Merge branch 'integration_2020_wk42_2' into 'develop'

Integration 2020 wk42 (2)

MR921 : Hotfix for DL DCI issue in UE  
Fixing a bug from last MR.  
Fix in nr_dlsim that prevents reporting false 'PDSCH ok' message

MR915 : Fix to avoid RRC->X2AP ticking every msec when x2ap task is not enabled  
The aim of itti RRC_SUBFRAME_PROCESS message (MAC->RRC) is to trigger an itti X2AP_SUBFRAME_PROCESS message (RRC->X2AP)  
This change avoids creating RRC_SUBFRAME_PROCESS message if x2ap task is not enabled

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -140,6 +140,12 @@ int generate_dlsch_header(unsigned char *mac_header,
                           unsigned char short_padding,
                           unsigned short post_padding){return 0;}
 
+// Dummy function to avoid linking error at compilation of nr-dlsim
+int is_x2ap_enabled(void)
+{
+  return 0;
+}
+
 // needed for some functions
 openair0_config_t openair0_cfg[MAX_CARDS];
 

openair1/SIMULATION/NR_PHY/prachsim.c

@@ -100,6 +100,12 @@ rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(
 
 int8_t nr_mac_rrc_data_ind_ue(const module_id_t module_id, const int CC_id, const uint8_t gNB_index, const int8_t channel, const uint8_t* pduP, const sdu_size_t pdu_len) {return 0;}
 
+// Dummy function to avoid linking error at compilation of nr-prachsim
+int is_x2ap_enabled(void)
+{
+  return 0;
+}
+
 int main(int argc, char **argv){
 
   char c;

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -119,6 +119,12 @@ rrc_gNB_process_GTPV1U_CREATE_TUNNEL_RESP(
   return 0;
 }
 
+// Dummy function to avoid linking error at compilation of nr-ulsim
+int is_x2ap_enabled(void)
+{
+  return 0;
+}
+
 // needed for some functions
 uint16_t n_rnti = 0x1234;
 openair0_config_t openair0_cfg[MAX_CARDS];

openair2/RRC/NR/rrc_gNB.c

@@ -82,6 +82,7 @@
 
 #include "executables/softmodem-common.h"
 #include <openair2/RRC/NR/rrc_gNB_UE_context.h>
+#include "x2ap_eNB.h"
 
 //#define XER_PRINT
 
@@ -317,8 +318,10 @@ void nr_rrc_subframe_process(protocol_ctxt_t *const ctxt_pP, const int CC_id) {
   MessageDef *msg;
 
   /* send a tick to x2ap */
+  if (is_x2ap_enabled()){
     msg = itti_alloc_new_message(TASK_RRC_ENB, X2AP_SUBFRAME_PROCESS);
     itti_send_msg_to_task(TASK_X2AP, ctxt_pP->module_id, msg);
+  }
 }
 
 ///---------------------------------------------------------------------------------------------------------------///