Implemented NR SS raster object

master
Xavier Arteaga 4 years ago committed by Xavier Arteaga
parent 157af40417
commit 9621cf57c2

@ -68,6 +68,35 @@ public:
*/
srsran_duplex_mode_t get_duplex_mode(uint16_t band) const;
struct sync_raster_t {
protected:
sync_raster_t(uint32_t f, uint32_t s, uint32_t l) : first(f), step(s), last(l), gscn(f) {}
uint32_t gscn;
private:
uint32_t first;
uint32_t step;
uint32_t last;
public:
bool valid() const { return step != 0; }
void next()
{
if (gscn <= last) {
gscn += step;
}
}
bool end() const { return (gscn > last or step == 0); }
void reset() { gscn = first; }
double get_frequency() const;
};
sync_raster_t get_sync_raster(uint16_t band, srsran_subcarrier_spacing_t scs) const;
private:
// Elements of TS 38.101-1 Table 5.2-1: NR operating bands in FR1
struct nr_operating_band {
@ -225,7 +254,7 @@ private:
{261, KHZ_120, 2070833, 2, 2084999, 2070833, 2, 2084999}
}};
// Elements of TS 38.101-1 Table 5.4.3.3-1 : Applicable SS raster entries per operating band
// Elements of TS 38.101-1 Table 5.4.3.3-1 : Applicable SS raster entries per operating band
struct nr_band_ss_raster {
uint16_t band;
srsran_subcarrier_spacing_t scs;
@ -270,4 +299,4 @@ private:
} // namespace srsran
#endif // SRSRAN_BAND_HELPER_H
#endif // SRSRAN_BAND_HELPER_H

@ -12,6 +12,7 @@
#include "srsran/common/band_helper.h"
#include <algorithm>
#include <cmath>
namespace srsran {
@ -104,6 +105,59 @@ srsran_duplex_mode_t srsran_band_helper::get_duplex_mode(uint16_t band) const
return SRSRAN_DUPLEX_MODE_INVALID;
}
struct sync_raster_impl : public srsran_band_helper::sync_raster_t {
public:
sync_raster_impl(uint32_t f, uint32_t s, uint32_t l) : sync_raster_t(f, s, l)
{
// Do nothing
}
};
double srsran_band_helper::sync_raster_t::get_frequency() const
{
// Row 1
if (gscn >= 2 and gscn <= 7498) {
double N = std::ceil((gscn - 1) / 3.0);
double M = (gscn - 3 * N) / 2.0 + 3.0;
return N * 1200e3 + M * 50e3;
}
// Row 2
if (gscn >= 7499 and gscn <= 22255) {
double N = gscn - 7499;
return 3000e6 + N * 1.44e6;
}
// Row 3
if (gscn >= 22256 and gscn <= 26639) {
double N = gscn - 22256;
return 2425.08e6 + N * 17.28e6;
}
// Unhandled case
return NAN;
}
srsran_band_helper::sync_raster_t srsran_band_helper::get_sync_raster(uint16_t band,
srsran_subcarrier_spacing_t scs) const
{
// Look for the given band and SCS
for (const nr_band_ss_raster& ss_raster : nr_band_ss_raster_table) {
// Check if band and SCS match!
if (ss_raster.band == band && ss_raster.scs == scs) {
return sync_raster_impl(ss_raster.gscn_first, ss_raster.gscn_step, ss_raster.gscn_last);
}
// As bands are in ascending order, do not waste more time if the current band is bigger
if (ss_raster.band > band) {
return sync_raster_impl(0, 0, 0);
}
}
// Band is out of range, so consider invalid
return sync_raster_impl(0, 0, 0);
}
srsran_band_helper::nr_raster_params srsran_band_helper::get_raster_params(uint32_t nr_arfcn)
{
for (auto& fr : nr_fr_params) {
@ -114,4 +168,4 @@ srsran_band_helper::nr_raster_params srsran_band_helper::get_raster_params(uint3
return {}; // return empty params
}
} // namespace srsran
} // namespace srsran

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