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NR UE: correctly apply Doppler and TA for NTN target cell

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Make sure to apply Doppler and TA not directly when receiving the target cell ntn_config,
but apply Doppler just before the initial sync, and the TA after the initial sync when
we have tha actuel cell frame and slot numbers.
This commit is contained in:
Thomas Schlichter
2025-12-19 16:42:52 +01:00
parent 3dcaacb63b
commit 1f8fe224a0
3 changed files with 59 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/LAYER2/NR_MAC_UE/config_ue.c
+8 -3
View File
@@ -327,7 +327,11 @@ static void prepare_ue_sat_ta(const NR_PositionVelocity_r17_t *sat_pos, fapi_nr_
}
// populate ntn_ta structure from mac
static void configure_ntn_ta(fapi_nr_ntn_config_t *ntn_ta, const NR_NTN_Config_r17_t *ntn_Config_r17, int hfn, int frame)
static void configure_ntn_ta(fapi_nr_ntn_config_t *ntn_ta,
const NR_NTN_Config_r17_t *ntn_Config_r17,
int hfn,
int frame,
bool is_targetcell)
{
if (!ntn_Config_r17)
return;
@@ -402,6 +406,7 @@ static void configure_ntn_ta(fapi_nr_ntn_config_t *ntn_ta, const NR_NTN_Config_r
ntn_ta->vel_sat_90 = (position_t){0, 0, 0};
}
ntn_ta->is_targetcell = is_targetcell;
ntn_ta->params_changed = true;
}
@@ -579,7 +584,7 @@ static void config_common_ue(NR_UE_MAC_INST_t *mac, NR_ServingCellConfigCommon_t
// NTN Config
if (scc->ext2) {
UPDATE_IE(mac->sc_info.ntn_Config_r17, scc->ext2->ntn_Config_r17, NR_NTN_Config_r17_t);
configure_ntn_ta(&mac->phy_config.config_req.ntn_config, mac->sc_info.ntn_Config_r17, hfn, frame);
configure_ntn_ta(&mac->phy_config.config_req.ntn_config, mac->sc_info.ntn_Config_r17, hfn, frame, true);
} else {
asn1cFreeStruc(asn_DEF_NR_NTN_Config_r17, mac->sc_info.ntn_Config_r17);
}
@@ -1991,7 +1996,7 @@ void nr_rrc_mac_config_other_sib(module_id_t module_id, NR_SIB19_r17_t *sib19, i
if (sib19) {
// update ntn_Config_r17 with received values
UPDATE_IE(mac->sc_info.ntn_Config_r17, sib19->ntn_Config_r17, NR_NTN_Config_r17_t);
configure_ntn_ta(&mac->phy_config.config_req.ntn_config, mac->sc_info.ntn_Config_r17, hfn, frame);
configure_ntn_ta(&mac->phy_config.config_req.ntn_config, mac->sc_info.ntn_Config_r17, hfn, frame, false);
mac->if_module->phy_config_request(&mac->phy_config);
mac->phy_config.config_req.ntn_config.params_changed = false;
}