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NR UE: also use ta_CommonDriftVariant_r17 to calculate the initial timing advance

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Thomas Schlichter
2025-04-24 10:25:47 +00:00
parent 22866c3c1e
commit e91fb33da3
6 changed files with 20 additions and 3 deletions
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6
executables/nr-ue.c
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@@ -931,15 +931,17 @@ static inline void apply_ntn_config(PHY_VARS_NR_UE *UE,
const double total_ta_ms = UE->ntn_config_message->ntn_config_params.ntn_total_time_advance_ms;
const double total_ta_drift = UE->ntn_config_message->ntn_config_params.ntn_total_time_advance_drift; // µs/s
UE->timing_advance = fp->samples_per_subframe * (total_ta_ms + (total_ta_drift / 1000.0) * (ms_since_epoch / 1000.0));
const double total_ta_drift_variant = UE->ntn_config_message->ntn_config_params.ntn_total_time_advance_drift_variant; // µs/s²
UE->timing_advance = fp->samples_per_subframe * (total_ta_ms + (total_ta_drift / 1000.0) * (ms_since_epoch / 1000.0) + (total_ta_drift_variant / 1000.0) * (ms_since_epoch / 1000.0) * (ms_since_epoch / 1000.0));
LOG_I(PHY,
"k_offset = %d ms (%d slots), total_ta_ms = %f ms, total_ta_drift = %f µs/s, ms_since_epoch = %d ms, computed "
"k_offset = %d ms (%d slots), total_ta_ms = %f ms, total_ta_drift = %f µs/s, total_ta_drift_variant = %f µs/s², ms_since_epoch = %d ms, computed "
"timing_advance = %d samples\n",
*ntn_koffset,
*ntn_koffset << mu,
total_ta_ms,
total_ta_drift,
total_ta_drift_variant,
ms_since_epoch,
UE->timing_advance);
}

4
nfapi/open-nFAPI/nfapi/public_inc/fapi_nr_ue_interface.h
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@@ -563,8 +563,12 @@ typedef struct {
// cell scheduling offset expressed in terms of 15kHz SCS
long cell_specific_k_offset;
// ntn_total_time_advance_ms represents the complete round-trip-time between gNB and UE via SAT
double ntn_total_time_advance_ms;
// drift rate of ntn_total_time_advance_ms in µs/s
double ntn_total_time_advance_drift;
// change rate of ntn_total_time_advance_ms drift in µs/s²
double ntn_total_time_advance_drift_variant;
} fapi_nr_dl_ntn_config_command_pdu;
typedef struct {

1
openair1/SCHED_NR_UE/fapi_nr_ue_l1.c
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@@ -357,6 +357,7 @@ static void configure_ntn_params(PHY_VARS_NR_UE *ue, fapi_nr_dl_ntn_config_comma
ue->ntn_config_message->ntn_config_params.cell_specific_k_offset = ntn_params_message->cell_specific_k_offset;
ue->ntn_config_message->ntn_config_params.ntn_total_time_advance_ms = ntn_params_message->ntn_total_time_advance_ms;
ue->ntn_config_message->ntn_config_params.ntn_total_time_advance_drift = ntn_params_message->ntn_total_time_advance_drift;
ue->ntn_config_message->ntn_config_params.ntn_total_time_advance_drift_variant = ntn_params_message->ntn_total_time_advance_drift_variant;
ue->ntn_config_message->update = true;
}

9
openair2/LAYER2/NR_MAC_UE/config_ue.c
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@@ -339,20 +339,27 @@ static void configure_ntn_ta(module_id_t module_id,
ntn_ta->N_common_ta_drift = *ntn_Config_r17->ta_Info_r17->ta_CommonDrift_r17 * 0.2e-3;
else // Need R - Release if not present
ntn_ta->N_common_ta_drift = 0;
// ta_CommonDriftVariant_r17 (is in units of 0.2e-4 µs/s²)
if (ntn_Config_r17->ta_Info_r17->ta_CommonDriftVariant_r17)
ntn_ta->N_common_ta_drift_variant = *ntn_Config_r17->ta_Info_r17->ta_CommonDriftVariant_r17 * 0.2e-4;
else // Need R - Release if not present
ntn_ta->N_common_ta_drift_variant = 0;
} else { // Need R - Release if not present
ntn_ta->N_common_ta_adj = 0;
ntn_ta->N_common_ta_drift = 0;
ntn_ta->N_common_ta_drift_variant = 0;
}
ntn_ta->ntn_params_changed = true;
LOG_D(NR_MAC,
"SIB19 Rxd. Epoch SFN: %d, Epoch Subframe: %d, k_offset: %ldms, N_Common_Ta: %fms, drift: %fµs/s, N_UE_TA: %fms, drift: %fµs/s\n",
"SIB19 Rxd. Epoch SFN: %d, Epoch Subframe: %d, k_offset: %ldms, N_Common_Ta: %fms, drift: %fµs/s, variant %fµs/s², N_UE_TA: %fms, drift: %fµs/s\n",
ntn_ta->epoch_sfn,
ntn_ta->epoch_subframe,
ntn_ta->cell_specific_k_offset,
ntn_ta->N_common_ta_adj,
ntn_ta->N_common_ta_drift,
ntn_ta->N_common_ta_drift_variant,
ntn_ta->N_UE_TA_adj,
ntn_ta->N_UE_TA_drift);
}

2
openair2/LAYER2/NR_MAC_UE/mac_defs.h
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@@ -533,6 +533,8 @@ typedef struct ntn_timing_advance_components {
double N_common_ta_adj;
// drift rate of common ta in µs/s
double N_common_ta_drift;
// change rate of common ta drift in µs/s²
double N_common_ta_drift_variant;
// N_UE_TA_adj calculated round-trip-time between UE and SAT (ms)
double N_UE_TA_adj;
// drift rate of N_UE_TA in µs/s

1
openair2/LAYER2/NR_MAC_UE/nr_ue_scheduler.c
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@@ -2849,6 +2849,7 @@ static void schedule_ntn_config_command(fapi_nr_dl_config_request_t *dl_config,
ntn_config_command_pdu->cell_specific_k_offset = mac->ntn_ta.cell_specific_k_offset;
ntn_config_command_pdu->ntn_total_time_advance_ms = get_total_TA_ms(&mac->ntn_ta);
ntn_config_command_pdu->ntn_total_time_advance_drift = get_total_TA_drift(&mac->ntn_ta);
ntn_config_command_pdu->ntn_total_time_advance_drift_variant = mac->ntn_ta.N_common_ta_drift_variant;
dl_config->dl_config_list[dl_config->number_pdus].pdu_type = FAPI_NR_DL_NTN_CONFIG_PARAMS;
dl_config->number_pdus += 1;