Merge remote-tracking branch 'origin/dci_alt_size_fix' into integration_2025_w46 (!3729)

DCI 00 alt size fix

DCI size for format 00 and 10 should be equal so we need to compute the size of
the alternative format when computing the size of DCIX0. There was a bug where
the alt_size input (0 in that case) was taken into account also when computing
that alternative size, resulting in an alt_size of 0. Possibly easier to
understand by looking at the code then reading this description.

openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c

@@ -2819,11 +2819,13 @@ uint16_t nr_dci_size(const NR_UE_DL_BWP_t *DL_BWP,
       dci_pdu->harq_pid.nbits = 4;
       dci_pdu->frequency_domain_assignment.nbits = (uint8_t)ceil(log2((N_RB * (N_RB + 1)) >>1)); // Freq domain assignment -- hopping scenario to be updated
       size += dci_pdu->frequency_domain_assignment.nbits;
-      if(alt_size >= size)
-        size += alt_size - size; // Padding to match 1_0 size
-      else if (ss_type == NR_SearchSpace__searchSpaceType_PR_common) {
-        dci_pdu->frequency_domain_assignment.nbits -= (size - alt_size);
-        size = alt_size;
+      if (alt_size) {
+        if(alt_size >= size)
+          size += alt_size - size; // Padding to match 1_0 size
+        else if (ss_type == NR_SearchSpace__searchSpaceType_PR_common) {
+          dci_pdu->frequency_domain_assignment.nbits -= (size - alt_size);
+          size = alt_size;
+        }
       }
       // UL/SUL indicator assumed to be 0
       break;
@@ -3133,7 +3135,7 @@ uint16_t nr_dci_size(const NR_UE_DL_BWP_t *DL_BWP,
     default:
       AssertFatal(1==0, "Invalid NR DCI format %d\n", format);
   }
-  LOG_D(NR_MAC, "DCI size: %d\n", size);
+  LOG_D(NR_MAC, "DCI format %d size: %d alt_size %d\n", format, size, alt_size);
   return size;
 }