Add a new configuration option that controls PDSCH baseband sample dump to a file on KO.

lib/include/srsran/interfaces/ue_nr_interfaces.h

@@ -175,6 +175,7 @@ struct phy_args_nr_t {
   srsran_ue_ul_nr_args_t ul               = {};
   std::set<uint32_t>     fixed_sr         = {1};
   uint32_t               fix_wideband_cqi = 15; // Set to a non-zero value for fixing the wide-band CQI report
+  bool                   store_pdsch_ko   = false;
 
   phy_args_nr_t()
   {

lib/include/srsran/interfaces/ue_phy_interfaces.h

@@ -86,6 +86,8 @@ struct phy_args_t {
   float       force_ul_amplitude           = 0.0f;
   bool        detect_cp                    = false;
 
+  bool nr_store_pdsch_ko = false;
+
   float    in_sync_rsrp_dbm_th    = -130.0f;
   float    in_sync_snr_db_th      = 1.0f;
   uint32_t nof_in_sync_events     = 10;
@@ -129,8 +131,8 @@ public:
   } prach_info_t;
 
   virtual void
-                       prach_send(uint32_t preamble_idx, int allowed_subframe, float target_power_dbm, float ta_base_sec = 0.0f) = 0;
-  virtual prach_info_t prach_get_info() = 0;
+  prach_send(uint32_t preamble_idx, int allowed_subframe, float target_power_dbm, float ta_base_sec = 0.0f) = 0;
+  virtual prach_info_t prach_get_info()                                                                     = 0;
 
   /* Indicates the transmission of a SR signal in the next opportunity */
   virtual void sr_send()        = 0;

srsue/src/main.cc

@@ -405,6 +405,11 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
      bpo::value<int>(&args->phy.force_N_id_2)->default_value(-1),
      "Force using a specific PSS (set to -1 to allow all PSSs).")
 
+    // PHY NR args
+    ("phy.nr.store_pdsch_ko",
+      bpo::value<bool>(&args->phy.nr_store_pdsch_ko)->default_value(false),
+      "Dumps the PDSCH baseband samples into a file on KO reception.")
+
     // 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/nr/cc_worker.cc

@@ -13,6 +13,7 @@
 #include "srsue/hdr/phy/nr/cc_worker.h"
 #include "srsran/common/band_helper.h"
 #include "srsran/common/buffer_pool.h"
+#include "srsran/common/string_helpers.h"
 #include "srsran/srsran.h"
 
 namespace srsue {
@@ -300,6 +301,32 @@ bool cc_worker::decode_pdsch_dl()
     }
   }
 
+  if (not pdsch_res.tb[0].crc and phy.args.store_pdsch_ko) {
+    static unsigned unique_filename_id = 0;
+    unsigned        id                 = ++unique_filename_id;
+
+    fmt::memory_buffer filename;
+    fmt::format_to(filename, "pdsch_ko_bb_samples_{}.bin", id);
+
+    srsran_filesink_t filesink = {};
+    if (srsran_filesink_init(&filesink, (char*)srsran::to_c_str(filename), SRSRAN_COMPLEX_FLOAT_BIN) == 0) {
+      srsran_filesink_write(&filesink, (void*)rx_buffer[0], ue_dl.fft[0].sf_sz);
+      srsran_filesink_free(&filesink);
+
+      str_extra_t str_extra;
+      srsran_sch_cfg_nr_info(&pdsch_cfg, str_extra.data(), (uint32_t)str_extra.size());
+      logger.info("PDSCH: KO detected, dumping PDSCH baseband samples into file '%s'"
+                  "\n"
+                  "Information: cc_idx=%d pid=%d slot_idx=%d sf_len=%d\n%s",
+                  srsran::to_c_str(filename),
+                  cc_idx,
+                  pid,
+                  dl_slot_cfg.idx,
+                  ue_dl.fft[0].sf_sz,
+                  str_extra.data());
+    }
+  }
+
   // Enqueue PDSCH ACK information only if the RNTI is type C
   if (pdsch_cfg.grant.rnti_type == srsran_rnti_type_c) {
     phy.set_pending_ack(dl_slot_cfg.idx, ack_resource, pdsch_res.tb[0].crc);

srsue/src/ue.cc

@@ -97,6 +97,7 @@ int ue::init(const all_args_t& args_)
     phy_args_nr.nof_phy_threads      = args.phy.nof_phy_threads;
     phy_args_nr.worker_cpu_mask      = args.phy.worker_cpu_mask;
     phy_args_nr.log                  = args.phy.log;
+    phy_args_nr.store_pdsch_ko       = args.phy.nr_store_pdsch_ko;
     if (lte_phy->init(phy_args_nr, lte_stack.get(), lte_radio.get())) {
       srsran::console("Error initializing NR PHY.\n");
       ret = SRSRAN_ERROR;

srsue/ue.conf.example

@@ -374,6 +374,15 @@ enable = false
 #nof_in_sync_events     = 10
 #nof_out_of_sync_events = 20
 
+#####################################################################
+# PHY NR specific configuration options
+#
+# store_pdsch_ko:       Dumps the PDSCH baseband samples into a file on KO reception
+#
+#####################################################################
+[phy.nr]
+#store_pdsch_ko = false
+
 #####################################################################
 # Simulation configuration options
 #