Add CI test for SRS in nr_ulsim

cmake_targets/autotests/test_case_list.xml

@@ -387,7 +387,8 @@
                                  (Test10: PUSCH Type B, 3 DMRS, 2 PTRS, 3 Interpolated Symbols),
                                  (Test11: 25 PRBs, 15 kHz SCS),
                                  (Test12: MCS 0, low SNR performance)
-                                 (Test13: MCS 28, 106 PRBs, Time shift 8)</desc>
+                                 (Test13: MCS 28, 106 PRBs, Time shift 8)
+                                 (Test14: SRS, SNR 40 dB)</desc>
       <main_exec>nr_ulsim</main_exec>
       <main_exec_args>-n100 -m9 -r106 -s5
                       -n100 -m16 -s10
@@ -401,8 +402,9 @@
                       -n100 -s5 -a4 -b8 -T 1,2 -U 1,3,1,1
                       -n100 -u0 -m0 -R25 -r25 -i 1,0
                       -n100 -m0 -S -0.6 -i 1,0
-                      -n100 -m 28 -R106 -r106 -t90 -s24 -S24 -d 8</main_exec_args>
-      <tags>test1 test2 test3 test4 test5 test6 test7 test8 test9 test10 test11 test12 test13</tags>
+                      -n100 -m 28 -R106 -r106 -t90 -s24 -S24 -d 8
+                      -n100 -s40 -E 1</main_exec_args>
+      <tags>test1 test2 test3 test4 test5 test6 test7 test8 test9 test10 test11 test12 test13 test14</tags>
       <search_expr_true>PUSCH test OK</search_expr_true>
       <search_expr_false>segmentation fault|assertion|exiting|fatal</search_expr_false>
       <nruns>3</nruns>

openair1/PHY/defs_gNB.h

@@ -258,6 +258,8 @@ typedef struct {
   uint32_t frame;
   /// Slot where current SRS pdu was received
   uint32_t slot;
+  /// Measured SNR
+  int8_t snr;
   /// ULSCH PDU
   nfapi_nr_srs_pdu_t srs_pdu;
 } NR_gNB_SRS_t;

openair1/SCHED_NR/phy_procedures_nr_gNB.c

@@ -936,7 +936,6 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
         int32_t srs_estimated_channel_time[frame_parms->nb_antennas_rx][1 << srs_pdu->num_ant_ports][frame_parms->ofdm_symbol_size] __attribute__((aligned(32)));
         int32_t srs_estimated_channel_time_shifted[frame_parms->nb_antennas_rx][1 << srs_pdu->num_ant_ports][frame_parms->ofdm_symbol_size];
         int8_t snr_per_rb[srs_pdu->bwp_size];
-        int8_t snr = 0;
 
         start_meas(&gNB->generate_srs_stats);
         if (check_srs_pdu(srs_pdu, &gNB->nr_srs_info[i]->srs_pdu) == 0) {
@@ -961,11 +960,11 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
                                     srs_estimated_channel_time,
                                     srs_estimated_channel_time_shifted,
                                     snr_per_rb,
-                                    &snr);
+                                    &gNB->srs->snr);
           stop_meas(&gNB->srs_channel_estimation_stats);
         }
 
-        if ((snr * 10) < gNB->srs_thres) {
+        if ((gNB->srs->snr * 10) < gNB->srs_thres) {
           srs_est = -1;
         }
 
@@ -1038,7 +1037,7 @@ int phy_procedures_gNB_uespec_RX(PHY_VARS_gNB *gNB, int frame_rx, int slot_rx)
             nfapi_nr_srs_beamforming_report_t nr_srs_bf_report;
             nr_srs_bf_report.prg_size = srs_pdu->beamforming.prg_size;
             nr_srs_bf_report.num_symbols = 1 << srs_pdu->num_symbols;
-            nr_srs_bf_report.wide_band_snr = srs_est >= 0 ? (snr + 64) << 1 : 0xFF; // 0xFF will be set if this field is invalid
+            nr_srs_bf_report.wide_band_snr = srs_est >= 0 ? (gNB->srs->snr + 64) << 1 : 0xFF; // 0xFF will be set if this field is invalid
             nr_srs_bf_report.num_reported_symbols = 1 << srs_pdu->num_symbols;
             fill_srs_reported_symbol_list(&nr_srs_bf_report.prgs, srs_pdu, frame_parms->N_RB_UL, snr_per_rb, srs_est);
 

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -936,6 +936,7 @@ int main(int argc, char *argv[])
   }
   //---------------
   int ret = 1;
+  int srs_ret = do_SRS;
   for (SNR = snr0; SNR <= snr1; SNR += snr_step) {
 
     varArray_t *table_rx=initVarArray(1000,sizeof(double));
@@ -971,6 +972,9 @@ int main(int argc, char *argv[])
     int max_pusch_delay = INT_MIN;
     int delay_pusch_est_count = 0;
 
+    int64_t sum_srs_snr = 0;
+    int srs_snr_count = 0;
+
     for (trial = 0; trial < n_trials; trial++) {
 
       uint8_t round = 0;
@@ -1436,6 +1440,10 @@ int main(int argc, char *argv[])
       max_pusch_delay = max(ulsch_gNB->delay.est_delay, max_pusch_delay);
       delay_pusch_est_count++;
 
+      if (do_SRS == 1) {
+        sum_srs_snr += gNB->srs->snr;
+        srs_snr_count++;
+      }
     } // trial loop
 
     roundStats/=((float)n_trials);
@@ -1471,8 +1479,14 @@ int main(int argc, char *argv[])
 
     printf(") Avg round %.2f, Eff Rate %.4f bits/slot, Eff Throughput %.2f, TBS %u bits/slot\n", roundStats,effRate,effTP,TBS);
 
-    printf("DMRS-PUSCH delay estimation: min %i, max %i, average %f\n",
-           min_pusch_delay >> 1, max_pusch_delay >> 1, (double)sum_pusch_delay / (2 * delay_pusch_est_count));
+    double av_delay = (double)sum_pusch_delay / (2 * delay_pusch_est_count);
+    printf("DMRS-PUSCH delay estimation: min %i, max %i, average %2.1f\n", min_pusch_delay >> 1, max_pusch_delay >> 1, av_delay);
+
+    if (do_SRS == 1) {
+      float srs_snr_av = (float)sum_srs_snr / srs_snr_count;
+      srs_ret = srs_snr_av >= 0.7 * SNR || srs_snr_av > 30 ? 0 : 1;
+      printf("SNR based on SRS: %2.1f dB\n", srs_snr_av);
+    }
 
     printf("*****************************************\n");
     printf("\n");
@@ -1519,7 +1533,7 @@ int main(int argc, char *argv[])
     if(n_trials==1)
       break;
 
-    if ((float)effTP >= eff_tp_check) {
+    if (srs_ret == 0 && (float)effTP >= eff_tp_check) {
       printf("*************\n");
       printf("PUSCH test OK\n");
       printf("*************\n");