gnb: make nof HARQ retxs configurable in the appconfig

Author: frankist

apps/gnb/gnb_appconfig.h

@@ -151,6 +151,8 @@ struct pdsch_appconfig {
   unsigned fixed_sib1_mcs = 5;
   /// Number of UE DL HARQ processes.
   unsigned nof_harqs = 16;
+  /// Maximum number of times an HARQ process can be retransmitted, before it gets discarded.
+  unsigned max_nof_harq_retxs = 4;
   /// Maximum number of consecutive DL KOs before an RLF is reported.
   unsigned max_consecutive_kos = 100;
   /// Redundancy version sequence to use. Each element can have one of the following values: {0, 1, 2, 3}.

apps/gnb/gnb_appconfig_cli11_schema.cpp

@@ -544,6 +544,11 @@ static void configure_cli11_pdsch_args(CLI::App& app, pdsch_appconfig& pdsch_par
   app.add_option("--nof_harqs", pdsch_params.nof_harqs, "Number of DL HARQ processes")
       ->capture_default_str()
       ->check(CLI::IsMember({2, 4, 6, 8, 10, 12, 16}));
+  app.add_option("--max_nof_harq_retxs",
+                 pdsch_params.max_nof_harq_retxs,
+                 "Maximum number of times a DL HARQ can be retransmitted, before it gets discarded")
+      ->capture_default_str()
+      ->check(CLI::Range(0, 4));
   app.add_option("--max_consecutive_kos",
                  pdsch_params.max_consecutive_kos,
                  "Maximum number of HARQ-ACK consecutive KOs before an Radio Link Failure is reported")

apps/gnb/gnb_appconfig_translators.cpp

@@ -1482,6 +1482,7 @@ scheduler_expert_config srsran::generate_scheduler_expert_config(const gnb_appco
   out_cfg.ue.pdsch_rv_sequence.assign(pdsch.rv_sequence.begin(), pdsch.rv_sequence.end());
   out_cfg.ue.dl_harq_la_cqi_drop_threshold     = pdsch.harq_la_cqi_drop_threshold;
   out_cfg.ue.dl_harq_la_ri_drop_threshold      = pdsch.harq_la_ri_drop_threshold;
+  out_cfg.ue.max_nof_harq_retxs                = pdsch.max_nof_harq_retxs;
   out_cfg.ue.max_pdschs_per_slot               = pdsch.max_pdschs_per_slot;
   out_cfg.ue.max_pdcch_alloc_attempts_per_slot = pdsch.max_pdcch_alloc_attempts_per_slot;
   out_cfg.ue.pdsch_nof_rbs                     = {pdsch.min_rb_size, pdsch.max_rb_size};