FeMBMS PBCH Initial Scan Procedures

openair1/PHY/LTE_TRANSPORT/phich_common.c

@@ -35,6 +35,10 @@
 
 uint8_t get_mi(LTE_DL_FRAME_PARMS *frame_parms,uint8_t subframe)
 {
+  // for FeMBMS
+  if(frame_parms->FeMBMS_active!=0){
+	return(0);
+  }
 
   // for FDD
   if (frame_parms->frame_type == FDD)

openair1/PHY/LTE_UE_TRANSPORT/initial_sync.c

@@ -126,26 +126,54 @@ int pbch_detection(PHY_VARS_UE *ue, runmode_t mode)
   pbch_decoded = 0;
 
   for (frame_mod4=0; frame_mod4<4; frame_mod4++) {
-    pbch_tx_ant = rx_pbch(&ue->common_vars,
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+    if (ue->FeMBMS_active != 2){	
+#endif
+    	pbch_tx_ant = rx_pbch(&ue->common_vars,
                           ue->pbch_vars[0],
                           frame_parms,
                           0,
                           SISO,
                           ue->high_speed_flag,
                           frame_mod4);
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+	}else{
+    	pbch_tx_ant = rx_pbch_fembms(&ue->common_vars,
+                          ue->pbch_vars[0],
+                          frame_parms,
+                          0,
+                          SISO,
+                          ue->high_speed_flag,
+                          frame_mod4);
+	}
+#endif
 
-    if ((pbch_tx_ant>0) && (pbch_tx_ant<=2)) {
+    	if ((pbch_tx_ant>0) && (pbch_tx_ant<=2)) {
-      pbch_decoded = 1;
+      		pbch_decoded = 1;
-      break;
+      	break;
     }
 
-    pbch_tx_ant = rx_pbch(&ue->common_vars,
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+    if (ue->FeMBMS_active != 2){
+#endif
+    	pbch_tx_ant = rx_pbch(&ue->common_vars,
                           ue->pbch_vars[0],
                           frame_parms,
                           0,
                           ALAMOUTI,
                           ue->high_speed_flag,
                           frame_mod4);
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+    }else{
+	    pbch_tx_ant = rx_pbch_fembms(&ue->common_vars,
+                          ue->pbch_vars[0],
+                          frame_parms,
+                          0,
+                          ALAMOUTI,
+                          ue->high_speed_flag,
+                          frame_mod4);
+    }
+#endif
 
     if ((pbch_tx_ant>0) && (pbch_tx_ant<=2)) {
       pbch_decoded = 1;
@@ -202,7 +230,9 @@ int pbch_detection(PHY_VARS_UE *ue, runmode_t mode)
       break;
     }
 
-
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+  if(ue->FeMBMS_active != 2) {
+#endif
     // now check for PHICH parameters
     frame_parms->phich_config_common.phich_duration = (PHICH_DURATION_t)((ue->pbch_vars[0]->decoded_output[2]>>4)&1);
     dummy = (ue->pbch_vars[0]->decoded_output[2]>>2)&3;
@@ -251,6 +281,28 @@ int pbch_detection(PHY_VARS_UE *ue, runmode_t mode)
           frame_parms->phich_config_common.phich_duration,
           phich_resource);  //frame_parms->phich_config_common.phich_resource);
 #endif
+
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+ }else{
+	for(int i=0; i<RX_NB_TH;i++)
+        { 
+          ue->proc.proc_rxtx[i].frame_rx =   (((ue->pbch_vars[0]->decoded_output[2]&31)<<1) + (ue->pbch_vars[0]->decoded_output[1]>>7))<<4;
+          ue->proc.proc_rxtx[i].frame_tx = ue->proc.proc_rxtx[0].frame_rx;
+	}
+	#ifdef DEBUG_INITIAL_SYNCH
+	LOG_I("[UE%d] Initial sync: FeMBMS pbch decoded sucessfully p %d, tx_ant %d, frame %d, N_RB_DL %d, AdditionalNonMBSFN_SF %d, frame_mod4 %d\n",
+            ue->Mod_id,
+            frame_parms->nb_antenna_ports_eNB,
+            pbch_tx_ant,
+            ue->proc.proc_rxtx[0].frame_rx,
+            frame_parms->N_RB_DL,
+                0,
+                frame_mod4
+        );
+	#endif
+	
+ }
+#endif
     return(0);
   } else {
     return(-1);
@@ -330,6 +382,21 @@ int initial_sync(PHY_VARS_UE *ue, runmode_t mode)
 #ifdef DEBUG_INITIAL_SYNCH
     LOG_I(PHY,"FDD Normal prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
           frame_parms->Nid_cell,metric_fdd_ncp,phase_fdd_ncp,flip_fdd_ncp,ret);
+#endif
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+      if (ret==-1){
+	 ue->FeMBMS_active = 2;
+	 ret = pbch_detection(ue,mode);
+	 if (ret==-1){
+		ue->FeMBMS_active = 0;
+		frame_parms->FeMBMS_active = 0;
+	 }
+	 else frame_parms->FeMBMS_active = 1;
+#ifdef DEBUG_INITIAL_SYNCH
+      LOG_I(PHY,"FeMBMS Normal prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
+          frame_parms->Nid_cell,metric_fdd_ncp,phase_fdd_ncp,flip_fdd_ncp,ret);
+#endif
+      }
 #endif
   } else {
 #ifdef DEBUG_INITIAL_SYNCH
@@ -377,6 +444,25 @@ int initial_sync(PHY_VARS_UE *ue, runmode_t mode)
       LOG_I(PHY,"FDD Extended prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
             frame_parms->Nid_cell,metric_fdd_ecp,phase_fdd_ecp,flip_fdd_ecp,ret);
 #endif
+	
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+      if (ret==-1){
+	 ue->FeMBMS_active = 2;
+	 ret = pbch_detection(ue,mode);
+	 if (ret==-1){
+		ue->FeMBMS_active = 0;
+		frame_parms->FeMBMS_active = 0;
+	 }
+	 else frame_parms->FeMBMS_active = 1;
+#ifdef DEBUG_INITIAL_SYNCH
+      LOG_I(PHY,"FeMBMS CAS Extended prefix: CellId %d metric %d, phase %d, flip %d, pbch %d\n",
+            frame_parms->Nid_cell,metric_fdd_ecp,phase_fdd_ecp,flip_fdd_ecp,ret);
+#endif
+
+      }
+#endif
+
+
     } else {
 #ifdef DEBUG_INITIAL_SYNCH
       LOG_I(PHY,"FDD Extended prefix: SSS error condition: sync_pos %d, sync_pos_slot %d\n", sync_pos, sync_pos_slot);

openair1/PHY/LTE_UE_TRANSPORT/pbch_ue.c

@@ -647,7 +647,7 @@ void pbch_unscrambling_fembms(LTE_DL_FRAME_PARMS *frame_parms,
   // x1 is set in first call to lte_gold_generic
   x2 = frame_parms->Nid_cell+(1<<9); //this is c_init for FeMBMS in 36.211 Sec 6.6.1
 
-  printf("pbch_unscrambling: Nid_cell = %d, x2 = %d, frame_mod4 %d length %d\n",frame_parms->Nid_cell,x2,frame_mod4,length);
+  //msg("pbch_unscrambling: Nid_cell = %d, x2 = %d, frame_mod4 %d length %d\n",frame_parms->Nid_cell,x2,frame_mod4,length);
   for (i=0; i<length; i++) {
     if (i%32==0) {
       s = lte_gold_generic(&x1, &x2, reset);

openair1/PHY/defs_UE.h

@@ -621,6 +621,11 @@ typedef struct {
   //uint8_t local_flag;
   /// \brief Indicator of current run mode of UE (normal_txrx, rx_calib_ue, no_L2_connect, debug_prach)
   runmode_t mode;
+
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+  /// \brief Indicator that UE is configured for FeMBMS functionality (This flag should be avoided) ... just kept for PBCH initical scan (TODO)
+  int FeMBMS_active;
+#endif
   /// \brief Indicator that UE should perform band scanning
   int UE_scan;
   /// \brief Indicator that UE should perform coarse scanning around carrier

openair1/PHY/defs_common.h

@@ -632,6 +632,9 @@ typedef struct {
   uint8_t threequarter_fs;
   /// Size of FFT
   uint16_t ofdm_symbol_size;
+#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
+  uint8_t FeMBMS_active;
+#endif
 #if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
   /// Size of FFT
   uint16_t ofdm_symbol_size_khz_1dot25;