Add SSB to configuration factory

lib/include/srsran/common/phy_cfg_nr.h

@@ -148,6 +148,13 @@ struct phy_cfg_nr_t {
   bool get_pusch_uci_cfg(const srsran_slot_cfg_t&   slot_cfg,
                          const srsran_uci_cfg_nr_t& uci_cfg,
                          srsran_sch_cfg_nr_t&       pusch_cfg) const;
+
+  /**
+   * @brief Generate SSB configuration from the overall configuration
+   * @attention Sampling rate is the only parameter missing
+   * @return valid SSB configuration
+   */
+  srsran_ssb_cfg_t get_ssb_cfg() const;
 };
 
 } // namespace srsran

lib/src/common/phy_cfg_nr.cc

@@ -11,6 +11,7 @@
  */
 
 #include "srsran/common/phy_cfg_nr.h"
+#include "srsran/common/band_helper.h"
 #include "srsran/srsran.h"
 
 namespace srsran {
@@ -337,4 +338,30 @@ bool phy_cfg_nr_t::get_pusch_uci_cfg(const srsran_slot_cfg_t&   slot_cfg,
   return true;
 }
 
+srsran_ssb_cfg_t phy_cfg_nr_t::get_ssb_cfg() const
+{
+  // Retrieve band
+  srsran::srsran_band_helper bh   = srsran::srsran_band_helper();
+  uint16_t                   band = bh.get_band_from_dl_freq_Hz(carrier.dl_center_frequency_hz);
+  srsran_assert(band != UINT16_MAX,
+                "DL frequency %f MHz does not belong to any valid band",
+                carrier.dl_center_frequency_hz / 1e6);
+
+  // Make SSB configuration
+  srsran_ssb_cfg_t ssb_cfg = {};
+  ssb_cfg.center_freq_hz   = carrier.dl_center_frequency_hz;
+  ssb_cfg.ssb_freq_hz      = carrier.ssb_center_freq_hz;
+  ssb_cfg.scs              = ssb.scs;
+  ssb_cfg.pattern          = bh.get_ssb_pattern(band, ssb.scs);
+  ssb_cfg.duplex_mode      = duplex.mode;
+  ssb_cfg.periodicity_ms   = ssb.periodicity_ms;
+
+  srsran_assert(ssb_cfg.pattern != SRSRAN_SSB_PATTERN_INVALID,
+                "Invalid SSB pattern for band %d and SSB subcarrier spacing %s",
+                band,
+                srsran_subcarrier_spacing_to_str(ssb.scs));
+
+  return ssb_cfg;
+}
+
 } // namespace srsran

lib/src/common/phy_cfg_nr_default.cc

@@ -417,6 +417,17 @@ phy_cfg_nr_default_t::phy_cfg_nr_default_t(const reference_cfg_t& reference_cfg)
       srsran_assertion_failure("Invalid TDD reference");
   }
 
+  if (duplex.mode == SRSRAN_DUPLEX_MODE_TDD) {
+    carrier.dl_center_frequency_hz = 3513.6e6;
+    ssb.scs                        = srsran_subcarrier_spacing_30kHz;
+  } else {
+    carrier.dl_center_frequency_hz = 881.5e6;
+    ssb.scs                        = srsran_subcarrier_spacing_15kHz;
+  }
+  carrier.ssb_center_freq_hz = carrier.dl_center_frequency_hz;
+  ssb.position_in_burst[0]   = true;
+  ssb.periodicity_ms         = 5;
+
   switch (reference_cfg.pdcch) {
     case reference_cfg_t::R_PDCCH_CUSTOM_COMMON_SS:
       make_pdcch_custom_common_ss(pdcch, carrier);