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

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Actual problem is that SYNC does not happen on the target cell as frame parameters is not updated
and ssb start carrier is not correct in the UE frame parameters
function nr_get_ssb_start_sc to determine ssb_start_subcarrier
This commit is contained in:
Raghavendra Dinavahi
2026-03-02 15:49:12 +01:00
parent 46b7670672
commit 757a3131a1
6 changed files with 61 additions and 33 deletions
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executables/nr-ue.c
+13 -2
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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);