Add option to rr.conf to select sub-band CQI K value (#3071)

srsenb/hdr/stack/rrc/rrc_config_common.h

@@ -31,6 +31,8 @@ struct rrc_cfg_cqi_t {
   uint32_t           nof_prb;
   uint32_t           period;
   uint32_t           m_ri;
+  bool               is_subband_enabled;
+  uint32_t           subband_k;
   bool               simultaneousAckCQI;
   rrc_cfg_cqi_mode_t mode;
 };

srsenb/rr.conf.example

@@ -47,6 +47,7 @@ phy_cnfg =
     //subframe = [0, 10, 20, 30];  // Optional vector of subframe indices every period where CQI resources will be allocated (default uses all)
     nof_prb = 1;
     m_ri = 8; // RI period in CQI period
+    //subband_k = 1; // If enabled and > 0, configures sub-band CQI reporting and defines K (see 36.213 7.2.2). If disabled, configures wideband CQI
   };
 };
 

srsenb/src/enb_cfg_parser.cc

@@ -736,6 +736,8 @@ int parse_rr(all_args_t* args_, rrc_cfg_t* rrc_cfg_)
   cqi_report_cnfg.add_field(new parser::field<uint32>("period", &rrc_cfg_->cqi_cfg.period));
   cqi_report_cnfg.add_field(new parser::field<uint32>("m_ri", &rrc_cfg_->cqi_cfg.m_ri));
   cqi_report_cnfg.add_field(new parser::field<uint32>("nof_prb", &rrc_cfg_->cqi_cfg.nof_prb));
+  cqi_report_cnfg.add_field(
+      new parser::field<uint32>("subband_k", &rrc_cfg_->cqi_cfg.subband_k, &rrc_cfg_->cqi_cfg.is_subband_enabled));
   cqi_report_cnfg.add_field(new parser::field<bool>("simultaneousAckCQI", &rrc_cfg_->cqi_cfg.simultaneousAckCQI));
   cqi_report_cnfg.add_field(new field_sf_mapping(rrc_cfg_->cqi_cfg.sf_mapping, &rrc_cfg_->cqi_cfg.nof_subframes, 1));
 

srsenb/src/stack/rrc/ue_rr_cfg.cc

@@ -120,8 +120,14 @@ void fill_cqi_report_enb_cfg(cqi_report_cfg_s& cqi_report_cfg, const rrc_cfg_t&
   } else {
     cqi_report_cfg.cqi_report_periodic_present = true;
     auto& cqi_setup                            = cqi_report_cfg.cqi_report_periodic.set_setup();
-    cqi_setup.cqi_format_ind_periodic.set(
-        cqi_report_periodic_c::setup_s_::cqi_format_ind_periodic_c_::types::wideband_cqi);
+    if (enb_cfg.cqi_cfg.subband_k == 0) {
+      cqi_setup.cqi_format_ind_periodic.set(
+          cqi_report_periodic_c::setup_s_::cqi_format_ind_periodic_c_::types::wideband_cqi);
+    } else {
+      cqi_setup.cqi_format_ind_periodic.set(
+          cqi_report_periodic_c::setup_s_::cqi_format_ind_periodic_c_::types::subband_cqi);
+      cqi_setup.cqi_format_ind_periodic.subband_cqi().k = enb_cfg.cqi_cfg.subband_k;
+    }
     cqi_setup.simul_ack_nack_and_cqi = enb_cfg.cqi_cfg.simultaneousAckCQI;
   }
   cqi_report_cfg.nom_pdsch_rs_epre_offset = 0;