diff --git a/openair1/PHY/NR_TRANSPORT/nr_dci_tools_common.c b/openair1/PHY/NR_TRANSPORT/nr_dci_tools_common.c
new file mode 100644
index 0000000000..d26a52f157
--- /dev/null
+++ b/openair1/PHY/NR_TRANSPORT/nr_dci_tools_common.c
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The OpenAirInterface Software Alliance licenses this file to You under
+ * the OAI Public License, Version 1.1  (the "License"); you may not use this file
+ * except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.openairinterface.org/?page_id=698
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *-------------------------------------------------------------------------------
+ * For more information about the OpenAirInterface (OAI) Software Alliance:
+ *      contact@openairinterface.org
+ */
+
+/*! \file PHY/NR_TRANSPORT/nr_dci_tools_common.c
+ * \brief
+ * \author
+ * \date 2018
+ * \version 0.1
+ * \company Eurecom
+ * \email:
+ * \note
+ * \warning
+ */
+
+#include "nr_dci.h"
+
+//#define DEBUG_FILL_DCI
+
+#include "nr_dlsch.h"
+
+
+void get_coreset_rballoc(uint8_t *FreqDomainResource,int *n_rb,int *rb_offset) {
+
+  uint8_t count=0, start=0, start_set=0;
+
+  uint64_t bitmap = (((uint64_t)FreqDomainResource[0])<<37)|
+    (((uint64_t)FreqDomainResource[1])<<29)|
+    (((uint64_t)FreqDomainResource[2])<<21)|
+    (((uint64_t)FreqDomainResource[3])<<13)|
+    (((uint64_t)FreqDomainResource[4])<<5)|
+    (((uint64_t)FreqDomainResource[5])>>3);
+  
+  for (int i=0; i<45; i++)
+    if ((bitmap>>(44-i))&1) {
+      count++;
+      if (!start_set) {
+        start = i;
+        start_set = 1;
+      }
+    }
+  *rb_offset = 6*start;
+  *n_rb = 6*count;
+}
+