adding assertion for cset0 start prb

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

@@ -4443,6 +4443,8 @@ 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)