Merge remote-tracking branch 'origin/symbol-duration-functions' into integration_2025_w50 (!3808)

Add symbol timing functions for NR_DL_FRAME_PARMS + optimization for slot timing
counterparts

Add two new functions for calculation symbol timestamp and symbol duration for
NR_DL_FRAME_PARMS. Also includes an optimization focused on removing
inefficiencies related slot-related counterparts.

openair1/PHY/CMakeLists.txt

@@ -3,3 +3,6 @@ add_subdirectory(TOOLS)
 add_subdirectory(NR_TRANSPORT)
 add_subdirectory(CODING)
 add_subdirectory(MODULATION)
+if (ENABLE_TESTS)
+  add_subdirectory(INIT/tests)
+endif()

openair1/PHY/INIT/nr_parms.c

@@ -259,33 +259,116 @@ uint32_t get_samples_per_slot(int slot, const NR_DL_FRAME_PARMS *fp)
   return samp_count;
 }
 
-uint32_t get_slot_from_timestamp(openair0_timestamp timestamp_rx, const NR_DL_FRAME_PARMS *fp)
+uint32_t get_samples_symbol_duration(const NR_DL_FRAME_PARMS *fp, int slot, int start_symbol, int num_symbols)
 {
-   uint32_t slot_idx = 0;
-   int samples_till_the_slot = fp->get_samples_per_slot(slot_idx,fp)-1;
-   timestamp_rx = timestamp_rx%fp->samples_per_frame;
+  int end_symbol = start_symbol + num_symbols - 1;
+  AssertFatal(start_symbol <= end_symbol && start_symbol >= 0 && end_symbol < fp->symbols_per_slot,
+              "Symbol range is invalid start_symbol %d, num_symbols %d symbols_per_slot %d\n",
+              start_symbol,
+              num_symbols,
+              fp->symbols_per_slot);
+  if (num_symbols == fp->symbols_per_slot) {
+    return get_samples_per_slot(slot, fp);
+  }
+  uint32_t num_samples = 0;
+  int num_symbols_added = 0;
 
-    while (timestamp_rx > samples_till_the_slot) {
-        slot_idx++;
-        samples_till_the_slot += fp->get_samples_per_slot(slot_idx,fp);
-     }
-   return slot_idx; 
+  // Handle symbols with different nb_prefix_samples0
+  if (fp->numerology_index == 0) {
+    // Add symbol 0
+    if (start_symbol == 0) {
+      num_samples += fp->nb_prefix_samples0 + fp->ofdm_symbol_size;
+      num_symbols_added++;
+    }
+    // Add symbol 7
+    if (start_symbol <= 7 && end_symbol >= 7) {
+      num_samples += fp->nb_prefix_samples0 + fp->ofdm_symbol_size;
+      num_symbols_added++;
+    }
+  } else {
+    // Add first symbol
+    if (start_symbol == 0) {
+      num_samples += (slot % (fp->slots_per_subframe / 2)) ? fp->nb_prefix_samples : fp->nb_prefix_samples0;
+      num_samples += fp->ofdm_symbol_size;
+      num_symbols_added++;
+    }
+  }
+
+  int num_symbols_left = max(0, num_symbols - num_symbols_added);
+  num_samples += num_symbols_left * (fp->nb_prefix_samples + fp->ofdm_symbol_size);
+  return num_samples;
 }
 
-uint32_t get_samples_slot_timestamp(int slot, const NR_DL_FRAME_PARMS *fp, unsigned int sl_ahead)
+uint32_t get_samples_symbol_timestamp(const NR_DL_FRAME_PARMS *fp, int slot, int symbol)
 {
-  uint32_t samp_count = 0;
-
-  if(!sl_ahead) {
-    for(unsigned int idx_slot = 0; idx_slot < slot; idx_slot++)
-      samp_count += fp->get_samples_per_slot(idx_slot, fp);
-  } else {
-    for (unsigned int idx_slot = slot; idx_slot < slot + sl_ahead; idx_slot++)
-      samp_count += fp->get_samples_per_slot(idx_slot, fp);
+  if (symbol == 0) {
+    return 0;
   }
+
+  return get_samples_symbol_duration(fp, slot, 0, symbol);
+}
+
+uint32_t get_slot_from_timestamp(openair0_timestamp timestamp_rx, const NR_DL_FRAME_PARMS *fp)
+{
+  timestamp_rx = timestamp_rx % fp->samples_per_frame;
+  if (timestamp_rx < fp->samples_per_slot0)
+    return 0;
+
+  if (fp->numerology_index == 0)
+    return timestamp_rx / fp->samples_per_subframe;
+
+  const unsigned int num_half_sf = timestamp_rx / (fp->samples_per_subframe / 2);
+  const unsigned int slot_per_half_sf = fp->slots_per_subframe / 2;
+
+  uint32_t slot_count = num_half_sf * slot_per_half_sf;
+  int samp_idx = num_half_sf * (fp->samples_per_subframe / 2) - 1;
+
+  // Remaining samples
+  if (samp_idx < timestamp_rx) {
+    slot_count++;
+    samp_idx += fp->samples_per_slot0; // First slot of half subframe
+  }
+  if (samp_idx < timestamp_rx) {
+    const unsigned int rem_samples = timestamp_rx - samp_idx;
+    const unsigned int num_slots = ceil((double)rem_samples / fp->samples_per_slotN0);
+    slot_count += num_slots;
+  }
+
+  return slot_count - 1;
+}
+
+uint32_t get_samples_slot_timestamp(const NR_DL_FRAME_PARMS *fp, unsigned int slot)
+{
+  if (slot == 0)
+    return 0;
+
+  if (fp->numerology_index == 0)
+    return slot * fp->samples_per_subframe;
+
+  uint32_t samp_count = 0;
+  // Number of half subframes
+  const unsigned int num_half_sf = slot / (fp->slots_per_subframe / 2);
+  samp_count += num_half_sf * fp->samples_per_subframe / 2;
+
+  // Remaining slots
+  unsigned int rem_slots = slot % (fp->slots_per_subframe / 2);
+  if (rem_slots > 0) {
+    samp_count += fp->samples_per_slot0; // First slot of the last half subframe
+    rem_slots--;
+  }
+  samp_count += rem_slots * fp->samples_per_slotN0; // Remaining slots of the last half subframe
+
   return samp_count;
 }
 
+uint32_t get_samples_slot_duration(const NR_DL_FRAME_PARMS *fp, unsigned int start_slot, unsigned int num_slots)
+{
+  if (start_slot == 0 && num_slots == 0)
+    return 0;
+
+  return (get_samples_slot_timestamp(fp, start_slot + num_slots) - get_samples_slot_timestamp(fp, start_slot));
+}
+
 void nr_init_frame_parms(nfapi_nr_config_request_scf_t* cfg, NR_DL_FRAME_PARMS *fp)
 {
 
@@ -319,12 +402,11 @@ void nr_init_frame_parms(nfapi_nr_config_request_scf_t* cfg, NR_DL_FRAME_PARMS *
   fp->samples_per_frame_wCP = 10 * fp->samples_per_subframe_wCP;
   fp->samples_per_slot_wCP = fp->symbols_per_slot*fp->ofdm_symbol_size; 
   fp->samples_per_slotN0 = (fp->nb_prefix_samples + fp->ofdm_symbol_size) * fp->symbols_per_slot;
-  fp->samples_per_slot0 = fp->nb_prefix_samples0 + ((fp->symbols_per_slot-1)*fp->nb_prefix_samples) + (fp->symbols_per_slot*fp->ofdm_symbol_size); 
-  fp->samples_per_subframe = (fp->nb_prefix_samples0 + fp->ofdm_symbol_size) * 2 + 
-                             (fp->nb_prefix_samples + fp->ofdm_symbol_size) * (fp->symbols_per_slot * fp->slots_per_subframe - 2); 
-  fp->get_samples_per_slot = &get_samples_per_slot;
-  fp->get_samples_slot_timestamp = &get_samples_slot_timestamp;
-  fp->get_slot_from_timestamp = &get_slot_from_timestamp;
+  fp->samples_per_subframe = (fp->nb_prefix_samples0 + fp->ofdm_symbol_size) * 2
+                             + (fp->nb_prefix_samples + fp->ofdm_symbol_size) * (fp->symbols_per_slot * fp->slots_per_subframe - 2);
+  fp->samples_per_slot0 = fp->numerology_index == 0 ? fp->samples_per_subframe
+                                                    : fp->nb_prefix_samples0 + ((fp->symbols_per_slot - 1) * fp->nb_prefix_samples)
+                                                          + (fp->symbols_per_slot * fp->ofdm_symbol_size);
   fp->samples_per_frame = 10 * fp->samples_per_subframe;
   fp->freq_range = get_freq_range_from_freq(fp->dl_CarrierFreq);
 
@@ -402,11 +484,11 @@ int nr_init_frame_parms_ue(NR_DL_FRAME_PARMS *fp,
   fp->samples_per_frame_wCP = 10 * fp->samples_per_subframe_wCP;
   fp->samples_per_slot_wCP = fp->symbols_per_slot*fp->ofdm_symbol_size; 
   fp->samples_per_slotN0 = (fp->nb_prefix_samples + fp->ofdm_symbol_size) * fp->symbols_per_slot;
-  fp->samples_per_slot0 = fp->nb_prefix_samples0 + ((fp->symbols_per_slot-1)*fp->nb_prefix_samples) + (fp->symbols_per_slot*fp->ofdm_symbol_size); 
-  fp->samples_per_subframe = (fp->nb_prefix_samples0 + fp->ofdm_symbol_size) * 2 + 
-                             (fp->nb_prefix_samples + fp->ofdm_symbol_size) * (fp->symbols_per_slot * fp->slots_per_subframe - 2); 
-  fp->get_samples_per_slot = &get_samples_per_slot;
-  fp->get_samples_slot_timestamp = &get_samples_slot_timestamp;
+  fp->samples_per_subframe = (fp->nb_prefix_samples0 + fp->ofdm_symbol_size) * 2
+                             + (fp->nb_prefix_samples + fp->ofdm_symbol_size) * (fp->symbols_per_slot * fp->slots_per_subframe - 2);
+  fp->samples_per_slot0 = fp->numerology_index == 0 ? fp->samples_per_subframe
+                                                    : fp->nb_prefix_samples0 + ((fp->symbols_per_slot - 1) * fp->nb_prefix_samples)
+                                                          + (fp->symbols_per_slot * fp->ofdm_symbol_size);
   fp->samples_per_frame = 10 * fp->samples_per_subframe;
   fp->freq_range = get_freq_range_from_freq(fp->dl_CarrierFreq);
 
@@ -460,11 +542,14 @@ void nr_init_frame_parms_ue_sa(NR_DL_FRAME_PARMS *frame_parms, uint64_t downlink
   frame_parms->samples_per_frame_wCP = 10 * frame_parms->samples_per_subframe_wCP;
   frame_parms->samples_per_slot_wCP = frame_parms->symbols_per_slot*frame_parms->ofdm_symbol_size;
   frame_parms->samples_per_slotN0 = (frame_parms->nb_prefix_samples + frame_parms->ofdm_symbol_size) * frame_parms->symbols_per_slot;
-  frame_parms->samples_per_slot0 = frame_parms->nb_prefix_samples0 + ((frame_parms->symbols_per_slot-1)*frame_parms->nb_prefix_samples) + (frame_parms->symbols_per_slot*frame_parms->ofdm_symbol_size);
-  frame_parms->samples_per_subframe = (frame_parms->nb_prefix_samples0 + frame_parms->ofdm_symbol_size) * 2 +
-                             (frame_parms->nb_prefix_samples + frame_parms->ofdm_symbol_size) * (frame_parms->symbols_per_slot * frame_parms->slots_per_subframe - 2);
-  frame_parms->get_samples_per_slot = &get_samples_per_slot;
-  frame_parms->get_samples_slot_timestamp = &get_samples_slot_timestamp;
+  frame_parms->samples_per_subframe = (frame_parms->nb_prefix_samples0 + frame_parms->ofdm_symbol_size) * 2
+                                      + (frame_parms->nb_prefix_samples + frame_parms->ofdm_symbol_size)
+                                            * (frame_parms->symbols_per_slot * frame_parms->slots_per_subframe - 2);
+  frame_parms->samples_per_slot0 = frame_parms->numerology_index == 0
+                                       ? frame_parms->samples_per_subframe
+                                       : frame_parms->nb_prefix_samples0
+                                             + ((frame_parms->symbols_per_slot - 1) * frame_parms->nb_prefix_samples)
+                                             + (frame_parms->symbols_per_slot * frame_parms->ofdm_symbol_size);
   frame_parms->samples_per_frame = 10 * frame_parms->samples_per_subframe;
 
   LOG_W(PHY, "samples_per_subframe %d/per second %d, wCP %d\n", frame_parms->samples_per_subframe, 1000*frame_parms->samples_per_subframe, frame_parms->samples_per_subframe_wCP);
@@ -560,12 +645,11 @@ int nr_init_frame_parms_ue_sl(NR_DL_FRAME_PARMS *fp,
   fp->samples_per_frame_wCP = 10 * fp->samples_per_subframe_wCP;
   fp->samples_per_slot_wCP = fp->symbols_per_slot * fp->ofdm_symbol_size;
   fp->samples_per_slotN0 = (fp->nb_prefix_samples + fp->ofdm_symbol_size) * fp->symbols_per_slot;
-  fp->samples_per_slot0 =
-      fp->nb_prefix_samples0 + ((fp->symbols_per_slot - 1) * fp->nb_prefix_samples) + (fp->symbols_per_slot * fp->ofdm_symbol_size);
   fp->samples_per_subframe = (fp->nb_prefix_samples0 + fp->ofdm_symbol_size) * 2
                              + (fp->nb_prefix_samples + fp->ofdm_symbol_size) * (fp->symbols_per_slot * fp->slots_per_subframe - 2);
-  fp->get_samples_per_slot = &get_samples_per_slot;
-  fp->get_samples_slot_timestamp = &get_samples_slot_timestamp;
+  fp->samples_per_slot0 = fp->numerology_index == 0 ? fp->samples_per_subframe
+                                                    : fp->nb_prefix_samples0 + ((fp->symbols_per_slot - 1) * fp->nb_prefix_samples)
+                                                          + (fp->symbols_per_slot * fp->ofdm_symbol_size);
   fp->samples_per_frame = 10 * fp->samples_per_subframe;
   fp->freq_range = get_freq_range_from_freq(fp->sl_CarrierFreq);
 

openair1/PHY/INIT/nr_phy_init.h

@@ -55,10 +55,11 @@ void free_nr_ue_ul_harq(NR_UL_UE_HARQ_t harq_list[NR_MAX_ULSCH_HARQ_PROCESSES],
 
 void phy_init_nr_top(PHY_VARS_NR_UE *ue);
 void phy_term_nr_top(void);
+#ifndef __cplusplus
 void init_delay_table(uint16_t ofdm_symbol_size,
                       int max_delay_comp,
                       int max_ofdm_symbol_size,
                       c16_t delay_table[][max_ofdm_symbol_size]);
-
+#endif
 void sl_ue_phy_init(PHY_VARS_NR_UE *UE);
 #endif

openair1/PHY/INIT/tests/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(test_nr_frame_params test_nr_frame_params.cpp)
+target_link_libraries(test_nr_frame_params PRIVATE LOG minimal_lib PHY_NR -lm GTest::gtest)

openair1/PHY/INIT/tests/test_nr_frame_params.cpp

@@ -0,0 +1,177 @@
+/*
+ * 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 "gtest/gtest.h"
+extern "C" {
+#include <stdlib.h>
+#include "openair1/PHY/defs_nr_common.h"
+#include "openair1/PHY/INIT/nr_phy_init.h"
+
+static softmodem_params_t softmodem_params;
+softmodem_params_t *get_softmodem_params(void)
+{
+  return &softmodem_params;
+}
+}
+
+uint32_t ref_get_samples_slot_timestamp(NR_DL_FRAME_PARMS *fp, unsigned int slot)
+{
+  uint32_t samp_count = 0;
+  for (unsigned int i = 0; i < slot; i++) {
+    samp_count += get_samples_per_slot(i, fp);
+  }
+  return samp_count;
+}
+
+uint32_t ref_get_slot_from_timestamp(openair0_timestamp ts, NR_DL_FRAME_PARMS *fp)
+{
+  uint32_t slot_idx = 0;
+  int samples_till_the_slot = get_samples_per_slot(slot_idx, fp) - 1;
+  ts = ts % fp->samples_per_frame;
+
+  while (ts > samples_till_the_slot) {
+    slot_idx++;
+    samples_till_the_slot += get_samples_per_slot(slot_idx, fp);
+  }
+  return slot_idx;
+}
+
+void test_coherence_symbol_api(NR_DL_FRAME_PARMS *fp)
+{
+  EXPECT_EQ(get_samples_symbol_timestamp(fp, 0, 0), get_samples_slot_timestamp(fp, 0));
+
+  for (int slot = 0; slot < 4; slot++) {
+    EXPECT_EQ(get_samples_symbol_duration(fp, slot, 0, fp->symbols_per_slot) + get_samples_slot_timestamp(fp, slot),
+              get_samples_slot_timestamp(fp, slot + 1));
+  }
+
+  for (int symbol = 0; symbol < fp->symbols_per_slot - 1; symbol++) {
+    EXPECT_EQ(get_samples_symbol_timestamp(fp, 0, symbol + 1) - get_samples_symbol_timestamp(fp, 0, symbol),
+              get_samples_symbol_duration(fp, 0, symbol, 1));
+  }
+}
+
+void test_coherence_slot_api(NR_DL_FRAME_PARMS *fp)
+{
+  for (unsigned int slot = 0; slot < fp->slots_per_frame; slot++) {
+    EXPECT_EQ(get_samples_slot_timestamp(fp, slot), ref_get_samples_slot_timestamp(fp, slot));
+  }
+
+  openair0_timestamp ts = get_samples_per_slot(0, fp);
+  // When timestamp is the last sample of the slot
+  EXPECT_EQ(get_slot_from_timestamp(ts - 1, fp), 0);
+  for (unsigned int slot = 0; slot < fp->slots_per_frame; slot++) {
+    // When timestamp is the first sample of the slot
+    ts = ref_get_samples_slot_timestamp(fp, slot);
+    EXPECT_EQ(get_slot_from_timestamp(ts, fp), slot);
+    // When timestamp is anywhere in the slot
+    ts += (rand() % fp->samples_per_slotN0);
+    EXPECT_EQ(get_slot_from_timestamp(ts, fp), slot);
+  }
+}
+
+TEST(nr_frame_params, test_mu_3)
+{
+  NR_DL_FRAME_PARMS fp;
+  int mu = NR_MU_3;
+  memset(&fp, 0, sizeof(fp));
+  nfapi_nr_config_request_scf_t cfg;
+  cfg.carrier_config.num_rx_ant.value = 4;
+  cfg.carrier_config.num_tx_ant.value = 4;
+  cfg.carrier_config.dl_grid_size[mu].value = 66;
+  cfg.carrier_config.ul_grid_size[mu].value = 66;
+  cfg.cell_config.frame_duplex_type.value = TDD;
+  cfg.ssb_config.scs_common.value = mu;
+  fp.dl_CarrierFreq = 27524520000;
+  fp.nr_band = 261;
+  nr_init_frame_parms(&cfg, &fp);
+  nr_dump_frame_parms(&fp);
+  test_coherence_symbol_api(&fp);
+  test_coherence_slot_api(&fp);
+}
+
+TEST(nr_frame_params, test_mu_2)
+{
+  NR_DL_FRAME_PARMS fp;
+  int mu = NR_MU_2;
+  memset(&fp, 0, sizeof(fp));
+  nfapi_nr_config_request_scf_t cfg;
+  cfg.carrier_config.num_rx_ant.value = 4;
+  cfg.carrier_config.num_tx_ant.value = 4;
+  cfg.carrier_config.dl_grid_size[mu].value = 51;
+  cfg.carrier_config.ul_grid_size[mu].value = 51;
+  cfg.cell_config.frame_duplex_type.value = TDD;
+  cfg.ssb_config.scs_common.value = mu;
+  fp.dl_CarrierFreq = 27524520000;
+  fp.nr_band = 261;
+  nr_init_frame_parms(&cfg, &fp);
+  nr_dump_frame_parms(&fp);
+  test_coherence_symbol_api(&fp);
+  test_coherence_slot_api(&fp);
+}
+
+TEST(nr_frame_params, test_mu_1)
+{
+  NR_DL_FRAME_PARMS fp;
+  int mu = NR_MU_1;
+  memset(&fp, 0, sizeof(fp));
+  nfapi_nr_config_request_scf_t cfg;
+  cfg.carrier_config.num_rx_ant.value = 4;
+  cfg.carrier_config.num_tx_ant.value = 4;
+  cfg.carrier_config.dl_grid_size[mu].value = 106;
+  cfg.carrier_config.ul_grid_size[mu].value = 106;
+  cfg.cell_config.frame_duplex_type.value = TDD;
+  cfg.ssb_config.scs_common.value = mu;
+  fp.dl_CarrierFreq = 3600000000;
+  fp.nr_band = 78;
+  nr_init_frame_parms(&cfg, &fp);
+  nr_dump_frame_parms(&fp);
+  test_coherence_symbol_api(&fp);
+  test_coherence_slot_api(&fp);
+}
+
+TEST(nr_frame_params, test_mu_0)
+{
+  int mu = NR_MU_0;
+  NR_DL_FRAME_PARMS fp;
+  memset(&fp, 0, sizeof(fp));
+  nfapi_nr_config_request_scf_t cfg;
+  cfg.carrier_config.num_rx_ant.value = 4;
+  cfg.carrier_config.num_tx_ant.value = 4;
+  cfg.carrier_config.dl_grid_size[mu].value = 216;
+  cfg.carrier_config.ul_grid_size[mu].value = 216;
+  cfg.cell_config.frame_duplex_type.value = TDD;
+  cfg.ssb_config.scs_common.value = mu;
+  fp.dl_CarrierFreq = 2600000000;
+  fp.nr_band = 38;
+  nr_init_frame_parms(&cfg, &fp);
+  nr_dump_frame_parms(&fp);
+  test_coherence_symbol_api(&fp);
+  test_coherence_slot_api(&fp);
+}
+
+int main(int argc, char **argv)
+{
+  uniqCfg = load_configmodule(argc, argv, CONFIG_ENABLECMDLINEONLY);
+  logInit();
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}

openair1/PHY/MODULATION/slot_fep_nr.c

@@ -80,7 +80,7 @@ int nr_slot_fep(PHY_VARS_NR_UE *ue,
   // For Sidelink 16 frames worth of samples is processed to find SSB, for 5G-NR 2.
   const unsigned int total_samples = (is_sl) ? 16 * frame_parms->samples_per_frame : 2 * frame_parms->samples_per_frame;
 
-  unsigned int rx_offset = frame_parms->get_samples_slot_timestamp(slot, frame_parms, 0);
+  unsigned int rx_offset = get_samples_slot_timestamp(frame_parms, slot);
   const unsigned int abs_symbol = slot * frame_parms->symbols_per_slot + symbol;
   for (int idx_symb = slot * frame_parms->symbols_per_slot; idx_symb <= abs_symbol; idx_symb++)
     rx_offset += (idx_symb % (0x7 << frame_parms->numerology_index)) ? nb_prefix_samples : nb_prefix_samples0;
@@ -150,7 +150,7 @@ int nr_slot_fep_ul(NR_DL_FRAME_PARMS *frame_parms,
   int32_t tmp_dft_in[8192] __attribute__ ((aligned (32)));
 
   // offset of first OFDM symbol
-  unsigned int rxdata_offset = frame_parms->get_samples_slot_timestamp(Ns,frame_parms,0);
+  unsigned int rxdata_offset = get_samples_slot_timestamp(frame_parms, Ns);
   unsigned int abs_symbol = Ns * frame_parms->symbols_per_slot + symbol;
   for (int idx_symb = Ns*frame_parms->symbols_per_slot; idx_symb <= abs_symbol; idx_symb++)
     rxdata_offset += (idx_symb%(0x7<<frame_parms->numerology_index)) ? nb_prefix_samples : nb_prefix_samples0;

openair1/PHY/NR_TRANSPORT/nr_prach.c

@@ -362,7 +362,7 @@ static void rx_nr_prach_ru_internal(prach_item_t *p,
     // Fixme: slot or slot makes no sense ???
     int slot2 = p->prach_sequence_length ? p->slot : p->slot;
     int idx = aa + beam_id * p->nb_rx;
-    c16_t *prach = (c16_t *)&rxdata[idx][fp->get_samples_slot_timestamp(slot2, fp, 0) + sample_offset_slot - N_TA_offset];
+    c16_t *prach = (c16_t *)&rxdata[idx][get_samples_slot_timestamp(fp, slot2) + sample_offset_slot - N_TA_offset];
 
     // do DFT
     c16_t *prach2 = prach + Ncp;

openair1/PHY/defs_nr_common.h

@@ -165,11 +165,6 @@ void init_prach_list(prach_list_t *);
 
 typedef struct NR_DL_FRAME_PARMS NR_DL_FRAME_PARMS;
 
-typedef uint32_t (*get_samples_per_slot_t)(int slot, const NR_DL_FRAME_PARMS *fp);
-typedef uint32_t (*get_slot_from_timestamp_t)(openair0_timestamp timestamp_rx, const NR_DL_FRAME_PARMS *fp);
-
-typedef uint32_t (*get_samples_slot_timestamp_t)(int slot, const NR_DL_FRAME_PARMS *fp, unsigned int sl_ahead);
-
 struct NR_DL_FRAME_PARMS {
   /// frequency range
   frequency_range_t freq_range;
@@ -225,12 +220,6 @@ struct NR_DL_FRAME_PARMS {
   uint16_t slots_per_frame;
   /// Number of samples in a subframe
   uint32_t samples_per_subframe;
-  /// Number of samples in current slot
-  get_samples_per_slot_t get_samples_per_slot;
-  /// slot calculation from timestamp
-  get_slot_from_timestamp_t get_slot_from_timestamp;
-  /// Number of samples before slot
-  get_samples_slot_timestamp_t get_samples_slot_timestamp;
   /// Number of samples in 0th and center slot of a subframe
   uint32_t samples_per_slot0;
   /// Number of samples in other slots of the subframe
@@ -336,4 +325,17 @@ typedef struct {
 #define KHz (1000UL)
 #define MHz (1000*KHz)
 
+// Get symbol duration within slot in samples
+uint32_t get_samples_symbol_duration(const NR_DL_FRAME_PARMS *fp, int slot, int start_symbol, int num_symbols);
+// Get timestamp of symbol within slot in samples
+uint32_t get_samples_symbol_timestamp(const NR_DL_FRAME_PARMS *fp, int slot, int symbol);
+// Get slot duration between two slot
+uint32_t get_samples_slot_duration(const NR_DL_FRAME_PARMS *fp, unsigned int start_slot, unsigned int num_slots);
+// Get timestamp of slot from start of frame
+uint32_t get_samples_slot_timestamp(const NR_DL_FRAME_PARMS *fp, unsigned int slot);
+// Get slot from timestamp
+uint32_t get_slot_from_timestamp(openair0_timestamp timestamp_rx, const NR_DL_FRAME_PARMS *fp);
+// Get number of samples in the slot
+uint32_t get_samples_per_slot(int slot, const NR_DL_FRAME_PARMS *fp);
+
 #endif