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Compute and fill timing_advance field for SRS indication

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This commit is contained in:
Roberto Louro Magueta
2022-05-09 19:25:33 +01:00
parent bdff42cf77
commit 99b262d764
3 changed files with 48 additions and 1 deletions
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openair1/PHY/NR_ESTIMATION/nr_measurements_gNB.c
+43
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@@ -67,6 +67,49 @@ int nr_est_timing_advance_pusch(PHY_VARS_gNB* gNB, int UE_id)
return max_pos - sync_pos;
}
int nr_est_timing_advance_srs(NR_DL_FRAME_PARMS *frame_parms,
int32_t **srs_estimated_channel_time) {
int timing_advance = 0;
int max_val = 0;
for (int i = 0; i < frame_parms->ofdm_symbol_size; i++) {
int temp = 0;
for (int aa = 0; aa < frame_parms->nb_antennas_rx; aa++) {
int Re = ((int16_t*)srs_estimated_channel_time[aa])[(i<<1)];
int Im = ((int16_t*)srs_estimated_channel_time[aa])[1+(i<<1)];
temp += (Re*Re/2) + (Im*Im/2);
}
if (temp > max_val) {
timing_advance = i;
max_val = temp;
}
}
if (timing_advance > frame_parms->ofdm_symbol_size/2) {
timing_advance = timing_advance - frame_parms->ofdm_symbol_size;
}
// Scale the 16 factor in N_TA calculation in 38.213 section 4.2 according to the used FFT size
uint16_t bw_scaling = frame_parms->ofdm_symbol_size >> 11;
// do some integer rounding to improve TA accuracy
int sync_pos_rounded;
if (timing_advance > 0) {
sync_pos_rounded = timing_advance + (bw_scaling >> 1) - 1;
} else {
sync_pos_rounded = timing_advance - (bw_scaling >> 1) + 1;
}
int timing_advance_update = sync_pos_rounded / bw_scaling;
// put timing advance command in 0..63 range
timing_advance_update += 31;
if (timing_advance_update < 0) timing_advance_update = 0;
if (timing_advance_update > 63) timing_advance_update = 63;
return timing_advance_update;
}
void dump_nr_I0_stats(FILE *fd,PHY_VARS_gNB *gNB) {
openair1/PHY/NR_ESTIMATION/nr_ul_estimation.h
+3
View File
@@ -55,6 +55,9 @@ void nr_gnb_measurements(PHY_VARS_gNB *gNB, uint8_t ulsch_id, unsigned char harq
int nr_est_timing_advance_pusch(PHY_VARS_gNB* phy_vars_gNB, int UE_id);
int nr_est_timing_advance_srs(NR_DL_FRAME_PARMS *frame_parms,
int32_t **srs_estimated_channel_time);
void nr_pusch_ptrs_processing(PHY_VARS_gNB *gNB,
NR_DL_FRAME_PARMS *frame_parms,
nfapi_nr_pusch_pdu_t *rel15_ul,
openair1/SCHED_NR/phy_procedures_nr_gNB.c
+2 -1
View File
@@ -877,7 +877,7 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx) {
gNB->UL_INFO.srs_ind.slot = slot_rx;
gNB->srs_pdu_list[num_srs].handle = srs_pdu->handle;
gNB->srs_pdu_list[num_srs].rnti = srs_pdu->rnti;
//gNB->srs_pdu_list[num_srs].timing_advance;
gNB->srs_pdu_list[num_srs].timing_advance = nr_est_timing_advance_srs(&gNB->frame_parms, gNB->nr_srs_info[i]->srs_estimated_channel_time);
gNB->srs_pdu_list[num_srs].num_symbols = 1<<srs_pdu->num_symbols;
gNB->srs_pdu_list[num_srs].wide_band_snr = (*gNB->nr_srs_info[i]->snr + 64)<<1;
gNB->srs_pdu_list[num_srs].num_reported_symbols = 1<<srs_pdu->num_symbols;
@@ -895,6 +895,7 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx) {
LOG_I(NR_PHY, "gNB->UL_INFO.srs_ind.sfn = %i\n", gNB->UL_INFO.srs_ind.sfn);
LOG_I(NR_PHY, "gNB->UL_INFO.srs_ind.slot = %i\n", gNB->UL_INFO.srs_ind.slot);
LOG_I(NR_PHY, "gNB->srs_pdu_list[%i].rnti = 0x%04x\n", num_srs, gNB->srs_pdu_list[num_srs].rnti);
LOG_I(NR_PHY, "gNB->srs_pdu_list[%i].timing_advance = %i\n", num_srs, gNB->srs_pdu_list[num_srs].timing_advance);
LOG_I(NR_PHY, "gNB->srs_pdu_list[%i].num_symbols = %i\n", num_srs, gNB->srs_pdu_list[num_srs].num_symbols);
LOG_I(NR_PHY, "gNB->srs_pdu_list[%i].wide_band_snr = %i\n", num_srs, gNB->srs_pdu_list[num_srs].wide_band_snr);
LOG_I(NR_PHY, "gNB->srs_pdu_list[%i].num_reported_symbols = %i\n", num_srs, gNB->srs_pdu_list[num_srs].num_reported_symbols);