Merge remote-tracking branch 'origin/NTN_FR2_bands' into integration_2026_w11 (!3414)

Added NTN-FR2 FDD bands defined in release 18 in Ka-band range

* NTN-FR2 bands 510, 511, 512 added. TS 38.101-5 v 18.9 defines these 3 FR2-FDD
  bands for NTN operation.
* These bands are defined in Ka band range (17.3Ghz - 31Ghz).
* Tested using the added conf files using RFSIM and GEO configuration.
* There were some inconsistencies observed when testing with RFSimulator before UE
  Syncs to the gNB in terms of samples being written for FR2 configurations. Once
  the UE syncs, the inconsistencies disappear.
* this is the problem - UE writes incorrect number of samples and gNB complains
  about getting samples in past
* The above inconsistencies were also fixed in this merge request.
* These commits solving above inconsistencies were removed from this MR and a
  different MR was raised. MR with those commits: !3928.

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -1184,6 +1184,7 @@ typedef struct {
 } nr_prach_info_3gpp_fr2_t;
 
 // Table 6.3.3.2-4: Random access configurations for FR2 and unpaired spectrum
+// and NTN-FR2 and paired as defined in 38.211v18.06
 static const nr_prach_info_3gpp_fr2_t table_6_3_3_2_4_prachConfig_Index[256] = {
     // format,      format,       x,          y,           y,              SFN_nbr,       star_symb,   slots_sfn,  occ_slot,
     // duration
@@ -1458,7 +1459,8 @@ int get_format0(uint8_t index, uint8_t unpaired, frequency_range_t frequency_ran
     if (frequency_range==FR1)
       format = table_6_3_3_2_2_prachConfig_Index[index].format;
     else
-      AssertFatal(0==1,"no paired spectrum for FR2\n");
+      // Table defined for NTN-FR2 and paired in 3GPP Spec 38.211v18.06
+      format = table_6_3_3_2_4_prachConfig_Index[index].format;
   }
   return format;
 }