srsUE: Add option to filter N_id_2 / PSS to configuration

lib/include/srsran/interfaces/ue_phy_interfaces.h

@@ -39,6 +39,8 @@ struct phy_args_t {
   std::vector<uint32_t> dl_nr_arfcn_list = {
       632628}; // vectorized version of dl_nr_arfcn that gets populated during init
 
+  int force_N_id_2 = -1; // Cell identity within the identity group (PSS) to filter.
+
   float dl_freq = -1.0f;
   float ul_freq = -1.0f;
 

srsue/hdr/phy/search.h

@@ -36,7 +36,7 @@ public:
 
   explicit search(srslog::basic_logger& logger) : logger(logger) {}
   ~search();
-  void     init(srsran::rf_buffer_t& buffer_, uint32_t nof_rx_channels, search_callback* parent);
+  void     init(srsran::rf_buffer_t& buffer_, uint32_t nof_rx_channels, search_callback* parent, int force_N_id_2_);
   void     reset();
   float    get_last_cfo();
   void     set_agc_enable(bool enable);

srsue/src/main.cc

@@ -396,6 +396,10 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
      bpo::value<bool>(&use_standard_lte_rates)->default_value(false),
      "Whether to use default LTE sample rates instead of shorter variants.")
 
+    ("phy.force_N_id_2",
+     bpo::value<int>(&args->phy.force_N_id_2)->default_value(-1),
+     "Force using a specific PSS (set to -1 to allow all PSSs).")
+
     // UE simulation args
     ("sim.airplane_t_on_ms",
      bpo::value<int>(&args->stack.nas.sim.airplane_t_on_ms)->default_value(-1),

srsue/src/phy/search.cc

@@ -46,7 +46,7 @@ search::~search()
   srsran_ue_cellsearch_free(&cs);
 }
 
-void search::init(srsran::rf_buffer_t& buffer_, uint32_t nof_rx_channels, search_callback* parent)
+void search::init(srsran::rf_buffer_t& buffer_, uint32_t nof_rx_channels, search_callback* parent, int force_N_id_2_)
 {
   p = parent;
 
@@ -64,7 +64,7 @@ void search::init(srsran::rf_buffer_t& buffer_, uint32_t nof_rx_channels, search
   // Set options defined in expert section
   p->set_ue_sync_opts(&cs.ue_sync, 0);
 
-  force_N_id_2 = -1;
+  force_N_id_2 = force_N_id_2_;
 }
 
 void search::reset()

srsue/src/phy/sync.cc

@@ -81,7 +81,7 @@ void sync::init(srsran::radio_interface_phy* _radio,
   }
 
   // Initialize cell searcher
-  search_p.init(sf_buffer, nof_rf_channels, this);
+  search_p.init(sf_buffer, nof_rf_channels, this, worker_com->args->force_N_id_2);
 
   // Initialize SFN synchronizer, it uses only pcell buffer
   sfn_p.init(&ue_sync, worker_com->args, sf_buffer, sf_buffer.size());