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RRC: check for DU MIB1/SIB and handle accordingly

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For LiteOn DU, we do not receive the MIB/SIB1 in the F1 Setup Request.
This is not a problem in itself, but it might happen that certain
procedures are executed without MIB/SIB1. Check for it and handle
appropriately:
- During normal connection establishment, we might not be able to
  calculate measurement config
- During reestablishment, we might not be able to calculate ARFCN SSB
  and cannot do reestablishment; do RRC setup instead.
This commit is contained in:
Robert Schmidt
2024-01-18 15:02:00 +01:00
parent 5ee5224a62
commit 3df31b0e55
1 changed files with 19 additions and 4 deletions
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openair2/RRC/NR/rrc_gNB.c
+19 -4
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@@ -576,8 +576,13 @@ static void rrc_gNB_generate_defaultRRCReconfiguration(const protocol_ctxt_t *co
f1ap_served_cell_info_t *cell_info = &du->setup_req->cell[0].info;
int scs = get_ssb_scs(cell_info);
int band = get_dl_band(cell_info);
uint32_t ssb_arfcn = get_ssb_arfcn(cell_info, du->mib, du->sib1);
NR_MeasConfig_t *measconfig = get_defaultMeasConfig(ssb_arfcn, band, scs);
NR_MeasConfig_t *measconfig = NULL;
if (du->mib != NULL && du->sib1 != NULL) {
/* we cannot calculate the default measurement config without MIB&SIB1, as
* we don't know the DU's SSB ARFCN */
uint32_t ssb_arfcn = get_ssb_arfcn(cell_info, du->mib, du->sib1);
measconfig = get_defaultMeasConfig(ssb_arfcn, band, scs);
}
uint8_t buffer[RRC_BUF_SIZE] = {0};
int size = do_RRCReconfiguration(ue_p,
@@ -1288,12 +1293,22 @@ static void rrc_handle_RRCReestablishmentRequest(gNB_RRC_INST *rrc, sctp_assoc_t
return;
}
rnti_t old_rnti = req->ue_Identity.c_RNTI;
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_get_ue_context_by_rnti(rrc, assoc_id, old_rnti);
/* in case we need to do RRC Setup, give the UE a new random identity */
uint64_t random_value;
fill_random(&random_value, sizeof(random_value));
random_value = random_value & 0x7fffffffff; /* random value is 39 bits */
if (du->mib == NULL || du->sib1 == NULL) {
/* we don't have MIB/SIB1 of the DU, and therefore cannot generate the
* Reestablishment (as we would need the SSB's ARFCN, which we cannot
* compute). So generate RRC Setup instead */
LOG_E(NR_RRC, "Reestablishment request: no MIB/SIB1 of DU present, cannot do reestablishment, force setup request\n");
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);
ue_context_p->ue_context.Srb[1].Active = 1;
rrc_gNB_generate_RRCSetup(0, msg->crnti, ue_context_p, msg->du2cu_rrc_container, msg->du2cu_rrc_container_length);
}
rnti_t old_rnti = req->ue_Identity.c_RNTI;
rrc_gNB_ue_context_t *ue_context_p = rrc_gNB_get_ue_context_by_rnti(rrc, assoc_id, old_rnti);
if (ue_context_p == NULL) {
LOG_E(NR_RRC, "NR_RRCReestablishmentRequest without UE context, fallback to RRC setup\n");
ue_context_p = rrc_gNB_create_ue_context(assoc_id, msg->crnti, rrc, random_value, msg->gNB_DU_ue_id);