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openairinterface5g/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
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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 gNB_scheduler_RA.c
* \brief primitives used for random access
* \author Guido Casati
* \date 2019
* \email: guido.casati@iis.fraunhofer.de
* \version
*/
#include "platform_types.h"
/* MAC */
#include "nr_mac_gNB.h"
#include "NR_MAC_gNB/mac_proto.h"
#include "NR_MAC_COMMON/nr_mac_extern.h"
/* Utils */
#include "common/utils/LOG/log.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
#include "common/utils/nr/nr_common.h"
#include "UTIL/OPT/opt.h"
#include "SIMULATION/TOOLS/sim.h" // for taus
#include <executables/softmodem-common.h>
extern RAN_CONTEXT_t RC;
extern const uint8_t nr_slots_per_frame[5];
extern uint16_t sl_ahead;
uint8_t DELTA[4]= {2,3,4,6};
#define MAX_NUMBER_OF_SSB 64
float ssb_per_rach_occasion[8] = {0.125,0.25,0.5,1,2,4,8};
int16_t ssb_index_from_prach(module_id_t module_idP,
frame_t frameP,
sub_frame_t slotP,
uint16_t preamble_index,
uint8_t freq_index,
uint8_t symbol) {
gNB_MAC_INST *gNB = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &gNB->common_channels[0];
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0];
uint8_t config_index = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex;
uint8_t fdm = cfg->prach_config.num_prach_fd_occasions.value;
uint8_t total_RApreambles = MAX_NUM_NR_PRACH_PREAMBLES;
if( scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->totalNumberOfRA_Preambles != NULL)
total_RApreambles = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->totalNumberOfRA_Preambles;
float num_ssb_per_RO = ssb_per_rach_occasion[cfg->prach_config.ssb_per_rach.value];
uint16_t start_symbol_index = 0;
uint8_t mu,N_dur=0,N_t_slot=0,start_symbol = 0, temp_start_symbol = 0, N_RA_slot=0;
uint16_t format,RA_sfn_index = -1;
uint8_t config_period = 1;
uint16_t prach_occasion_id = -1;
uint8_t num_active_ssb = cc->num_active_ssb;
if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing)
mu = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing;
else
mu = scc->downlinkConfigCommon->frequencyInfoDL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
get_nr_prach_info_from_index(config_index,
(int)frameP,
(int)slotP,
scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA,
mu,
cc->frame_type,
&format,
&start_symbol,
&N_t_slot,
&N_dur,
&RA_sfn_index,
&N_RA_slot,
&config_period);
uint8_t index = 0,slot_index = 0;
for (slot_index = 0;slot_index < N_RA_slot; slot_index++) {
if (N_RA_slot <= 1) { //1 PRACH slot in a subframe
if((mu == 1) || (mu == 3))
slot_index = 1; //For scs = 30khz and 120khz
}
for (int i=0; i< N_t_slot; i++) {
temp_start_symbol = (start_symbol + i * N_dur + 14 * slot_index) % 14;
if(symbol == temp_start_symbol) {
start_symbol_index = i;
break;
}
}
}
if (N_RA_slot <= 1) { //1 PRACH slot in a subframe
if((mu == 1) || (mu == 3))
slot_index = 0; //For scs = 30khz and 120khz
}
// prach_occasion_id = subframe_index * N_t_slot * N_RA_slot * fdm + N_RA_slot_index * N_t_slot * fdm + freq_index + fdm * start_symbol_index;
prach_occasion_id = (((frameP % (cc->max_association_period * config_period))/config_period)*cc->total_prach_occasions_per_config_period) +
(RA_sfn_index + slot_index) * N_t_slot * fdm + start_symbol_index * fdm + freq_index;
//one RO is shared by one or more SSB
if(num_ssb_per_RO <= 1 )
index = (int) (prach_occasion_id / (int)(1/num_ssb_per_RO)) % num_active_ssb;
//one SSB have more than one continuous RO
else if ( num_ssb_per_RO > 1) {
index = (prach_occasion_id * (int)num_ssb_per_RO)% num_active_ssb ;
for(int j = 0;j < num_ssb_per_RO;j++) {
if(preamble_index < (((j+1) * total_RApreambles) / num_ssb_per_RO))
index = index + j;
}
}
LOG_D(NR_MAC, "Frame %d, Slot %d: Prach Occasion id = %d ssb per RO = %f number of active SSB %u index = %d fdm %u symbol index %u freq_index %u total_RApreambles %u\n",
frameP, slotP, prach_occasion_id, num_ssb_per_RO, num_active_ssb, index, fdm, start_symbol_index, freq_index, total_RApreambles);
return index;
}
//Compute Total active SSBs and RO available
void find_SSB_and_RO_available(module_id_t module_idP) {
gNB_MAC_INST *gNB = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &gNB->common_channels[0];
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0];
uint8_t config_index = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex;
uint8_t mu,N_dur=0,N_t_slot=0,start_symbol=0,N_RA_slot = 0;
uint16_t format,N_RA_sfn = 0,unused_RA_occasion,repetition = 0;
uint8_t num_active_ssb = 0;
uint8_t max_association_period = 1;
struct NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB *ssb_perRACH_OccasionAndCB_PreamblesPerSSB = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->ssb_perRACH_OccasionAndCB_PreamblesPerSSB;
switch (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->present){
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneEighth:
cc->cb_preambles_per_ssb = 4 * (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneEighth + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneFourth:
cc->cb_preambles_per_ssb = 4 * (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneFourth + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneHalf:
cc->cb_preambles_per_ssb = 4 * (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneHalf + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_one:
cc->cb_preambles_per_ssb = 4 * (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.one + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_two:
cc->cb_preambles_per_ssb = 4 * (ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.two + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_four:
cc->cb_preambles_per_ssb = ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.four;
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_eight:
cc->cb_preambles_per_ssb = ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.eight;
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_sixteen:
cc->cb_preambles_per_ssb = ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.sixteen;
break;
default:
AssertFatal(1 == 0, "Unsupported ssb_perRACH_config %d\n", ssb_perRACH_OccasionAndCB_PreamblesPerSSB->present);
break;
}
if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing)
mu = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing;
else
mu = scc->downlinkConfigCommon->frequencyInfoDL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
// prach is scheduled according to configuration index and tables 6.3.3.2.2 to 6.3.3.2.4
get_nr_prach_occasion_info_from_index(config_index,
scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA,
mu,
cc->frame_type,
&format,
&start_symbol,
&N_t_slot,
&N_dur,
&N_RA_slot,
&N_RA_sfn,
&max_association_period);
float num_ssb_per_RO = ssb_per_rach_occasion[cfg->prach_config.ssb_per_rach.value];
uint8_t fdm = cfg->prach_config.num_prach_fd_occasions.value;
uint64_t L_ssb = (((uint64_t) cfg->ssb_table.ssb_mask_list[0].ssb_mask.value)<<32) | cfg->ssb_table.ssb_mask_list[1].ssb_mask.value ;
uint32_t total_RA_occasions = N_RA_sfn * N_t_slot * N_RA_slot * fdm;
for(int i = 0;i < 64;i++) {
if ((L_ssb >> (63-i)) & 0x01) { // only if the bit of L_ssb at current ssb index is 1
cc->ssb_index[num_active_ssb] = i;
num_active_ssb++;
}
}
cc->total_prach_occasions_per_config_period = total_RA_occasions;
for(int i=1; (1 << (i-1)) <= max_association_period; i++) {
cc->max_association_period = (1 <<(i-1));
total_RA_occasions = total_RA_occasions * cc->max_association_period;
if(total_RA_occasions >= (int) (num_active_ssb/num_ssb_per_RO)) {
repetition = (uint16_t)((total_RA_occasions * num_ssb_per_RO )/num_active_ssb);
break;
}
}
unused_RA_occasion = total_RA_occasions - (int)((num_active_ssb * repetition)/num_ssb_per_RO);
cc->total_prach_occasions = total_RA_occasions - unused_RA_occasion;
cc->num_active_ssb = num_active_ssb;
LOG_D(NR_MAC,
"Total available RO %d, num of active SSB %d: unused RO = %d association_period %u N_RA_sfn %u total_prach_occasions_per_config_period %u\n",
cc->total_prach_occasions,
cc->num_active_ssb,
unused_RA_occasion,
cc->max_association_period,
N_RA_sfn,
cc->total_prach_occasions_per_config_period);
}
void schedule_nr_prach(module_id_t module_idP, frame_t frameP, sub_frame_t slotP)
{
gNB_MAC_INST *gNB = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = gNB->common_channels;
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
nfapi_nr_ul_tti_request_t *UL_tti_req = &RC.nrmac[module_idP]->UL_tti_req_ahead[0][slotP];
nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0];
if (is_nr_UL_slot(scc->tdd_UL_DL_ConfigurationCommon, slotP, cc->frame_type)) {
uint8_t config_index = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.prach_ConfigurationIndex;
uint8_t mu,N_dur,N_t_slot,start_symbol = 0,N_RA_slot;
uint16_t RA_sfn_index = -1;
uint8_t config_period = 1;
uint16_t format;
int slot_index = 0;
uint16_t prach_occasion_id = -1;
if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing)
mu = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg1_SubcarrierSpacing;
else
mu = scc->downlinkConfigCommon->frequencyInfoDL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
int bwp_start = NRRIV2PRBOFFSET(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
uint8_t fdm = cfg->prach_config.num_prach_fd_occasions.value;
// prach is scheduled according to configuration index and tables 6.3.3.2.2 to 6.3.3.2.4
if ( get_nr_prach_info_from_index(config_index,
(int)frameP,
(int)slotP,
scc->downlinkConfigCommon->frequencyInfoDL->absoluteFrequencyPointA,
mu,
cc->frame_type,
&format,
&start_symbol,
&N_t_slot,
&N_dur,
&RA_sfn_index,
&N_RA_slot,
&config_period) ) {
uint16_t format0 = format&0xff; // first column of format from table
uint16_t format1 = (format>>8)&0xff; // second column of format from table
if (N_RA_slot > 1) { //more than 1 PRACH slot in a subframe
if (slotP%2 == 1)
slot_index = 1;
else
slot_index = 0;
}else if (N_RA_slot <= 1) { //1 PRACH slot in a subframe
slot_index = 0;
}
UL_tti_req->SFN = frameP;
UL_tti_req->Slot = slotP;
for (int fdm_index=0; fdm_index < fdm; fdm_index++) { // one structure per frequency domain occasion
for (int td_index=0; td_index<N_t_slot; td_index++) {
prach_occasion_id = (((frameP % (cc->max_association_period * config_period))/config_period) * cc->total_prach_occasions_per_config_period) +
(RA_sfn_index + slot_index) * N_t_slot * fdm + td_index * fdm + fdm_index;
if((prach_occasion_id < cc->total_prach_occasions) && (td_index == 0)){
AssertFatal(UL_tti_req->n_pdus < sizeof(UL_tti_req->pdus_list) / sizeof(UL_tti_req->pdus_list[0]),
"Invalid UL_tti_req->n_pdus %d\n", UL_tti_req->n_pdus);
UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_type = NFAPI_NR_UL_CONFIG_PRACH_PDU_TYPE;
UL_tti_req->pdus_list[UL_tti_req->n_pdus].pdu_size = sizeof(nfapi_nr_prach_pdu_t);
nfapi_nr_prach_pdu_t *prach_pdu = &UL_tti_req->pdus_list[UL_tti_req->n_pdus].prach_pdu;
memset(prach_pdu,0,sizeof(nfapi_nr_prach_pdu_t));
UL_tti_req->n_pdus+=1;
// filling the prach fapi structure
prach_pdu->phys_cell_id = *scc->physCellId;
prach_pdu->num_prach_ocas = N_t_slot;
prach_pdu->prach_start_symbol = start_symbol;
prach_pdu->num_ra = fdm_index;
prach_pdu->num_cs = get_NCS(scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.zeroCorrelationZoneConfig,
format0,
scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->restrictedSetConfig);
LOG_D(NR_MAC, "Frame %d, Slot %d: Prach Occasion id = %u fdm index = %u start symbol = %u slot index = %u subframe index = %u \n",
frameP, slotP,
prach_occasion_id, prach_pdu->num_ra,
prach_pdu->prach_start_symbol,
slot_index, RA_sfn_index);
// SCF PRACH PDU format field does not consider A1/B1 etc. possibilities
// We added 9 = A1/B1 10 = A2/B2 11 A3/B3
if (format1!=0xff) {
switch(format0) {
case 0xa1:
prach_pdu->prach_format = 11;
break;
case 0xa2:
prach_pdu->prach_format = 12;
break;
case 0xa3:
prach_pdu->prach_format = 13;
break;
default:
AssertFatal(1==0,"Only formats A1/B1 A2/B2 A3/B3 are valid for dual format");
}
}
else{
switch(format0) {
case 0:
prach_pdu->prach_format = 0;
break;
case 1:
prach_pdu->prach_format = 1;
break;
case 2:
prach_pdu->prach_format = 2;
break;
case 3:
prach_pdu->prach_format = 3;
break;
case 0xa1:
prach_pdu->prach_format = 4;
break;
case 0xa2:
prach_pdu->prach_format = 5;
break;
case 0xa3:
prach_pdu->prach_format = 6;
break;
case 0xb1:
prach_pdu->prach_format = 7;
break;
case 0xb4:
prach_pdu->prach_format = 8;
break;
case 0xc0:
prach_pdu->prach_format = 9;
break;
case 0xc2:
prach_pdu->prach_format = 10;
break;
default:
AssertFatal(1==0,"Invalid PRACH format");
}
}
}
}
}
// block resources in vrb_map_UL
const NR_RACH_ConfigGeneric_t *rach_ConfigGeneric =
&scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric;
const uint8_t mu_pusch =
scc->uplinkConfigCommon->frequencyInfoUL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
const int16_t N_RA_RB = get_N_RA_RB(cfg->prach_config.prach_sub_c_spacing.value, mu_pusch);
uint16_t *vrb_map_UL = &cc->vrb_map_UL[slotP * MAX_BWP_SIZE];
for (int i = 0; i < N_RA_RB * fdm; ++i)
vrb_map_UL[bwp_start + rach_ConfigGeneric->msg1_FrequencyStart + i] |= SL_to_bitmap(start_symbol, N_t_slot*N_dur);
}
}
}
void nr_schedule_msg2(uint16_t rach_frame, uint16_t rach_slot,
uint16_t *msg2_frame, uint16_t *msg2_slot,
int mu, NR_ServingCellConfigCommon_t *scc,
frame_type_t frame_type,
uint16_t monitoring_slot_period,
uint16_t monitoring_offset,uint8_t beam_index,
uint8_t num_active_ssb,
int16_t *tdd_beam_association, int sl_ahead){
// preferentially we schedule the msg2 in the mixed slot or in the last dl slot
// if they are allowed by search space configuration
uint8_t response_window = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->rach_ConfigGeneric.ra_ResponseWindow;
uint8_t slot_window;
const int n_slots_frame = nr_slots_per_frame[mu];
const NR_TDD_UL_DL_Pattern_t *tdd = scc->tdd_UL_DL_ConfigurationCommon ? &scc->tdd_UL_DL_ConfigurationCommon->pattern1 : NULL;
// number of mixed slot or of last dl slot if there is no mixed slot
uint8_t last_dl_slot_period = n_slots_frame-1;
// lenght of tdd period in slots
uint8_t tdd_period_slot = n_slots_frame;
if (tdd) {
last_dl_slot_period = tdd->nrofDownlinkSymbols == 0? (tdd->nrofDownlinkSlots-1) : tdd->nrofDownlinkSlots;
tdd_period_slot = n_slots_frame/get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
}
else{
if(frame_type == TDD)
AssertFatal(frame_type == FDD, "Dynamic TDD not handled yet\n");
}
switch(response_window){
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl1:
slot_window = 1;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl2:
slot_window = 2;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl4:
slot_window = 4;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl8:
slot_window = 8;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl10:
slot_window = 10;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl20:
slot_window = 20;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl40:
slot_window = 40;
break;
case NR_RACH_ConfigGeneric__ra_ResponseWindow_sl80:
slot_window = 80;
break;
default:
AssertFatal(1==0,"Invalid response window value %d\n",response_window);
}
AssertFatal(slot_window<=nr_slots_per_frame[mu],"Msg2 response window needs to be lower or equal to 10ms");
// slot and frame limit to transmit msg2 according to response window
uint8_t slot_limit = (rach_slot + slot_window)%nr_slots_per_frame[mu];
uint16_t frame_limit = rach_frame + (rach_slot + slot_window)/nr_slots_per_frame[mu];
// computing start of next period
uint8_t start_next_period = rach_slot-(rach_slot%tdd_period_slot)+tdd_period_slot;
int eff_slot = start_next_period + last_dl_slot_period; // initializing scheduling of slot to next mixed (or last dl) slot
// we can't schedule msg2 before sl_ahead since prach
while ((eff_slot-rach_slot)<=sl_ahead) {
eff_slot += tdd_period_slot;
}
int FR = *scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0] >= 257 ? nr_FR2 : nr_FR1;
if (FR==nr_FR2) {
int num_tdd_period = (eff_slot%nr_slots_per_frame[mu])/tdd_period_slot;
while((tdd_beam_association[num_tdd_period]!=-1)&&(tdd_beam_association[num_tdd_period]!=beam_index)) {
eff_slot += tdd_period_slot;
num_tdd_period = (eff_slot % nr_slots_per_frame[mu])/tdd_period_slot;
}
if(tdd_beam_association[num_tdd_period] == -1)
tdd_beam_association[num_tdd_period] = beam_index;
}
*msg2_frame = rach_frame + eff_slot / nr_slots_per_frame[mu];
*msg2_slot = eff_slot % nr_slots_per_frame[mu];
// go to previous slot if the current scheduled slot is beyond the response window
// and if the slot is not among the PDCCH monitored ones (38.213 10.1)
while (*msg2_frame > frame_limit
|| (*msg2_frame == frame_limit && *msg2_slot > slot_limit)
|| ((*msg2_frame * nr_slots_per_frame[mu] + *msg2_slot - monitoring_offset) % monitoring_slot_period != 0)) {
if((frame_type == FDD) || ((*msg2_slot%tdd_period_slot) > 0)) {
if (*msg2_slot==0) {
(*msg2_frame)--;
*msg2_slot = nr_slots_per_frame[mu] - 1;
}
else
(*msg2_slot)--;
}
else
AssertFatal(1==0,"No available DL slot to schedule msg2 has been found");
}
// calculate frame number considering wrap-around
*msg2_frame = *msg2_frame % 1024;
}
void nr_initiate_ra_proc(module_id_t module_idP,
int CC_id,
frame_t frameP,
sub_frame_t slotP,
uint16_t preamble_index,
uint8_t freq_index,
uint8_t symbol,
int16_t timing_offset){
uint8_t ul_carrier_id = 0; // 0 for NUL 1 for SUL
uint16_t msg2_frame, msg2_slot,monitoring_slot_period,monitoring_offset;
gNB_MAC_INST *nr_mac = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &nr_mac->common_channels[CC_id];
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
frame_type_t frame_type = cc->frame_type;
uint8_t total_RApreambles = MAX_NUM_NR_PRACH_PREAMBLES;
uint8_t num_ssb_per_RO = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->present;
int pr_found;
if( scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->totalNumberOfRA_Preambles != NULL)
total_RApreambles = *scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->totalNumberOfRA_Preambles;
if(num_ssb_per_RO > 3) { /*num of ssb per RO >= 1*/
num_ssb_per_RO -= 3;
total_RApreambles = total_RApreambles/num_ssb_per_RO ;
}
for (int i = 0; i < NR_NB_RA_PROC_MAX; i++) {
NR_RA_t *ra = &cc->ra[i];
if (ra->state != RA_IDLE)
continue;
pr_found = 0;
for(int j = 0; j < ra->preambles.num_preambles; j++) {
//check if the preamble received correspond to one of the listed or configured preambles
if (preamble_index == ra->preambles.preamble_list[j]) {
if (ra->rnti == 0 && get_softmodem_params()->nsa)
continue;
pr_found=1;
break;
}
}
if (pr_found == 0) {
continue;
}
uint16_t ra_rnti;
// ra_rnti from 5.1.3 in 38.321
// FK: in case of long PRACH the phone seems to expect the subframe number instead of the slot number here.
if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->prach_RootSequenceIndex.present
== NR_RACH_ConfigCommon__prach_RootSequenceIndex_PR_l839)
ra_rnti = 1 + symbol + (9 /*slotP*/ * 14) + (freq_index * 14 * 80) + (ul_carrier_id * 14 * 80 * 8);
else
ra_rnti = 1 + symbol + (slotP * 14) + (freq_index * 14 * 80) + (ul_carrier_id * 14 * 80 * 8);
// Configure RA BWP
configure_UE_BWP(nr_mac, scc, NULL, ra, NULL);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_INITIATE_RA_PROC, 1);
LOG_D(NR_MAC,
"[gNB %d][RAPROC] CC_id %d Frame %d, Slot %d Initiating RA procedure for preamble index %d\n",
module_idP,
CC_id,
frameP,
slotP,
preamble_index);
uint8_t beam_index = ssb_index_from_prach(module_idP, frameP, slotP, preamble_index, freq_index, symbol);
// the UE sent a RACH either for starting RA procedure or RA procedure failed and UE retries
if (ra->cfra) {
// if the preamble received correspond to one of the listed
if (!(preamble_index == ra->preambles.preamble_list[beam_index])) {
LOG_E(
NR_MAC,
"[gNB %d][RAPROC] FAILURE: preamble %d does not correspond to any of the ones in rach_ConfigDedicated\n",
module_idP,
preamble_index);
continue; // if the PRACH preamble does not correspond to any of the ones sent through RRC abort RA proc
}
}
LOG_D(NR_MAC, "Frame %d, Slot %d: Activating RA process \n", frameP, slotP);
ra->state = Msg2;
ra->timing_offset = timing_offset;
ra->preamble_slot = slotP;
// retrieving ra pdcch monitoring period and offset
find_monitoring_periodicity_offset_common(ra->ra_ss, &monitoring_slot_period, &monitoring_offset);
nr_schedule_msg2(frameP,
slotP,
&msg2_frame,
&msg2_slot,
ra->DL_BWP.scs,
scc,
frame_type,
monitoring_slot_period,
monitoring_offset,
beam_index,
cc->num_active_ssb,
nr_mac->tdd_beam_association,
nr_mac->if_inst->sl_ahead);
ra->Msg2_frame = msg2_frame;
ra->Msg2_slot = msg2_slot;
LOG_D(NR_MAC, "%s() Msg2[%04d%d] SFN/SF:%04d%d\n", __FUNCTION__, ra->Msg2_frame, ra->Msg2_slot, frameP, slotP);
int loop = 0;
if (ra->rnti == 0) { // This condition allows for the usage of a preconfigured rnti for the CFRA
do {
ra->rnti = (taus() % 65518) + 1;
loop++;
} while (loop != 100
&& !((find_nr_UE(&nr_mac->UE_info, ra->rnti) == NULL) && (find_nr_RA_id(module_idP, CC_id, ra->rnti) == -1)
&& ra->rnti >= 1 && ra->rnti <= 65519));
if (loop == 100) {
LOG_E(NR_MAC, "%s:%d:%s: [RAPROC] initialisation random access aborted\n", __FILE__, __LINE__, __FUNCTION__);
abort();
}
}
ra->RA_rnti = ra_rnti;
ra->preamble_index = preamble_index;
ra->beam_id = cc->ssb_index[beam_index];
LOG_I(NR_MAC,
"[gNB %d][RAPROC] CC_id %d Frame %d Activating Msg2 generation in frame %d, slot %d using RA rnti %x SSB, new rnti %04x "
"index %u RA index %d\n",
module_idP,
CC_id,
frameP,
ra->Msg2_frame,
ra->Msg2_slot,
ra->RA_rnti,
ra->rnti,
cc->ssb_index[beam_index],
i);
return;
}
LOG_E(NR_MAC, "[gNB %d][RAPROC] FAILURE: CC_id %d Frame %d initiating RA procedure for preamble index %d\n", module_idP, CC_id, frameP, preamble_index);
VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_INITIATE_RA_PROC, 0);
}
void nr_schedule_RA(module_id_t module_idP, frame_t frameP, sub_frame_t slotP) {
gNB_MAC_INST *mac = RC.nrmac[module_idP];
start_meas(&mac->schedule_ra);
for (int CC_id = 0; CC_id < MAX_NUM_CCs; CC_id++) {
NR_COMMON_channels_t *cc = &mac->common_channels[CC_id];
for (int i = 0; i < NR_NB_RA_PROC_MAX; i++) {
NR_RA_t *ra = &cc->ra[i];
LOG_D(NR_MAC, "RA[state:%d]\n", ra->state);
switch (ra->state) {
case Msg2:
nr_generate_Msg2(module_idP, CC_id, frameP, slotP, ra);
break;
case Msg3_retransmission:
nr_generate_Msg3_retransmission(module_idP, CC_id, frameP, slotP, ra);
break;
case Msg4:
nr_generate_Msg4(module_idP, CC_id, frameP, slotP, ra);
break;
case WAIT_Msg4_ACK:
nr_check_Msg4_Ack(module_idP, CC_id, frameP, slotP, ra);
break;
default:
break;
}
}
}
stop_meas(&mac->schedule_ra);
}
void nr_generate_Msg3_retransmission(module_id_t module_idP, int CC_id, frame_t frame, sub_frame_t slot, NR_RA_t *ra) {
gNB_MAC_INST *nr_mac = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &nr_mac->common_channels[CC_id];
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
NR_UE_UL_BWP_t *ul_bwp = &ra->UL_BWP;
NR_PUSCH_TimeDomainResourceAllocationList_t *pusch_TimeDomainAllocationList = ul_bwp->tdaList;
int mu = ul_bwp->scs;
uint8_t K2 = *pusch_TimeDomainAllocationList->list.array[ra->Msg3_tda_id]->k2;
const int sched_frame = frame + (slot + K2 >= nr_slots_per_frame[mu]);
const int sched_slot = (slot + K2) % nr_slots_per_frame[mu];
if (is_xlsch_in_slot(RC.nrmac[module_idP]->ulsch_slot_bitmap[sched_slot / 64], sched_slot)) {
// beam association for FR2
int16_t *tdd_beam_association = nr_mac->tdd_beam_association;
if (*scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0] >= 257) {
// FR2
const int n_slots_frame = nr_slots_per_frame[mu];
const NR_TDD_UL_DL_Pattern_t *tdd = scc->tdd_UL_DL_ConfigurationCommon ? &scc->tdd_UL_DL_ConfigurationCommon->pattern1 : NULL;
AssertFatal(tdd,"Dynamic TDD not handled yet\n");
uint8_t tdd_period_slot = n_slots_frame/get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
int num_tdd_period = sched_slot/tdd_period_slot;
if((tdd_beam_association[num_tdd_period]!=-1)&&(tdd_beam_association[num_tdd_period]!=ra->beam_id))
return; // can't schedule retransmission in this slot
else
tdd_beam_association[num_tdd_period] = ra->beam_id;
}
int fh = 0;
int startSymbolAndLength = pusch_TimeDomainAllocationList->list.array[ra->Msg3_tda_id]->startSymbolAndLength;
int StartSymbolIndex, NrOfSymbols;
SLIV2SL(startSymbolAndLength, &StartSymbolIndex, &NrOfSymbols);
int mappingtype = pusch_TimeDomainAllocationList->list.array[ra->Msg3_tda_id]->mappingType;
uint16_t *vrb_map_UL = &RC.nrmac[module_idP]->common_channels[CC_id].vrb_map_UL[sched_slot * MAX_BWP_SIZE];
const int BWPSize = NRRIV2BW(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
const int BWPStart = NRRIV2PRBOFFSET(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
int rbStart = 0;
for (int i = 0; (i < ra->msg3_nb_rb) && (rbStart <= (BWPSize - ra->msg3_nb_rb)); i++) {
if (vrb_map_UL[rbStart + BWPStart + i]&SL_to_bitmap(StartSymbolIndex, NrOfSymbols)) {
rbStart += i;
i = 0;
}
}
if (rbStart > (BWPSize - ra->msg3_nb_rb)) {
// cannot find free vrb_map for msg3 retransmission in this slot
return;
}
LOG_I(NR_MAC, "[gNB %d][RAPROC] Frame %d, Slot %d : CC_id %d Scheduling retransmission of Msg3 in (%d,%d)\n",
module_idP, frame, slot, CC_id, sched_frame, sched_slot);
nfapi_nr_ul_tti_request_t *future_ul_tti_req = &RC.nrmac[module_idP]->UL_tti_req_ahead[CC_id][sched_slot];
AssertFatal(future_ul_tti_req->SFN == sched_frame
&& future_ul_tti_req->Slot == sched_slot,
"future UL_tti_req's frame.slot %d.%d does not match PUSCH %d.%d\n",
future_ul_tti_req->SFN,
future_ul_tti_req->Slot,
sched_frame,
sched_slot);
AssertFatal(future_ul_tti_req->n_pdus <
sizeof(future_ul_tti_req->pdus_list) / sizeof(future_ul_tti_req->pdus_list[0]),
"Invalid future_ul_tti_req->n_pdus %d\n", future_ul_tti_req->n_pdus);
future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pdu_type = NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE;
future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pdu_size = sizeof(nfapi_nr_pusch_pdu_t);
nfapi_nr_pusch_pdu_t *pusch_pdu = &future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pusch_pdu;
memset(pusch_pdu, 0, sizeof(nfapi_nr_pusch_pdu_t));
fill_msg3_pusch_pdu(pusch_pdu, scc,
ra->msg3_round,
startSymbolAndLength,
ra->rnti, mu,
BWPSize, BWPStart,
mappingtype, fh,
rbStart, ra->msg3_nb_rb);
future_ul_tti_req->n_pdus += 1;
// generation of DCI 0_0 to schedule msg3 retransmission
NR_SearchSpace_t *ss = ra->ra_ss;
NR_ControlResourceSet_t *coreset = ra->coreset;
AssertFatal(coreset!=NULL,"Coreset cannot be null for RA-Msg3 retransmission\n");
nfapi_nr_ul_dci_request_t *ul_dci_req = &nr_mac->UL_dci_req[CC_id];
const int coresetid = coreset->controlResourceSetId;
nfapi_nr_dl_tti_pdcch_pdu_rel15_t *pdcch_pdu_rel15 = nr_mac->pdcch_pdu_idx[CC_id][coresetid];
if (!pdcch_pdu_rel15) {
nfapi_nr_ul_dci_request_pdus_t *ul_dci_request_pdu = &ul_dci_req->ul_dci_pdu_list[ul_dci_req->numPdus];
memset(ul_dci_request_pdu, 0, sizeof(nfapi_nr_ul_dci_request_pdus_t));
ul_dci_request_pdu->PDUType = NFAPI_NR_DL_TTI_PDCCH_PDU_TYPE;
ul_dci_request_pdu->PDUSize = (uint8_t)(2+sizeof(nfapi_nr_dl_tti_pdcch_pdu));
pdcch_pdu_rel15 = &ul_dci_request_pdu->pdcch_pdu.pdcch_pdu_rel15;
ul_dci_req->numPdus += 1;
nr_configure_pdcch(pdcch_pdu_rel15, coreset, false, &ra->sched_pdcch);
nr_mac->pdcch_pdu_idx[CC_id][coresetid] = pdcch_pdu_rel15;
}
uint8_t aggregation_level;
uint8_t nr_of_candidates;
for (int i=0; i<5; i++) {
// for now taking the lowest value among the available aggregation levels
find_aggregation_candidates(&aggregation_level, &nr_of_candidates, ss, 1<<i);
if(nr_of_candidates>0) break;
}
AssertFatal(nr_of_candidates>0,"nr_of_candidates is 0\n");
int CCEIndex = find_pdcch_candidate(nr_mac,
CC_id,
aggregation_level,
nr_of_candidates,
&ra->sched_pdcch,
coreset,
0);
if (CCEIndex < 0) {
LOG_E(NR_MAC, "%s(): cannot find free CCE for RA RNTI 0x%04x!\n", __func__, ra->rnti);
return;
}
// Fill PDCCH DL DCI PDU
nfapi_nr_dl_dci_pdu_t *dci_pdu = &pdcch_pdu_rel15->dci_pdu[pdcch_pdu_rel15->numDlDci];
pdcch_pdu_rel15->numDlDci++;
dci_pdu->RNTI = ra->rnti;
dci_pdu->ScramblingId = *scc->physCellId;
dci_pdu->ScramblingRNTI = 0;
dci_pdu->AggregationLevel = aggregation_level;
dci_pdu->CceIndex = CCEIndex;
dci_pdu->beta_PDCCH_1_0 = 0;
dci_pdu->powerControlOffsetSS = 1;
dci_pdu_rel15_t uldci_payload;
memset(&uldci_payload, 0, sizeof(uldci_payload));
const NR_SIB1_t *sib1 = cc->sib1 ? cc->sib1->message.choice.c1->choice.systemInformationBlockType1 : NULL;
config_uldci(sib1,
scc,
pusch_pdu,
&uldci_payload,
NULL,
ra->Msg3_tda_id,
ra->msg3_TPC,
&ra->UL_BWP);
fill_dci_pdu_rel15(scc,
ra->CellGroup,
&ra->DL_BWP,
dci_pdu,
&uldci_payload,
NR_UL_DCI_FORMAT_0_0,
NR_RNTI_TC,
pusch_pdu->bwp_size,
ul_bwp->bwp_id,
coreset,
nr_mac->cset0_bwp_size);
// Mark the corresponding RBs as used
fill_pdcch_vrb_map(nr_mac,
CC_id,
&ra->sched_pdcch,
CCEIndex,
aggregation_level);
for (int rb = 0; rb < ra->msg3_nb_rb; rb++) {
vrb_map_UL[rbStart + BWPStart + rb] |= SL_to_bitmap(StartSymbolIndex, NrOfSymbols);
}
// reset state to wait msg3
ra->state = WAIT_Msg3;
ra->Msg3_frame = sched_frame;
ra->Msg3_slot = sched_slot;
}
}
void nr_get_Msg3alloc(module_id_t module_id,
int CC_id,
NR_ServingCellConfigCommon_t *scc,
sub_frame_t current_slot,
frame_t current_frame,
NR_RA_t *ra,
int16_t *tdd_beam_association) {
// msg3 is scheduled in mixed slot in the following TDD period
uint16_t msg3_nb_rb = 8; // sdu has 6 or 8 bytes
frame_type_t frame_type = RC.nrmac[module_id]->common_channels->frame_type;
NR_UE_UL_BWP_t *ul_bwp = &ra->UL_BWP;
int mu = ul_bwp->scs;
int StartSymbolIndex = 0;
int NrOfSymbols = 0;
int startSymbolAndLength = 0;
int abs_slot = 0;
ra->Msg3_tda_id = 16; // initialization to a value above limit
NR_PUSCH_TimeDomainResourceAllocationList_t *pusch_TimeDomainAllocationList = ul_bwp->tdaList;
const NR_TDD_UL_DL_Pattern_t *tdd = scc->tdd_UL_DL_ConfigurationCommon ? &scc->tdd_UL_DL_ConfigurationCommon->pattern1 : NULL;
const int n_slots_frame = nr_slots_per_frame[mu];
uint8_t k2 = 0;
if (frame_type == TDD) {
int msg3_slot = tdd->nrofDownlinkSlots; // first uplink slot
if (tdd->nrofUplinkSymbols > 0 && tdd->nrofUplinkSymbols < 3)
msg3_slot++; // we can't trasmit msg3 in mixed slot if there are less than 3 symbols
const int nb_periods_per_frame = get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
const int nb_slots_per_period = ((1<<mu)*10)/nb_periods_per_frame;
for (int i=0; i<pusch_TimeDomainAllocationList->list.count; i++) {
startSymbolAndLength = pusch_TimeDomainAllocationList->list.array[i]->startSymbolAndLength;
SLIV2SL(startSymbolAndLength, &StartSymbolIndex, &NrOfSymbols);
k2 = *pusch_TimeDomainAllocationList->list.array[i]->k2;
int start_symbol_index,nr_of_symbols;
SLIV2SL(pusch_TimeDomainAllocationList->list.array[i]->startSymbolAndLength, &start_symbol_index, &nr_of_symbols);
LOG_D(NR_MAC,"Checking Msg3 TDA %d : k2 %d, sliv %d,S %d L %d\n",i,(int)k2,(int)pusch_TimeDomainAllocationList->list.array[i]->startSymbolAndLength,start_symbol_index,nr_of_symbols);
// we want to transmit in the uplink symbols of mixed slot or the first uplink slot
abs_slot = (current_slot + k2 + DELTA[mu]);
int temp_slot = abs_slot % nr_slots_per_frame[mu]; // msg3 slot according to 8.3 in 38.213
if ((temp_slot % nb_slots_per_period) == msg3_slot &&
is_xlsch_in_slot(RC.nrmac[module_id]->ulsch_slot_bitmap[temp_slot / 64], temp_slot)) {
ra->Msg3_tda_id = i;
ra->msg3_startsymb = StartSymbolIndex;
ra->msg3_nrsymb = NrOfSymbols;
ra->Msg3_slot = temp_slot;
break;
}
}
AssertFatal(ra->Msg3_tda_id < 16, "Couldn't find an appropriate TD allocation for Msg3\n");
}
else {
ra->Msg3_tda_id = 0;
k2 = *pusch_TimeDomainAllocationList->list.array[0]->k2;
abs_slot = current_slot + k2 + DELTA[mu]; // msg3 slot according to 8.3 in 38.213
ra->Msg3_slot = abs_slot % nr_slots_per_frame[mu];
}
AssertFatal(ra->Msg3_tda_id<16,"Unable to find Msg3 time domain allocation in list\n");
if (n_slots_frame > abs_slot)
ra->Msg3_frame = current_frame;
else
ra->Msg3_frame = (current_frame + (abs_slot / n_slots_frame)) % 1024;
// beam association for FR2
if (*scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0] >= 257) {
AssertFatal(tdd,"Dynamic TDD not handled yet\n");
uint8_t tdd_period_slot = n_slots_frame/get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
int num_tdd_period = ra->Msg3_slot/tdd_period_slot;
if((tdd_beam_association[num_tdd_period]!=-1)&&(tdd_beam_association[num_tdd_period]!=ra->beam_id))
AssertFatal(1==0,"Cannot schedule MSG3\n");
else
tdd_beam_association[num_tdd_period] = ra->beam_id;
}
LOG_D(NR_MAC, "[RAPROC] Msg3 slot %d: current slot %u Msg3 frame %u k2 %u Msg3_tda_id %u\n", ra->Msg3_slot, current_slot, ra->Msg3_frame, k2,ra->Msg3_tda_id);
uint16_t *vrb_map_UL =
&RC.nrmac[module_id]->common_channels[CC_id].vrb_map_UL[ra->Msg3_slot * MAX_BWP_SIZE];
int bwpSize = NRRIV2BW(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
int bwpStart = NRRIV2PRBOFFSET(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
if (bwpSize != ul_bwp->BWPSize || bwpStart != ul_bwp->BWPStart) {
int act_bwp_start = ul_bwp->BWPStart;
int act_bwp_size = ul_bwp->BWPSize;
if (!((bwpStart >= act_bwp_start) && ((bwpStart+bwpSize) <= (act_bwp_start+act_bwp_size))))
bwpStart = act_bwp_start;
}
/* search msg3_nb_rb free RBs */
int rbSize = 0;
int rbStart = 0;
while (rbSize < msg3_nb_rb) {
rbStart += rbSize; /* last iteration rbSize was not enough, skip it */
rbSize = 0;
while (rbStart < bwpSize &&
(vrb_map_UL[rbStart + bwpStart]&SL_to_bitmap(StartSymbolIndex, NrOfSymbols)))
rbStart++;
AssertFatal(rbStart < bwpSize - msg3_nb_rb, "no space to allocate Msg 3 for RA!\n");
while (rbStart + rbSize < bwpSize
&& !(vrb_map_UL[rbStart + bwpStart + rbSize]&SL_to_bitmap(StartSymbolIndex, NrOfSymbols))
&& rbSize < msg3_nb_rb)
rbSize++;
}
ra->msg3_nb_rb = msg3_nb_rb;
ra->msg3_first_rb = rbStart;
ra->msg3_bwp_start = bwpStart;
}
void fill_msg3_pusch_pdu(nfapi_nr_pusch_pdu_t *pusch_pdu,
NR_ServingCellConfigCommon_t *scc,
int round,
int startSymbolAndLength,
rnti_t rnti, int scs,
int bwp_size, int bwp_start,
int mappingtype, int fh,
int msg3_first_rb, int msg3_nb_rb) {
int start_symbol_index,nr_of_symbols;
SLIV2SL(startSymbolAndLength, &start_symbol_index, &nr_of_symbols);
int mcsindex = -1; // init value
pusch_pdu->pdu_bit_map = PUSCH_PDU_BITMAP_PUSCH_DATA;
pusch_pdu->rnti = rnti;
pusch_pdu->handle = 0;
pusch_pdu->bwp_start = bwp_start;
pusch_pdu->bwp_size = bwp_size;
pusch_pdu->subcarrier_spacing = scs;
pusch_pdu->cyclic_prefix = 0;
pusch_pdu->mcs_table = 0;
if (scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->msg3_transformPrecoder == NULL)
pusch_pdu->transform_precoding = 1;
else
pusch_pdu->transform_precoding = 0;
pusch_pdu->data_scrambling_id = *scc->physCellId;
pusch_pdu->nrOfLayers = 1;
pusch_pdu->ul_dmrs_symb_pos = get_l_prime(nr_of_symbols,mappingtype,pusch_dmrs_pos2,pusch_len1,start_symbol_index, scc->dmrs_TypeA_Position);
LOG_D(NR_MAC, "MSG3 start_sym:%d NR Symb:%d mappingtype:%d, ul_dmrs_symb_pos:%x\n", start_symbol_index, nr_of_symbols, mappingtype, pusch_pdu->ul_dmrs_symb_pos);
pusch_pdu->dmrs_config_type = 0;
pusch_pdu->ul_dmrs_scrambling_id = *scc->physCellId; //If provided and the PUSCH is not a msg3 PUSCH, otherwise, L2 should set this to physical cell id.
pusch_pdu->scid = 0; //DMRS sequence initialization [TS38.211, sec 6.4.1.1.1]. Should match what is sent in DCI 0_1, otherwise set to 0.
pusch_pdu->dmrs_ports = 1; // 6.2.2 in 38.214 only port 0 to be used
pusch_pdu->num_dmrs_cdm_grps_no_data = 2; // no data in dmrs symbols as in 6.2.2 in 38.214
pusch_pdu->resource_alloc = 1; //type 1
pusch_pdu->rb_start = msg3_first_rb;
if (msg3_nb_rb > pusch_pdu->bwp_size)
AssertFatal(1==0,"MSG3 allocated number of RBs exceed the BWP size\n");
else
pusch_pdu->rb_size = msg3_nb_rb;
pusch_pdu->vrb_to_prb_mapping = 0;
pusch_pdu->frequency_hopping = fh;
//pusch_pdu->tx_direct_current_location;
//The uplink Tx Direct Current location for the carrier. Only values in the value range of this field between 0 and 3299,
//which indicate the subcarrier index within the carrier corresponding 1o the numerology of the corresponding uplink BWP and value 3300,
//which indicates "Outside the carrier" and value 3301, which indicates "Undetermined position within the carrier" are used. [TS38.331, UplinkTxDirectCurrentBWP IE]
pusch_pdu->uplink_frequency_shift_7p5khz = 0;
//Resource Allocation in time domain
pusch_pdu->start_symbol_index = start_symbol_index;
pusch_pdu->nr_of_symbols = nr_of_symbols;
//Optional Data only included if indicated in pduBitmap
pusch_pdu->pusch_data.rv_index = nr_rv_round_map[round%4];
pusch_pdu->pusch_data.harq_process_id = 0;
pusch_pdu->pusch_data.new_data_indicator = 1;
pusch_pdu->pusch_data.num_cb = 0;
int num_dmrs_symb = 0;
for(int i = start_symbol_index; i < start_symbol_index+nr_of_symbols; i++)
num_dmrs_symb += (pusch_pdu->ul_dmrs_symb_pos >> i) & 1;
int TBS = 0;
while(TBS<7) { // TBS for msg3 is 7 bytes (except for RRCResumeRequest1 currently not implemented)
mcsindex++;
AssertFatal(mcsindex<28,"Exceeding MCS limit for Msg3\n");
int R = nr_get_code_rate_ul(mcsindex,pusch_pdu->mcs_table);
pusch_pdu->target_code_rate = R;
pusch_pdu->qam_mod_order = nr_get_Qm_ul(mcsindex,pusch_pdu->mcs_table);
TBS = nr_compute_tbs(pusch_pdu->qam_mod_order,
R,
pusch_pdu->rb_size,
pusch_pdu->nr_of_symbols,
num_dmrs_symb*12, // nb dmrs set for no data in dmrs symbol
0, //nb_rb_oh
0, // to verify tb scaling
pusch_pdu->nrOfLayers)>>3;
pusch_pdu->mcs_index = mcsindex;
pusch_pdu->pusch_data.tb_size = TBS;
pusch_pdu->maintenance_parms_v3.ldpcBaseGraph = get_BG(TBS<<3,R);
}
}
void nr_add_msg3(module_id_t module_idP, int CC_id, frame_t frameP, sub_frame_t slotP, NR_RA_t *ra, uint8_t *RAR_pdu)
{
gNB_MAC_INST *mac = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &mac->common_channels[CC_id];
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
NR_UE_UL_BWP_t *ul_bwp = &ra->UL_BWP;
if (ra->state == RA_IDLE) {
LOG_W(NR_MAC,"RA is not active for RA %X. skipping msg3 scheduling\n", ra->rnti);
return;
}
const uint16_t mask = SL_to_bitmap(ra->msg3_startsymb, ra->msg3_nrsymb);
uint16_t *vrb_map_UL = &RC.nrmac[module_idP]->common_channels[CC_id].vrb_map_UL[ra->Msg3_slot * MAX_BWP_SIZE];
for (int i = 0; i < ra->msg3_nb_rb; ++i) {
AssertFatal(!(vrb_map_UL[i + ra->msg3_first_rb + ra->msg3_bwp_start] & mask),
"RB %d in %4d.%2d is already taken, cannot allocate Msg3!\n",
i + ra->msg3_first_rb,
ra->Msg3_frame,
ra->Msg3_slot);
vrb_map_UL[i + ra->msg3_first_rb + ra->msg3_bwp_start] |= mask;
}
LOG_D(NR_MAC, "[gNB %d][RAPROC] Frame %d, Slot %d : CC_id %d RA is active, Msg3 in (%d,%d)\n", module_idP, frameP, slotP, CC_id, ra->Msg3_frame, ra->Msg3_slot);
nfapi_nr_ul_tti_request_t *future_ul_tti_req = &RC.nrmac[module_idP]->UL_tti_req_ahead[CC_id][ra->Msg3_slot];
AssertFatal(future_ul_tti_req->SFN == ra->Msg3_frame
&& future_ul_tti_req->Slot == ra->Msg3_slot,
"future UL_tti_req's frame.slot %d.%d does not match PUSCH %d.%d\n",
future_ul_tti_req->SFN,
future_ul_tti_req->Slot,
ra->Msg3_frame,
ra->Msg3_slot);
future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pdu_type = NFAPI_NR_UL_CONFIG_PUSCH_PDU_TYPE;
future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pdu_size = sizeof(nfapi_nr_pusch_pdu_t);
nfapi_nr_pusch_pdu_t *pusch_pdu = &future_ul_tti_req->pdus_list[future_ul_tti_req->n_pdus].pusch_pdu;
memset(pusch_pdu, 0, sizeof(nfapi_nr_pusch_pdu_t));
const int ibwp_size = NRRIV2BW(scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
const int scs = ul_bwp->scs;
const int fh = (ul_bwp->pusch_Config && ul_bwp->pusch_Config->frequencyHopping) ? 1 : 0;
const int startSymbolAndLength = ul_bwp->tdaList->list.array[ra->Msg3_tda_id]->startSymbolAndLength;
const int mappingtype = ul_bwp->tdaList->list.array[ra->Msg3_tda_id]->mappingType;
LOG_D(NR_MAC, "Frame %d, Slot %d Adding Msg3 UL Config Request for (%d,%d) : (%d,%d,%d) for rnti: %d\n",
frameP,
slotP,
ra->Msg3_frame,
ra->Msg3_slot,
ra->msg3_nb_rb,
ra->msg3_first_rb,
ra->msg3_round,
ra->rnti);
fill_msg3_pusch_pdu(pusch_pdu,scc,
ra->msg3_round,
startSymbolAndLength,
ra->rnti, scs,
ibwp_size, ra->msg3_bwp_start,
mappingtype, fh,
ra->msg3_first_rb, ra->msg3_nb_rb);
future_ul_tti_req->n_pdus += 1;
// calling function to fill rar message
nr_fill_rar(module_idP, ra, RAR_pdu, pusch_pdu);
}
void nr_generate_Msg2(module_id_t module_idP, int CC_id, frame_t frameP, sub_frame_t slotP, NR_RA_t *ra) {
gNB_MAC_INST *nr_mac = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &nr_mac->common_channels[CC_id];
NR_UE_DL_BWP_t *dl_bwp = &ra->DL_BWP;
if ((ra->Msg2_frame == frameP) && (ra->Msg2_slot == slotP)) {
int mcsIndex = -1; // initialization value
int rbStart = 0;
int rbSize = 8;
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
NR_SearchSpace_t *ss = ra->ra_ss;
long BWPStart = 0;
long BWPSize = 0;
NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config = NULL;
if(*ss->controlResourceSetId!=0) {
BWPStart = dl_bwp->BWPStart;
BWPSize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
} else {
type0_PDCCH_CSS_config = &nr_mac->type0_PDCCH_CSS_config[ra->beam_id];
BWPStart = type0_PDCCH_CSS_config->cset_start_rb;
BWPSize = type0_PDCCH_CSS_config->num_rbs;
}
// Calculate number of symbols
int time_domain_assignment = get_dl_tda(nr_mac, scc, slotP);
NR_tda_info_t tda_info = nr_get_pdsch_tda_info(dl_bwp,
time_domain_assignment);
NR_ControlResourceSet_t *coreset = ra->coreset;
AssertFatal(coreset!=NULL,"Coreset cannot be null for RA-Msg2\n");
uint16_t *vrb_map = cc[CC_id].vrb_map;
for (int i = 0; (i < rbSize) && (rbStart <= (BWPSize - rbSize)); i++) {
if (vrb_map[BWPStart + rbStart + i]&SL_to_bitmap(tda_info.startSymbolIndex, tda_info.nrOfSymbols)) {
rbStart += i;
i = 0;
}
}
if (rbStart > (BWPSize - rbSize)) {
LOG_E(NR_MAC, "%s(): cannot find free vrb_map for RA RNTI %04x!\n", __func__, ra->RA_rnti);
return;
}
// Checking if the DCI allocation is feasible in current subframe
nfapi_nr_dl_tti_request_body_t *dl_req = &nr_mac->DL_req[CC_id].dl_tti_request_body;
if (dl_req->nPDUs > NFAPI_NR_MAX_DL_TTI_PDUS - 2) {
LOG_I(NR_MAC, "[RAPROC] Subframe %d: FAPI DL structure is full, skip scheduling UE %d\n", slotP, ra->RA_rnti);
return;
}
uint8_t aggregation_level;
uint8_t nr_of_candidates;
for (int i=0; i<5; i++) {
// for now taking the lowest value among the available aggregation levels
find_aggregation_candidates(&aggregation_level, &nr_of_candidates, ss, 1<<i);
if(nr_of_candidates>0) break;
}
AssertFatal(nr_of_candidates>0,"nr_of_candidates is 0\n");
int CCEIndex = find_pdcch_candidate(nr_mac,
CC_id,
aggregation_level,
nr_of_candidates,
&ra->sched_pdcch,
coreset,
0);
if (CCEIndex < 0) {
LOG_E(NR_MAC, "%s(): cannot find free CCE for RA RNTI 0x%04x!\n", __func__, ra->rnti);
return;
}
LOG_D(NR_MAC,"Msg2 startSymbolIndex.nrOfSymbols %d.%d\n",tda_info.startSymbolIndex,tda_info.nrOfSymbols);
// look up the PDCCH PDU for this CC, BWP, and CORESET. If it does not exist, create it. This is especially
// important if we have multiple RAs, and the DLSCH has to reuse them, so we need to mark them
const int coresetid = coreset->controlResourceSetId;
nfapi_nr_dl_tti_pdcch_pdu_rel15_t *pdcch_pdu_rel15 = nr_mac->pdcch_pdu_idx[CC_id][coresetid];
if (!pdcch_pdu_rel15) {
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdcch_pdu = &dl_req->dl_tti_pdu_list[dl_req->nPDUs];
memset(dl_tti_pdcch_pdu, 0, sizeof(nfapi_nr_dl_tti_request_pdu_t));
dl_tti_pdcch_pdu->PDUType = NFAPI_NR_DL_TTI_PDCCH_PDU_TYPE;
dl_tti_pdcch_pdu->PDUSize = (uint8_t)(2 + sizeof(nfapi_nr_dl_tti_pdcch_pdu));
dl_req->nPDUs += 1;
pdcch_pdu_rel15 = &dl_tti_pdcch_pdu->pdcch_pdu.pdcch_pdu_rel15;
nr_configure_pdcch(pdcch_pdu_rel15, coreset, false, &ra->sched_pdcch);
nr_mac->pdcch_pdu_idx[CC_id][coresetid] = pdcch_pdu_rel15;
}
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdsch_pdu = &dl_req->dl_tti_pdu_list[dl_req->nPDUs];
memset((void *)dl_tti_pdsch_pdu,0,sizeof(nfapi_nr_dl_tti_request_pdu_t));
dl_tti_pdsch_pdu->PDUType = NFAPI_NR_DL_TTI_PDSCH_PDU_TYPE;
dl_tti_pdsch_pdu->PDUSize = (uint8_t)(2+sizeof(nfapi_nr_dl_tti_pdsch_pdu));
dl_req->nPDUs+=1;
nfapi_nr_dl_tti_pdsch_pdu_rel15_t *pdsch_pdu_rel15 = &dl_tti_pdsch_pdu->pdsch_pdu.pdsch_pdu_rel15;
LOG_A(NR_MAC,"[gNB %d][RAPROC] CC_id %d Frame %d, slotP %d: Generating RA-Msg2 DCI, rnti 0x%x, state %d, CoreSetType %d\n",
module_idP, CC_id, frameP, slotP, ra->RA_rnti, ra->state,pdcch_pdu_rel15->CoreSetType);
// SCF222: PDU index incremented for each PDSCH PDU sent in TX control message. This is used to associate control
// information to data and is reset every slot.
const int pduindex = nr_mac->pdu_index[CC_id]++;
uint8_t mcsTableIdx = dl_bwp->mcsTableIdx;
NR_pdsch_dmrs_t dmrs_parms = get_dl_dmrs_params(scc,
dl_bwp,
&tda_info,
1);
pdsch_pdu_rel15->pduBitmap = 0;
pdsch_pdu_rel15->rnti = ra->RA_rnti;
pdsch_pdu_rel15->pduIndex = pduindex;
pdsch_pdu_rel15->BWPSize = BWPSize;
pdsch_pdu_rel15->BWPStart = BWPStart;
pdsch_pdu_rel15->SubcarrierSpacing = dl_bwp->scs;
pdsch_pdu_rel15->CyclicPrefix = 0;
pdsch_pdu_rel15->NrOfCodewords = 1;
pdsch_pdu_rel15->mcsTable[0] = mcsTableIdx;
pdsch_pdu_rel15->rvIndex[0] = 0;
pdsch_pdu_rel15->dataScramblingId = *scc->physCellId;
pdsch_pdu_rel15->nrOfLayers = 1;
pdsch_pdu_rel15->transmissionScheme = 0;
pdsch_pdu_rel15->refPoint = 0;
pdsch_pdu_rel15->dmrsConfigType = dmrs_parms.dmrsConfigType;
pdsch_pdu_rel15->dlDmrsScramblingId = *scc->physCellId;
pdsch_pdu_rel15->SCID = 0;
pdsch_pdu_rel15->numDmrsCdmGrpsNoData = dmrs_parms.numDmrsCdmGrpsNoData;
pdsch_pdu_rel15->dmrsPorts = 1;
pdsch_pdu_rel15->resourceAlloc = 1;
pdsch_pdu_rel15->rbStart = rbStart;
pdsch_pdu_rel15->rbSize = rbSize;
pdsch_pdu_rel15->VRBtoPRBMapping = 0;
pdsch_pdu_rel15->StartSymbolIndex = tda_info.startSymbolIndex;
pdsch_pdu_rel15->NrOfSymbols = tda_info.nrOfSymbols;
pdsch_pdu_rel15->dlDmrsSymbPos = dmrs_parms.dl_dmrs_symb_pos;
uint8_t tb_scaling = 0;
int R, Qm;
uint32_t TBS=0;
while(TBS<9) { // min TBS for RAR is 9 bytes
mcsIndex++;
R = nr_get_code_rate_dl(mcsIndex, mcsTableIdx);
Qm = nr_get_Qm_dl(mcsIndex, mcsTableIdx);
TBS = nr_compute_tbs(Qm,
R,
rbSize,
tda_info.nrOfSymbols,
dmrs_parms.N_PRB_DMRS*dmrs_parms.N_DMRS_SLOT,
0, // overhead
tb_scaling, // tb scaling
1)>>3; // layers
pdsch_pdu_rel15->targetCodeRate[0] = R;
pdsch_pdu_rel15->qamModOrder[0] = Qm;
pdsch_pdu_rel15->mcsIndex[0] = mcsIndex;
pdsch_pdu_rel15->TBSize[0] = TBS;
}
int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
int bw_tbslbrm = get_dlbw_tbslbrm(scc_bwpsize, ra->CellGroup);
pdsch_pdu_rel15->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(mcsTableIdx,
bw_tbslbrm,
1);
pdsch_pdu_rel15->maintenance_parms_v3.ldpcBaseGraph = get_BG(TBS<<3,R);
// Fill PDCCH DL DCI PDU
nfapi_nr_dl_dci_pdu_t *dci_pdu = &pdcch_pdu_rel15->dci_pdu[pdcch_pdu_rel15->numDlDci];
pdcch_pdu_rel15->numDlDci++;
dci_pdu->RNTI = ra->RA_rnti;
dci_pdu->ScramblingId = *scc->physCellId;
dci_pdu->ScramblingRNTI = 0;
dci_pdu->AggregationLevel = aggregation_level;
dci_pdu->CceIndex = CCEIndex;
dci_pdu->beta_PDCCH_1_0 = 0;
dci_pdu->powerControlOffsetSS = 1;
dci_pdu_rel15_t dci_payload;
dci_payload.frequency_domain_assignment.val = PRBalloc_to_locationandbandwidth0(pdsch_pdu_rel15->rbSize,
pdsch_pdu_rel15->rbStart,
BWPSize);
LOG_D(NR_MAC,"Msg2 rbSize.rbStart.BWPsize %d.%d.%ld\n",pdsch_pdu_rel15->rbSize,
pdsch_pdu_rel15->rbStart,
BWPSize);
dci_payload.time_domain_assignment.val = time_domain_assignment;
dci_payload.vrb_to_prb_mapping.val = 0;
dci_payload.mcs = pdsch_pdu_rel15->mcsIndex[0];
dci_payload.tb_scaling = tb_scaling;
LOG_D(NR_MAC,
"[RAPROC] DCI type 1 payload: freq_alloc %d (%d,%d,%ld), time_alloc %d, vrb to prb %d, mcs %d tb_scaling %d \n",
dci_payload.frequency_domain_assignment.val,
pdsch_pdu_rel15->rbStart,
pdsch_pdu_rel15->rbSize,
BWPSize,
dci_payload.time_domain_assignment.val,
dci_payload.vrb_to_prb_mapping.val,
dci_payload.mcs,
dci_payload.tb_scaling);
LOG_D(NR_MAC,
"[RAPROC] DCI params: rnti 0x%x, rnti_type %d, dci_format %d coreset params: FreqDomainResource %llx, start_symbol %d n_symb %d\n",
pdcch_pdu_rel15->dci_pdu[0].RNTI,
NR_RNTI_RA,
NR_DL_DCI_FORMAT_1_0,
*(unsigned long long *)pdcch_pdu_rel15->FreqDomainResource,
pdcch_pdu_rel15->StartSymbolIndex,
pdcch_pdu_rel15->DurationSymbols);
fill_dci_pdu_rel15(scc,
ra->CellGroup,
dl_bwp,
&pdcch_pdu_rel15->dci_pdu[pdcch_pdu_rel15->numDlDci - 1],
&dci_payload,
NR_DL_DCI_FORMAT_1_0,
NR_RNTI_RA,
BWPSize,
dl_bwp->bwp_id,
coreset,
nr_mac->cset0_bwp_size);
// DL TX request
nfapi_nr_pdu_t *tx_req = &nr_mac->TX_req[CC_id].pdu_list[nr_mac->TX_req[CC_id].Number_of_PDUs];
// Program UL processing for Msg3
nr_get_Msg3alloc(module_idP, CC_id, scc, slotP, frameP, ra, nr_mac->tdd_beam_association);
nr_add_msg3(module_idP, CC_id, frameP, slotP, ra, (uint8_t *) &tx_req->TLVs[0].value.direct[0]);
if(ra->cfra) {
LOG_D(NR_MAC, "Frame %d, Subframe %d: Setting RA-Msg3 reception (CFRA) for SFN.Slot %d.%d\n", frameP, slotP, ra->Msg3_frame, ra->Msg3_slot);
}
else LOG_D(NR_MAC, "Frame %d, Subframe %d: Setting RA-Msg3 reception (CBRA) for SFN.Slot %d.%d\n", frameP, slotP, ra->Msg3_frame, ra->Msg3_slot);
T(T_GNB_MAC_DL_RAR_PDU_WITH_DATA, T_INT(module_idP), T_INT(CC_id), T_INT(ra->RA_rnti), T_INT(frameP),
T_INT(slotP), T_INT(0), T_BUFFER(&tx_req->TLVs[0].value.direct[0], tx_req->TLVs[0].length));
tx_req->PDU_length = pdsch_pdu_rel15->TBSize[0];
tx_req->PDU_index = pduindex;
tx_req->num_TLV = 1;
tx_req->TLVs[0].length = tx_req->PDU_length + 2;
nr_mac->TX_req[CC_id].SFN = frameP;
nr_mac->TX_req[CC_id].Number_of_PDUs++;
nr_mac->TX_req[CC_id].Slot = slotP;
// Mark the corresponding symbols RBs as used
fill_pdcch_vrb_map(nr_mac,
CC_id,
&ra->sched_pdcch,
CCEIndex,
aggregation_level);
for (int rb = 0; rb < rbSize; rb++) {
vrb_map[BWPStart + rb + rbStart] |= SL_to_bitmap(tda_info.startSymbolIndex, tda_info.nrOfSymbols);
}
ra->state = WAIT_Msg3;
LOG_W(NR_MAC,"[gNB %d][RAPROC] Frame %d, Subframe %d: rnti %04x RA state %d\n", module_idP, frameP, slotP, ra->rnti, ra->state);
}
}
void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_frame_t slotP, NR_RA_t *ra) {
gNB_MAC_INST *nr_mac = RC.nrmac[module_idP];
NR_COMMON_channels_t *cc = &nr_mac->common_channels[CC_id];
NR_UE_DL_BWP_t *dl_bwp = &ra->DL_BWP;
// if it is a DL slot, if the RA is in MSG4 state
if (is_xlsch_in_slot(nr_mac->dlsch_slot_bitmap[slotP / 64], slotP) &&
ra->state == Msg4) {
NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon;
NR_SearchSpace_t *ss = ra->ra_ss;
NR_ControlResourceSet_t *coreset = ra->coreset;
AssertFatal(coreset!=NULL,"Coreset cannot be null for RA-Msg4\n");
rnti_t tc_rnti = ra->rnti;
// If UE is known by the network, C-RNTI to be used instead of TC-RNTI
if(ra->msg3_dcch_dtch) {
ra->rnti = ra->crnti;
}
NR_UE_info_t * UE = find_nr_UE(&nr_mac->UE_info, ra->rnti);
if (!UE) {
LOG_E(NR_MAC,"want to generate Msg4, but rnti %04x not in the table\n", ra->rnti);
return;
}
if(UE->enc_rval.encoded <= 0) return; // need to wait until RRCSetup is encoded
NR_UE_sched_ctrl_t *sched_ctrl = &UE->UE_sched_ctrl;
long BWPStart = 0;
long BWPSize = 0;
NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config = NULL;
if(*ss->controlResourceSetId!=0) {
BWPStart = dl_bwp->BWPStart;
BWPSize = dl_bwp->BWPSize;
} else {
type0_PDCCH_CSS_config = &nr_mac->type0_PDCCH_CSS_config[ra->beam_id];
BWPStart = type0_PDCCH_CSS_config->cset_start_rb;
BWPSize = type0_PDCCH_CSS_config->num_rbs;
}
// get CCEindex, needed also for PUCCH and then later for PDCCH
uint8_t aggregation_level;
uint8_t nr_of_candidates;
for (int i=0; i<5; i++) {
// for now taking the lowest value among the available aggregation levels
find_aggregation_candidates(&aggregation_level, &nr_of_candidates, ss, 1<<i);
if(nr_of_candidates>0) break;
}
AssertFatal(nr_of_candidates>0,"nr_of_candidates is 0\n");
int CCEIndex = find_pdcch_candidate(nr_mac,
CC_id,
aggregation_level,
nr_of_candidates,
&ra->sched_pdcch,
coreset,
0);
if (CCEIndex < 0) {
LOG_E(NR_MAC, "%s(): cannot find free CCE for RA RNTI 0x%04x!\n", __func__, ra->rnti);
return;
}
const int delta_PRI=0;
int r_pucch = nr_get_pucch_resource(coreset, ra->UL_BWP.pucch_Config, CCEIndex);
LOG_D(NR_MAC,"[RAPROC] Msg4 r_pucch %d (CCEIndex %d, nb_of_candidates %d, delta_PRI %d)\n", r_pucch, CCEIndex, nr_of_candidates, delta_PRI);
int alloc = nr_acknack_scheduling(module_idP, UE, frameP, slotP, r_pucch, 1);
if (alloc<0) {
LOG_D(NR_MAC,"Couldn't find a pucch allocation for ack nack (msg4) in frame %d slot %d\n",frameP,slotP);
return;
}
LOG_I(NR_MAC,"Generate msg4, rnti: %04x\n", ra->rnti);
/* get the PID of a HARQ process awaiting retrnasmission, or -1 otherwise */
int current_harq_pid = sched_ctrl->retrans_dl_harq.head;
// HARQ management
if (current_harq_pid < 0) {
AssertFatal(sched_ctrl->available_dl_harq.head >= 0,
"UE context not initialized: no HARQ processes found\n");
current_harq_pid = sched_ctrl->available_dl_harq.head;
remove_front_nr_list(&sched_ctrl->available_dl_harq);
}
NR_UE_harq_t *harq = &sched_ctrl->harq_processes[current_harq_pid];
DevAssert(!harq->is_waiting);
add_tail_nr_list(&sched_ctrl->feedback_dl_harq, current_harq_pid);
harq->is_waiting = true;
ra->harq_pid = current_harq_pid;
// Remove UE associated to TC-RNTI
if(harq->round==0 && ra->msg3_dcch_dtch) {
mac_remove_nr_ue(nr_mac, tc_rnti);
}
NR_sched_pucch_t *pucch = &sched_ctrl->sched_pucch[alloc];
harq->feedback_slot = pucch->ul_slot;
harq->feedback_frame = pucch->frame;
uint8_t *buf = (uint8_t *) harq->transportBlock;
// Bytes to be transmitted
if (harq->round == 0) {
if (ra->msg3_dcch_dtch) {
// If the UE used MSG3 to transfer a DCCH or DTCH message, then contention resolution is successful if the UE receives a PDCCH transmission which has its CRC bits scrambled by the C-RNTI
// Just send padding LCID
ra->mac_pdu_length = 0;
} else {
uint16_t mac_pdu_length = nr_write_ce_dlsch_pdu(module_idP, nr_mac->sched_ctrlCommon, buf, 255, ra->cont_res_id);
LOG_D(NR_MAC,"Encoded contention resolution mac_pdu_length %d\n",mac_pdu_length);
uint8_t buffer[CCCH_SDU_SIZE];
uint8_t mac_subheader_len = sizeof(NR_MAC_SUBHEADER_SHORT);
uint16_t mac_sdu_length = mac_rrc_nr_data_req(module_idP, CC_id, frameP, CCCH, ra->rnti, 1, buffer);
if (mac_sdu_length < 256) {
((NR_MAC_SUBHEADER_SHORT *) &buf[mac_pdu_length])->R = 0;
((NR_MAC_SUBHEADER_SHORT *) &buf[mac_pdu_length])->F = 0;
((NR_MAC_SUBHEADER_SHORT *) &buf[mac_pdu_length])->LCID = DL_SCH_LCID_CCCH;
((NR_MAC_SUBHEADER_SHORT *) &buf[mac_pdu_length])->L = mac_sdu_length;
ra->mac_pdu_length = mac_pdu_length + mac_sdu_length + sizeof(NR_MAC_SUBHEADER_SHORT);
} else {
mac_subheader_len = sizeof(NR_MAC_SUBHEADER_LONG);
((NR_MAC_SUBHEADER_LONG *) &buf[mac_pdu_length])->R = 0;
((NR_MAC_SUBHEADER_LONG *) &buf[mac_pdu_length])->F = 1;
((NR_MAC_SUBHEADER_LONG *) &buf[mac_pdu_length])->LCID = DL_SCH_LCID_CCCH;
((NR_MAC_SUBHEADER_LONG *) &buf[mac_pdu_length])->L = htons(mac_sdu_length);
ra->mac_pdu_length = mac_pdu_length + mac_sdu_length + sizeof(NR_MAC_SUBHEADER_LONG);
}
LOG_I(NR_MAC,"Encoded RRCSetup Piggyback (%d + %d bytes), mac_pdu_length %d\n", mac_sdu_length, mac_subheader_len, ra->mac_pdu_length);
memcpy(&buf[mac_pdu_length + mac_subheader_len], buffer, mac_sdu_length);
}
}
uint8_t time_domain_assignment = get_dl_tda(nr_mac, scc, slotP);
NR_tda_info_t msg4_tda = nr_get_pdsch_tda_info(dl_bwp, time_domain_assignment);
NR_pdsch_dmrs_t dmrs_info = get_dl_dmrs_params(scc,
dl_bwp,
&msg4_tda,
1);
uint8_t mcsTableIdx = dl_bwp->mcsTableIdx;
uint8_t mcsIndex = 0;
int rbStart = 0;
int rbSize = 0;
uint8_t tb_scaling = 0;
uint16_t *vrb_map = cc[CC_id].vrb_map;
// increase PRBs until we get to BWPSize or TBS is bigger than MAC PDU size
do {
if(rbSize < BWPSize)
rbSize++;
else
mcsIndex++;
LOG_D(NR_MAC,"Calling nr_compute_tbs with N_PRB_DMRS %d, N_DMRS_SLOT %d\n",dmrs_info.N_PRB_DMRS,dmrs_info.N_DMRS_SLOT);
harq->tb_size = nr_compute_tbs(nr_get_Qm_dl(mcsIndex, mcsTableIdx),
nr_get_code_rate_dl(mcsIndex, mcsTableIdx),
rbSize, msg4_tda.nrOfSymbols, dmrs_info.N_PRB_DMRS * dmrs_info.N_DMRS_SLOT, 0, tb_scaling,1) >> 3;
} while (harq->tb_size < ra->mac_pdu_length && mcsIndex<=28);
AssertFatal(harq->tb_size >= ra->mac_pdu_length,"Cannot allocate Msg4\n");
int i = 0;
while ((i < rbSize) && (rbStart + rbSize <= BWPSize)) {
if (vrb_map[BWPStart + rbStart + i]&SL_to_bitmap(msg4_tda.startSymbolIndex, msg4_tda.nrOfSymbols)) {
rbStart += i+1;
i = 0;
} else {
i++;
}
}
if (rbStart > (BWPSize - rbSize)) {
LOG_E(NR_MAC, "%s(): cannot find free vrb_map for RNTI %04x!\n", __func__, ra->rnti);
return;
}
// Checking if the DCI allocation is feasible in current subframe
nfapi_nr_dl_tti_request_body_t *dl_req = &nr_mac->DL_req[CC_id].dl_tti_request_body;
if (dl_req->nPDUs > NFAPI_NR_MAX_DL_TTI_PDUS - 2) {
LOG_I(NR_MAC, "[RAPROC] Subframe %d: FAPI DL structure is full, skip scheduling UE %d\n", slotP, ra->rnti);
return;
}
// look up the PDCCH PDU for this CC, BWP, and CORESET. If it does not exist, create it. This is especially
// important if we have multiple RAs, and the DLSCH has to reuse them, so we need to mark them
const int coresetid = coreset->controlResourceSetId;
nfapi_nr_dl_tti_pdcch_pdu_rel15_t *pdcch_pdu_rel15 = nr_mac->pdcch_pdu_idx[CC_id][coresetid];
if (!pdcch_pdu_rel15) {
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdcch_pdu = &dl_req->dl_tti_pdu_list[dl_req->nPDUs];
memset(dl_tti_pdcch_pdu, 0, sizeof(nfapi_nr_dl_tti_request_pdu_t));
dl_tti_pdcch_pdu->PDUType = NFAPI_NR_DL_TTI_PDCCH_PDU_TYPE;
dl_tti_pdcch_pdu->PDUSize = (uint8_t)(2 + sizeof(nfapi_nr_dl_tti_pdcch_pdu));
dl_req->nPDUs += 1;
pdcch_pdu_rel15 = &dl_tti_pdcch_pdu->pdcch_pdu.pdcch_pdu_rel15;
nr_configure_pdcch(pdcch_pdu_rel15, coreset, false, &ra->sched_pdcch);
nr_mac->pdcch_pdu_idx[CC_id][coresetid] = pdcch_pdu_rel15;
}
nfapi_nr_dl_tti_request_pdu_t *dl_tti_pdsch_pdu = &dl_req->dl_tti_pdu_list[dl_req->nPDUs];
memset((void *)dl_tti_pdsch_pdu,0,sizeof(nfapi_nr_dl_tti_request_pdu_t));
dl_tti_pdsch_pdu->PDUType = NFAPI_NR_DL_TTI_PDSCH_PDU_TYPE;
dl_tti_pdsch_pdu->PDUSize = (uint8_t)(2+sizeof(nfapi_nr_dl_tti_pdsch_pdu));
dl_req->nPDUs+=1;
nfapi_nr_dl_tti_pdsch_pdu_rel15_t *pdsch_pdu_rel15 = &dl_tti_pdsch_pdu->pdsch_pdu.pdsch_pdu_rel15;
LOG_A(NR_MAC, "[gNB %d] [RAPROC] CC_id %d Frame %d, slotP %d: Generating RA-Msg4 DCI, state %d\n", module_idP, CC_id, frameP, slotP, ra->state);
// SCF222: PDU index incremented for each PDSCH PDU sent in TX control message. This is used to associate control
// information to data and is reset every slot.
const int pduindex = nr_mac->pdu_index[CC_id]++;
pdsch_pdu_rel15->pduBitmap = 0;
pdsch_pdu_rel15->rnti = ra->rnti;
pdsch_pdu_rel15->pduIndex = pduindex;
pdsch_pdu_rel15->BWPSize = BWPSize;
pdsch_pdu_rel15->BWPStart = BWPStart;
pdsch_pdu_rel15->SubcarrierSpacing = dl_bwp->scs;
pdsch_pdu_rel15->CyclicPrefix = 0;
pdsch_pdu_rel15->NrOfCodewords = 1;
int R = nr_get_code_rate_dl(mcsIndex,mcsTableIdx);
pdsch_pdu_rel15->targetCodeRate[0] = R;
int Qm = nr_get_Qm_dl(mcsIndex, mcsTableIdx);
pdsch_pdu_rel15->qamModOrder[0] = Qm;
pdsch_pdu_rel15->mcsIndex[0] = mcsIndex;
pdsch_pdu_rel15->mcsTable[0] = mcsTableIdx;
pdsch_pdu_rel15->rvIndex[0] = nr_rv_round_map[harq->round%4];
pdsch_pdu_rel15->dataScramblingId = *scc->physCellId;
pdsch_pdu_rel15->nrOfLayers = 1;
pdsch_pdu_rel15->transmissionScheme = 0;
pdsch_pdu_rel15->refPoint = 0;
pdsch_pdu_rel15->dmrsConfigType = dmrs_info.dmrsConfigType;
pdsch_pdu_rel15->dlDmrsScramblingId = *scc->physCellId;
pdsch_pdu_rel15->SCID = 0;
pdsch_pdu_rel15->numDmrsCdmGrpsNoData = dmrs_info.numDmrsCdmGrpsNoData;
pdsch_pdu_rel15->dmrsPorts = 1;
pdsch_pdu_rel15->resourceAlloc = 1;
pdsch_pdu_rel15->rbStart = rbStart;
pdsch_pdu_rel15->rbSize = rbSize;
pdsch_pdu_rel15->VRBtoPRBMapping = 0;
pdsch_pdu_rel15->StartSymbolIndex = msg4_tda.startSymbolIndex;
pdsch_pdu_rel15->NrOfSymbols = msg4_tda.nrOfSymbols;
pdsch_pdu_rel15->dlDmrsSymbPos = dmrs_info.dl_dmrs_symb_pos;
int x_Overhead = 0;
nr_get_tbs_dl(&dl_tti_pdsch_pdu->pdsch_pdu, x_Overhead, pdsch_pdu_rel15->numDmrsCdmGrpsNoData, tb_scaling);
int scc_bwpsize = NRRIV2BW(scc->downlinkConfigCommon->initialDownlinkBWP->genericParameters.locationAndBandwidth, MAX_BWP_SIZE);
int bw_tbslbrm = get_dlbw_tbslbrm(scc_bwpsize, ra->CellGroup);
pdsch_pdu_rel15->maintenance_parms_v3.tbSizeLbrmBytes = nr_compute_tbslbrm(mcsTableIdx,
bw_tbslbrm,
1);
pdsch_pdu_rel15->maintenance_parms_v3.ldpcBaseGraph = get_BG(harq->tb_size<<3,R);
pdsch_pdu_rel15->precodingAndBeamforming.num_prgs=1;
pdsch_pdu_rel15->precodingAndBeamforming.prg_size=275;
pdsch_pdu_rel15->precodingAndBeamforming.dig_bf_interfaces=1;
pdsch_pdu_rel15->precodingAndBeamforming.prgs_list[0].pm_idx = 0;
pdsch_pdu_rel15->precodingAndBeamforming.prgs_list[0].dig_bf_interface_list[0].beam_idx = ra->beam_id;
/* Fill PDCCH DL DCI PDU */
nfapi_nr_dl_dci_pdu_t *dci_pdu = &pdcch_pdu_rel15->dci_pdu[pdcch_pdu_rel15->numDlDci];
pdcch_pdu_rel15->numDlDci++;
dci_pdu->RNTI = ra->rnti;
dci_pdu->ScramblingId = *scc->physCellId;
dci_pdu->ScramblingRNTI = 0;
dci_pdu->AggregationLevel = aggregation_level;
dci_pdu->CceIndex = CCEIndex;
dci_pdu->beta_PDCCH_1_0 = 0;
dci_pdu->powerControlOffsetSS = 1;
dci_pdu_rel15_t dci_payload;
dci_payload.frequency_domain_assignment.val = PRBalloc_to_locationandbandwidth0(pdsch_pdu_rel15->rbSize,
pdsch_pdu_rel15->rbStart,
BWPSize);
dci_payload.format_indicator = 1;
dci_payload.time_domain_assignment.val = time_domain_assignment;
dci_payload.vrb_to_prb_mapping.val = 0;
dci_payload.mcs = pdsch_pdu_rel15->mcsIndex[0];
dci_payload.tb_scaling = tb_scaling;
dci_payload.rv = pdsch_pdu_rel15->rvIndex[0];
dci_payload.harq_pid = current_harq_pid;
dci_payload.ndi = harq->ndi;
dci_payload.dai[0].val = (pucch->dai_c-1)&3;
dci_payload.tpc = sched_ctrl->tpc1; // TPC for PUCCH: table 7.2.1-1 in 38.213
dci_payload.pucch_resource_indicator = delta_PRI; // This is delta_PRI from 9.2.1 in 38.213
dci_payload.pdsch_to_harq_feedback_timing_indicator.val = pucch->timing_indicator;
LOG_D(NR_MAC,
"[RAPROC] DCI 1_0 payload: freq_alloc %d (%d,%d,%d), time_alloc %d, vrb to prb %d, mcs %d tb_scaling %d pucchres %d harqtiming %d\n",
dci_payload.frequency_domain_assignment.val,
pdsch_pdu_rel15->rbStart,
pdsch_pdu_rel15->rbSize,
pdsch_pdu_rel15->BWPSize,
dci_payload.time_domain_assignment.val,
dci_payload.vrb_to_prb_mapping.val,
dci_payload.mcs,
dci_payload.tb_scaling,
dci_payload.pucch_resource_indicator,
dci_payload.pdsch_to_harq_feedback_timing_indicator.val);
LOG_D(NR_MAC,
"[RAPROC] DCI params: rnti 0x%x, rnti_type %d, dci_format %d coreset params: FreqDomainResource %llx, start_symbol %d n_symb %d, BWPsize %d\n",
pdcch_pdu_rel15->dci_pdu[0].RNTI,
NR_RNTI_TC,
NR_DL_DCI_FORMAT_1_0,
(unsigned long long)pdcch_pdu_rel15->FreqDomainResource,
pdcch_pdu_rel15->StartSymbolIndex,
pdcch_pdu_rel15->DurationSymbols,
pdsch_pdu_rel15->BWPSize);
fill_dci_pdu_rel15(scc,
ra->CellGroup,
dl_bwp,
&pdcch_pdu_rel15->dci_pdu[pdcch_pdu_rel15->numDlDci - 1],
&dci_payload,
NR_DL_DCI_FORMAT_1_0,
NR_RNTI_TC,
pdsch_pdu_rel15->BWPSize,
dl_bwp->bwp_id,
coreset,
nr_mac->cset0_bwp_size);
// Add padding header and zero rest out if there is space left
if (ra->mac_pdu_length < harq->tb_size) {
NR_MAC_SUBHEADER_FIXED *padding = (NR_MAC_SUBHEADER_FIXED *) &buf[ra->mac_pdu_length];
padding->R = 0;
padding->LCID = DL_SCH_LCID_PADDING;
for(int k = ra->mac_pdu_length+1; k<harq->tb_size; k++) {
buf[k] = 0;
}
}
T(T_GNB_MAC_DL_PDU_WITH_DATA, T_INT(module_idP), T_INT(CC_id), T_INT(ra->rnti),
T_INT(frameP), T_INT(slotP), T_INT(current_harq_pid), T_BUFFER(harq->transportBlock, harq->tb_size));
// DL TX request
nfapi_nr_pdu_t *tx_req = &nr_mac->TX_req[CC_id].pdu_list[nr_mac->TX_req[CC_id].Number_of_PDUs];
memcpy(tx_req->TLVs[0].value.direct, harq->transportBlock, sizeof(uint8_t) * harq->tb_size);
tx_req->PDU_length = harq->tb_size;
tx_req->PDU_index = pduindex;
tx_req->num_TLV = 1;
tx_req->TLVs[0].length = harq->tb_size + 2;
nr_mac->TX_req[CC_id].SFN = frameP;
nr_mac->TX_req[CC_id].Number_of_PDUs++;
nr_mac->TX_req[CC_id].Slot = slotP;
// Mark the corresponding symbols and RBs as used
fill_pdcch_vrb_map(nr_mac,
CC_id,
&ra->sched_pdcch,
CCEIndex,
aggregation_level);
for (int rb = 0; rb < pdsch_pdu_rel15->rbSize; rb++) {
vrb_map[BWPStart + rb + pdsch_pdu_rel15->rbStart] |= SL_to_bitmap(msg4_tda.startSymbolIndex, msg4_tda.nrOfSymbols);
}
LOG_D(NR_MAC,"BWPSize: %i\n", pdcch_pdu_rel15->BWPSize);
LOG_D(NR_MAC,"BWPStart: %i\n", pdcch_pdu_rel15->BWPStart);
LOG_D(NR_MAC,"SubcarrierSpacing: %i\n", pdcch_pdu_rel15->SubcarrierSpacing);
LOG_D(NR_MAC,"CyclicPrefix: %i\n", pdcch_pdu_rel15->CyclicPrefix);
LOG_D(NR_MAC,"StartSymbolIndex: %i\n", pdcch_pdu_rel15->StartSymbolIndex);
LOG_D(NR_MAC,"DurationSymbols: %i\n", pdcch_pdu_rel15->DurationSymbols);
for(int n=0;n<6;n++) LOG_D(NR_MAC,"FreqDomainResource[%i]: %x\n",n, pdcch_pdu_rel15->FreqDomainResource[n]);
LOG_D(NR_MAC,"CceRegMappingType: %i\n", pdcch_pdu_rel15->CceRegMappingType);
LOG_D(NR_MAC,"RegBundleSize: %i\n", pdcch_pdu_rel15->RegBundleSize);
LOG_D(NR_MAC,"InterleaverSize: %i\n", pdcch_pdu_rel15->InterleaverSize);
LOG_D(NR_MAC,"CoreSetType: %i\n", pdcch_pdu_rel15->CoreSetType);
LOG_D(NR_MAC,"ShiftIndex: %i\n", pdcch_pdu_rel15->ShiftIndex);
LOG_D(NR_MAC,"precoderGranularity: %i\n", pdcch_pdu_rel15->precoderGranularity);
LOG_D(NR_MAC,"numDlDci: %i\n", pdcch_pdu_rel15->numDlDci);
if(ra->msg3_dcch_dtch) {
// If the UE used MSG3 to transfer a DCCH or DTCH message, then contention resolution is successful upon transmission of PDCCH
LOG_A(NR_MAC, "(ue rnti 0x%04x) CBRA procedure succeeded!\n", ra->rnti);
nr_clear_ra_proc(module_idP, CC_id, frameP, ra);
UE->Msg3_dcch_dtch = true;
UE->Msg4_ACKed = true;
UE->ra_timer = 0;
remove_front_nr_list(&sched_ctrl->feedback_dl_harq);
harq->feedback_slot = -1;
harq->is_waiting = false;
add_tail_nr_list(&sched_ctrl->available_dl_harq, current_harq_pid);
harq->round = 0;
harq->ndi ^= 1;
sched_ctrl->rrc_processing_timer = 1; // No need to wait at this point in time, setting it to 1 just to enter in function nr_mac_update_timers
LOG_I(NR_MAC, "(%d.%d) Activating RRC processing timer for UE %04x with %d ms\n", frameP, slotP, UE->rnti, 1);
// Reset uplink failure flags/counters/timers at MAC so gNB will resume again scheduling resources for this UE
UE->UE_sched_ctrl.pusch_consecutive_dtx_cnt = 0;
UE->UE_sched_ctrl.ul_failure = 0;
} else {
ra->state = WAIT_Msg4_ACK;
LOG_D(NR_MAC,"[gNB %d][RAPROC] Frame %d, Subframe %d: RA state %d\n", module_idP, frameP, slotP, ra->state);
}
}
}
void nr_check_Msg4_Ack(module_id_t module_id, int CC_id, frame_t frame, sub_frame_t slot, NR_RA_t *ra) {
NR_UE_info_t * UE = find_nr_UE(&RC.nrmac[module_id]->UE_info, ra->rnti);
const int current_harq_pid = ra->harq_pid;
NR_UE_sched_ctrl_t *sched_ctrl = &UE->UE_sched_ctrl;
NR_UE_harq_t *harq = &sched_ctrl->harq_processes[current_harq_pid];
NR_mac_stats_t *stats = &UE->mac_stats;
LOG_D(NR_MAC, "ue rnti 0x%04x, harq is waiting %d, round %d, frame %d %d, harq id %d\n", ra->rnti, harq->is_waiting, harq->round, frame, slot, current_harq_pid);
if (harq->is_waiting == 0) {
if (harq->round == 0) {
if (stats->dl.errors == 0) {
LOG_A(NR_MAC, "(UE RNTI 0x%04x) Received Ack of RA-Msg4. CBRA procedure succeeded!\n", ra->rnti);
UE->Msg4_ACKed = true;
UE->ra_timer = 0;
// Pause scheduling according to:
// 3GPP TS 38.331 Section 12 Table 12.1-1: UE performance requirements for RRC procedures for UEs
const NR_ServingCellConfig_t *servingCellConfig = UE->CellGroup ? UE->CellGroup->spCellConfig->spCellConfigDedicated : NULL;
uint32_t delay_ms = servingCellConfig && servingCellConfig->downlinkBWP_ToAddModList ?
NR_RRC_SETUP_DELAY_MS + NR_RRC_BWP_SWITCHING_DELAY_MS : NR_RRC_SETUP_DELAY_MS;
sched_ctrl->rrc_processing_timer = (delay_ms << ra->DL_BWP.scs);
LOG_I(NR_MAC, "(%d.%d) Activating RRC processing timer for UE %04x with %d ms\n", frame, slot, UE->rnti, delay_ms);
} else {
LOG_I(NR_MAC, "(ue rnti 0x%04x) RA Procedure failed at Msg4!\n", ra->rnti);
}
nr_clear_ra_proc(module_id, CC_id, frame, ra);
if (sched_ctrl->retrans_dl_harq.head >= 0) {
remove_nr_list(&sched_ctrl->retrans_dl_harq, current_harq_pid);
}
} else {
LOG_I(NR_MAC, "(UE %04x) Received Nack of RA-Msg4. Preparing retransmission!\n", ra->rnti);
ra->state = Msg4;
}
}
}
void nr_clear_ra_proc(module_id_t module_idP, int CC_id, frame_t frameP, NR_RA_t *ra){
LOG_D(NR_MAC,"[gNB %d][RAPROC] CC_id %d Frame %d Clear Random access information rnti %x\n", module_idP, CC_id, frameP, ra->rnti);
ra->state = RA_IDLE;
ra->timing_offset = 0;
ra->RRC_timer = 20;
ra->msg3_round = 0;
ra->msg3_dcch_dtch = false;
ra->crnti = 0;
if(ra->cfra == false) {
ra->rnti = 0;
}
}
/////////////////////////////////////
// Random Access Response PDU //
// TS 38.213 ch 8.2 //
// TS 38.321 ch 6.2.3 //
/////////////////////////////////////
//| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |// bit-wise
//| E | T | R A P I D |//
//| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |//
//| R | T A |//
//| T A | UL grant |//
//| UL grant |//
//| UL grant |//
//| UL grant |//
//| T C - R N T I |//
//| T C - R N T I |//
/////////////////////////////////////
// UL grant (27 bits) //
/////////////////////////////////////
//| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |// bit-wise
//|-------------------|FHF|F_alloc|//
//| Freq allocation |//
//| F_alloc |Time allocation|//
//| MCS | TPC |CSI|//
/////////////////////////////////////
// WIP
// todo:
// - handle MAC RAR BI subheader
// - sending only 1 RAR subPDU
// - UL Grant: hardcoded CSI, TPC, time alloc
// - padding
void nr_fill_rar(uint8_t Mod_idP,
NR_RA_t * ra,
uint8_t * dlsch_buffer,
nfapi_nr_pusch_pdu_t *pusch_pdu){
LOG_D(NR_MAC, "[gNB] Generate RAR MAC PDU frame %d slot %d preamble index %u TA command %d \n", ra->Msg2_frame, ra-> Msg2_slot, ra->preamble_index, ra->timing_offset);
NR_RA_HEADER_BI *rarbi = (NR_RA_HEADER_BI *) dlsch_buffer;
NR_RA_HEADER_RAPID *rarh = (NR_RA_HEADER_RAPID *) (dlsch_buffer + 1);
NR_MAC_RAR *rar = (NR_MAC_RAR *) (dlsch_buffer + 2);
unsigned char csi_req = 0, tpc_command;
//uint8_t N_UL_Hop;
uint8_t valid_bits;
uint32_t ul_grant;
uint16_t f_alloc, prb_alloc, bwp_size, truncation=0;
tpc_command = 3; // this is 0 dB
/// E/T/R/R/BI subheader ///
// E = 1, MAC PDU includes another MAC sub-PDU (RAPID)
// T = 0, Back-off indicator subheader
// R = 2, Reserved
// BI = 0, 5ms
rarbi->E = 1;
rarbi->T = 0;
rarbi->R = 0;
rarbi->BI = 0;
/// E/T/RAPID subheader ///
// E = 0, one only RAR, first and last
// T = 1, RAPID
rarh->E = 0;
rarh->T = 1;
rarh->RAPID = ra->preamble_index;
/// RAR MAC payload ///
rar->R = 0;
// TA command
rar->TA1 = (uint8_t) (ra->timing_offset >> 5); // 7 MSBs of timing advance
rar->TA2 = (uint8_t) (ra->timing_offset & 0x1f); // 5 LSBs of timing advance
// TC-RNTI
rar->TCRNTI_1 = (uint8_t) (ra->rnti >> 8); // 8 MSBs of rnti
rar->TCRNTI_2 = (uint8_t) (ra->rnti & 0xff); // 8 LSBs of rnti
// UL grant
ra->msg3_TPC = tpc_command;
bwp_size = pusch_pdu->bwp_size;
prb_alloc = PRBalloc_to_locationandbandwidth0(ra->msg3_nb_rb, ra->msg3_first_rb, bwp_size);
if (bwp_size>180) {
AssertFatal(1==0,"Initial UBWP larger than 180 currently not supported");
}
else {
valid_bits = (uint8_t)ceil(log2(bwp_size*(bwp_size+1)>>1));
}
if (pusch_pdu->frequency_hopping){
AssertFatal(1==0,"PUSCH with frequency hopping currently not supported");
} else {
for (int i=0; i<valid_bits; i++)
truncation |= (1<<i);
f_alloc = (prb_alloc&truncation);
}
ul_grant = csi_req | (tpc_command << 1) | (pusch_pdu->mcs_index << 4) | (ra->Msg3_tda_id << 8) | (f_alloc << 12) | (pusch_pdu->frequency_hopping << 26);
rar->UL_GRANT_1 = (uint8_t) (ul_grant >> 24) & 0x07;
rar->UL_GRANT_2 = (uint8_t) (ul_grant >> 16) & 0xff;
rar->UL_GRANT_3 = (uint8_t) (ul_grant >> 8) & 0xff;
rar->UL_GRANT_4 = (uint8_t) ul_grant & 0xff;
#ifdef DEBUG_RAR
LOG_I(NR_MAC, "rarh->E = 0x%x\n", rarh->E);
LOG_I(NR_MAC, "rarh->T = 0x%x\n", rarh->T);
LOG_I(NR_MAC, "rarh->RAPID = 0x%x (%i)\n", rarh->RAPID, rarh->RAPID);
LOG_I(NR_MAC, "rar->R = 0x%x\n", rar->R);
LOG_I(NR_MAC, "rar->TA1 = 0x%x\n", rar->TA1);
LOG_I(NR_MAC, "rar->TA2 = 0x%x\n", rar->TA2);
LOG_I(NR_MAC, "rar->UL_GRANT_1 = 0x%x\n", rar->UL_GRANT_1);
LOG_I(NR_MAC, "rar->UL_GRANT_2 = 0x%x\n", rar->UL_GRANT_2);
LOG_I(NR_MAC, "rar->UL_GRANT_3 = 0x%x\n", rar->UL_GRANT_3);
LOG_I(NR_MAC, "rar->UL_GRANT_4 = 0x%x\n", rar->UL_GRANT_4);
LOG_I(NR_MAC, "rar->TCRNTI_1 = 0x%x\n", rar->TCRNTI_1);
LOG_I(NR_MAC, "rar->TCRNTI_2 = 0x%x\n", rar->TCRNTI_2);
#endif
int mcs = (unsigned char) (rar->UL_GRANT_4 >> 4);
// time alloc
int Msg3_t_alloc = (unsigned char) (rar->UL_GRANT_3 & 0x07);
// frequency alloc
int Msg3_f_alloc = (uint16_t) ((rar->UL_GRANT_3 >> 4) | (rar->UL_GRANT_2 << 4) | ((rar->UL_GRANT_1 & 0x03) << 12));
// frequency hopping
int freq_hopping = (unsigned char) (rar->UL_GRANT_1 >> 2);
// TA command
int ta_command = rar->TA2 + (rar->TA1 << 5);
// TC-RNTI
int t_crnti = rar->TCRNTI_2 + (rar->TCRNTI_1 << 8);
LOG_D(NR_MAC, "In %s: Transmitted RAR with t_alloc %d f_alloc %d ta_command %d mcs %d freq_hopping %d tpc_command %d csi_req %d t_crnti %x \n",
__FUNCTION__,
Msg3_t_alloc,
Msg3_f_alloc,
ta_command,
mcs,
freq_hopping,
tpc_command,
csi_req,
t_crnti);
}
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