adding assertion for cset0 start prb

common/utils/nr/nr_common.c

@@ -757,7 +757,11 @@ void SLIV2SL(int SLIV,int *S,int *L) {
 
 nr_sco_info_t get_ssb_subcarrier_offset(int scs, uint32_t absoluteFrequencySSB, uint32_t absoluteFrequencyPointA)
 {
-  nr_sco_info_t sco;
+  nr_sco_info_t sco = {
+    .absolute_diff = absoluteFrequencySSB - absoluteFrequencyPointA,
+    .scaling = 1,
+    .subcarrier_offset = 0
+  };
   // for FR1 k_SSB expressed in terms of 15kHz SCS
   // for FR2 k_SSB expressed in terms of the subcarrier spacing provided by the higher-layer parameter subCarrierSpacingCommon
   sco.absolute_diff = (absoluteFrequencySSB - absoluteFrequencyPointA);

openair2/LAYER2/NR_MAC_COMMON/nr_mac.h

@@ -480,7 +480,7 @@ typedef struct Type0_PDCCH_CSS_config_s {
   uint32_t search_space_frame_period;  // in slots
   uint32_t ssb_length;
   uint32_t ssb_index;
-  uint32_t cset_start_rb;
+  int32_t cset_start_rb;
   NR_SubcarrierSpacing_t scs_pdcch;
   bool active;
 } NR_Type0_PDCCH_CSS_config_t;

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -4442,6 +4442,8 @@ void get_type0_PDCCH_CSS_config_parameters(NR_Type0_PDCCH_CSS_config_t *type0_PD
 
   type0_PDCCH_CSS_config->n_0 = ((uint32_t)(big_o*(1<<scs_pdcch)) + (uint32_t)(type0_PDCCH_CSS_config->ssb_index*big_m))%num_slot_per_frame;
   type0_PDCCH_CSS_config->cset_start_rb = ssb_offset_point_a - type0_PDCCH_CSS_config->rb_offset;
+  AssertFatal(type0_PDCCH_CSS_config->cset_start_rb >= 0, "Invalid CSET0 start PRB %d SSB offset point A %d RB offset %d\n",
+              type0_PDCCH_CSS_config->cset_start_rb, ssb_offset_point_a, type0_PDCCH_CSS_config->rb_offset);
 }
 
 void fill_coresetZero(NR_ControlResourceSet_t *coreset0, NR_Type0_PDCCH_CSS_config_t *type0_PDCCH_CSS_config)