Added partial NR time resource mapping tables

lib/include/srsran/phy/phch/prach.h

@@ -116,6 +116,21 @@ typedef struct SRSRAN_API {
   uint32_t sf[5];
 } srsran_prach_sf_config_t;
 
+///@brief Maximum number of subframe number candidates for PRACH NR configuration
+#define PRACH_NR_CFG_MAX_NOF_SF 5
+
+/**
+ * @brief PRACH configuration for NR as described in TS 38.211 Tables 6.3.3.2-2, 6.3.3.2-3 and 6.3.3.2-4
+ */
+typedef struct {
+  uint32_t preamble_format;
+  uint32_t x;
+  uint32_t y;
+  uint32_t subframe_number[PRACH_NR_CFG_MAX_NOF_SF];
+  uint32_t nof_subframe_number;
+  uint32_t starting_symbol; // subframe number
+} prach_nr_config_t;
+
 typedef enum SRSRAN_API {
   SRSRAN_PRACH_SFN_EVEN = 0,
   SRSRAN_PRACH_SFN_ANY,
@@ -160,6 +175,12 @@ SRSRAN_API bool srsran_prach_tti_opportunity_config_tdd(uint32_t  config_idx,
                                                         uint32_t  current_tti,
                                                         uint32_t* prach_idx);
 
+SRSRAN_API const prach_nr_config_t* srsran_prach_nr_get_cfg_fr1_unpaired(uint32_t config_idx);
+
+SRSRAN_API bool srsran_prach_nr_tti_opportunity_fr1_unpaired(uint32_t config_idx, uint32_t current_tti);
+
+SRSRAN_API uint32_t srsran_prach_nr_start_symbol_fr1_unpaired(uint32_t config_idx);
+
 SRSRAN_API uint32_t srsran_prach_f_ra_tdd(uint32_t config_idx,
                                           uint32_t tdd_ul_dl_config,
                                           uint32_t current_tti,

lib/src/phy/phch/prach.c

@@ -114,6 +114,14 @@ srsran_prach_sfn_t srsran_prach_get_sfn(uint32_t config_idx)
  */
 bool srsran_prach_tti_opportunity(srsran_prach_t* p, uint32_t current_tti, int allowed_subframe)
 {
+  if (p == NULL) {
+    return false;
+  }
+
+  if (p->is_nr) {
+    return srsran_prach_nr_tti_opportunity_fr1_unpaired(p->config_idx, current_tti);
+  }
+
   uint32_t config_idx = p->config_idx;
   if (!p->tdd_config.configured) {
     return srsran_prach_tti_opportunity_config_fdd(config_idx, current_tti, allowed_subframe);
@@ -256,6 +264,66 @@ void srsran_prach_sf_config(uint32_t config_idx, srsran_prach_sf_config_t* sf_co
   memcpy(sf_config, &prach_sf_config[config_idx % 16], sizeof(srsran_prach_sf_config_t));
 }
 
+const prach_nr_config_t* srsran_prach_nr_get_cfg_fr1_unpaired(uint32_t config_idx)
+{
+  if (config_idx < PRACH_NR_CFG_FR1_UNPAIRED_NOF_CFG) {
+    return &prach_nr_cfg_fr1_unpaired[config_idx];
+  }
+
+  ERROR("Invalid configuration index %d", config_idx);
+  return NULL;
+}
+
+bool srsran_prach_nr_tti_opportunity_fr1_unpaired(uint32_t config_idx, uint32_t current_tti)
+{
+  uint32_t sfn    = current_tti / SRSRAN_NOF_SF_X_FRAME;
+  uint32_t sf_idx = current_tti % SRSRAN_NOF_SF_X_FRAME;
+
+  // Get configuration
+  const prach_nr_config_t* cfg = srsran_prach_nr_get_cfg_fr1_unpaired(config_idx);
+  if (cfg == NULL) {
+    return false;
+  }
+
+  // Protect zero division
+  if (cfg->x == 0) {
+    ERROR("Invalid Zero value");
+    return false;
+  }
+
+  // Check for System Frame Number match
+  if (sfn % cfg->x != cfg->y) {
+    return false;
+  }
+
+  // Protect subframe number vector access
+  if (cfg->nof_subframe_number > PRACH_NR_CFG_MAX_NOF_SF) {
+    ERROR("Invalid number of subframes (%d)", cfg->nof_subframe_number);
+    return false;
+  }
+
+  // Check for subframe number match
+  for (uint32_t i = 0; i < cfg->nof_subframe_number; i++) {
+    if (cfg->subframe_number[i] == sf_idx) {
+      return true;
+    }
+  }
+
+  // If reached here, no opportunity
+  return false;
+}
+
+uint32_t srsran_prach_nr_start_symbol_fr1_unpaired(uint32_t config_idx)
+{
+  // Get configuration
+  const prach_nr_config_t* cfg = srsran_prach_nr_get_cfg_fr1_unpaired(config_idx);
+  if (cfg == NULL) {
+    return false;
+  }
+
+  return cfg->starting_symbol;
+}
+
 // For debug use only
 void print(void* d, uint32_t size, uint32_t len, char* file_str)
 {

lib/src/phy/phch/prach_tables.h

@@ -434,3 +434,22 @@ srsran_prach_tdd_loc_table_t prach_tdd_loc_table[64][7] = {
      {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, 0, 0}}},
      {4, {{0, 0, 0, 0}, {1, 0, 0, 0}, {2, 0, 0, 0}, {3, 0, 0, 0}}}}};
+
+#define PRACH_NR_CFG_FR1_UNPAIRED_NOF_CFG 28
+
+// Table 6.3.3.2-3: Random access configurations for FR1 and unpaired spectrum.
+static const prach_nr_config_t prach_nr_cfg_fr1_unpaired[PRACH_NR_CFG_FR1_UNPAIRED_NOF_CFG] = {
+    {0, 16, 1, {9}, 1, 0},         {0, 8, 1, {9}, 1, 0},
+    {0, 4, 1, {9}, 1, 0},          {0, 2, 0, {9}, 1, 0},
+    {0, 2, 1, {9}, 1, 0},          {0, 2, 0, {4}, 1, 0},
+    {0, 2, 1, {4}, 1, 0},          {0, 1, 0, {9}, 1, 0},
+    {0, 1, 0, {8}, 1, 0},          {0, 1, 0, {7}, 1, 0},
+    {0, 1, 0, {6}, 1, 0},          {0, 1, 0, {5}, 1, 0},
+    {0, 1, 0, {4}, 1, 0},          {0, 1, 0, {3}, 1, 0},
+    {0, 1, 0, {2}, 1, 0},          {0, 1, 0, {1, 6}, 1, 0},
+    {0, 1, 0, {1, 6}, 1, 7},       {0, 1, 0, {4, 9}, 1, 0},
+    {0, 1, 0, {3, 8}, 1, 0},       {0, 1, 0, {2, 7}, 1, 0},
+    {0, 1, 0, {8, 9}, 1, 0},       {0, 1, 0, {4, 8, 9}, 1, 0},
+    {0, 1, 0, {3, 4, 9}, 1, 0},    {0, 1, 0, {7, 8, 9}, 1, 0},
+    {0, 1, 0, {3, 4, 8, 9}, 1, 0}, {0, 1, 0, {6, 7, 8, 9}, 1, 0},
+    {0, 1, 0, {1, 4, 6, 9}, 1, 0}, {0, 1, 0, {1, 3, 5, 7, 9}, 1, 0}};