Merge remote-tracking branch 'origin/hack-bch-no-sched-sf-0' into develop

openair2/LAYER2/MAC/eNB_scheduler.c

@@ -586,6 +586,23 @@ eNB_dlsch_ulsch_scheduler(module_id_t module_idP,
     memset(cc[CC_id].vrb_map_UL, 0, 100);
     cc[CC_id].mcch_active = 0;
     clear_nfapi_information(RC.mac[module_idP], CC_id, frameP, subframeP);
+
+    /* hack: skip BCH RBs in subframe 0 for DL scheduling,
+     *       because with high MCS we may exceed code rate 0.93
+     *       when using those RBs (36.213 7.1.7 says the UE may
+     *       skip decoding if the code rate is higher than 0.93)
+     * TODO: remove this hack, deal with physical bits properly
+     *       i.e. reduce MCS in the scheduler if code rate > 0.93
+     */
+    if (subframeP == 0) {
+      int i;
+      int bw = cc[CC_id].mib->message.dl_Bandwidth;
+      /* start and count defined for RBs: 6, 15, 25, 50, 75, 100 */
+      int start[6] = { 0, 4, 9, 22, 34, 47 };
+      int count[6] = { 6, 7, 7,  6,  7,  6 };
+      for (i = 0; i < count[bw]; i++)
+        cc[CC_id].vrb_map[start[bw] + i] = 1;
+    }
   }
 
   /* Refresh UE list based on UEs dropped by PHY in previous subframe */