NR UE: introduce support to define multiple cells

This feature shall allow in future to simulate an arbitratry number of UEs connected to an other arbitrary number of cells.
Therefore each RF-frontend (also called RU) needs to be configured for one specific cell.
In case of handover of a UE from one cell to another cell, it needs to switch RUs accordingly (TODO).

There has to be a 1-to-1 mapping between RUs and cells.
Each UE will be assigned to one of the defined cells.
Initially all UEs are assigned to cell 0.

openair1/PHY/INIT/nr_parms.c

@@ -525,9 +525,16 @@ int nr_init_frame_parms_ue(NR_DL_FRAME_PARMS *fp,
   return 0;
 }
 
-void nr_init_frame_parms_ue_sa(NR_DL_FRAME_PARMS *frame_parms, uint64_t downlink_frequency, int32_t delta_duplex, uint8_t mu, int N_RB_DL, int ssb_start_subcarrier, uint16_t nr_band)
+void nr_init_frame_parms_ue_sa(NR_DL_FRAME_PARMS *frame_parms, const nrUE_cell_params_t *cell)
 {
-  LOG_I(PHY,"SA init parameters. DL freq %lu UL offset %d SSB numerology %d N_RB_DL %d\n",
+  const uint64_t downlink_frequency = cell->rf_frequency;
+  const int64_t delta_duplex = cell->rf_freq_offset;
+  const uint8_t mu = cell->numerology;
+  const int N_RB_DL = cell->N_RB_DL;
+  const int ssb_start_subcarrier = cell->ssb_start;
+  const uint16_t nr_band = cell->band;
+
+  LOG_I(PHY,"SA init parameters. DL freq %lu UL offset %ld SSB numerology %d N_RB_DL %d\n",
         downlink_frequency,
         delta_duplex,
         mu,

openair1/PHY/INIT/nr_phy_init.h

@@ -28,7 +28,7 @@
 int nr_get_ssb_start_symbol(const NR_DL_FRAME_PARMS *fp, uint8_t i_ssb);
 void nr_init_frame_parms(nfapi_nr_config_request_scf_t *config, NR_DL_FRAME_PARMS *frame_parms);
 int nr_init_frame_parms_ue(NR_DL_FRAME_PARMS *frame_parms, fapi_nr_config_request_t *config, uint16_t nr_band);
-void nr_init_frame_parms_ue_sa(NR_DL_FRAME_PARMS *frame_parms, uint64_t downlink_frequency, int32_t delta_duplex, uint8_t mu, int N_RB_DL, int ssb_start_subcarrier, uint16_t nr_band);
+void nr_init_frame_parms_ue_sa(NR_DL_FRAME_PARMS *frame_parms, const nrUE_cell_params_t *cell);
 int nr_init_frame_parms_ue_sl(NR_DL_FRAME_PARMS *fp,
                               sl_nr_phy_config_request_t *config,
                               int threequarter_fs,

openair1/PHY/defs_nr_UE.h

@@ -356,8 +356,20 @@ typedef struct {
   double tune_offset;
   uint64_t if_frequency;
   int if_freq_offset;
+  int used_by_cell;
 } nrUE_RU_params_t;
 
+typedef struct {
+  int ru_id;
+  int band;
+  uint64_t rf_frequency;
+  int64_t rf_freq_offset;
+  int numerology;
+  int N_RB_DL;
+  int ssb_start;
+  int used_by_ue;
+} nrUE_cell_params_t;
+
 /// Top-level PHY Data Structure for UE
 typedef struct PHY_VARS_NR_UE_s {
   /// \brief Module ID indicator for this instance