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Merge remote-tracking branch 'origin/fix_ue_groupB_preambles' into integration_2025_w22 (!3451)

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fix the number of preambles per SSB at UE in case PRACH is configured with groupB

To fix an issue reported in the mailing list related to UE configured by a 3rd
party gNB with groupB PRACH
This commit is contained in:
Jaroslava Fiedlerova
2025-05-27 12:50:54 +02:00
parent b69bc8cb5a f84ec1340c
commit 5dd1bea5da
1 changed files with 2 additions and 5 deletions
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openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
+2 -5
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@@ -336,17 +336,14 @@ static void config_preamble_index(NR_UE_MAC_INST_t *mac)
nb_of_preambles = preamb_ga;
}
}
int rand_preamb = (rand_r(&seed) % ra->ssb_ro_config.preambles_per_ssb);
int pream_per_ssb = min(ra->ssb_ro_config.preambles_per_ssb, nb_of_preambles);
int rand_preamb = rand_r(&seed) % pream_per_ssb;
if (ra->ssb_ro_config.ssb_per_ro < 1)
ra->ra_PreambleIndex = groupOffset + rand_preamb;
else {
int ssb_pr_idx = mac->ssb_list.nb_ssb_per_index[mac->mib_ssb] % (int)ra->ssb_ro_config.ssb_per_ro;
ra->ra_PreambleIndex = groupOffset + (ssb_pr_idx * ra->ssb_ro_config.preambles_per_ssb) + rand_preamb;
}
AssertFatal(ra->ra_PreambleIndex < nb_of_preambles,
"Error! Selected preamble %d which exceeds number of prambles available %d\n",
ra->ra_PreambleIndex,
nb_of_preambles);
}
static void configure_ra_preamble(NR_UE_MAC_INST_t *mac)