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fix(NR_UE): gate half-frame PBCH mirror on caller-provided ssb_period

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is_ssb_in_symbol() read cfg->ssb_table.ssb_period directly, but before the FAPI PHY config request arrives (received_config_request == false) that field is still 0, which it interprets as a 5ms period and enables the half-frame PBCH mirror. get_ssb_index_in_symbol() already assumes the 20ms default period for its frame-periodicity test, so the two disagree and the UE attempts a spurious PBCH decode in the second half-frame (slot 5 for mu=0) before being configured.

Closes: #219
Signed-off-by: ChrisAB <cristianbatrin@gmail.com>
This commit is contained in:
ChrisAB
2026-06-22 16:53:36 +03:00
parent 31eb466a7d
commit dcae0070a6
1 changed files with 9 additions and 5 deletions
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14
openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
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@@ -886,18 +886,22 @@ void pdcch_processing(PHY_VARS_NR_UE *ue, const UE_nr_rxtx_proc_t *proc, nr_phy_
memcpy(ue->phy_sim_rxdataF, rxdataF[0], sizeof(int32_t) * max_nb_symb_pdcch * fp->ofdm_symbol_size);
}
int is_ssb_in_symbol(const PHY_VARS_NR_UE *ue, const int symbIdxInFrame, const int slot, const int ssbMask, const int ssbIndex)
int is_ssb_in_symbol(const PHY_VARS_NR_UE *ue,
const int symbIdxInFrame,
const int slot,
const int ssbMask,
const int ssbIndex,
const int ssb_period)
{
const NR_DL_FRAME_PARMS *fp = &ue->frame_parms;
const fapi_nr_config_request_t *cfg = &ue->nrUE_config;
// Skip if current SSB index is not transmitted
if (!is_ssb_index_transmitted(ue, ssbIndex)) {
return false;
}
const int startPbchSymb = nr_get_ssb_start_symbol(fp, ssbIndex) + 1;
const int startPbchSymbHf = (cfg->ssb_table.ssb_period == 0) ? (startPbchSymb + (fp->slots_per_frame * NR_SYMBOLS_PER_SLOT / 2))
: (fp->slots_per_frame * NR_SYMBOLS_PER_SLOT);
const int startPbchSymbHf = (ssb_period == 0) ? (startPbchSymb + (fp->slots_per_frame * NR_SYMBOLS_PER_SLOT / 2))
: (fp->slots_per_frame * NR_SYMBOLS_PER_SLOT);
// Skip if no SSB in current symbol
if ((symbIdxInFrame >= startPbchSymb && symbIdxInFrame < (startPbchSymb + NB_SYMBOLS_PBCH))
@@ -922,7 +926,7 @@ int get_ssb_index_in_symbol(const PHY_VARS_NR_UE *ue, const int symbIdxInFrame,
// Find the SSB index corresponding to current symbol
for (int ssbIndex = 0; ssbIndex < fp->Lmax; ssbIndex++) {
const int ssbMask = cfg->ssb_table.ssb_mask_list[ssbIndex / 32].ssb_mask;
if (is_ssb_in_symbol(ue, symbIdxInFrame, slot, ssbMask, ssbIndex))
if (is_ssb_in_symbol(ue, symbIdxInFrame, slot, ssbMask, ssbIndex, ssb_period))
return ssbIndex;
}