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NR UE: improve initial timing advance calculation from SIB19

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Before, we only considered ta_Common_r17 and the SAT position from SIB19 to compute the initial timing advance value.
This is good enough if the satellite does not move too fast (e.g. GEO satellite).

Now we also consider ta_CommonDrift_r17 and the SAT velocity together with the epoch time from SIB19.
This improves the accuracy of the initial TA computation, esp. for LEO satellite scenarios.
This commit is contained in:
Thomas Schlichter
2025-06-20 11:18:48 +00:00
parent 42bc0d4eb3
commit f1d612c01b
7 changed files with 135 additions and 55 deletions
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openair1/SCHED_NR_UE/fapi_nr_ue_l1.c
+6 -1
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@@ -352,10 +352,15 @@ static void configure_ntn_params(PHY_VARS_NR_UE *ue, fapi_nr_dl_ntn_config_comma
ue->ntn_config_message = CALLOC(1, sizeof(*ue->ntn_config_message));
}
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.epoch_sfn = ntn_params_message->epoch_sfn;
ue->ntn_config_message->ntn_config_params.epoch_subframe = ntn_params_message->epoch_subframe;
ue->ntn_config_message->ntn_config_params.N_common_ta_adj = ntn_params_message->N_common_ta_adj;
ue->ntn_config_message->ntn_config_params.ntn_ta_commondrift = ntn_params_message->ntn_ta_commondrift;
ue->ntn_config_message->ntn_config_params.N_UE_TA_adj = ntn_params_message->N_UE_TA_adj;
ue->ntn_config_message->ntn_config_params.N_UE_TA_drift = ntn_params_message->N_UE_TA_drift;
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->update = true;
}