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Merge remote-tracking branch 'origin/NR_fix_ssbpos_ho' into integration_2026_w10 (!3929)

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UE: Fix if target cell during handover has SSB at a different offset as in source cell

These changes fixed these observed issues:
- If target cell has a different SSB position compared to source cell during
  ho - sync was not successful.
- RAR does not get decoded if SSB position has changed on the target cell
  compared to source cell.
This commit is contained in:
Jaroslava Fiedlerova
2026-03-04 21:15:46 +01:00
parent 352188fbd3 dafabe381c
commit 9c741e9ccf
8 changed files with 102 additions and 60 deletions
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15
executables/nr-ue.c
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@@ -486,12 +486,13 @@ static int handle_sync_req_from_mac(PHY_VARS_NR_UE *UE)
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;
const fapi_nr_config_request_t *config = &UE->nrUE_config;
const fapi_nr_ue_carrier_config_t *cfg = &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) {
LOG_I(NR_PHY,
"[UE %d] RF frequency change: dl %lu->%lu Hz, ul %lu->%lu Hz (from dl_frequency=%u kHz, target_Nid_cell=%d)\n",
"[UE %d] SYNC REQ: RF frequency change: dl %lu->%lu Hz, ul %lu->%lu Hz (from dl_frequency=%u kHz, target_Nid_cell=%d)\n",
UE->Mod_id,
fp->dl_CarrierFreq,
dl_CarrierFreq,
@@ -505,6 +506,16 @@ static int handle_sync_req_from_mac(PHY_VARS_NR_UE *UE)
init_symbol_rotation(fp);
}
int ssb_start_subcarrier = nr_get_ssb_start_sc(fp->numerology_index,
config->ssb_table.ssb_offset_point_a,
config->ssb_table.ssb_subcarrier_offset,
fp->freq_range);
// SSB location can change during for ex: handover on the target cell
if (ssb_start_subcarrier != fp->ssb_start_subcarrier) {
fp->ssb_start_subcarrier = ssb_start_subcarrier;
LOG_I(NR_PHY, "SYNC REQ: SSB location changed:%d\n", fp->ssb_start_subcarrier);
}
// Apply Doppler based on NTN-Config for target cell
if (UE->nrUE_config.ntn_config.is_targetcell)
apply_ntn_timing_advance_and_doppler(UE, fp, -1);