SRSUE: add PRACH config present field in PHY configuration structure

lib/include/srslte/interfaces/rrc_interface_types.h

@@ -177,6 +177,8 @@ struct phy_cfg_t {
   {
     ul_cfg    = {};
     dl_cfg    = {};
+
+    prach_cfg_present = false;
     prach_cfg = {};
 
     // CommonConfig defaults for non-zero values
@@ -221,6 +223,8 @@ struct phy_cfg_t {
 
   srslte_dl_cfg_t    dl_cfg    = {};
   srslte_ul_cfg_t    ul_cfg    = {};
+
+  bool               prach_cfg_present = false;
   srslte_prach_cfg_t prach_cfg = {};
 };
 

lib/src/asn1/rrc_asn1_utils.cc

@@ -607,6 +607,7 @@ void set_phy_cfg_t_common_prach(phy_cfg_t* cfg, const asn1::rrc::prach_cfg_info_
     cfg->prach_cfg.hs_flag        = asn1_type->high_speed_flag;
   }
   cfg->prach_cfg.root_seq_idx = root_seq_idx;
+  cfg->prach_cfg_present      = true;
 }
 
 void set_phy_cfg_t_common_pdsch(phy_cfg_t* cfg, const asn1::rrc::pdsch_cfg_common_s& asn1_type)

srsue/src/phy/phy.cc

@@ -466,7 +466,11 @@ bool phy::set_config(srslte::phy_cfg_t config_, uint32_t cc_idx)
 
   Info("Setting configuration\n");
 
-  bool reconfigure_prach = !cc_idx && (prach_cfg != config_.prach_cfg);
+  // The PRACH shall be re-configured only if:
+  // - The new configuration belongs to the primary cell
+  // - The PRACH configuration is present
+  // - The PRACH configuration has changed
+  bool reconfigure_prach = !cc_idx && config_.prach_cfg_present && (prach_cfg != config_.prach_cfg);
 
   if (reconfigure_prach) {
     prach_buffer.reset_cfg();