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NR UE: fix PRACH k1 calculation at MAC when handover

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The k1 for PRACH calculation in config_common_ue() should be the same as in config_common_ue_sa(),
otherwise k1 is wrong when handover to target cell if msg1-FDM not 0 in reconfigurationWithSync.
This commit is contained in:
alexjiao
2026-02-17 17:46:18 +01:00
committed by francescomani
parent 40e61d59a6
commit 9e7822cf1c
1 changed files with 12 additions and 1 deletions
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openair2/LAYER2/NR_MAC_UE/config_ue.c
+12 -1
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@@ -608,6 +608,16 @@ static void config_common_ue(NR_UE_MAC_INST_t *mac, NR_ServingCellConfigCommon_t
cfg->prach_config.num_prach_fd_occasions_list = (fapi_nr_num_prach_fd_occasions_t *)malloc(
cfg->prach_config.num_prach_fd_occasions * sizeof(fapi_nr_num_prach_fd_occasions_t));
// Get UL carrier SCS for PRACH k1 calculation
int ul_carrier_scs;
if (scc->uplinkConfigCommon->frequencyInfoUL
&& scc->uplinkConfigCommon->frequencyInfoUL->scs_SpecificCarrierList.list.count > 0) {
ul_carrier_scs = scc->uplinkConfigCommon->frequencyInfoUL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
} else {
ul_carrier_scs = scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.subcarrierSpacing;
}
for (int i = 0; i < cfg->prach_config.num_prach_fd_occasions; i++) {
fapi_nr_num_prach_fd_occasions_t *prach_fd_occasion = &cfg->prach_config.num_prach_fd_occasions_list[i];
prach_fd_occasion->num_prach_fd_occasions = i;
@@ -616,7 +626,8 @@ static void config_common_ue(NR_UE_MAC_INST_t *mac, NR_ServingCellConfigCommon_t
else
prach_fd_occasion->prach_root_sequence_index = rach_ConfigCommon->prach_RootSequenceIndex.choice.l839;
prach_fd_occasion->k1 = rach_ConfigCommon->rach_ConfigGeneric.msg1_FrequencyStart;
prach_fd_occasion->k1 = rach_ConfigCommon->rach_ConfigGeneric.msg1_FrequencyStart
+ (get_N_RA_RB(cfg->prach_config.prach_sub_c_spacing, ul_carrier_scs) * i);
prach_fd_occasion->prach_zero_corr_conf = rach_ConfigCommon->rach_ConfigGeneric.zeroCorrelationZoneConfig;
prach_fd_occasion->num_root_sequences =
compute_nr_root_seq(rach_ConfigCommon, nb_preambles, frame_type, mac->frequency_range);