Rewrite PUCCH allocation (simplified, restricted)

- No dynamic allocation of PUCCH structures
- Use first PUCCH for HARQ (can only allocate for up to two slots in
  single PUCCH, simplistic nr_acknack_scheduling!)
- Use second PUCCH for CSI, do not multiplex!

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

@@ -443,15 +443,10 @@ void nr_simple_dlsch_preprocessor(module_id_t module_id,
   UE_info->num_pdcch_cand[UE_id][cid]++;
 
   /* Find PUCCH occasion */
-  nr_acknack_scheduling(module_id,
-                        UE_id,
-                        frame,
-                        slot,
-                        num_slots_per_tdd,
-                        &sched_ctrl->pucch_sched_idx,
-                        &sched_ctrl->pucch_occ_idx);
-
-  AssertFatal(sched_ctrl->pucch_sched_idx >= 0, "no uplink slot for PUCCH found!\n");
+  const bool alloc = nr_acknack_scheduling(module_id, UE_id, frame, slot);
+  AssertFatal(alloc,
+              "could not find uplink slot for PUCCH (RNTI %04x@%d.%d)!\n",
+              rnti, frame, slot);
 
   uint16_t *vrb_map = RC.nrmac[module_id]->common_channels[CC_id].vrb_map;
   // for now HARQ PID is fixed and should be the same as in post-processor
@@ -596,7 +591,7 @@ void nr_schedule_ue_spec(module_id_t module_id,
 
     const int current_harq_pid = slot % num_slots_per_tdd;
     NR_UE_harq_t *harq = &sched_ctrl->harq_processes[current_harq_pid];
-    NR_sched_pucch_t *pucch = &sched_ctrl->sched_pucch[sched_ctrl->pucch_sched_idx][sched_ctrl->pucch_occ_idx];
+    NR_sched_pucch_t *pucch = &sched_ctrl->sched_pucch[0];
     harq->feedback_slot = pucch->ul_slot;
     harq->is_waiting = 1;
     UE_info->mac_stats[UE_id].dlsch_rounds[harq->round]++;

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_phytest.c

@@ -328,14 +328,10 @@ void nr_preprocessor_phytest(module_id_t module_id,
               __func__,
               UE_id);
 
-  nr_acknack_scheduling(module_id,
-                        UE_id,
-                        frame,
-                        slot,
-                        num_slots_per_tdd,
-                        &sched_ctrl->pucch_sched_idx,
-                        &sched_ctrl->pucch_occ_idx);
-  AssertFatal(sched_ctrl->pucch_sched_idx >= 0, "no uplink slot for PUCCH found!\n");
+  const bool alloc = nr_acknack_scheduling(module_id, UE_id, frame, slot);
+  AssertFatal(alloc,
+              "could not find uplink slot for PUCCH (RNTI %04x@%d.%d)!\n",
+              rnti, frame, slot);
 
   sched_ctrl->rbStart = rbStart;
   sched_ctrl->rbSize = rbSize;

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -1864,16 +1864,6 @@ int add_new_nr_ue(module_id_t mod_idP, rnti_t rntiP){
     UE_info->UE_sched_ctrl[UE_id].ul_rssi = 0;
     /* set illegal time domain allocation to force recomputation of all fields */
     UE_info->UE_sched_ctrl[UE_id].pusch_save.time_domain_allocation = -1;
-    UE_info->UE_sched_ctrl[UE_id].sched_pucch = (NR_sched_pucch_t **)malloc(num_slots_ul*sizeof(NR_sched_pucch_t *));
-    for (int s=0; s<num_slots_ul;s++)
-      UE_info->UE_sched_ctrl[UE_id].sched_pucch[s] = (NR_sched_pucch_t *)malloc(2*sizeof(NR_sched_pucch_t));
-
-    for (int k=0; k<num_slots_ul; k++) {
-      for (int l=0; l<2; l++)
-        memset((void *) &UE_info->UE_sched_ctrl[UE_id].sched_pucch[k][l],
-               0,
-               sizeof(NR_sched_pucch_t));
-    }
     LOG_I(MAC, "gNB %d] Add NR UE_id %d : rnti %x\n",
           mod_idP,
           UE_id,
@@ -1913,7 +1903,6 @@ void mac_remove_nr_ue(module_id_t mod_id, rnti_t rnti)
     UE_info->active[UE_id] = FALSE;
     UE_info->rnti[UE_id] = 0;
     remove_nr_ue_list(&UE_info->list, UE_id);
-    free(UE_info->UE_sched_ctrl[UE_id].sched_pucch);
     memset((void *) &UE_info->UE_sched_ctrl[UE_id],
            0,
            sizeof(NR_UE_sched_ctrl_t));

openair2/LAYER2/NR_MAC_gNB/mac_proto.h

@@ -215,15 +215,10 @@ void nr_csi_meas_reporting(int Mod_idP,
                            int ul_slots,
                            int n_slots_frame);
 
-void nr_acknack_scheduling(int Mod_idP,
+bool nr_acknack_scheduling(int Mod_idP,
                            int UE_id,
                            frame_t frameP,
-                           sub_frame_t slotP,
-                           int slots_per_tdd,
-                           int *pucch_id,
-                           int *pucch_occ);
-
-int get_pucch_resource(NR_UE_info_t *UE_info,int UE_id,int k,int l);
+                           sub_frame_t slotP);
 
 void get_pdsch_to_harq_feedback(int Mod_idP,
                                 int UE_id,

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -385,10 +385,12 @@ typedef struct {
   /// the currently active BWP in UL
   NR_BWP_Uplink_t *active_ubwp;
 
-  NR_sched_pucch_t **sched_pucch;
-  /// selected PUCCH index, if scheduled
-  int pucch_sched_idx;
-  int pucch_occ_idx;
+  /// PUCCH scheduling information. Array of two, we assume for the moment:
+  /// HARQ (and SR) in the first field, CSI in second (as fixed by RRC conf.,
+  /// i.e. if actually present).  The order is important for
+  /// nr_acknack_scheduling()!
+  NR_sched_pucch_t sched_pucch[2];
+
   NR_sched_pusch_save_t pusch_save;
   NR_sched_pusch_t sched_pusch;