created new directories for NBIoT and NR and split eNB/gNB/UE

openair1/PHY/LTE_UE_TRANSPORT/pcfich_ue.c

+/*
+ * 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/LTE_TRANSPORT/pcfich.c
+* \brief Top-level routines for generating and decoding  the PCFICH/CFI physical/transport channel V8.6 2009-03
+* \author R. Knopp
+* \date 2011
+* \version 0.1
+* \company Eurecom
+* \email: knopp@eurecom.fr
+* \note
+* \warning
+*/
+#include "PHY/defs.h"
+
+//#define DEBUG_PCFICH
+
+void generate_pcfich_reg_mapping(LTE_DL_FRAME_PARMS *frame_parms)
+{
+
+  uint16_t kbar = 6 * (frame_parms->Nid_cell %(2*frame_parms->N_RB_DL));
+  uint16_t first_reg;
+  uint16_t *pcfich_reg = frame_parms->pcfich_reg;
+
+  pcfich_reg[0] = kbar/6;
+  first_reg = pcfich_reg[0];
+
+  frame_parms->pcfich_first_reg_idx=0;
+
+  pcfich_reg[1] = ((kbar + (frame_parms->N_RB_DL>>1)*6)%(frame_parms->N_RB_DL*12))/6;
+
+  if (pcfich_reg[1] < pcfich_reg[0]) {
+    frame_parms->pcfich_first_reg_idx = 1;
+    first_reg = pcfich_reg[1];
+  }
+
+  pcfich_reg[2] = ((kbar + (frame_parms->N_RB_DL)*6)%(frame_parms->N_RB_DL*12))/6;
+
+  if (pcfich_reg[2] < first_reg) {
+    frame_parms->pcfich_first_reg_idx = 2;
+    first_reg = pcfich_reg[2];
+  }
+
+  pcfich_reg[3] = ((kbar + ((3*frame_parms->N_RB_DL)>>1)*6)%(frame_parms->N_RB_DL*12))/6;
+
+  if (pcfich_reg[3] < first_reg) {
+    frame_parms->pcfich_first_reg_idx = 3;
+    first_reg = pcfich_reg[3];
+  }
+
+
+  //#ifdef DEBUG_PCFICH
+  printf("pcfich_reg : %d,%d,%d,%d\n",pcfich_reg[0],pcfich_reg[1],pcfich_reg[2],pcfich_reg[3]);
+  //#endif
+}
+
+void pcfich_scrambling(LTE_DL_FRAME_PARMS *frame_parms,
+                       uint8_t subframe,
+                       uint8_t *b,
+                       uint8_t *bt)
+{
+  uint32_t i;
+  uint8_t reset;
+  uint32_t x1, x2, s=0;
+
+  reset = 1;
+  // x1 is set in lte_gold_generic
+  x2 = ((((2*frame_parms->Nid_cell)+1)*(1+subframe))<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.7.1
+
+  for (i=0; i<32; i++) {
+    if ((i&0x1f)==0) {
+      s = lte_gold_generic(&x1, &x2, reset);
+      //printf("lte_gold[%d]=%x\n",i,s);
+      reset = 0;
+    }
+
+    bt[i] = (b[i]&1) ^ ((s>>(i&0x1f))&1);
+  }
+}
+
+void pcfich_unscrambling(LTE_DL_FRAME_PARMS *frame_parms,
+                         uint8_t subframe,
+                         int16_t *d)
+{
+
+  uint32_t i;
+  uint8_t reset;
+  uint32_t x1, x2, s=0;
+
+  reset = 1;
+  // x1 is set in lte_gold_generic
+  x2 = ((((2*frame_parms->Nid_cell)+1)*(1+subframe))<<9) + frame_parms->Nid_cell; //this is c_init in 36.211 Sec 6.7.1
+
+  for (i=0; i<32; i++) {
+    if ((i&0x1f)==0) {
+      s = lte_gold_generic(&x1, &x2, reset);
+      //printf("lte_gold[%d]=%x\n",i,s);
+      reset = 0;
+    }
+
+    if (((s>>(i&0x1f))&1) == 1)
+      d[i]=-d[i];
+
+  }
+}
+
+uint8_t pcfich_b[4][32]= {{0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1},
+  {1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0},
+  {1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1},
+  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
+};
+
+void generate_pcfich(uint8_t num_pdcch_symbols,
+                     int16_t amp,
+                     LTE_DL_FRAME_PARMS *frame_parms,
+                     int32_t **txdataF,
+                     uint8_t subframe)
+{
+
+  uint8_t pcfich_bt[32],nsymb,pcfich_quad;
+  int32_t pcfich_d[2][16];
+  uint8_t i;
+  uint32_t symbol_offset,m,re_offset,reg_offset;
+  int16_t gain_lin_QPSK;
+  uint16_t *pcfich_reg = frame_parms->pcfich_reg;
+
+  int nushiftmod3 = frame_parms->nushift%3;
+#ifdef DEBUG_PCFICH
+  LOG_D(PHY,"Generating PCFICH in subfrmae %d for %d PDCCH symbols, AMP %d, p %d, Ncp %d\n",
+	subframe,num_pdcch_symbols,amp,frame_parms->nb_antenna_ports_eNB,frame_parms->Ncp);
+#endif
+
+  // scrambling
+  if ((num_pdcch_symbols>0) && (num_pdcch_symbols<4))
+    pcfich_scrambling(frame_parms,subframe,pcfich_b[num_pdcch_symbols-1],pcfich_bt);
+
+  // modulation
+  if (frame_parms->nb_antenna_ports_eNB==1)
+    gain_lin_QPSK = (int16_t)((amp*ONE_OVER_SQRT2_Q15)>>15);
+  else
+    gain_lin_QPSK = amp/2;
+
+  if (frame_parms->nb_antenna_ports_eNB==1) { // SISO
+
+    for (i=0; i<16; i++) {
+      ((int16_t*)(&(pcfich_d[0][i])))[0]   = ((pcfich_bt[2*i] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      ((int16_t*)(&(pcfich_d[1][i])))[0]   = ((pcfich_bt[2*i] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      ((int16_t*)(&(pcfich_d[0][i])))[1]   = ((pcfich_bt[2*i+1] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      ((int16_t*)(&(pcfich_d[1][i])))[1]   = ((pcfich_bt[2*i+1] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+    }
+  } else { // ALAMOUTI
+    for (i=0; i<16; i+=2) {
+      // first antenna position n -> x0
+      ((int16_t*)(&(pcfich_d[0][i])))[0]   = ((pcfich_bt[2*i] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      ((int16_t*)(&(pcfich_d[0][i])))[1]   = ((pcfich_bt[2*i+1] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      // second antenna position n -> -x1*
+      ((int16_t*)(&(pcfich_d[1][i])))[0]   = ((pcfich_bt[2*i+2] == 1) ? gain_lin_QPSK : -gain_lin_QPSK);
+      ((int16_t*)(&(pcfich_d[1][i])))[1]   = ((pcfich_bt[2*i+3] == 1) ? -gain_lin_QPSK : gain_lin_QPSK);
+      // fill in the rest of the ALAMOUTI precoding
+      ((int16_t*)&pcfich_d[0][i+1])[0] = -((int16_t*)&pcfich_d[1][i])[0];
+      ((int16_t*)&pcfich_d[0][i+1])[1] =  ((int16_t*)&pcfich_d[1][i])[1];
+      ((int16_t*)&pcfich_d[1][i+1])[0] =  ((int16_t*)&pcfich_d[0][i])[0];
+      ((int16_t*)&pcfich_d[1][i+1])[1] = -((int16_t*)&pcfich_d[0][i])[1];
+
+
+    }
+  }
+
+
+  // mapping
+  nsymb = (frame_parms->Ncp==0) ? 14:12;
+
+  symbol_offset = (uint32_t)frame_parms->ofdm_symbol_size*(subframe*nsymb);
+  re_offset = frame_parms->first_carrier_offset;
+
+  // loop over 4 quadruplets and lookup REGs
+  m=0;
+
+  for (pcfich_quad=0; pcfich_quad<4; pcfich_quad++) {
+    reg_offset = re_offset+((uint16_t)pcfich_reg[pcfich_quad]*6);
+
+    if (reg_offset>=frame_parms->ofdm_symbol_size)
+      reg_offset=1 + reg_offset-frame_parms->ofdm_symbol_size;
+
+    for (i=0; i<6; i++) {
+      if ((i!=nushiftmod3)&&(i!=(nushiftmod3+3))) {
+        txdataF[0][symbol_offset+reg_offset+i] = pcfich_d[0][m];
+
+        if (frame_parms->nb_antenna_ports_eNB>1)
+          txdataF[1][symbol_offset+reg_offset+i] = pcfich_d[1][m];
+
+        m++;
+      }
+    }
+  }
+
+}
+
+
+uint8_t rx_pcfich(LTE_DL_FRAME_PARMS *frame_parms,
+                  uint8_t subframe,
+                  LTE_UE_PDCCH *lte_ue_pdcch_vars,
+                  MIMO_mode_t mimo_mode)
+{
+
+  uint8_t pcfich_quad;
+  uint8_t i,j;
+  uint16_t reg_offset;
+
+  int32_t **rxdataF_comp = lte_ue_pdcch_vars->rxdataF_comp;
+  int16_t pcfich_d[32],*pcfich_d_ptr;
+  int32_t metric,old_metric=-16384;
+  uint8_t num_pdcch_symbols=3;
+  uint16_t *pcfich_reg = frame_parms->pcfich_reg;
+
+  // demapping
+  // loop over 4 quadruplets and lookup REGs
+  //  m=0;
+  pcfich_d_ptr = pcfich_d;
+
+  for (pcfich_quad=0; pcfich_quad<4; pcfich_quad++) {
+    reg_offset = (pcfich_reg[pcfich_quad]*4);
+
+    for (i=0; i<4; i++) {
+
+      pcfich_d_ptr[0] = ((int16_t*)&rxdataF_comp[0][reg_offset+i])[0]; // RE component
+      pcfich_d_ptr[1] = ((int16_t*)&rxdataF_comp[0][reg_offset+i])[1]; // IM component
+#ifdef DEBUG_PCFICH      
+      printf("rx_pcfich: quad %d, i %d, offset %d =>  (%d,%d) => pcfich_d_ptr[0] %d \n",pcfich_quad,i,reg_offset+i,
+             ((int16_t*)&rxdataF_comp[0][reg_offset+i])[0],
+             ((int16_t*)&rxdataF_comp[0][reg_offset+i])[1],
+             pcfich_d_ptr[0]);
+#endif
+      pcfich_d_ptr+=2;
+    }
+
+    /*
+    }
+    else { // ALAMOUTI
+    for (i=0;i<4;i+=2) {
+    pcfich_d_ptr[0] = 0;
+    pcfich_d_ptr[1] = 0;
+    pcfich_d_ptr[2] = 0;
+    pcfich_d_ptr[3] = 0;
+    for (j=0;j<frame_parms->nb_antennas_rx;j++) {
+
+    pcfich_d_ptr[0] += (((int16_t*)&rxdataF_comp[j][reg_offset+i])[0]+
+         ((int16_t*)&rxdataF_comp[j+2][reg_offset+i+1])[0]); // RE component
+    pcfich_d_ptr[1] += (((int16_t*)&rxdataF_comp[j][reg_offset+i])[1] -
+         ((int16_t*)&rxdataF_comp[j+2][reg_offset+i+1])[1]);// IM component
+
+    pcfich_d_ptr[2] += (((int16_t*)&rxdataF_comp[j][reg_offset+i+1])[0]-
+         ((int16_t*)&rxdataF_comp[j+2][reg_offset+i])[0]); // RE component
+    pcfich_d_ptr[3] += (((int16_t*)&rxdataF_comp[j][reg_offset+i+1])[1] +
+         ((int16_t*)&rxdataF_comp[j+2][reg_offset+i])[1]);// IM component
+
+
+    }
+
+    pcfich_d_ptr+=4;
+
+    }
+    */
+  }
+
+  // pcfhich unscrambling
+
+  pcfich_unscrambling(frame_parms,subframe,pcfich_d);
+
+  // pcfich detection
+
+  for (i=0; i<3; i++) {
+    metric = 0;
+
+    for (j=0; j<32; j++) {
+      //      printf("pcfich_b[%d][%d] %d => pcfich_d[%d] %d\n",i,j,pcfich_b[i][j],j,pcfich_d[j]);
+      metric += (int32_t)(((pcfich_b[i][j]==0) ? (pcfich_d[j]) : (-pcfich_d[j])));
+    }
+
+#ifdef DEBUG_PCFICH
+    printf("metric %d : %d\n",i,metric);
+#endif
+
+    if (metric > old_metric) {
+      num_pdcch_symbols = 1+i;
+      old_metric = metric;
+    }
+  }
+
+#ifdef DEBUG_PCFICH
+  printf("[PHY] PCFICH detected for %d PDCCH symbols\n",num_pdcch_symbols);
+#endif
+  return(num_pdcch_symbols);
+}

openair1/PHY/LTE_UE_TRANSPORT/pch_ue.c

+/*
+ * 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
+ */
+
+#include "PHY/defs.h"
+#include "PHY/extern.h"
+#include "assertions.h"
+
+const unsigned int Ttab[4] = {32,64,128,256};
+
+// This function implements the initialization of paging parameters for UE (See Section 7, 36.304)
+// It must be called after setting IMSImod1024 during UE startup and after receiving SIB2
+int init_ue_paging_info(PHY_VARS_UE *ue, long defaultPagingCycle, long nB) {
+
+   LTE_DL_FRAME_PARMS *fp = &ue->frame_parms;
+
+   unsigned int T         = Ttab[defaultPagingCycle];
+   unsigned int N         = (nB<=2) ? T : (T>>(nB-2));
+   unsigned int Ns        = (nB<2)  ? (1<<(2-nB)) : 1;
+   unsigned int UE_ID     = ue->IMSImod1024;
+   unsigned int i_s       = (UE_ID/N)%Ns;
+
+   
+   ue->PF = (T/N) * (UE_ID % N);
+
+   // This implements Section 7.2 from 36.304
+   if (Ns==1)
+     ue->PO = (fp->frame_type==FDD) ? 9 : 0; 
+   else if (Ns==2)
+     ue->PO = (fp->frame_type==FDD) ? (4+(5*i_s)) : (5*i_s); 
+   else if (Ns==4)
+     ue->PO = (fp->frame_type==FDD) ? (4*(i_s&1)+(5*(i_s>>1))) : ((i_s&1)+(5*(i_s>>1))); 
+   else
+     AssertFatal(1==0,"init_ue_paging_info: Ns is %d\n",Ns);
+
+   return(0);
+}