Merge remote-tracking branch 'origin/NR_multiSSB_initialaccess_fixes' into integration_2022_wk40

openair1/PHY/MODULATION/modulation_UE.h

@@ -57,7 +57,8 @@ int nr_slot_fep_init_sync(PHY_VARS_NR_UE *ue,
                           UE_nr_rxtx_proc_t *proc,
                           unsigned char symbol,
                           unsigned char Ns,
-                          int sample_offset);
+                          int sample_offset,
+                          bool pbch_decoded);
 
 int slot_fep_mbsfn(PHY_VARS_UE *phy_vars_ue,
                    unsigned char l,

openair1/PHY/MODULATION/slot_fep_nr.c

@@ -150,7 +150,8 @@ int nr_slot_fep_init_sync(PHY_VARS_NR_UE *ue,
                           UE_nr_rxtx_proc_t *proc,
                           unsigned char symbol,
                           unsigned char Ns,
-                          int sample_offset)
+                          int sample_offset,
+                          bool pbch_decoded)
 {
   NR_DL_FRAME_PARMS *frame_parms = &ue->frame_parms;
   NR_UE_COMMON *common_vars   = &ue->common_vars;
@@ -160,7 +161,7 @@ int nr_slot_fep_init_sync(PHY_VARS_NR_UE *ue,
 
   unsigned int nb_prefix_samples;
   unsigned int nb_prefix_samples0;
-  if (ue->is_synchronized) {
+  if (pbch_decoded) {
     nb_prefix_samples  = frame_parms->nb_prefix_samples;
     nb_prefix_samples0 = frame_parms->nb_prefix_samples0;
   }

openair1/PHY/NR_UE_ESTIMATION/nr_dl_channel_estimation.c

@@ -1272,8 +1272,8 @@ int nr_pdsch_channel_estimation(PHY_VARS_NR_UE *ue,
   int re_offset = k;
 
 #ifdef DEBUG_PDSCH
-  printf("PDSCH Channel Estimation : ThreadId %d, gNB_id %d ch_offset %d, symbol_offset %d OFDM size %d, Ncp=%d, Ns=%d, k=%d symbol %d\n",proc->thread_id, gNB_id,ch_offset,symbol_offset,ue->frame_parms.ofdm_symbol_size,
-         ue->frame_parms.Ncp,Ns,k, symbol);
+  printf("PDSCH Channel Estimation : ThreadId %d, gNB_id %d ch_offset %d, symbol_offset %d OFDM size %d, Ncp=%d, Ns=%d, k=%d symbol %d\n",
+         proc->thread_id, gNB_id,ch_offset,symbol_offset,ue->frame_parms.ofdm_symbol_size, ue->frame_parms.Ncp,Ns,k, symbol);
 #endif
 
   // generate pilot for gNB port number 1000+p

openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_demodulation.c

@@ -403,7 +403,8 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
 #endif
 
   if (cpumeas(CPUMEAS_GETSTATE))
-    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d first_symbol_flag %d: Channel Level  %5.2f \n",frame,nr_slot_rx,slot,symbol,first_symbol_flag,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
+    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d first_symbol_flag %d: Channel Level  %5.2f \n",
+          frame,nr_slot_rx,slot,symbol,first_symbol_flag,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
 
   //----------------------------------------------------------
   //--------------------- channel compensation ---------------
@@ -428,7 +429,8 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
                                 measurements); // log2_maxh+I0_shift
     stop_meas(&ue->generic_stat_bis[proc->thread_id][slot]);
     if (cpumeas(CPUMEAS_GETSTATE))
-      LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d log2_maxh %d channel_level %d: Channel Comp  %5.2f \n", frame, nr_slot_rx, slot, symbol, pdsch_vars[gNB_id]->log2_maxh, proc->channel_level, ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
+      LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d log2_maxh %d channel_level %d: Channel Comp  %5.2f \n",
+            frame, nr_slot_rx, slot, symbol, pdsch_vars[gNB_id]->log2_maxh, proc->channel_level, ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
 
     start_meas(&ue->generic_stat_bis[proc->thread_id][slot]);
 
@@ -464,7 +466,8 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
   dl_ch_mag_ptr = pdsch_vars[gNB_id_i]->dl_ch_mag0;
   
   if (cpumeas(CPUMEAS_GETSTATE))
-    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d: Channel Combine and zero forcing %5.2f \n",frame,nr_slot_rx,slot,symbol,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
+    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d: Channel Combine and zero forcing %5.2f \n",
+          frame,nr_slot_rx,slot,symbol,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
 
   start_meas(&ue->generic_stat_bis[proc->thread_id][slot]);
   /* Store the valid DL RE's */
@@ -544,7 +547,8 @@ int nr_rx_pdsch(PHY_VARS_NR_UE *ue,
   
   stop_meas(&ue->generic_stat_bis[proc->thread_id][slot]);
   if (cpumeas(CPUMEAS_GETSTATE))
-    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d: LLR Computation  %5.2f \n",frame,nr_slot_rx,slot,symbol,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
+    LOG_D(PHY, "[AbsSFN %u.%d] Slot%d Symbol %d: LLR Computation  %5.2f \n",
+          frame,nr_slot_rx,slot,symbol,ue->generic_stat_bis[proc->thread_id][slot].p_time/(cpuf*1000.0));
   
   // Please keep it: useful for debugging
 #ifdef DEBUG_PDSCH_RX
@@ -1647,7 +1651,6 @@ void nr_dlsch_extract_rbs(int **rxdataF,
           } else {
             int neg_length = frame_parms->ofdm_symbol_size - start_re;
             int pos_length = nb_rb_pdsch * NR_NB_SC_PER_RB - neg_length;
-
             memcpy(rxF_ext, &rxF[start_re], neg_length * sizeof(int32_t));
             memcpy(&rxF_ext[neg_length], rxF, pos_length * sizeof(int32_t));
           }

openair1/PHY/NR_UE_TRANSPORT/nr_dlsch_llr_computation.c

@@ -658,7 +658,7 @@ int nr_dlsch_qpsk_llr(NR_DL_FRAME_PARMS *frame_parms,
     //*llr32 = *rxF;
     llr32->r = rxF->r >> 3;
     llr32->i = rxF->i >> 3;
-    //printf("dlsch_qpsk_llr %d : (%d,%d)\n", i, llr32->r, llr32->i);
+    LOG_D(PHY,"dlsch_qpsk_llr %d : (%d,%d)\n", i, llr32->r, llr32->i);
     rxF++;
     llr32++;
   }

openair1/PHY/NR_UE_TRANSPORT/nr_initial_sync.c

@@ -298,7 +298,8 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
                               proc,
                               i,
                               0,
-                              is*fp->samples_per_frame+ue->ssb_offset);
+                              is*fp->samples_per_frame+ue->ssb_offset,
+                              false);
 
 #ifdef DEBUG_INITIAL_SYNCH
       LOG_I(PHY,"Calling sss detection (normal CP)\n");
@@ -339,6 +340,7 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
       }
 
       if (ret == 0) {
+
         // sync at symbol ue->symbol_offset
         // computing the offset wrt the beginning of the frame
         int mu = fp->numerology_index;
@@ -534,8 +536,8 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
     int32_t pdcch_est_size = ((((fp->symbols_per_slot*(fp->ofdm_symbol_size+LTE_CE_FILTER_LENGTH))+15)/16)*16);
     __attribute__ ((aligned(16))) int32_t pdcch_dl_ch_estimates[4*fp->nb_antennas_rx][pdcch_est_size];
 
-
     for(int n_ss = 0; n_ss<phy_pdcch_config.nb_search_space; n_ss++) {
+      proc->nr_slot_rx = phy_pdcch_config.slot; // setting PDCCH slot to proc
       uint8_t nb_symb_pdcch = phy_pdcch_config.pdcch_config[n_ss].coreset.duration;
       int start_symb = phy_pdcch_config.pdcch_config[n_ss].coreset.StartSymbolIndex;
       for (uint16_t l=start_symb; l<start_symb+nb_symb_pdcch; l++) {
@@ -543,7 +545,8 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
                               proc,
                               l, // the UE PHY has no notion of the symbols to be monitored in the search space
                               phy_pdcch_config.slot,
-                              is*fp->samples_per_frame+phy_pdcch_config.sfn*fp->samples_per_frame+ue->rx_offset);
+                              is*fp->samples_per_frame+phy_pdcch_config.sfn*fp->samples_per_frame+ue->rx_offset,
+                              true);
 
         nr_pdcch_channel_estimation(ue,
                                     proc,
@@ -571,7 +574,8 @@ int nr_initial_sync(UE_nr_rxtx_proc_t *proc,
                                   proc,
                                   m,
                                   phy_pdcch_config.slot,  // same slot and offset as pdcch
-                                  is*fp->samples_per_frame+phy_pdcch_config.sfn*fp->samples_per_frame+ue->rx_offset);
+                                  is*fp->samples_per_frame+phy_pdcch_config.sfn*fp->samples_per_frame+ue->rx_offset,
+                                  true);
           }
 
           int ret = nr_ue_pdsch_procedures(ue,

openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c

@@ -1550,6 +1550,7 @@ void nr_ue_configure_pucch(NR_UE_MAC_INST_t *mac,
 
   LOG_D(NR_MAC,"initial_pucch_id %d, pucch_resource %p\n",pucch->initial_pucch_id,pucch->pucch_resource);
   // configure pucch from Table 9.2.1-1
+  // only for ack/nack
   if (pucch->initial_pucch_id > -1 &&
       pucch->pucch_resource == NULL) {
 
@@ -1582,25 +1583,12 @@ void nr_ue_configure_pucch(NR_UE_MAC_INST_t *mac,
     pucch_pdu->freq_hop_flag = 1;
     pucch_pdu->time_domain_occ_idx = 0;
 
-    if (O_SR == 0 || pucch->sr_payload == 0) {  /* only ack is transmitted TS 36.213 9.2.3 UE procedure for reporting HARQ-ACK */
     if (O_ACK == 1)
       pucch_pdu->mcs = sequence_cyclic_shift_1_harq_ack_bit[pucch->ack_payload & 0x1];   /* only harq of 1 bit */
     else
       pucch_pdu->mcs = sequence_cyclic_shift_2_harq_ack_bits[pucch->ack_payload & 0x3];  /* only harq with 2 bits */
-    }
-    else { /* SR + eventually ack are transmitted TS 36.213 9.2.5.1 UE procedure for multiplexing HARQ-ACK or CSI and SR */
-      if (pucch->sr_payload == 1) {                /* positive scheduling request */
-        if (O_ACK == 1)
-          pucch_pdu->mcs = sequence_cyclic_shift_1_harq_ack_bit_positive_sr[pucch->ack_payload & 0x1];   /* positive SR and harq of 1 bit */
-        else if (O_ACK == 2)
-          pucch_pdu->mcs = sequence_cyclic_shift_2_harq_ack_bits_positive_sr[pucch->ack_payload & 0x3];  /* positive SR and harq with 2 bits */
-        else
-          pucch_pdu->mcs = 0;  /* only positive SR */
-      }
-    }
 
-    // TODO verify if SR can be transmitted in this mode
-    pucch_pdu->payload = (pucch->sr_payload << O_ACK) | pucch->ack_payload;
+    pucch_pdu->payload = pucch->ack_payload;
   }
   else if (pucch->pucch_resource != NULL) {
 

openair2/LAYER2/NR_MAC_gNB/config.c

@@ -512,9 +512,8 @@ int rrc_mac_config_req_gNB(module_id_t Mod_idP,
     int nr_dl_slots = n;
     int nr_ulstart_slot = 0;
     if (tdd) {
-      nr_ulstart_slot = tdd->nrofDownlinkSlots + (tdd->nrofUplinkSymbols == 0);
       nr_dl_slots = tdd->nrofDownlinkSlots + (tdd->nrofDownlinkSymbols != 0);
-      nr_ulstart_slot = tdd->nrofDownlinkSlots + (tdd->nrofUplinkSymbols == 0);
+      nr_ulstart_slot = tdd->nrofDownlinkSlots;
       nr_slots_period /= get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
     }
     else

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c

@@ -636,7 +636,7 @@ void nr_initiate_ra_proc(module_id_t module_idP,
 
     ra->RA_rnti = ra_rnti;
     ra->preamble_index = preamble_index;
-    ra->beam_id = beam_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 "
@@ -886,7 +886,7 @@ void nr_get_Msg3alloc(module_id_t module_id,
   int StartSymbolIndex = 0;
   int NrOfSymbols = 0;
   int startSymbolAndLength = 0;
-  int temp_slot = 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;
@@ -895,8 +895,11 @@ void nr_get_Msg3alloc(module_id_t module_id,
   const int n_slots_frame = nr_slots_per_frame[mu];
   uint8_t k2 = 0;
   if (frame_type == TDD) {
-    int nb_periods_per_frame = get_nb_periods_per_frame(scc->tdd_UL_DL_ConfigurationCommon->pattern1.dl_UL_TransmissionPeriodicity);
-    int nb_slots_per_period = ((1<<mu)*10)/nb_periods_per_frame;
+    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);
@@ -904,36 +907,33 @@ void nr_get_Msg3alloc(module_id_t module_id,
       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 AND assuming Msg2 was in the mixed slot
-      if ((k2 + DELTA[mu])%nb_slots_per_period == 0) {
-        temp_slot = current_slot + k2 + DELTA[mu]; // msg3 slot according to 8.3 in 38.213
-        ra->Msg3_slot = temp_slot%nr_slots_per_frame[mu];
-
-        if (is_xlsch_in_slot(RC.nrmac[module_id]->ulsch_slot_bitmap[ra->Msg3_slot / 64], ra->Msg3_slot) &&
-            nr_of_symbols<=scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols&&
-            start_symbol_index>=(14-scc->tdd_UL_DL_ConfigurationCommon->pattern1.nrofUplinkSymbols)) {
+      // 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;
-    temp_slot = current_slot + k2 + DELTA[mu]; // msg3 slot according to 8.3 in 38.213
-    ra->Msg3_slot = temp_slot%nr_slots_per_frame[mu];
+    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 > temp_slot)
+  if (n_slots_frame > abs_slot)
     ra->Msg3_frame = current_frame;
   else
-    ra->Msg3_frame = (current_frame + (temp_slot / n_slots_frame)) % 1024;
+    ra->Msg3_frame = (current_frame + (abs_slot / n_slots_frame)) % 1024;
 
   // beam association for FR2
   if (*scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0] >= 257) {
@@ -1041,10 +1041,10 @@ void fill_msg3_pusch_pdu(nfapi_nr_pusch_pdu_t *pusch_pdu,
   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);
@@ -1060,7 +1060,6 @@ void fill_msg3_pusch_pdu(nfapi_nr_pusch_pdu_t *pusch_pdu,
     pusch_pdu->mcs_index = mcsindex;
     pusch_pdu->pusch_data.tb_size = TBS;
     pusch_pdu->maintenance_parms_v3.ldpcBaseGraph = get_BG(TBS<<3,R);
-
   }
 }
 
@@ -1404,10 +1403,9 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
   NR_COMMON_channels_t *cc = &nr_mac->common_channels[CC_id];
   NR_UE_DL_BWP_t *dl_bwp = &ra->DL_BWP;
 
-  if (ra->Msg4_frame == frameP && ra->Msg4_slot == slotP ) {
-
-    uint8_t time_domain_assignment = 0;
-    uint8_t mcsIndex = 0;
+  // 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;
@@ -1427,7 +1425,8 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
       return;
     }
 
-    LOG_I(NR_MAC,"Generate msg4, rnti: %04x\n", ra->rnti);
+    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;
@@ -1442,26 +1441,6 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
       BWPSize = type0_PDCCH_CSS_config->num_rbs;
     }
 
-    /* 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);
-    }
-
     // get CCEindex, needed also for PUCCH and then later for PDCCH
     uint8_t aggregation_level;
     uint8_t nr_of_candidates;
@@ -1491,7 +1470,33 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
     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);
-    AssertFatal(alloc>=0,"Couldn't find a pucch allocation for ack nack (msg4)\n");
+    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;
@@ -1528,15 +1533,15 @@ void nr_generate_Msg4(module_id_t module_idP, int CC_id, frame_t frameP, sub_fra
       }
     }
 
+    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;
@@ -1832,8 +1837,6 @@ void nr_check_Msg4_Ack(module_id_t module_id, int CC_id, frame_t frame, sub_fram
       }
     } else {
       LOG_I(NR_MAC, "(UE %04x) Received Nack of RA-Msg4. Preparing retransmission!\n", ra->rnti);
-      ra->Msg4_frame = (frame + 1) % 1024;
-      ra->Msg4_slot = 1;
       ra->state = Msg4;
     }
   }

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -67,7 +67,7 @@ const int get_dl_tda(const gNB_MAC_INST *nrmac, const NR_ServingCellConfigCommon
     if ((slot%nr_slots_period) == tdd->nrofDownlinkSlots)
       return 2;
   }
-  return 0; // if FDD or not mixed slot in TDD, for now use default TDA (TODO handle CSI-RS slots)
+  return 0; // if FDD or not mixed slot in TDD, for now use default TDA
 }
 
 // Compute and write all MAC CEs and subheaders, and return number of written

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_ulsch.c

@@ -721,8 +721,6 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
           // the function is only called to decode the contention resolution sub-header
           if (nr_process_mac_pdu(gnb_mod_idP, UE, CC_idP, frameP, slotP, sduP, sdu_lenP, -1) == 0) {
             ra->state = Msg4;
-            ra->Msg4_frame = (frameP + 2) % 1024;
-            ra->Msg4_slot = 1;
             
             if (ra->msg3_dcch_dtch) {
               // Check if the UE identified by C-RNTI still exists at the gNB
@@ -743,8 +741,8 @@ void nr_rx_sdu(const module_id_t gnb_mod_idP,
                 reset_ul_harq_list(&UE_C->UE_sched_ctrl);
               }
             }
-            LOG_I(NR_MAC, "Scheduling RA-Msg4 for TC_RNTI 0x%04x (state %d, frame %d, slot %d)\n",
-                  (ra->msg3_dcch_dtch?ra->crnti:ra->rnti), ra->state, ra->Msg4_frame, ra->Msg4_slot);
+            LOG_I(NR_MAC, "Activating scheduling RA-Msg4 for TC_RNTI 0x%04x (state %d)\n",
+                  (ra->msg3_dcch_dtch?ra->crnti:ra->rnti), ra->state);
           }
           else {
              nr_mac_remove_ra_rnti(gnb_mod_idP, ra->rnti);

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -171,10 +171,6 @@ typedef struct {
   frame_t Msg3_frame;
   /// Msg3 time domain allocation index
   uint8_t Msg3_tda_id;
-  /// Subframe where Msg4 is to be sent
-  sub_frame_t Msg4_slot;
-  /// Frame where Msg4 is to be sent
-  frame_t Msg4_frame;
   /// harq_pid used for Msg4 transmission
   uint8_t harq_pid;
   /// UE RNTI allocated during RAR

openair2/RRC/NR/nr_rrc_config.c

@@ -604,23 +604,26 @@ void nr_rrc_config_ul_tda(NR_ServingCellConfigCommon_t *scc, int min_fb_delay){
         pusch_timedomainresourceallocation->mappingType = NR_PUSCH_TimeDomainResourceAllocation__mappingType_typeB;
         pusch_timedomainresourceallocation->startSymbolAndLength = get_SLIV(14-ul_symb,ul_symb-1); // starting in fist ul symbol til the last but one
         ASN_SEQUENCE_ADD(&scc->uplinkConfigCommon->initialUplinkBWP->pusch_ConfigCommon->choice.setup->pusch_TimeDomainAllocationList->list,pusch_timedomainresourceallocation);
-
+      }
       // UL TDA index 2 for msg3 in the mixed slot (TDD)
       int nb_periods_per_frame = get_nb_periods_per_frame(scc->tdd_UL_DL_ConfigurationCommon->pattern1.dl_UL_TransmissionPeriodicity);
       int nb_slots_per_period = ((1<<mu) * 10)/nb_periods_per_frame;
       struct NR_PUSCH_TimeDomainResourceAllocation *pusch_timedomainresourceallocation_msg3 = CALLOC(1,sizeof(struct NR_PUSCH_TimeDomainResourceAllocation));
       pusch_timedomainresourceallocation_msg3->k2  = CALLOC(1,sizeof(long));
-        *pusch_timedomainresourceallocation_msg3->k2 = nb_slots_per_period - DELTA[mu];
+      int no_mix_slot = ul_symb < 3 ? 1 : 0; // we need at least 2 symbols for scheduling Msg3
+      *pusch_timedomainresourceallocation_msg3->k2 = nb_slots_per_period - DELTA[mu] + no_mix_slot;
       if(*pusch_timedomainresourceallocation_msg3->k2 < min_fb_delay)
         *pusch_timedomainresourceallocation_msg3->k2 += nb_slots_per_period;
       AssertFatal(*pusch_timedomainresourceallocation_msg3->k2<33,"Computed k2 for msg3 %ld is larger than the range allowed by RRC (0..32)\n",
                   *pusch_timedomainresourceallocation_msg3->k2);
       pusch_timedomainresourceallocation_msg3->mappingType = NR_PUSCH_TimeDomainResourceAllocation__mappingType_typeB;
+      if(no_mix_slot)
+        pusch_timedomainresourceallocation_msg3->startSymbolAndLength = get_SLIV(0,13); // full allocation if there is no mixed slot
+      else
         pusch_timedomainresourceallocation_msg3->startSymbolAndLength = get_SLIV(14-ul_symb,ul_symb-1); // starting in fist ul symbol til the last but one
       ASN_SEQUENCE_ADD(&scc->uplinkConfigCommon->initialUplinkBWP->pusch_ConfigCommon->choice.setup->pusch_TimeDomainAllocationList->list,pusch_timedomainresourceallocation_msg3);
     }
   }
-  }
 }
 
 void set_dl_DataToUL_ACK(NR_PUCCH_Config_t *pucch_Config, int min_feedback_time) {