WIP: adding srs channel estimation to eNB. estimation results yet to be checked.

openair1/PHY/LTE_ESTIMATION/lte_ul_channel_estimation.c

@@ -667,28 +667,28 @@ int32_t lte_ul_channel_estimation(PHY_VARS_eNB *eNB,
 }
 
 extern uint16_t transmission_offset_tdd[16];
-#define DEBUG_SRS
+//#define DEBUG_SRS
 
 int32_t lte_srs_channel_estimation(LTE_DL_FRAME_PARMS *frame_parms,
                                    LTE_eNB_COMMON *common_vars,
                                    LTE_eNB_SRS *srs_vars,
                                    SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
-                                   unsigned char sub_frame_number,
+                                   unsigned char subframe,
                                    unsigned char eNB_id)
 {
 
-  int T_SFC,aa;
+  int aa;
   int N_symb,symbol;
-  uint8_t nb_antennas_rx = frame_parms->nb_antenna_ports_eNB;
+  uint8_t nb_antennas_rx = frame_parms->nb_antennas_rx;
 #ifdef DEBUG_SRS
   char fname[40], vname[40];
 #endif
 
-  uint8_t Ssrs  = frame_parms->soundingrs_ul_config_common.srs_SubframeConfig;
+  //uint8_t Ssrs  = frame_parms->soundingrs_ul_config_common.srs_SubframeConfig;
+  //uint8_t T_SFC = (Ssrs<=7 ? 5 : 10);
 
   N_symb = 2*7-frame_parms->Ncp;
-  symbol = (sub_frame_number+1)*N_symb-1; //SRS is always in last symbol of subframe
+  symbol = N_symb-1; //SRS is always in last symbol of subframe
-  T_SFC = (Ssrs<=7 ? 5 : 10);
 
   /*
      msg("SRS channel estimation eNB %d, subframs %d, %d %d %d %d %d\n",eNB_id,sub_frame_number,
@@ -699,19 +699,21 @@ int32_t lte_srs_channel_estimation(LTE_DL_FRAME_PARMS *frame_parms,
      SRS_parms->Ssrs);
   */
 
-  if ((1<<(sub_frame_number%T_SFC))&transmission_offset_tdd[Ssrs]) {
+  //if ((1<<(sub_frame_number%T_SFC))&transmission_offset_tdd[Ssrs]) {
 
-    if (generate_srs_rx(frame_parms,
+  if (generate_srs(frame_parms,
-                        soundingrs_ul_config_dedicated,
+		   soundingrs_ul_config_dedicated,
-                        srs_vars->srs)==-1) {
+		   &srs_vars->srs[eNB_id],
-      msg("lte_srs_channel_estimation: Error in generate_srs_rx\n");
+		   0x7FFF,
+		   subframe)==-1) {
+      LOG_E(PHY,"lte_srs_channel_estimation: Error in generate_srs_rx\n");
       return(-1);
     }
 
     for (aa=0; aa<nb_antennas_rx; aa++) {
 #ifdef DEBUG_SRS
       msg("SRS channel estimation eNB %d, subframs %d, aarx %d, %p, %p, %p\n",eNB_id,sub_frame_number,aa,
-          &common_vars->rxdataF[eNB_id][aa][2*frame_parms->ofdm_symbol_size*symbol],
+          &common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],
           srs_vars->srs,
           srs_vars->srs_ch_estimates[eNB_id][aa]);
 #endif
@@ -719,14 +721,15 @@ int32_t lte_srs_channel_estimation(LTE_DL_FRAME_PARMS *frame_parms,
       //write_output("eNB_rxF.m","rxF",&common_vars->rxdataF[0][aa][2*frame_parms->ofdm_symbol_size*symbol],2*(frame_parms->ofdm_symbol_size),2,1);
       //write_output("eNB_srs.m","srs_eNB",common_vars->srs,(frame_parms->ofdm_symbol_size),1,1);
 
-      mult_cpx_conj_vector((int16_t*) &common_vars->rxdataF[eNB_id][aa][2*frame_parms->ofdm_symbol_size*symbol],
+      //memcpy(srs_vars->srs_ch_estimates[eNB_id][aa],&srs_vars->srs[eNB_id],frame_parms->ofdm_symbol_size*sizeof(int32_t));
-			   (int16_t*) srs_vars->srs,
+      //memcpy(srs_vars->srs_ch_estimates[eNB_id][aa],&common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],frame_parms->ofdm_symbol_size*sizeof(int32_t));
+      mult_cpx_conj_vector((int16_t*) &common_vars->rxdataF[eNB_id][aa][frame_parms->ofdm_symbol_size*symbol],
+			   (int16_t*) &srs_vars->srs[eNB_id],
 			   (int16_t*) srs_vars->srs_ch_estimates[eNB_id][aa],
 			   frame_parms->ofdm_symbol_size,
 			   15,
 			   0);
 
-      //msg("SRS channel estimation cmult out\n");
 #ifdef USER_MODE
 #ifdef DEBUG_SRS
       sprintf(fname,"eNB_id%d_an%d_srs_ch_est.m",eNB_id,aa);
@@ -735,7 +738,6 @@ int32_t lte_srs_channel_estimation(LTE_DL_FRAME_PARMS *frame_parms,
 #endif
 #endif
     }
-  }
 
   /*
     else {

openair1/PHY/LTE_TRANSPORT/proto.h

@@ -1538,9 +1538,11 @@ uint8_t SE2I_TBS(float SE,
     @param soundingrs_ul_config_dedicated Dynamic configuration from RRC during Connection Establishment
     @param txdataF pointer to the frequency domain TX signal
     @returns 0 on success*/
-int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
+int generate_srs(LTE_DL_FRAME_PARMS *frame_parms,
-                    SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
+		 SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
-                    int *txdataF);
+		 int *txdataF,
+		 int16_t amp,
+		 uint32_t subframe);
 
 int32_t generate_srs_tx_emul(PHY_VARS_UE *phy_vars_ue,
                              uint8_t subframe);

openair1/PHY/LTE_TRANSPORT/srs_modulation.c

@@ -120,17 +120,15 @@ int compareints (const void * a, const void * b)
   return ( *(unsigned short*)a - *(unsigned short*)b );
 }
 
-
+#define DEBUG_SRS
-int32_t generate_srs_tx(PHY_VARS_UE *ue,
+int32_t generate_srs(LTE_DL_FRAME_PARMS *frame_parms,
-                        uint8_t eNB_id,
+		     SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
-                        int16_t amp,
+		     int32_t *txptr,
-                        uint32_t subframe)
+		     int16_t amp,
+		     uint32_t subframe)
 {
 
-  LTE_DL_FRAME_PARMS *frame_parms=&ue->frame_parms;
+  uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos;
-  SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated=&ue->soundingrs_ul_config_dedicated[eNB_id];
-  int32_t **txdataF = ue->common_vars.txdataF;
-  uint16_t msrsb=0,Nb=0,nb,b,msrs0=0,k,Msc_RS,Msc_RS_idx,carrier_pos,symbol_offset;
   uint16_t *Msc_idx_ptr;
   int32_t k0;
   //uint32_t subframe_offset;
@@ -178,7 +176,7 @@ int32_t generate_srs_tx(PHY_VARS_UE *ue,
   }
 
   if (k0<0) {
-    msg("generate_srs: invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
+    LOG_E(PHY,"generate_srs: invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
     return(-1);
   }
 
@@ -188,7 +186,7 @@ int32_t generate_srs_tx(PHY_VARS_UE *ue,
   if (Msc_idx_ptr)
     Msc_RS_idx = Msc_idx_ptr - dftsizes;
   else {
-    msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
+    LOG_E(PHY,"generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
     return(-1);
   }
 
@@ -199,29 +197,20 @@ int32_t generate_srs_tx(PHY_VARS_UE *ue,
   else if (Msc_RS==144)
     Msc_RS_idx = 9;
   else {
-    msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
+    LOG_E(PHY,"generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
     return(-1);
   }
 
 #endif
 
 #ifdef DEBUG_SRS
-  msg("generate_srs_tx: Msc_RS = %d, Msc_RS_idx = %d\n",Msc_RS, Msc_RS_idx);
+  LOG_I(PHY,"generate_srs_tx: Msc_RS = %d, Msc_RS_idx = %d, k0 = %d\n",Msc_RS, Msc_RS_idx,k0);
 #endif
 
     carrier_pos = (frame_parms->first_carrier_offset + k0);
     if (carrier_pos>frame_parms->ofdm_symbol_size) {
         carrier_pos -= frame_parms->ofdm_symbol_size;
     }
-    uint16_t nsymb = (frame_parms->Ncp==0) ? 14:12;
-    symbol_offset = (int)frame_parms->ofdm_symbol_size*((subframe*nsymb)+(nsymb-1));
-
-    //msg("carrier_pos = %d\n",carrier_pos);
-    //subframe_offset = subframe*frame_parms->symbols_per_tti*frame_parms->ofdm_symbol_size;
-    //symbol_offset = subframe_offset+(frame_parms->symbols_per_tti-1)*frame_parms->ofdm_symbol_size;
-
-    int32_t *txptr;
-    txptr = &txdataF[0][symbol_offset];
 
     for (k=0; k<Msc_RS; k++) {
       int32_t real = ((int32_t) amp * (int32_t) ul_ref_sigs[u][v][Msc_RS_idx][k<<1])     >> 15;
@@ -245,6 +234,7 @@ int generate_srs_tx_emul(PHY_VARS_UE *phy_vars_ue,uint8_t subframe)
   return(0);
 }
 
+#if 0
 int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
                     SOUNDINGRS_UL_CONFIG_DEDICATED *soundingrs_ul_config_dedicated,
                     int *txdataF)
@@ -285,7 +275,7 @@ int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
   }
 
   if (k0<0) {
-    msg("Invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
+    LOG_E(PHY,"Invalid parameter set msrs0=%d, msrsb=%d, Nb=%d => nb=%d, k0=%d\n",msrs0,msrsb,Nb,nb,k0);
     return(-1);
   }
 
@@ -295,7 +285,7 @@ int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
   if (Msc_idx_ptr)
     Msc_RS_idx = Msc_idx_ptr - dftsizes;
   else {
-    msg("generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
+    LOG_E(PHY,"generate_srs: index for Msc_RS=%d not found\n",Msc_RS);
     return(-1);
   }
 
@@ -306,23 +296,21 @@ int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
   else if (Msc_RS==144)
     Msc_RS_idx = 9;
   else {
-    msg("generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
+    LOG_E(PHY,"generate_srs: index for Msc_RS=%d not implemented\n",Msc_RS);
     return(-1);
   }
 
 #endif
 
 #ifdef DEBUG_SRS
-  msg("generate_srs_rx: Msc_RS = %d, Msc_RS_idx = %d, k0=%d\n",Msc_RS, Msc_RS_idx,k0);
+  LOG_I(PHY,"generate_srs_rx: Msc_RS = %d, Msc_RS_idx = %d, k0=%d\n",Msc_RS, Msc_RS_idx,k0);
 #endif
 
   carrier_pos = (frame_parms->first_carrier_offset + k0) % frame_parms->ofdm_symbol_size;
 
   for (k=0; k<Msc_RS; k++) {
-    ((short*) txdataF)[carrier_pos<<2]   = ul_ref_sigs_rx[0][0][Msc_RS_idx][k<<2];
+    ((short*) txdataF)[carrier_pos<<1]   = ul_ref_sigs_rx[0][0][Msc_RS_idx][k<<1];
-    ((short*) txdataF)[(carrier_pos<<2)+1] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+1];
+    ((short*) txdataF)[(carrier_pos<<1)+1] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<1)+1];
-    ((short*) txdataF)[(carrier_pos<<2)+2] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+2];
-    ((short*) txdataF)[(carrier_pos<<2)+3] = ul_ref_sigs_rx[0][0][Msc_RS_idx][(k<<2)+3];
     carrier_pos+=2;
 
     if (carrier_pos >= frame_parms->ofdm_symbol_size)
@@ -365,7 +353,7 @@ int generate_srs_rx(LTE_DL_FRAME_PARMS *frame_parms,
   //  write_output("srs_rx.m","srsrx",txdataF,1024,2,1);
   return(0);
 }
-
+#endif
 
 #ifdef MAIN
 main()

openair1/PHY/TOOLS/lte_phy_scope.c

@@ -84,7 +84,7 @@ FD_lte_phy_scope_enb *create_lte_phy_scope_enb( void )
   fl_set_xyplot_ybounds(fdui->rxsig_t,10,70);
 
   // Time-domain channel response
-  fdui->chest_t = fl_add_xyplot( FL_NORMAL_XYPLOT, 410, 20, 370, 100, "Channel Impulse Response (samples, abs)" );
+  fdui->chest_t = fl_add_xyplot( FL_NORMAL_XYPLOT, 410, 20, 370, 100, "SRS Frequency Response (samples, abs)" );
   fl_set_object_boxtype( fdui->chest_t, FL_EMBOSSED_BOX );
   fl_set_object_color( fdui->chest_t, FL_BLACK, FL_RED );
   fl_set_object_lcolor( fdui->chest_t, FL_WHITE ); // Label color
@@ -196,7 +196,8 @@ void phy_scope_eNB(FD_lte_phy_scope_enb *form,
   bit = malloc(coded_bits_per_codeword*sizeof(float));
 
   rxsig_t = (int16_t**) phy_vars_enb->common_vars.rxdata[eNB_id];
-  chest_t = (int16_t**) phy_vars_enb->pusch_vars[UE_id]->drs_ch_estimates_time[eNB_id];
+  //chest_t = (int16_t**) phy_vars_enb->pusch_vars[UE_id]->drs_ch_estimates_time[eNB_id];
+  chest_t = (int16_t**) phy_vars_enb->srs_vars[UE_id].srs_ch_estimates[eNB_id];
   chest_f = (int16_t**) phy_vars_enb->pusch_vars[UE_id]->drs_ch_estimates[eNB_id];
   pusch_llr = (int16_t*) phy_vars_enb->pusch_vars[UE_id]->llr;
   pusch_comp = (int16_t*) phy_vars_enb->pusch_vars[UE_id]->rxdataF_comp[eNB_id][0];
@@ -232,8 +233,10 @@ void phy_scope_eNB(FD_lte_phy_scope_enb *form,
 
     if (chest_t[0] !=NULL) {
       for (i=0; i<(frame_parms->ofdm_symbol_size); i++) {
-        i2 = (i+(frame_parms->ofdm_symbol_size>>1))%frame_parms->ofdm_symbol_size;
+        //i2 = (i+(frame_parms->ofdm_symbol_size>>1))%frame_parms->ofdm_symbol_size;
-        time2[i] = (float)(i-(frame_parms->ofdm_symbol_size>>1));
+	i2=i;
+        //time2[i] = (float)(i-(frame_parms->ofdm_symbol_size>>1));
+        time2[i] = (float)i;
         chest_t_abs[0][i] = 10*log10((float) (1+chest_t[0][2*i2]*chest_t[0][2*i2]+chest_t[0][2*i2+1]*chest_t[0][2*i2+1]));
 
         if (chest_t_abs[0][i] > ymax)

openair1/SCHED/phy_procedures_lte_eNb.c

@@ -2087,7 +2087,7 @@ void prach_procedures(PHY_VARS_eNB *eNB) {
   VCD_SIGNAL_DUMPER_DUMP_FUNCTION_BY_NAME(VCD_SIGNAL_DUMPER_FUNCTIONS_PHY_ENB_PRACH_RX,0);
 }
 
-void pucch_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,int UE_id,int harq_pid)
+void pucch_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,int UE_id,int harq_pid,uint8_t do_srs)
 {
   LTE_DL_FRAME_PARMS *fp=&eNB->frame_parms;
   uint8_t SR_payload = 0,*pucch_payload=NULL,pucch_payload0[2]= {0,0},pucch_payload1[2]= {0,0};
@@ -2099,10 +2099,6 @@ void pucch_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,int UE_id,int harq
   PUCCH_FMT_t format;
   const int subframe = proc->subframe_rx;
   const int frame = proc->frame_rx;
-  uint16_t srsPeriodicity;
-  uint16_t srsOffset;
-  uint16_t do_srs=0;
-  uint16_t is_srs_pos=0;
 
   if ((eNB->dlsch[UE_id][0]) &&
       (eNB->dlsch[UE_id][0]->rnti>0) &&
@@ -2112,16 +2108,6 @@ void pucch_procedures(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,int UE_id,int harq
     do_SR = is_SR_subframe(eNB,proc,UE_id);
     //      do_SR = 0;
 
-    // check if there is SRS and we have to use shortened format
-    // TODO: check for exceptions in transmission of SRS together with ACK/NACK
-    is_srs_pos = is_srs_occasion_common(fp,pdcch_alloc2ul_frame(fp,frame,subframe),pdcch_alloc2ul_subframe(fp,subframe));
-    if (is_srs_pos && eNB->soundingrs_ul_config_dedicated[UE_id].srsConfigDedicatedSetup ) {
-      compute_srs_pos(fp->frame_type, eNB->soundingrs_ul_config_dedicated[UE_id].srs_ConfigIndex, &srsPeriodicity, &srsOffset);
-      if ((((10*pdcch_alloc2ul_frame(fp,frame,subframe)+pdcch_alloc2ul_subframe(fp,subframe)) % srsPeriodicity) == srsOffset)) {
-	do_srs = 1;
-      }
-    }
-
     // Now ACK/NAK
     // First check subframe_tx flag for earlier subframes
 
@@ -2896,6 +2882,11 @@ void phy_procedures_eNB_uespec_RX(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,const
   const int frame    = proc->frame_rx;
   int offset         = eNB->CC_id;//(proc == &eNB->proc.proc_rxtx[0]) ? 0 : 1;
 
+  uint16_t srsPeriodicity;
+  uint16_t srsOffset;
+  uint16_t do_srs=0;
+  uint16_t is_srs_pos=0;
+
   T(T_ENB_PHY_UL_TICK, T_INT(eNB->Mod_id), T_INT(frame), T_INT(subframe));
 
   T(T_ENB_PHY_INPUT_SIGNAL, T_INT(eNB->Mod_id), T_INT(frame), T_INT(subframe), T_INT(0),
@@ -2925,13 +2916,34 @@ void phy_procedures_eNB_uespec_RX(PHY_VARS_eNB *eNB,eNB_rxtx_proc_t *proc,const
     eNB->cba_last_reception[i]=0;
   }
 
-  // Do PUCCH processing first
-
   for (i=0; i<NUMBER_OF_UE_MAX; i++) {
-    pucch_procedures(eNB,proc,i,harq_pid);
-  }
 
-  for (i=0; i<NUMBER_OF_UE_MAX; i++) {
+    // Do SRS processing 
+    // check if there is SRS and we have to use shortened format
+    // TODO: check for exceptions in transmission of SRS together with ACK/NACK
+    is_srs_pos = is_srs_occasion_common(fp,pdcch_alloc2ul_frame(fp,frame,subframe),pdcch_alloc2ul_subframe(fp,subframe));
+    if (is_srs_pos && eNB->soundingrs_ul_config_dedicated[i].srsConfigDedicatedSetup ) {
+      compute_srs_pos(fp->frame_type, eNB->soundingrs_ul_config_dedicated[i].srs_ConfigIndex, &srsPeriodicity, &srsOffset);
+      if ((((10*pdcch_alloc2ul_frame(fp,frame,subframe)+pdcch_alloc2ul_subframe(fp,subframe)) % srsPeriodicity) == srsOffset)) {
+	do_srs = 1;
+      }
+    }
+
+    if (do_srs==1) {
+      if (lte_srs_channel_estimation(fp,
+				     &eNB->common_vars,
+				     &eNB->srs_vars[i],
+				     &eNB->soundingrs_ul_config_dedicated[i],
+				     subframe,
+				     0/*eNB_id*/)) {
+	LOG_E(PHY,"problem processing SRS\n");
+      }
+    }
+
+    // Do PUCCH processing 
+
+    pucch_procedures(eNB,proc,i,harq_pid, do_srs);
+
 
     // check for Msg3
     if (eNB->mac_enabled==1) {

openair1/SCHED/phy_procedures_lte_ue.c

@@ -1579,7 +1579,13 @@ void ue_srs_procedures(PHY_VARS_UE *ue,UE_rxtx_proc_t *proc,uint8_t eNB_id,uint8
             nb_rb_srs,
             tx_amp);
 
-    generate_srs_tx(ue, eNB_id, tx_amp, subframe_tx);
+    uint16_t nsymb = (ue->frame_parms.Ncp==0) ? 14:12;
+    uint16_t symbol_offset = (int)ue->frame_parms.ofdm_symbol_size*((subframe_tx*nsymb)+(nsymb-1));
+    generate_srs(&ue->frame_parms, 
+		 &ue->soundingrs_ul_config_dedicated[eNB_id], 
+		 &ue->common_vars.txdataF[eNB_id][symbol_offset], 
+		 tx_amp, 
+		 subframe_tx);
   }
 }
 

openair2/RRC/LITE/MESSAGES/asn1_msg.c

@@ -1593,7 +1593,7 @@ do_RRCConnectionSetup(
           SoundingRS_UL_ConfigDedicated__setup__srs_HoppingBandwidth_hbw0;
     physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.freqDomainPosition=0;
     physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.duration=1;
-    physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.srs_ConfigIndex=19;
+    physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.srs_ConfigIndex=2;
     physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.transmissionComb=0;
     physicalConfigDedicated2->soundingRS_UL_ConfigDedicated->choice.setup.cyclicShift=
           SoundingRS_UL_ConfigDedicated__setup__cyclicShift_cs0;

targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.tm1.usrpb210.conf

@@ -137,7 +137,7 @@ eNBs =
 
     ////////// MME parameters:
 
-    mme_ip_address      = ( { ipv4       = "192.168.12.26";
+    mme_ip_address      = ( { ipv4       = "192.168.12.70";
                               ipv6       = "192:168:30::17";
                               active     = "yes";
                               preference = "ipv4";