%(fp->slots_per_subframe/2)) ? fp->nb_prefix_samples : fp->nb_prefix_samples0;
num_samples += fp->ofdm_symbol_size;
return num_samples;
}
static inline int get_readBlockSize(uint16_t slot, NR_DL_FRAME_PARMS *fp) {
int rem_samples = fp->get_samples_per_slot(slot, fp) - get_firstSymSamp(slot, fp);
int next_slot_first_symbol = 0;
if (slot < (fp->slots_per_frame-1))
next_slot_first_symbol = get_firstSymSamp(slot+1, fp);
return rem_samples + next_slot_first_symbol;
}
#define SPEED_OF_LIGHT 299792458
static inline void apply_ntn_timing_advance(PHY_VARS_NR_UE *UE, const NR_DL_FRAME_PARMS *fp, int abs_subframe_tx)
{
const fapi_nr_dl_ntn_config_command_pdu *ntn_config_params = &UE->ntn_config_message->ntn_config_params;
const int abs_subframe_epoch = ntn_config_params->epoch_subframe
+ ntn_config_params->epoch_sfn * 10
+ ntn_config_params->epoch_hfn * 10240;
const int ms_since_epoch = abs_subframe_tx - abs_subframe_epoch;
const double omega = ntn_config_params->omega;
const double cos_wt = cos(omega * ms_since_epoch);
const double sin_wt = sin(omega * ms_since_epoch);
const position_t pos_sat_0 = ntn_config_params->pos_sat_0;
const position_t pos_sat_90 = ntn_config_params->pos_sat_90;
const position_t pos_sat = {pos_sat_0.X * cos_wt + pos_sat_90.X * sin_wt,
pos_sat_0.Y * cos_wt + pos_sat_90.Y * sin_wt,
pos_sat_0.Z * cos_wt + pos_sat_90.Z * sin_wt};
position_t pos_ue = {0};
get_position_coordinates(UE->Mod_id, &pos_ue);
// calculate directional vector from SAT to UE
const position_t dir_sat_ue = {pos_ue.X - pos_sat.X, pos_ue.Y - pos_sat.Y, pos_ue.Z - pos_sat.Z};
// calculate distance between SAT and UE
const double distance = sqrt(dir_sat_ue.X * dir_sat_ue.X + dir_sat_ue.Y * dir_sat_ue.Y + dir_sat_ue.Z * dir_sat_ue.Z);
// calculate round-trip-time (factor 2) between SAT and UE in ms (factor 1000)
const double N_UE_TA_adj = 2000 * distance / SPEED_OF_LIGHT;
const double N_common_ta_adj = ntn_config_params->N_common_ta_adj;
const double N_common_ta_drift = ntn_config_params->N_common_ta_drift;
const double N_common_ta_drift_variant = ntn_config_params->N_common_ta_drift_variant;
UE->timing_advance_ntn = (N_UE_TA_adj + N_common_ta_adj
+ N_common_ta_drift * ms_since_epoch / 1e6
+ N_common_ta_drift_variant * ((int64_t)ms_since_epoch * ms_since_epoch) / 1e9)
* fp->samples_per_subframe;
LOG_D(PHY,
"N_UE_TA_adj = %f ms, N_common_ta_adj = %f ms, N_common_ta_drift = %f µs/s, N_common_ta_drift_variant = %f µs/s², ms_since_epoch = %d ms, "
"computed timing_advance_ntn = %d samples\n",
N_UE_TA_adj,
N_common_ta_adj,
N_common_ta_drift,
N_common_ta_drift_variant,
ms_since_epoch,
UE->timing_advance_ntn);
}
static inline void apply_ntn_config(PHY_VARS_NR_UE *UE,
NR_DL_FRAME_PARMS *fp,
int hfn_rx,
int frame_rx,
int slot_rx,
int *duration_rx_to_tx,
int *timing_advance,
int *ntn_koffset)
{
if (UE->ntn_config_message->update) {
UE->ntn_config_message->update = false;
const int mu = fp->numerology_index;
const int koffset = UE->ntn_config_message->ntn_config_params.cell_specific_k_offset;
*duration_rx_to_tx = NR_UE_CAPABILITY_SLOT_RX_TO_TX + (koffset << mu);
if (koffset > *ntn_koffset)
*timing_advance += fp->get_samples_slot_timestamp(slot_rx, fp, (koffset - *ntn_koffset) << mu);
else if (koffset < *ntn_koffset)
*timing_advance -= fp->get_samples_slot_timestamp(slot_rx, fp, (*ntn_koffset - koffset) << mu);
*ntn_koffset = koffset;
const int abs_subframe_tx = 10240 * hfn_rx + 10 * frame_rx + ((slot_rx + *duration_rx_to_tx) >> mu);
apply_ntn_timing_advance(UE, fp, abs_subframe_tx);
}
}
void *UE_thread(void *arg)
{
//this thread should be over the processing thread to keep in real time
PHY_VARS_NR_UE *UE = (PHY_VARS_NR_UE *) arg;
// int tx_enabled = 0;
void *rxp[NB_ANTENNAS_RX];
enum stream_status_e stream_status = STREAM_STATUS_UNSYNC;
fapi_nr_config_request_t *cfg = &UE->nrUE_config;
int tmp = openair0_device_load(&(UE->rfdevice), &UE->openair0_cfg[0]);
AssertFatal(tmp == 0, "Could not load the device\n");
NR_DL_FRAME_PARMS *fp = &UE->frame_parms;
sl_nr_phy_config_request_t *sl_cfg = NULL;
if (UE->sl_mode == 2) {
fp = &UE->SL_UE_PHY_PARAMS.sl_frame_params;
sl_cfg = &UE->SL_UE_PHY_PARAMS.sl_config;
}
UE->rfdevice.host_type = RAU_HOST;
UE->is_synchronized = 0;
int tmp2 = UE->rfdevice.trx_start_func(&UE->rfdevice);
AssertFatal(tmp2 == 0, "Could not start the device\n");
if (usrp_tx_thread == 1)
UE->rfdevice.trx_write_init(&UE->rfdevice);
InitSinLUT();
notifiedFIFO_t nf;
initNotifiedFIFO(&nf);
notifiedFIFO_t freeBlocks;
initNotifiedFIFO_nothreadSafe(&freeBlocks);
double ntn_init_time_drift = get_nrUE_params()->ntn_init_time_drift;
int ntn_koffset = 0;
int duration_rx_to_tx = NR_UE_CAPABILITY_SLOT_RX_TO_TX;
int timing_advance = UE->timing_advance + UE->timing_advance_ntn;
UE->N_TA_offset = determine_N_TA_offset(UE);
NR_UE_MAC_INST_t *mac = get_mac_inst(UE->Mod_id);
bool syncRunning = false;
const int nb_slot_frame = fp->slots_per_frame;
int absolute_slot = 0, decoded_frame_rx = MAX_FRAME_NUMBER - 1, trashed_frames = 0;
int tx_wait_for_dlsch[NR_MAX_SLOTS_PER_FRAME];
for(int i = 0; i < NUM_PROCESS_SLOT_TX_BARRIERS; i++) {
dynamic_barrier_init(&UE->process_slot_tx_barriers[i]);
}
int shiftForNextFrame = 0;
int intialSyncOffset = 0;
openair0_timestamp sync_timestamp;
bool stats_printed = false;
if (get_softmodem_params()->sync_ref && UE->sl_mode == 2) {
UE->is_synchronized = 1;
} else {
//warm up the RF board
int64_t tmp;
for (int i = 0; i < 50; i++)
readFrame(UE, &tmp, duration_rx_to_tx, true);
}
while (!oai_exit) {
if (syncRunning) {
notifiedFIFO_elt_t *res = pollNotifiedFIFO(&nf);
if (res) {
syncRunning = false;
if (UE->is_synchronized) {
UE->synch_request.received_synch_request = 0;
if (UE->sl_mode == SL_MODE2_SUPPORTED)
decoded_frame_rx = UE->SL_UE_PHY_PARAMS.sync_params.DFN;
else {
// We must wait the RRC layer decoded the MIB and sent us the frame number
notifiedFIFO_elt_t *elt = pullNotifiedFIFO(&mac->input_nf);
AssertFatal(elt != NULL, "fifo error while waiting for MIB");
process_msg_rcc_to_mac(NotifiedFifoData(elt), UE->Mod_id);
delNotifiedFIFO_elt(elt);
decoded_frame_rx = mac->mib_frame;
}
LOG_A(PHY,
"UE synchronized! decoded_frame_rx=%d UE->init_sync_frame=%d trashed_frames=%d\n",
decoded_frame_rx,
UE->init_sync_frame,
trashed_frames);
// shift the frame index with all the frames we trashed meanwhile we perform the synch search
decoded_frame_rx = (decoded_frame_rx + UE->init_sync_frame + trashed_frames) % MAX_FRAME_NUMBER;
syncData_t *syncMsg = (syncData_t *)NotifiedFifoData(res);
intialSyncOffset = syncMsg->rx_offset;
}
delNotifiedFIFO_elt(res);
stream_status = STREAM_STATUS_UNSYNC;
} else {
if (IS_SOFTMODEM_IQPLAYER || IS_SOFTMODEM_IQRECORDER) {
/* For IQ recorder-player we force synchronization to happen in a fixed duration so that
the replay runs in sync with recorded samples.
*/
const unsigned int sync_in_frames = UE->rfdevice.openair0_cfg->recplay_conf->u_f_sync;
while (trashed_frames != sync_in_frames) {
readFrame(UE, &sync_timestamp, duration_rx_to_tx, true);
trashed_frames += 2;
}
} else {
readFrame(UE, &sync_timestamp, duration_rx_to_tx, true);
trashed_frames += ((UE->sl_mode == 2) ? SL_NR_PSBCH_REPETITION_IN_FRAMES : 2);
}
continue;
}
}
AssertFatal(!syncRunning, "At this point synchronization can't be running\n");
if (!UE->is_synchronized) {
readFrame(UE, &sync_timestamp, duration_rx_to_tx, false);
notifiedFIFO_elt_t *Msg = newNotifiedFIFO_elt(sizeof(syncData_t), 0, &nf, UE_synch);
syncData_t *syncMsg = (syncData_t *)NotifiedFifoData(Msg);
*syncMsg = (syncData_t){0};
if (UE->UE_scan_carrier) {
// Get list of GSCN in this band for UE's bandwidth and center frequency.
LOG_W(PHY, "UE set to scan all GSCN in current bandwidth\n");
syncMsg->numGscn =
get_scan_ssb_first_sc(fp->dl_CarrierFreq, fp->N_RB_DL, fp->nr_band, fp->numerology_index, syncMsg->gscnInfo);
} else {
LOG_W(PHY, "SSB position provided\n");
syncMsg->gscnInfo[0] = (nr_gscn_info_t){.ssbFirstSC = fp->ssb_start_subcarrier};
syncMsg->numGscn = 1;
}
syncMsg->UE = UE;
memset(&syncMsg->proc, 0, sizeof(syncMsg->proc));
pushNotifiedFIFO(&UE->sync_actor.fifo, Msg);
if (ntn_koffset == 0) { // reset timing_advance for TN
timing_advance = 0;
UE->timing_advance = 0;
}
trashed_frames = 0;
syncRunning = true;
continue;
}
if (stream_status == STREAM_STATUS_UNSYNC) {
stream_status = STREAM_STATUS_SYNCING;
syncInFrame(UE, &sync_timestamp, duration_rx_to_tx, intialSyncOffset);
openair0_write_reorder_clear_context(&UE->rfdevice);
if (get_nrUE_params()->time_sync_I)
// ntn_init_time_drift is in µs/s, max_pos_acc * time_sync_I is in samples/frame
UE->max_pos_acc = ntn_init_time_drift * 1e-6 * fp->samples_per_frame / get_nrUE_params()->time_sync_I;
else
UE->max_pos_acc = 0;
shiftForNextFrame = -(UE->init_sync_frame + trashed_frames + 2) * UE->max_pos_acc * get_nrUE_params()->time_sync_I; // compensate for the time drift that happened during initial sync
LOG_D(PHY, "max_pos_acc = %d, shiftForNextFrame = %d\n", UE->max_pos_acc, shiftForNextFrame);
// read in first symbol
AssertFatal(fp->ofdm_symbol_size + fp->nb_prefix_samples0
== UE->rfdevice.trx_read_func(&UE->rfdevice,
&sync_timestamp,
(void **)UE->common_vars.rxdata,
fp->ofdm_symbol_size + fp->nb_prefix_samples0,
fp->nb_antennas_rx),
"");
// we have the decoded frame index in the return of the synch process
// and we shifted above to the first slot of next frame
decoded_frame_rx = (decoded_frame_rx + 1) % MAX_FRAME_NUMBER;
// we do ++ first in the regular processing, so it will be begin of frame;
absolute_slot = decoded_frame_rx * nb_slot_frame - 1;
if (UE->sl_mode == 2) {
// Set to the slot where the SL-SSB was decoded
absolute_slot += UE->SL_UE_PHY_PARAMS.sync_params.slot_offset;
}
// We have resynchronized, maybe after RF loss so we need to purge any existing context
memset(tx_wait_for_dlsch, 0, sizeof(tx_wait_for_dlsch));
for (int i = 0; i < NUM_PROCESS_SLOT_TX_BARRIERS; i++) {
dynamic_barrier_reset(&UE->process_slot_tx_barriers[i]);
}
continue;
}
/* check if MAC has sent sync request */
if (handle_sync_req_from_mac(UE) == 0)
continue;
// start of normal case, the UE is in sync
absolute_slot++;
TracyCFrameMark;
// pretend we have 1 iq sample per slot
// and so nb_slot_frame * 100 iq samples per second (1 frame being 10ms)
time_manager_iq_samples(1, nb_slot_frame * 100);
int slot_nr = absolute_slot % nb_slot_frame;
nr_rxtx_thread_data_t curMsg = {0};
curMsg.UE=UE;
// update thread index for received subframe
curMsg.proc.nr_slot_rx = slot_nr;
curMsg.proc.nr_slot_tx = (absolute_slot + duration_rx_to_tx) % nb_slot_frame;
curMsg.proc.frame_rx = (absolute_slot / nb_slot_frame) % MAX_FRAME_NUMBER;
curMsg.proc.frame_tx = ((absolute_slot + duration_rx_to_tx) / nb_slot_frame) % MAX_FRAME_NUMBER;
curMsg.proc.hfn_rx = (absolute_slot / nb_slot_frame) / MAX_FRAME_NUMBER;
curMsg.proc.hfn_tx = ((absolute_slot + duration_rx_to_tx) / nb_slot_frame) / MAX_FRAME_NUMBER;
if (UE->received_config_request) {
if (UE->sl_mode) {
curMsg.proc.rx_slot_type = sl_nr_ue_slot_select(sl_cfg, curMsg.proc.nr_slot_rx, TDD);
curMsg.proc.tx_slot_type = sl_nr_ue_slot_select(sl_cfg, curMsg.proc.nr_slot_tx, TDD);
} else {
curMsg.proc.rx_slot_type = nr_ue_slot_select(cfg, curMsg.proc.nr_slot_rx);
curMsg.proc.tx_slot_type = nr_ue_slot_select(cfg, curMsg.proc.nr_slot_tx);
}
}
else {
curMsg.proc.rx_slot_type = NR_DOWNLINK_SLOT;
curMsg.proc.tx_slot_type = NR_DOWNLINK_SLOT;
}
int firstSymSamp = get_firstSymSamp(slot_nr, fp);
for (int i = 0; i < fp->nb_antennas_rx; i++)
rxp[i] = (void *)&UE->common_vars.rxdata[i][firstSymSamp + fp->get_samples_slot_timestamp(slot_nr, fp, 0)];
int iq_shift_to_apply = 0;
if (slot_nr == nb_slot_frame - 1) {
// we shift of half of measured drift, at each beginning of frame for both rx and tx
iq_shift_to_apply = shiftForNextFrame;
// autonomous timing advance calculation, which does not use SIB19 information
if (ntn_koffset && get_nrUE_params()->autonomous_ta)
UE->timing_advance_ntn -= 2 * shiftForNextFrame;
shiftForNextFrame = -round(UE->max_pos_acc * get_nrUE_params()->time_sync_I);
}
// Calculate new TA based on SIB19 information for each subframe in NTN mode, if "autonomous_ta" is not enabled
if (ntn_koffset && !get_nrUE_params()->autonomous_ta && (absolute_slot + duration_rx_to_tx) % fp->slots_per_subframe == 0) {
const int abs_subframe_tx = (absolute_slot + duration_rx_to_tx) / fp->slots_per_subframe;
apply_ntn_timing_advance(UE, fp, abs_subframe_tx);
}
const int readBlockSize = get_readBlockSize(slot_nr, fp) - iq_shift_to_apply;
openair0_timestamp rx_timestamp;
int tmp = UE->rfdevice.trx_read_func(&UE->rfdevice, &rx_timestamp, rxp, readBlockSize, fp->nb_antennas_rx);
metadata meta = {.slot = curMsg.proc.nr_slot_rx, .frame = curMsg.proc.frame_rx};
UEscopeCopyWithMetadata(UE, ueTimeDomainSamples, rxp[0] - firstSymSamp * sizeof(c16_t), sizeof(c16_t), 1, readBlockSize, 0, &meta);
AssertFatal(readBlockSize == tmp, "");
struct timespec current_time;
if (clock_gettime(CLOCK_REALTIME, &current_time)) {
LOG_E(PHY, "clock_gettime failed\n");
}
if(slot_nr == (nb_slot_frame - 1)) {
// read in first symbol of next frame and adjust for timing drift
int first_symbols = fp->ofdm_symbol_size + fp->nb_prefix_samples0; // first symbol of every frames
if (first_symbols > 0) {
openair0_timestamp ignore_timestamp;
int tmp = UE->rfdevice.trx_read_func(&UE->rfdevice,
&ignore_timestamp,
(void **)UE->common_vars.rxdata,
first_symbols,
fp->nb_antennas_rx);
AssertFatal(first_symbols == tmp, "");
} else
LOG_E(PHY,"can't compensate: diff =%d\n", first_symbols);
}
// use previous timing_advance value to compute writeTimestamp
const openair0_timestamp writeTimestamp = rx_timestamp + fp->get_samples_slot_timestamp(slot_nr, fp, duration_rx_to_tx)
- firstSymSamp - UE->N_TA_offset - timing_advance;
// Calculate TX deadline, approximately 1 symbol before the first sample should be written
const uint64_t samples_diff = writeTimestamp - rx_timestamp - fp->ofdm_symbol_size;
const float deadline_us = samples_diff / UE->rfdevice.openair0_cfg->sample_rate * 1e6;
const uint64_t absolute_deadline_us = current_time.tv_sec * 1e6 + current_time.tv_nsec / 1e3 + deadline_us;
// but use current UE->timing_advance value to compute writeBlockSize
int writeBlockSize = fp->get_samples_per_slot((slot_nr + duration_rx_to_tx) % nb_slot_frame, fp) - iq_shift_to_apply;
int new_timing_advance = UE->timing_advance + UE->timing_advance_ntn;
if (new_timing_advance != timing_advance) {
writeBlockSize -= new_timing_advance - timing_advance;
timing_advance = new_timing_advance;
}
int new_N_TA_offset = determine_N_TA_offset(UE);
if (new_N_TA_offset != UE->N_TA_offset) {
LOG_I(PHY, "N_TA_offset changed from %d to %d\n", UE->N_TA_offset, new_N_TA_offset);
writeBlockSize -= new_N_TA_offset - UE->N_TA_offset;
UE->N_TA_offset = new_N_TA_offset;
}
if (curMsg.proc.nr_slot_rx == 0)
nr_ue_rrc_timer_trigger(UE->Mod_id, curMsg.proc.hfn_rx, curMsg.proc.frame_rx, curMsg.proc.gNB_id);
// RX slot processing. We launch and forget.
notifiedFIFO_elt_t *newRx = newNotifiedFIFO_elt(sizeof(nr_rxtx_thread_data_t), curMsg.proc.nr_slot_tx, NULL, UE_dl_processing);
nr_rxtx_thread_data_t *curMsgRx = (nr_rxtx_thread_data_t *)NotifiedFifoData(newRx);
*curMsgRx = (nr_rxtx_thread_data_t){.proc = curMsg.proc, .UE = UE};
int ret = UE_dl_preprocessing(UE, &curMsgRx->proc, tx_wait_for_dlsch, &curMsgRx->phy_data, &stats_printed);
if (ret != INT_MAX)
shiftForNextFrame = ret;
if (get_nrUE_params()->num_dl_actors > 0) {
pushNotifiedFIFO(&UE->dl_actors[curMsg.proc.nr_slot_rx % get_nrUE_params()->num_dl_actors].fifo, newRx);
} else {
newRx->processingFunc(curMsgRx);
}
// apply new NTN timing information
apply_ntn_config(UE, fp, curMsg.proc.hfn_rx, curMsg.proc.frame_rx, curMsg.proc.nr_slot_rx, &duration_rx_to_tx, &timing_advance, &ntn_koffset);
// Start TX slot processing here. It runs in parallel with RX slot processing
// in current code, DURATION_RX_TO_TX constant is the limit to get UL data to encode from a RX slot
notifiedFIFO_elt_t *newTx = newNotifiedFIFO_elt(sizeof(nr_rxtx_thread_data_t), 0, 0, processSlotTX);
nr_rxtx_thread_data_t *curMsgTx = NotifiedFifoData(newTx);
memset(curMsgTx, 0, sizeof(*curMsgTx));
curMsgTx->proc = curMsg.proc;
curMsgTx->writeBlockSize = writeBlockSize;
curMsgTx->proc.timestamp_tx = writeTimestamp;
curMsgTx->UE = UE;
curMsgTx->absolute_deadline_us = absolute_deadline_us;
int slot = curMsgTx->proc.nr_slot_tx;
int slot_and_frame = slot + curMsgTx->proc.frame_tx * UE->frame_parms.slots_per_frame;
int next_tx_slot_and_frame = absolute_slot + duration_rx_to_tx + 1;
int wait_for_prev_slot = stream_status == STREAM_STATUS_SYNCED ? 1 : 0;
dynamic_barrier_t *next_barrier = &UE->process_slot_tx_barriers[next_tx_slot_and_frame % NUM_PROCESS_SLOT_TX_BARRIERS];
curMsgTx->next_barrier = next_barrier;
dynamic_barrier_update(&UE->process_slot_tx_barriers[slot_and_frame % NUM_PROCESS_SLOT_TX_BARRIERS],
tx_wait_for_dlsch[slot] + wait_for_prev_slot,
start_process_slot_tx,
newTx);
stream_status = STREAM_STATUS_SYNCED;
tx_wait_for_dlsch[slot] = 0;
}
LOG_W(NR_PHY, "UE main thread is ending\n");
return NULL;
}
void init_NR_UE(int nb_inst, char *uecap_file, char *reconfig_file, char *rbconfig_file)
{
for (int instance_id = 0; instance_id < nb_inst; instance_id++) {
NR_UE_RRC_INST_t* rrc = nr_rrc_init_ue(uecap_file, instance_id, get_nrUE_params()->nb_antennas_tx);
NR_UE_MAC_INST_t *mac = nr_l2_init_ue(instance_id);
nr_rrc_set_mac_queue(instance_id, &mac->input_nf);
mac->if_module = nr_ue_if_module_init(instance_id);
AssertFatal(mac->if_module, "can not initialize IF module\n");
if (!IS_SA_MODE(get_softmodem_params()) && !get_softmodem_params()->sl_mode) {
init_nsa_message(rrc, reconfig_file, rbconfig_file);
nr_rlc_activate_srb0(mac->crnti, NULL, send_srb0_rrc);
}
//TODO: Move this call to RRC
start_sidelink(instance_id);
}
}
void init_NR_UE_threads(PHY_VARS_NR_UE *UE) {
char thread_name[16];
sprintf(thread_name, "UEthread_%d", UE->Mod_id);
threadCreate(&UE->main_thread, UE_thread, (void *)UE, thread_name, -1, OAI_PRIORITY_RT_MAX);
if (!IS_SOFTMODEM_NOSTATS) {
sprintf(thread_name, "L1_UE_stats_%d", UE->Mod_id);
threadCreate(&UE->stat_thread, nrL1_UE_stats_thread, UE, thread_name, -1, OAI_PRIORITY_RT_LOW);
}
}
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