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18c9a3720d2245f3e5a27949de956fdaeebebf4b
openairinterface5g/openair2/LAYER2/NR_MAC_UE/nr_ue_dci_configuration.c
T
Sakthivel Velumani 18c9a3720d Fix asn1c double free 
The UE stores PDCCH search spaces from the network in NR_BWP_PDCCH_t
struct within NR_UE_MAC_INST_t. After storing, the pointers otherSI_SS,
ra_SS and paging_SS are updated to point to the stored SS. Multiple
pointers could point to the same stored SS struct depending on
configuration. Then when the UE wants to release the SS, the pointers
are used to free the stored SS using ASN_STRUCT_RESET(). If multiple
pointers point to the same SS, calling ASN_STRUCT_RESET() on all
pointers would lead to double free. So one needs to check for dangling
pointer before freeing.

Instead of using pointers and assigning them during configuration, we
use SS id for otherSI_SS, ra_SS and paging_SS to retrieve the pointers
whenever needed. When the UE wants to release the SS, we make them -1
indicating an invalid SS id.
2025-04-25 15:40:07 -04:00

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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (the "License"); you may not use this file
* except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.openairinterface.org/?page_id=698
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/* \file nr_ue_dci_configuration.c
* \brief functions for generating dci search procedures based on RRC Serving Cell Group Configuration
* \author R. Knopp, G. Casati
* \date 2020
* \version 0.2
* \company Eurecom, Fraunhofer IIS
* \email: knopp@eurecom.fr, guido.casati@iis.fraunhofer.de
* \note
* \warning
*/
#include "mac_proto.h"
#include "mac_defs.h"
#include "assertions.h"
#include "mac_defs.h"
#include "common/utils/nr/nr_common.h"
#include "executables/softmodem-common.h"
#include <stdio.h>
void fill_dci_search_candidates(const NR_SearchSpace_t *ss, fapi_nr_dl_config_dci_dl_pdu_rel15_t *rel15, const uint32_t Y)
{
LOG_T(NR_MAC_DCI, "Filling search candidates for DCI\n");
int i = 0;
for (int maxL = 16; maxL > 0; maxL >>= 1) {
uint8_t aggregation, max_number_of_candidates;
find_aggregation_candidates(&aggregation,
&max_number_of_candidates,
ss,
maxL);
if (max_number_of_candidates == 0)
continue;
LOG_T(NR_MAC_DCI, "L %d, max number of candidates %d, aggregation %d\n", maxL, max_number_of_candidates, aggregation);
int N_cce_sym = 0; // nb of rbs of coreset per symbol
for (int f = 0; f < 6; f++) {
for (int t = 0; t < 8; t++) {
N_cce_sym += ((rel15->coreset.frequency_domain_resource[f] >> t) & 1);
}
}
int N_cces = N_cce_sym * rel15->coreset.duration;
if (N_cces < aggregation)
continue;
for (int j = 0; j < max_number_of_candidates; j++) {
int first_cce = aggregation * ((Y + ((j * N_cces) / (aggregation * max_number_of_candidates)) + 0) % (N_cces / aggregation));
LOG_T(NR_MAC_DCI,
"Candidate %d of %d first_cce %d (L %d N_cces %d Y %d)\n",
j,
max_number_of_candidates,
first_cce,
aggregation,
N_cces,
Y);
// to avoid storing more than one candidate with the same aggregation and starting CCE (duplicated candidate)
bool duplicated = false;
for (int k = 0; k < i; k++) {
if (rel15->CCE[k] == first_cce && rel15->L[k] == aggregation) {
duplicated = true;
LOG_T(NR_MAC_DCI, "Candidate %d of %d is duplicated\n", j, max_number_of_candidates);
}
}
if (!duplicated) {
rel15->CCE[i] = first_cce;
rel15->L[i] = aggregation;
i++;
}
}
}
rel15->number_of_candidates = i;
}
NR_ControlResourceSet_t *ue_get_coreset(const NR_BWP_PDCCH_t *config, const int coreset_id)
{
if (config->commonControlResourceSet && coreset_id == config->commonControlResourceSet->controlResourceSetId)
return config->commonControlResourceSet;
NR_ControlResourceSet_t *coreset = NULL;
for (int i = 0; i < config->list_Coreset.count; i++) {
if (config->list_Coreset.array[i]->controlResourceSetId == coreset_id) {
coreset = config->list_Coreset.array[i];
break;
}
}
AssertFatal(coreset, "Couldn't find coreset with id %d\n", coreset_id);
return coreset;
}
void config_dci_pdu(NR_UE_MAC_INST_t *mac,
fapi_nr_dl_config_request_t *dl_config,
const int rnti_type,
const int slot,
const NR_SearchSpace_t *ss)
{
const NR_UE_DL_BWP_t *current_DL_BWP = mac->current_DL_BWP;
const NR_UE_UL_BWP_t *current_UL_BWP = mac->current_UL_BWP;
NR_BWP_Id_t dl_bwp_id = current_DL_BWP ? current_DL_BWP->bwp_id : 0;
NR_BWP_PDCCH_t *pdcch_config = &mac->config_BWP_PDCCH[dl_bwp_id];
fapi_nr_dl_config_dci_dl_pdu_rel15_t *rel15 = &dl_config->dl_config_list[dl_config->number_pdus].dci_config_pdu.dci_config_rel15;
const int coreset_id = *ss->controlResourceSetId;
NR_ControlResourceSet_t *coreset;
if(coreset_id > 0) {
coreset = ue_get_coreset(pdcch_config, coreset_id);
rel15->coreset.CoreSetType = NFAPI_NR_CSET_CONFIG_PDCCH_CONFIG;
} else {
coreset = mac->coreset0;
rel15->coreset.CoreSetType = NFAPI_NR_CSET_CONFIG_MIB_SIB1;
}
rel15->coreset.duration = coreset->duration;
for (int i = 0; i < 6; i++)
rel15->coreset.frequency_domain_resource[i] = coreset->frequencyDomainResources.buf[i];
rel15->coreset.CceRegMappingType = coreset->cce_REG_MappingType.present ==
NR_ControlResourceSet__cce_REG_MappingType_PR_interleaved ? FAPI_NR_CCE_REG_MAPPING_TYPE_INTERLEAVED : FAPI_NR_CCE_REG_MAPPING_TYPE_NON_INTERLEAVED;
if (rel15->coreset.CceRegMappingType == FAPI_NR_CCE_REG_MAPPING_TYPE_INTERLEAVED) {
struct NR_ControlResourceSet__cce_REG_MappingType__interleaved *interleaved = coreset->cce_REG_MappingType.choice.interleaved;
rel15->coreset.RegBundleSize = (interleaved->reg_BundleSize == NR_ControlResourceSet__cce_REG_MappingType__interleaved__reg_BundleSize_n6) ? 6 : (2 + interleaved->reg_BundleSize);
rel15->coreset.InterleaverSize = (interleaved->interleaverSize == NR_ControlResourceSet__cce_REG_MappingType__interleaved__interleaverSize_n6) ? 6 : (2 + interleaved->interleaverSize);
rel15->coreset.ShiftIndex = interleaved->shiftIndex != NULL ? *interleaved->shiftIndex : mac->physCellId;
} else {
rel15->coreset.RegBundleSize = 0;
rel15->coreset.InterleaverSize = 0;
rel15->coreset.ShiftIndex = 0;
}
rel15->coreset.precoder_granularity = coreset->precoderGranularity;
// Scrambling RNTI
rel15->coreset.scrambling_rnti = 0;
if (coreset->pdcch_DMRS_ScramblingID) {
rel15->coreset.pdcch_dmrs_scrambling_id = *coreset->pdcch_DMRS_ScramblingID;
if (ss->searchSpaceType->present == NR_SearchSpace__searchSpaceType_PR_ue_Specific)
rel15->coreset.scrambling_rnti = mac->crnti;
} else {
rel15->coreset.pdcch_dmrs_scrambling_id = mac->physCellId;
}
int temp_num_dci_options = (mac->ra.ra_state == nrRA_WAIT_RAR || rnti_type == TYPE_SI_RNTI_) ? 1 : 2;
int dci_format[2] = {0};
if (ss->searchSpaceType->present == NR_SearchSpace__searchSpaceType_PR_ue_Specific) {
if (ss->searchSpaceType->choice.ue_Specific->dci_Formats ==
NR_SearchSpace__searchSpaceType__ue_Specific__dci_Formats_formats0_0_And_1_0) {
dci_format[0] = NR_DL_DCI_FORMAT_1_0;
dci_format[1] = NR_UL_DCI_FORMAT_0_0;
}
else {
dci_format[0] = NR_DL_DCI_FORMAT_1_1;
dci_format[1] = NR_UL_DCI_FORMAT_0_1;
}
}
else { // common
AssertFatal(ss->searchSpaceType->choice.common->dci_Format0_0_AndFormat1_0,
"Only supporting format 10 and 00 for common SS\n");
dci_format[0] = NR_DL_DCI_FORMAT_1_0;
dci_format[1] = NR_UL_DCI_FORMAT_0_0;
}
NR_UE_ServingCell_Info_t *sc_info = &mac->sc_info;
// loop over DCI options and configure resource allocation
// need to configure mac->def_dci_pdu_rel15 for all possible format options
for (int i = 0; i < temp_num_dci_options; i++) {
rel15->ss_type_options[i] = ss->searchSpaceType->present;
if (dci_format[i] == NR_DL_DCI_FORMAT_1_0 || dci_format[i] == NR_UL_DCI_FORMAT_0_0)
rel15->dci_format_options[i] = NFAPI_NR_FORMAT_0_0_AND_1_0;
else
rel15->dci_format_options[i] = NFAPI_NR_FORMAT_0_1_AND_1_1;
uint16_t alt_size = 0;
if(current_DL_BWP) {
// computing alternative size for padding or truncation
dci_pdu_rel15_t temp_pdu;
if (dci_format[i] == NR_DL_DCI_FORMAT_1_0)
alt_size = nr_dci_size(current_DL_BWP,
current_UL_BWP,
sc_info,
mac->pdsch_HARQ_ACK_Codebook,
&temp_pdu,
NR_UL_DCI_FORMAT_0_0,
rnti_type,
coreset,
dl_bwp_id,
ss->searchSpaceType->present,
mac->type0_PDCCH_CSS_config.num_rbs,
0);
if (dci_format[i] == NR_UL_DCI_FORMAT_0_0)
alt_size = nr_dci_size(current_DL_BWP,
current_UL_BWP,
sc_info,
mac->pdsch_HARQ_ACK_Codebook,
&temp_pdu,
NR_DL_DCI_FORMAT_1_0,
rnti_type,
coreset,
dl_bwp_id,
ss->searchSpaceType->present,
mac->type0_PDCCH_CSS_config.num_rbs,
0);
}
uint16_t dci_size = nr_dci_size(current_DL_BWP,
current_UL_BWP,
sc_info,
mac->pdsch_HARQ_ACK_Codebook,
&mac->def_dci_pdu_rel15[dl_config->slot][dci_format[i]],
dci_format[i],
rnti_type,
coreset,
dl_bwp_id,
ss->searchSpaceType->present,
mac->type0_PDCCH_CSS_config.num_rbs,
alt_size);
if (dci_size == 0)
return;
rel15->dci_length_options[i] = dci_size;
}
// DCI 0_0 and 1_0 are same size, L1 just needs to look for 1 option
// L2 decides format based on format indicator in payload
if (rel15->dci_format_options[0] == NFAPI_NR_FORMAT_0_0_AND_1_0)
rel15->num_dci_options = 1;
else
rel15->num_dci_options = 2;
rel15->BWPStart = coreset_id == 0 ? mac->type0_PDCCH_CSS_config.cset_start_rb : current_DL_BWP->BWPStart;
rel15->BWPSize = coreset_id == 0 ? mac->type0_PDCCH_CSS_config.num_rbs : current_DL_BWP->BWPSize;
uint16_t monitoringSymbolsWithinSlot = 0;
int sps = 0;
switch(rnti_type) {
case TYPE_C_RNTI_:
// we use DL BWP dedicated
sps = current_DL_BWP->cyclicprefix ? 12 : 14;
// for SPS=14 8 MSBs in positions 13 down to 6
monitoringSymbolsWithinSlot = (ss->monitoringSymbolsWithinSlot->buf[0]<<(sps-8)) | (ss->monitoringSymbolsWithinSlot->buf[1]>>(16-sps));
rel15->rnti = mac->crnti;
rel15->SubcarrierSpacing = current_DL_BWP->scs;
break;
case TYPE_RA_RNTI_:
// we use the initial DL BWP
sps = current_DL_BWP->cyclicprefix == NULL ? 14 : 12;
monitoringSymbolsWithinSlot = (ss->monitoringSymbolsWithinSlot->buf[0]<<(sps-8)) | (ss->monitoringSymbolsWithinSlot->buf[1]>>(16-sps));
rel15->rnti = mac->ra.ra_rnti;
rel15->SubcarrierSpacing = current_DL_BWP->scs;
break;
case TYPE_MSGB_RNTI_:
// we use the initial DL BWP
sps = current_DL_BWP->cyclicprefix == NULL ? 14 : 12;
monitoringSymbolsWithinSlot =
(ss->monitoringSymbolsWithinSlot->buf[0] << (sps - 8)) | (ss->monitoringSymbolsWithinSlot->buf[1] >> (16 - sps));
rel15->rnti = mac->ra.MsgB_rnti;
rel15->SubcarrierSpacing = current_DL_BWP->scs;
break;
case TYPE_P_RNTI_:
break;
case TYPE_CS_RNTI_:
break;
case TYPE_TC_RNTI_:
// we use the initial DL BWP
sps = current_DL_BWP->cyclicprefix == NULL ? 14 : 12;
monitoringSymbolsWithinSlot = (ss->monitoringSymbolsWithinSlot->buf[0]<<(sps-8)) | (ss->monitoringSymbolsWithinSlot->buf[1]>>(16-sps));
rel15->rnti = mac->ra.t_crnti;
rel15->SubcarrierSpacing = current_DL_BWP->scs;
break;
case TYPE_SP_CSI_RNTI_:
break;
case TYPE_SI_RNTI_:
sps = 14;
// for SPS=14 8 MSBs in positions 13 down to 6
monitoringSymbolsWithinSlot = (ss->monitoringSymbolsWithinSlot->buf[0]<<(sps-8)) | (ss->monitoringSymbolsWithinSlot->buf[1]>>(16-sps));
rel15->rnti = SI_RNTI; // SI-RNTI - 3GPP TS 38.321 Table 7.1-1: RNTI values
rel15->SubcarrierSpacing = mac->mib->subCarrierSpacingCommon;
if(mac->frequency_range == FR2)
rel15->SubcarrierSpacing = mac->mib->subCarrierSpacingCommon + 2;
break;
case TYPE_SFI_RNTI_:
break;
case TYPE_INT_RNTI_:
break;
case TYPE_TPC_PUSCH_RNTI_:
break;
case TYPE_TPC_PUCCH_RNTI_:
break;
case TYPE_TPC_SRS_RNTI_:
break;
default:
break;
}
for (int i = 0; i < sps; i++) {
if ((monitoringSymbolsWithinSlot >> (sps - 1 - i)) & 1) {
rel15->coreset.StartSymbolIndex = i;
break;
}
}
uint32_t Y = 0;
if (ss->searchSpaceType->present == NR_SearchSpace__searchSpaceType_PR_ue_Specific)
Y = get_Y(ss, slot, rel15->rnti);
fill_dci_search_candidates(ss, rel15, Y);
// not scheduling DCI reception if there are no candidates
if (rel15->number_of_candidates == 0) {
LOG_E(NR_MAC, "No candidates in this DCI, not scheduling it");
return;
}
#ifdef DEBUG_DCI
for (int i = 0; i < rel15->num_dci_options; i++) {
LOG_T(NR_MAC_DCI,
"[DCI_CONFIG] Configure DCI PDU: rnti_type %d BWPSize %d BWPStart %d rel15->SubcarrierSpacing %d rel15->dci_format %d "
"rel15->dci_length %d sps %d monitoringSymbolsWithinSlot %d \n",
rnti_type,
rel15->BWPSize,
rel15->BWPStart,
rel15->SubcarrierSpacing,
rel15->dci_format_options[i],
rel15->dci_length_options[i],
sps,
monitoringSymbolsWithinSlot);
}
#endif
// add DCI
dl_config->dl_config_list[dl_config->number_pdus].pdu_type = FAPI_NR_DL_CONFIG_TYPE_DCI;
dl_config->number_pdus += 1;
}
bool is_ss_monitor_occasion(const int frame, const int slot, const int slots_per_frame, const NR_SearchSpace_t *ss)
{
if (!ss)
return false;
const int duration = ss->duration ? *ss->duration : 1;
bool monitor = false;
int period, offset;
get_monitoring_period_offset(ss, &period, &offset);
// The UE monitors PDCCH candidates for search space set ss for 'duration' consecutive slots
for (int i = 0; i < duration; i++) {
if (((frame * slots_per_frame + slot - offset - i) % period) == 0) {
monitor = true;
break;
}
}
return monitor;
}
bool search_space_monitoring_ocasion_other_si(NR_UE_MAC_INST_t *mac,
const NR_SearchSpace_t *ss,
const int abs_slot,
const int frame,
const int slot,
const int slots_per_frame)
{
const int duration = ss->duration ? *ss->duration : 1;
int period, offset;
get_monitoring_period_offset(ss, &period, &offset);
for (int i = 0; i < duration; i++) {
if (((frame * slots_per_frame + slot - offset - i) % period) == 0) {
int N = mac->ssb_list.nb_tx_ssb;
int K = mac->ssb_list.nb_ssb_per_index[mac->mib_ssb];
// numbering current frame and slot in terms of monitoring occasions in window
int rel_slot = abs_slot - mac->si_SchedInfo.si_window_start;
int current_monitor_occasion = (rel_slot % period) + (duration * rel_slot / period);
return current_monitor_occasion % N == K;
}
}
return false;
}
bool is_window_valid(NR_UE_MAC_INST_t *mac, int window_slots, int abs_slot)
{
if (mac->si_SchedInfo.si_window_start == -1) {
// out of window
return false;
} else if (abs_slot > mac->si_SchedInfo.si_window_start + window_slots) {
// window expired
mac->si_SchedInfo.si_window_start = -1;
return false;
}
return true;
}
static bool monitor_dci_for_other_SI(NR_UE_MAC_INST_t *mac,
const NR_SearchSpace_t *ss,
const int si_idx,
const int slots_per_frame,
const int frame,
const int slot)
{
// according to 5.2.2.3.2 in 331
const int abs_slot = frame * slots_per_frame + slot;
si_schedinfo_config_t *config = mac->si_SchedInfo.si_SchedInfo_list.array[si_idx];
int window_slots = 5 << mac->si_SchedInfo.si_WindowLength;
int x = (config->si_WindowPosition - 1) * window_slots;
int T = 8 << config->si_Periodicity; // radio frame periodicity
bool check_valid;
switch (config->type) {
case NR_SI_INFO :
if (mac->si_SchedInfo.si_window_start == -1) {
if ((frame % T) == (x / slots_per_frame) && (x % slots_per_frame == 0))
mac->si_SchedInfo.si_window_start = abs_slot; // in terms of absolute slot number
}
check_valid = is_window_valid(mac, window_slots, abs_slot);
if (check_valid && search_space_monitoring_ocasion_other_si(mac, ss, abs_slot, frame, slot, slots_per_frame))
return true;
break;
case NR_SI_INFO_v1700 :
if (mac->si_SchedInfo.si_window_start == -1) {
if ((frame % T == floor(x / slots_per_frame)) && (slot == x % slots_per_frame))
mac->si_SchedInfo.si_window_start = abs_slot;
}
if (is_window_valid(mac, window_slots, abs_slot))
return search_space_monitoring_ocasion_other_si(mac, ss, abs_slot, frame, slot, slots_per_frame);
break;
default :
AssertFatal(false, "Invalid SI-SchedulingInfo case\n");
}
return false;
}
void ue_dci_configuration(NR_UE_MAC_INST_t *mac, fapi_nr_dl_config_request_t *dl_config, const frame_t frame, const int slot)
{
const NR_UE_DL_BWP_t *current_DL_BWP = mac->current_DL_BWP;
NR_BWP_Id_t dl_bwp_id = current_DL_BWP ? current_DL_BWP->bwp_id : 0;
NR_BWP_PDCCH_t *pdcch_config = &mac->config_BWP_PDCCH[dl_bwp_id];
int scs = current_DL_BWP ? current_DL_BWP->scs : get_softmodem_params()->numerology;
const int slots_per_frame = get_slots_per_frame_from_scs(scs);
if (mac->get_sib1) {
int ssb_sc_offset_norm;
if (mac->ssb_subcarrier_offset < 24 && mac->frequency_range == FR1)
ssb_sc_offset_norm = mac->ssb_subcarrier_offset >> scs;
else
ssb_sc_offset_norm = mac->ssb_subcarrier_offset;
uint16_t ssb_offset_point_a = (mac->ssb_start_subcarrier - ssb_sc_offset_norm) / 12;
int ssb_start_symbol = get_ssb_start_symbol(mac->nr_band, scs, mac->mib_ssb);
get_type0_PDCCH_CSS_config_parameters(&mac->type0_PDCCH_CSS_config,
mac->mib_frame,
mac->mib,
slots_per_frame,
ssb_sc_offset_norm,
ssb_start_symbol,
scs,
mac->frequency_range,
mac->nr_band,
mac->mib_ssb,
1, // If the UE is not configured with a periodicity, the UE assumes a periodicity of a half frame
ssb_offset_point_a);
if (mac->search_space_zero == NULL)
mac->search_space_zero = calloc(1, sizeof(*mac->search_space_zero));
if (mac->coreset0 == NULL)
mac->coreset0 = calloc(1, sizeof(*mac->coreset0));
fill_coresetZero(mac->coreset0, &mac->type0_PDCCH_CSS_config);
fill_searchSpaceZero(mac->search_space_zero, slots_per_frame, &mac->type0_PDCCH_CSS_config);
if (is_ss_monitor_occasion(frame, slot, slots_per_frame, mac->search_space_zero)) {
LOG_D(NR_MAC_DCI, "Monitoring DCI for SIB1 in frame %d slot %d\n", frame, slot);
config_dci_pdu(mac, dl_config, TYPE_SI_RNTI_, slot, mac->search_space_zero);
}
}
for (int i = 0; i < MAX_SI_GROUPS; i++) {
if (!mac->get_otherSI[i])
continue;
// If searchSpaceOtherSystemInformation is set to zero,
// PDCCH monitoring occasions for SI message reception in SI-window
// are same as PDCCH monitoring occasions for SIB1
const NR_SearchSpace_t *ss = get_common_search_space(mac, pdcch_config->otherSI_SS_id == -1 ? 0 : pdcch_config->otherSI_SS_id);
// TODO configure SI-window
if (monitor_dci_for_other_SI(mac, ss, i, slots_per_frame, frame, slot)) {
LOG_D(NR_MAC_DCI, "Monitoring DCI for other SIs in frame %d slot %d\n", frame, slot);
config_dci_pdu(mac, dl_config, TYPE_SI_RNTI_, slot, ss);
}
}
RA_config_t *ra = &mac->ra;
if (mac->state == UE_PERFORMING_RA && ra->ra_state >= nrRA_WAIT_RAR) {
const NR_SearchSpace_t *ra_SS = get_common_search_space(mac, pdcch_config->ra_SS_id);
// if RA is ongoing use RA search space
if (is_ss_monitor_occasion(frame, slot, slots_per_frame, ra_SS)) {
nr_rnti_type_t rnti_type = 0;
if (ra->ra_type == RA_4_STEP) {
rnti_type = ra->ra_state == nrRA_WAIT_RAR ? TYPE_RA_RNTI_ : TYPE_TC_RNTI_;
} else {
rnti_type = TYPE_MSGB_RNTI_;
}
config_dci_pdu(mac, dl_config, rnti_type, slot, ra_SS);
}
} else if (mac->state == UE_CONNECTED) {
for (int i = 0; i < pdcch_config->list_SS.count; i++) {
NR_SearchSpace_t *ss = pdcch_config->list_SS.array[i];
if (is_ss_monitor_occasion(frame, slot, slots_per_frame, ss))
config_dci_pdu(mac, dl_config, TYPE_C_RNTI_, slot, ss);
}
const NR_SearchSpace_t *ra_SS = get_common_search_space(mac, pdcch_config->ra_SS_id);
if (pdcch_config->list_SS.count == 0 && ra_SS) {
// If the UE has not been provided a Type3-PDCCH CSS set or a USS set and
// the UE has received a C-RNTI and has been provided a Type1-PDCCH CSS set,
// the UE monitors PDCCH candidates for DCI format 0_0 and DCI format 1_0
// with CRC scrambled by the C-RNTI in the Type1-PDCCH CSS set
if (is_ss_monitor_occasion(frame, slot, slots_per_frame, ra_SS))
config_dci_pdu(mac, dl_config, TYPE_C_RNTI_, slot, ra_SS);
}
}
}
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