mac: change array beam_allocation to int16_t

int16_t is sufficient to hold beam_id and -1 if not allocated. Following
commits will bring changes to only pass LSB 15 bits as beam_id to PHY.

openair2/GNB_APP/gnb_config.c

@@ -1630,7 +1630,7 @@ void RCconfig_nr_macrlc(configmodule_interface_t *cfg)
           AssertFatal(NFAPI_MODE == NFAPI_MONOLITHIC, "Analog beamforming only supported for monolithic scenario\n");
         NR_beam_info_t *beam_info = &RC.nrmac[j]->beam_info;
         int beams_per_period = *MacRLC_ParamList.paramarray[j][MACRLC_ANALOG_BEAMS_PERIOD_IDX].u8ptr;
-        beam_info->beam_allocation = malloc16(beams_per_period * sizeof(int *));
+        beam_info->beam_allocation = malloc16(beams_per_period * sizeof(beam_info->beam_allocation));
         beam_info->beam_duration = *MacRLC_ParamList.paramarray[j][MACRLC_ANALOG_BEAM_DURATION_IDX].u8ptr;
         beam_info->beams_per_period = beams_per_period;
         beam_info->beam_allocation_size = -1; // to be initialized once we have information on frame configuration

openair2/LAYER2/NR_MAC_gNB/config.c

@@ -780,7 +780,7 @@ static void initialize_beam_information(NR_beam_info_t *beam_info, int mu, int s
               slots_per_frame);
   beam_info->beam_allocation_size = size / beam_info->beam_duration;
   for (int i = 0; i < beam_info->beams_per_period; i++) {
-    beam_info->beam_allocation[i] = malloc16(beam_info->beam_allocation_size * sizeof(int));
+    beam_info->beam_allocation[i] = malloc16(beam_info->beam_allocation_size * sizeof(*beam_info->beam_allocation));
     for (int j = 0; j < beam_info->beam_allocation_size; j++)
       beam_info->beam_allocation[i][j] = -1;
   }

openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c

@@ -3666,7 +3666,7 @@ static inline int get_beam_index(const NR_beam_info_t *beam_info, int frame, int
   return ((frame * slots_per_frame + slot) / beam_info->beam_duration) % beam_info->beam_allocation_size;
 }
 
-NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame, int slot, int beam_index, int slots_per_frame)
+NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame, int slot, int16_t beam_index, int slots_per_frame)
 {
   // if no beam allocation for analog beamforming we always return beam index 0 (no multiple beams)
   if (beam_info->beam_mode == NO_BEAM_MODE)
@@ -3675,7 +3675,7 @@ NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame,
   const int index = get_beam_index(beam_info, frame, slot, slots_per_frame);
   for (int i = 0; i < beam_info->beams_per_period; i++) {
     NR_beam_alloc_t beam_struct = {.new_beam = false, .idx = i};
-    int *beam = &beam_info->beam_allocation[i][index];
+    int16_t *beam = &beam_info->beam_allocation[i][index];
     if (*beam == -1) {
       beam_struct.new_beam = true;
       *beam = beam_index;
@@ -3689,7 +3689,7 @@ NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame,
   return (NR_beam_alloc_t) {.new_beam = false, .idx = -1};
 }
 
-void reset_beam_status(NR_beam_info_t *beam_info, int frame, int slot, int beam_index, int slots_per_frame, bool new_beam)
+void reset_beam_status(NR_beam_info_t *beam_info, int frame, int slot, int16_t beam_index, int slots_per_frame, bool new_beam)
 {
   if(!new_beam) // need to reset only if the beam was allocated specifically for this instance
     return;

openair2/LAYER2/NR_MAC_gNB/mac_proto.h

@@ -447,8 +447,8 @@ int ul_buffer_index(int frame, int slot, int slots_per_frame, int size);
 void UL_tti_req_ahead_initialization(gNB_MAC_INST *gNB, int n, int CCid, frame_t frameP, int slotP);
 void fapi_beam_index_allocation(NR_ServingCellConfigCommon_t *scc, const nr_mac_config_t *config, gNB_MAC_INST *mac);
 int get_fapi_beamforming_index(gNB_MAC_INST *mac, int ssb_idx);
-NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame, int slot, int beam_index, int slots_per_frame);
-void reset_beam_status(NR_beam_info_t *beam_info, int frame, int slot, int beam_index, int slots_per_frame, bool new_beam);
+NR_beam_alloc_t beam_allocation_procedure(NR_beam_info_t *beam_info, int frame, int slot, int16_t beam_index, int slots_per_frame);
+void reset_beam_status(NR_beam_info_t *beam_info, int frame, int slot, int16_t beam_index, int slots_per_frame, bool new_beam);
 void beam_selection_procedures(gNB_MAC_INST *mac, NR_UE_info_t *UE);
 void nr_sr_reporting(gNB_MAC_INST *nrmac, frame_t frameP, slot_t slotP);
 bwp_info_t get_pdsch_bwp_start_size(gNB_MAC_INST *nr_mac, NR_UE_info_t *UE);

openair2/LAYER2/NR_MAC_gNB/nr_mac_gNB.h

@@ -826,7 +826,7 @@ typedef enum {
 
 typedef struct {
   /// list of allocated beams per period
-  int **beam_allocation;
+  int16_t **beam_allocation;
   int beam_duration; // in slots
   int beams_per_period;
   int beam_allocation_size;