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Handle changing N_TA_offset on the UE correctly in higher layers

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Send new N_TA_offset in config_request to PHY. Remove N_TA_offset update
from ta_command.
This commit is contained in:
Bartosz Podrygajlo
2025-03-10 16:00:54 +01:00
parent 5acb37c3e2
commit 75f04874d1
9 changed files with 48 additions and 61 deletions
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executables/nr-ue.c
+27 -8
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@@ -147,6 +147,24 @@ static void *nrL1_UE_stats_thread(void *param)
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;
@@ -165,8 +183,8 @@ void init_nr_ue_vars(PHY_VARS_NR_UE *ue, uint8_t UE_id)
// intialize transport
init_nr_ue_transport(ue);
// init N_TA offset
init_N_TA_offset(ue);
ue->ta_frame = -1;
ue->ta_slot = -1;
}
void init_nrUE_standalone_thread(int ue_idx)
@@ -867,7 +885,7 @@ void *UE_thread(void *arg)
initNotifiedFIFO_nothreadSafe(&freeBlocks);
int timing_advance = UE->timing_advance;
int N_TA_offset = UE->N_TA_offset;
UE->N_TA_offset = determine_N_TA_offset(UE);
NR_UE_MAC_INST_t *mac = get_mac_inst(UE->Mod_id);
bool syncRunning = false;
@@ -1090,7 +1108,7 @@ void *UE_thread(void *arg)
// 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 - N_TA_offset - timing_advance;
- firstSymSamp - UE->N_TA_offset - timing_advance;
// 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;
@@ -1099,10 +1117,11 @@ void *UE_thread(void *arg)
writeBlockSize -= new_timing_advance- timing_advance;
timing_advance = new_timing_advance;
}
int new_N_TA_offset = UE->N_TA_offset;
if (new_N_TA_offset != N_TA_offset) {
writeBlockSize -= new_N_TA_offset - N_TA_offset;
N_TA_offset = new_N_TA_offset;
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_tx == 0)